/* === Variables === */
:root {
  --primary: #0b1f3a;
  --primary-light: #16345f;
  --background: #ffffff;
  --surface: #f8f9fa;
  --text: #111111;
  --muted: #6c757d;
  --border: #e5e7eb;
  --shadow: rgba(0,0,0,0.05);
}

[data-theme="dark"] {
  --background: #081120;
  --surface: #0f1c2e;
  --text: #ffffff;
  --muted: #b0b7c3;
  --border: rgba(255,255,255,0.08);
  --shadow: rgba(0,0,0,0.3);
}

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--background);
  margin: 0;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* === Layout === */
.container-xl {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Navbar === */
.navbar {
  height: 60px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.navbar .container-xl {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.navbar-brand { text-decoration: none; }

.brand-text { font-weight: 700; color: var(--primary); }
[data-theme="dark"] .brand-text { color: #ffffff; }

.brand-dot { color: var(--primary); font-weight: 700; }
[data-theme="dark"] .brand-dot { color: #ffffff; }

.brand-tools { font-weight: 400; color: var(--muted); }

.nav-right { display: flex; align-items: center; gap: 16px; }

.nav-back {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-back:hover { color: var(--primary); }
[data-theme="dark"] .nav-back:hover { color: #ffffff; }

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 14px;
  transition: border-color 0.2s;
}
.theme-toggle:hover { border-color: var(--primary); }

/* === Tool Header === */
.tool-header { padding: 40px 0 24px; }

.tool-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
  line-height: 1.2;
}
[data-theme="dark"] .tool-title { color: #ffffff; }

.tool-description {
  font-size: 15px;
  color: var(--muted);
  margin-top: 6px;
  margin-bottom: 0;
}

/* === Tool Main === */
.tool-main { padding: 0 0 80px; }

/* === Tool Card === */
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 2px 8px var(--shadow);
  max-width: 520px;
  margin: 0 auto;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

/* === Timer Block === */
.timer-block {
  text-align: center;
  padding: 32px 0 28px;
}

.session-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.timer-display {
  font-size: 64px;
  font-weight: 700;
  font-family: 'Courier New', Courier, monospace;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 20px;
}
[data-theme="dark"] .timer-display { color: #ffffff; }

.pomodoro-dots {
  font-size: 18px;
  letter-spacing: 8px;
  color: var(--primary);
  min-height: 28px;
}
[data-theme="dark"] .pomodoro-dots { color: #ffffff; }

/* === Controls === */
.btn-group-timer {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.btn {
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: none;
  min-height: 44px;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s, opacity 0.2s;
}

.btn-primary-ct {
  background-color: var(--primary);
  color: #ffffff;
  border: 1px solid var(--primary);
}
.btn-primary-ct:hover:not(:disabled) {
  background-color: var(--primary-light);
  border-color: var(--primary-light);
}

.btn-secondary-ct {
  background-color: var(--background);
  color: var(--primary);
  border: 1px solid var(--border);
}
[data-theme="dark"] .btn-secondary-ct { color: #ffffff; }
.btn-secondary-ct:hover:not(:disabled) {
  background-color: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* === Settings Toggle === */
.settings-row {
  text-align: center;
  margin-bottom: 16px;
}

.settings-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
  transition: color 0.2s, border-color 0.2s;
}
.settings-btn:hover { color: var(--primary); border-color: var(--primary); }
[data-theme="dark"] .settings-btn:hover { color: #ffffff; border-color: var(--muted); }

/* === Settings Panel === */
.settings-panel {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  margin-top: 4px;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 12px;
}

.setting-field { display: flex; flex-direction: column; }

.setting-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.setting-input {
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  width: 100%;
  transition: border-color 0.2s;
}
.setting-input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  border-color: var(--primary);
}

.settings-note {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}

/* === Footer === */
.site-footer { padding: 24px 0; border-top: 1px solid var(--border); }

.footer-text {
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  margin: 0;
}

.footer-text a { color: var(--primary); text-decoration: none; }
[data-theme="dark"] .footer-text a { color: #ffffff; }
.footer-text a:hover { text-decoration: underline; }

/* === Responsive === */
@media (max-width: 575px) {
  .tool-card { padding: 16px; }
  .tool-title { font-size: 22px; }
  .timer-display { font-size: 52px; }
  .btn { flex: 1 1 80px; padding: 10px 12px; }
  .settings-grid { grid-template-columns: 1fr; }
}