/* ============================================================
   Sultan vs Pathaan — Storyboard PWA
   Design System: Dark theme, green accent, cinematic feel
   Fonts: Syne (display) + IBM Plex Sans (body)
   ============================================================ */

/* --- Variables (Design Tokens) --- */
:root {
  /* Colors — OKLCH where possible, hex fallbacks for spec compliance */
  --color-bg: #111;
  --color-surface: #1a1a1a;
  --color-surface-elevated: #222;
  --color-accent: #00c853;
  --color-accent-dim: #00a844;
  --color-accent-glow: rgba(0, 200, 83, 0.15);
  --color-text: #e8e8e8;
  --color-text-muted: #888;
  --color-border: #2a2a2a;
  --color-danger: #ff4444;
  --color-srk: #ff3333;
  --color-salman: #3388ff;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;

  /* Easing */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-cinematic: cubic-bezier(0.16, 1, 0.3, 1);

  /* Grid */
  --grid-cols: 4;
  --grid-gap: var(--space-4);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  touch-action: manipulation;
}

/* --- Header --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: rgba(17, 17, 17, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.app-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.header-controls {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: transform 150ms var(--ease-out), background 200ms var(--ease-out), box-shadow 200ms var(--ease-out);
  user-select: none;
}

.btn:active {
  transform: scale(0.97);
}

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

.btn--secondary:hover {
  background: var(--color-surface-elevated);
  color: var(--color-text);
  border-color: var(--color-accent);
}

.btn--accent {
  background: var(--color-accent);
  color: #111;
  font-weight: 600;
}

.btn--accent:hover {
  background: var(--color-accent-dim);
  box-shadow: 0 0 16px var(--color-accent-glow);
}

.btn--toggle {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn--toggle-active {
  background: var(--color-accent);
  color: #111;
  border-color: var(--color-accent);
}

.btn--tool {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.btn--tool:hover,
.btn--tool.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --- Filter Bar --- */
.filter-bar {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: all 200ms var(--ease-out);
}

.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.filter-btn--active {
  background: var(--color-accent);
  color: #111;
  border-color: var(--color-accent);
  font-weight: 600;
}

/* --- Frame Grid --- */
.frame-grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols), 1fr);
  gap: var(--grid-gap);
  padding: var(--space-4) var(--space-6);
  padding-bottom: var(--space-8);
}

.frame-grid.compact {
  --grid-cols: 6;
  --grid-gap: var(--space-2);
}

/* --- Frame Card --- */
.frame-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-accent);
  background: var(--color-surface);
  cursor: pointer;
  transition: transform 300ms var(--ease-out), box-shadow 300ms var(--ease-out);
}

.frame-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 200, 83, 0.12);
}

.frame-card__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.frame-card__num {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  background: rgba(0, 0, 0, 0.75);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xs);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  line-height: 1.2;
}

.frame-card__aspect {
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-2);
  background: rgba(0, 0, 0, 0.75);
  color: var(--color-text-muted);
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  line-height: 1.2;
}

/* --- Insert Markers (between cards) --- */
.insert-marker {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 4px;
  position: relative;
  cursor: pointer;
  transition: height 200ms var(--ease-out);
}

.insert-marker::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-border);
  transition: background 200ms var(--ease-out);
}

.insert-marker:hover {
  height: 32px;
}

.insert-marker:hover::before {
  background: var(--color-accent);
  height: 2px;
}

.insert-marker__btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #111;
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1;
  z-index: 1;
  box-shadow: 0 2px 8px rgba(0, 200, 83, 0.3);
}

.insert-marker:hover .insert-marker__btn {
  display: flex;
}

/* --- Insert Row (full-width buttons) --- */
.insert-row {
  padding: var(--space-2) var(--space-6);
}

.insert-btn--full {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  transition: all 200ms var(--ease-out);
}

.insert-btn--full:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(0, 200, 83, 0.05);
}

.insert-plus {
  font-weight: 700;
  margin-right: var(--space-1);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(8px);
}

.lightbox__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-4);
}

.lightbox__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-3);
  flex-shrink: 0;
}

.lightbox__counter {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.lightbox__toggles {
  display: flex;
  gap: var(--space-1);
}

.lightbox__close {
  font-size: var(--text-2xl);
  color: var(--color-text-muted);
  line-height: 1;
  padding: var(--space-1);
  transition: color 200ms var(--ease-out);
}

