:root {
  color-scheme: light;
  --bg: #f6fbf8;
  --surface: #ffffff;
  --surface-strong: #edf8f5;
  --text: #142421;
  --muted: #50645f;
  --border: #cde5df;
  --accent: #087f7a;
  --accent-strong: #066b67;
  --coral: #e95d4f;
  --gold: #e3b341;
  --success: #1f8a53;
  --error: #b7332b;
  --shadow: 0 18px 45px rgba(11, 47, 42, 0.15);
  --radius: 8px;
  --max-width: 1180px;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1513;
  --surface: #15231f;
  --surface-strong: #1b302b;
  --text: #eef8f5;
  --muted: #b8cbc5;
  --border: #385b53;
  --accent: #4ed3c7;
  --accent-strong: #76e2d7;
  --coral: #ff8a7f;
  --gold: #f4cc64;
  --success: #6bd69a;
  --error: #ff8d83;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

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

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-150%);
  background: var(--surface);
  color: var(--text);
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 3rem);
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
}

.brand,
.nav-links {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.65rem;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: inline-grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border-radius: var(--radius);
  background: var(--accent);
  color: #ffffff;
}

.nav-links {
  gap: clamp(0.6rem, 2vw, 1.4rem);
  color: var(--muted);
  font-weight: 700;
}

.nav-links a {
  text-decoration: none;
}

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

.theme-toggle {
  min-height: 2.75rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
}

.hero {
  position: relative;
  min-height: 74vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  background: #0d1513;
}

.hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 29, 27, 0.86), rgba(8, 29, 27, 0.48), rgba(8, 29, 27, 0.14)),
    linear-gradient(0deg, rgba(8, 29, 27, 0.38), transparent 50%);
}

.hero-content {
  position: relative;
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  padding: 5rem 0 4rem;
  color: #ffffff;
}

.hero-content > * {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #8ef1e5;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(3rem, 8vw, 6.5rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

h3 {
  font-size: 1.25rem;
}

.hero-copy {
  margin: 1.2rem 0 0;
  font-size: clamp(1.12rem, 2.2vw, 1.45rem);
}

.hero-actions,
.control-row,
.voice-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.hero-actions {
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  min-height: 3.15rem;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.9rem 1.2rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.button.primary {
  background: var(--accent);
  color: #ffffff;
}

.button.primary:hover:not(:disabled) {
  background: var(--accent-strong);
}

.button.secondary {
  border-color: rgba(255, 255, 255, 0.72);
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.button.danger {
  border-color: color-mix(in srgb, var(--coral) 40%, var(--border));
  background: color-mix(in srgb, var(--coral) 16%, var(--surface));
  color: var(--text);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  padding: 0;
  margin: 1.6rem 0 0;
  list-style: none;
}

.hero-points li {
  padding: 0.5rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.12);
}

.privacy-band {
  background: var(--accent);
  color: #ffffff;
}

.privacy-band > div {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 0;
  text-align: center;
}

.section {
  padding: clamp(3.5rem, 7vw, 6rem) clamp(1rem, 4vw, 3rem);
}

.section-heading,
.detector-grid,
.practice-layout,
.custom-layout,
.intelligence-layout,
.sign-grid,
.about-grid,
.feedback-form {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

.section-heading {
  margin-bottom: 2rem;
}

.section-heading p {
  max-width: 760px;
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.live-section,
.library-section,
.intelligence-section {
  background: var(--surface-strong);
}

.detector-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(310px, 0.65fr);
  gap: 1rem;
  align-items: stretch;
}

.camera-panel,
.translation-panel,
.practice-result,
.sign-card,
.feedback-form {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.camera-panel,
.translation-panel,
.practice-result {
  padding: clamp(1rem, 2vw, 1.4rem);
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.status-pill {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--gold) 18%, var(--surface));
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 800;
  white-space: nowrap;
}

.status-pill.ready,
.status-pill.correct {
  background: color-mix(in srgb, var(--success) 18%, var(--surface));
  color: var(--success);
}

