/* ==========================================================================
   Black Screen Online (black.livingthing.si)
   Apple Human Interface Guidelines & WWDC Dark Material Design System
   ========================================================================== */

:root {
  --color-black: #000000;
  --color-obsidian: #08080a;
  --color-surface-1: #0f1015;
  --color-surface-2: #161820;
  --color-surface-3: #1f222d;
  --color-surface-glass: rgba(18, 20, 28, 0.72);
  --color-glass-border: rgba(255, 255, 255, 0.1);
  --color-glass-border-hover: rgba(255, 255, 255, 0.22);

  --color-text-primary: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-text-tertiary: #6e6e73;

  --color-accent: #2997ff;
  --color-accent-hover: #0077ed;
  --color-accent-subtle: rgba(41, 151, 255, 0.15);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', var(--font-sans);

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 180ms var(--ease-apple);
  --transition-medium: 320ms var(--ease-apple);
  --transition-slow: 600ms var(--ease-apple);
}

/* ==========================================================================
   RESET & BASE SETUP
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.apple-dark {
  background-color: var(--color-black);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  line-height: 1.55;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  selection-background-color: var(--color-accent);
  selection-color: #ffffff;
}

::selection {
  background-color: rgba(41, 151, 255, 0.35);
  color: #ffffff;
}

/* Atmospheric Ambient Lights */
.ambient-glow {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.28;
}

.glow-top {
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 480px;
  background: radial-gradient(circle, rgba(41, 151, 255, 0.25) 0%, rgba(130, 80, 255, 0.12) 50%, transparent 80%);
}

.glow-bottom {
  bottom: -220px;
  right: 10%;
  width: 700px;
  height: 400px;
  background: radial-gradient(circle, rgba(50, 100, 200, 0.16) 0%, transparent 70%);
}

/* Layout Container */
.section-container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   APPLE FROSTED GLASS GLOBAL NAVIGATION
   ========================================================================== */

.apple-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--color-glass-border);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.nav-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.brand-icon-box {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #1c1d24, #0b0c10);
  border: 1px solid rgba(255, 255, 255, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.black-square-dot {
  width: 10px;
  height: 10px;
  background: #000000;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 2px;
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  margin-left: 4px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 6px 2px;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-glass-border);
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
}

.nav-menu-toggle:focus-visible,
.nav-link:focus-visible,
.apple-pill-btn:focus-visible,
.feature-toggle-btn:focus-visible,
.color-dot:focus-visible,
.dl-preset-card:focus-visible,
.mode-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.nav-parent-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-glass-border);
  transition: all var(--transition-fast);
}

.nav-parent-link:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-glass-border-hover);
}

.apple-pill-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #ffffff;
  color: #000000;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.14);
}

.apple-pill-btn:hover {
  background: #eaeaea;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(255, 255, 255, 0.22);
}

.apple-pill-btn:active {
  transform: translateY(0);
}

/* ==========================================================================
   HERO & INTERACTIVE BLACK SCREEN SECTION
   ========================================================================== */

.hero-section {
  padding: 56px 0 64px;
}

.hero-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 36px;
}

.apple-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #30d158;
  box-shadow: 0 0 10px #30d158;
  animation: pulseGreen 2.2s infinite ease-in-out;
}

@keyframes pulseGreen {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.85); }
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.8vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: #ffffff;
}

.headline-gradient {
  display: block;
  background: linear-gradient(135deg, #a1a1a6 0%, #6e6e73 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subhead {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  font-weight: 400;
  max-width: 680px;
  margin: 0 auto;
}

/* ==========================================================================
   THE MAIN INTERACTIVE BLACK SCREEN STAGE
   ========================================================================== */

.screen-stage-wrapper {
  background: var(--color-obsidian);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: 0 24px 64px -12px rgba(0, 0, 0, 0.8),
              0 0 0 1px rgba(255, 255, 255, 0.05);
  position: relative;
  transition: border-color var(--transition-fast);
}

.screen-viewport {
  width: 100%;
  height: 520px;
  max-height: 62vh;
  background-color: #000000;
  border-radius: 18px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 32px rgba(0, 0, 0, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
  user-select: none;
}

.screen-viewport:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* Fullscreen Mode State for Screen Viewport */
.screen-viewport:fullscreen,
.screen-viewport:-webkit-full-screen {
  width: 100vw !important;
  height: 100vh !important;
  max-height: 100vh !important;
  border-radius: 0 !important;
  border: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

