/* ═══════════════════════════════════════════
   SKATEVISION PRO — Sci-Fi Motion Capture UI
   ═══════════════════════════════════════════ */

:root {
  --bg-deep: #06060e;
  --bg-dark: #0a0a14;
  --bg-panel: #0d0d1a;
  --bg-card: #111128;
  --bg-card-hover: #16163a;
  --border: rgba(0, 240, 255, 0.12);
  --border-hover: rgba(0, 240, 255, 0.3);

  --cyan: #00f0ff;
  --cyan-dim: #00a8b3;
  --cyan-glow: rgba(0, 240, 255, 0.4);
  --purple: #a855f7;
  --purple-glow: rgba(168, 85, 247, 0.4);
  --green: #00ff88;
  --green-glow: rgba(0, 255, 136, 0.4);
  --orange: #ff8800;
  --red: #ff0044;
  --yellow: #ffd600;

  --text-primary: #e8eaf6;
  --text-secondary: #8b8fb0;
  --text-dim: #4a4e6a;

  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Noto Sans TC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan-dim) var(--bg-deep);
}

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

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--cyan-dim); border-radius: 3px; }

.hidden { display: none !important; }

.highlight { color: var(--cyan); }

/* ═══════════ COPY PROTECTION (deterrent) ═══════════ */
html.no-copy,
html.no-copy body {
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

html.no-copy img {
  -webkit-user-drag: none;
  user-select: none;
}

html.no-copy button,
html.no-copy input,
html.no-copy select,
html.no-copy textarea,
html.no-copy video,
html.no-copy .allow-copy,
html.no-copy .allow-copy * {
  -webkit-user-select: auto;
  -moz-user-select: auto;
  user-select: auto;
}

/* ═══════════ LOADING SCREEN ═══════════ */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loading-screen.fade-out {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
}

.loader-ring {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--cyan);
  animation: spin 1s linear infinite;
  box-shadow: 0 0 30px var(--cyan-glow);
}

.loader-title {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--cyan);
  letter-spacing: 4px;
  margin-bottom: 8px;
}

.loader-status {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 2px;
  animation: blink 1s step-end infinite;
}

.loader-steps {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}

.load-step {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 1px;
  transition: color 0.3s ease;
}

.load-step .step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.load-step.active {
  color: var(--cyan);
}

.load-step.active .step-dot {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
  animation: pulse-dot 1s ease infinite;
}

.load-step.done {
  color: var(--green);
}

.load-step.done .step-dot {
  background: var(--green);
  box-shadow: 0 0 6px var(--green-glow);
  animation: none;
}

.load-step.error {
  color: var(--red);
}

.load-step.error .step-dot {
  background: var(--red);
  box-shadow: 0 0 6px rgba(255, 0, 68, 0.4);
  animation: none;
}

/* Engine Error Banner */
.engine-error-banner {
  position: fixed;
  top: 72px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 900;
  background: rgba(255, 0, 68, 0.1);
  border: 1px solid rgba(255, 0, 68, 0.3);
  border-radius: var(--radius);
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--red);
  text-align: center;
  max-width: 600px;
  backdrop-filter: blur(10px);
  letter-spacing: 0.5px;
  line-height: 1.6;
}

.engine-error-banner a {
  color: var(--cyan);
  text-decoration: underline;
}

/* ═══════════ NAVIGATION ═══════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(6, 6, 14, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

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

.logo-icon svg {
  width: 36px;
  height: 36px;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 3px;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: var(--transition);
  letter-spacing: 0.5px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan);
  border-color: var(--border-hover);
  background: rgba(0, 240, 255, 0.05);
}

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

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green-glow);
  animation: pulse-dot 2s ease infinite;
}

.status-dot.loading {
  background: var(--orange);
  box-shadow: 0 0 8px rgba(255, 136, 0, 0.4);
}

.status-dot.error {
  background: var(--red);
  box-shadow: 0 0 8px rgba(255, 0, 68, 0.4);
  animation: none;
}

.status-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* ═══════════ HERO SECTION ═══════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 80px 32px;
}

.particle-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 4px;
  color: var(--cyan);
  padding: 6px 20px;
  border: 1px solid var(--border-hover);
  border-radius: 20px;
  margin-bottom: 32px;
  background: rgba(0, 240, 255, 0.05);
  animation: fadeInUp 0.8s ease both;
}

