/* ============================================================
   知の航路 | THE VOYAGE OF KNOWLEDGE
   Design system — 6 astronomical themes
   galaxy / starriver / aurora / night / moon / voyage(chart)
   ============================================================ */

:root {
  --paper: #fbf8f1;
  --paper-2: #f4efe4;
  --ink: #16202f;
  --ink-2: #3d4a5c;
  --ink-3: #76808f;
  --line: #ddd5c4;
  --line-2: #ece6d8;
  --brass: #a8853f;
  --brass-2: #c9a65e;
  --indigo: #1d2c47;
  --sea: #2f6f7e;
  --ok: #2f7d5d;
  --warn: #b4692b;
  --bad: #a63d3d;

  --surface: #ffffff;
  --surface-2: rgba(255, 255, 255, .68);
  --surface-3: rgba(255, 255, 255, .42);
  --chip-bg: #f4efe4;
  --input-bg: #ffffff;
  --sel-bg: #f4f7fb;

  --s-jp: #e0806a;
  --s-math: #7ea8e8;
  --s-en: #63c8ad;
  --s-sci: #b394e8;
  --s-geo: #e0bd6a;

  --shadow-1: 0 1px 2px rgba(22, 32, 47, .05), 0 6px 18px rgba(22, 32, 47, .05);
  --shadow-2: 0 2px 6px rgba(22, 32, 47, .07), 0 18px 44px rgba(22, 32, 47, .09);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;

  --font-serif: 'Noto Serif JP', 'Hiragino Mincho ProN', serif;
  --font-sans: 'Noto Sans JP', -apple-system, 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --glass-blur: 20px;
}

/* ------------------------------------------------------------ THEME: galaxy */
html[data-theme='galaxy'] {
  --paper: #0a0f26;
  --paper-2: #111737;
  --ink: #eceaff;
  --ink-2: #b9b7dd;
  --ink-3: #8a87b4;
  --line: rgba(150, 140, 220, .26);
  --line-2: rgba(150, 140, 220, .14);
  --brass: #b9a6ff;
  --brass-2: #d8ccff;
  --indigo: #4a3f8f;
  --sea: #9fc4ff;
  --ok: #6fe0b0;
  --warn: #ffc479;
  --bad: #ff9b9b;
  --surface: rgba(20, 22, 54, .58);
  --surface-2: rgba(30, 30, 72, .44);
  --surface-3: rgba(44, 42, 96, .3);
  --chip-bg: rgba(120, 106, 220, .18);
  --input-bg: rgba(10, 12, 34, .62);
  --sel-bg: rgba(120, 106, 220, .2);
  --s-jp: #ff9b86;
  --s-math: #8fb6ff;
  --s-en: #6fe0c4;
  --s-sci: #c3a0ff;
  --s-geo: #ffd481;
  --shadow-1: 0 2px 10px rgba(0, 0, 0, .3);
  --shadow-2: 0 10px 40px rgba(0, 0, 0, .45);
  --sky-a: #05070f; --sky-b: #150f33; --sky-c: #2a1b52;
}

/* -------------------------------------------------------- THEME: starriver */
html[data-theme='starriver'] {
  --paper: #050a18;
  --paper-2: #0a1428;
  --ink: #e6f3ff;
  --ink-2: #a9c6dd;
  --ink-3: #7d99b3;
  --line: rgba(126, 187, 224, .24);
  --line-2: rgba(126, 187, 224, .13);
  --brass: #8fdcff;
  --brass-2: #c4f0ff;
  --indigo: #1b4b70;
  --sea: #8fdcff;
  --ok: #7fe8c0;
  --warn: #ffce85;
  --bad: #ffa1a1;
  --surface: rgba(9, 20, 39, .58);
  --surface-2: rgba(14, 32, 58, .44);
  --surface-3: rgba(22, 48, 80, .3);
  --chip-bg: rgba(80, 160, 210, .18);
  --input-bg: rgba(4, 12, 26, .66);
  --sel-bg: rgba(80, 170, 220, .18);
  --s-jp: #ff9d88;
  --s-math: #8fc8ff;
  --s-en: #6fe6cc;
  --s-sci: #b9a6ff;
  --s-geo: #ffd98a;
  --shadow-1: 0 2px 10px rgba(0, 0, 0, .32);
  --shadow-2: 0 10px 40px rgba(0, 0, 0, .48);
  --sky-a: #02060f; --sky-b: #071a30; --sky-c: #0f3352;
}

