/* 学习中心 — console look: dot grid + glow, gradient title, mono labels, terminal-window panels.
 * Dark is the main theme; light is "graph paper". Module accents are brighter versions of each module's colour. */
:root {
  --bg: #f4f2ec; --surface: rgba(255, 253, 248, .82); --surface-solid: #fffdf8; --surface-2: #ebe7dd;
  --text: #16181f; --muted: #686c78; --line: #dcd6c8; --line-strong: #c9c2b2;
  --grid: rgba(60, 50, 30, .07);
  --accent: #4f46e5; --danger: #c2341f;
  --g1: #0f8f7e; --g2: #6d5ce8; --g3: #3b82f6;  /* title gradient */
  --glow: rgba(109, 92, 232, .10);
  --c-nihongo: #5b55d6; --c-jlpt: #138a6a; --c-takken: #2f6fd0; --c-fp3: #0f7a73;
  /* heatmap: one hue (teal), light -> dark */
  --h0: #e6e1d5; --h1: #b3e0d6; --h2: #6cc4b2; --h3: #22998a; --h4: #0f6b60;
  --shadow: 0 6px 24px rgba(40, 35, 20, .06);
  --radius: 14px;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #07080c; --surface: rgba(20, 23, 32, .72); --surface-solid: #11141c; --surface-2: #1b1f2b;
    --text: #e9ebf2; --muted: #8b90a0; --line: rgba(255, 255, 255, .08); --line-strong: rgba(255, 255, 255, .16);
    --grid: rgba(255, 255, 255, .055);
    --accent: #8b7dff; --danger: #ff8a7a;
    --g1: #5eead4; --g2: #a78bfa; --g3: #60a5fa;
    --glow: rgba(94, 234, 212, .10);
    --c-nihongo: #a49bff; --c-jlpt: #4fd1a5; --c-takken: #5cb8ff; --c-fp3: #5cc8bd;
    --h0: #161a24; --h1: #12403f; --h2: #146b63; --h3: #22a091; --h4: #5eead4;
    --shadow: 0 10px 40px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #07080c; --surface: rgba(20, 23, 32, .72); --surface-solid: #11141c; --surface-2: #1b1f2b;
  --text: #e9ebf2; --muted: #8b90a0; --line: rgba(255, 255, 255, .08); --line-strong: rgba(255, 255, 255, .16);
  --grid: rgba(255, 255, 255, .055);
  --accent: #8b7dff; --danger: #ff8a7a;
  --g1: #5eead4; --g2: #a78bfa; --g3: #60a5fa;
  --glow: rgba(94, 234, 212, .10);
  --c-nihongo: #a49bff; --c-jlpt: #4fd1a5; --c-takken: #5cb8ff; --c-fp3: #5cc8bd;
  --h0: #161a24; --h1: #12403f; --h2: #146b63; --h3: #22a091; --h4: #5eead4;
  --shadow: 0 10px 40px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0; min-height: 100dvh; color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Noto Sans CJK SC", sans-serif;
  -webkit-text-size-adjust: 100%;
  /* two soft glows over a dot grid */
  background:
    radial-gradient(1000px 520px at 15% -10%, var(--glow), transparent 70%),
    radial-gradient(800px 480px at 95% 0%, color-mix(in srgb, var(--g2) 12%, transparent), transparent 70%),
    radial-gradient(circle, var(--grid) 1px, transparent 1.2px) 0 0 / 22px 22px,
    var(--bg);
  background-attachment: fixed;
}
main {
  max-width: 1040px; margin: 0 auto;
  padding: calc(14px + env(safe-area-inset-top, 0px)) 16px calc(40px + env(safe-area-inset-bottom, 0px));
}
main:has(.login) { max-width: 560px; }
a { color: inherit; }
.mono { font-family: var(--mono); letter-spacing: 0; }
.muted { color: var(--muted); }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.grad {
  background: linear-gradient(100deg, var(--g1), var(--g2) 55%, var(--g3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* top bar */
.bar { display: flex; align-items: center; gap: 12px; padding: 4px 0 6px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; flex: 1; min-width: 0; font-size: 14px; font-weight: 600; }
.brand b { color: var(--g1); }
.logo { display: inline-grid; grid-template-columns: repeat(2, 9px); gap: 2px; flex: none; }
.logo i { width: 9px; height: 9px; border-radius: 2px; background: var(--c-nihongo); }
.logo i:nth-child(2) { background: var(--c-jlpt); }
.logo i:nth-child(3) { background: var(--c-takken); }
.logo i:nth-child(4) { background: var(--c-fp3); }
.pill {
  display: inline-flex; align-items: center; gap: 7px; font-size: 11px; letter-spacing: .14em; color: var(--muted);
  padding: 5px 11px; border: 1px solid var(--line-strong); border-radius: 99px;
}
.pill i, .live i { width: 7px; height: 7px; border-radius: 50%; background: var(--g1); box-shadow: 0 0 10px var(--g1); animation: pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.avatar {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; flex: none; text-decoration: none;
  font-weight: 700; color: var(--text); border: 1px solid var(--line-strong); background: var(--surface);
}
.avatar:hover { border-color: var(--g2); }

