/* =========================
   Global variables & reset
   ========================= */

:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-surface-alt: #f8f9ff;
  --color-border: #e1e8ef;
  --color-primary: #007bff;
  --color-primary-dark: #0056b3;
  --color-accent: #0ea5e9;
  --color-text: #333333;
  --color-text-soft: #666666;
  --color-muted: #9ca3af;
  --color-danger: #dc2626;

  --radius-card: 12px;
  --radius-pill: 999px;

  --shadow-soft: 0 4px 6px rgba(0, 0, 0, 0.08);

  --transition-fast: 0.15s ease-in-out;
}

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

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* Dark mode overrides */
body.dark-mode {
  --color-bg: #020617;
  --color-surface: #0b1120;
  --color-surface-alt: #020617;
  --color-border: #1f2937;
  --color-primary: #38bdf8;
  --color-primary-dark: #0284c7;
  --color-text: #e5e7eb;
  --color-text-soft: #9ca3af;
  --color-muted: #6b7280;
  --shadow-soft: 0 6px 16px rgba(0, 0, 0, 0.7);
}

/* =========================
   Layout
   ========================= */

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem 2.5rem;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
  padding: 1.5rem 1.25rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
}

/* =========================
   Header & nav
   ========================= */

.site-header {
  background: var(--color-primary);
  color: #ffffff;
  padding: 1.5rem 1rem 1rem;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
}

.site-header h1 {
  margin: 0 0 0.3rem;
  font-size: 1.9rem;
}

.site-header .intro {
  margin: 0;
  font-size: 0.98rem;
  opacity: 0.95;
}

.theme-toggle {
  align-self: center;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.8);
  background: rgba(0, 0, 0, 0.12);
  color: #ffffff;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-toggle:hover {
  background: rgba(0, 0, 0, 0.25);
}

.main-nav {
  max-width: 1200px;
  margin: 0.5rem auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0 1rem 1rem;
}

.main-nav a {
  color: #e0f2ff;
  text-decoration: none;
  font-size: 0.92rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.main-nav a:hover {
  background: rgba(255, 255, 255, 0.16);
}

/* =========================
   Typography & utilities
   ========================= */

.section-title {
  text-align: center;
  margin: 0 0 1rem;
  font-size: 1.6rem;
  color: var(--color-primary);
  position: relative;
}

.section-title::after {
  content: "";
  position: absolute;
  width: 70px;
  height: 3px;
  background: var(--color-primary);
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  margin: 0.75rem auto 1.25rem;
  max-width: 720px;
  color: var(--color-text-soft);
  font-size: 0.95rem;
}

.help-text {
  font-size: 0.85rem;
  color: var(--color-text-soft);
}

.status-message {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

/* Buttons */

.btn-primary,
.btn-secondary,
.btn-outline,
.btn-chip,
.btn-link {
  font-family: inherit;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0.6rem 1rem;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #6c757d;
  color: #ffffff;
}

body.dark-mode .btn-secondary {
  background: #4b5563;
}

.btn-secondary:hover:not(:disabled) {
  background: #545b62;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-chip {
  background: var(--color-surface-alt);
  border-radius: var(--radius-pill);
  padding-inline: 0.9rem;
  border: 1px solid var(--color-border);
  font-size: 0.84rem;
  color: var(--color-text-soft);
}

.btn-chip:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.btn-link {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  color: var(--color-primary);
  text-decoration: underline;
  margin-top: 0.5rem;
  justify-content: flex-start;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* =========================
   Stopwatch layout
   ========================= */

.stopwatch-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 1.25rem;
  align-items: flex-start;
}

.stopwatch-left,
.stopwatch-right {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

/* Displays */

.display-card,
.controls-card,
.export-card,
.laps-card,
.analog-card {
  background: var(--color-surface-alt);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  padding: 1rem;
}

.display-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-soft);
  margin-bottom: 0.25rem;
}

.digital-time {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.07em;
}

/* Analog display */

.analog-clock {
  display: flex;
  justify-content: center;
  margin-top: 0.25rem;
}

.analog-face {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 3px solid var(--color-border);
  position: relative;
  background: var(--color-surface);
}

.hand {
  position: absolute;
  width: 2px;
  height: 45%;
  background: var(--color-primary);
  top: 10%;
  left: 50%;
  transform-origin: bottom center;
  transform: translateX(-50%) rotate(0deg);
}

.analog-help {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
}

/* Controls & export */

.controls-row,
.export-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.export-row.secondary {
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

/* Laps table */

.laps-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.laps-header h3 {
  margin: 0;
  font-size: 1rem;
}

.laps-hint {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.laps-table-wrapper {
  max-height: 280px;
  overflow-y: auto;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.laps-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.laps-table thead {
  position: sticky;
  top: 0;
  background: var(--color-surface-alt);
  z-index: 1;
}

.laps-table th,
.laps-table td {
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.laps-table th {
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--color-text-soft);
}

.laps-table th:hover {
  color: var(--color-primary-dark);
}

.laps-table tr:last-child td {
  border-bottom: none;
}

/* Lap highlights */

.lap-fastest {
  background: rgba(34, 197, 94, 0.12);
}

.lap-slowest {
  background: rgba(248, 113, 113, 0.12);
}

body.dark-mode .lap-fastest {
  background: rgba(22, 163, 74, 0.35);
}

body.dark-mode .lap-slowest {
  background: rgba(220, 38, 38, 0.35);
}

/* Note box */

.note-box {
  text-align: center;
  padding: 0.9rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--color-primary);
  background: #e9f5ff;
  color: var(--color-primary-dark);
  font-size: 0.9rem;
}

body.dark-mode .note-box {
  background: #020617;
  border-color: var(--color-primary);
  color: #e0f2fe;
}

/* =========================
   Benefits
   ========================= */

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.benefit {
  background: var(--color-surface-alt);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  padding: 1rem;
}

.benefit-icon {
  font-size: 1.5rem;
  margin-bottom: 0.4rem;
}

/* =========================
   Steps
   ========================= */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.step {
  background: var(--color-surface-alt);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  padding: 1rem;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

/* =========================
   FAQ
   ========================= */

.faq-item {
  margin-bottom: 0.75rem;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 0.8rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--color-primary-dark);
}

.faq-answer {
  display: none;
  padding: 0.75rem 0.9rem;
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
  border-radius: 0 0 8px 8px;
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.92rem;
}

.faq-item.active .faq-answer {
  display: block;
}

/* =========================
   Footer
   ========================= */

.site-footer {
  background: #f1f1f1;
  color: var(--color-text-soft);
  text-align: center;
  padding: 1.5rem 1rem 2rem;
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--color-primary);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

body.dark-mode .site-footer {
  background: #020617;
}

/* =========================
   Responsive
   ========================= */

@media (max-width: 900px) {
  .stopwatch-layout {
    grid-template-columns: 1fr;
  }

  .header-inner {
    flex-direction: column;
  }

  .theme-toggle {
    align-self: flex-start;
  }
}

@media (max-width: 600px) {
  .card {
    padding: 1.25rem 1rem;
  }

  .site-header h1 {
    font-size: 1.6rem;
  }

  .digital-time {
    font-size: 2.1rem;
  }

  .controls-row,
  .export-row {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary,
  .btn-outline {
    width: 100%;
  }

  .lapses-table-wrapper {
    max-height: 240px;
  }
}