/* ============================================================
   StopwatchHQ — v1 design system
   Mobile-first · dark default + light toggle · system fonts
   No frameworks, no web fonts, no build step.
   ============================================================ */

/* ---------- design tokens ---------- */
:root {
  --bg: #0f1115;
  --bg-elev: #161a21;
  --card: #1b202a;
  --text: #e9ecf2;
  --dim: #9aa3b2;
  --border: #272e3a;
  --accent: #2f6fe0;
  --accent-strong: #7db2ff;
  --accent-ink: #a9c9ff;
  --ok: #2fd48c;
  --warn: #ffb02e;
  --hot: #ff5f56;
  --flash-color: #ff5f56;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 62rem;
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f6f7fa;
  --bg-elev: #ffffff;
  --card: #ffffff;
  --text: #171b23;
  --dim: #5b6472;
  --border: #e2e6ee;
  --accent: #1a56db;
  --accent-strong: #1749b8;
  --accent-ink: #1a56db;
  --ok: #0e9f6e;
  --warn: #b97d0a;
  --hot: #d93836;
  --flash-color: #d93836;
  --shadow: 0 10px 26px rgba(23, 27, 35, 0.08);
  color-scheme: light;
}

/* ---------- reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--accent); color: #fff; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1rem, 4vw, 2rem); }
main { flex: 1; padding-block: clamp(1.25rem, 3vw, 2.25rem); }

/* ---------- header / nav ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-head .wrap { display: flex; align-items: center; gap: .75rem; min-height: 3.5rem; flex-wrap: wrap; padding-block: .35rem; }
.brand {
  font-weight: 800; font-size: 1.12rem; letter-spacing: -.02em;
  color: var(--text); display: inline-flex; align-items: center; gap: .5rem;
}
.brand:hover { text-decoration: none; }
.brand .logo { width: 1.5rem; height: 1.5rem; flex: none; }
.site-nav { display: flex; gap: .15rem; flex-wrap: wrap; margin-left: .25rem; }
.site-nav a {
  padding: .45rem .7rem; border-radius: var(--radius-sm);
  color: var(--dim); font-weight: 550; font-size: .95rem;
}
.site-nav a:hover { color: var(--text); background: var(--card); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--text); background: var(--card); }
.theme-toggle {
  margin-left: auto;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 999px; width: 2.6rem; height: 2.6rem; flex: none;
  display: grid; place-items: center; cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle svg { width: 1.15rem; height: 1.15rem; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }

/* ---------- hero (home) ---------- */
.hero { text-align: center; padding-block: clamp(2rem, 7vw, 4.5rem); }
.hero h1 {
  font-size: clamp(2rem, 6.5vw, 3.4rem); line-height: 1.08; letter-spacing: -.03em;
  font-weight: 850; max-width: 24ch; margin-inline: auto;
}
.hero p { color: var(--dim); max-width: 46ch; margin: 1rem auto 0; font-size: clamp(1rem, 2.5vw, 1.15rem); }
.hero .cta-row { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; margin-top: 1.75rem; }

/* ---------- tool cards ---------- */
.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); padding-block: 1rem 0; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.35rem 1.35rem 1.2rem;
  display: flex; flex-direction: column; gap: .5rem;
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.card h2 { font-size: 1.15rem; letter-spacing: -.01em; }
.card p { color: var(--dim); font-size: .95rem; flex: 1; }
.card .go { font-weight: 650; font-size: .95rem; }
.card .emoji { font-size: 1.7rem; line-height: 1; }

/* ---------- tool page layout ---------- */
.tool { max-width: 46rem; margin-inline: auto; text-align: center; }
.tool h1 { font-size: clamp(1.45rem, 4vw, 2rem); letter-spacing: -.02em; margin-bottom: .25rem; }
.tool .sub { color: var(--dim); font-size: .98rem; margin-bottom: 1.4rem; }