/* ------------------------------------------------------------ THEME: aurora */
html[data-theme='aurora'] {
  --paper: #04121a;
  --paper-2: #08202b;
  --ink: #e6fff8;
  --ink-2: #a9d8cd;
  --ink-3: #77a79c;
  --line: rgba(120, 226, 200, .22);
  --line-2: rgba(120, 226, 200, .12);
  --brass: #7ef2c8;
  --brass-2: #b6ffe6;
  --indigo: #12615c;
  --sea: #8ef0e0;
  --ok: #8cf0b8;
  --warn: #ffd48a;
  --bad: #ffa8a8;
  --surface: rgba(7, 28, 35, .56);
  --surface-2: rgba(10, 40, 48, .44);
  --surface-3: rgba(16, 56, 64, .3);
  --chip-bg: rgba(84, 200, 176, .16);
  --input-bg: rgba(3, 18, 24, .64);
  --sel-bg: rgba(84, 210, 186, .18);
  --s-jp: #ffa08a;
  --s-math: #90c8ff;
  --s-en: #7ef2c8;
  --s-sci: #b6a4ff;
  --s-geo: #ffd98a;
  --shadow-1: 0 2px 10px rgba(0, 0, 0, .32);
  --shadow-2: 0 10px 40px rgba(0, 0, 0, .46);
  --sky-a: #02100f; --sky-b: #041d26; --sky-c: #06313b;
}

/* ------------------------------------------------------------- THEME: night */
html[data-theme='night'] {
  --paper: #070c1c;
  --paper-2: #0d1428;
  --ink: #eef3ff;
  --ink-2: #b4c1d9;
  --ink-3: #8492ab;
  --line: rgba(150, 175, 220, .22);
  --line-2: rgba(150, 175, 220, .12);
  --brass: #cfe0ff;
  --brass-2: #eaf1ff;
  --indigo: #23375c;
  --sea: #a8c8ff;
  --ok: #86e2bc;
  --warn: #ffd08a;
  --bad: #ffa6a6;
  --surface: rgba(12, 20, 38, .58);
  --surface-2: rgba(18, 28, 52, .44);
  --surface-3: rgba(26, 42, 70, .3);
  --chip-bg: rgba(120, 150, 210, .16);
  --input-bg: rgba(6, 11, 24, .66);
  --sel-bg: rgba(120, 150, 220, .18);
  --s-jp: #ffa08a;
  --s-math: #8fb6ff;
  --s-en: #74e0c2;
  --s-sci: #bca6ff;
  --s-geo: #ffd98a;
  --shadow-1: 0 2px 10px rgba(0, 0, 0, .3);
  --shadow-2: 0 10px 40px rgba(0, 0, 0, .45);
  --sky-a: #04070f; --sky-b: #0a1326; --sky-c: #122138;
}

