/* ============================================================
   CampusCoders — Main Design System
   Deep Navy + Electric Blue + Amber Accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ─── CSS Custom Properties ─────────────────────────────────── */
:root {
  /* Brand Colors */
  --c-primary:      #2563EB;  /* Electric Blue */
  --c-primary-dark: #1D4ED8;
  --c-primary-light:#3B82F6;
  --c-accent:       #F59E0B;  /* Amber */
  --c-accent-dark:  #D97706;
  --c-success:      #10B981;
  --c-danger:       #EF4444;
  --c-warning:      #F59E0B;

  /* Dark Theme (default) */
  --bg-root:       #060C18;
  --bg-surface:    #0D1526;
  --bg-card:       #111D35;
  --bg-card-hover: #162040;
  --bg-nav:        rgba(6, 12, 24, 0.85);
  --bg-input:      #0D1526;

  /* Glass Effect */
  --glass-bg:      rgba(17, 29, 53, 0.6);
  --glass-border:  rgba(37, 99, 235, 0.2);
  --glass-blur:    20px;

  /* Text */
  --text-primary:  #F1F5F9;
  --text-secondary:#94A3B8;
  --text-muted:    #64748B;
  --text-accent:   #60A5FA;

  /* Borders */
  --border:        rgba(37, 99, 235, 0.15);
  --border-strong: rgba(37, 99, 235, 0.35);

  /* Gradients */
  --grad-hero:     linear-gradient(135deg, #060C18 0%, #0D1526 50%, #0A1628 100%);
  --grad-blue:     linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
  --grad-amber:    linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
  --grad-card:     linear-gradient(145deg, rgba(17,29,53,0.9), rgba(13,21,38,0.7));

  /* Shadows */
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:     0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg:     0 10px 40px rgba(0,0,0,0.4);
  --shadow-glow:   0 0 30px rgba(37,99,235,0.3);
  --shadow-glow-sm:0 0 15px rgba(37,99,235,0.2);

  /* Spacing */
  --section-py: 100px;
  --container:  1280px;

  /* Radius */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 999px;

  /* Typography */
  --font-body: 'Inter', system-ui, sans-serif;
  --font-head: 'Space Grotesk', 'Inter', sans-serif;

  /* Transitions */
  --t-fast:   150ms ease;
  --t-base:   250ms ease;
  --t-slow:   400ms ease;
}

/* ─── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg-root);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--text-accent); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-primary-light); }
ul { list-style: none; }
input, textarea, select, button { font-family: inherit; }

/* ─── Typography ─────────────────────────────────────────────── */
h1,h2,h3,h4,h5,h6 { font-family: var(--font-head); line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.25rem; }
p  { color: var(--text-secondary); line-height: 1.75; }

.text-gradient {
  background: var(--grad-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent-gradient {
  background: var(--grad-amber);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Layout ─────────────────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-py) 0;
}

.section-sm { padding: 60px 0; }
.section-lg { padding: 140px 0; }

/* ─── Section Headers ────────────────────────────────────────── */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-primary-light);
  background: rgba(37,99,235,0.1);
  border: 1px solid rgba(37,99,235,0.25);
  padding: 6px 16px;
  border-radius: var(--r-full);
  margin-bottom: 16px;
}

.section-header h2 {
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--r-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--t-base);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--t-fast);
}
.btn:hover::before { background: rgba(255,255,255,0.08); }

.btn-primary {
  background: var(--grad-blue);
  color: #fff;
  box-shadow: 0 4px 20px rgba(37,99,235,0.4);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37,99,235,0.5);
}

.btn-accent {
  background: var(--grad-amber);
  color: #fff;
  box-shadow: 0 4px 20px rgba(245,158,11,0.4);
}
.btn-accent:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245,158,11,0.5);
}

.btn-outline {
  background: transparent;
  color: var(--c-primary-light);
  border: 2px solid var(--c-primary);
}
.btn-outline:hover {
  background: rgba(37,99,235,0.1);
  color: var(--c-primary-light);
}

