/* Ringmast4r's Emporium — Dark Hacker Theme */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&family=Inter:wght@300;400;500;600;700&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0a;
  --bg-card: #111111;
  --bg-hover: #1a1a1a;
  --bg-input: #151515;
  --border: #222222;
  --border-glow: #00ff8840;
  --primary: #00ff88;
  --primary-dim: #00cc6a;
  --primary-bg: #00ff8810;
  --accent: #00aaff;
  --danger: #ff4444;
  --warning: #ffaa00;
  --text: #f5f5f5;
  --text-dim: #d0d0d0;
  --text-bright: #ffffff;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', sans-serif;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

/* ── Light Mode ───────────────────────────────── */
body.light-mode {
  --bg: #f5f5f5;
  --bg-card: #ffffff;
  --bg-hover: #eeeeee;
  --bg-input: #ffffff;
  --border: #dddddd;
  --border-glow: #00aa5540;
  --primary: #00885a;
  --primary-dim: #006644;
  --primary-bg: #00885a10;
  --accent: #0077cc;
  --danger: #cc3333;
  --warning: #cc8800;
  --text: #333333;
  --text-dim: #777777;
  --text-bright: #111111;
}

body.light-mode .nav {
  background: rgba(245, 245, 245, 0.95);
}

body.light-mode .product-thumb {
  color: var(--primary);
}

/* ── Settings cog ────────────────────────────── */
.nav-settings-mobile { display: none; }

.settings-toggle {
  position: fixed;
  top: 18px;
  right: 20px;
  z-index: 201;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: all 0.3s;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.settings-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: rotate(45deg);
}

.settings-panel {
  position: fixed;
  top: 68px;
  right: 20px;
  z-index: 200;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  width: 220px;
  display: none;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.settings-panel.open {
  display: block;
}

.settings-panel h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 0.85rem;
  color: var(--text);
}

.setting-row label {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: none;
  letter-spacing: 0;
}

.toggle-switch {
  position: relative;
  width: 36px;
  height: 20px;
  background: var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s;
}

.toggle-switch.active {
  background: var(--primary);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--text-bright);
  border-radius: 50%;
  transition: left 0.3s;
}

.toggle-switch.active::after {
  left: 18px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

/* ── Nav ─────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand span { color: var(--text-dim); font-weight: 400; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-auth {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #0a0a0a;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dim);
  box-shadow: 0 0 20px var(--border-glow);
  color: #0a0a0a;
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border-color: var(--border);
}

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

.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Hero ────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 100px 24px 60px;
  max-width: 800px;
  margin: 0 auto;
  animation: heroFadeIn 1s ease forwards;
  overflow: hidden;
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero h1 {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 16px;
}

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

.hero p {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 40px;
}

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

.hero-stat .number {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.hero-stat .label {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ── Section ─────────────────────────────────── */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px;
}

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

.section-header h2 {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.section-header p {
  color: var(--text-dim);
}

/* ── Category Filter ─────────────────────────── */
.category-filter {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover, .filter-btn.active {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-bg);
}

/* ── Product Grid ────────────────────────────── */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  border-color: var(--primary);
  box-shadow: 0 0 30px var(--border-glow);
  transform: translateY(-2px);
}

.product-thumb {
  width: 100%;
  height: 180px;
  background: var(--bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  border-bottom: 1px solid var(--border);
  letter-spacing: 2px;
}

.product-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  margin-bottom: 8px;
}

.product-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.product-desc {
  font-size: 0.875rem;
  color: var(--text-dim);
  flex: 1;
  margin-bottom: 16px;
}

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

.product-price {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

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

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

.form-error {
  color: var(--danger);
  font-size: 0.8rem;
  margin-top: 6px;
}

/* ── Auth Pages ──────────────────────────────── */
.auth-container {
  max-width: 420px;
  margin: 80px auto;
  padding: 0 24px;
}

.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.auth-card h1 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.auth-card .subtitle {
  color: var(--text-dim);
  margin-bottom: 32px;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ── Dashboard ───────────────────────────────── */
.dashboard-header {
  padding: 40px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.dashboard-header h1 {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  color: var(--text-bright);
}

