/* Learn - a calm, modern study app. Light and dark follow the device, or the choice in Settings. */
:root {
  --bg: #F5F6FA; --surface: #FFFFFF; --sunk: #EEF0F6; --ink: #0F1424; --ink-2: #545C72; --ink-3: #8A91A6; --line: #E3E6EF;
  --primary: #3B5BFD; --primary-2: #2F49D6; --primary-soft: #E7ECFF; --on-primary: #FFFFFF;
  --flame: #FF7A1A; --flame-soft: #FFEEDF; --good: #11A36A; --good-soft: #DDF5EA; --amber: #E59A12; --amber-soft: #FDF1D8; --bad: #D43B4C;
  --r-s: 10px; --r: 16px; --r-l: 24px;
  --shadow: 0 1px 2px rgba(15, 20, 36, .05), 0 8px 24px rgba(15, 20, 36, .06);
  --font: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0C1020; --surface: #141A2E; --sunk: #1B2238; --ink: #ECEFF7; --ink-2: #A9B0C5; --ink-3: #737B93; --line: #252D45;
  --primary: #7C93FF; --primary-2: #9AACFF; --primary-soft: #1E2650; --on-primary: #0C1020;
  --flame: #FF9447; --flame-soft: #3A2414; --good: #3FD198; --good-soft: #14352A; --amber: #F5B947; --amber-soft: #382B12; --bad: #FF7A88;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25); color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #0C1020; --surface: #141A2E; --sunk: #1B2238; --ink: #ECEFF7; --ink-2: #A9B0C5; --ink-3: #737B93; --line: #252D45;
  --primary: #7C93FF; --primary-2: #9AACFF; --primary-soft: #1E2650; --on-primary: #0C1020;
  --flame: #FF9447; --flame-soft: #3A2414; --good: #3FD198; --good-soft: #14352A; --amber: #F5B947; --amber-soft: #382B12; --bad: #FF7A88;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25); color-scheme: dark; }

*, *::before, *::after { box-sizing: inherit; }
html { scroll-padding-top: env(safe-area-inset-top, 0px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 15px/1.5 var(--font); -webkit-font-smoothing: antialiased; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; }
p { margin: 0; }
a { color: var(--primary); text-underline-offset: 2px; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---- shell: sidebar on wide screens, tab bar on phones ---- */
.shell { display: grid; grid-template-columns: 236px 1fr; min-height: 100vh; }
.side { position: sticky; top: 0; height: 100vh; padding: 22px 14px; border-right: 1px solid var(--line); background: var(--surface); display: flex; flex-direction: column; gap: 4px; }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 10px 18px; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.nav-a { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 12px; color: var(--ink-2); text-decoration: none; font-weight: 500; }
.nav-a:hover { background: var(--sunk); color: var(--ink); }
.nav-a[aria-current="page"] { background: var(--primary-soft); color: var(--primary); }
.nav-a .count { margin-left: auto; min-width: 22px; height: 22px; padding: 0 7px; border-radius: 999px; background: var(--flame); color: #fff; font-size: 12px; font-weight: 600; display: grid; place-items: center; }
.side .me { margin-top: auto; padding: 12px; font-size: 13px; color: var(--ink-3); border-top: 1px solid var(--line); }
.side .me b { display: block; color: var(--ink); font-weight: 500; }
.main { min-width: 0; padding: 32px clamp(16px, 4vw, 48px) 96px; max-width: 1180px; }
.tabbar { display: none; }

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .side { display: none; }
  .main { padding: 20px 16px calc(96px + env(safe-area-inset-bottom, 0px)); }
  .tabbar { display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
    background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--line); padding: 6px 4px calc(6px + env(safe-area-inset-bottom, 0px)); }
  .tabbar a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 6px 0; font-size: 11px; color: var(--ink-3); text-decoration: none; position: relative; }
  .tabbar a[aria-current="page"] { color: var(--primary); }
  .tabbar .dot { position: absolute; top: 3px; left: calc(50% + 8px); width: 8px; height: 8px; border-radius: 50%; background: var(--flame); }
}

/* ---- page header ---- */
.head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.head h1 { font-size: clamp(26px, 3.4vw, 34px); line-height: 1.15; }
.head p { color: var(--ink-2); margin-top: 4px; }
.sync { font-size: 13px; color: var(--ink-3); display: flex; align-items: center; gap: 6px; }
.sync i { width: 8px; height: 8px; border-radius: 50%; background: var(--good); display: inline-block; }
.sync.off i { background: var(--amber); }
.sync.err i { background: var(--bad); }
.icon-btn { display: none; }
@media (max-width: 900px) { .icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); } }

