/**
 * Sounny.github.io - Modern Zero-Dependency Design System
 * Dr. Moulay Anwar Sounny-Slitine
 * Standards: Titanium Glassmorphism & High-Performance Pure CSS
 */

:root {
  /* Color Palette - Titanium Dark & Luminous Cyan/Blue */
  --bg-base: #0a0e17;
  --bg-surface: #101726;
  --bg-surface-elevated: #172136;
  --bg-glass: rgba(16, 23, 38, 0.72);
  --bg-glass-card: rgba(20, 30, 48, 0.55);
  --bg-glass-hover: rgba(30, 45, 72, 0.75);

  --primary: #38bdf8;
  --primary-light: #7dd3fc;
  --primary-dark: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.35);

  --secondary: #34d399;
  --secondary-glow: rgba(52, 211, 153, 0.3);

  --accent: #a78bfa;
  --accent-glow: rgba(167, 139, 250, 0.25);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-luminous: rgba(56, 189, 248, 0.22);
  --border-luminous-hover: rgba(56, 189, 248, 0.65);

  /* Typography */
  --font-sans: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Space Grotesk", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Geometry & Shadows */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.45);
  --shadow-glass: 0 12px 40px -10px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  --shadow-glow: 0 0 25px var(--primary-glow);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1240px;
}

/* Base Reset & Smooth Scroll */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(52, 211, 153, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(167, 139, 250, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Accessibility & Screen Reader */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

p {
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.mono {
  font-family: var(--font-mono);
}

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

a:hover {
  color: var(--primary-light);
}

/* Buttons & Badges */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #04101e !important;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  color: #04101e !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.5);
}

.btn-outline {
  background: rgba(16, 23, 38, 0.6);
  border-color: var(--border-luminous);
  color: var(--primary);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
  letter-spacing: 0.03em;
}

.badge-secondary {
  background: rgba(52, 211, 153, 0.12);
  color: var(--secondary);
  border-color: rgba(52, 211, 153, 0.25);
}

.badge-accent {
  background: rgba(167, 139, 250, 0.12);
  color: var(--accent);
  border-color: rgba(167, 139, 250, 0.25);
}

/* Glassmorphic Card Surface */
.glass-card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(14px) saturate(1.8);
  -webkit-backdrop-filter: blur(14px) saturate(1.8);
  border: 1px solid var(--border-luminous);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glass);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  pointer-events: none;
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-luminous-hover);
  box-shadow: 0 16px 40px -8px rgba(0, 0, 0, 0.7), 0 0 20px rgba(56, 189, 248, 0.2);
}

/* Sticky Glass Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-luminous);
  transition: all var(--transition-normal);
  padding: 0.85rem 0;
}

.navbar-scrolled {
  background: rgba(10, 14, 23, 0.96);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
  padding: 0.65rem 0;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
}

.nav-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  object-position: 50% 15%;
  border: 2px solid var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.35rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--primary);
}

.nav-ext-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.95rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--border-luminous);
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
}

.nav-ext-btn:hover {
  background: var(--primary);
  color: #04101e;
  border-color: var(--primary);
}

/* Mobile Nav Toggle Button */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* Hero Masthead */
.masthead {
  position: relative;
  padding: 6.5rem 0 5rem 0;
  background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.12) 0%, transparent 60%);
  text-align: center;
  overflow: hidden;
}

.masthead-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  background: rgba(16, 23, 38, 0.8);
  border: 1px solid var(--border-luminous);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.masthead-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #ffffff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.masthead-typed-wrap {
  min-height: 2.5rem;
  margin-bottom: 2rem;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.5vw, 1.65rem);
  color: var(--text-main);
}

.typed-text {
  color: var(--primary);
  font-weight: 600;
}

.typed-cursor {
  display: inline-block;
  margin-left: 2px;
  color: var(--primary);
  font-weight: 400;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  from, to { opacity: 1; }
  50% { opacity: 0; }
}

.masthead-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Quick Metrics / Stats Bar */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.25rem;
  max-width: 860px;
  margin: 0 auto;
}

.stat-card {
  padding: 1.25rem 1rem;
  text-align: center;
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-luminous);
  border-radius: var(--radius-md);
}

.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* Section Header */
.section {
  padding: 5rem 0;
  position: relative;
}

.section-alt {
  background: rgba(16, 23, 38, 0.4);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 0.6rem;
}

.section-title {
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Responsive Bento Grids */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.bento-grid-wide {
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
}

/* App & Feature Cards */
.card-inner {
  padding: 1.75rem;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.35rem;
  transition: all var(--transition-fast);
}

.glass-card:hover .card-icon {
  background: var(--primary);
  color: #04101e;
  box-shadow: 0 0 16px var(--primary-glow);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-bottom {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Category Filter Tabs for Web Apps */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background: rgba(16, 23, 38, 0.6);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-main);
  border-color: var(--border-luminous);
  background: rgba(56, 189, 248, 0.08);
}

.filter-btn.active {
  background: var(--primary);
  color: #04101e;
  border-color: var(--primary);
  font-weight: 700;
  box-shadow: 0 0 14px var(--primary-glow);
}

.search-input-wrap {
  max-width: 420px;
  margin: 0 auto 2rem auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  background: rgba(16, 23, 38, 0.7);
  border: 1px solid var(--border-luminous);
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 16px var(--primary-glow);
  background: rgba(20, 30, 48, 0.9);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  font-size: 0.95rem;
  pointer-events: none;
}

/* Lesson Cards with Thumbnails */
.lesson-card {
  display: flex;
  flex-direction: column;
}

.lesson-thumb-wrap {
  position: relative;
  width: 100%;
  height: 180px;
  background: #0f172a;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.lesson-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.glass-card:hover .lesson-thumb {
  transform: scale(1.05);
}

.lesson-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
}

/* Must-Haves / Resource Links Grid */
.resource-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.resource-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
}

.resource-icon {
  font-size: 1.5rem;
  color: var(--primary);
  margin-top: 0.15rem;
  flex-shrink: 0;
}

.resource-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.resource-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Contact Grid */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  max-width: 980px;
  margin: 0 auto;
}

.contact-card {
  padding: 1.75rem 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.contact-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid var(--border-luminous);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.4rem;
  margin-bottom: 1rem;
  transition: all var(--transition-fast);
}

.contact-card:hover .contact-icon {
  background: var(--primary);
  color: #04101e;
  box-shadow: 0 0 20px var(--primary-glow);
}

.contact-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.contact-handle {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--primary);
  word-break: break-all;
}

/* Footer */
.footer {
  background: rgba(8, 11, 18, 0.95);
  border-top: 1px solid var(--border-luminous);
  padding: 3.5rem 0 2.5rem 0;
  text-align: center;
}

.footer-quote {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 0.75rem;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Mobile Responsiveness */
@media (max-width: 991px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-luminous);
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 1.25rem;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .masthead {
    padding: 4.5rem 0 3.5rem 0;
  }

  .section {
    padding: 3.5rem 0;
  }

  .bento-grid {
    grid-template-columns: 1fr;
  }
}