/* ========================================
   HAPPYHORSE — AI Video Generation Platform
   Layout mirrors reference site structure
   ======================================== */

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

:root {
  --bg-body: #0d0d12;
  --bg-sidebar: #111118;
  --bg-card: #18181f;
  --bg-input: #1e1e28;
  --bg-hover: #22222e;
  --border: #2a2a36;
  --border-light: #333342;
  --text-primary: #eeeef2;
  --text-secondary: #9898a8;
  --text-muted: #5c5c6e;
  --accent: #6c5ce7;
  --accent-light: #8b7cf7;
  --accent-bg: rgba(108, 92, 231, 0.08);
  --accent-border: rgba(108, 92, 231, 0.25);
  --green: #00b894;
  --orange: #fdcb6e;
  --pink: #e84393;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --transition: 0.2s ease;
  --sidebar-width: 240px;
  --topnav-height: 56px;
}

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

body {
  font-family: var(--font);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: var(--font); }

/* ---------- TOP NAVBAR ---------- */
.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topnav-height);
  background: rgba(13, 13, 18, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.topnav-inner {
  width: 100%;
  max-width: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.topnav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
}

.logo-label {
  color: var(--text-primary);
}

.topnav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex: 1;
  justify-content: center;
}

.topnav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  white-space: nowrap;
}

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

.topnav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.lang-btn:hover {
  border-color: var(--border-light);
  color: var(--text-primary);
}

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

.mobile-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

/* ---------- APP LAYOUT ---------- */
.app-layout {
  display: flex;
  padding-top: var(--topnav-height);
  min-height: 100vh;
}

/* ---------- SIDEBAR ---------- */
.sidebar {
  width: var(--sidebar-width);
  min-height: calc(100vh - var(--topnav-height));
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: fixed;
  top: var(--topnav-height);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 50;
}

.sidebar-inner {
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.sidebar-section {
  margin-bottom: 8px;
}

.sidebar-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  padding: 12px 12px 6px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
}

.sidebar-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-item.active,
.sidebar-item.current {
  background: var(--accent-bg);
  color: var(--accent-light);
}

.sidebar-item.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.badge-new {
  font-size: 0.6rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  padding: 1px 6px;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-soon {
  font-size: 0.6rem;
  font-weight: 600;
  background: var(--bg-hover);
  color: var(--text-muted);
  padding: 1px 6px;
  border-radius: 3px;
  text-transform: uppercase;
}

.sidebar-bottom {
  margin-top: auto;
  padding-top: 16px;
}

.sidebar-upgrade {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  transition: var(--transition);
  cursor: pointer;
}

.sidebar-upgrade:hover {
  background: rgba(108, 92, 231, 0.15);
}

/* ---------- MAIN CONTENT ---------- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: calc(100vh - var(--topnav-height));
  display: flex;
  flex-direction: column;
}

.main-content > .footer {
  margin-top: auto;
}

/* ---------- Tool Header ---------- */
.tool-header {
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tool-breadcrumb .active {
  color: var(--text-primary);
  font-weight: 600;
}

.tool-tabs {
  display: flex;
  gap: 4px;
}

.tool-tab {
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  color: var(--accent-light);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tool-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ---------- Generation Panel ---------- */
.gen-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  flex: 1;
}

.gen-panel-inner {
  padding: 28px 32px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.gen-field {
  margin-bottom: 20px;
}

.gen-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.required {
  color: var(--pink);
}

.field-hint {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* Model Selector */
.model-selector {
  display: flex;
  gap: 8px;
}

.model-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
}

.model-chip.active {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.model-icon {
  font-size: 1.1rem;
}

.model-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  margin-top: -12px;
}

/* Prompt */
.prompt-box {
  position: relative;
}

.prompt-box textarea {
  width: 100%;
  min-height: 100px;
  padding: 14px 16px;
  padding-bottom: 32px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.88rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color var(--transition);
}

.prompt-box textarea::placeholder {
  color: var(--text-muted);
}

.prompt-box textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.char-count {
  position: absolute;
  bottom: 10px;
  right: 14px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

