/**
 * --- IMPROVED CSS VARIABLES for Easy Customization and Dark Mode ---
 *
 * @format
 */

:root {
  /* 1. Base Color Palette */
  --primary-color: #0077b6; /* Professional Blue */
  --secondary-color: #00b4d8; /* Light Blue accents */
  --accent-color: #ff9f1c; /* Warm Orange highlights */
  /* 2. Spacing & Sizing */
  --max-width: 1200px;
  --spacing-xs: 8px;
  --spacing-sm: 15px;
  --spacing-md: 20px;
  --spacing-lg: 40px;
  --section-padding: 80px 0;
  /* 3. General Settings */
  --transition-time: 0.4s;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --border-color-light: rgba(0, 0, 0, 0.1);
  --shadow-dark: rgba(255, 255, 255, 0.15);
  --border-color-dark: rgba(255, 255, 255, 0.15);
  --card-shadow: 0 4px 12px var(--shadow);
  --hover-shadow-glow: rgba(
    0,
    119,
    182,
    0.4
  ); /* New subtle glow for hover effects */
  /* 4. Light Mode Theme (Default) */
  --bg-color: #f4f7f9;
  --text-color: #333;
  --section-bg: #e5e5e5;
  --card-bg: #ffffff;
  --header-bg: #03045e;
  --header-text: #e0e0e0;
  --shadow: var(--shadow-light);
  --border-color: var(--border-color-light);
  --hero-gradient-end: #005f8e;
  --mobile-menu-bg: var(--header-bg);
}

/* Dark Mode Variables (Toggled and prefers-color-scheme) */
@media (prefers-color-scheme: dark) {
  :root:not(.light-mode) {
    --bg-color: #1a1a2e;
    --text-color: #e0e0e0;
    --section-bg: #22223b;
    --card-bg: #333355;
    --header-bg: #0d0d1a;
    --header-text: #ffffff;
    --shadow: var(--shadow-dark);
    --border-color: var(--border-color-dark);
    --hero-gradient-end: #1f2746;
    --mobile-menu-bg: var(--header-bg);
    --hover-shadow-glow: rgba(
      0,
      180,
      216,
      0.4
    ); /* Adjusted glow for dark mode */
  }
}

body.dark-mode {
  --bg-color: #1a1a2e;
  --text-color: #e0e0e0;
  --section-bg: #22223b;
  --card-bg: #333355;
  --header-bg: #0d0d1a;
  --header-text: #ffffff;
  --shadow: var(--shadow-dark);
  --border-color: var(--border-color-dark);
  --hero-gradient-end: #1f2746;
  --mobile-menu-bg: var(--header-bg);
  --hover-shadow-glow: rgba(0, 180, 216, 0.4);
}

body.light-mode {
  --bg-color: #f4f7f9;
  --text-color: #333;
  --section-bg: #e5e5e5;
  --card-bg: #ffffff;
  --header-bg: #03045e;
  --header-text: #e0e0e0;
  --shadow: var(--shadow-light);
  --border-color: var(--border-color-light);
  --hero-gradient-end: #005f8e;
  --mobile-menu-bg: var(--header-bg);
  --hover-shadow-glow: rgba(0, 119, 182, 0.4);
}

/*
 * --- General Styles ---
 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  scroll-behavior: smooth;
  transition: background-color var(--transition-time),
    color var(--transition-time);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

a:focus-visible,
button:focus-visible {
  /* High contrast focus outline for A11Y */
  outline: 3px solid var(--accent-color);
  outline-offset: 4px;
  border-radius: 4px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

section {
  padding: var(--section-padding);
  transition: background-color var(--transition-time);
}

section:nth-of-type(even) {
  background-color: var(--section-bg);
}

hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 0;
  opacity: 0.5;
  transition: border-color var(--transition-time);
}

h1,
h2,
h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
  transition: color var(--transition-time);
}

h1 {
  font-size: 3.5em;
  margin-bottom: var(--spacing-sm);
}

h2 {
  font-size: 2.5em;
  text-align: center;
  position: relative;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

/* FIX 1: Missing styles from original for H2 underline */
h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(
    to right,
    var(--primary-color),
    var(--secondary-color)
  );
  border-radius: 2px;
  transition: background 0.4s ease;
}

p {
  margin-bottom: var(--spacing-sm);
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: color var(--transition-time);
}

a:hover {
  color: var(--accent-color);
}

.highlight,
.hero-text strong {
  color: var(--accent-color);
  font-weight: 700;
}

/* --- Animations --- */
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-8px);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(var(--spacing-md));
  }

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 25px;
  border-radius: 8px;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
  margin-right: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  border: none;
  cursor: pointer;
  color: #fff;
  text-decoration: none;
}

.btn i {
  margin-left: var(--spacing-xs);
}

.btn-primary {
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--secondary-color)
  );
  box-shadow: 0 6px 15px var(--shadow-light);
  background-size: 200% auto;
  transition: all 0.4s ease;
}

