/* ═══════════════════════════════════════════════════
   SignAI — Sci-Fi Design Upgrade
   ═══════════════════════════════════════════════════ */

/* ─── SCI-FI BODY OVERLAY ───────────────────────── */
/* Subtle CRT scanline texture over whole page */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 229, 255, 0.012) 2px,
    rgba(0, 229, 255, 0.012) 4px
  );
}

/* Hex grid overlay on background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(0,229,255,0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(124,58,237,0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(59,130,246,0.02) 0%, transparent 70%);
}

/* ─── KESTFORD NAV BUTTON ───────────────────────── */
.nav-kestford-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid rgba(0,229,255,0.25);
  background: linear-gradient(135deg, rgba(0,229,255,0.06), rgba(124,58,237,0.08));
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: all 0.25s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.nav-kestford-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,229,255,0.0), rgba(0,229,255,0.12));
  opacity: 0;
  transition: opacity 0.25s;
}

.nav-kestford-btn:hover::before { opacity: 1; }

.nav-kestford-btn:hover {
  border-color: rgba(0,229,255,0.55);
  color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0,229,255,0.18), inset 0 0 12px rgba(0,229,255,0.06);
  transform: translateY(-1px);
}

.nav-kestford-icon {
  font-size: 14px;
  color: var(--accent-cyan);
  line-height: 1;
  animation: hexSpin 8s linear infinite;
}

@keyframes hexSpin {
  0%   { transform: rotate(0deg);   }
  100% { transform: rotate(360deg); }
}

.nav-kestford-label { position: relative; z-index: 1; }

.nav-kestford-arrow {
  font-size: 13px;
  transition: transform 0.2s;
  color: var(--accent-cyan);
}

.nav-kestford-btn:hover .nav-kestford-arrow {
  transform: translate(2px, -2px);
}

/* ─── NAV STATUS REFINEMENT ─────────────────────── */
.nav-status {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 100px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ─── UPGRADED GLASS CARDS ──────────────────────── */
.glass-card {
  position: relative;
}

/* Sci-fi border shimmer on cards */
.glass-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid transparent;
  background: linear-gradient(135deg, rgba(0,229,255,0.06), transparent 40%, rgba(124,58,237,0.06)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out;
  mask-composite: exclude;
  pointer-events: none;
}

/* ─── SCI-FI HERO TITLE ─────────────────────────── */
.hero-title-line1,
.hero-title-line2 {
  position: relative;
}

/* Glitch flicker on hover */
.hero-title:hover .hero-title-line2 {
  animation: glitch 0.3s var(--ease-cinematic);
}

@keyframes glitch {
  0%   { transform: translate(0, 0) skewX(0deg); }
  20%  { transform: translate(-3px, 0) skewX(-1deg); filter: hue-rotate(30deg); }
  40%  { transform: translate(3px, 0) skewX(1deg); }
  60%  { transform: translate(-2px, 0) skewX(0deg); }
  80%  { transform: translate(2px, 0); filter: hue-rotate(0deg); }
  100% { transform: translate(0, 0); }
}

/* ─── SCI-FI CAMERA VIEWPORT ────────────────────── */
.camera-viewport {
  background: #020408;
}

/* Animated cyan border on active camera */
.camera-viewport.active {
  border-color: transparent;
  background: linear-gradient(#020408, #020408) padding-box,
    linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-blue), var(--accent-cyan)) border-box;
  border: 1.5px solid transparent;
  animation: borderRotate 4s linear infinite;
}

@keyframes borderRotate {
  0%   { background: linear-gradient(#020408, #020408) padding-box, linear-gradient(0deg,   var(--accent-cyan), var(--accent-purple)) border-box; }
  25%  { background: linear-gradient(#020408, #020408) padding-box, linear-gradient(90deg,  var(--accent-cyan), var(--accent-purple)) border-box; }
  50%  { background: linear-gradient(#020408, #020408) padding-box, linear-gradient(180deg, var(--accent-cyan), var(--accent-purple)) border-box; }
  75%  { background: linear-gradient(#020408, #020408) padding-box, linear-gradient(270deg, var(--accent-cyan), var(--accent-purple)) border-box; }
  100% { background: linear-gradient(#020408, #020408) padding-box, linear-gradient(360deg, var(--accent-cyan), var(--accent-purple)) border-box; }
}

/* Grid overlay on inactive camera */
.camera-placeholder {
  background:
    linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px),
    radial-gradient(ellipse at center, rgba(59,130,246,0.06) 0%, transparent 70%);
  background-size: 40px 40px, 40px 40px, cover;
}