/* -------------------------------------------------------------- THEME: moon */
html[data-theme='moon'] {
  --paper: #0b1020;
  --paper-2: #141b2f;
  --ink: #f2f6ff;
  --ink-2: #c0cbe2;
  --ink-3: #8d9ab4;
  --line: rgba(170, 190, 230, .24);
  --line-2: rgba(170, 190, 230, .13);
  --brass: #e8eeff;
  --brass-2: #ffffff;
  --indigo: #2a3a58;
  --sea: #bcd4ff;
  --ok: #8fe4c4;
  --warn: #ffd79a;
  --bad: #ffabab;
  --surface: rgba(17, 25, 42, .56);
  --surface-2: rgba(26, 36, 58, .44);
  --surface-3: rgba(36, 50, 76, .3);
  --chip-bg: rgba(150, 175, 220, .16);
  --input-bg: rgba(8, 13, 26, .68);
  --sel-bg: rgba(150, 175, 230, .18);
  --s-jp: #ffab97;
  --s-math: #9cc4ff;
  --s-en: #7de8cb;
  --s-sci: #c4aeff;
  --s-geo: #ffdf9e;
  --shadow-1: 0 2px 10px rgba(0, 0, 0, .3);
  --shadow-2: 0 10px 40px rgba(0, 0, 0, .46);
  --sky-a: #060a14; --sky-b: #0e1729; --sky-c: #1d2b45;
}

/* ------------------------------------------------------------ THEME: voyage */
html[data-theme='voyage'] {
  --paper: #fbf8f1;
  --paper-2: #f4efe4;
  --ink: #16202f;
  --ink-2: #3d4a5c;
  --ink-3: #76808f;
  --line: #ddd5c4;
  --line-2: #ece6d8;
  --brass: #a8853f;
  --brass-2: #c9a65e;
  --indigo: #1d2c47;
  --sea: #2f6f7e;
  --ok: #2f7d5d;
  --warn: #b4692b;
  --bad: #a63d3d;
  --surface: #ffffff;
  --surface-2: rgba(255, 255, 255, .68);
  --surface-3: rgba(255, 255, 255, .42);
  --chip-bg: #f4efe4;
  --input-bg: #ffffff;
  --sel-bg: #f4f7fb;
  --s-jp: #b8503c;
  --s-math: #2f5f9e;
  --s-en: #217a63;
  --s-sci: #6d4d9c;
  --s-geo: #9a7420;
  --shadow-1: 0 1px 2px rgba(22, 32, 47, .05), 0 6px 18px rgba(22, 32, 47, .05);
  --shadow-2: 0 2px 6px rgba(22, 32, 47, .07), 0 18px 44px rgba(22, 32, 47, .09);
  --sky-a: #fbf8f1; --sky-b: #f7f2e6; --sky-c: #f1ead9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background-color: var(--paper);
  /* 背景は static/cosmos.css の .cosmos が担当する（テーマ別の空） */
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'palt' 1;
  line-height: 1.85;
  min-height: 100vh;
}
html[data-theme='voyage'] body {
  background-image: none;
}

h1, h2, h3, h4, .serif { font-family: var(--font-serif); font-weight: 600; letter-spacing: .02em; line-height: 1.5; }
p { margin: 0 0 .85em; }
a { color: var(--sea); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; }
::selection { background: var(--brass); color: var(--paper); }

.mono { font-family: var(--font-mono); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; }

/* ---------------- cosmos backdrop ----------------
   天体の演出は static/cosmos.css に分離した。
   テーマごとの表示切替は html[data-theme="..."] で行うため、
   JavaScript や canvas が無効でも必ず描画される。 */

/* ---------------- shell ---------------- */
.app { position: relative; z-index: 1; display: grid; grid-template-columns: 268px 1fr; min-height: 100vh; }

.sidebar {
  position: sticky; top: 0; align-self: start; height: 100vh;
  display: flex; flex-direction: column;
  background: linear-gradient(180deg, rgba(6, 10, 26, .94), rgba(12, 18, 42, .9));
  color: #dfe4f2; padding: 26px 20px 18px; overflow-y: auto;
  border-right: 1px solid var(--line);
  backdrop-filter: blur(var(--glass-blur));
}
html[data-theme='voyage'] .sidebar {
  background: linear-gradient(180deg, #101a2b 0%, #16233a 60%, #1a2a44 100%);
  color: #e8e2d4;
}
.brand { padding: 0 6px 20px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.brand-mark { display: flex; align-items: center; gap: 10px; }
.brand-glyph { width: 34px; height: 34px; flex: none; color: var(--brass-2); }
.brand-title { font-family: var(--font-serif); font-size: 1.24rem; color: var(--ink); letter-spacing: .12em; }
html[data-theme='voyage'] .brand-title { color: #f6f1e4; }
.brand-sub { font-family: var(--font-mono); font-size: .58rem; letter-spacing: .3em; color: var(--brass); margin-top: 4px; }
.brand-note { font-size: .7rem; color: var(--ink-3); margin-top: 10px; line-height: 1.6; letter-spacing: .04em; }

