/* Import Poppins and Inter fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/icon?family=Material+Icons+Round');

:root {
  /* Dark Theme variables (default) */
  --bg-primary: #0a0b10;
  --bg-secondary: #121420;
  --bg-card: rgba(22, 26, 43, 0.7);
  --bg-nav: rgba(10, 11, 16, 0.75);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Neon Accents */
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.3);
  --secondary: #a855f7;
  --secondary-glow: rgba(168, 85, 247, 0.3);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Brand Branch Colors (Modern HSL values for customization) */
  --brand-computer: #8b5cf6;
  --brand-it: #3b82f6;
  --brand-civil: #f97316;
  --brand-mechanical: #eab308;
  --brand-electrical: #ef4444;
  --brand-etc: #06b6d4;

  /* Misc */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --glass-blur: 16px;
  --shadow-neon: 0 0 20px var(--primary-glow);
}

[data-theme="light"] {
  /* Light Theme variables */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-nav: rgba(248, 250, 252, 0.85);
  --border-color: rgba(15, 23, 42, 0.08);
  --border-hover: rgba(15, 23, 42, 0.16);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --primary: #4f46e5;
  --primary-glow: rgba(79, 70, 229, 0.15);
  --secondary: #9333ea;
  --secondary-glow: rgba(147, 51, 234, 0.15);
  --bg-card-rgb: 255, 255, 255;
}

/* Resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) var(--bg-secondary);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  padding-top: 80px; /* Header spacing */
}

/* Navbar */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background-color: var(--bg-nav);
  backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo span.material-icons-round {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.8rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width var(--transition-fast);
  border-radius: 2px;
}

.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--border-color);
  border-color: var(--border-hover);
  transform: rotate(15deg) scale(1.05);
}

.contrib-badge {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.contrib-badge span.material-icons-round {
  font-size: 1rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.8rem;
  cursor: pointer;
}

/* Views & Dynamic Content */
.view-section {
  display: none;
  animation: fadeSlideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.view-section.active {
  display: block;
}

/* Animations */
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.2);
  }
  50% {
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.45);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* Button & Link UI */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
  box-shadow: var(--shadow-neon);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(99, 102, 241, 0.5);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-icon-only {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
}

/* Container limits */
.content-wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* Glass Card styling */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

/* --- 1. HERO SECTION & HOME --- */
.hero {
  text-align: center;
  padding: 60px 24px;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.12) 0%, transparent 60%);
}

.hero h1 {
  font-size: 3.5rem;
  line-height: 1.2;
  margin-bottom: 16px;
  font-family: 'Poppins', sans-serif;
  letter-spacing: -1px;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 32px auto;
}

/* Search Bar */
.search-container {
  max-width: 640px;
  margin: 0 auto 40px auto;
  position: relative;
}

.search-bar {
  width: 100%;
  padding: 18px 24px 18px 56px;
  font-size: 1.05rem;
  border: 1px solid var(--border-color);
  border-radius: 30px;
  background: var(--bg-card);
  color: var(--text-primary);
  backdrop-filter: blur(var(--glass-blur));
  outline: none;
  transition: all var(--transition-normal);
}

.search-bar:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-size: 1.6rem;
}

.search-results-dropdown {
  position: absolute;
  top: 105%;
  left: 0;
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  max-height: 320px;
  overflow-y: auto;
  z-index: 99;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  text-align: left;
  display: none;
}

.search-result-item {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.search-result-title {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.search-result-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--border-color);
  padding: 2px 8px;
  border-radius: 12px;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-family: 'Poppins', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Branch Grid Styling */
.section-title {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2.2rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  margin: 12px auto 0 auto;
  border-radius: 2px;
}

.branches-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}

.branch-card {
  position: relative;
  cursor: pointer;
  overflow: hidden;
}

.branch-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--branch-color, var(--primary));
  transition: height var(--transition-normal);
  z-index: 2;
}

.branch-card:hover::before {
  height: 8px;
}

.branch-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--branch-color, var(--primary));
  transition: all var(--transition-normal);
}

.branch-card:hover .branch-icon-wrap {
  background: var(--branch-color, var(--primary));
  color: #fff;
  transform: rotate(-10deg) scale(1.1);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.branch-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.branch-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 20px;
}

.branch-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--branch-color, var(--primary));
  transition: transform var(--transition-fast);
}

.branch-card:hover .branch-link-btn {
  transform: translateX(6px);
}

/* Home Upload Info CTA */
.cta-banner {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(168, 85, 247, 0.15) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  margin-top: 60px;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.2) 0%, transparent 70%);
  top: -150px;
  right: -50px;
  z-index: 0;
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 60%;
}

.cta-content h2 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.cta-content p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.cta-action {
  position: relative;
  z-index: 1;
}