/* ---- building blocks ---- */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-l); padding: 22px; box-shadow: var(--shadow); }
.card h2 { font-size: 18px; }
.card .sub { color: var(--ink-2); font-size: 14px; margin-top: 2px; }
.grid { display: grid; gap: 16px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  border-radius: 12px; padding: 9px 14px; font-weight: 500; cursor: pointer; text-decoration: none; transition: background-color .15s, border-color .15s; }
.btn:hover { border-color: var(--ink-3); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
.btn.primary:hover { background: var(--primary-2); border-color: var(--primary-2); }
.btn.ghost { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: var(--sunk); }
.btn.big { padding: 13px 20px; font-size: 16px; border-radius: 14px; }
.btn.small { padding: 6px 10px; font-size: 13px; border-radius: 10px; }
.btn:disabled { opacity: .5; cursor: default; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 500; background: var(--sunk); color: var(--ink-2); }
.chip.good { background: var(--good-soft); color: var(--good); }
.chip.flame { background: var(--flame-soft); color: var(--flame); }
.chip.amber { background: var(--amber-soft); color: var(--amber); }
.chip.blue { background: var(--primary-soft); color: var(--primary); }
label.f { display: block; }
label.f > span { display: block; font-size: 13px; color: var(--ink-2); margin-bottom: 6px; font-weight: 500; }
.in, select.in, textarea.in { width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: 12px; padding: 10px 12px; }
textarea.in { min-height: 76px; resize: vertical; }
.in:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px var(--primary-soft); }
.muted { color: var(--ink-3); }
.empty { color: var(--ink-3); font-size: 14px; padding: 18px; text-align: center; border: 1px dashed var(--line); border-radius: var(--r); }

/* ---- Today ---- */
.today { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(280px, 1fr); gap: 20px; align-items: start; }
@media (max-width: 1100px) { .today { grid-template-columns: 1fr; } }
.hero { padding: 26px; position: relative; overflow: hidden; }
.hero .where { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.hero h2 { font-size: clamp(22px, 2.6vw, 28px); line-height: 1.2; }
.task-block { margin-top: 18px; padding: 16px 18px; border-radius: var(--r); background: var(--sunk); }
.task-block .lbl { font-size: 12.5px; font-weight: 600; color: var(--ink-3); margin-bottom: 4px; display: flex; gap: 8px; align-items: center; }
.task-block .txt { font-size: 16px; }
.task-block.done { background: var(--good-soft); }
.task-block.done .lbl { color: var(--good); }
.focus { display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center; margin-top: 22px; }
@media (max-width: 560px) { .focus { grid-template-columns: 1fr; justify-items: center; text-align: center; } }
.ring { position: relative; width: 168px; height: 168px; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring .track { stroke: var(--sunk); }
.ring .bar { stroke: var(--primary); stroke-linecap: round; transition: stroke-dashoffset .4s ease; }
.ring .center { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.ring .time { font-size: 34px; font-weight: 600; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.ring .of { font-size: 12.5px; color: var(--ink-3); }
.focus .actions { display: flex; gap: 10px; flex-wrap: wrap; }
.focus p { color: var(--ink-2); font-size: 14px; margin-bottom: 14px; max-width: 42ch; }
.addmins { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 14px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 6px; }
.stat b { font-size: 26px; font-weight: 600; letter-spacing: -0.03em; line-height: 1; }
.stat span { font-size: 12.5px; color: var(--ink-2); }
a.stat, a.stat b, a.stat span { color: inherit; text-decoration: none; }
.stat .ic { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; }
.goal-ring { display: flex; align-items: center; gap: 16px; }
.goal-ring .ring { width: 76px; height: 76px; }
.goal-ring .ring .bar { stroke: var(--good); }
.goal-ring .ring .time { font-size: 15px; }
.next-list { list-style: none; margin: 10px 0 0; padding: 0; }
.next-list li { display: flex; gap: 12px; align-items: center; padding: 10px 0; border-top: 1px solid var(--line); }
.next-list li:first-child { border-top: 0; }
.next-list .n { width: 34px; height: 34px; border-radius: 10px; background: var(--sunk); display: grid; place-items: center; font-size: 12px; font-weight: 600; color: var(--ink-2); flex: none; }
.next-list .t { font-size: 14px; }
.next-list .t small { display: block; color: var(--ink-3); font-size: 12.5px; }
.note-row { margin-top: 18px; }
.celebrate { text-align: center; padding: 30px 10px; }
.celebrate .big { font-size: 44px; line-height: 1; margin-bottom: 8px; }

