/* ========== DESIGN TOKENS ========== */
:root {
  --bg-primary: #1a110a;
  --bg-secondary: #2d1f14;
  --surface: rgba(45, 31, 20, 0.85);
  --text-primary: #f5e6d3;
  --text-secondary: #c4a882;
  --accent: #e8913a;
  --accent-glow: #f4a853;
  --accent-dim: #b36a1e;
  --ring-bg: rgba(232, 145, 58, 0.12);
  --ring-progress: #e8913a;
  --ring-break: #5dba5d;
  --btn-bg: rgba(232, 145, 58, 0.15);
  --btn-hover: rgba(232, 145, 58, 0.3);
  --btn-active: rgba(232, 145, 58, 0.4);
  --panel-bg: rgba(26, 17, 10, 0.95);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
  --font-body: -apple-system, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --timer-size: clamp(3.5rem, 12vw, 7rem);

  /* Scene tuning:
     Keep photos brighter/cleaner while preserving UI legibility. */
  --bg-brightness: 0.88;
  --bg-saturation: 1.10;
  --overlay-vignette: 0.22; /* outer edges */
  --overlay-edge: 0.14;     /* top/bottom gradient */
  --ui-text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);

  /* Scene selector chips (inactive buttons) */
  --chip-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);

  /* Secondary controls (Reset/Skip) need stronger contrast on photos */
  --ctrl-secondary-bg: rgba(10, 10, 10, 0.42);
  --ctrl-secondary-hover: rgba(10, 10, 10, 0.55);
  --ctrl-secondary-border: rgba(255, 255, 255, 0.16);
  --ctrl-secondary-border-hover: rgba(232, 145, 58, 0.35);
  --ctrl-secondary-text: rgba(245, 230, 211, 0.92);
  --ctrl-secondary-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);

  /* Glass buttons (primary + active chips) */
  --glass-bg: rgba(245, 230, 211, 0.16);
  --glass-bg-hover: rgba(245, 230, 211, 0.22);
  --glass-border: rgba(255, 255, 255, 0.26);
  --glass-border-hover: rgba(255, 255, 255, 0.36);
  --glass-shadow: 0 16px 38px rgba(0, 0, 0, 0.28);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.25);

  /* Glass scene chips (inactive) */
  --glass-chip-top: rgba(255, 255, 255, 0.18);
  --glass-chip-bottom: rgba(255, 255, 255, 0.10);
  --glass-chip-top-hover: rgba(255, 255, 255, 0.24);
  --glass-chip-bottom-hover: rgba(255, 255, 255, 0.14);
  --glass-chip-text: rgba(245, 230, 211, 0.80);

}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(232, 145, 58, 0.2);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(232, 145, 58, 0.4);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 8px rgba(232, 145, 58, 0.4);
}

input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ========== SCENE LAYERS ========== */
.scene-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  transition: opacity 0.8s ease;
}

#scene-canvas {
  z-index: 1;
}

#overlay {
  z-index: 2;
  background:
    radial-gradient(ellipse at center, transparent 35%, rgba(0, 0, 0, var(--overlay-vignette)) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, var(--overlay-edge)) 0%, transparent 28%, transparent 72%, rgba(0, 0, 0, var(--overlay-edge)) 100%);
  pointer-events: none;
}

.scene-transitioning #scene-bg,
.scene-transitioning #scene-canvas {
  opacity: 0;
}

/* ========== SCENE BACKGROUNDS (Photo + Ken Burns) ========== */
#scene-bg {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  filter: brightness(var(--bg-brightness)) saturate(var(--bg-saturation));
  transform-origin: center center;
  will-change: transform;
}

/* Ken Burns: slow zoom + pan, each scene has a different direction */
[data-scene="cafe"] #scene-bg {
  --bg-brightness: 0.90;
  --bg-saturation: 1.12;
  --overlay-vignette: 0.20;
  --overlay-edge: 0.12;
  animation: kb-cafe 30s ease-in-out infinite alternate;
}