/* Hide prompt card completely when in fullscreen */
.screen-viewport:fullscreen .canvas-prompt,
.screen-viewport:-webkit-full-screen .canvas-prompt,
:fullscreen .canvas-prompt,
:-webkit-full-screen .canvas-prompt,
.screen-viewport.is-fullscreen .canvas-prompt {
  display: none !important;
}

/* Auto-hide Cursor in Fullscreen */
.screen-viewport.cursor-hidden {
  cursor: none !important;
}
.screen-viewport.cursor-hidden * {
  cursor: none !important;
}

/* Center Content inside Viewport */
.canvas-center-content {
  position: relative;
  z-index: 5;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

/* Default Prompt Card */
.canvas-prompt {
  background: rgba(18, 20, 26, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 20px;
  padding: 24px 36px;
  transition: all var(--transition-medium);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
}

.screen-viewport:hover .canvas-prompt {
  transform: scale(1.03);
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(24, 26, 34, 0.75);
}

.prompt-icon-ring {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: #ffffff;
  margin-bottom: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.prompt-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.prompt-desc {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}

.prompt-desc kbd,
.hud-hint kbd,
.legend-item kbd,
.faq-answer kbd {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.78rem;
  font-family: var(--font-sans);
  color: #ffffff;
  font-weight: 600;
}

/* Digital Clock Display */
.canvas-clock-wrap {
  pointer-events: none;
  animation: fadeIn var(--transition-medium);
}

.clock-time {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 9vw, 7rem);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.92);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.8);
}

.clock-date {
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 400;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Timer Display */
.canvas-timer-wrap {
  pointer-events: none;
  animation: fadeIn var(--transition-medium);
}

.timer-display {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 7.5rem);
  font-weight: 800;
  color: rgba(255, 255, 255, 0.95);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.8);
}

.timer-label {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* DVD Bouncing Canvas */
#dvd-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* ==========================================================================
   FULLSCREEN FLOATING CONTROLS HUD
   ========================================================================== */

.fullscreen-hud {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: calc(100% - 40px);
  max-width: 960px;
  padding: 10px 18px;
  background: rgba(18, 20, 26, 0.72);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7);
  opacity: 1;
  pointer-events: auto;
  transition: opacity var(--transition-medium), transform var(--transition-medium);
}

/* Hidden HUD during idle in fullscreen */
.screen-viewport.cursor-hidden .fullscreen-hud {
  opacity: 0;
  transform: translateX(-50%) translateY(-15px);
  pointer-events: none;
}

.hud-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hud-status {
  font-size: 0.78rem;
  font-weight: 600;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.hud-hint {
  font-size: 0.76rem;
  color: var(--color-text-secondary);
}

.hud-center {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-tool-btn {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.hud-tool-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.14);
}

.hud-tool-btn.active {
  color: #ffffff;
  background: var(--color-accent);
}

.hud-right {
  display: flex;
  align-items: center;
}

.hud-close-btn {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.hud-close-btn:hover {
  background: rgba(255, 255, 255, 0.22);
}

/* Hide HUD by default when not in fullscreen or preview */
.screen-viewport:not(:fullscreen) .fullscreen-hud {
  display: none;
}

/* ==========================================================================
   STAGE CONTROLS BAR (BELOW BLACK CANVAS)
   ========================================================================== */

.stage-controls-bar {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.controls-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.launch-big-btn {
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 700;
}

/* Color Palette Pills */
.color-palette-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-glass-border);
}

.color-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.3);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  outline: none;
}

.color-dot:hover {
  transform: scale(1.18);
}

.color-dot.active {
  transform: scale(1.22);
  border: 2px solid #ffffff;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

.color-black { background-color: #000000; border-color: rgba(255, 255, 255, 0.4); }
.color-obsidian { background-color: #0c0d10; }
.color-navy { background-color: #06090e; }
.color-white { background-color: #ffffff; }
.color-red { background-color: #ff0000; }
.color-green { background-color: #00ff00; }
.color-blue { background-color: #0000ff; }
.color-gray { background-color: #808080; }

.controls-right {
  display: flex;
  align-items: center;
}

.toggle-pill-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.feature-toggle-btn {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-glass-border);
  padding: 8px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.feature-toggle-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.18);
}

