styles.css

/* Google Fonts - Poppins and Montserrat for a professional look */
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Montserrat:wght@400;500;600;700&display=swap");

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Theme Variables - Light Theme (Default) */
:root {
  --primary-color: #007bff;
  --primary-light: #66b0ff;
  --primary-dark: #002b5e;
  --secondary-color: #00b4cc;
  --accent-color: #00b7eb;
  --text-color: #2a2a2a;
  --text-light: #6b7280;
  --text-dark: #1a1a1a;
  --light-text: #ffffff;
  --dark-bg: #2d3748;
  --light-bg: #f8f9fa;
  --main-bg: #ffffff;
  --border-color: #d1d5db;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 10px 20px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-slow: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
  --card-bg: #fafafa;
  --header-bg: rgba(255, 255, 255, 0.95);
  --header-scrolled: rgba(255, 255, 255, 0.98);
  --footer-text: #ffffff;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-sm: 4px;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-color: #5a9bff;
  --primary-light: #8cb4ff;
  --primary-dark: #004080;
  --secondary-color: #3a7bd5;
  --accent-color: #00b7eb;
  --text-color: #e0e0e0;
  --text-light: #b0b0b0;
  --text-dark: #99a3ff;
  --light-text: #f5f5f5;
  --dark-bg: #2a2a2a;
  --light-bg: #3c3c3c;
  --main-bg: #121212;
  --border-color: #404040;
  --success-color: #2ecc71;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 10px 20px rgba(0, 0, 0, 0.5);
  --card-bg: #252525;
  --header-bg: rgba(18, 18, 18, 0.9);
  --header-scrolled: rgba(18, 18, 18, 0.95);
  --footer-text: #d0d0d0;
}

/* Base HTML and Body Styles */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Poppins", sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--main-bg);
  transition: background-color 0.5s ease, color 0.5s ease;
  overflow-x: hidden;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Links */
a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

/* Lists */
ul {
  list-style: none;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Logo container */
.logo {
  flex: 0 0 auto;
  /* Prevent logo from growing */
}

/* Logo image */
.logo-img {
  width: 100%;
  max-width: 200px;
  /* Smaller base size to fit navbar */
  height: 55px;
  /* Maintain aspect ratio (400/295 ≈ 1.36) */
  display: block;
}

/* Tablets (up to 768px) */
@media (max-width: 768px) {
  .logo-img {
    max-width: 150px;
    /* Smaller for tablets */
  }

}

/* Mobile phones (up to 480px) */
@media (max-width: 480px) {
  .logo-img {
    max-width: 120px;
    /* Smaller for mobile */
  }

}

/* Very small devices (up to 320px) */
@media (max-width: 320px) {
  .logo-img {
    max-width: 100px;
    /* Smallest size for tiny screens */
  }
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Montserrat", sans-serif;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-color);
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  padding-bottom: 1.5rem;
  color: var(--text-dark);
  font-weight: 700;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--border-radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  font-size: 1rem;
  letter-spacing: 0.5px;
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--light-text);
  box-shadow: 0 4px 15px rgba(0, 86, 179, 0.3);
}

.primary-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 86, 179, 0.4);
}

.primary-btn:active {
  transform: translateY(-1px);
}

.secondary-btn {
  background-color: var(--secondary-color);
  color: var(--light-text);
  border: 2px solid var(--primary-color);
  box-shadow: 0 4px 15px rgba(0, 86, 179, 0.1);
}

.secondary-btn:hover {
  background-color: var(--primary-color);
  color: var(--light-text);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 86, 179, 0.3);
}

.secondary-btn:active {
  transform: translateY(-1px);
}

/* Button Ripple Effect */
.btn::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  z-index: -1;
  transition: width 0.6s ease-out, height 0.6s ease-out, opacity 0.6s ease-out;
}

.btn:hover::after {
  width: 300px;
  height: 300px;
  opacity: 1;
}

/* Header Styles */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--header-bg);
  box-shadow: var(--shadow);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  backdrop-filter: blur(10px);
}

header.scrolled {
  padding: 0.7rem 2rem;
  background-color: var(--header-scrolled);
  box-shadow: var(--shadow-lg);
}

/* Navigation */
nav ul {
  display: flex;
}

nav ul li {
  margin-left: 2.5rem;
}

nav ul li a {
  font-weight: 500;
  position: relative;
  padding-bottom: 5px;
  color: var(--text-color);
  transition: color 0.3s ease;
}

nav ul li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transition: width 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--primary-color);
}

nav ul li a:hover::after,
nav ul li a.active::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--primary-color);
  transition: var(--transition);
  background: none;
  border: none;
  padding: 0.5rem;
}

.menu-toggle.open .fa-bars {
  display: none;
}

.menu-toggle.open .fa-times {
  display: block;
}

.menu-toggle .fa-times {
  display: none;
}


.menu-toggle:hover {
  transform: scale(1.1);
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  margin-left: 1rem;
  color: var(--primary-color);
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: var(--transition);
  background-color: transparent;
}

.theme-toggle:hover {
  background-color: rgba(var(--rgb-primary-color), 0.1);
  /* Use var for color */
  transform: rotate(15deg);
}

.theme-toggle .fa-sun,
.theme-toggle .fa-moon {
  position: absolute;
  transition: transform 0.5s ease, opacity 0.5s ease;
}

.theme-toggle .fa-sun {
  transform: rotate(180deg) scale(0.5);
  opacity: 0;
}

.theme-toggle .fa-moon {
  transform: rotate(0) scale(1);
  opacity: 1;
}

[data-theme="dark"] .theme-toggle .fa-sun {
  transform: rotate(0) scale(1);
  opacity: 1;
}

[data-theme="dark"] .theme-toggle .fa-moon {
  transform: rotate(-180deg) scale(0.5);
  opacity: 0;
}

/* === HERO SECTION STYLES === */
.hero {
  height: 100vh;
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("Images/background-image.png") no-repeat center center / cover;
  /* YOUR BACKGROUND IMAGE */
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--light-text, #ffffff);
  padding-top: 100px;
  /* Increased slightly for more space from header */
  padding-bottom: 80px;
  /* Space for scroll arrow */
  position: relative;
  overflow: hidden;
  /* Important for overlays and animations */
}

