:root {
  --bg: #f5f6fb;
  --surface: #ffffff;
  --surface-soft: #f0efff;
  --text: #18182a;
  --muted: #717287;
  --primary: #6d5dfc;
  --primary-dark: #5545e8;
  --primary-soft: #ece9ff;
  --success: #22a873;
  --warning: #f59e0b;
  --danger: #dc4c64;
  --border: #e5e5ef;
  --shadow: 0 20px 60px rgba(41, 38, 89, .10);
  --radius: 24px;
  --transition: .25s ease;
}

[data-theme="dark"] {
  --bg: #101018;
  --surface: #181823;
  --surface-soft: #242337;
  --text: #f5f4ff;
  --muted: #a9a8ba;
  --primary: #8b7cff;
  --primary-dark: #a196ff;
  --primary-soft: #2b2945;
  --border: #2d2d3d;
  --shadow: 0 20px 60px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 5%, rgba(109,93,252,.12), transparent 24rem),
    radial-gradient(circle at 90% 20%, rgba(34,168,115,.08), transparent 22rem),
    var(--bg);
  transition: background var(--transition), color var(--transition);
}
button, input, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid rgba(109, 93, 252, .25); outline-offset: 2px; }
.app-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.topbar { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; }
.brand-icon { width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; color: white; font-size: 26px; background: linear-gradient(135deg, var(--primary), #9d7cff); box-shadow: 0 10px 24px rgba(109,93,252,.3); }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1.05rem; }
.brand small { color: var(--muted); margin-top: 2px; }
.top-actions { display: flex; gap: 10px; }
.icon-button { width: 44px; height: 44px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); color: var(--text); display: grid; place-items: center; transition: var(--transition); }
.icon-button:hover { transform: translateY(-2px); border-color: var(--primary); }
.hero { min-height: 680px; display: grid; grid-template-columns: 1fr 500px; align-items: center; gap: 72px; padding: 54px 0 86px; }
.hero-copy h1 { margin: 12px 0 24px; font-size: clamp(2.5rem, 6vw, 5rem); line-height: .98; letter-spacing: -.06em; }
.hero-copy h1 span { color: var(--primary); }
.hero-copy > p:last-child { color: var(--muted); max-width: 560px; font-size: 1.08rem; line-height: 1.8; }
.eyebrow, .panel-kicker { margin: 0; color: var(--primary); font-weight: 800; font-size: .75rem; letter-spacing: .16em; }
.timer-card { background: var(--surface); border: 1px solid var(--border); border-radius: 32px; padding: 24px; box-shadow: var(--shadow); }
.mode-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; padding: 6px; border-radius: 16px; background: var(--surface-soft); }
.mode-tab { border: 0; border-radius: 12px; padding: 12px 10px; color: var(--muted); background: transparent; font-weight: 700; transition: var(--transition); }
.mode-tab.active { color: var(--primary); background: var(--surface); box-shadow: 0 8px 20px rgba(41,38,89,.08); }
.timer-progress { position: relative; width: 280px; height: 280px; margin: 28px auto 20px; display: grid; place-items: center; }
.timer-progress svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.timer-progress circle { fill: none; stroke-width: 9; }
.progress-track { stroke: var(--surface-soft); }
.progress-value { stroke: var(--primary); stroke-linecap: round; stroke-dasharray: 659.73; stroke-dashoffset: 0; transition: stroke-dashoffset .35s linear; }
.timer-display { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.timer-label, #sessionStatus { color: var(--muted); }
.timer-display strong { font-size: 4.1rem; line-height: 1; letter-spacing: -.06em; margin: 8px 0; font-variant-numeric: tabular-nums; }
.timer-actions { display: grid; grid-template-columns: 1fr 1.4fr 1fr; gap: 10px; }
.primary-button, .secondary-button { border: 0; border-radius: 14px; padding: 14px 18px; font-weight: 800; transition: var(--transition); }
.primary-button { color: white; background: linear-gradient(135deg, var(--primary), #826dfc); box-shadow: 0 12px 24px rgba(109,93,252,.25); }
.primary-button:hover { transform: translateY(-2px); background: var(--primary-dark); }
.secondary-button { color: var(--text); background: var(--surface-soft); }
.secondary-button:hover { color: var(--primary); }
.cycle-info { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; }
.cycle-info span, .cycle-info strong { display: block; }
