:root {
  --bg-app: #10131a;
  --bg-panel: #1a1f2b;
  --bg-panel-alt: #212736;
  --border: #2c3245;
  --text: #eef1f7;
  --text-muted: #9aa3b8;
  --accent: #3aa5ff;
  --accent-hover: #5cb6ff;
  --danger: #ff5470;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--bg-app);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app {
  min-height: 100vh;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

/* ---------- Setup view ---------- */

.view-setup.active {
  padding: 32px 20px 64px;
  max-width: 1200px;
  margin: 0 auto;
}

.app-header {
  text-align: center;
  margin-bottom: 32px;
}

.app-header h1 {
  font-size: 28px;
  margin: 0 0 8px;
}

.subtitle {
  color: var(--text-muted);
  margin: 0;
  font-size: 15px;
}

.setup-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr);
  gap: 24px;
  align-items: start;
}

@media (max-width: 860px) {
  .setup-layout {
    grid-template-columns: 1fr;
  }
}

.settings-panel,
.preview-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.preset-btn {
  background: var(--bg-panel-alt);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 12px 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: border-color 0.15s, transform 0.1s;
}

.preset-btn small {
  color: var(--text-muted);
  font-weight: 400;
}

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

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

.preset-btn.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.settings-form {
  display: grid;
  gap: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--text-muted);
}

.field input[type="text"],
.field input[type="number"],
.field select {
  background: var(--bg-panel-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 15px;
}

.field input[type="text"]:focus,
.field input[type="number"]:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
}

.field input[type="range"] {
  accent-color: var(--accent);
}

.field input[type="color"] {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-panel-alt);
  padding: 4px;
  cursor: pointer;
}

.field-checkbox {
  flex-direction: row;
  align-items: center;
  gap: 10px;
}

.field-checkbox input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.gear-btn {
  width: 100%;
  margin-top: 18px;
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  font-size: 14px;
}

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

.advanced-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.advanced-panel.hidden {
  display: none;
}

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

.field-warning {
  margin: -6px 0 4px;
  padding: 8px 10px;
  background: rgba(255, 84, 112, 0.12);
  border: 1px solid var(--danger);
  border-radius: 8px;
  color: var(--danger);
  font-size: 13px;
}

.field-warning.hidden {
  display: none;
}

@media (max-width: 500px) {
  .advanced-panel {
    grid-template-columns: 1fr;
  }
}

.settings-actions {
  margin-top: 20px;
  display: flex;
  justify-content: flex-end;
}

.btn-primary,
.btn-secondary {
  border: none;
  border-radius: 10px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
}

.btn-primary {
  background: var(--accent);
  color: #06121f;
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-panel-alt);
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-primary:active,
.btn-secondary:active {
  transform: scale(0.98);
}

.preview-label {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preview-frame {
  --timer-bg: #000000;
  --timer-color: #ffffff;
  --timer-warn-color: #ffb300;
  --timer-critical-color: #ff3b3b;
  --timer-font-size: 40vh;
  --timer-font-family: 'Segoe UI', system-ui, sans-serif;

  background: var(--timer-bg);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.preview-clock,
.timer-clock {
  font-family: var(--timer-font-family);
  color: var(--timer-color);
  font-size: calc(var(--timer-font-size) * 0.35);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  transition: color 0.2s ease, opacity 0.15s linear;
}

.preview-status,
.timer-status {
  font-family: var(--timer-font-family);
  color: var(--timer-color);
  opacity: 0.75;
  font-size: 16px;
  margin-top: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.preview-frame.warn .preview-clock,
.timer-display.warn .timer-clock {
  color: var(--timer-warn-color);
}

.preview-frame.critical .preview-clock,
.timer-display.critical .timer-clock {
  color: var(--timer-critical-color);
  animation: pulse 0.6s ease-in-out infinite;
}

.timer-display.hold-critical .timer-clock {
  color: var(--timer-critical-color);
}

.timer-display.transition .timer-clock {
  color: rgba(255, 235, 59, 0.5);
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.03); }
}

.preview-demo-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-muted);
}

.chip {
  background: var(--bg-panel-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
}

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

.preview-actions {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.preview-actions button {
  flex: 1;
  min-width: 160px;
}

/* ---------- Timer (fullscreen) view ---------- */

.view-timer.active {
  position: fixed;
  inset: 0;
  background: var(--timer-bg, #000000);
}

.timer-display {
  --timer-bg: #000000;
  --timer-color: #ffffff;
  --timer-warn-color: #ffb300;
  --timer-critical-color: #ff3b3b;
  --timer-font-size: 40vh;
  --timer-font-family: 'Segoe UI', system-ui, sans-serif;

  height: 100vh;
  width: 100vw;
  background: var(--timer-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: default;
}

.timer-display .timer-clock {
  font-size: var(--timer-font-size);
}

.control-menu {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 20px calc(20px + env(safe-area-inset-bottom));
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0));
  transform: translateY(100%);
  transition: transform 0.3s ease;
  z-index: 10;
}

.control-menu.visible {
  transform: translateY(0);
}

.control-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  border-radius: 10px;
  padding: 14px 22px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(6px);
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

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

@media (max-width: 600px) {
  .control-btn {
    padding: 12px 16px;
    font-size: 13px;
  }
}