.btn-primary:hover {
  transform: translateY(-4px);
  /* FIX 2: Ensure primary button hover shadow uses new glow variable */
  box-shadow: 0 10px 25px var(--shadow), 0 0 15px var(--hover-shadow-glow);
  background-position: right center;
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-color);
  border: 2px solid var(--accent-color);
  box-shadow: none;
}

.btn-secondary i {
  color: var(--accent-color);
  transition: color 0.3s ease;
}

.btn-secondary:hover {
  background-color: var(--accent-color);
  /* FIX 3: Use header-bg for contrasting text color on hover */
  color: var(--header-bg);
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(255, 159, 28, 0.3);
}

.btn-secondary:hover i {
  /* FIX 4: Ensure icon color flips to contrast text on hover */
  color: var(--header-bg);
}

.btn-small {
  padding: 8px 15px;
  font-size: 0.9em;
  margin-right: 10px;
  margin-bottom: 10px;
}

.btn-large {
  padding: 15px 40px;
  font-size: 1.2em;
  margin-top: 20px;
}

/* --- Navbar & Theme Toggle --- */
.navbar {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 15px var(--shadow);
  transition: background-color var(--transition-time),
    box-shadow var(--transition-time);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar .logo {
  color: var(--header-text);
  font-size: 1.8em;
  font-weight: 800;
}

.navbar .logo .highlight {
  color: var(--accent-color);
}

.navbar .nav-links {
  /* FIX 5: Ensure desktop nav-links are always displayed */
  display: flex;
  align-items: center;
}

.navbar .nav-links > a {
  color: var(--header-text);
  margin-left: 30px;
  font-size: 1.1em;
  transition: color 0.3s ease;
  -webkit-tap-highlight-color: transparent;
}

.navbar .nav-links > a:hover {
  color: var(--accent-color);
}

#theme-toggle .icon-swap {
  display: inline-block;
}

#theme-toggle {
  background: none;
  border: none;
  color: var(--header-text);
  font-size: 1.2em;
  margin-left: var(--spacing-md);
  cursor: pointer;
  transition: color var(--transition-time), transform var(--transition-time);
  filter: drop-shadow(0 0 1px var(--header-text));
}

#theme-toggle:hover {
  color: var(--accent-color);
  transform: rotate(360deg) scale(1.1);
}

.burger-menu {
  display: none; /* Hidden by default on desktop */
  cursor: pointer;
  padding: var(--spacing-xs);
  border: none;
  background: none;
  z-index: 1010;
}

.burger-menu div {
  width: 25px;
  height: 3px;
  background-color: var(--header-text);
  margin: 5px;
  transition: all 0.3s ease;
}

/* --- Hero Section --- */
.hero-section {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--hero-gradient-end)
  );
  color: var(--header-text);
  min-height: 90vh;
  display: flex;
  align-items: center;
  transition: background 0.4s ease;
}

.hero-content {
  display: flex;
  justify-content: space-around;
  align-items: center;
  text-align: left;
  width: 100%;
  padding: 60px 0;
  animation: fadeIn 1s ease-out;
}

.hero-text {
  max-width: 60%;
  margin-right: 30px;
}

.hero-text h1 {
  font-size: 4em;
  font-weight: 900;
  margin-bottom: var(--spacing-sm);
  color: var(--header-text);
}

.hero-text .lead {
  font-size: 1.6em;
  margin-bottom: 30px;
  font-weight: 300;
}

.hero-image {
  max-width: 40%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.profile-pic {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 5px solid var(--accent-color);
  object-fit: cover;
  box-shadow: 0 0 0 10px rgba(255, 255, 255, 0.05), 0 15px 30px var(--shadow);
  animation: float 4s ease-in-out infinite;
}

.hero-image img {
  box-shadow: 0 0 0 10px rgba(255, 255, 255, 0.05), 0 15px 30px var(--shadow),
    0 0 15px var(--hover-shadow-glow);
}

/* --- Social Links --- */
.social-links {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.social-links a {
  color: var(--header-text);
  font-size: 2.2em;
  margin: 0 var(--spacing-sm);
  transition: transform 0.3s ease;
}

.social-links a:hover {
  transform: translateY(-5px) scale(1.05);
  color: var(--accent-color);
}

/*
 * --- About Section ---
 */
.about-content {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  justify-content: space-between;
}

.about-img {
  width: 40%;
  max-width: 400px;
  border-radius: 8px;
  box-shadow: var(--card-shadow);
}

.about-content > div {
  flex: 1;
}

/* FIX 6: Added back the sub-heading style from the HTML update */
.about-content h3 {
  color: var(--primary-color);
  border-bottom: 2px solid var(--secondary-color);
  padding-bottom: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

/*
 * --- Skills Section ---
 */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.skill-category {
  background-color: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: 10px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.skill-category:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px var(--shadow), 0 0 10px var(--secondary-color);
}