/* --- 2. BRANCH VIEW (SEMESTERS & SUBJECTS) --- */
.branch-header {
  margin-bottom: 40px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.branch-title-group h2 {
  font-size: 2.2rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.branch-title-group p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  margin-bottom: 20px;
  transition: color var(--transition-fast);
}

.back-btn:hover {
  color: var(--text-primary);
}

/* Semester Expandable Accordion */
.semester-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.semester-row {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.semester-trigger {
  width: 100%;
  padding: 24px;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: var(--text-primary);
  text-align: left;
  transition: background var(--transition-fast);
}

.semester-trigger:hover {
  background: rgba(255, 255, 255, 0.02);
}

.semester-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sem-num-badge {
  width: 44px;
  height: 44px;
  background: var(--primary-glow);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
}

.sem-details h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.sem-details span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.sem-chevron {
  font-size: 1.8rem;
  color: var(--text-secondary);
  transition: transform var(--transition-normal);
}

.semester-row.open {
  border-color: var(--border-hover);
}

.semester-row.open .sem-chevron {
  transform: rotate(180deg);
}

.semester-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) cubic-bezier(0, 1, 0, 1); /* Accordion collapse trick */
  background: rgba(0, 0, 0, 0.15);
}

.semester-row.open .semester-content {
  max-height: 1000px;
  transition: max-height var(--transition-normal) cubic-bezier(1, 0, 1, 0);
  border-top: 1px solid var(--border-color);
}

.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 24px;
}

.subject-card {
  padding: 20px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.subject-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.subject-code {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--primary);
  background: var(--primary-glow);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 12px;
}

.subject-card h4 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.subject-stat-bar {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  margin-top: 12px;
}

.subject-stat-bar span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- 3. PRACTICALS LIST PAGE --- */
.subject-header-card {
  margin-bottom: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.subject-header-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.subject-details h2 {
  font-size: 1.8rem;
  margin-bottom: 6px;
}

.subject-details p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.progress-container {
  min-width: 200px;
  text-align: right;
}

.progress-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  display: block;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  width: 0%;
  transition: width 0.8s ease;
}

.practicals-list {
  display: grid;
  gap: 16px;
}

.practical-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  gap: 16px;
}

.practical-row:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.prac-main {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 1;
}

.prac-status {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.prac-status.unsolved {
  border: 2px dashed var(--border-hover);
  color: var(--text-muted);
}

.prac-status.unsolved:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-glow);
}

.prac-status.solved {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  border: 1.5px solid var(--success);
}

.prac-status.contributed {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
  border: 1.5px solid #3b82f6;
}

.prac-details {
  flex: 1;
}

.prac-details h4 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  line-height: 1.4;
}

.prac-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.prac-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.difficulty-badge {
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
}

.difficulty-badge.easy {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.difficulty-badge.medium {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.difficulty-badge.hard {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.prac-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --- 4. SOLUTIONS UPLOAD VIEW --- */
.upload-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: start;
}

.upload-card-form {
  padding: 36px;
}

.upload-card-form h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.upload-card-form p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.full-width {
  grid-column: span 2;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 16px;
  padding-right: 40px;
}

[data-theme="light"] select.form-control {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

/* File Drop Area */
.file-drop-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  background: var(--bg-secondary);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.file-drop-area:hover, .file-drop-area.drag-over {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.03);
}

.file-drop-icon {
  font-size: 3rem;
  color: var(--text-secondary);
  background: var(--border-color);
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.file-drop-area:hover .file-drop-icon {
  color: var(--primary);
  background: var(--primary-glow);
  transform: translateY(-4px);
}

.file-drop-text h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.file-drop-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.file-selected-indicator {
  display: none;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--success);
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  animation: fadeSlideIn 0.3s ease;
}

.file-input-hidden {
  display: none;
}

.upload-instruction-card {
  padding: 30px;
}

.instruction-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.instruction-item {
  display: flex;
  gap: 16px;
}

.inst-number {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-glow);
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.85rem;
}

.inst-text h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.inst-text p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Success Pop-up / Toast */
.toast-msg {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #121420;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  transform: translateY(100px);
  opacity: 0;
  z-index: 2000;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast-msg.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-msg.success-toast {
  border-left: 4px solid var(--success);
}

.toast-msg.error-toast {
  border-left: 4px solid var(--danger);
}

/* --- 5. ABOUT PAGE --- */
.about-hero {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px auto;
}

.about-hero h2 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.about-hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-bottom: 60px;
}

.about-card {
  text-align: center;
  padding: 40px 24px;
}

.about-card-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 20px;
}

.about-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.team-section h2 {
  text-align: center;
  margin-bottom: 40px;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.team-member {
  text-align: center;
  padding: 30px 20px;
}