.dashboard-header p {
  color: var(--text-dim);
}

.dash-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.dash-tab {
  padding: 12px 20px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.dash-tab:hover { color: var(--text); }
.dash-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.purchase-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
  transition: border-color 0.2s;
}

.purchase-card:hover { border-color: var(--primary-dim); }

.purchase-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius);
  background: var(--bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.purchase-info { flex: 1; }
.purchase-info h3 { font-size: 1rem; color: var(--text-bright); }
.purchase-info p { font-size: 0.8rem; color: var(--text-dim); }

.purchase-actions {
  display: flex;
  gap: 8px;
}

/* ── Progress Bar ────────────────────────────── */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.5s ease;
}

.progress-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
  margin-top: 4px;
}

/* ── Course Viewer ───────────────────────────── */
.course-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: calc(100vh - 64px);
}

.course-sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 24px 0;
}

.course-sidebar h2 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-bright);
  padding: 0 20px;
  margin-bottom: 8px;
}

.module-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  padding: 16px 20px 8px;
  border-top: 1px solid var(--border);
}

.lesson-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  cursor: pointer;
  transition: background 0.2s;
  font-size: 0.9rem;
  color: var(--text);
}

.lesson-item:hover { background: var(--bg-hover); }
.lesson-item.active { background: var(--primary-bg); color: var(--primary); border-left: 3px solid var(--primary); }
.lesson-item.completed .lesson-check { color: var(--primary); }

.lesson-check {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
}

.lesson-item.completed .lesson-check {
  border-color: var(--primary);
  background: var(--primary-bg);
}

.course-content {
  padding: 40px;
  overflow-y: auto;
}

.course-content h1 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-bright);
  margin-bottom: 24px;
}

.course-content .lesson-body {
  max-width: 760px;
  line-height: 1.9;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

/* ── Editorial Typography (lesson content) ───── */
.lesson-body h2 {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.02em;
}

.lesson-body h2:first-child { margin-top: 0; }

.lesson-body h3 {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-bright);
  margin: 28px 0 12px;
}

.lesson-body p {
  margin: 0 0 16px;
  color: var(--text);
}

.lesson-body ul, .lesson-body ol {
  margin: 0 0 20px;
  padding-left: 24px;
}

.lesson-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.lesson-body li strong {
  color: var(--text-bright);
}

.lesson-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--primary);
}

.lesson-body pre {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 20px 0 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.lesson-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text);
}

.lesson-body blockquote {
  border-left: 3px solid var(--primary-dim);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--primary-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
  font-style: italic;
}

.lesson-body a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.lesson-body a:hover {
  color: var(--accent);
}

.lesson-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

.lesson-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.lesson-body th, .lesson-body td {
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.lesson-body th {
  background: var(--bg-card);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary);
}

.lesson-body img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 16px 0;
}

.course-content video, .course-content iframe {
  width: 100%;
  max-width: 800px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ── Product Detail ──────────────────────────── */
.product-detail {
  max-width: 800px;
  margin: 60px auto;
  padding: 0 24px;
}

.product-detail h1 {
  font-family: var(--font-mono);
  font-size: 2rem;
  color: var(--text-bright);
  margin-bottom: 12px;
}

.product-detail .meta {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.product-detail .description {
  line-height: 1.8;
  margin-bottom: 32px;
}

.price-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}

.price-box .price {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.course-outline {
  margin-top: 40px;
}

.course-outline h2 {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--text-bright);
  margin-bottom: 20px;
}

.outline-module {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.outline-module-header {
  padding: 16px 20px;
  font-weight: 600;
  color: var(--text-bright);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.outline-module-header:hover { background: var(--bg-hover); }

.outline-lessons {
  border-top: 1px solid var(--border);
  padding: 8px 0;
}

.outline-lesson {
  padding: 10px 20px 10px 40px;
  font-size: 0.9rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 10px;
}