.hero::before {
  /* Radial Gradient Overlay */
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.2) 0%, rgba(0, 0, 0, 0.6) 100%);
  /* Softened */
  z-index: 1;
}

.hero::after {
  /* Animated Gradient Overlay */
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, rgba(0, 86, 179, 0.15) 0%, rgba(0, 160, 233, 0.15) 50%, rgba(0, 86, 179, 0.15) 100%);
  /* Softened opacity */
  background-size: 200% 200%;
  animation: gradientAnimation 15s ease infinite;
  z-index: 2;
  opacity: 0.5;
  /* Reduced opacity slightly */
}

@keyframes gradientAnimation {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

/* Main content area within the hero */
.hero-content.container {
  /* Assuming .container provides max-width and margin: auto */
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 3;
  /* Above overlays */
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  /* Increased gap slightly */
}

/* Text content column */
.hero-text-column {
  flex: 1 1 58%;
  /* Text takes more space */
  text-align: left;
  /* Animations for individual elements as per your original CSS */
}

.hero-text-column h2 {
  /* "Welcome To My Website" */
  font-size: 1.6rem;
  /* Slightly larger subtitle */
  font-weight: 400;
  /* Lighter weight for subtitle */
  margin-bottom: 0.75rem;
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.2s forwards;
  color: rgba(255, 255, 255, 0.85);
  /* Brighter subtitle */
  letter-spacing: 0.5px;
}

.hero-text-column h1 {
  /* "I'm Amrit Khanal" */
  font-size: clamp(3rem, 7vw, 4.5rem);
  /* Responsive sizing */
  margin-bottom: 0.75rem;
  /* Closer to profession */
  font-weight: 700;
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.4s forwards;
  text-shadow: 0 3px 12px rgba(0, 0, 0, 0.35);
  /* Enhanced shadow */
  color: var(--light-text, #ffffff);
  line-height: 1.15;
}

.hero-text-column h3 {
  /* "Chemical Engineer" */
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  /* Responsive sizing */
  margin-bottom: 1.8rem;
  /* More space before tagline */
  font-weight: 500;
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.6s forwards;
  color: var(--accent-color, #00BFFF);
  /* Bright accent color, e.g., DeepSkyBlue */
  letter-spacing: 0.5px;
}

.hero-text-column .hero-tagline {
  font-size: 1.2rem;
  /* Slightly smaller for balance */
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.8s forwards;
  line-height: 1.7;
  /* Improved readability */
  color: rgba(255, 255, 255, 0.75);
  /* Slightly less prominent */
  max-width: 550px;
  /* Constrain width for readability */
}

.hero-text-column .hero-buttons {
  display: flex;
  justify-content: flex-start;
  gap: 1rem;
  /* Reduced gap slightly for a tighter look */
  opacity: 0;
  margin-top: -1rem;
  animation: fadeInUp 1s ease-out 1s forwards;
  flex-wrap: wrap;
  /* Allow buttons to wrap */
}

.hero-buttons .btn {
  padding: 0.8rem 1.8rem;
  font-size: 0.9rem;
  border-radius: 25px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}

.hero-buttons .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}


/* === STYLES FOR THE CIRCULAR GLOWING PROFILE IMAGE === */
.profile-image {
  flex: 0 0 auto;
  position: relative;
  width: 260px;
  height: 260px;
  padding: 8px;
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(120, 120, 180, 0.15), rgba(180, 120, 220, 0.15));
  box-shadow:
    /* Glow effect adjusted for dark background */
    0 0 20px rgba(180, 150, 255, 0.4),
    /* Inner, more defined glow */
    0 0 40px rgba(200, 180, 255, 0.3),
    /* Middle glow */
    0 0 70px rgba(220, 200, 255, 0.2),
    /* Outer, faintest glow */
    inset 0 0 10px rgba(255, 255, 255, 0.05);
  /* Subtle inner highlight on the padded area */
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  animation: fadeInUp 1s ease-out 0.7s forwards;
  /* Match text animation style */
  /* margin-left: auto; /* Let flexbox handle spacing with justify-content */
}

/* Optional: Outer decorative ring */
.profile-image::before {
  content: '';
  position: absolute;
  top: -5px;
  left: -5px;
  right: -5px;
  bottom: -5px;
  border-radius: 50%;
  border: 1.5px solid rgba(200, 180, 255, 0.25);
  /* Fainter ring */
  z-index: -1;
  /* Behind the main padded area */
  opacity: 0.6;
}

.profile-img {
  /* The <img> tag */
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  /* Adding a very subtle inner shadow on the image itself for a bit of depth */
  box-shadow: inset 0px 0px 15px rgba(0, 0, 0, 0.3);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll down arrow */
.scroll-down {
  position: absolute;
  bottom: 30px;
  /* Raised slightly */
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  opacity: 0;
  animation: fadeInUp 1.2s ease-out 1.4s forwards;
  /* Delayed more */
}

.scroll-down a {
  color: var(--light-text, #fff);
  font-size: 1.6rem;
  background-color: rgba(0, 0, 0, 0.25);
  /* Darker circle for arrow */
  border-radius: 50%;
  width: 45px;
  /* Defined size */
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.scroll-down a:hover {
  transform: translateY(3px);
  background-color: rgba(0, 0, 0, 0.4);
}


/* === RESPONSIVE ADJUSTMENTS FOR HERO SECTION === */
@media (max-width: 992px) {

  /* Tablet */
  .hero {
    padding-top: 80px;
    min-height: auto;
    /* Let content define height */
    padding-bottom: 60px;
  }

  .hero-content {
    flex-direction: column;
    align-items: center;
    /* Center items when stacked */
    text-align: center;
    gap: 2rem;
    /* Consistent gap */
  }

  .hero-text-column {
    order: 2;
    /* Text below image */
    text-align: center;
    flex-basis: auto;
    width: 100%;
    max-width: 580px;
    /* Max width for text block on tablet */
  }

  .hero-text-column .hero-buttons {
    justify-content: center;
  }

  .profile-image {
    order: 1;
    /* Image above text */
    width: 220px;
    height: 220px;
    margin-bottom: 2rem;
    /* Space between image and text */
    flex-basis: auto;
    box-shadow:
      0 0 15px rgba(180, 150, 255, 0.4),
      0 0 30px rgba(200, 180, 255, 0.3),
      0 0 50px rgba(220, 200, 255, 0.2);
  }
}