.display {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: clamp(3.2rem, 17vw, 8.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: .01em;
  padding: clamp(.6rem, 2vw, 1.2rem) 0 .2rem;
  color: var(--text);
  transition: color .25s ease;
  overflow-wrap: anywhere;
}
.display.running { color: var(--accent-ink); }
.display.done { color: var(--flash-color); }
.display.flash { animation: flashbg .3s steps(2, jump-none) infinite; }
@keyframes flashbg { 0% { background: transparent; } 50% { background: var(--flash-color); color: #fff; } 100% { background: transparent; } }

.status { min-height: 1.6em; color: var(--dim); font-weight: 600; }
.status.done { color: var(--flash-color); }

/* ---------- controls / buttons ---------- */
.controls { display: flex; flex-wrap: wrap; justify-content: center; gap: .7rem; margin-block: 1.1rem; }
.btn {
  min-height: 48px; padding: .55rem 1.25rem;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--card); color: var(--text);
  font-weight: 650; cursor: pointer; user-select: none;
  transition: transform .1s ease, border-color .15s ease, background .15s ease;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-ghost { background: transparent; }

/* ---------- presets row ---------- */
.presets { display: flex; flex-wrap: wrap; justify-content: center; gap: .55rem; margin-block: .4rem 1rem; }
.presets a, .presets button {
  display: inline-block; padding: .42rem .8rem; min-height: 40px;
  border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--text);
  font-size: .92rem; font-weight: 600; font-variant-numeric: tabular-nums;
  display: inline-flex; align-items: center;
}
.presets a:hover, .presets button:hover { border-color: var(--accent); text-decoration: none; }
.presets a.on { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- custom time input ---------- */
.custom-row { display: flex; gap: .6rem; justify-content: center; align-items: end; flex-wrap: wrap; margin-block: .2rem 1rem; }
.custom-row label { font-size: .85rem; color: var(--dim); display: block; text-align: left; }
.custom-row input {
  width: 5.2rem; padding: .5rem .6rem; font-size: 1.15rem; font-weight: 650;
  font-variant-numeric: tabular-nums; text-align: center;
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.custom-row input:focus { border-color: var(--accent); outline: none; }

/* ---------- laps ---------- */
.laps { list-style: none; padding: 0; margin: .8rem 0 0; text-align: left; max-height: 15rem; overflow-y: auto; }
.laps li {
  display: flex; justify-content: space-between; gap: 1rem; align-items: baseline;
  padding: .5rem .9rem; border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
  border-bottom: 1px solid var(--border);
  animation: lapin .25s ease;
}
@keyframes lapin { from { opacity: 0; transform: translateY(-4px); } }
.laps li:last-child { border-bottom: 0; }
.laps .lap-n { color: var(--dim); font-weight: 650; font-size: .9rem; flex: none; }
.laps .lap-t { font-weight: 700; }
.laps .lap-total { color: var(--dim); font-size: .9rem; flex: none; }
.laps li.best .lap-t { color: var(--ok); }
.laps li.worst .lap-t { color: var(--warn); }
.laps .empty { display: none; }

/* ---------- phase / meta rows ---------- */
.phase-row { display: flex; justify-content: center; gap: .75rem; flex-wrap: wrap; margin-bottom: .4rem; }
.badge {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .3rem .8rem; border-radius: 999px; font-size: .9rem; font-weight: 700;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--dim);
}
.badge.work { color: var(--accent-ink); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.badge.short { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 45%, transparent); }
.badge.long { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 45%, transparent); }
.dots { display: flex; gap: .4rem; align-items: center; }
.dots i { width: .55rem; height: .55rem; border-radius: 50%; background: var(--border); display: block; }
.dots i.on { background: var(--accent); }
.dots i.done { background: var(--ok); }

/* ---------- settings panel ---------- */
.panel {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.15rem 1.25rem; margin: 1rem auto 0;
  text-align: left; max-width: 30rem;
}
.panel h2 { font-size: 1rem; margin-bottom: .6rem; }
.panel .grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr)); gap: .8rem .9rem; }
.panel label { font-size: .85rem; color: var(--dim); display: block; }
.panel input {
  width: 100%; margin-top: .25rem; padding: .5rem .6rem;
  font-size: 1.05rem; font-weight: 650; font-variant-numeric: tabular-nums;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.panel input:focus { border-color: var(--accent); outline: none; }
.panel .hint { font-size: .82rem; color: var(--dim); margin-top: .7rem; }
.hidden { display: none !important; }