[data-scene="rain"] #scene-bg {
  --bg-brightness: 0.86;
  --bg-saturation: 1.00;
  --overlay-vignette: 0.24;
  --overlay-edge: 0.16;
  animation: kb-rain 35s ease-in-out infinite alternate;
}

[data-scene="fireplace"] #scene-bg {
  --bg-brightness: 0.88;
  --bg-saturation: 1.18;
  --overlay-vignette: 0.22;
  --overlay-edge: 0.14;
  animation: kb-fire 25s ease-in-out infinite alternate;
}

[data-scene="night"] #scene-bg {
  --bg-brightness: 0.80;
  --bg-saturation: 1.10;
  --overlay-vignette: 0.32;
  --overlay-edge: 0.20;
  animation: kb-night 40s ease-in-out infinite alternate;
}

[data-scene="forest"] #scene-bg {
  --bg-brightness: 0.86;
  --bg-saturation: 1.10;
  --overlay-vignette: 0.24;
  --overlay-edge: 0.16;
  animation: kb-forest 35s ease-in-out infinite alternate;
}

@keyframes kb-cafe {
  0%   { transform: scale(1.0) translate(0, 0); }
  100% { transform: scale(1.15) translate(-2%, 1%); }
}

@keyframes kb-rain {
  0%   { transform: scale(1.05) translate(1%, 0); }
  100% { transform: scale(1.15) translate(-1%, -2%); }
}

@keyframes kb-fire {
  0%   { transform: scale(1.0) translate(0, -1%); }
  100% { transform: scale(1.12) translate(1%, 1%); }
}

@keyframes kb-night {
  0%   { transform: scale(1.0) translate(0, 0); }
  100% { transform: scale(1.1) translate(-1%, -1%); }
}

@keyframes kb-forest {
  0%   { transform: scale(1.05) translate(-1%, 0); }
  100% { transform: scale(1.15) translate(1%, -1%); }
}

/* ========== APP LAYOUT ========== */
#app {
  position: relative;
  z-index: 3;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1rem;
  transition: opacity var(--transition);
}

/* ========== TOP BAR ========== */
#top-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem;
  transition: opacity 0.5s ease;
  text-shadow: var(--ui-text-shadow);
}

#btn-lang {
  width: 80px;
}

#app-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-align: center;
}

.top-actions {
  display: flex;
  gap: 0.25rem;
  width: 80px;
  justify-content: flex-end;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition);
  font-size: 0.8rem;
  font-weight: 600;
}

.icon-btn:hover {
  background: var(--btn-hover);
  color: var(--text-primary);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.icon-btn.sound-on {
  color: var(--accent);
}

/* ========== TIMER SECTION ========== */
#timer-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  flex: 1;
  justify-content: center;
  text-shadow: var(--ui-text-shadow);
}

#session-type {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Timer ring */
#timer-ring {
  position: relative;
  width: clamp(200px, 50vw, 300px);
  height: clamp(200px, 50vw, 300px);
}

#timer-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--ring-bg);
  stroke-width: 5;
}

.ring-progress {
  fill: none;
  stroke: var(--ring-progress);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 565.48;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear;
  filter:
    drop-shadow(0 12px 22px rgba(0, 0, 0, 0.22));
}

#timer-display {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--timer-size);
  font-weight: 300;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

/* Session counter dots */
#session-counter {
  display: flex;
  justify-content: center;
  min-height: 20px;
}

#pomo-dots {
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.16) 0%, rgba(255, 255, 255, 0.08) 100%);
  border: 1px solid rgba(255, 255, 255, 0.20);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22), var(--glass-highlight);
}

.pomo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ring-bg);
  transition: all var(--transition);
}

.pomo-dot.filled {
  background: var(--accent);
  box-shadow: 0 0 6px rgba(232, 145, 58, 0.4);
}

/* Timer controls */
#timer-controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.ctrl-btn {
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  letter-spacing: 0.03em;
}