.hero-title {
  font-family: var(--font-display);
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-title .line1 {
  display: block;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 8px;
  margin-bottom: 8px;
}

.hero-title .line2 {
  display: block;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: 4px;
  line-height: 1.2;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 56px;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  animation: fadeInUp 0.8s ease 0.8s both;
}

.stat {
  text-align: center;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* Hero Visual Effects */
.hero-visual {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.holo-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  opacity: 0.15;
}

.ring1 {
  width: 500px;
  height: 500px;
  border-color: var(--cyan);
  animation: rotateSlow 20s linear infinite;
}

.ring2 {
  width: 650px;
  height: 650px;
  border-color: var(--purple);
  animation: rotateSlow 30s linear infinite reverse;
  border-style: dashed;
}

.ring3 {
  width: 800px;
  height: 800px;
  border-color: var(--cyan);
  animation: rotateSlow 40s linear infinite;
  border-style: dotted;
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  z-index: 2;
}

.scroll-indicator span {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 2px;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  margin: 8px auto 0;
  border-right: 2px solid var(--cyan-dim);
  border-bottom: 2px solid var(--cyan-dim);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease infinite;
}

/* ═══════════ BUTTONS ═══════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 240, 255, 0.05));
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-primary:hover {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.25), rgba(0, 240, 255, 0.1));
  box-shadow: 0 0 30px var(--cyan-glow);
  transform: translateY(-2px);
}

.btn-glow {
  box-shadow: 0 0 20px var(--cyan-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

.btn-purple {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(168, 85, 247, 0.05));
  border-color: var(--purple);
  color: var(--purple);
}

.btn-purple:hover {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.25), rgba(168, 85, 247, 0.1));
  box-shadow: 0 0 30px var(--purple-glow);
  transform: translateY(-2px);
}

/* ═══════════ SECTION COMMONS ═══════════ */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 4px;
  color: var(--cyan);
  padding: 4px 16px;
  border: 1px solid var(--border-hover);
  border-radius: 16px;
  margin-bottom: 16px;
  background: rgba(0, 240, 255, 0.04);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 2px;
}

.section-desc {
  color: var(--text-secondary);
  margin-top: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ═══════════ ANALYSIS SECTION ═══════════ */
.analysis-section {
  padding: 100px 32px 60px;
  min-height: 100vh;
}

/* Source Selection Cards */
.source-selection {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.source-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.source-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

.source-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
}

.source-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.source-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.upload-hint {
  font-size: 0.78rem !important;
  color: var(--text-dim) !important;
  margin-bottom: 16px !important;
  line-height: 1.55;
}

.upload-hint code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan-dim);
  background: rgba(0, 240, 255, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
}

.upload-overlay {
  position: fixed;
  inset: 0;
  z-index: 9500;
  background: rgba(6, 6, 14, 0.88);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-overlay.hidden {
  display: none !important;
}

.upload-overlay-box {
  text-align: center;
  padding: 36px 48px;
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.08);
}

.upload-ring {
  width: 48px;
  height: 48px;
  margin: 0 auto 18px;
}

#upload-overlay-text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 1px;
  margin: 0;
}

/* ═══════════ CONTROLS BAR ═══════════ */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.controls-left,
.controls-center,
.controls-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ctrl-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
}

.ctrl-btn svg {
  width: 16px;
  height: 16px;
}

.ctrl-btn:hover {
  background: rgba(0, 240, 255, 0.08);
  border-color: var(--cyan-dim);
  color: var(--cyan);
}

.ctrl-btn.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--cyan);
  color: var(--cyan);
}

.ctrl-select {
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
}

.source-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  letter-spacing: 1px;
}

.indicator-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green-glow);
  animation: pulse-dot 1.5s ease infinite;
}

/* ═══════════ ANALYSIS LAYOUT ═══════════ */
.analysis-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 16px;
  align-items: start;
}

@media (max-width: 1200px) {
  .analysis-layout {
    grid-template-columns: 1fr;
  }
}

/* Video Panel */
.video-panel {
  position: relative;
}

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.video-container canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Scan Line Effect */
.scan-line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0.4;
  z-index: 5;
  animation: scanDown 3s linear infinite;
  pointer-events: none;
}

/* Corner Marks */
.corner-marks {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 4;
}

.corner {
  position: absolute;
  width: 24px;
  height: 24px;
  border-color: var(--cyan);
  border-style: solid;
  opacity: 0.6;
}