.diagram-note {
  color: #2ecc71;
  /* A nice green color */
  font-size: 0.9rem;
  /* Adjust as needed */
  font-style: italic;
  margin-top: 1rem;
  /* Example spacing */
  margin-bottom: 1rem;
  text-align: center;
}

.diagram-note .highlight {
  font-weight: bold;
  color: #27ae60;
}

@media (max-width: 576px) {

  /* Mobile phones */
  .hero {
    padding-top: 70px;
    padding-bottom: 70px;
    /* More bottom padding for scroll arrow */
  }

  .hero-text-column h1 {
    font-size: clamp(2.2rem, 9vw, 2.8rem);
  }

  .hero-text-column h2 {
    font-size: 1.2rem;
  }

  .hero-text-column h3 {
    font-size: clamp(1.5rem, 7vw, 1.8rem);
    margin-bottom: 1.5rem;
  }

  .hero-text-column .hero-tagline {
    font-size: 1rem;
    margin-bottom: 2rem;
  }

  .hero-text-column .hero-buttons {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-top: -1.5rem;
  }

  .hero-text-column .hero-buttons .btn {
    width: 90%;
    max-width: 280px;
  }

  .profile-image {
    width: 180px;
    height: 180px;
    padding: 6px;
    margin-bottom: 1.5rem;
    box-shadow:
      0 0 12px rgba(180, 150, 255, 0.45),
      0 0 25px rgba(200, 180, 255, 0.3),
      0 0 40px rgba(220, 200, 255, 0.2);
  }

  .profile-image::before {
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
  }

  .scroll-down {
    bottom: 25px;
  }

  .scroll-down a {
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
  }
}

/* Scroll Down Arrow */
.scroll-down {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2.5s infinite;
  z-index: 3;
  opacity: 0;
  animation: fadeIn 1s ease-out 1.5s forwards, bounce 2.5s infinite 1.5s;
}

.scroll-down a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background-color: rgba(255, 255, 255, 0.15);
  color: white;
  border-radius: 50%;
  font-size: 1.5rem;
  transition: var(--transition);
  backdrop-filter: blur(5px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.scroll-down a:hover {
  background-color: var(--primary-color);
  transform: translateY(-5px);
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0) translateX(-50%);
  }

  40% {
    transform: translateY(-20px) translateX(-50%);
  }

  60% {
    transform: translateY(-10px) translateX(-50%);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* About Section */
section#about.about {
  padding: 4rem 0;
  background-color: var(--light-bg);
}

section#about.about .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

section#about.about .section-title {
  font-size: 2rem;
  font-weight: bold;
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 2rem;
  text-transform: uppercase;
}

section#about.about .about-content {
  display: flex;
  gap: 20px;
}

section#about.about .main-content {
  flex: 1;
  background: var(--card-bg);
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

section#about.about .profile-section {
  display: flex;
  gap: 20px;
}

section#about.about .profile-image {
  flex: 0 0 150px;
}

section#about.about .profile-img {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow);
}

section#about.about .bio-text {
  flex: 1;
}

section#about.about .bio-text h3 {
  font-size: 1.5rem;
  font-weight: 600;
  text-align: left;
  color: rgb(7, 22, 233);
  margin-bottom: 10px;
  text-transform: uppercase;
}

section#about.about .bio-text p {
  font-size: 1rem;
  color: var(--text-color);
  line-height: 1.6;
  margin-bottom: 10px;
  text-align: justify;
  font-style: italic;
  margin-left: 15px;
  margin-right: 15px;
}

section#about.about .sidebar {
  flex: 0 0 325px;
  background: var(--card-bg);
  padding: 10px;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

section#about.about .education {
  display: flex;
  flex-direction: column;
  gap: 1px;
  position: relative;
}

section#about.about .education::before {
  content: "";
  position: absolute;
  top: 15px;
  left: 10px;
  width: 2px;
  height: calc(100% - 30px);
  background: var(--border-color);
}

section#about.about .edu-item {
  display: flex;
  align-items: flex-start;
  gap: 1px;
  position: relative;
}

section#about.about .edu-icon {
  font-size: 1.2rem;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--light-bg);
  border-radius: 50%;
  color: var(--text-light);
  z-index: 1;
}

section#about.about .edu-item div {
  flex: 1;
}

section#about.about .edu-item strong {
  font-weight: 400;
  color: var(--text-color);
  font-size: 0.9rem;
  display: block;
  margin-bottom: 5px;
}

section#about.about .edu-item p {
  font-size: 0.9rem;
  color: var(--text-color);
  line-height: 1.4;
  text-align: left;
}

section#about.about .edu-item p:first-line {
  font-weight: bold;
  font-size: 1rem;
  text-align: justify;
}

/* Skills Section */
.skills-overview {
  margin-top: 10px;
  background-color: white;
  padding: 10px;
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.skills-overview h3 {
  font-size: 1.1em;
  margin-bottom: 8px;
  color: var(--text-dark);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 4px;
}

.skills-logo-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.skills-logo-list li {
  display: inline-flex;
}

.skills-logo-list li img {
  height: 40px;
  object-fit: contain;
  vertical-align: middle;
}

.skills-logo-list li img:hover {
  opacity: 0.8;
  transform: scale(1.1);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

/* Specific styling for skills-item */
section#about.about .edu-item.skills-item .skills-overview {
  margin-top: 5px;
  padding: 16px;
}

section#about.about .edu-item.skills-item .skills-logo-list {
  gap: 8px;
}

section#about.about .edu-item.skills-item .skills-logo-list li img {
  height: 43px;
}

/* Educational Content Section */
.educational-content {
  padding: 8rem 0;
  background-color: var(--main-bg);
  position: relative;
  overflow: hidden;
}

.educational-content::before {
  content: "";
  position: absolute;
  top: 50px;
  left: -100px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 86, 179, 0.05), rgba(0, 160, 233, 0.05));
  z-index: 0;
}

.educational-content::after {
  content: "";
  position: absolute;
  bottom: 100px;
  right: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 160, 233, 0.05), rgba(0, 86, 179, 0.05));
  z-index: 0;
}

.content-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-bottom: 4rem;
  position: relative;
  z-index: 1;
}

.category-item {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-slow);
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.category-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: translateY(-100%);
  transition: var(--transition);
}