.feature-toggle-btn.active {
  background: rgba(41, 151, 255, 0.22);
  color: #ffffff;
  border-color: var(--color-accent);
}

/* ==========================================================================
   AMBIENT AUDIO SYNTHESIZER CARD
   ========================================================================== */

.ambient-sound-card {
  margin-top: 14px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  border: 1px solid rgba(41, 151, 255, 0.25);
  animation: fadeInDown var(--transition-fast);
}

.sound-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.sound-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sound-icon {
  font-size: 1.25rem;
  color: var(--color-accent);
}

.sound-title {
  font-size: 0.96rem;
  font-weight: 600;
  color: #ffffff;
}

.sound-sub {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

.sound-switch-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.noise-type-btn {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-glass-border);
  padding: 6px 13px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.noise-type-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

.noise-type-btn.active {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.sound-volume-slider-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.84rem;
  color: var(--color-text-secondary);
}

.apple-slider {
  flex: 1;
  max-width: 240px;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: rgba(255, 255, 255, 0.16);
  border-radius: 3px;
  outline: none;
}

.apple-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #ffffff;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
  transition: transform var(--transition-fast);
}

.apple-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.vol-val {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: #ffffff;
  min-width: 36px;
}

/* ==========================================================================
   SHORTCUTS LEGEND BAR
   ========================================================================== */

.shortcuts-legend-bar {
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

.legend-title {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.legend-items {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   SECTION COMMON STYLES
   ========================================================================== */

.section {
  padding: 80px 0;
  position: relative;
  z-index: 1;
}

.section-intro {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.8vw, 2.9rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: #ffffff;
  margin-bottom: 16px;
}

.text-secondary {
  color: var(--color-text-secondary);
  font-weight: 600;
}

.section-desc {
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   SECTION 2: MODES GRID & TESTING SUITE
   ========================================================================== */

.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.mode-card {
  background: var(--color-obsidian);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-medium), border-color var(--transition-medium), box-shadow var(--transition-medium);
  display: flex;
  flex-direction: column;
}

.mode-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-glass-border-hover);
  box-shadow: 0 16px 36px -10px rgba(0, 0, 0, 0.7);
}

.mode-preview-swatch {
  height: 130px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 12px;
}

.bg-pure-black { background-color: #000000; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.bg-obsidian { background-color: #0c0d10; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.bg-pure-white { background-color: #ffffff; }
.bg-rgb-gradient { background: linear-gradient(135deg, #ff0000 0%, #00ff00 50%, #0000ff 100%); }

.mode-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  color: #ffffff;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.mode-tag.tag-dark {
  background: rgba(255, 255, 255, 0.85);
  color: #000000;
  border-color: rgba(0, 0, 0, 0.2);
}

.mode-info {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.mode-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.mode-desc {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  flex: 1;
}

.mode-desc code {
  font-size: 0.78rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 5px;
  border-radius: 4px;
  color: #ffffff;
}

.mode-action-link {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition-fast);
}

.mode-card:hover .mode-action-link {
  gap: 10px;
}

/* Color Temperature Slider Box */
.temp-slider-box {
  background: var(--color-obsidian);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-top: 24px;
}

.temp-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.temp-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.temp-desc {
  font-size: 0.86rem;
  color: var(--color-text-secondary);
}

.temp-readout {
  text-align: right;
}

.temp-kelvin {
  display: block;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: #ffffff;
}

.temp-name {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.slider-track-wrap {
  width: 100%;
}

.apple-temp-range {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg, #ff8912 0%, #ffc885 25%, #ffeacc 50%, #d8e5ff 75%, #a4c2ff 100%);
  outline: none;
  margin-bottom: 12px;
}

.apple-temp-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid #1c1d24;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.apple-temp-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.temp-milestones {
  display: flex;
  justify-content: space-between;
  font-size: 0.74rem;
  color: var(--color-text-tertiary);
  font-weight: 500;
  flex-wrap: wrap;
  gap: 8px;
}

/* ==========================================================================
   SECTION 3: WALLPAPER DOWNLOAD GENERATOR (4K / 8K / CUSTOM)
   ========================================================================== */

.downloads-glass-card {
  background: var(--color-obsidian);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.download-presets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.dl-preset-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.dl-preset-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-glass-border-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
}

