/* TOEFL Coach 2026 — design system */
:root {
  --bg: #f5f6fa; --surface: #ffffff; --surface-2: #f0f2f8; --border: #e2e5ee; --border-strong: #c9cedc;
  --text: #171a26; --muted: #5b6275; --faint: #8a91a5;
  --primary: #4f46e5; --primary-ink: #ffffff; --primary-soft: #eceafe; --primary-text: #4338ca;
  --ok: #0f8a5f; --ok-soft: #e2f6ee; --bad: #c8322f; --bad-soft: #fdecec; --warn: #a15c07; --warn-soft: #fdf3dc;
  --reading: #2563eb; --listening: #0d8f8a; --speaking: #d9601a; --writing: #8b3fd9; --mix: #5b6275;
  --shadow: 0 1px 2px rgba(20,24,40,.06), 0 4px 16px rgba(20,24,40,.05);
  --radius: 14px; --radius-sm: 9px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --nav-w: 232px; --safe-b: env(safe-area-inset-bottom, 0px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0f1118; --surface: #181b25; --surface-2: #20242f; --border: #2a2f3d; --border-strong: #3b4153;
  --text: #eceef5; --muted: #a3aabd; --faint: #7a8196;
  --primary: #8b85ff; --primary-ink: #11121a; --primary-soft: #26254a; --primary-text: #b4b0ff;
  --ok: #46c794; --ok-soft: #153328; --bad: #f07a76; --bad-soft: #3a1c1d; --warn: #e5b04e; --warn-soft: #382b12;
  --reading: #6ea0ff; --listening: #45c9c2; --speaking: #f59555; --writing: #bb86f7; --mix: #a3aabd;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.25); color-scheme: dark;
} }
:root[data-theme="dark"] {
  --bg: #0f1118; --surface: #181b25; --surface-2: #20242f; --border: #2a2f3d; --border-strong: #3b4153;
  --text: #eceef5; --muted: #a3aabd; --faint: #7a8196;
  --primary: #8b85ff; --primary-ink: #11121a; --primary-soft: #26254a; --primary-text: #b4b0ff;
  --ok: #46c794; --ok-soft: #153328; --bad: #f07a76; --bad-soft: #3a1c1d; --warn: #e5b04e; --warn-soft: #382b12;
  --reading: #6ea0ff; --listening: #45c9c2; --speaking: #f59555; --writing: #bb86f7; --mix: #a3aabd;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.25); color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.55 var(--font); -webkit-font-smoothing: antialiased; }
h1, h2, h3, h4 { margin: 0; line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: 24px; } h2 { font-size: 18px; } h3 { font-size: 15.5px; } h4 { font-size: 14px; }
p { margin: 0 0 .7em; } p:last-child { margin-bottom: 0; }
a { color: var(--primary-text); text-decoration: none; } a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
.muted { color: var(--muted); } .faint { color: var(--faint); } .small { font-size: 13px; } .tiny { font-size: 12px; }
.center { text-align: center; } .right { text-align: right; } .bold { font-weight: 650; } .nowrap { white-space: nowrap; }
.hide { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* Boot */
.boot { min-height: 100vh; display: grid; place-content: center; text-align: center; color: var(--muted); gap: 10px; }
.boot-logo, .logo { width: 44px; height: 44px; border-radius: 12px; background: var(--primary); color: var(--primary-ink); display: grid; place-content: center; font-weight: 800; letter-spacing: -.02em; margin: 0 auto; }

/* Shell */
.shell { min-height: 100vh; display: grid; grid-template-columns: var(--nav-w) 1fr; }
.side { position: sticky; top: 0; height: 100vh; border-right: 1px solid var(--border); background: var(--surface); padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 14px; }
.brand .logo { margin: 0; width: 36px; height: 36px; border-radius: 10px; font-size: 14px; }
.brand b { font-size: 15px; display: block; line-height: 1.2; } .brand span { font-size: 12px; color: var(--muted); }
.nav-item { display: flex; align-items: center; gap: 11px; padding: 9px 10px; border-radius: 10px; color: var(--muted); font-weight: 550; border: 0; background: none; cursor: pointer; text-align: left; width: 100%; }
.nav-item:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.nav-item.on { background: var(--primary-soft); color: var(--primary-text); }
.nav-item .badge { margin-left: auto; }
