/* ─── Google Fonts ─────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=DM+Sans:opsz,wght@9..40,300;400;500;600&display=swap');

/* ─── CSS Variables ─────────────────────────────────── */
:root {
  --md-primary: #1a73e8;
  --md-primary-container: #d3e3fd;
  --md-on-primary: #ffffff;
  --md-secondary: #00bcd4;
  --md-accent: #f59e0b;
  --md-error: #ef4444;
  --md-success: #22c55e;

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 50px;

  --font-display: 'Space Mono', monospace;
  --font-ui: 'DM Sans', sans-serif;

  --shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  --shadow-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}

/* ─── Dark Mode (default) ──────────────────────────── */
[data-theme="dark"] {
  --bg-base:      #0d1117;
  --bg-surface:   #161b22;
  --bg-elevated:  #21262d;
  --bg-overlay:   #30363d;
  --text-primary: #e6edf3;
  --text-secondary:#8b949e;
  --text-muted:   #484f58;
  --border:       #30363d;
  --divider:      #21262d;
  --timer-glow:   rgba(26, 115, 232, 0.3);
  --ad-bg:        #1a1f26;
  --ad-border:    #2d333b;
}

/* ─── Light Mode ───────────────────────────────────── */
[data-theme="light"] {
  --bg-base:      #f8f9fa;
  --bg-surface:   #ffffff;
  --bg-elevated:  #f1f3f4;
  --bg-overlay:   #e8eaed;
  --text-primary: #202124;
  --text-secondary:#5f6368;
  --text-muted:   #9aa0a6;
  --border:       #dadce0;
  --divider:      #f1f3f4;
  --timer-glow:   rgba(26, 115, 232, 0.15);
  --ad-bg:        #fafafa;
  --ad-border:    #e0e0e0;

  --shadow-1: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.12);
  --shadow-2: 0 3px 6px rgba(0,0,0,0.10), 0 3px 6px rgba(0,0,0,0.12);
  --shadow-3: 0 10px 20px rgba(0,0,0,0.10), 0 6px 6px rgba(0,0,0,0.12);
}

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

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

body {
  font-family: var(--font-ui);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* ─── App Shell ────────────────────────────────────── */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ─── Header ───────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0 8px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-base);
  z-index: 100;
  transition: background var(--transition);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.app-logo svg {
  width: 28px;
  height: 28px;
}

.app-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--md-primary);
  letter-spacing: -0.5px;
}

.app-title span {
  color: var(--text-secondary);
  font-weight: 400;
}

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

/* ─── Icon Button ──────────────────────────────────── */
.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
}

.icon-btn:hover { background: var(--bg-elevated); color: var(--text-primary); }
.icon-btn:active { background: var(--bg-overlay); }
.icon-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: currentColor;
  opacity: 0;
  transform: scale(0);
  transition: transform 0.3s, opacity 0.3s;
}
.icon-btn:active::after { transform: scale(1); opacity: 0.12; }

/* ─── Ad Banner (removed - using AdSense auto-ads) ─── */

/* ─── Main Content ─────────────────────────────────── */
.main-content {
  flex: 1;
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ─── Panel System (nested card architecture) ──────── */

/* Outer panel — outermost card */
.panel {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2);
  overflow: hidden;
  transition: background var(--transition), border-color var(--transition);
}

/* Display area — inset block at top of panel */
.panel-display {
  padding: 28px 24px 20px;
  text-align: center;
  border-bottom: 1px solid var(--divider);
}

/* Progress nested inside display */
.panel-progress {
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: 10px 12px 8px;
  margin-top: 14px;
  border: 1px solid var(--border);
}

/* Settings sub-panel — inset background */
.panel-settings {
  background: var(--bg-elevated);
  margin: 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 12px 14px 14px;
}

.panel-settings-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
  padding-left: 2px;
}

/* Controls area — bottom of panel */
.panel-controls {
  padding: 16px 20px 18px;
  border-top: 1px solid var(--divider);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.shortcut-hint {
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Lap panel */
.panel-lap {
  overflow: visible;
}

.panel-lap-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 10px;
  border-bottom: 1px solid var(--divider);
}

/* Inset lap list */
.lap-list-inset {
  background: var(--bg-elevated);
  margin: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
}

/* ─── Timer Display ────────────────────────────────── */
.timer-display {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 12vw, 4.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 4px;
  transition: color var(--transition), text-shadow var(--transition);
  text-shadow: 0 0 40px var(--timer-glow);
  user-select: none;
}

.timer-display.running {
  color: var(--md-primary);
  text-shadow: 0 0 40px rgba(26, 115, 232, 0.5), 0 0 80px rgba(26, 115, 232, 0.2);
}

.timer-display.finished {
  color: var(--md-success);
  text-shadow: 0 0 40px rgba(34, 197, 94, 0.4);
}

