/* Kinetic Design System */

/* ── Tokens ── */
:root {
  /* Dark theme (default) */
  --bg-0: #0c0c10;
  --bg-1: #151519;
  --bg-2: #1e1e25;
  --bg-3: #27272f;
  --border: #2e2e3a;
  --border-hover: #40404f;

  --text-1: #e4e4ec;
  --text-2: #8585a0;
  --text-3: #555568;

  --accent: #7c5cfc;
  --accent-dim: rgba(124, 92, 252, 0.12);
  --accent-hover: #6a48e8;
  --secondary: #36b8a0;
  --secondary-dim: rgba(54, 184, 160, 0.10);

  --success: #3aae6a;
  --success-bg: rgba(58, 174, 106, 0.1);
  --error: #c94a4a;
  --error-bg: rgba(201, 74, 74, 0.1);
  --warning: #c89b3c;
  --warning-bg: rgba(200, 155, 60, 0.1);

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: clamp(1.5rem, 3vw, 2rem);

  --radius: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);

  --transition: 150ms ease;
  --transition-slow: 250ms ease;
}

/* ── Light Theme ── */
[data-theme="light"] {
  --bg-0: #f4f4f8;
  --bg-1: #ffffff;
  --bg-2: #ececf0;
  --bg-3: #e0e0e6;
  --border: #d0d0d8;
  --border-hover: #b0b0bc;

  --text-1: #1a1a28;
  --text-2: #5a5a70;
  --text-3: #9a9aac;

  --accent-dim: rgba(124, 92, 252, 0.08);
  --secondary-dim: rgba(54, 184, 160, 0.08);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-1);
  background: var(--bg-0);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* ── Header ── */
.header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-1);
}

.logo-icon { color: var(--accent); }

.logo-text {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-nav {
  display: flex;
  gap: 0.25rem;
}

.nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.nav-btn:hover {
  background: var(--bg-2);
  color: var(--text-1);
}

/* Theme toggle icons */
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }

/* ── Section ── */
.section { margin-top: 1.5rem; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-actions {
  display: flex;
  gap: 0.5rem;
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.section-sub {
  color: var(--text-2);
  font-size: var(--text-sm);
  margin-top: 0.25rem;
}

/* ── Model Grid ── */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
  margin-top: 1rem;
}

.model-card {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-1);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  text-align: center;
}

.model-card:hover { border-color: var(--border-hover); }

.model-card.active {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.model-name {
  font-size: var(--text-sm);
  font-weight: 600;
}

.model-badge {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--text-3);
  margin-top: 0.125rem;
}

.model-price {
  font-size: var(--text-xs);
  color: var(--text-2);
  font-family: var(--font-mono);
  margin-top: 0.25rem;
}

/* ── Mode Toggle ── */
.mode-toggle {
  display: flex;
  gap: 0;
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.mode-btn {
  flex: 1;
  padding: 0.5rem 1rem;
  border: none;
  background: var(--bg-1);
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.mode-btn:not(:last-child) { border-right: 1px solid var(--border); }

.mode-btn:hover { background: var(--bg-2); color: var(--text-1); }

.mode-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
}

/* ── Image Upload ── */
.image-uploads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1rem;
}

.upload-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-1);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color var(--transition);
  overflow: hidden;
}

.upload-zone:hover { border-color: var(--accent); }
.upload-zone.has-image { border-style: solid; }

.upload-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  color: var(--text-3);
  font-size: var(--text-sm);
}

.upload-hint { font-size: var(--text-xs); }

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

.upload-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* ── Form Elements ── */
.form-group { margin-top: 1rem; }

.prompt-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-1);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: var(--text-base);
  resize: vertical;
  min-height: 80px;
  transition: border-color var(--transition);
}

.prompt-input:focus {
  outline: none;
  border-color: var(--accent);
}

.prompt-input::placeholder { color: var(--text-3); }

.prompt-meta {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.25rem;
}

.char-count {
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
}

.form-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-1);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  transition: border-color var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-input::placeholder { color: var(--text-3); }

.control-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.control-select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-1);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: border-color var(--transition);
}

.control-select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Controls Row ── */
.controls-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.control-group { flex: 1; min-width: 0; }

/* ── Toggle Switch ── */
.toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: var(--text-sm);
}

.toggle input { display: none; }

.toggle-slider {
  width: 36px;
  height: 20px;
  background: var(--bg-3);
  border-radius: var(--radius-full);
  position: relative;
  transition: background var(--transition);
  flex-shrink: 0;
}

