/* ============================================
   CryptoSkill - Apple-Inspired Design System
   ============================================ */

/* --- Custom Properties (Dark Mode - Default) --- */
:root {
  --bg-primary: hsl(0 0% 0%);
  --bg-card: rgba(28, 28, 30, 0.72);
  --bg-card-hover: rgba(38, 38, 40, 0.8);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(255, 255, 255, 0.15);
  --primary: hsl(210 100% 50%);
  --primary-rgb: 10, 132, 255;
  --text-primary: hsl(0 0% 98%);
  --text-secondary: hsl(0 0% 55%);
  --text-tertiary: hsl(0 0% 35%);
  --success: hsl(142 72% 46%);
  --border: hsl(0 0% 15%);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration: 300ms;
  --transition: var(--duration) var(--ease);
  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", system-ui, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", ui-monospace, monospace;
  --max-width: 1200px;
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), 0 0 1px rgba(255, 255, 255, 0.05) inset;
  --navbar-bg: rgba(0, 0, 0, 0.8);
  --search-bg: rgba(28, 28, 30, 0.95);
  --modal-bg: rgba(28, 28, 30, 0.95);
  --overlay-bg: rgba(0, 0, 0, 0.7);
  --code-bg: rgba(0, 0, 0, 0.5);
  --kbd-bg: rgba(255, 255, 255, 0.06);
  --subtle-bg: rgba(255, 255, 255, 0.04);
  --subtle-bg-hover: rgba(255, 255, 255, 0.06);
  --subtle-bg-active: rgba(255, 255, 255, 0.1);
  --scrollbar-thumb: rgba(255, 255, 255, 0.1);
  --icon-bg: rgba(255, 255, 255, 0.06);
}

/* --- Light Mode --- */
[data-theme="light"] {
  --bg-primary: hsl(0 0% 98%);
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --card-border: rgba(0, 0, 0, 0.08);
  --card-border-hover: rgba(0, 0, 0, 0.15);
  --text-primary: hsl(0 0% 8%);
  --text-secondary: hsl(0 0% 40%);
  --text-tertiary: hsl(0 0% 55%);
  --border: hsl(0 0% 88%);
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --navbar-bg: rgba(255, 255, 255, 0.85);
  --search-bg: rgba(255, 255, 255, 0.98);
  --modal-bg: rgba(255, 255, 255, 0.98);
  --overlay-bg: rgba(0, 0, 0, 0.4);
  --code-bg: rgba(0, 0, 0, 0.04);
  --kbd-bg: rgba(0, 0, 0, 0.05);
  --subtle-bg: rgba(0, 0, 0, 0.03);
  --subtle-bg-hover: rgba(0, 0, 0, 0.05);
  --subtle-bg-active: rgba(0, 0, 0, 0.08);
  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
  --icon-bg: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .hero-glow {
  background: radial-gradient(ellipse at top, hsla(210 100% 50% / 0.06), transparent 60%);
}

[data-theme="light"] .official-project-card:hover,
[data-theme="light"] .skill-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .search-overlay {
  background: var(--overlay-bg);
}

[data-theme="light"] .search-container {
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .modal-overlay {
  background: var(--overlay-bg);
}

[data-theme="light"] .modal {
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .btn-primary {
  box-shadow: 0 0 20px rgba(var(--primary-rgb), 0.2);
}

[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 0 30px rgba(var(--primary-rgb), 0.35);
}

[data-theme="light"] .official-badge,
[data-theme="light"] .search-result-item .result-badge.official,
[data-theme="light"] .skill-badge.official-tag,
[data-theme="light"] .modal-official-badge {
  background: rgba(34, 197, 94, 0.1);
}

[data-theme="light"] .filter-btn.active {
  box-shadow: 0 0 12px rgba(var(--primary-rgb), 0.2);
}

[data-theme="light"] .install-cmd {
  background: var(--code-bg);
  border-color: var(--card-border);
}