.corner.tl { top: 8px; left: 8px; border-width: 2px 0 0 2px; }
.corner.tr { top: 8px; right: 8px; border-width: 2px 2px 0 0; }
.corner.bl { bottom: 8px; left: 8px; border-width: 0 0 2px 2px; }
.corner.br { bottom: 8px; right: 8px; border-width: 0 2px 2px 0; }

/* Video HUD Overlays */
.video-hud-top,
.video-hud-bottom {
  position: absolute;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan);
  letter-spacing: 1px;
  z-index: 5;
  pointer-events: none;
}

.video-hud-top { top: 0; }
.video-hud-bottom { bottom: 0; }

/* No Signal Overlay */
.no-signal {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(6, 6, 14, 0.9);
  z-index: 3;
}

.no-signal-icon svg {
  width: 64px;
  height: 64px;
  animation: rotateSlow 10s linear infinite;
}

.no-signal span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  letter-spacing: 2px;
}

/* Timeline */
.timeline {
  margin-top: 12px;
  padding: 8px 0;
}

.timeline-track {
  position: relative;
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid var(--border);
}

.timeline-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s linear;
}

.timeline-thumb {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--cyan-glow);
  cursor: grab;
  transition: left 0.1s linear;
}

/* ═══════════ DASHBOARD PANEL ═══════════ */
.dashboard-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  padding-right: 4px;
}

.dash-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.dash-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 1px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.card-icon {
  font-size: 1rem;
}

/* Trick Selector */
.trick-select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.trick-select:focus {
  border-color: var(--cyan);
  outline: none;
  box-shadow: 0 0 12px var(--cyan-glow);
}

/* Angle Gauges */
.angles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

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

.angle-gauge {
  position: relative;
  width: 72px;
  height: 72px;
  margin: 0 auto 6px;
}

.angle-gauge svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.gauge-bg {
  fill: none;
  stroke: var(--bg-dark);
  stroke-width: 5;
}

.gauge-fill {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 213.6;
  stroke-dashoffset: 213.6;
  transition: stroke-dashoffset 0.3s ease, stroke 0.3s ease;
  filter: drop-shadow(0 0 4px var(--cyan-glow));
}

.gauge-value {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--cyan);
}

.angle-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

/* Metrics */
.metrics-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.metric-row {
  display: grid;
  grid-template-columns: 90px 1fr 50px;
  align-items: center;
  gap: 10px;
}

.metric-name {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.metric-bar-wrap {
  position: relative;
}

.metric-bar {
  height: 6px;
  background: var(--bg-dark);
  border-radius: 3px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  transition: width 0.3s ease;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  text-align: right;
}

/* Feedback */
.feedback-content {
  min-height: 80px;
}

.feedback-placeholder {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 20px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.feedback-item {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}

.feedback-item:last-child { border-bottom: none; }

.feedback-icon {
  flex-shrink: 0;
  font-size: 1rem;
}

.feedback-text {
  color: var(--text-secondary);
  line-height: 1.5;
}

.feedback-text strong {
  color: var(--text-primary);
}

/* Score Display */
.score-display {
  text-align: center;
}

.score-ring {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 8px;
}

.score-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.score-ring-bg {
  fill: none;
  stroke: var(--bg-dark);
  stroke-width: 6;
}

.score-ring-fill {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: 326.7;
  stroke-dashoffset: 326.7;
  transition: stroke-dashoffset 0.5s ease, stroke 0.5s ease;
  filter: drop-shadow(0 0 6px var(--cyan-glow));
}

.score-number {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--cyan);
}

.score-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* ═══════════ SHOWCASE SECTION ═══════════ */
.showcase-section {
  padding: 80px 32px;
  background: var(--bg-dark);
  overflow: hidden;
}

/* Hero Image */
.showcase-hero-img {
  max-width: 1000px;
  margin: 0 auto 64px;
}

/* Image Frame with sci-fi border */
.img-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-deep);
}

.img-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  transition: transform 0.5s ease;
}

.img-frame:hover img {
  transform: scale(1.02);
}

.img-frame-border {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-hover);
  pointer-events: none;
  box-shadow:
    inset 0 0 30px rgba(0, 240, 255, 0.05),
    0 0 40px rgba(0, 240, 255, 0.08);
  transition: var(--transition);
}