.member-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  margin: 0 auto 20px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 2.2rem;
  font-weight: 700;
  box-shadow: 0 8px 16px rgba(99, 102, 241, 0.25);
}

.team-member h3 {
  font-size: 1.15rem;
  margin-bottom: 6px;
}

.team-member p {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.member-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- 6. CONTACT PAGE --- */
.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info h2 {
  font-size: 2rem;
}

.contact-info p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 10px;
}

.method-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
}

.method-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-glow);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.method-details h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}

.method-details p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.contact-form {
  padding: 36px;
}

.contact-form h3 {
  font-size: 1.4rem;
  margin-bottom: 16px;
}

/* FAQ / Accordion Section */
.faq-section {
  margin-top: 60px;
}

.faq-title {
  text-align: center;
  margin-bottom: 32px;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: var(--text-primary);
  font-weight: 600;
  text-align: left;
  font-size: 1rem;
}

.faq-chevron {
  color: var(--text-secondary);
  transition: transform var(--transition-normal);
}

.faq-item.open {
  border-color: var(--border-hover);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) cubic-bezier(0, 1, 0, 1);
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.faq-item.open .faq-answer {
  max-height: 200px;
  transition: max-height var(--transition-normal) cubic-bezier(1, 0, 1, 0);
  padding: 0 24px 20px 24px;
  border-top: 0;
}

/* --- 7. SOLUTION PREVIEW MODAL --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 3000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-container {
  width: 90%;
  max-width: 800px;
  height: 85vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active .modal-container {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
}

.modal-title-group h3 {
  font-size: 1.2rem;
  margin-bottom: 2px;
}

.modal-title-group p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.8rem;
  transition: color var(--transition-fast);
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  background: #1e1e24; /* Code editor background or page layout */
}

/* Emulated PDF/Document solution view */
.pdf-viewer-emulator {
  background: #ffffff;
  color: #1e293b;
  min-height: 100%;
  border-radius: var(--radius-sm);
  padding: 40px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  font-family: 'Times New Roman', Times, serif;
}

.pdf-doc-title {
  text-align: center;
  border-bottom: 2px double #1e293b;
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.pdf-doc-title h2 {
  font-family: 'Times New Roman', Times, serif;
  font-size: 1.6rem;
  text-transform: uppercase;
}

.pdf-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  font-size: 1rem;
  margin-bottom: 30px;
  border-bottom: 1px solid #cbd5e1;
  padding-bottom: 16px;
}

.pdf-meta-item strong {
  font-weight: 700;
}

.pdf-content-section {
  margin-bottom: 24px;
}

.pdf-content-section h4 {
  font-family: 'Times New Roman', Times, serif;
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 8px;
  border-bottom: 1px solid #1e293b;
  padding-bottom: 4px;
}

.pdf-content-section p {
  font-size: 1rem;
  line-height: 1.6;
  text-align: justify;
  margin-bottom: 12px;
}

.pdf-code-block {
  font-family: 'Courier New', Courier, monospace !important;
  background: #f1f5f9;
  padding: 16px;
  border-radius: 4px;
  border: 1px solid #cbd5e1;
  white-space: pre-wrap;
  margin: 12px 0;
  font-size: 0.9rem;
  color: #0f172a;
}

.pdf-footer {
  text-align: center;
  margin-top: 40px;
  font-size: 0.85rem;
  color: #64748b;
  border-top: 1px solid #cbd5e1;
  padding-top: 12px;
}

/* Footer Section */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 24px;
  text-align: center;
  transition: all var(--transition-normal);
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-logo {
  font-size: 1.2rem;
  font-weight: 700;
  font-family: 'Poppins', sans-serif;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Response and Media Queries */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  .upload-layout {
    grid-template-columns: 1fr;
  }
  .contact-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* Mobile navigation menu drawer or hidden on mobile */
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .branches-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-banner {
    flex-direction: column;
    padding: 30px;
    text-align: center;
  }
  
  .cta-content {
    max-width: 100%;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-group.full-width {
    grid-column: span 1;
  }
  
  .practical-row {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .prac-actions {
    width: 100%;
    justify-content: flex-end;
    margin-top: 10px;
  }
  
  .branch-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .subject-header-card {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .progress-container {
    width: 100%;
    text-align: left;
  }
}

/* Dropdown styling specifically for responsive links */
.mobile-nav-menu {
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  z-index: 999;
  transform: translateY(-200%);
  transition: transform var(--transition-normal);
  box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

.mobile-nav-menu.active {
  transform: translateY(0);
}

.mobile-nav-menu a {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}

.mobile-nav-menu a:last-child {
  border-bottom: none;
}

.mobile-nav-menu a.active {
  color: var(--text-primary);
  font-weight: 600;
}