.nav-group { margin-bottom: 20px; }
.nav-group-label { font-family: var(--font-mono); font-size: .6rem; letter-spacing: .26em; color: var(--ink-3); padding: 0 8px; margin-bottom: 8px; }
.nav-item {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 9px 10px; border: 0; border-radius: var(--r-sm);
  background: transparent; color: var(--ink-2); font-size: .86rem; text-align: left;
  cursor: pointer; transition: background .16s, color .16s; letter-spacing: .03em;
}
.nav-item:hover { background: var(--surface-3); color: initial; }
.nav-item:hover, .nav-item.active { color: var(--ink); }
.nav-item.active { background: var(--surface-2); box-shadow: inset 2px 0 0 var(--brass-2); }
.nav-item .num { font-family: var(--font-mono); font-size: .62rem; color: var(--brass); min-width: 16px; }

.sidebar-foot { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line-2); }
.theme-quick { display: flex; gap: 5px; flex-wrap: wrap; padding: 0 4px 10px; }
.theme-dot {
  width: 20px; height: 20px; border-radius: 50%; cursor: pointer; border: 1px solid var(--line);
  padding: 0; position: relative; transition: transform .15s, box-shadow .15s;
}
.theme-dot:hover { transform: scale(1.14); }
.theme-dot.on { box-shadow: 0 0 0 2px var(--paper), 0 0 0 3px var(--brass-2); }
.coverage-mini { padding: 10px 8px 0; }
.coverage-mini-row { display: flex; justify-content: space-between; font-size: .68rem; color: var(--ink-3); margin-bottom: 6px; }
.bar { height: 4px; background: var(--line-2); border-radius: 99px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--brass), var(--brass-2)); }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px 34px; background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(var(--glass-blur)); border-bottom: 1px solid var(--line);
}
.crumbs { font-size: .72rem; color: var(--ink-3); letter-spacing: .06em; }
.crumbs b { color: var(--ink-2); font-weight: 500; }
.topbar-actions { display: flex; gap: 8px; align-items: center; }
.view { padding: 34px 34px 56px; max-width: 1180px; width: 100%; }
.site-foot {
  margin-top: auto; padding: 18px 34px 26px; display: flex; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; font-size: .62rem; color: var(--ink-3); border-top: 1px solid var(--line-2);
}

/* ---------------- primitives ---------------- */
.eyebrow { font-family: var(--font-mono); font-size: .62rem; letter-spacing: .3em; color: var(--brass); text-transform: uppercase; }
.rule { height: 1px; background: var(--line); border: 0; margin: 18px 0; }
.rule-fancy { display: flex; align-items: center; gap: 12px; margin: 26px 0; color: var(--brass); }
.rule-fancy::before, .rule-fancy::after { content: ''; height: 1px; background: var(--line); flex: 1; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 18px; border-radius: var(--r-sm); border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); font-size: .84rem; cursor: pointer;
  transition: transform .12s, box-shadow .16s, background .16s, border-color .16s;
  letter-spacing: .04em;
}
.btn:hover { box-shadow: var(--shadow-1); border-color: var(--brass-2); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-primary { background: linear-gradient(180deg, color-mix(in srgb, var(--indigo) 86%, white 14%), var(--indigo)); color: #fbf7ea; border-color: var(--indigo); }
.btn-primary:hover { filter: brightness(1.14); }
.btn-brass { background: linear-gradient(180deg, var(--brass-2), var(--brass)); color: #1a1408; border-color: var(--brass); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 6px 12px; font-size: .76rem; }
.btn-block { width: 100%; }