/* ─── DETECTION DISPLAY UPGRADE ─────────────────── */
.detection-sign {
  font-family: var(--font-display);
  text-shadow: 0 0 30px rgba(0,229,255,0.4), 0 0 60px rgba(0,229,255,0.15);
}

/* ─── CONFIDENCE BAR GLOW ───────────────────────── */
.confidence-fill.high {
  box-shadow: 0 0 10px rgba(0,229,255,0.5);
}
.confidence-fill.medium {
  box-shadow: 0 0 10px rgba(245,158,11,0.4);
}

/* ─── HISTORY ITEMS HOVER ───────────────────────── */
.history-item:hover {
  background: linear-gradient(135deg, rgba(0,229,255,0.04), rgba(124,58,237,0.04));
  border-color: rgba(0,229,255,0.15) !important;
}

/* ─── BUTTON ENHANCEMENTS ───────────────────────── */
.btn-primary {
  text-shadow: 0 0 10px rgba(0,0,0,0.5);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s;
}

.btn-primary:hover::before { left: 100%; }

/* ─── PRACTICE MODE UPGRADE ─────────────────────── */
.practice-sign-display {
  text-shadow: 0 0 40px rgba(0,229,255,0.3), 0 0 80px rgba(124,58,237,0.2);
}

/* ─── SIGN CELL HOVER GLOW ──────────────────────── */
.sign-cell:hover {
  box-shadow: 0 0 16px rgba(0,229,255,0.15);
}

.sign-cell-char {
  text-shadow: 0 0 12px rgba(0,229,255,0.3);
}

/* ─── EXPRESSION RING UPGRADE ───────────────────── */
.expression-ring {
  filter: drop-shadow(0 0 16px rgba(0,229,255,0.2));
}

.expression-emoji {
  filter: drop-shadow(0 0 16px rgba(0,0,0,0.6));
}

/* ─── UPGRADED HERO BADGE ───────────────────────── */
.hero-badge {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 0 20px rgba(0,229,255,0.08);
}

/* ─── TRANSLATION TEXT GLOW ─────────────────────── */
.translation-text:not(.empty) {
  text-shadow: 0 0 20px rgba(255,255,255,0.04);
}

/* ─── SECTION LABELS UPGRADE ────────────────────── */
.section-label {
  color: var(--accent-cyan);
  opacity: 0.7;
}

/* ─── FOOTER UPGRADE ─────────────────────────────── */
.footer {
  background: linear-gradient(to top, rgba(0,229,255,0.025), transparent);
  border-top: 1px solid rgba(0,229,255,0.08);
}

/* ─── SPLASH UPGRADE ─────────────────────────────── */
.splash-logo-ring {
  box-shadow: 0 0 0 8px rgba(0,229,255,0.04), 0 0 40px rgba(0,229,255,0.1);
}

/* ─── TOAST UPGRADE ──────────────────────────────── */
.toast {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* ─── CORNER BRACKET GLOW ───────────────────────── */
.corner {
  filter: drop-shadow(0 0 4px var(--accent-cyan));
}

/* ─── NAV BRAND GLOW ─────────────────────────────── */
.nav-brand-icon {
  box-shadow: 0 0 16px rgba(0,229,255,0.3);
}

/* ─── REC INDICATOR UPGRADE ─────────────────────── */
.rec-indicator {
  font-family: var(--font-mono);
  letter-spacing: 0.15em;
}

/* ─── UPLOAD ZONE UPGRADE ────────────────────────── */
.upload-zone:hover {
  box-shadow: 0 0 24px rgba(0,229,255,0.08);
}

/* ─── FACE META BADGES UPGRADE ──────────────────── */
.face-meta-badge.visible {
  box-shadow: 0 0 12px rgba(0,229,255,0.08);
}

/* ─── SCROLLBAR UPGRADE ──────────────────────────── */
::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-purple));
}

/* ─── MOBILE NAV KESTFORD BUTTON ────────────────── */
@media (max-width: 768px) {
  .nav-kestford-label { display: none; }
  .nav-kestford-btn   { padding: 8px 10px; }
  .nav-status-text    { display: none; }
}