.seg-tabs { display: flex; justify-content: center; gap: .5rem; margin-block: .8rem; }
.seg-tabs button {
  padding: .45rem 1rem; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-elev); font-weight: 650; cursor: pointer;
}
.seg-tabs button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- interval plan ---------- */
.plan-wrap { max-width: 26rem; margin: 1rem auto 0; text-align: left; }
.plan { list-style: none; padding: 0; max-height: 17rem; overflow-y: auto; }
.plan li {
  display: flex; justify-content: space-between; gap: .9rem;
  padding: .42rem .8rem; border-radius: var(--radius-sm); font-size: .95rem;
  color: var(--dim); font-variant-numeric: tabular-nums;
}
.plan li .k { display: inline-block; width: .8rem; flex: none; text-align: center; }
.plan li.active { background: var(--card); color: var(--text); font-weight: 700; box-shadow: var(--shadow); }
.plan li.active[data-kind="work"] { box-shadow: inset 3px 0 0 var(--hot); }
.plan li.active[data-kind="rest"] { box-shadow: inset 3px 0 0 var(--ok); }
.plan li.active[data-kind="prepare"], .plan li.active[data-kind="cooldown"] { box-shadow: inset 3px 0 0 var(--warn); }
.plan-meta { color: var(--dim); font-size: .9rem; text-align: center; margin-top: .5rem; }

/* ---------- prose / content blocks ---------- */
.content-block { max-width: 44rem; margin: 2.5rem auto 0; text-align: left; }
.content-block h2 { font-size: 1.3rem; letter-spacing: -.01em; margin: 1.6rem 0 .6rem; }
.content-block h3 { font-size: 1.05rem; margin: 1.2rem 0 .4rem; }
.content-block p, .content-block li { color: var(--dim); }
.content-block strong { color: var(--text); }
.content-block ul { padding-left: 1.2rem; }
/* inline links inside prose must be distinguishable by more than colour (WCAG) */
.content-block p a, .vcard a, .faq a { text-decoration: underline; text-underline-offset: 3px; font-weight: 600; }
kbd {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .85em; padding: .12em .45em; border-radius: 6px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-bottom-width: 2px; color: var(--text);
}
table.shortcuts { width: 100%; border-collapse: collapse; margin: .6rem 0; font-size: .95rem; }
table.shortcuts th, table.shortcuts td { text-align: left; padding: .45rem .6rem; border-bottom: 1px solid var(--border); }
table.shortcuts th { color: var(--text); font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; }
table.shortcuts td { color: var(--dim); }

/* ---------- FAQ ---------- */
.faq { max-width: 44rem; margin: 2rem auto 0; text-align: left; }
.faq h2 { font-size: 1.3rem; margin-bottom: .6rem; }
.faq details { border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-elev); margin-bottom: .55rem; overflow: hidden; }
.faq summary { padding: .8rem 1rem; cursor: pointer; font-weight: 650; list-style: none; position: relative; padding-right: 2.4rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 1rem; top: 50%; translate: 0 -50%; color: var(--dim); font-weight: 700; }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 1rem .9rem; color: var(--dim); }

/* ---------- ad slots ----------
   :empty → hidden until the AdSense snippet is pasted in.
   Once it contains markup, reserve a fixed height to keep CLS ~0. */
.ad-slot { display: block; text-align: center; }
.ad-slot:empty { display: none; }
.ad-slot:not(:empty) { min-height: 290px; margin-block: 1.25rem; }
.ad-anchor:not(:empty) { position: fixed; left: 0; right: 0; bottom: 0; z-index: 60; }

/* ---------- footer ---------- */
.site-foot { border-top: 1px solid var(--border); margin-top: 3rem; padding-block: 1.6rem; color: var(--dim); font-size: .92rem; }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: .8rem 1.4rem; align-items: center; justify-content: space-between; }
.site-foot nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.site-foot a { color: var(--dim); }
.site-foot a:hover { color: var(--text); }