.nav-sep { height: 1px; background: var(--border); margin: 8px 6px; }
.side-foot { margin-top: auto; padding: 8px; font-size: 12px; color: var(--muted); display: grid; gap: 6px; }
.main { min-width: 0; padding: 26px 32px 60px; }
.page { max-width: 1060px; margin: 0 auto; display: grid; gap: 18px; }
.page.narrow { max-width: 760px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.page-head p { color: var(--muted); margin: 4px 0 0; }
.tabbar { display: none; }
.topbar { display: none; }
@media (max-width: 880px) {
  .shell { grid-template-columns: 1fr; }
  .side { display: none; }
  .main { padding: 14px 14px calc(84px + var(--safe-b)); }
  .topbar { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 14px; position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
  .topbar .brand { padding: 0; } .topbar .brand span { display: none; }
  .tabbar { display: grid; grid-template-columns: repeat(5, 1fr); position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; background: var(--surface); border-top: 1px solid var(--border); padding: 6px 6px calc(6px + var(--safe-b)); }
  .tab { display: grid; justify-items: center; gap: 2px; padding: 6px 2px; border-radius: 10px; color: var(--muted); font-size: 11px; font-weight: 600; border: 0; background: none; position: relative; }
  .tab.on { color: var(--primary-text); background: var(--primary-soft); }
  .tab .badge { position: absolute; top: 2px; right: calc(50% - 22px); }
  h1 { font-size: 21px; }
  body.in-session .tabbar, body.in-session .topbar { display: none; }
  body.in-session .main { padding-bottom: 24px; }
}

/* Primitives */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); min-width: 0; }
.card.flat { box-shadow: none; } .card.tight { padding: 13px 14px; }
.card.accent { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); background: linear-gradient(180deg, var(--primary-soft), var(--surface) 70%); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } .g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.g-main { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); align-items: start; }
@media (max-width: 880px) { .g2, .g3, .g-main { grid-template-columns: 1fr; } .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; } .row.between { justify-content: space-between; } .row.nowrap { flex-wrap: nowrap; }
.col { display: grid; gap: 10px; } .grow { flex: 1; min-width: 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 40px; padding: 8px 16px; border-radius: 10px; border: 1px solid var(--border-strong); background: var(--surface); font-weight: 600; cursor: pointer; transition: transform .05s, background .15s; text-decoration: none !important; color: var(--text); }
.btn:hover { background: var(--surface-2); } .btn:active { transform: translateY(1px); }
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: transparent; } .btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { border-color: transparent; background: transparent; color: var(--muted); } .btn.ghost:hover { background: var(--surface-2); color: var(--text); }
.btn.danger { color: var(--bad); } .btn.sm { min-height: 32px; padding: 4px 11px; font-size: 13px; border-radius: 8px; } .btn.lg { min-height: 48px; padding: 10px 22px; font-size: 16px; }
.btn.block { width: 100%; } .btn[disabled] { opacity: .5; cursor: not-allowed; }
.icon { width: 18px; height: 18px; flex: none; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon.lg { width: 22px; height: 22px; }
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 1px 8px; border-radius: 999px; font-size: 11.5px; font-weight: 700; background: var(--surface-2); color: var(--muted); white-space: nowrap; }
.badge.p { background: var(--primary-soft); color: var(--primary-text); } .badge.ok { background: var(--ok-soft); color: var(--ok); } .badge.bad { background: var(--bad-soft); color: var(--bad); } .badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.dot { min-width: 18px; justify-content: center; background: var(--bad); color: #fff; padding: 0 5px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--border-strong); background: var(--surface); font-size: 13px; font-weight: 600; cursor: pointer; }