.category-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
}

.category-item:hover::before {
  transform: translateY(0);
}

.category-item.active {
  border-color: var(--primary-color);
  background-color: rgba(0, 86, 179, 0.05);
  transform: translateY(-5px);
}

.category-item.active::before {
  transform: translateY(0);
}

.folder-icon {
  font-size: 2.8rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.text-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  line-height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 1.5rem;
  transition: var(--transition);
  box-shadow: 0 5px 15px rgba(0, 86, 179, 0.3);
}

.category-item:hover .folder-icon {
  transform: scale(1.2);
  color: var(--accent-color);
}

.category-item:hover .text-icon {
  transform: scale(1.1) rotate(10deg);
}

.category-item h3 {
  font-size: 1.3rem;
  color: var(--text-color);
  margin-bottom: 0.5rem;
  transition: var(--transition);
}

.category-item:hover h3 {
  color: var(--primary-color);
}

.folder-arrow {
  position: absolute;
  bottom: 15px;
  right: 15px;
  color: var(--primary-color);
  transition: transform 0.4s ease, color 0.3s ease;
}

.category-item:hover .folder-arrow {
  color: var(--accent-color);
}

.category-item.active .folder-arrow i {
  transform: rotate(180deg);
}

.btn.folder-btn {
  display: block;
  margin-bottom: 10px;
  text-align: left;
}

/* Content Display Area */
.content-display-area {
  background-color: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
  margin-top: 3rem;
  min-height: 300px;
  position: relative;
  z-index: 1;
  transition: var(--transition);
}

.content-display-area:hover {
  box-shadow: var(--shadow-hover);
}

.content-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 250px;
  color: var(--text-light);
  opacity: 0.7;
  text-align: center;
  transition: var(--transition);
}

.content-placeholder i {
  font-size: 5rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 0.7;
  }

  50% {
    transform: scale(1.1);
    opacity: 1;
  }

  100% {
    transform: scale(1);
    opacity: 0.7;
  }
}

.content-placeholder p {
  font-size: 1.2rem;
}

.content-section {
  display: none;
  animation: fadeIn 0.6s ease;
}

.content-section h2 {
  font-size: 2.2rem;
  margin-bottom: 2.5rem;
  color: var(--primary-color);
  text-align: center;
  position: relative;
  padding-bottom: 1rem;
}

.content-section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 1.5px;
}

.book-grid,
.semester-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.5rem;
}

.book-item,
.semester-item,
.resource-item {
  background-color: var(--light-bg);
  border-radius: var(--border-radius);
  padding: 1.8rem;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
  border-left: 3px solid transparent;
}

.book-item::before,
.semester-item::before,
.resource-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 86, 179, 0.05), rgba(0, 160, 233, 0.05));
  opacity: 0;
  transition: var(--transition);
  z-index: 0;
}

.book-item:hover,
.semester-item:hover,
.resource-item:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-left: 3px solid var(--primary-color);
}

.book-item:hover::before,
.semester-item:hover::before,
.resource-item:hover::before {
  opacity: 1;
}

.book-item h3,
.semester-item h3,
.resource-item h3 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--text-color);
  position: relative;
  z-index: 1;
}

.book-links,
.resource-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.view-btn,
.download-btn,
.folder-btn,
.youtube-btn {
  padding: 8px 16px;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
}

.view-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: 0 3px 10px rgba(0, 86, 179, 0.2);
}

.download-btn {
  background: linear-gradient(135deg, var(--success-color), #1a9635);
  color: white;
  box-shadow: 0 3px 10px rgba(40, 167, 69, 0.2);
}

.folder-btn {
  background: linear-gradient(135deg, var(--warning-color), #e0a800);
  color: var(--text-dark);
  box-shadow: 0 3px 10px rgba(255, 193, 7, 0.2);
}

.youtube-btn {
  background: linear-gradient(135deg, #ff0000, #cc0000);
  color: white;
  box-shadow: 0 3px 10px rgba(255, 0, 0, 0.2);
}

.view-btn:hover,
.download-btn:hover,
.folder-btn:hover,
.youtube-btn:hover {
  transform: translateY(-3px);
  opacity: 0.95;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Blog Section */
.blog-section-wrapper {
  padding: 5rem 0;
  /* Reduced padding */
  background-color: var(--light-bg);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .blog-section-wrapper {
  background-color: var(--dark-bg);
}

.blog-section-wrapper .container {
  position: relative;
  z-index: 1;
}

.blog-posts-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  /* Smaller minmax */
  gap: 2rem;
}

.blog-post-preview {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  /* Reduced padding */
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.blog-post-preview:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.blog-post-preview img.preview-image {
  width: 100%;
  height: 200px;
  /* Reduced height */
  object-fit: cover;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  transition: transform 0.4s ease;
}

.blog-post-preview:hover img.preview-image {
  transform: scale(1.03);
}

.blog-post-preview h3 {
  font-size: 1.3em;
  /* Slightly smaller */
  margin-bottom: 0.75rem;
  color: var(--text-dark);
  line-height: 1.4;
}

.blog-post-preview .snippet {
  font-size: 0.9em;
  /* Slightly smaller */
  color: var(--text-light);
  flex-grow: 1;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.blog-post-preview .actions {
  display: flex;
  gap: 0.8rem;
  margin-top: auto;
}

.blog-post-preview .actions .btn {
  flex-grow: 1;
  /* Buttons take equal width */
  padding: 8px 16px;
  font-size: 0.9rem;
}

/* Button Container */
.button-container {
  display: flex;
  justify-content: center;
  margin: 30px 0 20px;
  /* Increased top margin */
}

/* Toggle Button */
.toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 35px;
  height: 70px;
  min-width: 320px;
  max-width: 400px;
  width: auto;
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, #ffaf60, #ff8c00);
  color: #000000;
  border: none;
  border-radius: 35px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  text-align: center;
  box-shadow: 0 5px 10px rgba(255, 140, 0, 0.3),
    0 3px 6px rgba(0, 0, 0, 0.15),
    inset 0 -2px 2px rgba(0, 0, 0, 0.05);
  letter-spacing: 0.5px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.toggle-btn:hover {
  background: linear-gradient(135deg, #ffb770, #ff9933);
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 8px 16px rgba(255, 140, 0, 0.35),
    0 5px 10px rgba(0, 0, 0, 0.2),
    inset 0 -2px 2px rgba(0, 0, 0, 0.03);
}