.timer-ms {
  font-size: 0.45em;
  color: var(--text-secondary);
  vertical-align: baseline;
  margin-left: 2px;
}

.timer-status {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 500;
  height: 18px;
  margin-bottom: 16px;
}

/* ─── Progress Bar ─────────────────────────────────── */
.progress-container {
  background: var(--bg-elevated);
  border-radius: 999px;
  height: 6px;
  overflow: hidden;
  margin: 0 0 4px;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--md-primary), var(--md-secondary));
  border-radius: 999px;
  width: 0%;
  transition: width 0.1s linear;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-family: var(--font-display);
}

/* ─── Range Inputs ─────────────────────────────────── */
.range-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.input-label .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.dot-start { background: var(--md-success); }
.dot-stop  { background: var(--md-error); }

.time-input {
  font-family: var(--font-display);
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-primary);
  width: 100%;
  letter-spacing: 1px;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  outline: none;
}

.time-input:focus {
  border-color: var(--md-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
  background: var(--bg-surface);
}

.time-input::placeholder { color: var(--text-muted); }

.input-hint {
  font-size: 0.65rem;
  color: var(--text-muted);
  padding-left: 2px;
}

/* ─── Controls ─────────────────────────────────────── */
.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-pill);
  padding: 0 24px;
  height: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.3px;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity 0.2s;
}
.btn:active::after { opacity: 0.12; }

.btn-primary {
  background: var(--md-primary);
  color: #fff;
  box-shadow: var(--shadow-2);
  min-width: 130px;
  justify-content: center;
  font-size: 1rem;
}

.btn-primary:hover { filter: brightness(1.1); box-shadow: var(--shadow-3); }
.btn-primary.paused { background: var(--md-accent); }
.btn-primary.running { background: #e53e3e; }

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-overlay); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-elevated); color: var(--text-primary); }

.btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

.btn svg { flex-shrink: 0; }

/* ─── Lap List ─────────────────────────────────────── */
.lap-count {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-display);
}

.lap-list {
  max-height: 200px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.lap-list::-webkit-scrollbar { width: 4px; }
.lap-list::-webkit-scrollbar-track { background: transparent; }
.lap-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.lap-item {
  display: grid;
  grid-template-columns: 32px 1fr 1fr 1fr;
  gap: 8px;
  align-items: center;
  padding: 10px 16px;
  border-bottom: 1px solid var(--divider);
  font-family: var(--font-display);
  font-size: 0.82rem;
  animation: lapIn 0.2s ease;
  transition: background var(--transition);
}

.lap-item:last-child { border-bottom: none; }
.lap-item:hover { background: var(--bg-elevated); }

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

.lap-num {
  color: var(--text-muted);
  font-size: 0.72rem;
}

.lap-split { color: var(--text-primary); }
.lap-total { color: var(--text-secondary); }

.lap-delta { font-size: 0.75rem; }
.lap-delta.faster { color: var(--md-success); }
.lap-delta.slower { color: var(--md-error); }
.lap-delta.neutral { color: var(--text-muted); }

.lap-empty {
  padding: 24px 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ─── Noads Button ─────────────────────────────────── */
.noads-banner {
  background: linear-gradient(135deg, rgba(26,115,232,0.1), rgba(0,188,212,0.1));
  border: 1px solid rgba(26,115,232,0.25);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

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

.noads-text strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}

.btn-noads {
  background: var(--md-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  padding: 8px 20px;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.btn-noads:hover { filter: brightness(1.1); box-shadow: var(--shadow-2); }

/* ─── Footer ───────────────────────────────────────── */
.app-footer {
  padding: 16px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* ─── Install Prompt ───────────────────────────────── */
.install-prompt {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: slideDown 0.3s ease;
}

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

.install-text {
  flex: 1;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.install-text strong { color: var(--text-primary); font-size: 0.88rem; }

/* ─── Responsive ───────────────────────────────────── */
@media (max-width: 480px) {
  .range-inputs {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .panel-display { padding: 20px 16px 16px; }
  .panel-settings { margin: 8px; }
  .panel-controls { padding: 12px 14px 14px; }

  .controls { gap: 8px; }

  .btn-primary {
    min-width: 110px;
    font-size: 0.95rem;
  }

  .lap-item {
    grid-template-columns: 28px 1fr 1fr auto;
    font-size: 0.78rem;
    padding: 9px 12px;
  }

  .noads-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 600px) {
  .panel-display { padding: 36px 32px 24px; }
  .panel-settings { margin: 16px; }
  .panel-controls { padding: 20px 28px 22px; }
}

/* ─── Transitions for theme switch ────────────────────*/
* {
  transition: background-color var(--transition),
              border-color var(--transition),
              color var(--transition);
}
.timer-display, .progress-bar { transition: none; }
.timer-display { transition: color 0.3s, text-shadow 0.3s; }
.progress-bar  { transition: width 0.1s linear; }