.cycle-info > div:first-child span { color: var(--muted); font-size: .8rem; }
.cycle-dots { display: flex; justify-content: center; gap: 7px; }
.cycle-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--border); }
.cycle-dot.active { background: var(--primary); transform: scale(1.15); }
.switch-row, .setting-toggle { display: flex; align-items: center; gap: 10px; }
.switch-row { font-size: .8rem; color: var(--muted); }
.switch-row input, .setting-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.switch { width: 42px; height: 24px; padding: 3px; border-radius: 999px; background: var(--border); transition: var(--transition); }
.switch::after { content: ""; display: block; width: 18px; height: 18px; border-radius: 50%; background: white; box-shadow: 0 2px 6px rgba(0,0,0,.16); transition: var(--transition); }
input:checked + .switch { background: var(--primary); }
input:checked + .switch::after { transform: translateX(18px); }
.dashboard, .history-section { padding: 32px 0 86px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
.section-heading h2 { margin: 8px 0 0; font-size: 2rem; }
.text-button { border: 0; color: var(--danger); background: transparent; font-weight: 700; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat-card, .panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 12px 34px rgba(41,38,89,.06); }
.stat-card { display: flex; align-items: center; gap: 14px; padding: 22px; }
.stat-icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; background: var(--primary-soft); }
.stat-card span:not(.stat-icon) { color: var(--muted); font-size: .85rem; }
.stat-card strong { display: block; margin-top: 5px; font-size: 1.35rem; }
.analytics-grid { display: grid; grid-template-columns: 1.6fr .9fr; gap: 18px; margin-top: 18px; }
.panel { padding: 24px; }
.panel-header { display: flex; align-items: start; justify-content: space-between; gap: 16px; }
.panel-header h3 { margin: 6px 0 0; }
.bar-chart { height: 240px; margin-top: 28px; display: grid; grid-template-columns: repeat(7, 1fr); align-items: end; gap: 14px; }
.bar-column { min-width: 0; height: 100%; display: flex; flex-direction: column; justify-content: end; align-items: center; gap: 8px; }
.bar-value { color: var(--muted); font-size: .72rem; }
.bar-track { width: min(38px, 70%); height: 170px; display: flex; align-items: end; border-radius: 12px; background: var(--surface-soft); overflow: hidden; }
.bar-fill { width: 100%; min-height: 4px; border-radius: 12px; background: linear-gradient(180deg, #9a8bff, var(--primary)); transition: height .5s ease; }
.bar-label { color: var(--muted); font-size: .78rem; text-transform: capitalize; }
.goal-panel { text-align: center; }
.goal-panel .panel-header { text-align: left; }
.goal-ring { --goal-progress: 0deg; width: 176px; height: 176px; margin: 28px auto 18px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--primary) var(--goal-progress), var(--surface-soft) 0); position: relative; }
.goal-ring::after { content: ""; position: absolute; inset: 14px; border-radius: 50%; background: var(--surface); }
.goal-ring > div { position: relative; z-index: 1; }
.goal-ring strong { display: block; font-size: 2.5rem; }
.goal-ring span { color: var(--muted); }
.goal-panel p { color: var(--muted); line-height: 1.6; }
.history-section select { border: 1px solid var(--border); border-radius: 12px; padding: 10px 14px; color: var(--text); background: var(--surface); }
.history-list { display: grid; gap: 12px; }
.history-item { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 16px; padding: 18px 20px; border: 1px solid var(--border); border-radius: 18px; background: var(--surface); }
.history-type { width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; background: var(--primary-soft); }
.history-item h3 { margin: 0 0 4px; font-size: 1rem; }
.history-item p, .history-item time { margin: 0; color: var(--muted); font-size: .85rem; }
.history-duration { text-align: right; }
.history-duration strong { display: block; }
.empty-state { text-align: center; padding: 64px 20px; border: 1px dashed var(--border); border-radius: var(--radius); background: rgba(255,255,255,.25); }
.empty-state span { font-size: 2.4rem; }
.empty-state h3 { margin-bottom: 8px; }
.empty-state p { color: var(--muted); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0 36px; border-top: 1px solid var(--border); }
