/* ==========================================================================
   NovaPortfolio - Premium Creative Developer & Designer Portfolio CSS
   Theme: Light Mode (Default) with Dark Mode Support
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Variables & Design System
   -------------------------------------------------------------------------- */
:root {
  /* Light Theme Colors (Default) */
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-card: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.85);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;

  /* Accent Colors */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-glow: rgba(37, 99, 235, 0.15);

  --secondary: #7c3aed;
  --secondary-light: #ede9fe;

  --emerald: #10b981;
  --emerald-light: #d1fae5;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 16px 32px -4px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.2);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Layout */
  --container-width: 1140px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode Override (User toggled) */
[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-surface: #111827;
  --bg-subtle: #1f2937;
  --bg-card: #141d2e;
  --bg-header: rgba(17, 24, 39, 0.85);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --text-inverse: #0f172a;

  --border-color: #1f293d;
  --border-hover: #334155;

  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: rgba(59, 130, 246, 0.15);
  --primary-glow: rgba(59, 130, 246, 0.25);

  --secondary: #8b5cf6;
  --secondary-light: rgba(139, 92, 246, 0.15);

  --emerald: #34d399;
  --emerald-light: rgba(52, 211, 153, 0.15);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -4px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.3);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
  -webkit-font-smoothing: antialiased;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

img, svg {
  display: block;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.875rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   3. Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-smooth);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-badge {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.95rem;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  border-radius: 2px;
  transition: width var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.theme-toggle-btn {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--primary);
  border-color: var(--primary);
}

.mobile-toggle-btn {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-main);
  align-items: center;
  justify-content: center;
}

/* --------------------------------------------------------------------------
   4. Buttons & UI Elements
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-smooth);
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

.btn-sm {
  padding: 0.5rem 0.95rem;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   5. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: 6rem 0 5rem;
  overflow: hidden;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 4rem;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background-color: var(--emerald-light);
  color: var(--emerald);
  font-size: 0.8125rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-social-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero-social-link {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.hero-social-link:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* Hero Visual Card */
.hero-visual {
  position: relative;
}

.profile-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 2;
  transition: transform var(--transition-smooth);
}

.profile-card:hover {
  transform: translateY(-5px);
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.profile-avatar {
  width: 4.5rem;
  height: 4.5rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: white;
  font-weight: 800;
  box-shadow: 0 8px 16px rgba(59, 130, 246, 0.2);
}

.profile-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.profile-info p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.profile-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  text-align: center;
}

.profile-stat-box {
  background-color: var(--bg-subtle);
  padding: 0.875rem 0.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.stat-number {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  font-family: inherit;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Ambient Accent Glow behind card */
.hero-glow-shape {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  filter: blur(40px);
  z-index: 1;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   6. About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.about-text h3 {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 1.25rem;
}

.about-text p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 1rem;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}

.about-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
}

.feature-icon-box {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.about-feature-item h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.about-feature-item p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.about-card-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.code-snippet {
  background-color: #0d1117;
  color: #e6edf3;
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8125rem;
  line-height: 1.6;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow-x: auto;
}

.code-keyword { color: #ff7b72; }
.code-var { color: #79c0ff; }
.code-str { color: #a5d6ff; }
.code-func { color: #d2a8ff; }
.code-comment { color: #8b949e; }

/* --------------------------------------------------------------------------
   7. Skills & Tech Stack Section
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

.skill-category-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
}

.skill-category-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.skill-category-header {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.skill-category-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-category-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background-color: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

/* --------------------------------------------------------------------------
   8. Projects Section (Filtering & Cards)
   -------------------------------------------------------------------------- */
.project-filters {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.filter-btn.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

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

.project-thumb {
  height: 200px;
  background: linear-gradient(135deg, var(--bg-subtle), var(--border-color));
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.project-thumb-graphic {
  width: 80%;
  height: 75%;
  background-color: var(--bg-surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 0.75rem;
  gap: 0.5rem;
  transition: transform var(--transition-smooth);
}

.project-card:hover .project-thumb-graphic {
  transform: scale(1.04);
}

.mockup-bar {
  display: flex;
  gap: 4px;
}
.mockup-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--border-color);
}

.mockup-content {
  flex: 1;
  border-radius: 4px;
  background: var(--bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-light);
}

.project-body {
  padding: 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.project-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.65rem;
}

.project-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.tech-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-subtle);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
}

.project-links {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.project-btn-detail {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.project-btn-detail:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   9. Experience Timeline Section
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0.75rem;
  width: 2px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 0.25rem;
  width: 1.625rem;
  height: 1.625rem;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 3px solid var(--primary);
  box-shadow: 0 0 0 4px var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.timeline-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.timeline-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.timeline-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-role {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
}

.timeline-period {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--primary);
  background-color: var(--primary-light);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.timeline-company {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   10. Contact Section
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 3.5rem;
  align-items: flex-start;
}

.contact-info-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-md);
}

.contact-info-card h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.contact-info-card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-channel-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.contact-channel-item:hover {
  border-color: var(--primary);
}

.channel-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.channel-details h4 {
  font-size: 0.8125rem;
  color: var(--text-light);
  font-weight: 600;
}

.channel-details span {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
}

.copy-btn {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Form Styles */
.contact-form-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

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

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1.15rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

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

textarea.form-control {
  resize: vertical;
  min-height: 130px;
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  background-color: var(--bg-surface);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

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

/* --------------------------------------------------------------------------
   12. Modal & Toast Notifications
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: scale(0.95);
  transition: transform var(--transition-smooth);
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1100;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.35rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transform: translateY(100px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-smooth);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.toast-icon {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background-color: var(--emerald-light);
  color: var(--emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Floating Scroll to Top Button */
.scroll-top-btn {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  z-index: 90;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-smooth);
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
}

.scroll-top-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* --------------------------------------------------------------------------
   13. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    max-width: 480px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 4.5rem;
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.mobile-open {
    display: flex;
  }

  .mobile-toggle-btn {
    display: flex;
  }

  .hero-title {
    font-size: 2.35rem;
  }

  .section {
    padding: 4rem 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .about-features {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .profile-stats {
    grid-template-columns: 1fr;
  }
}