.outline-lesson .type-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--primary-bg);
  color: var(--primary);
}

/* ── Success Page ────────────────────────────── */
.success-container {
  text-align: center;
  max-width: 500px;
  margin: 120px auto;
  padding: 0 24px;
}

.success-icon {
  font-size: 4rem;
  margin-bottom: 24px;
}

.success-container h1 {
  font-family: var(--font-mono);
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 12px;
}

/* ── Footer ──────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 60px;
}

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

/* ── Alerts ──────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.alert-error {
  background: #ff444420;
  border: 1px solid #ff444440;
  color: #ff6666;
}

.alert-success {
  background: #00ff8820;
  border: 1px solid #00ff8840;
  color: var(--primary);
}

/* ── Skeleton Loading ────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius);
}

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

/* ── Terminal cursor blink ───────────────────── */
.cursor-blink::after {
  content: '_';
  animation: blink 1s step-end infinite;
  color: var(--primary);
}

@keyframes blink {
  50% { opacity: 0; }
}

@keyframes cursor-fade {
  0% { border-right-color: var(--primary); }
  50% { border-right-color: transparent; }
  100% { border-right-color: transparent; }
}

/* ── Responsive — Tablet (1024px) ────────────── */
@media (max-width: 1024px) {
  .section { padding: 40px 20px; }
  .hero { padding: 80px 20px 40px; }
  .hero h1 { font-size: 2.5rem; }
  .product-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
  .course-layout { grid-template-columns: 260px 1fr; }
  .course-sidebar { width: 260px; }
  .product-detail { padding: 0 20px; }
  .price-box .price { font-size: 2rem; }
  .stat-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .badge-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  .toast { min-width: 240px; max-width: 320px; }
  .coupon-box { max-width: 100%; }
  .notes-textarea { min-height: 100px; }
  .review-card { padding: 14px; }
}