.footer-author { display: grid; gap: 5px; }
.footer-author strong { color: var(--text); font-family: "Montserrat", "Segoe UI", sans-serif; font-size: .92rem; font-weight: 600; }
.footer-author span { color: var(--muted); font-size: .78rem; }
.footer-links { display: flex; align-items: center; gap: 10px; }
.footer-links a { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 9px 14px; border: 1px solid var(--border); border-radius: 12px; color: var(--text); background: var(--surface); font-size: .82rem; font-weight: 700; text-decoration: none; transition: var(--transition); }
.footer-links a:hover { color: white; border-color: var(--primary); background: var(--primary); transform: translateY(-1px); }
.footer-links a:focus-visible { outline: 3px solid var(--primary-soft); outline-offset: 2px; }
.modal-backdrop { position: fixed; inset: 0; z-index: 50; padding: 20px; display: grid; place-items: center; background: rgba(10,10,20,.58); backdrop-filter: blur(6px); }
.modal-backdrop[hidden] { display: none; }
.modal { width: min(620px, 100%); max-height: calc(100vh - 40px); overflow-y: auto; border: 1px solid var(--border); border-radius: 26px; padding: 26px; background: var(--surface); box-shadow: var(--shadow); }
.modal-header { display: flex; align-items: start; justify-content: space-between; gap: 18px; margin-bottom: 20px; }
.modal-header h2 { margin: 6px 0 0; }
fieldset { margin: 0 0 18px; padding: 18px; border: 1px solid var(--border); border-radius: 18px; }
legend { padding: 0 8px; font-weight: 800; }
.form-grid { display: grid; gap: 14px; }
.three-columns { grid-template-columns: repeat(3, 1fr); }
.two-columns { grid-template-columns: repeat(2, 1fr); }
.form-grid label { color: var(--muted); font-size: .85rem; }
.form-grid input { width: 100%; margin-top: 7px; padding: 12px; border: 1px solid var(--border); border-radius: 12px; color: var(--text); background: var(--bg); }
.setting-toggle { justify-content: space-between; padding: 12px 0; }
.setting-toggle + .setting-toggle { border-top: 1px solid var(--border); }
.setting-toggle span:first-child { flex: 1; }
.setting-toggle strong, .setting-toggle small { display: block; }
.setting-toggle small { margin-top: 4px; color: var(--muted); }
.modal-actions { display: flex; justify-content: space-between; gap: 12px; }
.toast-container { position: fixed; right: 20px; bottom: 20px; z-index: 80; display: grid; gap: 10px; }
.toast { max-width: 340px; padding: 14px 16px; border-radius: 14px; color: white; background: #25243a; box-shadow: var(--shadow); animation: toastIn .25s ease; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } }
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 40px; }
  .hero-copy { text-align: center; }
  .hero-copy > p:last-child { margin-inline: auto; }
  .timer-card { width: min(520px, 100%); margin: 0 auto; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .app-shell { width: min(100% - 20px, 1180px); }
  .topbar { min-height: 74px; }
  .brand small { display: none; }
  .hero { min-height: auto; padding: 38px 0 64px; }
  .hero-copy h1 { font-size: clamp(2.4rem, 13vw, 4rem); }
  .timer-card { padding: 16px; border-radius: 24px; }
  .timer-progress { width: 240px; height: 240px; }
  .timer-display strong { font-size: 3.4rem; }
  .timer-actions { grid-template-columns: 1fr 1fr; }
  #startPauseButton { grid-column: 1 / -1; grid-row: 1; }
  .cycle-info { grid-template-columns: 1fr auto; }
  .cycle-dots { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; }
  .stats-grid, .analytics-grid { grid-template-columns: 1fr; }
  .section-heading { align-items: start; flex-direction: column; }
  .bar-chart { gap: 7px; }
  .three-columns, .two-columns { grid-template-columns: 1fr; }
  .modal-actions { flex-direction: column-reverse; }
  .site-footer { flex-direction: column; align-items: flex-start; }
  .footer-links { width: 100%; }
  .footer-links a { flex: 1; }
}
@media (max-width: 440px) {
  .top-actions { gap: 6px; }
  .icon-button { width: 40px; height: 40px; }
  .mode-tab { font-size: .78rem; }
  .timer-progress { width: 216px; height: 216px; }
  .timer-display strong { font-size: 3rem; }
  .history-item { grid-template-columns: auto 1fr; }
  .history-duration { grid-column: 2; text-align: left; }
}