/* Responsive Adjustments */
@media (max-width: 600px) {
  .toggle-btn {
    padding: 14px 20px;
    font-size: 1.5rem;
    /* Slightly smaller for mobile */
    width: 90%;
    max-width: 350px;
    height: 70px;
  }

  .toggle-btn::before {
    font-size: 2.2rem;
    margin-right: 10px;
  }

  .section-title {
    font-size: 2rem;
  }
}

/* Responsive Adjustments */
@media (max-width: 600px) {
  .toggle-btn {
    padding: 14px 40px;
    font-size: 1.7rem;
  }
}

/* Modal Styling */
.modal {
  position: fixed;
  top: 0;
  /* Corrected from 1050 */
  left: 0;
  z-index: 1050;
  /* Ensure it's on top */
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.65);
  /* Slightly less dark overlay */
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0s linear 0.3s;
  /* Visibility transition */
  display: flex;
  /* Use flex for centering */
  align-items: center;
  justify-content: center;
  visibility: hidden;
  /* Start hidden */
}

.modal[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
  /* Become visible */
  transition-delay: 0s;
  /* Remove delay for visibility */
}

.modal[aria-hidden="true"] {
  opacity: 0;
  visibility: hidden;
}

.modal-content {
  background-color: var(--card-bg);
  margin: 20px;
  /* Margin for spacing on small screens */
  padding: 0;
  border: 1px solid var(--border-color);
  height: 95vh;
  /* Full height for modal content */
  width: 90%;
  max-width: 900px;
  /* Slightly reduced max-width */
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 40px);
  /* Max height considering margin */
  position: relative;
  transform: translateY(-20px) scale(0.98);
  /* Initial transform */
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.3s ease;
  overflow: hidden;
  /* Clip content, body handles scroll */
}

.modal[aria-hidden="false"] .modal-content {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal-header {
  padding: 1rem 1.5rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--light-text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top-left-radius: var(--border-radius-lg);
  border-top-right-radius: var(--border-radius-lg);
  border-bottom: 1px solid var(--primary-dark);
  flex-shrink: 0;
  /* Prevent header from shrinking */
}

.modal-header h3 {
  margin: 0;
  font-size: 1.3em;
  font-weight: 600;
  color: var(--light-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.close-button {
  color: var(--light-text);
  font-size: 1.8rem;
  font-weight: 400;
  /* Slightly bolder X */
  opacity: 0.9;
  transition: var(--transition);
  background: transparent;
  border: none;
  padding: 0.25rem 0.5rem;
  /* Adjust padding */
  line-height: 1;
  cursor: pointer;
}

.close-button:hover,
.close-button:focus-visible {
  /* Use focus-visible */
  opacity: 1;
  transform: rotate(90deg) scale(1.1);
  outline: none;
  /* Custom focus below if needed */
}

.close-button:focus-visible {
  box-shadow: 0 0 0 2px var(--light-text);
  /* Example focus */
}


.modal-body {
  padding: 0;
  /* Iframe will fill this */
  flex-grow: 1;
  overflow: hidden;
  /* Iframe handles scroll */
  background-color: var(--card-bg);
  position: relative;
  /* For iframe absolutely positioned if needed */
}

#blogIframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  /* Remove any extra space below iframe */
}

.modal-footer {
  padding: 1rem 1.5rem;
  background-color: var(--light-bg);
  text-align: right;
  border-bottom-left-radius: var(--border-radius-lg);
  border-bottom-right-radius: var(--border-radius-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  flex-shrink: 0;
  /* Prevent footer from shrinking */
}

[data-theme="dark"] .modal-footer {
  background-color: var(--dark-bg);
}

.modal-footer .btn.modal-btn {
  /* Apply to buttons with .btn and .modal-btn */
  font-size: 0.9rem;
  padding: 8px 18px;
}

/* Contact Section */
section#contact.contact {
  padding: 6rem 0;
  background: linear-gradient(to bottom, var(--main-bg), var(--light-bg));
  position: relative;
  overflow: hidden;
}

section#contact.contact::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 86, 179, 0.05), rgba(0, 160, 233, 0.05));
  z-index: 0;
}

section#contact.contact::after {
  content: "";
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 160, 233, 0.05), rgba(0, 86, 179, 0.05));
  z-index: 0;
}

section#contact.contact .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

section#contact.contact .section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-color);
  text-align: center;
  margin-bottom: 3rem;
  text-transform: uppercase;
  position: relative;
}

section#contact.contact .section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 4px;
  background: var(--accent-color);
  border-radius: 2px;
}

section#contact.contact .contact-content {
  display: flex;
  gap: 2rem;
  align-items: stretch;
}

section#contact.contact .social-links {
  flex: 1;
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: var(--transition);
}

section#contact.contact .social-links:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

section#contact.contact .social-links h3 {
  font-size: 1.5rem;
  color: var(--text-color);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

section#contact.contact .social-icons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

section#contact.contact .social-icon {
  font-size: 1.8rem;
  color: #fff;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
  text-decoration: none;
}

section#contact.contact .social-icon:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-hover);
}

section#contact.contact .contact-form {
  flex: 2;
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

section#contact.contact .contact-form:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

section#contact.contact .form-group {
  margin-bottom: 1.5rem;
}

section#contact.contact .form-group label {
  display: block;
  font-size: 1rem;
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

section#contact.contact .form-group input,
section#contact.contact .form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  font-size: 1rem;
  color: var(--text-color);
  transition: var(--transition);
  background: var(--card-bg);
}

section#contact.contact .form-group input:focus,
section#contact.contact .form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 5px rgba(0, 86, 179, 0.3);
  background: var(--light-bg);
}

section#contact.contact .form-group textarea {
  resize: vertical;
  min-height: 100px;
}

section#contact.contact .submit-btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--light-text);
  border: none;
  border-radius: 5px;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  width: auto;
  align-self: flex-end;
}

section#contact.contact .submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

/* Footer */
footer {
  background: linear-gradient(to right, var(--dark-bg), #0a0a0a);
  color: var(--footer-text);
  padding: 5rem 0 1.5rem;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--primary-color));
  background-size: 200% 100%;
  animation: gradientMove 5s linear infinite;
}

@keyframes gradientMove {
  0% {
    background-position: 0% 0%;
  }

  100% {
    background-position: 200% 0%;
  }
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
  position: relative;
}