.preset-res {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.preset-dims {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  margin-bottom: 4px;
}

.preset-label {
  font-size: 0.74rem;
  color: var(--color-text-tertiary);
}

/* Custom Dimension Form */
.custom-res-form {
  padding-top: 24px;
  border-top: 1px solid var(--color-glass-border);
  text-align: center;
}

.custom-inputs-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 12px;
}

.input-field {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--color-text-secondary);
}

.input-field input {
  width: 100px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-sm);
  color: #ffffff;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  outline: none;
  transition: border-color var(--transition-fast);
}

.input-field input:focus {
  border-color: var(--color-accent);
}

.times-sign {
  color: var(--color-text-tertiary);
  font-size: 1.1rem;
}

.dl-custom-btn {
  background: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(41, 151, 255, 0.3);
}

.dl-custom-btn:hover {
  background: var(--color-accent-hover);
}

.custom-note {
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
}

/* ==========================================================================
   SECTION 4: APPLE BENTO GRID FOR USE CASES
   ========================================================================== */

.apple-bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

.bento-card {
  background: var(--color-obsidian);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: border-color var(--transition-medium), transform var(--transition-medium);
}

.bento-card:hover {
  border-color: var(--color-glass-border-hover);
  transform: translateY(-2px);
}

.bento-span-7 { grid-column: span 7; }
.bento-span-5 { grid-column: span 5; }
.bento-span-6 { grid-column: span 6; }

.bento-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(41, 151, 255, 0.12);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}

.bento-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.25;
  color: #ffffff;
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}

.bento-text {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

.bento-text code {
  font-size: 0.82rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #ffffff;
}

/* ==========================================================================
   SECTION 5: FREQUENTLY ASKED QUESTIONS
   ========================================================================== */

.faq-accordion-group {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.apple-faq-item {
  background: var(--color-obsidian);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.apple-faq-item[open] {
  border-color: rgba(255, 255, 255, 0.22);
}

.faq-summary {
  padding: 20px 24px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-arrow {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  transition: transform var(--transition-fast);
}

.apple-faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: #ffffff;
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

.faq-answer strong {
  color: #ffffff;
}

/* ==========================================================================
   APPLE FOOTER
   ========================================================================== */

.apple-footer {
  border-top: 1px solid var(--color-glass-border);
  background: #000000;
  padding: 64px 0 36px;
  margin-top: 60px;
  position: relative;
  z-index: 1;
}

.footer-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-top-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-dot {
  width: 8px;
  height: 8px;
  background: #ffffff;
  border-radius: 50%;
}

.footer-desc {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  max-width: 320px;
}

.footer-links-inline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8rem;
}

.footer-links-inline a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links-inline a:hover {
  color: #ffffff;
}

.footer-links-inline span {
  color: var(--color-text-tertiary);
}

.footer-col-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.84rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: #ffffff;
}

.footer-privacy-text {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-text-tertiary);
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  color: var(--color-text-tertiary);
}

/* ==========================================================================
   KEYFRAME ANIMATIONS & RESPONSIVE RULES
   ========================================================================== */

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1100px) {
  .nav-links {
    display: none;
  }

  .nav-menu-toggle {
    display: inline-flex;
  }

  .apple-nav.menu-open .nav-links {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: flex;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
    background: rgba(0, 0, 0, 0.96);
    border-bottom: 1px solid var(--color-glass-border);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.45);
  }

  .apple-nav.menu-open .nav-link {
    padding: 12px 4px;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
}

@media (max-width: 992px) {

  .apple-bento-grid {
    grid-template-columns: 1fr;
  }

  .bento-span-7, .bento-span-5, .bento-span-6 {
    grid-column: span 1;
  }

  .footer-top-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .section-container,
  .footer-container {
    padding-right: 18px;
    padding-left: 18px;
  }

  .nav-container {
    gap: 10px;
    padding: 10px 16px;
  }

  .nav-brand {
    min-width: 0;
    gap: 8px;
    font-size: 0.9rem;
  }

  .brand-title {
    white-space: nowrap;
  }

  .brand-badge,
  .nav-parent-link {
    display: none;
  }

  .nav-actions {
    margin-left: auto;
  }

  .nav-fs-btn {
    width: 42px;
    height: 42px;
    padding: 0;
  }

  .nav-fs-btn span {
    display: none;
  }

  .hero-section {
    padding: 36px 0 48px;
  }

  .hero-header {
    margin-bottom: 24px;
  }

  .apple-pill-badge {
    max-width: 100%;
    justify-content: center;
    font-size: 0.7rem;
    padding: 6px 10px;
  }