@media (max-width: 480px) {
  .nav-kestford-btn { gap: 4px; }
}

/* ═══════════════════════════════════════════════════
   Responsive compatibility patch
   Keeps the existing visual design while making the UI usable on
   small portrait screens, short landscape screens, and desktop.
   ═══════════════════════════════════════════════════ */
:root {
  --font-emoji: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Android Emoji", "EmojiSymbols", sans-serif;
}

html,
body,
#root {
  width: 100%;
  max-width: 100%;
}

body {
  min-width: 0;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.nav-brand-icon,
.nav-kestford-icon,
.nav-kestford-arrow,
.card-title-icon,
.camera-placeholder-icon,
.btn-icon,
.upload-icon,
.privacy-icon,
.expression-emoji,
.expr-emoji-sm,
.no-face-icon,
.splash-logo-inner,
.toast span:first-child,
.history-sign,
.sign-cell-char {
  font-family: var(--font-emoji);
  line-height: 1;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.btn,
.nav-link,
.practice-cat,
.select,
.translation-text,
.privacy-text,
.card-title,
.nav-status {
  min-width: 0;
}

img,
video,
canvas,
svg {
  max-width: 100%;
}

.camera-feed,
.camera-overlay-canvas,
.face-canvas-layer {
  object-fit: cover;
}

@media (hover: none) and (pointer: coarse) {
  .btn,
  .nav-link,
  .practice-cat,
  .select,
  .upload-zone,
  .sign-cell {
    min-height: 44px;
  }
}

@media (max-width: 900px) {
  .nav {
    flex-wrap: wrap;
    gap: 10px 12px;
    padding: calc(12px + env(safe-area-inset-top)) 16px 12px;
  }

  .nav-brand {
    flex: 0 0 auto;
  }

  .nav-actions {
    margin-left: auto;
    gap: 8px;
  }

  .nav-links {
    order: 3;
    display: flex;
    flex: 0 0 100%;
    width: 100%;
    gap: 6px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 2px 2px 4px;
    margin: 0 -2px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    flex: 0 0 auto;
    padding: 8px 12px;
    font-size: 12px;
    white-space: nowrap;
  }

  .main-app {
    padding-top: 124px;
  }

  .container {
    width: 100%;
    max-width: 100%;
  }

  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    width: 100%;
    min-width: 0;
  }

  .hero {
    padding: 32px 0 22px;
  }

  .hero-title {
    font-size: clamp(42px, 13vw, 76px);
  }

  .hero-subtitle {
    max-width: 92vw;
  }

  .glass-card,
  .camera-viewport,
  .privacy-notice {
    border-radius: clamp(14px, 4vw, var(--radius-xl));
  }
}

@media (max-width: 480px) {
  .nav {
    padding-left: 12px;
    padding-right: 12px;
  }

  .nav-brand-icon {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .nav-brand-name {
    font-size: 21px;
    letter-spacing: 0.08em;
  }

  .nav-kestford-btn {
    min-width: 40px;
    height: 38px;
    padding: 8px 10px;
  }

  .nav-kestford-arrow {
    display: none;
  }

  .nav-status {
    height: 38px;
    padding: 6px 10px;
  }

  .main-app {
    padding-top: 118px;
  }

  .container {
    padding: 0 12px;
  }

  .hero-badge {
    max-width: 100%;
    gap: 6px;
    padding: 6px 12px;
    font-size: 10px;
    letter-spacing: 0.12em;
    white-space: normal;
    justify-content: center;
  }

  .hero-title {
    font-size: clamp(38px, 15vw, 58px);
    line-height: 0.95;
  }

  .hero-subtitle {
    font-size: 14px;
    line-height: 1.55;
  }

  .workspace {
    gap: 16px;
    padding-bottom: 28px;
  }

  .card-header {
    padding: 16px;
    gap: 10px;
  }

  .card-title {
    gap: 8px;
    font-size: 11px;
    letter-spacing: 0.09em;
    overflow-wrap: anywhere;
  }

  .camera-section {
    gap: 12px;
  }

  .camera-viewport {
    aspect-ratio: 3 / 4;
    min-height: 280px;
    max-height: min(70vh, 520px);
  }

  .camera-placeholder {
    gap: 10px;
    padding: 16px;
  }

  .camera-placeholder-icon {
    font-size: 48px;
  }

  .camera-placeholder-text,
  .gesture-hint,
  .rec-indicator {
    font-size: 11px;
  }

  .gesture-hint {
    left: 12px;
    right: 12px;
    transform: none;
    white-space: normal;
    text-align: center;
  }

  .camera-controls {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .camera-controls .select-wrapper {
    width: auto !important;
    flex: auto !important;
  }

  .camera-controls .btn,
  .camera-controls .select {
    width: 100%;
  }

  .camera-controls .btn-icon {
    width: 100%;
    height: auto;
    min-height: 44px;
  }

  .btn {
    padding: 11px 12px;
    font-size: 12px;
  }

  .btn-icon {
    min-width: 42px;
  }

  .translation-output,
  .detection-display,
  .confidence-wrapper,
  .tts-panel,
  .practice-target,
  .practice-feedback,
  .practice-score {
    padding-left: 16px;
    padding-right: 16px;
  }