.chip.on { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.sk { --c: var(--mix); } .sk.reading { --c: var(--reading); } .sk.listening { --c: var(--listening); } .sk.speaking { --c: var(--speaking); } .sk.writing { --c: var(--writing); }
.sk-dot { width: 10px; height: 10px; border-radius: 3px; background: var(--c); flex: none; }
.sk-ico { width: 38px; height: 38px; border-radius: 11px; display: grid; place-content: center; background: color-mix(in srgb, var(--c) 14%, transparent); color: var(--c); flex: none; }
.bar { height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; } .bar > i { display: block; height: 100%; border-radius: 99px; background: var(--c, var(--primary)); transition: width .4s; }
.bar.thin { height: 5px; }
.note { border-radius: var(--radius-sm); padding: 10px 13px; font-size: 13.5px; background: var(--surface-2); color: var(--muted); border-left: 3px solid var(--border-strong); }
.note.warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); } .note.ok { background: var(--ok-soft); color: var(--ok); border-color: var(--ok); }
.note.bad { background: var(--bad-soft); color: var(--bad); border-color: var(--bad); } .note.p { background: var(--primary-soft); color: var(--primary-text); border-color: var(--primary); }
.field { display: grid; gap: 5px; } .field > span { font-size: 13px; font-weight: 600; color: var(--muted); }
input[type=text], input[type=email], input[type=password], input[type=date], input[type=time], input[type=number], select, textarea { width: 100%; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border-strong); background: var(--surface); min-height: 40px; }
textarea { resize: vertical; line-height: 1.6; }
.list { display: grid; } .list > * { padding: 11px 0; border-bottom: 1px solid var(--border); } .list > *:last-child { border-bottom: 0; padding-bottom: 0; } .list > *:first-child { padding-top: 0; }
.stat { display: grid; gap: 2px; } .stat b { font-size: 24px; line-height: 1.1; letter-spacing: -.02em; } .stat span { font-size: 12.5px; color: var(--muted); }
.ring { --p: 0; width: 76px; height: 76px; border-radius: 50%; background: conic-gradient(var(--primary) calc(var(--p) * 1%), var(--surface-2) 0); display: grid; place-content: center; flex: none; }
.ring > div { width: 60px; height: 60px; border-radius: 50%; background: var(--surface); display: grid; place-content: center; font-weight: 750; font-size: 15px; }
table.t { width: 100%; border-collapse: collapse; font-size: 13.5px; } table.t th, table.t td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--border); vertical-align: top; } table.t th { color: var(--muted); font-weight: 600; font-size: 12.5px; }
.scroll-x { overflow-x: auto; }
details > summary { cursor: pointer; font-weight: 600; color: var(--primary-text); } details[open] > summary { margin-bottom: 8px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 6px 0; }

/* Activity list (plan) */
.act { display: flex; align-items: center; gap: 12px; padding: 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); cursor: pointer; text-align: left; width: 100%; }
.act:hover { border-color: var(--primary); } .act.done { opacity: .62; } .act.done .act-title { text-decoration: line-through; }
.act-title { font-weight: 650; } .act-why { font-size: 12.5px; color: var(--muted); }
.act .check { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--border-strong); flex: none; display: grid; place-content: center; color: #fff; }
.act.done .check { background: var(--ok); border-color: var(--ok); }

/* Session runner */
.session { max-width: 1100px; margin: 0 auto; display: grid; gap: 14px; }