.footer-info h3,
.footer-contact h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.8rem;
  color: var(--light-text);
}

.footer-info h3::after,
.footer-contact h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 1.5px;
}

.footer-info p {
  margin-bottom: 1.5rem;
  color: var(--text-light);
  line-height: 1.8;
}

.social-icons {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.social-icon::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  opacity: 0;
  transition: var(--transition);
  z-index: 0;
}

.social-icon i {
  position: relative;
  z-index: 1;
}

.social-icon:hover {
  transform: translateY(-5px) rotate(10deg);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.4);
}

.social-icon:hover::before {
  opacity: 1;
}

.footer-contact p {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  color: var(--text-light);
}

.footer-contact p i {
  margin-right: 1rem;
  width: 20px;
  color: var(--primary-light);
}

.footer-message {
  margin: 1.5rem 0;
  line-height: 1.8;
  color: var(--text-light);
}

.contact-btn {
  margin-top: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-btn i {
  font-size: 0.9rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-light);
}

/* Scroll to Top */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: all 0.5s ease;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 45px;
  height: 45px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  border-radius: 50%;
  font-size: 1.2rem;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.scroll-top a:hover {
  transform: translateY(-5px);
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* About Section Specific Styles */
.about .container {
  max-width: 1200px;
  margin: 0 auto;
}

.about .about-content {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
}

.about .main-content {
  flex: 2;
  min-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 25px;
}

.distillation-column-wrapper {
  width: calc(700px * 0.9);
  height: calc(550px * 0.9);
  overflow: hidden;
  position: relative;
  border: 1px solid #ccc;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  margin-left: auto;
  margin-right: auto;
}

.distillation-diagram-container {
  position: relative;
  width: 700px;
  height: 550px;
  background-color: white;
  overflow: hidden;
  transform: scale(0.9);
  transform-origin: top left;
}

.distillation-diagram-container .label {
  position: absolute;
  font-size: 13px;
  color: black;
  white-space: nowrap;
  z-index: 20;
}

.distillation-diagram-container .column {
  position: absolute;
  left: 150px;
  top: 100px;
  width: 80px;
  height: 300px;
  background-color: #d3d3d3;
  border: 2px solid #555;
  border-radius: 40px;
  z-index: 5;
  box-shadow: inset 2px 2px 5px rgba(0, 0, 0, 0.2);
}

.distillation-diagram-container .column .tray {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #555;
}

.distillation-diagram-container .internal-arrow {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  transform: translateX(-50%);
}

.distillation-diagram-container .internal-arrow.liquid-arrow.down {
  border-width: 6px 4px 0 4px;
  border-color: blue transparent transparent transparent;
}

.distillation-diagram-container .internal-arrow.vapor-arrow.up {
  border-width: 0 4px 6px 4px;
  border-color: transparent transparent red transparent;
}

.distillation-diagram-container .condenser-symbol {
  position: absolute;
  left: 280px;
  top: 50px;
  width: 60px;
  height: 60px;
  z-index: 10;
}

.distillation-diagram-container .condenser-circle {
  position: absolute;
  top: 5px;
  left: 5px;
  width: 50px;
  height: 50px;
  border: 2px solid black;
  border-radius: 50%;
  background-color: #e9e9e9;
}

.distillation-diagram-container .condenser-zigzag-path {
  position: absolute;
  width: 20px;
  height: 10px;
  top: 25px;
  left: 20px;
}

.distillation-diagram-container .condenser-zigzag-path>.cz-segment {
  position: absolute;
  background-color: black;
  height: 2px;
  transform-origin: left center;
}

.distillation-diagram-container .condenser-arrow-diag {
  position: absolute;
  width: 45px;
  height: 2px;
  background-color: black;
  top: 30px;
  left: 7.5px;
  transform: translateY(-1px) rotate(-45deg);
  transform-origin: center center;
}

.distillation-diagram-container .condenser-arrow-diag-head {
  position: absolute;
  width: 0;
  height: 0;
  top: 6px;
  left: 42px;
  border-left: 8px solid black;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transform: rotate(-45deg);
  transform-origin: 0% 50%;
}

.distillation-diagram-container .reflux-drum {
  position: absolute;
  left: 400px;
  top: 100px;
  width: 120px;
  height: 60px;
  background-color: #d3d3d3;
  border: 2px solid #555;
  border-radius: 30px;
  overflow: hidden;
  z-index: 5;
  box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.distillation-diagram-container .reflux-drum .liquid-base {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 20px;
  background-color: #a0e0ff;
  z-index: 1;
}

.distillation-diagram-container .reflux-drum .liquid-hump {
  position: absolute;
  width: 50%;
  height: 15px;
  background-color: #a0e0ff;
  bottom: 20px;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 2;
}

.distillation-diagram-container .reflux-drum .hump1 {
  left: 0;
}

.distillation-diagram-container .reflux-drum .hump2 {
  left: 50%;
}

.distillation-diagram-container .reboiler {
  position: absolute;
  left: 250px;
  top: 430px;
  width: 150px;
  height: 70px;
  background-color: #d3d3d3;
  border: 2px solid #555;
  border-radius: 35px;
  overflow: hidden;
  z-index: 5;
  box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.distillation-diagram-container .reboiler .reboiler-liquid-base {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 40px;
  background-color: #a0e0ff;
  z-index: 1;
}

.distillation-diagram-container .heating-coil {
  position: absolute;
  bottom: 10px;
  left: 10px;
  width: calc(100% - 30px);
  height: 35px;
  z-index: 2;
}

.distillation-diagram-container .heating-coil .hc-tube {
  position: absolute;
  left: 0;
  height: 6px;
  background-color: #ff6347;
  border-radius: 3px 0 0 3px;
}

.distillation-diagram-container .heating-coil .hc-u-bend {
  position: absolute;
  right: 0px;
  width: 20px;
  height: 6px;
  background-color: #ff6347;
  border-radius: 0 3px 3px 0;
}

.distillation-diagram-container .bubble {
  position: absolute;
  bottom: 5px;
  width: 6px;
  height: 6px;
  background-color: white;
  border-radius: 50%;
  opacity: 0.8;
  animation: rise 2.5s infinite ease-in;
  z-index: 3;
  box-shadow: 0 0 2px white;
}