  .hero-headline {
    font-size: clamp(2.1rem, 9vw, 3rem);
  }

  .hero-subhead {
    font-size: 0.94rem;
  }

  .screen-stage-wrapper {
    padding: 10px;
    border-radius: 18px;
  }

  .screen-viewport {
    height: min(380px, 58svh);
    min-height: 240px;
    border-radius: 13px;
  }

  .canvas-prompt {
    max-width: calc(100vw - 64px);
    padding: 20px 16px;
  }

  .prompt-title {
    font-size: 1.1rem;
  }

  .prompt-desc {
    font-size: 0.78rem;
  }

  .stage-controls-bar {
    gap: 12px;
    padding: 12px;
  }

  .stage-controls-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .controls-left, .controls-right {
    width: 100%;
    justify-content: center;
  }

  .controls-left {
    gap: 12px;
  }

  .launch-big-btn {
    width: 100%;
    min-height: 44px;
  }

  .color-palette-pills {
    gap: 7px;
    padding: 8px;
  }

  .color-dot {
    width: 24px;
    height: 24px;
  }

  .toggle-pill-group {
    gap: 8px;
  }

  .feature-toggle-btn {
    min-height: 42px;
    justify-content: center;
    flex: 1 1 calc(50% - 8px);
  }

  .ambient-sound-card {
    padding: 14px;
  }

  .sound-title-row {
    align-items: flex-start;
  }

  .sound-switch-row {
    width: 100%;
  }

  .noise-type-btn {
    flex: 1 1 calc(50% - 8px);
    min-height: 40px;
  }

  .shortcuts-legend-bar {
    justify-content: flex-start;
    gap: 8px;
  }

  .legend-items {
    gap: 8px 12px;
  }

  .section {
    padding: 56px 0;
  }

  .section-intro {
    margin-bottom: 32px;
  }

  .section-title {
    font-size: clamp(1.8rem, 8vw, 2.4rem);
  }

  .section-desc {
    font-size: 0.94rem;
  }

  .modes-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .temp-slider-box,
  .downloads-glass-card {
    padding: 22px 18px;
  }

  .temp-header {
    align-items: flex-start;
    margin-bottom: 20px;
  }

  .temp-readout {
    text-align: left;
  }

  .temp-milestones {
    font-size: 0.68rem;
  }

  .download-presets-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .dl-preset-card {
    min-width: 0;
    padding: 16px 8px;
  }

  .preset-res {
    font-size: 1rem;
  }

  .preset-dims,
  .preset-label {
    font-size: 0.68rem;
  }

  .custom-inputs-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 10px;
  }

  .input-field {
    min-width: 0;
    align-items: stretch;
    flex-direction: column;
    text-align: left;
    gap: 6px;
  }

  .input-field input {
    width: 100%;
  }

  .times-sign {
    align-self: end;
    padding-bottom: 9px;
  }

  .dl-custom-btn {
    grid-column: 1 / -1;
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
  }

  .bento-card {
    padding: 26px 22px;
  }

  .faq-summary {
    gap: 12px;
    padding: 17px 18px;
    font-size: 0.96rem;
  }

  .faq-answer {
    padding: 0 18px 18px;
    font-size: 0.88rem;
  }

  .color-palette-pills {
    width: auto;
    max-width: 100%;
  }

  .toggle-pill-group {
    width: 100%;
    justify-content: center;
  }

  .footer-top-row {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 32px;
  }

  .footer-bottom-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .apple-footer {
    padding: 48px 0 28px;
    margin-top: 32px;
  }
}

@media (max-width: 380px) {
  .nav-container {
    padding-right: 12px;
    padding-left: 12px;
  }

  .brand-icon-box {
    width: 25px;
    height: 25px;
  }

  .nav-menu-toggle,
  .nav-fs-btn {
    width: 38px;
    height: 38px;
  }

  .color-palette-pills {
    gap: 5px;
    padding: 7px;
  }

  .color-dot {
    width: 22px;
    height: 22px;
  }
}