[data-theme="light"] .install-cmd .copy-btn {
  background: var(--subtle-bg);
  border-color: var(--card-border);
}

[data-theme="light"] .install-cmd .copy-btn:hover {
  background: var(--subtle-bg-active);
}

[data-theme="light"] ::selection {
  background: rgba(10, 132, 255, 0.2);
}

[data-theme="light"] .nav-links a {
  color: var(--text-secondary);
}

[data-theme="light"] @media (max-width: 768px) {
  .nav-links {
    background: rgba(255, 255, 255, 0.95);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-stack);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

/* --- Selection --- */
::selection {
  background: rgba(10, 132, 255, 0.3);
  color: var(--text-primary);
}

/* --- Links --- */
a {
  color: inherit;
  text-decoration: none;
}

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ============================================
   Theme Toggle
   ============================================ */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  margin-left: 8px;
}

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

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 18px;
  height: 18px;
  transition: opacity 0.2s ease, transform 0.3s ease;
}

/* Dark mode (default): show sun icon, hide moon */
.theme-toggle .icon-sun {
  display: block;
}

.theme-toggle .icon-moon {
  display: none;
}

/* Light mode: show moon icon, hide sun */
[data-theme="light"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  background: var(--navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
  transition: background var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav-logo svg {
  width: 28px;
  height: 28px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  letter-spacing: -0.01em;
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-search-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  color: var(--text-tertiary);
  font-size: 13px;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: all var(--transition);
}

.nav-search-btn:hover {
  border-color: var(--card-border-hover);
  color: var(--text-secondary);
}

.nav-search-btn kbd {
  font-family: var(--font-stack);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--kbd-bg);
  border: 1px solid var(--card-border);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  padding: 160px 0 100px;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 600px;
  background: radial-gradient(ellipse at top, hsla(210 100% 50% / 0.08), transparent 60%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  box-shadow: var(--card-shadow);
  animation: fadeInUp 0.6s var(--ease) both;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s var(--ease) 0.1s both;
}

.hero h1 .accent {
  color: var(--primary);
}

.hero .subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: 1.6;
  letter-spacing: -0.01em;
  animation: fadeInUp 0.6s var(--ease) 0.2s both;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  animation: fadeInUp 0.6s var(--ease) 0.3s both;
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  background: var(--primary);
  color: white;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-stack);
  letter-spacing: -0.01em;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 0 20px rgba(var(--primary-rgb), 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(var(--primary-rgb), 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  font-family: var(--font-stack);
  letter-spacing: -0.01em;
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--card-shadow);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--card-border-hover);
  transform: translateY(-1px);
}

/* ============================================
   Stats Bar
   ============================================ */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  padding: 32px 0;
  animation: fadeInUp 0.6s var(--ease) 0.4s both;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.stat-label {
  font-size: 13px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

/* ============================================
   Search Overlay
   ============================================ */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  background: var(--overlay-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.search-container {
  width: 100%;
  max-width: 640px;
  background: var(--search-bg);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transform: translateY(-10px) scale(0.98);
  transition: all var(--transition);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.search-overlay.active .search-container {
  transform: translateY(0) scale(1);
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--card-border);
}

.search-input-wrap svg {
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

#searchInput {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-size: 16px;
  font-family: var(--font-stack);
  color: var(--text-primary);
}

#searchInput::placeholder {
  color: var(--text-tertiary);
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: 8px;
}

.search-results::-webkit-scrollbar {
  width: 6px;
}

.search-results::-webkit-scrollbar-track {
  background: transparent;
}

.search-results::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
}

.search-result-item:hover {
  background: var(--bg-card-hover);
}

.search-result-item .result-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.search-result-item .result-info {
  flex: 1;
  min-width: 0;
}

.search-result-item .result-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.search-result-item .result-desc {
  font-size: 12px;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-item .result-badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-weight: 500;
  flex-shrink: 0;
}

.search-result-item .result-badge.official {
  background: rgba(34, 197, 94, 0.12);
  color: var(--success);
}