.upload-zone:hover {
  border-color: var(--accent-border);
  background: var(--accent-bg);
}

.upload-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.upload-inner svg {
  color: var(--text-muted);
}

.upload-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.field-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* Settings Row */
.gen-settings {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.setting-item {
  display: flex;
  flex-direction: column;
}

.gen-select,
.gen-input {
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.82rem;
  transition: border-color var(--transition);
}

.gen-select:focus,
.gen-input:focus {
  outline: none;
  border-color: var(--accent);
}

.gen-select option {
  background: var(--bg-card);
}

/* Toggle */
.toggle-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.toggle-field .gen-label {
  margin-bottom: 0;
}

.toggle-switch {
  position: relative;
  width: 40px;
  height: 22px;
  cursor: pointer;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 11px;
  transition: var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  bottom: 3px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: var(--transition);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(18px);
}

/* Generate Button */
.gen-button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  margin-top: 24px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.gen-button:hover {
  background: var(--accent-light);
  box-shadow: 0 4px 24px rgba(108, 92, 231, 0.3);
}

.credit-badge {
  font-size: 0.7rem;
  font-weight: 500;
  opacity: 0.7;
}

/* Preview Area */
.gen-preview {
  display: flex;
  flex-direction: column;
  background: var(--bg-body);
}

.preview-header {
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.preview-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 60px 32px;
  text-align: center;
  color: var(--text-muted);
  min-height: 400px;
}

.preview-empty svg {
  opacity: 0.3;
}

.preview-empty p {
  font-size: 0.88rem;
  max-width: 260px;
}

/* ---------- SEO CONTENT ---------- */
.seo-content {
  border-top: 1px solid var(--border);
  padding: 0 32px;
}

.content-divider {
  text-align: center;
  padding: 40px 0 16px;
}

.content-divider span {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* SEO Hero */
.seo-hero {
  padding: 40px 0 48px;
  max-width: 820px;
  margin: 0 auto;
}

.seo-hero h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  text-align: center;
}

.seo-hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  text-align: center;
}

/* Capability Cards */
.seo-section {
  padding: 48px 0;
  max-width: 1000px;
  margin: 0 auto;
}

.seo-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 32px;
  text-align: center;
}

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

.cap-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
}

.cap-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.cap-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--accent-light);
  margin-bottom: 16px;
}

.cap-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.cap-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Overview Cards */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.overview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
}

.overview-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.overview-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.overview-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* FAQ */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--accent-border);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 0.92rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-q:hover {
  color: var(--accent-light);
}

.faq-arrow {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--accent);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-a {
  max-height: 300px;
  padding: 0 20px 16px;
}

.faq-a p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* CTA */
.seo-cta {
  text-align: center;
  padding: 64px 0;
  margin: 32px 0;
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.08), rgba(232, 67, 147, 0.05));
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-xl);
}

.seo-cta h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.seo-cta p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 28px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  padding: 14px 40px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  transition: var(--transition);
}

.cta-button:hover {
  background: var(--accent-light);
  box-shadow: 0 4px 24px rgba(108, 92, 231, 0.35);
  transform: translateY(-2px);
}

/* Platform Notice */
.platform-notice {
  padding: 28px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

.platform-notice h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.platform-notice p {
  font-size: 0.78rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ---------- FOOTER ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 32px 32px;
}

.footer-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.footer-columns {
  display: flex;
  gap: 64px;
  margin-bottom: 32px;
}

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

.footer-col h4 {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.footer-col a {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--accent-light);
}

.footer-langs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.footer-langs span {
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
}

.footer-langs span:hover {
  color: var(--accent-light);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal a {
  font-size: 0.72rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: var(--accent-light);
}

/* ---------- PREVIEW GALLERY ---------- */
.preview-gallery {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  max-height: calc(100vh - var(--topnav-height) - 100px);
}

.preview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.preview-card:hover {
  border-color: var(--accent-border);
}