.sess-bar { display: flex; align-items: center; gap: 12px; position: sticky; top: 0; z-index: 15; background: var(--bg); padding: 8px 0; }
.sess-bar .bar { flex: 1; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; padding: 4px 10px; border-radius: 8px; background: var(--surface); border: 1px solid var(--border); }
.timer.low { color: var(--bad); border-color: var(--bad); }
.split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 880px) { .split { grid-template-columns: 1fr; } }
.passage { font-family: var(--serif); font-size: 16.5px; line-height: 1.75; }
.passage h3 { font-family: var(--font); margin-bottom: 8px; }
.doc { border: 1px solid var(--border-strong); border-radius: 10px; padding: 14px 16px; background: var(--surface-2); font-size: 14.5px; white-space: pre-wrap; }
.doc .doc-kind { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--faint); font-weight: 700; display: block; margin-bottom: 6px; }
.q { display: grid; gap: 8px; padding: 14px 0; border-bottom: 1px solid var(--border); } .q:last-child { border-bottom: 0; }
.q-stem { font-weight: 620; }
.opt { display: flex; gap: 10px; align-items: flex-start; padding: 9px 12px; border: 1px solid var(--border-strong); border-radius: 10px; cursor: pointer; background: var(--surface); text-align: left; width: 100%; }
.opt:hover { border-color: var(--primary); } .opt.sel { border-color: var(--primary); background: var(--primary-soft); }
.opt.right { border-color: var(--ok); background: var(--ok-soft); } .opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt .k { width: 22px; height: 22px; border-radius: 50%; border: 1.5px solid var(--border-strong); display: grid; place-content: center; font-size: 12px; font-weight: 700; flex: none; }
.opt.sel .k { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.opt[disabled] { cursor: default; }
.fb { border-radius: 10px; padding: 10px 12px; font-size: 14px; display: grid; gap: 6px; } .fb.ok { background: var(--ok-soft); } .fb.bad { background: var(--bad-soft); } .fb.info { background: var(--surface-2); }
.fb .vi { color: var(--muted); }
.ctw { font-family: var(--serif); font-size: 17px; line-height: 2.3; }
.ctw .gap { display: inline-flex; align-items: baseline; white-space: nowrap; }
.ctw input { width: auto; min-height: 0; padding: 1px 4px; border: 0; border-bottom: 2px solid var(--primary); border-radius: 4px 4px 0 0; background: var(--primary-soft); font-family: ui-monospace, Consolas, monospace; font-size: 15.5px; letter-spacing: .12em; }
.ctw input.right { border-color: var(--ok); background: var(--ok-soft); } .ctw input.wrong { border-color: var(--bad); background: var(--bad-soft); }
.ctw .fix { font-family: var(--font); font-size: 12px; color: var(--ok); font-weight: 700; margin-left: 3px; }
.bas-line { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; min-height: 52px; padding: 10px; border: 1.5px dashed var(--border-strong); border-radius: 12px; font-size: 16px; }
.bas-pool { display: flex; flex-wrap: wrap; gap: 8px; }
.tile { padding: 7px 13px; border-radius: 9px; border: 1px solid var(--border-strong); background: var(--surface); font-weight: 600; cursor: pointer; font-size: 15px; }
.tile.used { opacity: .25; pointer-events: none; } .tile.in { background: var(--primary-soft); border-color: var(--primary); color: var(--primary-text); }
.audio-box { display: flex; align-items: center; gap: 12px; padding: 14px; border-radius: 12px; background: var(--surface-2); }
.audio-box .wave { display: flex; gap: 3px; align-items: center; height: 26px; } .audio-box .wave i { width: 3px; height: 8px; background: var(--faint); border-radius: 2px; }
.audio-box.playing .wave i { background: var(--listening); animation: wave 1s ease-in-out infinite; } .audio-box.playing .wave i:nth-child(2n) { animation-delay: .2s; } .audio-box.playing .wave i:nth-child(3n) { animation-delay: .4s; }
@keyframes wave { 0%, 100% { height: 6px; } 50% { height: 24px; } }