.search-result-item .result-badge.community {
  background: var(--subtle-bg);
  color: var(--text-tertiary);
}

.search-result-item .result-category {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg);
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.search-empty {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-tertiary);
  font-size: 14px;
}

.search-hint {
  padding: 12px 16px;
  border-top: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.search-hint span {
  font-size: 12px;
  color: var(--text-tertiary);
}

.search-hint kbd {
  font-family: var(--font-stack);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--kbd-bg);
  border: 1px solid var(--card-border);
  color: var(--text-tertiary);
}

/* ============================================
   Section Styles
   ============================================ */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================
   Official Skills Section
   ============================================ */
.official-section {
  padding: 100px 0;
  position: relative;
}

.official-section .section-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.official-section .section-title-row h2 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.official-total-count {
  text-align: center;
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 8px;
  margin-bottom: 0;
}

.official-total-count strong {
  color: var(--text-primary);
  font-weight: 600;
}

.verified-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  flex-shrink: 0;
}

.verified-badge svg {
  width: 18px;
  height: 18px;
}

.official-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.official-project-card {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--card-shadow);
}

.official-project-card:hover {
  border-color: var(--card-border-hover);
  transform: scale(1.01);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

.official-project-card.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), 0 4px 16px rgba(var(--primary-rgb), 0.15);
}

.official-card-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.official-project-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--icon-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  flex-shrink: 0;
}

.official-project-info {
  flex: 1;
  min-width: 0;
}

.official-project-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 2px;
}

.official-project-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 12px;
}

.official-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(34, 197, 94, 0.12);
  color: var(--success);
}

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

.official-skill-count {
  font-size: 14px;
  color: var(--text-secondary);
}

.official-skill-count strong {
  color: var(--text-primary);
  font-weight: 600;
}

.official-github-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-tertiary);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
}

.official-github-link:hover {
  border-color: var(--card-border-hover);
  color: var(--text-secondary);
}

.official-github-link svg {
  width: 14px;
  height: 14px;
}

/* Skill preview pills inside official cards */
.official-skill-previews {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.official-skill-preview-tag {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg);
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.official-view-all-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--primary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: var(--font-stack);
  transition: opacity var(--transition);
}

.official-view-all-btn:hover {
  opacity: 0.8;
}

.official-view-all-btn svg {
  width: 12px;
  height: 12px;
}

/* Official skills detail grid (shows when a project card is clicked) */
.official-skills-detail {
  margin-top: 32px;
  display: none;
}

.official-skills-detail.active {
  display: block;
}

.official-skills-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.official-skills-detail-header h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.official-skills-detail-close {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  font-size: 13px;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: all var(--transition);
}

.official-skills-detail-close:hover {
  border-color: var(--card-border-hover);
  color: var(--text-primary);
}

.official-skills-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

/* ============================================
   Categories Grid
   ============================================ */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.category-card {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--card-shadow);
}

.category-card:hover {
  border-color: var(--card-border-hover);
  transform: scale(1.01);
}

.category-icon {
  font-size: 32px;
  margin-bottom: 16px;
  display: block;
}

.category-name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.category-desc {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.category-count {
  font-size: 12px;
  color: var(--text-tertiary);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg);
  display: inline-block;
}

/* ============================================
   Community Skills (formerly Featured Skills)
   ============================================ */
.skills-filter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--card-shadow);
}

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

.filter-btn.active {
  background: var(--primary);
  border-color: transparent;
  color: white;
  box-shadow: 0 0 12px rgba(var(--primary-rgb), 0.3);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.skill-card {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--card-shadow);
}

.skill-card:hover {
  border-color: var(--card-border-hover);
  transform: scale(1.01);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

.skill-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.skill-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.skill-badge {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(var(--primary-rgb), 0.12);
  color: var(--primary);
  font-weight: 500;
  white-space: nowrap;
}

.skill-badge.official-tag {
  background: rgba(34, 197, 94, 0.12);
  color: var(--success);
}

