:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e2229;
  --border: #2a2f3a;
  --text: #eef0f4;
  --muted: #9399a8;
  --accent: #5eead4;
  --accent-2: #34d399;
  --danger: #f87171;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 20% -10%, #1a2230 0%, transparent 60%),
              radial-gradient(1000px 500px at 100% 0%, #16241f 0%, transparent 55%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
  letter-spacing: 0.1px;
  overflow-x: hidden;
}

/* ---------- Shared animated background (bg.js) ---------- */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
}

#bg-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 55% at 50% 28%, rgba(8, 9, 13, 0.6), transparent 65%),
    rgba(8, 9, 13, 0.4);
}

h1, h2, h3, .nav-logo, .logo-text {
  font-family: "Space Grotesk", "Inter", sans-serif;
  letter-spacing: 0.2px;
}

.gradient-text {
  background: linear-gradient(120deg, var(--accent), #818cf8 50%, var(--accent-2));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% center; }
  50% { background-position: 100% center; }
  100% { background-position: 0% center; }
}

.app {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 96px 20px 60px;
}

/* ---------- Shared site nav ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(15, 17, 21, 0.65);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.3px;
}

.accent-text { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.15s ease;
}

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

@media (max-width: 720px) {
  .site-nav { padding: 14px 18px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 12px; }
}

.header {
  margin-bottom: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  font-size: 34px;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.brand h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.2px;
}

.tagline {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.8);
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: rgba(23, 26, 33, 0.6);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 60px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover {
  border-color: rgba(94, 234, 212, 0.4);
  box-shadow: 0 18px 40px -18px rgba(94, 234, 212, 0.25);
}

.dropzone.drag-over {
  border-color: var(--accent);
  background: var(--panel-2);
  box-shadow: 0 18px 40px -18px rgba(94, 234, 212, 0.35);
}

.dropzone-icon {
  font-size: 44px;
  margin-bottom: 8px;
}

.dropzone-title {
  font-size: 18px;
  font-weight: 600;
  margin: 4px 0;
}

.dropzone-sub {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.08s ease, filter 0.15s ease, opacity 0.15s ease;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06251f;
}

.btn-primary:hover { filter: brightness(1.08); }

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: none;
}

.btn-large {
  width: 100%;
  padding: 14px 22px;
  font-size: 16px;
  margin-top: 6px;
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  width: 100%;
  margin-top: 10px;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--muted);
}

.work-area {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 760px) {
  .work-area { grid-template-columns: 1fr; }
}

.panel {
  background: rgba(23, 26, 33, 0.6);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
  border-color: rgba(94, 234, 212, 0.3);
  box-shadow: 0 18px 40px -18px rgba(94, 234, 212, 0.2);
}

.preview-panel video,
.result-box video {
  width: 100%;
  border-radius: 10px;
  background: #000;
  display: block;
}

.meta {
  margin-top: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.options-panel h2 {
  margin: 0 0 16px;
  font-size: 17px;
}

.option-row {
  margin-bottom: 18px;
}

.option-row label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.pill {
  display: inline-block;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}

select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
  margin-top: 4px;
}

.value-tag {
  color: var(--accent);
  font-weight: 700;
}

.progress-wrap {
  margin-top: 18px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: var(--panel-2);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.2s ease;
}

.progress-label {
  color: var(--muted);
  font-size: 13px;
  margin: 8px 0 0;
  text-align: center;
}

.result-box {
  margin-top: 22px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.result-box h3 {
  margin: 0 0 12px;
  color: var(--accent-2);
}

.result-stats {
  display: flex;
  gap: 14px;
  margin-bottom: 14px;
}

.result-stats > div {
  flex: 1;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.stat-value {
  display: block;
  font-weight: 700;
  font-size: 15px;
  margin-top: 2px;
}

.stat-value.saved { color: var(--accent-2); }

.error-box {
  margin-top: 18px;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: var(--danger);
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 14px;
}

.hidden { display: none !important; }

.footer {
  margin-top: 40px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.9);
}