/* hero */
.hero { padding: 34px 0 26px; }
.prompt { font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.prompt .pu { color: var(--g1); }
.prompt .pp { color: var(--g3); }
.prompt .pc { color: var(--text); }
.caret { display: inline-block; width: 8px; height: 1.05em; margin-left: 4px; vertical-align: -2px; background: var(--g1); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero h1 { margin: 12px 0 6px; font-size: clamp(36px, 7vw, 56px); line-height: 1.15; letter-spacing: .02em; font-weight: 800; }
.hero p { margin: 0; font-size: 15px; }
.loading { padding: 40px 0; text-align: center; }

/* overview */
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.kpi { padding: 14px 16px 12px; }
.kl { display: flex; align-items: baseline; gap: 8px; font-size: 12px; color: var(--muted); }
.kl .mono { font-size: 10.5px; letter-spacing: .16em; color: var(--g1); }
.kv { font-size: 32px; font-weight: 700; line-height: 1.15; margin-top: 6px; font-variant-numeric: tabular-nums; }
.kv small { font-family: -apple-system, "PingFang SC", sans-serif; font-size: 13px; font-weight: 500; color: var(--muted); margin-left: 4px; }
.panel { padding: 16px 18px 18px; margin-top: 14px; min-width: 0; }
.ph { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.ph h2 { margin: 0; font-size: 16px; flex: 1; min-width: 0; display: flex; align-items: center; gap: 10px; }
.ph > .muted { font-size: 12px; }
.tag { font-size: 10.5px; font-weight: 600; letter-spacing: .14em; color: var(--g1); padding: 1px 8px; border: 1px solid color-mix(in srgb, var(--g1) 40%, transparent); border-radius: 6px; }
.ph img { width: 30px; height: 30px; border-radius: 8px; flex: none; }
.ph .open { font-size: 12.5px; color: var(--muted); text-decoration: none; padding: 4px 0 4px 8px; }
.ph .open:hover { color: var(--mc, var(--g1)); }

/* heatmap */
.hm-wrap { display: flex; gap: 6px; }
.hm-days { display: grid; grid-template-rows: 13px repeat(7, 13px); row-gap: 3px; font-size: 10px; line-height: 13px; color: var(--muted); }
.hm-scroll { overflow-x: auto; scrollbar-width: none; min-width: 0; }
.hm-scroll::-webkit-scrollbar { display: none; }
.hm-months, .hm { display: grid; grid-auto-flow: column; grid-auto-columns: 13px; column-gap: 3px; }
.hm-months { height: 16px; font-size: 10px; color: var(--muted); white-space: nowrap; font-family: var(--mono); }
.hm-col { display: grid; grid-template-rows: repeat(7, 13px); row-gap: 3px; }
.hm i, .hm-legend i { display: block; width: 13px; height: 13px; border-radius: 3px; }
.l0 { background: var(--h0); } .l1 { background: var(--h1); } .l2 { background: var(--h2); }
.l3 { background: var(--h3); } .l4 { background: var(--h4); }
.hm-x { visibility: hidden; }
.hm-legend { display: flex; align-items: center; justify-content: flex-end; gap: 3px; font-size: 11px; margin-top: 10px; font-family: var(--mono); }
.tip { position: absolute; z-index: 10; pointer-events: none; padding: 5px 9px; border-radius: 8px; font-size: 12.5px;
  background: var(--surface-solid); color: var(--text); border: 1px solid var(--line-strong); white-space: nowrap; box-shadow: var(--shadow); }