/* ── Responsive — Small Tablet (768px) ──────── */
@media (max-width: 768px) {
  .hamburger { display: block; }
  .nav-links { display: none; }
  .nav-auth { gap: 8px; }
  .nav-settings-mobile { display: block; padding: 8px 0; border-top: 1px solid var(--border); margin-top: 8px; }
  .settings-toggle, .settings-panel { display: none !important; }
  .nav-auth .btn { padding: 6px 12px; font-size: 0.75rem; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
    z-index: 99;
  }
  .nav-links.open a { font-size: 1rem; padding: 8px 0; }
  .hero { padding: 60px 16px 32px; }
  .hero h1 { font-size: 1.75rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .hero-stat .number { font-size: 1.5rem; }
  .section { padding: 32px 16px; }
  .section-header h2 { font-size: 1.4rem; }
  .product-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-thumb { height: 140px; font-size: 2rem; }
  .product-body { padding: 16px; }
  .product-title { font-size: 1rem; }
  .category-filter { gap: 6px; }
  .filter-btn { padding: 6px 12px; font-size: 0.75rem; }
  .course-layout { grid-template-columns: 1fr; }
  .course-sidebar {
    position: fixed;
    left: -300px;
    top: 64px;
    bottom: 0;
    width: 280px;
    z-index: 50;
    transition: left 0.3s;
    background: var(--bg-card);
  }
  .course-sidebar.open { left: 0; box-shadow: 4px 0 24px rgba(0,0,0,0.5); }
  .course-content { padding: 24px 16px; }
  .course-content h1 { font-size: 1.25rem; }
  .lesson-nav { flex-direction: column; gap: 10px; }
  .lesson-nav .btn { width: 100%; justify-content: center; }
  .auth-container { margin: 40px auto; }
  .auth-card { padding: 24px; }
  .auth-card h1 { font-size: 1.25rem; }
  .product-detail { margin: 32px auto; }
  .product-detail h1 { font-size: 1.5rem; }
  .price-box { padding: 24px; }
  .price-box .price { font-size: 2rem; }
  .outline-module-header { padding: 12px 16px; font-size: 0.9rem; }
  .outline-lesson { padding: 8px 16px 8px 28px; font-size: 0.85rem; }
  .purchase-card { flex-direction: column; text-align: center; gap: 12px; padding: 16px; }
  .purchase-icon { width: 48px; height: 48px; font-size: 1.25rem; }
  .purchase-actions { width: 100%; }
  .purchase-actions .btn { width: 100%; justify-content: center; }
  .dash-tabs { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .dash-tab { white-space: nowrap; padding: 10px 16px; font-size: 0.8rem; }
  .dashboard-header { padding: 24px 16px; }
  .dashboard-header h1 { font-size: 1.4rem; }
  .stat-grid { grid-template-columns: 1fr; gap: 10px; }
  .stat-card { padding: 16px; }
  .stat-card .value { font-size: 1.5rem; }
  .badge-grid { grid-template-columns: 1fr; gap: 10px; }
  .badge-card { padding: 12px; }
  .profile-header { flex-direction: column; align-items: center; text-align: center; gap: 20px; }
  .profile-avatar { width: 80px; height: 80px; font-size: 1.5rem; }
  .legal { margin: 32px auto; padding: 0 16px; }
  .legal h1 { font-size: 1.4rem; }
  .legal h2 { font-size: 1rem; }
  .sec-table { font-size: 0.8rem; display: block; overflow-x: auto; }
  .sec-table th, .sec-table td { padding: 8px 10px; }
  .footer { padding: 24px 16px; font-size: 0.8rem; }
  .success-container { margin: 60px auto; }
  .success-container h1 { font-size: 1.5rem; }
  .substack-banner { flex-direction: column; gap: 12px; text-align: center; padding: 16px; }
  .article-grid { grid-template-columns: 1fr; gap: 16px; }
  .article-img { height: 160px; }
  .article-body { padding: 16px; }
  .article-title { font-size: 1rem; }
  /* Round 2 mobile */
  .toast-container { top: 70px; right: 10px; left: 10px; }
  .toast { min-width: auto; max-width: 100%; }
  .toast-icon { font-size: 1.1rem; }
  .toast-message { font-size: 0.8rem; }
  .coupon-box { flex-direction: column; max-width: 100%; }
  .coupon-box input { width: 100%; }
  .star-rating .star { font-size: 1.3rem; min-width: 32px; min-height: 32px; display: inline-flex; align-items: center; justify-content: center; }
  .review-card { padding: 12px; }
  .review-header { flex-direction: column; gap: 4px; }
  .notes-textarea { min-height: 80px; font-size: 16px; } /* 16px prevents iOS zoom */
  .notes-section h3 { font-size: 0.8rem; }
  .product-card.coming-soon .product-thumb::after { font-size: 0.6rem; bottom: 8px; right: 8px; }
  .avatar-upload .avatar-overlay { font-size: 0.6rem; opacity: 0.7; } /* always show on touch */
}