/* ---------- misc ---------- */
.skip-link { position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff; padding: .6rem 1rem; border-radius: 0 0 var(--radius-sm) 0; z-index: 100; }
.skip-link:focus { left: 0; }
.vcard { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; max-width: 34rem; margin-inline: auto; }
.notfound { text-align: center; padding-block: 4rem 2rem; }
.notfound .display { font-size: clamp(4rem, 20vw, 9rem); color: var(--accent-strong); }
.center { text-align: center; }

/* ---------- time tracker (v1.1) ---------- */
.desc-row { display: flex; justify-content: center; margin-block: .2rem .9rem; }
.desc-row input {
  width: min(24rem, 100%);
  padding: .65rem .9rem; font-size: 1rem;
  background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.desc-row input:focus { border-color: var(--accent); outline: none; }
.desc-row input:disabled { opacity: .55; }

.entries-wrap {
  max-width: 46rem; margin: 1.6rem auto 0; text-align: left;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem 1.1rem 1.15rem;
}
.entries-head {
  display: flex; justify-content: space-between; align-items: center; gap: .8rem;
  flex-wrap: wrap; margin-bottom: .5rem;
}
.entries-head .sel-all { display: inline-flex; align-items: center; gap: .45rem; font-size: .92rem; color: var(--text); font-weight: 600; cursor: pointer; }
#entries-meta { color: var(--dim); font-size: .88rem; font-variant-numeric: tabular-nums; }

.entries { list-style: none; padding: 0; margin: 0; max-height: 21rem; overflow-y: auto; }
.entries li {
  display: flex; align-items: center; gap: .7rem;
  padding: .55rem .3rem; border-bottom: 1px solid var(--border);
  animation: lapin .25s ease;
}
.entries li:last-child { border-bottom: 0; }
.entries li.empty { color: var(--dim); font-size: .92rem; display: block; padding-block: 1.1rem; text-align: center; border-bottom: 0; }
.entries li.editing { background: var(--card); border-radius: var(--radius-sm); }
.entries .sel { flex: none; display: inline-flex; align-items: center; }
.entries input[type="checkbox"] { width: 1.15rem; height: 1.15rem; accent-color: var(--accent); cursor: pointer; }
.entries .entry-main { flex: 1; min-width: 0; }
.entries .entry-desc { font-weight: 600; overflow-wrap: anywhere; }
.entries .entry-desc .nod { color: var(--dim); font-weight: 400; }
.entries .entry-when { color: var(--dim); font-size: .82rem; font-variant-numeric: tabular-nums; margin-top: .1rem; }
.entries .entry-dur { flex: none; font-weight: 700; font-variant-numeric: tabular-nums; font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-size: .95rem; }
.entries .entry-actions { flex: none; display: flex; gap: .4rem; }
.entries .entry-edit { display: flex; gap: .5rem; flex: 1; flex-wrap: wrap; }
.entries .entry-edit input {
  flex: 1; min-width: 8rem; padding: .45rem .6rem; font-size: .95rem;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.entries .entry-edit input:focus { border-color: var(--accent); outline: none; }
.btn-small { min-height: 34px; padding: .25rem .7rem; font-size: .85rem; border-radius: var(--radius-sm); }

.export-row { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: .9rem; }
.export-row .btn:disabled { opacity: .45; cursor: default; }
.hint.center { text-align: center; color: var(--dim); font-size: .82rem; margin-top: .7rem; }

@media (max-width: 640px) {
  .entries li { flex-wrap: wrap; }
  .entries .entry-actions { width: 100%; justify-content: flex-end; }
  .export-row .btn { flex: 1 1 auto; }
}

/* ---------- motion / a11y ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .display.flash { color: var(--flash-color); }
}
@media (max-width: 640px) {
  .site-nav { order: 3; width: 100%; justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: .25rem; scrollbar-width: none; }
  .site-nav::-webkit-scrollbar { display: none; }
  .theme-toggle { margin-left: auto; }
  .controls { gap: .55rem; }
  .btn { padding-inline: 1rem; }
}
@media print {
  .site-head, .site-foot, .controls, .presets, .ad-slot { display: none !important; }
  body { background: #fff; color: #000; }
}