.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-sm { padding: 8px 18px; font-size: 0.85rem; }
.btn-lg { padding: 18px 36px; font-size: 1.05rem; }

.btn-glow {
  animation: glow-pulse 2.5s infinite;
}

@keyframes glow-pulse {
  0%,100% { box-shadow: 0 4px 20px rgba(37,99,235,0.4); }
  50%      { box-shadow: 0 4px 40px rgba(37,99,235,0.7); }
}

/* ─── Cards ──────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all var(--t-base);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
}

.card-body { padding: 28px; }
.card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }

/* ─── Badges ─────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--r-full);
}

.badge-blue  { background: rgba(37,99,235,0.15); color: #60A5FA; }
.badge-green { background: rgba(16,185,129,0.15); color: #34D399; }
.badge-amber { background: rgba(245,158,11,0.15); color: #FCD34D; }
.badge-red   { background: rgba(239,68,68,0.15);  color: #F87171; }
.badge-purple{ background: rgba(124,58,237,0.15); color: #A78BFA; }

/* ─── Grid Helpers ───────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }

/* ─── Divider ────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  margin: 0;
}

/* ─── Stats ──────────────────────────────────────────────────── */
.stat-card {
  text-align: center;
  padding: 32px 20px;
}

.stat-value {
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 800;
  background: var(--grad-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 8px;
  font-weight: 500;
}

/* ─── Forms ──────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  outline: none;
}

.form-control:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.form-control::placeholder { color: var(--text-muted); }

textarea.form-control { resize: vertical; min-height: 120px; }

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394A3B8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

/* ─── Alert / Flash ──────────────────────────────────────────── */
.alert {
  padding: 14px 18px;
  border-radius: var(--r-md);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.alert-success { background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.3); color: #34D399; }
.alert-error   { background: rgba(239,68,68,0.1);  border: 1px solid rgba(239,68,68,0.3);  color: #F87171; }
.alert-info    { background: rgba(37,99,235,0.1);  border: 1px solid rgba(37,99,235,0.3);  color: #60A5FA; }
.alert-warning { background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.3); color: #FCD34D; }

/* ─── Tags ───────────────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--r-full);
  background: rgba(37,99,235,0.1);
  color: var(--text-accent);
  border: 1px solid rgba(37,99,235,0.2);
}

/* ─── Scroll Animations ──────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease;
}
.fade-in.visible { opacity: 1; }

/* ─── Breadcrumb ─────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-accent); }
.breadcrumb a:hover { color: var(--c-primary-light); }
.breadcrumb-sep { color: var(--text-muted); }

/* ─── Page Hero (inner pages) ────────────────────────────────── */
.page-hero {
  padding: 120px 0 60px;
  text-align: center;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(37,99,235,0.12) 0%, transparent 70%);
  border-bottom: 1px solid var(--border);
}

.page-hero h1 { margin-bottom: 16px; }
.page-hero p { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ─── WhatsApp Float ─────────────────────────────────────────── */
.whatsapp-float {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 10px;
  background: #25D366;
  color: #fff;
  padding: 14px 22px;
  border-radius: var(--r-full);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 24px rgba(37,211,102,0.5);
  transition: all var(--t-base);
  text-decoration: none;
  animation: float-bob 3s ease-in-out infinite;
}

.whatsapp-float:hover {
  color: #fff;
  transform: scale(1.05);
  box-shadow: 0 6px 30px rgba(37,211,102,0.7);
}

@keyframes float-bob {
  0%,100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}

.whatsapp-float .wa-icon { font-size: 1.3rem; }

/* ─── Back to Top ────────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 120px;
  width: 48px;
  height: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--t-base);
  opacity: 0;
  pointer-events: none;
  z-index: 998;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.back-to-top.visible { opacity: 1; pointer-events: all; }
.back-to-top:hover { background: var(--c-primary); border-color: var(--c-primary); transform: translateY(-2px); }