/* ── Responsive — Phone (480px) ─────────────── */
@media (max-width: 480px) {
  .nav { padding: 0 12px; }
  .nav-brand { font-size: 1rem; }
  .nav-brand span { display: none; }
  .hero { padding: 48px 12px 24px; }
  .hero h1 { font-size: 1.4rem; }
  .hero p { font-size: 0.9rem; margin-bottom: 20px; }
  .hero-stats { gap: 16px; }
  .hero-stat .number { font-size: 1.25rem; }
  .hero-stat .label { font-size: 0.75rem; }
  .section { padding: 24px 12px; }
  .section-header h2 { font-size: 1.2rem; }
  .section-header p { font-size: 0.85rem; }
  .category-filter { gap: 4px; }
  .filter-btn { padding: 5px 10px; font-size: 0.7rem; }
  .product-thumb { height: 120px; font-size: 1.75rem; }
  .product-body { padding: 12px; }
  .product-category { font-size: 0.65rem; }
  .product-title { font-size: 0.95rem; }
  .product-desc { font-size: 0.8rem; margin-bottom: 12px; }
  .product-price { font-size: 1.1rem; }
  .btn { padding: 8px 16px; font-size: 0.8rem; }
  .btn-lg { padding: 12px 24px; font-size: 0.9rem; }
  .btn-sm { padding: 5px 10px; font-size: 0.75rem; }
  .form-input { padding: 10px 12px; font-size: 0.9rem; }
  .form-group label { font-size: 0.75rem; }
  .auth-container { margin: 24px auto; padding: 0 12px; }
  .auth-card { padding: 20px; }
  .auth-card h1 { font-size: 1.1rem; }
  .auth-card .subtitle { font-size: 0.85rem; margin-bottom: 24px; }
  .course-sidebar { width: 260px; }
  .course-content { padding: 16px 12px; }
  .course-content h1 { font-size: 1.1rem; }
  .module-title { padding: 12px 16px 6px; font-size: 0.75rem; }
  .lesson-item { padding: 8px 16px; font-size: 0.85rem; }
  .product-detail { margin: 24px auto; }
  .product-detail h1 { font-size: 1.3rem; }
  .product-detail .description { font-size: 0.9rem; }
  .price-box { padding: 20px; }
  .price-box .price { font-size: 1.75rem; }
  .dashboard-header { padding: 20px 12px; }
  .dashboard-header h1 { font-size: 1.2rem; }
  .purchase-info h3 { font-size: 0.9rem; }
  .purchase-info p { font-size: 0.75rem; }
  .progress-bar { height: 4px; }
  .progress-text { font-size: 0.7rem; }
  .legal { padding: 0 12px; margin: 24px auto; }
  .legal h1 { font-size: 1.2rem; }
  .legal p, .legal li { font-size: 0.85rem; line-height: 1.7; }
  .sec-table th, .sec-table td { padding: 6px 8px; font-size: 0.75rem; }
  .footer { padding: 20px 12px; font-size: 0.75rem; }
  .empty-state { padding: 40px 16px; }
  .empty-state h3 { font-size: 0.95rem; }
  .article-img { height: 140px; }
  .article-date { font-size: 0.7rem; }
  .article-title { font-size: 0.95rem; }
  .article-excerpt { font-size: 0.8rem; }
  /* Round 2 phone */
  .toast-container { top: auto; bottom: 12px; right: 8px; left: 8px; }
  .toast { padding: 12px 14px; }
  .toast-title { font-size: 0.7rem; }
  .toast-message { font-size: 0.75rem; }
  .toast-icon { font-size: 1rem; }
  .star-rating .star { font-size: 1.4rem; min-width: 36px; min-height: 36px; }
  .coupon-box { gap: 6px; }
  .coupon-box input { font-size: 0.75rem; padding: 8px 10px; }
  .review-body { font-size: 0.8rem; }
  .review-author { font-size: 0.75rem; }
  .notes-textarea { min-height: 60px; }
  .loading-spinner { padding: 40px 16px; }
  .spinner { width: 24px; height: 24px; }
  .loading-spinner .loading-text { font-size: 0.7rem; }
}

/* ── Touch-friendly enhancements ─────────────── */
@media (hover: none) and (pointer: coarse) {
  .product-card:hover { transform: none; box-shadow: none; }
  .product-card:active { border-color: var(--primary); }
  .btn:active { transform: scale(0.97); }
  .lesson-item { min-height: 44px; }
  .filter-btn { min-height: 36px; }
  .nav-links.open a { min-height: 44px; display: flex; align-items: center; }
  .form-input { font-size: 16px; } /* prevents iOS zoom on focus */
  .notes-textarea { font-size: 16px; }
  .coupon-box input { font-size: 16px; }
  .star-rating .star { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .avatar-upload .avatar-overlay { opacity: 0.6; } /* always visible on touch devices */
  .toast { min-height: 44px; }
  /* Nav icons: ensure 44px touch targets */
  .nav-auth span { min-width: 44px; min-height: 44px; display: inline-flex !important; align-items: center; justify-content: center; }
}