/* ---- Path ---- */
.path-wrap { display: grid; grid-template-columns: minmax(300px, 440px) minmax(0, 1fr); gap: 24px; align-items: start; }
@media (max-width: 900px) { .path-wrap { grid-template-columns: 1fr; } }
.path { position: relative; padding: 8px 0; }
.path::before { content: ""; position: absolute; left: 50%; top: 30px; bottom: 30px; width: 3px; margin-left: -1.5px; background: var(--line); border-radius: 2px; }
.node { position: relative; display: flex; align-items: center; gap: 14px; width: 100%; background: none; border: 0; padding: 10px 0; cursor: pointer; text-align: left; }
.node:nth-child(odd) { padding-right: 50%; flex-direction: row-reverse; text-align: right; }
.node:nth-child(even) { padding-left: 50%; }
.node .dot { position: absolute; left: 50%; transform: translateX(-50%); width: 58px; height: 58px; border-radius: 50%; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); display: grid; place-items: center; z-index: 1; }
.node .dot svg { position: absolute; inset: 3px; width: calc(100% - 6px); height: calc(100% - 6px); transform: rotate(-90deg); }
.node .dot .num { font-weight: 700; font-size: 16px; }
.node .lbl { font-size: 14px; color: var(--ink-2); flex: 1; min-width: 0; margin-left: 40px; }
.node:nth-child(odd) .lbl { margin-left: 0; margin-right: 40px; }
.node .lbl b { display: block; color: var(--ink); font-weight: 600; font-size: 14.5px; }
.node.now .dot { border: 2px solid var(--primary); box-shadow: 0 0 0 6px var(--primary-soft); }
.node.done .dot { background: var(--good); border-color: var(--good); color: #fff; }
.node[aria-pressed="true"] .lbl b { color: var(--primary); }
.week h2 { font-size: 22px; }
.days { list-style: none; margin: 16px 0 0; padding: 0; }
.day { display: grid; grid-template-columns: 74px 1fr; gap: 12px; padding: 14px 0; border-top: 1px solid var(--line); }
.day:first-child { border-top: 0; }
.day .dn { font-weight: 600; font-size: 14px; }
.day .dn small { display: block; color: var(--ink-3); font-weight: 400; font-size: 12px; }
.check { display: flex; gap: 10px; align-items: flex-start; padding: 6px 0; cursor: pointer; }
.check input { appearance: none; -webkit-appearance: none; width: 22px; height: 22px; border-radius: 7px; border: 2px solid var(--line); background: var(--surface); flex: none; margin: 1px 0 0; display: grid; place-items: center; cursor: pointer; transition: background-color .15s, border-color .15s; }
.check input::after { content: ""; width: 10px; height: 6px; border: 2.5px solid #fff; border-top: 0; border-right: 0; transform: rotate(-45deg) translate(1px, -1px); opacity: 0; }
.check input:checked { background: var(--good); border-color: var(--good); }
.check input.st:checked { background: var(--amber); border-color: var(--amber); }
.check input:checked::after { opacity: 1; }
.check .k { font-size: 12px; color: var(--ink-3); display: block; }
.log-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
@media (max-width: 640px) { .log-grid { grid-template-columns: 1fr; } }

/* ---- Review ---- */
.review-card { padding: 24px; }
.review-card h2 { font-size: 22px; margin: 8px 0 6px; }
.review-card ol { margin: 14px 0 0; padding-left: 20px; color: var(--ink-2); }
.review-card ol li { margin: 4px 0; }
.grades { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }
.grades .btn { flex-direction: column; gap: 2px; padding: 12px; }
.grades .btn small { font-weight: 400; color: var(--ink-3); font-size: 12px; }
.mastery { list-style: none; margin: 8px 0 0; padding: 0; }
.mastery li { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.mastery li:first-child { border-top: 0; }
.mastery .bars { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.mastery .bars i { height: 6px; border-radius: 3px; background: var(--sunk); }
.mastery .bars i.on { background: var(--primary); }
.mastery .lv { font-size: 12.5px; color: var(--ink-2); }

/* ---- Certifications ---- */
.certs { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.cert .top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.cert .code { font-size: 22px; font-weight: 700; letter-spacing: -0.03em; }
.cert .nm { color: var(--ink-2); font-size: 14px; }
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; margin: 16px 0 6px; }
.steps button { height: 8px; border: 0; padding: 0; border-radius: 4px; background: var(--sunk); cursor: pointer; }
.steps button.on { background: var(--primary); }
.steps-l { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--ink-2); margin-bottom: 14px; }
.cert .row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }
.countdown { font-size: 13px; font-weight: 500; }