.skill-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.skill-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.skill-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.skill-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg);
  color: var(--text-tertiary);
}

.skill-version {
  font-size: 11px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.skills-show-more {
  text-align: center;
  margin-top: 40px;
}

/* ============================================
   How It Works
   ============================================ */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.how-card {
  text-align: center;
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
  box-shadow: var(--card-shadow);
}

.how-card:hover {
  border-color: var(--card-border-hover);
  transform: scale(1.01);
}

.how-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  font-size: 18px;
  font-weight: 700;
  color: white;
  margin-bottom: 24px;
}

.how-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.how-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   Install Section - Polished Segmented Control
   ============================================ */
.install-section {
  text-align: center;
}

.install-box {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px;
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}

/* Segmented control (Apple-style pill group) */
.install-tabs {
  display: inline-flex;
  gap: 0;
  margin-bottom: 24px;
  padding: 3px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg);
  border: 1px solid var(--card-border);
  flex-wrap: wrap;
}

.install-tab {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: all 0.25s var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.install-tab:hover {
  color: var(--text-primary);
}

.install-tab.active {
  background: var(--primary);
  border-color: transparent;
  color: white;
  box-shadow: 0 1px 4px rgba(var(--primary-rgb), 0.3);
}

.install-tab .tab-icon {
  font-size: 14px;
  line-height: 1;
}

/* Install panels with animation */
.install-panel {
  animation: installPanelIn 0.3s var(--ease) both;
}

@keyframes installPanelIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.install-cmd {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--code-bg);
  border: 1px solid var(--card-border);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--primary);
  margin-bottom: 10px;
  text-align: left;
}

.install-cmd .prompt {
  color: var(--text-tertiary);
  user-select: none;
}

.install-cmd code {
  flex: 1;
  overflow-x: auto;
}

.install-cmd .copy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--subtle-bg-hover);
  border: 1px solid var(--card-border);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.install-cmd .copy-btn:hover {
  background: var(--subtle-bg-active);
  color: var(--text-primary);
}

.install-cmd .copy-btn.copied {
  color: var(--success);
}

.install-panel-note {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 10px;
  text-align: left;
  padding: 0 4px;
  line-height: 1.5;
}

.install-note {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 16px;
}

/* ============================================
   Submit Section
   ============================================ */
.submit-section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.submit-section .section-header {
  margin-bottom: 48px;
}

.submit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.submit-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  transition: all var(--transition);
}

.submit-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-2px);
}

.submit-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--icon-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.submit-card-icon svg {
  width: 24px;
  height: 24px;
}

.submit-card h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.submit-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.submit-card .btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--primary);
  color: white;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-stack);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.submit-card .btn-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 16px rgba(var(--primary-rgb), 0.3);
}

.submit-card .btn-submit-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-stack);
  border: 1px solid var(--card-border);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.submit-card .btn-submit-outline:hover {
  border-color: var(--card-border-hover);
  background: var(--subtle-bg);
}

/* Quick Submit Form */
.submit-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.submit-form .form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.submit-form label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.submit-form input,
.submit-form select,
.submit-form textarea {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  background: var(--code-bg);
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font-stack);
  outline: none;
  transition: border-color var(--transition);
}

.submit-form input:focus,
.submit-form select:focus,
.submit-form textarea:focus {
  border-color: var(--primary);
}

.submit-form input::placeholder,
.submit-form textarea::placeholder {
  color: var(--text-tertiary);
}

.submit-form select {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.submit-form textarea {
  resize: vertical;
  min-height: 60px;
}

.submit-form-note {
  font-size: 11px;
  color: var(--text-tertiary);
  line-height: 1.5;
  margin-top: 4px;
}

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

/* ============================================
   Skill Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 300;
  background: var(--overlay-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: 100%;
  max-width: 560px;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--modal-bg);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--card-border);
  padding: 32px;
  transform: translateY(10px) scale(0.98);
  transition: all var(--transition);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal::-webkit-scrollbar {
  width: 6px;
}