/* module panels: terminal windows */
.mods { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); margin-top: 14px; }
.mods .panel { margin: 0; }
.mod { padding: 0; overflow: hidden; position: relative; transition: border-color .2s; }
.mod::before { content: ""; position: absolute; inset: 0 0 auto; height: 1px; background: linear-gradient(90deg, transparent, var(--mc), transparent); }
.mod:hover { border-color: color-mix(in srgb, var(--mc) 45%, var(--line)); }
.mod-nihongo { --mc: var(--c-nihongo); } .mod-jlpt { --mc: var(--c-jlpt); } .mod-takken { --mc: var(--c-takken); } .mod-fp3 { --mc: var(--c-fp3); }
.chrome { display: flex; align-items: center; gap: 10px; padding: 9px 14px; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--surface-2) 45%, transparent); }
.dots { display: flex; gap: 6px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); transition: background .2s; }
.mod:hover .dots i:nth-child(1), .login .dots i:nth-child(1) { background: #ff5f57; }
.mod:hover .dots i:nth-child(2), .login .dots i:nth-child(2) { background: #febc2e; }
.mod:hover .dots i:nth-child(3), .login .dots i:nth-child(3) { background: #28c840; }
.path { font-size: 12px; color: var(--muted); flex: 1; }
.live { display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--g1); }
.mb { padding: 14px 18px 18px; }
.mod .ph { margin: 0; padding: 14px 18px 0; }
.big { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.big b { font-size: 34px; line-height: 1.15; color: var(--mc); font-variant-numeric: tabular-nums; }
.big span { font-size: 13.5px; color: var(--muted); }
.sub-h { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 16px 0 8px; }
.bars { display: grid; gap: 8px; margin-top: 12px; }
.pbar { display: grid; grid-template-columns: 4.5em 1fr 4.5em; align-items: center; gap: 10px; font-size: 13px; }
.bars.wide .pbar { grid-template-columns: 7.5em 1fr 3em; }
.pbar .pl { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pbar .pr { text-align: right; color: var(--muted); font-family: var(--mono); font-size: 12px; font-variant-numeric: tabular-nums; }
.track { height: 6px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.track i { display: block; height: 100%; border-radius: 3px; background: var(--mc); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: 13px; padding: 3px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text); text-decoration: none; }
.chip:hover { border-color: var(--mc, var(--g1)); }
.chip small { color: var(--muted); font-family: var(--mono); font-size: 11px; }
.ja { font-family: "Hiragino Mincho ProN", "Noto Serif CJK JP", "Yu Mincho", serif; }
.scores { display: flex; gap: 6px; align-items: flex-end; height: 92px; }
.sc { flex: 1; max-width: 34px; height: 100%; display: flex; flex-direction: column; align-items: center; gap: 3px; }
.sv { font-size: 10.5px; color: var(--muted); font-family: var(--mono); }
.sb { flex: 1; width: 100%; display: flex; align-items: flex-end; }
.sb i { display: block; width: 100%; border-radius: 4px 4px 0 0; background: var(--mc); }
.row { display: flex; justify-content: space-between; gap: 10px; padding: 9px 0; font-size: 14px; text-decoration: none; border-top: 1px dashed var(--line-strong); }
.row:hover span:first-child { color: var(--mc); }
.row span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .muted { flex: none; font-family: var(--mono); font-size: 12px; }
.acts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.acts .btn { padding: 7px 13px; font-size: 13.5px; }
.acts .btn:last-child { border-color: color-mix(in srgb, var(--mc) 55%, transparent); color: var(--mc); }