@keyframes rise {
  0% {
    transform: translateY(0) scale(0.8);
    opacity: 0.8;
  }

  50% {
    transform: translateY(-15px) scale(1);
    opacity: 0.6;
  }

  100% {
    transform: translateY(-35px) scale(0.9);
    opacity: 0;
  }
}

.distillation-diagram-container .pipe {
  position: absolute;
  z-index: 3;
}

.distillation-diagram-container .vapor-pipe {
  background-color: red;
}

.distillation-diagram-container .liquid-pipe {
  background-color: blue;
}

.distillation-diagram-container .pipe.animated-flow {
  background-size: 20px 20px;
}

.distillation-diagram-container .pipe.vapor-pipe.animated-flow {
  background-image: linear-gradient(45deg, rgba(255, 200, 200, 0.5) 25%, transparent 25%, transparent 50%, rgba(255, 200, 200, 0.5) 50%, rgba(255, 200, 200, 0.5) 75%, transparent 75%, transparent);
}

.distillation-diagram-container .pipe.liquid-pipe.animated-flow {
  background-image: linear-gradient(45deg, rgba(200, 200, 255, 0.5) 25%, transparent 25%, transparent 50%, rgba(200, 200, 255, 0.5) 50%, rgba(200, 200, 255, 0.5) 75%, transparent 75%, transparent);
}

.distillation-diagram-container .pipe.animated-flow:not(.vertical) {
  animation: flow_animation_horizontal 0.7s linear infinite;
}

.distillation-diagram-container .pipe.animated-flow.vertical {
  animation: flow_animation_vertical 0.7s linear infinite;
}

@keyframes flow_animation_horizontal {
  0% {
    background-position: 0 0;
  }

  100% {
    background-position: 20px 0;
  }
}

@keyframes flow_animation_vertical {
  0% {
    background-position: 0 0;
  }

  100% {
    background-position: 0 20px;
  }
}

.distillation-diagram-container .arrow {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  z-index: 4;
}

.distillation-diagram-container .arrow-up.vapor-arrow {
  border-width: 0 5px 8px 5px;
  border-color: transparent transparent red transparent;
}

.distillation-diagram-container .arrow-down.vapor-arrow {
  border-width: 8px 5px 0 5px;
  border-color: red transparent transparent transparent;
}

.distillation-diagram-container .arrow-left.vapor-arrow {
  border-width: 5px 8px 5px 0;
  border-color: transparent red transparent transparent;
}

.distillation-diagram-container .arrow-right.vapor-arrow {
  border-width: 5px 0 5px 8px;
  border-color: transparent transparent transparent red;
}

.distillation-diagram-container .arrow-up.liquid-arrow {
  border-width: 0 5px 8px 5px;
  border-color: transparent transparent blue transparent;
}

.distillation-diagram-container .arrow-down.liquid-arrow {
  border-width: 8px 5px 0 5px;
  border-color: blue transparent transparent transparent;
}

.distillation-diagram-container .arrow-left.liquid-arrow {
  border-width: 5px 8px 5px 0;
  border-color: transparent blue transparent transparent;
}

.distillation-diagram-container .arrow-right.liquid-arrow {
  border-width: 5px 0 5px 8px;
  border-color: transparent transparent transparent blue;
}

.distillation-diagram-container .reboiler-heat-inlet,
.distillation-diagram-container .reboiler-heat-outlet {
  position: absolute;
  width: 40px;
  height: 4px;
  background-color: black;
  left: 400px;
  z-index: 4;
}

.distillation-diagram-container .reboiler-heat-inlet {
  top: 450px;
}

.distillation-diagram-container .reboiler-heat-outlet {
  top: 475px;
}

.distillation-diagram-container .reboiler-heat-inlet-arrow,
.distillation-diagram-container .reboiler-heat-outlet-arrow {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 5px 0 5px 8px;
  border-color: transparent transparent transparent black;
  z-index: 4;
}

.distillation-diagram-container .reboiler-heat-inlet-arrow {
  top: 448px;
  left: 395px;
}

.distillation-diagram-container .reboiler-heat-outlet-arrow {
  top: 473px;
  left: 435px;
}

.distillation-diagram-container .legend {
  position: absolute;
  right: 15px;
  bottom: 15px;
  border: 1px solid #888;
  padding: 8px 12px;
  background-color: rgba(255, 255, 255, 0.9);
  z-index: 25;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.distillation-diagram-container .legend-item {
  display: flex;
  align-items: center;
  margin-bottom: 6px;
  font-size: 12px;
}

.distillation-diagram-container .legend-item:last-child {
  margin-bottom: 0;
}

.distillation-diagram-container .color-box {
  width: 25px;
  height: 4px;
  margin-right: 8px;
  position: relative;
}

.distillation-diagram-container .color-box.vapor {
  background-color: red;
}

.distillation-diagram-container .color-box.liquid {
  background-color: blue;
}

.distillation-diagram-container .color-box::after {
  content: '';
  position: absolute;
  top: -3px;
  right: -8px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 5px 0 5px 8px;
}

.distillation-diagram-container .color-box.vapor::after {
  border-color: transparent transparent transparent red;
}

.distillation-diagram-container .color-box.liquid::after {
  border-color: transparent transparent transparent blue;
}


/* Typewriter Code Snippet */
.typewriter-code {
  margin: 1px;
  padding: 5px;
  background: transparent;
  font-family: 'Consolas', 'SF Mono', 'Courier New', monospace;
  font-size: 12px;
  border-radius: 5px;
  white-space: pre-wrap;
  position: relative;
  z-index: 1;
  line-height: 1.5;
  box-shadow: 0 0 15px rgba(52, 152, 219, 0.5);
  width: 100%;
  max-width: 650px;
  box-sizing: border-box;
  text-align: justify;
  overflow-wrap: break-word;
  word-break: break-all;
  overflow: hidden;
  border-right: 2.5px solid #24eb7e;
  border-left: 2.5px solid #24eb7e;
  border-top: 2.5px solid #24eb7e;
  border-bottom: 2.5px solid #24eb7e;
  animation: typing 5s steps(50, end) forwards, blink-caret 0.75s step-end infinite;
  text-align: left;
  margin-left: 1px;
  padding-left: 1px;
}

.typewriter-code::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(52, 152, 219, 0.1), rgba(46, 204, 113, 0.1));
  z-index: -1;
  border-radius: 5px;
}