.preview-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.preview-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(108, 92, 231, 0.85);
  border: 2px solid rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  z-index: 2;
  backdrop-filter: blur(4px);
}

.play-btn:hover {
  background: var(--accent);
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 0 24px rgba(108, 92, 231, 0.5);
}

.play-btn.playing {
  opacity: 0;
  pointer-events: none;
}

.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 3px 10px;
  background: rgba(108, 92, 231, 0.85);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  border-radius: 4px;
  letter-spacing: 1px;
  text-transform: uppercase;
  backdrop-filter: blur(4px);
  z-index: 2;
}

.preview-prompt {
  padding: 12px 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
  font-style: italic;
}

/* ---------- VIDEO SHOWCASE ---------- */
.video-showcase {
  padding: 48px 32px 40px;
  border-top: 1px solid var(--border);
  background: var(--bg-sidebar);
}

.showcase-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.showcase-title {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}

.showcase-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 28px;
}

.workflow-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
}

.wf-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.wf-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.wf-tab:hover:not(.active) {
  border-color: var(--accent-border);
  color: var(--text-primary);
}

/* Carousel */
.video-carousel {
  position: relative;
  margin-bottom: 28px;
}

.carousel-track {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 4px 0;
}

.carousel-track::-webkit-scrollbar {
  display: none;
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(13, 13, 18, 0.9);
  border: 1px solid var(--border);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 5;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.carousel-arrow:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.carousel-prev { left: -16px; }
.carousel-next { right: -16px; }

.showcase-card {
  min-width: 320px;
  max-width: 340px;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.showcase-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.showcase-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.showcase-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.showcase-prompt {
  padding: 16px;
}

.showcase-prompt p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-style: italic;
  margin-bottom: 12px;
}

.try-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 16px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  color: var(--accent-light);
  font-size: 0.78rem;
  font-weight: 600;
  transition: var(--transition);
}

.try-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.showcase-note {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---------- FEATURE VIDEOS ---------- */
.feature-videos {
  padding: 48px 32px;
  border-top: 1px solid var(--border);
}

.fv-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.fv-inner > h2 {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}

.fv-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

.fv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.fv-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.fv-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.fv-video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.fv-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.fv-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  padding: 16px 18px 6px;
}

.fv-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 0 18px 16px;
  line-height: 1.6;
}

/* Feature Highlight */
.fv-highlight {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.fv-highlight-video {
  position: relative;
  aspect-ratio: 16 / 10;
  background: #000;
  overflow: hidden;
}

.fv-video-lg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.play-btn-lg {
  width: 72px;
  height: 72px;
}

.fv-highlight-text {
  padding: 32px 32px 32px 0;
}

.fv-active-label {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 14px;
}

.fv-highlight-text h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.fv-highlight-text p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---------- STATS BAR ---------- */
.stats-bar {
  padding: 40px 32px;
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-inner {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-txt {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ---------- SIDEBAR OVERLAY ---------- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--topnav-height);
  background: rgba(0, 0, 0, 0.55);
  z-index: 80;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
  display: block;
  opacity: 1;
}

/* ---------- HAMBURGER ANIMATION ---------- */
.mobile-toggle span {
  transition: transform 0.3s ease, opacity 0.2s ease;
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* ---------- BODY SCROLL LOCK ---------- */
body.sidebar-open {
  overflow: hidden;
}

/* ---------- RESPONSIVE — TABLET (≤1024px) ---------- */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 90;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .mobile-toggle {
    display: flex;
  }

  .gen-panel {
    grid-template-columns: 1fr;
  }

  .gen-panel-inner {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .gen-preview {
    min-height: 300px;
  }

  .preview-gallery {
    max-height: none;
    flex-direction: row;
    overflow-x: auto;
    padding: 16px;
    -webkit-overflow-scrolling: touch;
  }

  .preview-card {
    min-width: 280px;
    flex-shrink: 0;
  }

  .cap-grid,
  .overview-grid {
    grid-template-columns: 1fr;
  }

  .gen-settings {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .fv-highlight {
    grid-template-columns: 1fr;
  }