.status-pill.error,
.status-pill.try-again {
  background: color-mix(in srgb, var(--error) 16%, var(--surface));
  color: var(--error);
}

.status-pill.soft {
  background: var(--surface-strong);
  color: var(--muted);
}

.video-stage {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 18%, transparent), transparent),
    #0d1513;
}

#cameraPreview,
#landmarkCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}

#cameraPreview {
  opacity: 0;
  transition: opacity 200ms ease;
}

#cameraPreview.is-active {
  opacity: 1;
}

#landmarkCanvas {
  pointer-events: none;
}

.empty-state {
  position: absolute;
  inset: 1rem;
  display: grid;
  place-content: center;
  gap: 0.35rem;
  color: #ffffff;
  text-align: center;
  background: rgba(10, 24, 22, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
}

.empty-state.is-hidden {
  display: none;
}

.control-row {
  margin-top: 1rem;
}

.status-text {
  margin: 0.9rem 0 0;
  color: var(--muted);
}

.detected-box {
  display: grid;
  gap: 0.45rem;
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
}

.response-box {
  display: grid;
  gap: 0.45rem;
  margin-top: 1rem;
  padding: 1.1rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
}

.label {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  text-transform: uppercase;
}

#detectedText {
  min-height: 4.8rem;
  display: flex;
  align-items: center;
  color: var(--text);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1;
}

#confidenceText {
  color: var(--muted);
}

#sourceShapeText {
  color: var(--muted);
  font-weight: 800;
}

#responseText {
  color: var(--text);
  font-size: clamp(1.25rem, 3vw, 1.9rem);
  font-weight: 900;
  line-height: 1.18;
}

.voice-controls {
  margin-top: 1rem;
  align-items: center;
}

.switch {
  min-height: 3.15rem;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font-weight: 800;
  cursor: pointer;
}

.switch input {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--accent);
}

.helper-note {
  display: grid;
  gap: 0.3rem;
  margin-top: 1rem;
  padding: 1rem;
  border-left: 4px solid var(--gold);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--gold) 13%, var(--surface));
  color: var(--muted);
}

.helper-note strong {
  color: var(--text);
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.42fr);
  gap: 1rem;
  align-items: stretch;
}

.practice-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-content: start;
}

.practice-chip {
  min-height: 3rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
}

.practice-chip.is-selected {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.practice-result {
  display: grid;
  gap: 0.35rem;
  align-content: center;
}

.practice-result strong {
  font-size: 2.2rem;
  line-height: 1;
}

.practice-result p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.practice-result.correct {
  border-color: color-mix(in srgb, var(--success) 55%, var(--border));
}

.practice-result.try-again {
  border-color: color-mix(in srgb, var(--error) 55%, var(--border));
}

.custom-section {
  background: var(--bg);
}

.custom-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.6fr);
  gap: 1rem;
  align-items: start;
}

.custom-form,
.intelligence-form,
.custom-list-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.custom-form,
.intelligence-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding: clamp(1rem, 3vw, 1.5rem);
}

.custom-form label,
.intelligence-form label {
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-weight: 800;
}

.custom-form input,
.custom-form select,
.custom-form textarea,
.intelligence-form input,
.intelligence-form select,
.intelligence-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  padding: 0.95rem 1rem;
}

.custom-form textarea,
.intelligence-form textarea {
  resize: vertical;
}

.custom-form .button,
.custom-form .status-text,
.intelligence-form .button,
.intelligence-form .status-text {
  grid-column: 1 / -1;
}

.custom-form .button,
.intelligence-form .button {
  width: min(100%, 260px);
}

.intelligence-section {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, transparent), transparent 36%),
    var(--bg);
}

.intelligence-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.58fr);
  gap: 1rem;
  align-items: start;
}

.community-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 2vw, 1.4rem);
}

.community-panel h3 {
  margin-bottom: 0.6rem;
}

.community-panel p {
  color: var(--muted);
  margin-top: 0;
}

.community-list {
  display: grid;
  gap: 0.8rem;
  margin-top: 1rem;
}

.community-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
  padding: 1rem;
}