.skill-category h3 {
  color: var(--primary-color);
  border-bottom: 2px solid var(--secondary-color);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  padding: var(--spacing-xs) 0;
  display: flex;
  align-items: center;
}

.skill-category i {
  color: var(--accent-color);
  margin-right: var(--spacing-sm);
  font-size: 1.1em;
}

/*
 * --- Projects Section ---
 */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-color);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 30px var(--shadow), 0 0 15px var(--primary-color);
}

.project-card figure {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.project-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover img {
  transform: scale(1.05);
}

.project-card h3 {
  margin: var(--spacing-md) var(--spacing-md) var(--spacing-xs);
  color: var(--secondary-color);
}

.project-card p {
  padding: 0 var(--spacing-md);
  flex-grow: 1;
}

.project-tech {
  padding: var(--spacing-xs) var(--spacing-md);
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.project-tech span {
  display: inline-block;
  background-color: var(--section-bg);
  color: var(--text-color);
  font-size: 0.8em;
  padding: 4px 8px;
  border-radius: 4px;
  margin-right: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

.project-links {
  padding: 0 var(--spacing-md) var(--spacing-md);
  display: flex;
  gap: var(--spacing-xs);
  justify-content: flex-start;
  flex-wrap: wrap;
}

/*
 * --- Contact Section ---
 */
.contact-section .contact-intro {
  text-align: center;
  font-size: 1.2em;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.contact-details {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  /* FIX 7: Resetting the default italic style for <address> */
  font-style: normal;
}

.contact-details p {
  display: flex;
  align-items: center;
  margin-bottom: 0;
}

.contact-details i {
  color: var(--accent-color);
  margin-right: var(--spacing-xs);
  font-size: 1.2em;
}

.contact-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

/*
 * --- Footer Section ---
 */
footer {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: var(--spacing-md) 0;
  text-align: center;
  font-size: 0.9em;
  border-top: 5px solid var(--accent-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-content a {
  color: var(--header-text);
  margin: 0 var(--spacing-xs);
  transition: color 0.3s ease;
}

.footer-content a:hover {
  color: var(--secondary-color);
}

/*
 * --- Responsive Adjustments ---
 */
@media (max-width: 1024px) {
  .about-img {
    width: 35%;
    max-width: 300px;
  }
}

@media (max-width: 768px) {
  .burger-menu {
    display: block;
  }

  /* FIX 8: Hide desktop nav-links on mobile without using 'display: none' immediately */
  .navbar .nav-links {
    /* Mobile Menu Styles */
    position: fixed;
    top: 0;
    right: 0;
    width: 60%;
    height: 100vh;
    background-color: var(--mobile-menu-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transform: translateX(100%);
    transition: transform 0.4s ease-in-out;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    z-index: 1005;
    /* FIX 9: We use flex in the .active state, not here. We need to hide it visually first */
    /* display: none; */
  }
  /* FIX 10: Only slide the menu in and apply flex display when 'active' */
  .navbar .nav-links.active {
    transform: translateX(0%);
    display: flex;
  }

  .navbar .nav-links > a {
    margin: var(--spacing-sm) 0;
    font-size: 1.5em;
    width: 100%;
    text-align: center;
    padding: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
    color: var(--header-text);
  }

  .navbar .nav-links > a:last-of-type {
    border-bottom: none;
  }

  #theme-toggle {
    margin-top: var(--spacing-lg);
    font-size: 1.8em;
  }

  /* Hero Section Stacking */
  .hero-content {
    flex-direction: column;
    text-align: center;
    padding: 40px 0;
  }

  .hero-text {
    max-width: 100%;
    order: 2;
    margin-right: 0;
  }

  .hero-image {
    max-width: 100%;
    order: 1;
    margin-bottom: 30px;
  }

  .profile-pic {
    width: 250px;
    height: 250px;
  }

  /* About Section Stacking */
  .about-content {
    flex-direction: column;
    text-align: center;
  }

  .about-img {
    width: 100%;
    max-width: 450px;
    margin-bottom: var(--spacing-md);
  }

  .about-content h3 {
    text-align: center;
  }

  /* Contact Section Stacking */
  .contact-details {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
  }

  .contact-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-large {
    width: 80%;
    max-width: 350px;
  }

  /* Grid Layouts */
  .skills-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  h2 {
    font-size: 2em;
  }

  /* Footer Stacking */
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 2.5em;
  }

  .hero-text .lead {
    font-size: 1.2em;
  }

  .profile-pic {
    width: 180px;
    height: 180px;
  }

  .social-links a {
    font-size: 1.8em;
    margin: 0 10px;
  }
}

/* Burger Menu Animation */
.burger-menu.active .line1 {
  transform: rotate(-45deg) translate(-5px, 6px);
}

.burger-menu.active .line2 {
  opacity: 0;
}

.burger-menu.active .line3 {
  transform: rotate(45deg) translate(-5px, -6px);
}