  .fv-highlight-text {
    padding: 24px;
  }

  .stats-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }

  .footer-columns {
    flex-wrap: wrap;
    gap: 32px;
  }

  .showcase-title {
    font-size: 1.3rem;
  }

  .fv-inner > h2 {
    font-size: 1.3rem;
  }
}

/* ---------- RESPONSIVE — PHONE LANDSCAPE / SMALL TABLET (≤768px) ---------- */
@media (max-width: 768px) {
  .topnav-links {
    display: none;
  }

  .topnav-inner {
    padding: 0 16px;
    gap: 16px;
  }

  .tool-header {
    padding: 12px 16px;
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }

  .gen-panel-inner {
    padding: 20px 16px;
  }

  .model-selector {
    flex-wrap: wrap;
  }

  .seo-content {
    padding: 0 16px;
  }

  .seo-hero h1 {
    font-size: 1.5rem;
  }

  .seo-section h2 {
    font-size: 1.25rem;
  }

  .seo-cta {
    padding: 48px 20px;
  }

  .seo-cta h2 {
    font-size: 1.3rem;
  }

  .seo-cta p {
    font-size: 0.88rem;
  }

  .footer {
    padding: 32px 16px 24px;
  }

  .footer-columns {
    flex-direction: column;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
  }

  .video-showcase,
  .feature-videos {
    padding: 32px 16px;
  }

  .showcase-title {
    font-size: 1.15rem;
  }

  .showcase-card {
    min-width: 270px;
  }

  .workflow-tabs {
    flex-wrap: wrap;
    gap: 6px;
  }

  .wf-tab {
    padding: 7px 14px;
    font-size: 0.8rem;
  }

  .stats-bar {
    padding: 32px 16px;
  }

  .blog-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
  }

  .blog-list-header h1 {
    font-size: 1.5rem;
  }

  .cap-card,
  .overview-card {
    padding: 24px 20px;
  }

  .fv-inner > h2 {
    font-size: 1.15rem;
  }

  .fv-desc {
    font-size: 0.88rem;
  }

  .preview-empty {
    min-height: 300px;
    padding: 40px 24px;
  }

  .content-divider {
    padding: 32px 0 12px;
  }

  .seo-hero {
    padding: 28px 0 36px;
  }

  .seo-section {
    padding: 36px 0;
  }

  .platform-notice {
    padding: 20px 0;
  }
}

/* ---------- RESPONSIVE — PHONE PORTRAIT (≤480px) ---------- */
@media (max-width: 480px) {
  :root {
    --topnav-height: 50px;
  }

  .topnav-inner {
    padding: 0 12px;
  }

  .logo-label {
    font-size: 0.9rem;
  }

  .gen-panel-inner {
    padding: 16px 12px;
  }

  .gen-settings {
    grid-template-columns: 1fr;
  }

  .seo-hero h1 {
    font-size: 1.2rem;
  }

  .seo-hero-desc {
    font-size: 0.88rem;
  }

  .seo-content {
    padding: 0 12px;
  }

  .cap-card,
  .overview-card {
    padding: 20px 16px;
  }

  .cap-card h3,
  .overview-card h3 {
    font-size: 0.95rem;
  }

  .cap-card p,
  .overview-card p {
    font-size: 0.82rem;
  }

  .showcase-card {
    min-width: 240px;
    max-width: 100%;
  }

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

  .stat-num {
    font-size: 1.8rem;
  }

  .carousel-arrow {
    display: none;
  }

  .video-showcase,
  .feature-videos {
    padding: 24px 12px;
  }

  .footer {
    padding: 24px 12px 20px;
  }

  .footer-langs {
    gap: 8px;
    padding: 12px 0;
  }

  .footer-langs span {
    font-size: 0.68rem;
  }

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

  .seo-cta {
    padding: 36px 16px;
    margin: 24px 0;
    border-radius: var(--radius-lg);
  }