/* ---- Goals ---- */
.add-goal { display: grid; grid-template-columns: 160px 1fr 1fr 160px auto; gap: 10px; align-items: end; }
@media (max-width: 900px) { .add-goal { grid-template-columns: 1fr 1fr; } .add-goal .wide { grid-column: 1 / -1; } }
.seg { display: inline-flex; background: var(--sunk); border-radius: 12px; padding: 3px; gap: 2px; margin: 18px 0 6px; flex-wrap: wrap; }
.seg button { border: 0; background: none; padding: 7px 12px; border-radius: 9px; cursor: pointer; color: var(--ink-2); font-weight: 500; font-size: 14px; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.entries { list-style: none; margin: 0; padding: 0; }
.entry { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: start; padding: 14px 0; border-top: 1px solid var(--line); }
.entry:first-child { border-top: 0; }
.entry .ic { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; }
.entry .what { font-weight: 500; }
.entry .why { color: var(--ink-2); font-size: 14px; }
.entry .meta { font-size: 12.5px; color: var(--ink-3); }
.entry.done .what { text-decoration: line-through; color: var(--ink-3); }

/* ---- Settings ---- */
.settings { display: grid; gap: 16px; max-width: 720px; }
.settings .row { display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center; padding: 14px 0; border-top: 1px solid var(--line); }
.settings .row:first-of-type { border-top: 0; }
.settings .row p { color: var(--ink-2); font-size: 13.5px; }

/* ---- sign-in, toast, loading ---- */
.solo { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.solo-card { width: 100%; max-width: 400px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-l); padding: 34px 28px; text-align: center; box-shadow: var(--shadow); }
.solo-card h1 { font-size: 26px; margin: 16px 0 8px; }
.solo-card p { color: var(--ink-2); margin-bottom: 22px; }
.solo-card .btn { width: 100%; }
.boot { min-height: 100vh; display: grid; place-content: center; justify-items: center; gap: 14px; color: var(--ink-3); }
#toast { position: fixed; left: 50%; bottom: calc(92px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%) translateY(20px); background: var(--ink); color: var(--bg);
  padding: 10px 16px; border-radius: 12px; font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 50; max-width: calc(100vw - 32px); }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@media (min-width: 901px) { #toast { bottom: 28px; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; } }

/* ---- resources ---- */
.res-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.res { display: inline-flex; align-items: center; gap: 7px; padding: 7px 11px; border-radius: 10px; background: var(--surface); border: 1px solid var(--line); color: var(--ink); text-decoration: none; font-size: 13.5px; font-weight: 500; max-width: 100%; }
.res span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.res svg { flex: none; color: var(--primary); }
.res:hover { border-color: var(--primary); }
.res.seen { color: var(--ink-2); }
.res.seen svg:last-child { color: var(--good); }
.res.ghost { background: transparent; border-style: dashed; color: var(--ink-2); }
.task-block .res { background: var(--surface); }
.lib-bar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.lib-search { position: relative; flex: 1; min-width: 220px; }
.lib-search svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--ink-3); }
.lib-search .in { padding-left: 38px; }
.lib-week { padding: 16px 0; border-top: 1px solid var(--line); }
.lib-week:first-child { border-top: 0; }
.lib-week h3 { font-size: 15px; display: flex; gap: 8px; align-items: baseline; }
.lib-week h3 .muted { font-weight: 400; font-size: 13px; }

/* ---- insights ---- */
.stats-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 760px) { .stats-4 { grid-template-columns: repeat(2, 1fr); } }
.big-num { font-size: 34px; font-weight: 600; letter-spacing: -0.03em; margin: 8px 0 4px; }
.big-num span { font-size: 14px; font-weight: 400; color: var(--ink-2); letter-spacing: 0; }
.heat { display: grid; grid-template-columns: auto repeat(12, 1fr); gap: 4px; margin-top: 14px; }
.heat-days, .heat-col { display: grid; grid-template-rows: repeat(7, 1fr); gap: 4px; }
.heat-days span { font-size: 10.5px; color: var(--ink-3); line-height: 1; display: flex; align-items: center; padding-right: 4px; }
.heat i, .heat-key i { display: block; aspect-ratio: 1; border-radius: 4px; background: var(--sunk); min-width: 10px; }
.heat i.fut { background: transparent; border: 1px dashed var(--line); }
.heat i.l1, .heat-key i.l1 { background: color-mix(in srgb, var(--good) 30%, var(--sunk)); }
.heat i.l2, .heat-key i.l2 { background: color-mix(in srgb, var(--good) 55%, var(--sunk)); }
.heat i.l3, .heat-key i.l3 { background: color-mix(in srgb, var(--good) 80%, var(--sunk)); }
.heat i.l4, .heat-key i.l4 { background: var(--good); }
.heat-key { display: flex; gap: 4px; align-items: center; justify-content: flex-end; font-size: 11.5px; color: var(--ink-3); margin-top: 10px; }
.heat-key i { width: 12px; min-width: 12px; }
@media (max-width: 900px) { .tabbar { grid-template-columns: repeat(5, 1fr); } }