.ctrl-btn.primary {
  background: linear-gradient(180deg, rgba(245, 230, 211, 0.22) 0%, rgba(245, 230, 211, 0.12) 100%);
  color: var(--text-primary);
  min-width: 100px;
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.ctrl-btn.primary:hover {
  background: linear-gradient(180deg, rgba(245, 230, 211, 0.28) 0%, rgba(245, 230, 211, 0.16) 100%);
  border-color: var(--glass-border-hover);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.ctrl-btn.secondary {
  background: var(--ctrl-secondary-bg);
  color: var(--ctrl-secondary-text);
  border: 1px solid var(--ctrl-secondary-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--ctrl-secondary-shadow);
}

.ctrl-btn.secondary:hover {
  background: var(--ctrl-secondary-hover);
  border-color: var(--ctrl-secondary-border-hover);
  color: var(--text-primary);
}

/* ========== BOTTOM BAR ========== */
#bottom-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  transition: opacity 0.5s ease;
  text-shadow: var(--ui-text-shadow);
}

#scene-selector {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  justify-content: center;
}

.scene-btn {
  padding: 0.45rem 0.9rem;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--glass-chip-text);
  background: linear-gradient(180deg, var(--glass-chip-top) 0%, var(--glass-chip-bottom) 100%);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  transition: all var(--transition);
  white-space: nowrap;
}

.scene-btn:hover {
  background: linear-gradient(180deg, var(--glass-chip-top-hover) 0%, var(--glass-chip-bottom-hover) 100%);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
}

.scene-btn.active:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.scene-btn.active {
  background: var(--glass-bg);
  color: var(--text-primary);
  font-weight: 600;
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
}

/* ========== PANELS ========== */
.panel {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  width: min(420px, 95vw);
  max-height: 70vh;
  overflow-y: auto;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 1.2rem 1.5rem 2rem;
  box-shadow: var(--shadow);
  z-index: 10;
  transition: transform 0.35s ease, opacity 0.35s ease;
}

.panel.hidden {
  transform: translateX(-50%) translateY(100%);
  opacity: 0;
  pointer-events: none;
}

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

.panel-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mini-btn {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: rgba(245, 230, 211, 0.92);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.22), var(--glass-highlight);
}

.mini-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.26);
}

.audio-status {
  margin: -0.2rem 0 0.8rem;
  font-size: 0.8rem;
  color: rgba(245, 230, 211, 0.78);
  line-height: 1.35;
}

.panel-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.panel-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 1.3rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.panel-close:hover {
  background: var(--btn-hover);
  color: var(--text-primary);
}

/* ========== SOUND MIXER ========== */
.sound-channel {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
}

.sound-label {
  width: 60px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.sound-slider {
  flex: 1;
}

.sound-value {
  width: 40px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: right;
  font-family: var(--font-mono);
}

/* ========== SETTINGS ========== */
.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem 1rem;
  align-items: center;
}

.settings-grid label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.range-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.range-val {
  width: 28px;
  font-size: 0.85rem;
  color: var(--accent);
  font-family: var(--font-mono);
  text-align: right;
}

/* ========== STATS ========== */
.stats-row {
  display: flex;
  justify-content: space-around;
  padding: 0.5rem 0;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

#stats-chart {
  width: 100%;
  height: 160px;
  margin: 0.5rem 0;
}

/* ========== FOCUS MODE ========== */
body.focus-mode #top-bar,
body.focus-mode #bottom-bar {
  opacity: 0;
  pointer-events: none;
}

body.focus-mode:hover #top-bar,
body.focus-mode:hover #bottom-bar,
body.focus-mode #top-bar:focus-within,
body.focus-mode #bottom-bar:focus-within {
  opacity: 1;
  pointer-events: auto;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 500px) {
  #app {
    padding: 0.8rem 0.5rem;
  }

  #app-title {
    font-size: 0.95rem;
  }

  .ctrl-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
  }

  .scene-btn {
    padding: 0.35rem 0.7rem;
    font-size: 0.75rem;
  }

  .settings-grid {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .range-row {
    margin-bottom: 0.4rem;
  }
}

/* ========== SCROLLBAR ========== */
.panel::-webkit-scrollbar {
  width: 4px;
}

.panel::-webkit-scrollbar-track {
  background: transparent;
}

.panel::-webkit-scrollbar-thumb {
  background: var(--btn-bg);
  border-radius: 2px;
}