  .seo-cta h2 {
    font-size: 1.1rem;
  }

  .cta-button {
    padding: 12px 32px;
    font-size: 0.88rem;
  }

  .preview-empty {
    min-height: 240px;
    padding: 36px 16px;
  }

  .gen-button {
    padding: 12px 20px;
    font-size: 0.88rem;
    flex-wrap: wrap;
  }

  .faq-q {
    font-size: 0.85rem;
    padding: 14px 16px;
  }

  .faq-a p {
    font-size: 0.82rem;
  }

  .blog-card-body {
    padding: 16px;
  }

  .blog-card-link h2 {
    font-size: 0.95rem;
  }

  .blog-card-excerpt {
    font-size: 0.82rem;
  }

  .blog-article-inner {
    padding-bottom: 32px;
  }

  .blog-article h1 {
    font-size: 1.25rem;
  }

  .blog-article h2 {
    font-size: 1.05rem;
  }

  .blog-article p {
    font-size: 0.88rem;
  }

  .tool-tabs {
    width: 100%;
  }

  .tool-tab {
    flex: 1;
    text-align: center;
    padding: 6px 10px;
    font-size: 0.78rem;
  }

  .tool-breadcrumb {
    font-size: 0.8rem;
  }

  .sidebar {
    width: 260px;
  }

  .fv-highlight-text h3 {
    font-size: 1.05rem;
  }

  .fv-highlight-text p {
    font-size: 0.82rem;
  }

  .fv-card h3 {
    font-size: 0.88rem;
  }

  .fv-card p {
    font-size: 0.78rem;
  }
}

/* ---------- BLOG (matches main app layout) ---------- */
.breadcrumb-link {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: var(--transition);
}

.breadcrumb-link:hover {
  color: var(--text-primary);
}

.seo-content.blog-layout {
  flex: 1;
  padding-bottom: 48px;
}

.blog-list-header {
  margin-bottom: 40px;
  text-align: center;
  padding-top: 8px;
}

.blog-list-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 14px;
  line-height: 1.2;
}

.blog-list-lead {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.75;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto 8px;
  width: 100%;
}

.blog-card {
  margin: 0;
  min-width: 0;
}

.blog-card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.blog-card-link:hover {
  border-color: var(--accent-border);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(108, 92, 231, 0.12);
}

.blog-card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-input);
  overflow: hidden;
}

.blog-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.blog-card-link:hover .blog-card-cover img {
  transform: scale(1.06);
}

.blog-card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
  background: rgba(108, 92, 231, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

.blog-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 20px 22px 22px;
  gap: 0;
}

.blog-article-inner {
  max-width: 720px;
  margin: 0 auto;
  padding-bottom: 48px;
}

.blog-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 24px;
  transition: var(--transition);
}

.blog-back:hover {
  color: #fff;
}

.blog-card-meta {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.blog-card-link h2 {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 0 0 12px;
  line-height: 1.4;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-read {
  margin-top: auto;
  padding-top: 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-light);
  transition: color var(--transition);
}

.blog-card-link:hover .blog-card-read {
  color: #fff;
}

.blog-article h1 {
  font-size: clamp(1.5rem, 3.5vw, 1.85rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}

.blog-article .blog-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.blog-article .blog-lead {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
}

.blog-article h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 36px 0 14px;
}

.blog-article h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 28px 0 10px;
}

.blog-article p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.blog-article ul,
.blog-article ol {
  margin: 0 0 20px 1.2em;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.blog-article li {
  margin-bottom: 8px;
  list-style: disc;
}

.blog-article ol li {
  list-style: decimal;
}

.blog-article a {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.blog-article a:hover {
  color: #fff;
}

.blog-article blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 0 12px 20px;
  margin: 24px 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  font-style: italic;
  background: var(--accent-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.blog-sources {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.blog-article .blog-sources h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.blog-sources ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.blog-sources li {
  list-style: none;
  margin-bottom: 8px;
  font-size: 0.88rem;
}

.blog-sources a {
  word-break: break-all;
}