.img-frame:hover .img-frame-border {
  border-color: var(--cyan);
  box-shadow:
    inset 0 0 40px rgba(0, 240, 255, 0.1),
    0 0 60px rgba(0, 240, 255, 0.15);
}

.img-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 20px;
  background: linear-gradient(transparent, rgba(6, 6, 14, 0.9));
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: var(--cyan-dim);
  text-align: center;
}

/* Showcase Grid: Two Column Cards */
.showcase-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 48px;
  margin-bottom: 64px;
}

.showcase-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.showcase-card.reverse {
  direction: rtl;
}

.showcase-card.reverse > * {
  direction: ltr;
}

.showcase-card-text h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 1px;
  margin-bottom: 14px;
  line-height: 1.4;
}

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

.showcase-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 5px 12px;
  border-radius: 20px;
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid rgba(0, 240, 255, 0.2);
  color: var(--cyan);
  letter-spacing: 0.5px;
}

.stag-purple {
  background: rgba(168, 85, 247, 0.06);
  border-color: rgba(168, 85, 247, 0.2);
  color: var(--purple);
}

/* Detail Section */
.showcase-detail {
  max-width: 1100px;
  margin: 0 auto 64px;
}

.showcase-detail-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

.showcase-detail-text h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 1px;
  margin-bottom: 14px;
  line-height: 1.4;
}

.showcase-detail-text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.detail-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.detail-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.df-icon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.df-icon.cyan-glow {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
}

.df-icon.green-glow {
  background: var(--green);
  box-shadow: 0 0 8px var(--green-glow);
}

.df-icon.purple-glow {
  background: var(--purple);
  box-shadow: 0 0 8px var(--purple-glow);
}

/* Tricks Overview Wide Image */
.showcase-tricks-visual {
  max-width: 1000px;
  margin: 0 auto;
}

.img-frame.wide {
  aspect-ratio: 16 / 9;
}

.img-frame.wide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Scroll Reveal Animation */
.showcase-hero-img,
.showcase-card,
.showcase-detail-content,
.showcase-tricks-visual {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.showcase-hero-img.visible,
.showcase-card.visible,
.showcase-detail-content.visible,
.showcase-tricks-visual.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .showcase-section {
    padding: 60px 16px;
  }

  .showcase-card {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .showcase-card.reverse {
    direction: ltr;
  }

  .showcase-detail-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .showcase-card-text h3,
  .showcase-detail-text h3 {
    font-size: 1.1rem;
  }
}

/* ═══════════ TRICKS LIBRARY ═══════════ */
.tricks-section {
  padding: 80px 32px;
  background: var(--bg-dark);
}

.tricks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.trick-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
  cursor: pointer;
}

.trick-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
}

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

.trick-name {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 1px;
}

.trick-difficulty {
  display: flex;
  gap: 3px;
}

.trick-difficulty .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.trick-difficulty .dot.filled {
  background: var(--cyan);
  box-shadow: 0 0 4px var(--cyan-glow);
}

.trick-name-zh {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.trick-angles {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.trick-angle-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 8px;
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--cyan-dim);
}

.trick-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 10px;
  line-height: 1.5;
}

/* ═══════════ ABOUT / FEATURES ═══════════ */
.about-section {
  padding: 80px 32px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: var(--transition);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.footer-tech {
  display: flex;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* ═══════════ ANIMATIONS ═══════════ */
@keyframes spin {
  to { transform: rotate(360deg); }
}

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

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rotateSlow {
  to { transform: rotate(360deg); }
}

@keyframes scanDown {
  0% { top: 0%; opacity: 0; }
  10% { opacity: 0.4; }
  90% { opacity: 0.4; }
  100% { top: 100%; opacity: 0; }
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(8px); }
}

/* ═══════════ RESPONSIVE ═══════════ */
@media (max-width: 768px) {
  .nav {
    padding: 0 16px;
  }

  .nav-links {
    display: none;
  }

  .nav-status {
    display: none;
  }

  .hero {
    padding: 80px 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }

  .stat-divider {
    display: none;
  }

  .analysis-section {
    padding: 80px 16px 40px;
  }

  .source-selection {
    grid-template-columns: 1fr;
  }

  .analysis-layout {
    grid-template-columns: 1fr;
  }

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

  .controls-bar {
    justify-content: center;
  }

  .tricks-section,
  .about-section {
    padding: 60px 16px;
  }

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

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

  .footer-tech {
    flex-direction: column;
    align-items: center;
  }
}