.community-card h4 {
  margin: 0.4rem 0;
  font-size: 1.12rem;
}

.community-card p {
  margin: 0.5rem 0 0;
}

.email-note {
  margin: 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  color: var(--muted);
  font-weight: 800;
}

.custom-list-panel {
  padding: clamp(1rem, 2vw, 1.4rem);
}

.custom-list-panel h3 {
  margin-bottom: 1rem;
}

.custom-sign-list {
  display: grid;
  gap: 0.8rem;
}

.custom-card,
.empty-custom {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-strong);
  padding: 1rem;
}

.custom-card {
  display: grid;
  gap: 0.55rem;
}

.custom-card strong {
  font-size: 1.15rem;
}

.custom-card p,
.empty-custom {
  margin: 0;
  color: var(--muted);
}

.remove-custom {
  justify-self: start;
  min-height: 2.5rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid color-mix(in srgb, var(--error) 38%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--error) 12%, var(--surface));
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
}

.sign-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.sign-card {
  min-height: 100%;
  padding: 1rem;
}

.sign-card h3 {
  margin-bottom: 0.6rem;
}

.sign-card p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.sign-card.detectable {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
}

.card-meta,
.library-badge {
  display: inline-flex;
  min-height: 1.8rem;
  align-items: center;
  width: fit-content;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  font-size: 0.78rem;
  font-weight: 900;
}

.card-meta {
  margin-bottom: 0.65rem;
  background: color-mix(in srgb, var(--gold) 15%, var(--surface));
  color: var(--text);
}

.library-badge {
  margin-top: 0.85rem;
  background: var(--surface-strong);
  color: var(--muted);
}

.library-badge.detectable {
  background: color-mix(in srgb, var(--success) 16%, var(--surface));
  color: var(--success);
}

.response-line strong {
  color: var(--text);
}

.hand-shape {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 800;
}

.about-section {
  background: var(--bg);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(250px, 0.65fr) minmax(0, 1fr);
  gap: clamp(1rem, 4vw, 3rem);
}

.about-copy {
  color: var(--muted);
  font-size: 1.08rem;
}

.about-copy p:first-child {
  margin-top: 0;
}

.feedback-section {
  background: var(--surface-strong);
}

.feedback-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding: clamp(1rem, 3vw, 1.5rem);
}

.feedback-form label {
  display: grid;
  gap: 0.45rem;
  color: var(--muted);
  font-weight: 800;
}

.feedback-form input,
.feedback-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  padding: 0.95rem 1rem;
}

.feedback-form textarea {
  resize: vertical;
}

.full-span,
.feedback-form .button,
.feedback-form .status-text {
  grid-column: 1 / -1;
}

.feedback-form .button {
  width: min(100%, 230px);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  justify-content: space-between;
  padding: 1.2rem clamp(1rem, 4vw, 3rem);
  background: var(--surface);
  color: var(--muted);
  border-top: 1px solid var(--border);
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 0.2rem;
  }

  .hero {
    min-height: 68vh;
  }

  .detector-grid,
  .practice-layout,
  .custom-layout,
  .intelligence-layout,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .sign-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15px;
  }

  .site-header {
    padding: 0.75rem 1rem;
  }

  .brand-mark {
    width: 2.2rem;
    height: 2.2rem;
  }

  .theme-toggle {
    width: 100%;
  }

  .hero {
    min-height: 72vh;
  }

  .hero-shade {
    background: linear-gradient(0deg, rgba(8, 29, 27, 0.88), rgba(8, 29, 27, 0.52));
  }

  .hero-content {
    padding: 4rem 0 3rem;
  }

  .hero-actions .button,
  .control-row .button,
  .voice-controls .button,
  .switch {
    width: 100%;
  }

  .video-stage {
    aspect-ratio: 3 / 4;
  }

  .panel-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  #detectedText {
    min-height: 3.8rem;
  }

  .sign-grid,
  .custom-form,
  .intelligence-form,
  .feedback-form {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}