  .translation-actions,
  .practice-nav {
    flex-wrap: wrap;
  }

  .translation-text {
    font-size: 17px;
  }

  .detection-sign {
    min-height: 76px;
    font-size: clamp(54px, 22vw, 74px);
  }

  .expression-ring {
    width: 104px;
    height: 104px;
  }

  .expression-emoji {
    font-size: 46px;
  }

  .expr-row {
    grid-template-columns: 24px 72px minmax(0, 1fr) 34px;
    gap: 6px;
  }

  .sign-grid {
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 7px;
    padding: 12px;
  }

  .upload-zone {
    margin: 16px;
    padding: 30px 18px;
  }

  .privacy-notice {
    padding: 14px 16px;
  }

  .toast {
    left: 12px;
    right: 12px;
    bottom: calc(18px + env(safe-area-inset-bottom));
    transform: translateY(80px);
    justify-content: center;
    white-space: normal;
    text-align: center;
  }

  .toast.visible {
    transform: translateY(0);
  }
}

@media (max-width: 360px) {
  .nav {
    gap: 8px;
    padding-left: 10px;
    padding-right: 10px;
  }

  .nav-brand-name {
    font-size: 18px;
  }

  .nav-brand-icon {
    width: 30px;
    height: 30px;
  }

  .nav-actions {
    gap: 6px;
  }

  .nav-status {
    padding: 6px 8px;
  }

  .container {
    padding: 0 10px;
  }

  .hero {
    padding-top: 24px;
  }

  .camera-viewport {
    min-height: 250px;
  }

  .camera-controls {
    grid-template-columns: minmax(0, 1fr);
  }

  .tabs,
  .practice-cats,
  .sign-grid {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .expr-row {
    grid-template-columns: 22px 66px minmax(0, 1fr) 32px;
  }
}

@media (max-width: 220px), (max-height: 220px) {
  .splash-title,
  .splash-tagline,
  .hero,
  .nav-brand-name,
  .nav-kestford-label,
  .nav-kestford-arrow,
  .nav-status,
  .privacy-notice,
  .footer {
    display: none !important;
  }

  .nav {
    position: sticky;
    padding: 6px;
    gap: 6px;
  }

  .nav-links {
    display: flex;
    order: 2;
    flex: 1 1 100%;
    gap: 4px;
    overflow-x: auto;
  }

  .nav-link,
  .btn,
  .select,
  .practice-cat {
    min-height: 30px;
    padding: 6px 8px;
    font-size: 10px;
  }

  .main-app {
    padding-top: 0;
  }

  .container {
    padding: 4px;
  }

  .workspace,
  .camera-section,
  .translation-stack,
  .sidebar {
    gap: 6px;
  }

  .glass-card,
  .camera-viewport {
    border-radius: 10px;
  }

  .card-header {
    padding: 8px;
  }

  .card-title {
    font-size: 9px;
  }

  .camera-viewport {
    min-height: 90px;
    aspect-ratio: 4 / 3;
  }

  .camera-placeholder-icon,
  .no-face-icon,
  .upload-icon {
    font-size: 24px;
  }

  .camera-placeholder-text,
  .gesture-hint,
  .rec-indicator {
    display: none;
  }
}

@media (orientation: landscape) and (max-height: 520px) {
  .nav {
    padding-top: calc(8px + env(safe-area-inset-top));
    padding-bottom: 8px;
  }

  .main-app {
    padding-top: 76px;
  }

  .nav-links {
    order: 0;
    flex: 1 1 auto;
    width: auto;
    overflow-x: auto;
    margin: 0;
    padding: 0;
  }

  .nav-link {
    padding: 7px 10px;
    font-size: 11px;
  }

  .hero {
    padding: 16px 0 14px;
  }

  .hero-title {
    font-size: clamp(34px, 7vw, 56px);
    margin-bottom: 10px;
  }

  .hero-subtitle {
    display: none;
  }

  .hero-badge {
    margin-bottom: 12px;
  }

  .workspace {
    gap: 14px;
  }

  .camera-viewport {
    aspect-ratio: 16 / 9;
    min-height: 180px;
    max-height: calc(100vh - 170px);
  }

  .card-header {
    padding: 12px 16px;
  }

  .detection-display {
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .footer {
    padding: 18px 24px;
  }
}

@media (orientation: landscape) and (max-height: 520px) and (min-width: 600px) {
  .workspace {
    grid-template-columns: minmax(300px, 1fr) minmax(250px, 320px);
  }
}

@media (min-width: 901px) {
  .nav-links {
    min-width: 0;
  }

  .nav-link {
    white-space: nowrap;
  }
}