/* account pages: one column on phones, two from 900px */
.hero.sm { padding: 22px 0 20px; }
.hero.sm h1 { font-size: clamp(30px, 5vw, 40px); margin-top: 8px; }
.back { display: inline-block; font-size: 12.5px; color: var(--muted); text-decoration: none; margin-bottom: 14px; }
.back:hover { color: var(--g1); }
.acct { display: grid; gap: 14px; align-items: start; }
.acct > .card, .acct aside > .card { overflow: hidden; }
@media (min-width: 900px) {
  .acct { grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: 18px; }
  .acct aside { position: sticky; top: 16px; }
}
.profile { display: flex; gap: 14px; align-items: center; padding: 18px; }
.profile .avatar { width: 52px; height: 52px; font-size: 22px; border-radius: 14px; }
.pname { font-weight: 600; }
.form h2 { margin: 0 0 2px; font-size: 16px; }
.acct .actions { margin-top: 14px; }

.btn {
  font: inherit; font-size: 15px; font-weight: 600; border: 1px solid var(--line-strong); background: var(--surface); color: var(--text);
  border-radius: 10px; padding: 11px 16px; cursor: pointer; text-decoration: none; display: inline-flex; justify-content: center;
  transition: border-color .15s;
}
.btn:hover { border-color: var(--g2); }
.btn.primary { background: linear-gradient(100deg, var(--g1), var(--g2)); border-color: transparent; color: #07080c; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .5; }
.link { font: inherit; font-size: 14px; background: none; border: 0; color: var(--accent); padding: 6px 4px; cursor: pointer; }
.link.danger { color: var(--danger); }
.actions { display: grid; gap: 10px; margin-top: 22px; }

.login { width: min(420px, 100%); margin: 12vh auto 0; overflow: hidden; }
.lb { padding: 22px 22px 24px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.lb h1 { margin: 6px 0 0; font-size: 34px; font-weight: 800; line-height: 1.2; }
.lb .prompt { margin: -4px 0 6px; }
.form { padding: 18px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); min-width: 0; }
label.check { display: flex; align-items: center; gap: 8px; }
input:not([type=checkbox]) {
  font: inherit; font-size: 16px; /* under 16px iOS zooms in on focus */ color: var(--text);
  width: 100%; min-width: 0; /* Firefox gives inputs a wide default width that pushes the card open */
  background: color-mix(in srgb, var(--bg) 70%, transparent); border: 1px solid var(--line-strong); border-radius: 10px; padding: 10px 12px;
}
input:focus { outline: none; border-color: var(--g1); box-shadow: 0 0 0 3px color-mix(in srgb, var(--g1) 22%, transparent); }
.btn:focus-visible, a:focus-visible { outline: 2px solid var(--g1); outline-offset: 2px; }
.err { color: var(--danger); font-size: 14px; min-height: 1.2em; }

.user-row { display: flex; align-items: center; gap: 12px; padding: 12px 16px; }
.user-row .avatar { width: 34px; height: 34px; font-size: 14px; }
.user-row + .user-row { border-top: 1px dashed var(--line-strong); }
.user-row > div { flex: 1; min-width: 0; }
.user-row .tag { margin-left: 4px; }
.toast { position: fixed; left: 50%; bottom: calc(40px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%);
  background: var(--surface-solid); color: var(--text); border: 1px solid var(--line-strong); padding: 8px 14px; border-radius: 10px; font-size: 14px; }

@media (max-width: 640px) {
  .kpis { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .kv { font-size: 28px; }
  .hero { padding: 24px 0 20px; }
  .pill { display: none; }
}
@media (prefers-reduced-motion: reduce) { .caret, .pill i, .live i { animation: none; } .btn, .mod, .dots i { transition: none; } }