/* ── Nav icons responsive ──────────────────────── */
@media (max-width: 768px) {
  .nav-auth { gap: 6px !important; }
  .nav-auth .btn-sm { padding: 6px 10px; font-size: 0.7rem; }
  /* Notification/search panels full width on mobile */
  #notifPanel, #searchPanel { left: 8px !important; right: 8px !important; width: auto !important; }
  #searchPanel input { font-size: 16px !important; } /* prevent iOS zoom */
}

@media (max-width: 480px) {
  .nav-auth .btn-sm { padding: 5px 8px; font-size: 0.65rem; }
  #notifPanel, #searchPanel { top: 56px !important; }
}

/* ── Empty State ─────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-dim);
}

.empty-state .icon { font-size: 3rem; margin-bottom: 16px; }

/* ── Coming Soon ────────────────────────────── */
.product-card.coming-soon {
  opacity: 0.45;
  cursor: default;
  filter: grayscale(40%);
  pointer-events: none;
}
.product-card.coming-soon .product-thumb {
  position: relative;
}
.product-card.coming-soon .product-thumb::after {
  content: '// COMING SOON';
  position: absolute;
  bottom: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--warning);
  letter-spacing: 1px;
}
.product-card.coming-soon:hover {
  border-color: var(--border);
  box-shadow: none;
  transform: none;
}
.product-card.coming-soon .product-price {
  color: var(--warning);
  font-size: 0.9rem;
}

/* ── Toast Notifications ────────────────────── */
.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 16px 20px;
  min-width: 280px;
  max-width: 380px;
  box-shadow: 0 8px 32px rgba(0, 255, 136, 0.15), 0 4px 16px rgba(0, 0, 0, 0.4);
  animation: toastSlideIn 0.4s ease forwards;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.toast.toast-exit {
  animation: toastSlideOut 0.3s ease forwards;
}
.toast-icon {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--primary);
  flex-shrink: 0;
}
.toast-body {
  flex: 1;
}
.toast-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}
.toast-message {
  font-size: 0.85rem;
  color: var(--text);
}
@keyframes toastSlideIn {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes toastSlideOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(120%); opacity: 0; }
}

/* ── Loading Spinner ────────────────────────── */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  gap: 16px;
}
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.loading-spinner .loading-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ── Star Rating ────────────────────────────── */
.star-rating {
  display: inline-flex;
  gap: 2px;
}
.star-rating .star {
  font-size: 1.1rem;
  color: var(--border);
  cursor: pointer;
  transition: color 0.15s;
  user-select: none;
}
.star-rating .star.filled {
  color: var(--warning);
}
.star-rating .star:hover,
.star-rating .star.hover {
  color: var(--warning);
}
.star-rating-display {
  display: inline-flex;
  gap: 1px;
  font-size: 0.85rem;
}
.star-rating-display .star {
  color: var(--border);
}
.star-rating-display .star.filled {
  color: var(--warning);
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.review-author {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
}
.review-date {
  font-size: 0.75rem;
  color: var(--text-dim);
}
.review-body {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
}

/* ── Student Notes ──────────────────────────── */
.notes-section {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.notes-section h3 {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}
.notes-textarea {
  width: 100%;
  min-height: 120px;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  resize: vertical;
  transition: border-color 0.2s;
}
.notes-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}
.notes-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 6px;
  min-height: 16px;
}
.notes-status.saved { color: var(--primary); }

/* ── Coupon Box ─────────────────────────────── */
.coupon-box {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}
.coupon-box input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
}
.coupon-box input:focus {
  outline: none;
  border-color: var(--primary);
}
.coupon-result {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-top: 8px;
  text-align: center;
  min-height: 20px;
}
.coupon-result.success { color: var(--primary); }
.coupon-result.error { color: var(--danger); }

/* ── Avatar ─────────────────────────────────── */
.avatar-upload {
  position: relative;
  cursor: pointer;
}
.avatar-upload input[type="file"] {
  display: none;
}
.avatar-upload .avatar-overlay {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-bright);
}
.avatar-upload:hover .avatar-overlay {
  opacity: 1;
}
.profile-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}
.empty-state h3 { color: var(--text); margin-bottom: 8px; }