.rec-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--bad); animation: pulse 1s infinite; } @keyframes pulse { 50% { opacity: .3; } }
.editor { min-height: 220px; font-size: 15.5px; }
.rubric { display: grid; gap: 6px; } .rubric button { text-align: left; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border-strong); background: var(--surface); cursor: pointer; display: grid; grid-template-columns: 30px 1fr; gap: 8px; font-size: 13.5px; }
.rubric button.sel { border-color: var(--primary); background: var(--primary-soft); } .rubric button b { font-size: 17px; }
.diff del { background: var(--bad-soft); color: var(--bad); text-decoration: line-through; padding: 0 2px; border-radius: 3px; } .diff ins { background: var(--warn-soft); color: var(--warn); text-decoration: none; padding: 0 2px; border-radius: 3px; } .diff .okw { color: var(--ok); }
mark { background: var(--warn-soft); color: inherit; border-radius: 3px; padding: 0 2px; }

/* Flashcards */
.flash { min-height: 230px; display: grid; place-content: center; text-align: center; gap: 10px; padding: 26px 18px; }
.flash .word { font-size: 30px; font-weight: 750; letter-spacing: -.02em; }
.grade { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; } .grade .btn { flex-direction: column; gap: 0; min-height: 52px; } .grade small { font-weight: 500; color: var(--muted); font-size: 11px; }

/* Charts */
.spark { width: 100%; height: 120px; display: block; } .spark .axis { stroke: var(--border); stroke-width: 1; } .spark text { fill: var(--faint); font-size: 10px; }
.heat { display: grid; grid-template-columns: repeat(auto-fill, minmax(14px, 1fr)); gap: 4px; } .heat i { aspect-ratio: 1; border-radius: 4px; background: var(--surface-2); } .heat i.l1 { background: color-mix(in srgb, var(--primary) 30%, var(--surface-2)); } .heat i.l2 { background: color-mix(in srgb, var(--primary) 60%, var(--surface-2)); } .heat i.l3 { background: var(--primary); } .heat i.today { outline: 2px solid var(--text); outline-offset: 1px; }

/* Overlays */
.toast-wrap { position: fixed; left: 50%; bottom: calc(92px + var(--safe-b)); transform: translateX(-50%); z-index: 90; display: grid; gap: 8px; width: min(92vw, 420px); pointer-events: none; }
@media (min-width: 881px) { .toast-wrap { bottom: 28px; } }
.toast { background: var(--text); color: var(--bg); padding: 10px 14px; border-radius: 10px; font-size: 14px; font-weight: 550; box-shadow: var(--shadow); animation: up .2s; }
@keyframes up { from { opacity: 0; transform: translateY(8px); } }
.modal-back { position: fixed; inset: 0; background: rgba(8,10,20,.55); z-index: 80; display: grid; place-items: center; padding: 16px; }
.modal { background: var(--surface); border-radius: 16px; padding: 22px; width: min(100%, 520px); max-height: 88vh; overflow: auto; display: grid; gap: 14px; box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.banner { display: flex; gap: 10px; align-items: center; padding: 9px 13px; border-radius: 10px; font-size: 13.5px; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }
@media print { .side, .tabbar, .topbar { display: none; } }

/* Focus mode while a session is running (desktop) */
body.in-session .shell { grid-template-columns: 1fr; }
body.in-session .side { display: none; }
.ctw input.right, input.right { border-color: var(--ok) !important; background: var(--ok-soft) !important; }
.ctw input.wrong, input.wrong { border-color: var(--bad) !important; background: var(--bad-soft) !important; }
.test-ok { color: var(--ok); } .test-bad { color: var(--bad); font-weight: 700; }
/* text inside non-wrapping rows may shrink and wrap instead of overflowing */
.row.nowrap > span:not(.badge):not(.timer):not(.sk-ico):not(.check):not(.sk-dot), .row.nowrap > div:not(.ring):not(.logo) { min-width: 0; overflow-wrap: anywhere; }
.main, .page, .session { min-width: 0; }
.row.nowrap { white-space: normal; }