/* ─── Marquee (partner logos) ────────────────────────────────── */
.marquee-wrapper {
  overflow: hidden;
  padding: 20px 0;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee-scroll 30s linear infinite;
}

.marquee-track:hover { animation-play-state: paused; }

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

.marquee-item {
  padding: 0 40px;
  opacity: 0.5;
  transition: opacity var(--t-base);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-secondary);
  white-space: nowrap;
}
.marquee-item:hover { opacity: 1; }

/* ─── Utility ────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-right  { text-align: right; }
.flex        { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.items-center{ align-items: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.w-full { width: 100%; }
.hidden { display: none; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ─── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-root); }
::-webkit-scrollbar-thumb { background: var(--c-primary); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-primary-light); }

/* ─── Selection ──────────────────────────────────────────────── */
::selection { background: rgba(37,99,235,0.3); color: #fff; }

/* ─── Responsive Grid & Layout Helpers ──────────────────────── */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.tool-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
}

.table-responsive table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
}

/* ─── Article & Blog Content (Prose) ─────────────────────────── */
.prose {
  word-break: break-word;
  overflow-wrap: break-word;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  margin: 16px 0;
}

.prose pre {
  max-width: 100%;
  overflow-x: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: var(--r-md);
  font-size: 0.9rem;
  margin: 16px 0;
}

.prose code {
  background: rgba(37, 99, 235, 0.1);
  color: var(--c-primary-light);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ─── Responsive Breakpoints ──────────────────────────────────── */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split-grid { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 768px) {
  :root {
    --section-py: 50px;
  }
  
  html, body {
    overflow-x: hidden !important;
    width: 100%;
  }

  .container {
    padding: 0 16px;
  }

  .hero-container {
    padding-top: 100px !important;
    padding-bottom: 40px !important;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Floating badges on mobile - keep inside card view */
  .floating-badge-top {
    position: relative !important;
    top: 0 !important;
    right: 0 !important;
    margin-bottom: 12px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }

  .floating-badge-bottom {
    position: relative !important;
    bottom: 0 !important;
    left: 0 !important;
    margin-top: 12px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
  }

  /* Touch-friendly Form Controls */
  .form-control, .btn {
    min-height: 44px;
    font-size: 0.95rem;
  }

  /* Floating action buttons on mobile - stack on opposite sides */
  .whatsapp-float {
    bottom: 16px;
    right: 16px;
    padding: 12px 16px;
    font-size: 0.85rem;
  }
  
  .whatsapp-float .wa-label {
    display: none;
  }

  .back-to-top {
    bottom: 16px;
    right: auto;
    left: 16px;
    width: 44px;
    height: 44px;
  }

  /* Converter Tool Mobile Adjustments */
  .tool-editor-grid {
    grid-template-columns: 1fr !important;
  }

  textarea.form-control {
    font-size: 0.9rem;
    padding: 12px;
  }

  /* Page hero headers on mobile */
  .page-hero {
    padding: 90px 0 40px;
  }

  .page-hero h1 {
    font-size: 1.8rem;
  }

  .page-hero p {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.85rem !important; }
  h2 { font-size: 1.5rem !important; }
  h3 { font-size: 1.2rem !important; }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    justify-content: center;
  }

  .trust-signals {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .card-body {
    padding: 20px;
  }

  .upload-zone {
    padding: 28px 14px !important;
  }

  .upload-icon-wrap {
    width: 60px !important;
    height: 60px !important;
    font-size: 1.8rem !important;
  }
}

/* ─── Loading Overlay ────────────────────────────────────────── */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--bg-root);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden { opacity: 0; visibility: hidden; }

.loader-logo {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  background: var(--grad-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: loader-pulse 1.5s ease-in-out infinite;
}

@keyframes loader-pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.6; transform: scale(0.97); }
}