.toggle-slider::after {
  content: '';
  width: 16px;
  height: 16px;
  background: var(--text-2);
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: transform var(--transition), background var(--transition);
}

.toggle input:checked + .toggle-slider { background: var(--accent-dim); }
.toggle input:checked + .toggle-slider::after {
  transform: translateX(16px);
  background: var(--accent);
}

.toggle-label { color: var(--text-2); }

/* ── Advanced Panel ── */
.advanced-panel {
  margin-top: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-1);
}

.advanced-toggle {
  padding: 0.625rem 1rem;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition);
}

.advanced-toggle:hover { color: var(--text-1); }
.advanced-toggle::-webkit-details-marker { display: none; }

.advanced-toggle::before {
  content: '+';
  display: inline-block;
  margin-right: 0.5rem;
  font-family: var(--font-mono);
  transition: transform var(--transition);
}

.advanced-panel[open] .advanced-toggle::before { content: '-'; }

.advanced-body {
  padding: 0 1rem 1rem;
}

/* ── Generate Bar ── */
.generate-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-1);
}

.cost-estimate { display: flex; align-items: center; gap: 0.5rem; }

.cost-label {
  font-size: var(--text-sm);
  color: var(--text-2);
}

.cost-value {
  font-size: var(--text-lg);
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--accent);
}

.btn-generate {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  min-height: 44px;
}

.btn-generate:hover { background: var(--accent-hover); }
.btn-generate:active { transform: scale(0.98); }
.btn-generate:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-spinner.hidden { display: none; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  min-height: 44px;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-2);
  color: var(--text-1);
}

.btn-secondary:hover { background: var(--bg-3); }

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-2);
}

.btn-ghost:hover { color: var(--text-1); background: var(--bg-2); }

/* ── Progress ── */
.progress-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 1rem;
  text-align: center;
}

.progress-ring-wrap { position: relative; margin-bottom: 1.5rem; }

.progress-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress-status {
  font-size: var(--text-lg);
  font-weight: 600;
}

.progress-detail {
  font-size: var(--text-sm);
  color: var(--text-2);
  margin-top: 0.25rem;
}

.progress-logs {
  margin-top: 1rem;
  width: 100%;
  max-width: 480px;
  max-height: 120px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-3);
  text-align: left;
  padding: 0.5rem;
  background: var(--bg-1);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.progress-logs:empty { display: none; }

/* ── Result ── */
.result-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-1);
  overflow: hidden;
}

.result-video {
  width: 100%;
  display: block;
  background: #000;
}

.result-info { padding: 1rem; }

.result-prompt {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.6;
}

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.result-tag {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-2);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-2);
}

.result-actions {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
}

/* ── Compare ── */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.compare-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-1);
}

.compare-label {
  padding: 0.5rem 0.75rem;
  font-size: var(--text-sm);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}

.compare-video { width: 100%; display: block; background: #000; }

.compare-placeholder {
  padding: 2rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-2);
}

/* ── History ── */
.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.history-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-1);
  overflow: hidden;
  cursor: pointer;
  transition: border-color var(--transition);
}

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

.history-video {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
  background: #000;
}

.history-info { padding: 0.5rem 0.75rem; }

.history-prompt {
  font-size: var(--text-xs);
  color: var(--text-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.history-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 0.25rem;
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
}

.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 3rem 1rem;
  color: var(--text-3);
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 500;
  z-index: 200;
  opacity: 0;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.toast-error { background: var(--error); color: #fff; }
.toast.toast-success { background: var(--success); color: #fff; }
.toast.toast-info { background: var(--bg-3); color: var(--text-1); border: 1px solid var(--border); }

/* ── Utilities ── */
.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .model-grid { grid-template-columns: repeat(2, 1fr); }
  .controls-row { flex-direction: column; gap: 0.5rem; }
  .compare-grid { grid-template-columns: 1fr; }
  .image-uploads { grid-template-columns: 1fr; }
  .result-actions { flex-wrap: wrap; }
  .result-actions .btn { flex: 1; min-width: 120px; }
  .generate-bar { flex-direction: column; gap: 0.75rem; }
}

@media (max-width: 480px) {
  .main { padding: 1rem 0.75rem 2rem; }
  .section-title { font-size: var(--text-2xl); }
  .history-grid { grid-template-columns: 1fr; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}