/* DeepFake Detection — design system (fonts loaded in base.html) */

:root {
  --bg-deep: #06080f;
  --bg-elevated: #0c1019;
  --bg-card: rgba(15, 20, 32, 0.85);
  --border: rgba(99, 130, 255, 0.18);
  --border-hover: rgba(129, 140, 248, 0.45);
  --text: #e8ecf4;
  --text-muted: #8b95a8;
  --accent: #6366f1;
  --accent-2: #22d3ee;
  --accent-glow: rgba(99, 102, 241, 0.35);
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --radius: 14px;
  --radius-lg: 20px;
  --font: 'DM Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-deep);
  min-height: 100vh;
}

/* Ambient background */
.app-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(99, 102, 241, 0.22), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(34, 211, 238, 0.12), transparent),
    radial-gradient(ellipse 50% 50% at 50% 100%, rgba(139, 92, 246, 0.1), transparent),
    var(--bg-deep);
}

#particles-js {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1 !important;
  pointer-events: none !important;
}

#particles-js canvas {
  display: block;
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
  z-index: 1 !important;
  pointer-events: none !important;
}

.app-shell {
  position: relative;
  z-index: 5;
  isolation: isolate;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-main {
  flex: 1;
  position: relative;
  z-index: 2;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ——— Navbar ——— */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(6, 8, 15, 0.82);
  backdrop-filter: blur(16px);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.brand__icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.95rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(99, 102, 241, 0.12);
}

.nav-link--active {
  color: var(--text);
  background: rgba(99, 102, 241, 0.2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1.15rem;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #4f46e5 100%);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 8px 28px var(--accent-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.1);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: 12px;
}

/* ——— Cards ——— */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.section {
  padding: 4rem 0;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  text-align: center;
  margin: 0 0 0.75rem;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  max-width: 36rem;
  margin: 0 auto 2.5rem;
  font-size: 1.05rem;
}

/* ——— Hero ——— */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-2);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.25);
  margin-bottom: 1.25rem;
}

.hero__title {
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin: 0 0 1rem;
  color: #f1f5f9;
}

.hero__sub {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 32rem;
  margin: 0 auto 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* ——— Media type cards ——— */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.media-tile {
  padding: 1.75rem;
  text-align: center;
  transition: border-color 0.25s, transform 0.25s;
}

.media-tile:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.media-tile__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.media-tile__icon--image {
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

.media-tile__icon--video {
  background: rgba(168, 85, 247, 0.2);
  color: #d8b4fe;
}

.media-tile__icon--audio {
  background: rgba(34, 211, 238, 0.15);
  color: var(--accent-2);
}

.media-tile h3 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}

.media-tile p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ——— Stats ——— */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.stat-box {
  padding: 1.25rem;
  text-align: center;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

.stat-box__value {
  font-size: 1.75rem;
  font-weight: 700;
  font-family: var(--mono);
  color: var(--accent-2);
}

.stat-box__label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ——— Features ——— */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.feature-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.2s;
}

.feature-item:hover {
  border-color: var(--border-hover);
}

.feature-item__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.feature-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ——— Auth ——— */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding: 2rem 1rem;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 2rem;
}

.auth-card h1 {
  margin: 0 0 0.35rem;
  font-size: 1.5rem;
  text-align: center;
}

.auth-card .auth-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-input,
.auth-card input[type="text"],
.auth-card input[type="password"],
.auth-card input[type="email"],
.upload-card input[type="file"],
.upload-card select,
.upload-card textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--text);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus,
.auth-card input:focus,
.upload-card input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-error {
  padding: 0.75rem;
  border-radius: 10px;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: var(--danger);
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

.auth-footer {
  text-align: center;
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.auth-footer a {
  color: var(--accent-2);
  font-weight: 600;
  text-decoration: none;
}

.auth-footer a:hover { text-decoration: underline; }

/* ——— Upload / analysis pages ——— */
.upload-page {
  padding: 2rem 0 4rem;
}

.upload-header {
  text-align: center;
  margin-bottom: 2rem;
}

.upload-header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.upload-header p {
  margin: 0;
  color: var(--text-muted);
}

.upload-card {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
}

.upload-drop {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  margin-bottom: 1.25rem;
  transition: border-color 0.2s, background 0.2s;
}

.upload-drop:hover {
  border-color: var(--border-hover);
  background: rgba(99, 102, 241, 0.05);
}

.upload-drop label {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.upload-drop input[type="file"] {
  margin-top: 1rem;
}

.results-panel {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.results-panel h2 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.result-box {
  padding: 1.25rem;
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
}

.result-box h3 {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  color: var(--accent-2);
}

.result-box img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.prediction-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 700;
  font-family: var(--mono);
}

.prediction-badge--real {
  background: rgba(52, 211, 153, 0.15);
  color: var(--success);
  border: 1px solid rgba(52, 211, 153, 0.35);
}

.prediction-badge--fake {
  background: rgba(248, 113, 113, 0.15);
  color: var(--danger);
  border: 1px solid rgba(248, 113, 113, 0.35);
}

.loader-ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 2rem;
}

.loader-ring__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.metadata-container {
  max-width: 100%;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-word;
}

.alert-error {
  padding: 1rem;
  border-radius: 10px;
  background: rgba(248, 113, 113, 0.12);
  color: var(--danger);
  border: 1px solid rgba(248, 113, 113, 0.3);
}

/* ——— Footer ——— */
.site-footer {
  margin-top: auto;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.35);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.site-footer h4 {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.site-footer a:hover { color: var(--accent-2); }

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li { margin-bottom: 0.4rem; }

.site-footer__copy {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hidden { display: none !important; }

.form-container {
  position: relative;
  z-index: 1;
}

@media (max-width: 640px) {
  .nav-links .nav-link span.hide-mobile { display: none; }
  .hero { padding-top: 3rem; }
}