.modal::-webkit-scrollbar-track {
  background: transparent;
}

.modal::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 16px;
}

.modal-close:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.modal-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
  position: relative;
}

.modal-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--icon-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.modal-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.modal-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-tertiary);
  flex-wrap: wrap;
}

.modal-meta .author {
  color: var(--text-secondary);
}

.modal-official-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: rgba(34, 197, 94, 0.12);
  color: var(--success);
}

.modal-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.modal-section-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}

.modal-tag {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--subtle-bg-hover);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
}

.modal-install {
  margin-bottom: 24px;
}

.modal-install .install-cmd {
  margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--card-border);
  position: relative;
  z-index: 1;
}

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

.footer-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-text {
  font-size: 13px;
  color: var(--text-tertiary);
}

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

.footer-links a {
  font-size: 13px;
  color: var(--text-tertiary);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.footer-links a svg {
  width: 16px;
  height: 16px;
}

/* ============================================
   Legal Content Pages
   ============================================ */
.legal-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.legal-content h1 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.legal-content .legal-date {
  color: var(--text-tertiary);
  font-size: 14px;
  margin-bottom: 48px;
}

.legal-content h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 48px;
  margin-bottom: 16px;
}

.legal-content p,
.legal-content li {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.legal-content ul {
  padding-left: 24px;
}

.legal-content a {
  color: var(--primary);
  transition: opacity var(--transition);
}

.legal-content a:hover {
  opacity: 0.8;
}

.legal-content .legal-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: 32px;
  transition: color var(--transition);
}

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

.legal-content .legal-back svg {
  width: 16px;
  height: 16px;
}

.legal-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.legal-content .legal-contact {
  margin-top: 48px;
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--card-border);
}

.legal-content .legal-contact p {
  margin-bottom: 0;
}

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

.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

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

/* Staggered children */
.stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger.visible > *:nth-child(2) { transition-delay: 0.06s; }
.stagger.visible > *:nth-child(3) { transition-delay: 0.12s; }
.stagger.visible > *:nth-child(4) { transition-delay: 0.18s; }
.stagger.visible > *:nth-child(5) { transition-delay: 0.24s; }
.stagger.visible > *:nth-child(6) { transition-delay: 0.3s; }
.stagger.visible > *:nth-child(7) { transition-delay: 0.36s; }
.stagger.visible > *:nth-child(8) { transition-delay: 0.42s; }
.stagger.visible > *:nth-child(9) { transition-delay: 0.48s; }
.stagger.visible > *:nth-child(10) { transition-delay: 0.54s; }
.stagger.visible > *:nth-child(11) { transition-delay: 0.6s; }
.stagger.visible > *:nth-child(12) { transition-delay: 0.66s; }

.stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .navbar {
    padding: 0 16px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--navbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
    padding: 16px 24px;
    gap: 16px;
  }

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

  .nav-search-btn {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .theme-toggle {
    margin-left: 0;
    margin-right: 8px;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .stats-bar {
    gap: 24px;
    flex-wrap: wrap;
  }

  .stat-value {
    font-size: 28px;
  }

  .section,
  .official-section,
  .submit-section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .official-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .skills-grid,
  .official-skills-list {
    grid-template-columns: 1fr;
  }

  .how-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .search-overlay {
    padding-top: 80px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer .container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .footer-left {
    flex-direction: column;
    gap: 8px;
  }

  .modal {
    padding: 24px;
    border-radius: var(--radius-lg);
  }

  .modal-overlay {
    padding: 16px;
    align-items: flex-end;
  }

  .official-skills-detail-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

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

  .install-tabs {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .categories-grid,
  .official-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 36px;
  }

  .stat-value {
    font-size: 24px;
  }

  .stats-bar {
    gap: 16px;
  }

  .container {
    padding: 0 16px;
  }

  .install-tabs {
    gap: 0;
  }

  .install-tab {
    padding: 6px 12px;
    font-size: 12px;
  }
}