.typewriter-code span {
  color: #114bdc;
}

.typewriter-code .keyword {
  color: #e70b88;
}

.typewriter-code .function {
  color: #2ba907;
}

.typewriter-code .string {
  color: #ff5555;
}

.typewriter-code .comment {
  color: #10e4c4d0;
}

@keyframes typing {
  from {
    width: 0;
  }

  to {
    width: 100%;
  }
}

@keyframes blink-caret {
  50% {
    border-color: transparent;
  }
}

/* Preloader */
#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--main-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader {
  width: 60px;
  height: 60px;
  position: relative;
}

.loader svg circle {
  stroke-dasharray: 150, 200;
  stroke-dashoffset: 0;
  transform-origin: center;
  animation: dash 1.5s ease-in-out infinite, rotate 2s linear infinite;
}

@keyframes dash {
  0% {
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
  }

  50% {
    stroke-dasharray: 89, 200;
    stroke-dashoffset: -35;
  }

  100% {
    stroke-dasharray: 89, 200;
    stroke-dashoffset: -124;
  }
}

@keyframes rotate {
  100% {
    transform: rotate(360deg);
  }
}

/* Accessibility */
a:focus,
button:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  z-index: 9999;
  transition: top 0.3s ease;
}

.skip-to-content:focus {
  top: 0;
}

/* Scroll Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hover Effects for Links */
a:not(.btn):not(.social-icon):hover {
  color: var(--primary-color);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--secondary-color);
}

[data-theme="dark"] ::-webkit-scrollbar-track {
  background: var(--dark-bg);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--primary-color);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 1200px) {
  html {
    font-size: 15px;
  }
}

@media (max-width: 992px) {
  html {
    font-size: 14px;
  }

  .about-content {
    flex-direction: column;
  }

  .hero-content h1 {
    font-size: 3.5rem;
  }

  .about .main-content {
    flex-basis: 60%;
  }

  .about .sidebar {
    flex-basis: 35%;
  }

  .distillation-column-wrapper {
    width: calc(700px * 0.75);
    height: calc(550px * 0.75);
  }

  .distillation-diagram-container {
    transform: scale(0.75);
  }

  .typewriter-code {
    font-size: 7px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  header {
    padding: 1rem;
  }

  .menu-toggle {
    display: block;
  }

  .theme-toggle {
    margin-right: 0.5rem;
  }

  nav {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 80%;
    height: calc(100vh - 70px);
    background-color: var(--main-bg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    z-index: 999;
    overflow-y: auto;
  }

  nav.active {
    left: 0;
  }

  nav ul {
    flex-direction: column;
    padding: 2rem;
  }

  nav ul li {
    margin: 1rem 0;
  }

  nav ul li a {
    display: block;
    padding: 0.5rem 0;
  }

  .hero-content h1 {
    font-size: 2.8rem;
  }

  .hero-content h3 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 2.2rem;
  }

  .book-grid,
  .semester-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  section#about.about .about-content {
    flex-direction: column;
  }

  section#about.about .main-content,
  section#about.about .sidebar {
    flex: 0 0 100%;
  }

  section#about.about .profile-section {
    flex-direction: column;
    text-align: center;
  }

  section#about.about .profile-image {
    margin: 0 auto;
  }

  section#about.about .section-title {
    font-size: 1.8rem;
  }

  section#about.about .bio-text h3 {
    font-size: 1.3rem;
  }

  section#about.about .bio-text p {
    font-size: 0.95rem;
  }

  section#about.about .edu-item {
    flex-direction: row;
    text-align: left;
  }

  section#contact.contact {
    padding: 3rem 0;
  }

  section#contact.contact .section-title {
    font-size: 1.8rem;
    margin-bottom: 2rem;
  }

  section#contact.contact .section-title::after {
    width: 30px;
  }

  section#contact.contact .contact-content {
    flex-direction: column;
    gap: 1.5rem;
  }

  section#contact.contact .social-links,
  section#contact.contact .contact-form {
    flex: 1 1 100%;
  }

  section#contact.contact .social-icons {
    gap: 0.75rem;
  }

  section#contact.contact .social-icon {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
  }

  section#contact.contact .form-group {
    margin-bottom: 1rem;
  }

  section#contact.contact .submit-btn {
    width: 100%;
  }

  .btn {
    padding: 12px 26px;
  }

  .modal-content {
    padding: 1rem;
  }

  .modal-header h3 {
    font-size: 1.2em;
  }

  .modal-body {
    padding: 1rem;
  }

  .about .about-content {
    flex-direction: column;
  }

  .about .main-content,
  .about .sidebar {
    flex-basis: 100%;
    min-width: unset;
  }

  .distillation-column-wrapper {
    width: calc(700px * 0.6);
    height: calc(550px * 0.6);
  }

  .distillation-diagram-container {
    transform: scale(0.6);
  }

  .distillation-diagram-container .label {
    font-size: 12px;
  }

  .bio-text p {
    text-align: left;
  }

  .typewriter-code {
    font-size: 7px;
    padding: 2px;
    line-height: 1;
    animation: none;
    border-right: none;
    overflow: visible;
    white-space: pre-wrap;
    width: 100%;
  }
}

@media (max-width: 576px) {
  html {
    font-size: 14px;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 80%;
    margin: 0 auto;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .content-display-area {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-content h3 {
    font-size: 1.2rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .about .section-title {
    font-size: 1.8em;
  }

  .distillation-column-wrapper {
    width: calc(700px * 0.45);
    height: calc(550px * 0.45);
  }

  .distillation-diagram-container {
    transform: scale(0.45);
  }

  .distillation-diagram-container .label {
    font-size: 10px;
  }

  .distillation-diagram-container .legend-item {
    font-size: 10px;
  }

  .distillation-diagram-container .legend {
    padding: 4px 6px;
    right: 5px;
    bottom: 5px;
  }

  .bio-text h3 {
    font-size: 1.4em;
  }

  .bio-text p {
    font-size: 0.9em;
  }

  .skills-logo-list {
    justify-content: center;
  }

  .typewriter-code {
    font-size: 7px;
    padding: 2px 2px;
    line-height: 1;
    animation: none;
    border-right: none;
    overflow: visible;
    white-space: pre-wrap;
    width: 100%;
  }
}