.lightbox__close:hover {
  color: var(--color-text);
}

.lightbox__image-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 0;
}

.lightbox__image-container {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox__image {
  max-width: 100%;
  max-height: calc(100vh - 260px);
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
  color: var(--color-text-muted);
  padding: var(--space-4);
  z-index: 2;
  transition: color 200ms var(--ease-out);
}

.lightbox__nav:hover {
  color: var(--color-accent);
}

.lightbox__nav--prev { left: 0; }
.lightbox__nav--next { right: 0; }

.lightbox__description {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding: var(--space-3) 0;
  max-width: 65ch;
  margin: 0 auto;
  flex-shrink: 0;
}

.lightbox__tools {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-shrink: 0;
  padding-bottom: var(--space-2);
}

/* --- Tool Canvases --- */
.tool-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  cursor: crosshair;
}

.tool-canvas.active {
  display: block;
}

/* --- Toolbars --- */
.toolbar {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  z-index: 110;
  flex-wrap: wrap;
  justify-content: center;
}

.toolbar__group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.toolbar__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.toolbar__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all 150ms var(--ease-out);
}

.toolbar__btn:hover,
.toolbar__btn--active {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.toolbar__btn--srk.toolbar__btn--active {
  border-color: var(--color-srk);
  color: var(--color-srk);
}

.toolbar__btn--salman.toolbar__btn--active {
  border-color: var(--color-salman);
  color: var(--color-salman);
}

.toolbar__btn--danger {
  color: var(--color-danger);
  border-color: transparent;
}

.toolbar__btn--danger:hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.toolbar__color {
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
  padding: 0;
}

/* --- Notes Panel --- */
.notes-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 360px;
  max-width: 90vw;
  height: 100vh;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  z-index: 120;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 300ms var(--ease-cinematic);
}

.notes-panel.open {
  transform: translateX(0);
  display: flex;
}

.notes-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.notes-panel__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-accent);
}

.notes-panel__close {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  padding: var(--space-1);
}

.notes-panel__close:hover {
  color: var(--color-text);
}

.notes-panel__textarea {
  flex: 1;
  padding: var(--space-4);
  background: var(--color-bg);
  color: var(--color-text);
  border: none;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  resize: none;
  outline: none;
}

.notes-panel__textarea::placeholder {
  color: var(--color-text-muted);
}

/* --- Pool Picker --- */
.picker {
  position: fixed;
  inset: 0;
  z-index: 200;
  overflow-x: hidden;
}

.picker__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
}

.picker__content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: var(--space-8) auto;
  padding: var(--space-6);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  overflow-x: hidden;
}

.picker__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.picker__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-accent);
}

.picker__close {
  font-size: var(--text-2xl);
  color: var(--color-text-muted);
  padding: var(--space-1);
}

.picker__close:hover {
  color: var(--color-text);
}

.picker__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-3);
}

.picker__card {
  align-self: start;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: transform 200ms var(--ease-out), border-color 200ms var(--ease-out);
  background: var(--color-bg);
}

.picker__card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.picker__card img {
  width: 100%;
  display: block;
}

.picker__card-info {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.picker__empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-12);
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  :root {
    --grid-cols: 2;
    --grid-gap: var(--space-2);
  }

  .frame-grid.compact {
    --grid-cols: 3;
  }

  .app-header {
    padding: var(--space-3) var(--space-4);
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .app-title {
    font-size: var(--text-lg);
  }

  .filter-bar {
    padding: var(--space-2) var(--space-4);
  }

  .frame-grid {
    padding: var(--space-2) var(--space-4);
  }

  .insert-row {
    padding: var(--space-2) var(--space-4);
  }

  .insert-marker {
    height: 24px;
  }

  .insert-marker .insert-marker__btn {
    display: flex;
  }

  .toolbar {
    bottom: 100px;
    left: var(--space-2);
    right: var(--space-2);
    transform: none;
    max-width: calc(100vw - 1rem);
  }

  .lightbox__nav {
    font-size: 2rem;
    padding: var(--space-2);
  }

  .lightbox__image {
    max-height: calc(100vh - 320px);
  }

  .picker__content {
    margin: var(--space-4);
    padding: var(--space-4);
  }

  .picker__grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}