.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px;
  border-radius: 99px; font-size: .7rem; letter-spacing: .04em;
  background: var(--chip-bg); color: var(--ink-2); border: 1px solid var(--line);
  white-space: nowrap;
}
.chip-ok { background: color-mix(in srgb, var(--ok) 16%, transparent); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 32%, transparent); }
.chip-warn { background: color-mix(in srgb, var(--warn) 16%, transparent); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 32%, transparent); }
.chip-bad { background: color-mix(in srgb, var(--bad) 16%, transparent); color: var(--bad); border-color: color-mix(in srgb, var(--bad) 32%, transparent); }
.chip-gold { background: color-mix(in srgb, var(--brass) 18%, transparent); color: var(--brass); border-color: color-mix(in srgb, var(--brass) 34%, transparent); }
.chip-sea { background: color-mix(in srgb, var(--sea) 14%, transparent); color: var(--sea); border-color: color-mix(in srgb, var(--sea) 30%, transparent); }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--shadow-1); padding: 22px 24px;
  backdrop-filter: blur(var(--glass-blur));
}
.card-quiet { background: var(--surface-2); box-shadow: none; }
.card-title { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.card-title h3 { margin: 0; font-size: 1.06rem; }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------------- hero ---------------- */
.hero {
  position: relative; overflow: hidden; border-radius: var(--r-lg);
  background:
    radial-gradient(900px 320px at 82% -10%, color-mix(in srgb, var(--brass) 22%, transparent), transparent 62%),
    linear-gradient(135deg, color-mix(in srgb, var(--paper-2) 88%, #000 12%) 0%, var(--paper-2) 50%, color-mix(in srgb, var(--indigo) 34%, var(--paper-2)) 100%);
  color: var(--ink);
  padding: 46px 46px 40px; box-shadow: var(--shadow-2);
  border: 1px solid var(--line);
}
/* 暗色テーマではヒーローを半透明ガラスにして、背後の月・星雲を透かす */
html.is-dark .hero {
  background:
    radial-gradient(900px 320px at 82% -10%, color-mix(in srgb, var(--brass) 16%, transparent), transparent 64%),
    linear-gradient(135deg, color-mix(in srgb, var(--paper-2) 62%, transparent) 0%, color-mix(in srgb, var(--paper-2) 44%, transparent) 52%, color-mix(in srgb, var(--indigo) 34%, transparent) 100%);
  backdrop-filter: blur(3px) saturate(1.06);
}
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, color-mix(in srgb, var(--brass) 7%, transparent) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--brass) 7%, transparent) 0 1px, transparent 1px 46px);
  mask-image: radial-gradient(120% 90% at 70% 20%, #000 20%, transparent 78%);
}
.hero h1 { font-size: clamp(1.9rem, 3.4vw, 2.85rem); margin: 10px 0 6px; color: var(--ink); letter-spacing: .04em; }
.hero-en { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .42em; color: var(--brass); }
.hero-lead { max-width: 640px; color: var(--ink-2); font-size: .92rem; margin-top: 14px; line-height: 1.95; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 30px; position: relative; z-index: 2; }
.hero-stat .v { font-family: var(--font-serif); font-size: 1.72rem; color: var(--ink); line-height: 1.2; }
.hero-stat .k { font-family: var(--font-mono); font-size: .58rem; letter-spacing: .22em; color: var(--ink-3); margin-top: 4px; }
.compass { position: absolute; right: 34px; top: 30px; width: 128px; height: 128px; opacity: .3; color: var(--brass); }

/* ---------------- subject cards ---------------- */
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(212px, 1fr)); gap: 14px; }
.subject-card {
  position: relative; text-align: left; cursor: pointer; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 18px 18px 16px; transition: transform .16s, box-shadow .18s, border-color .18s;
  color: var(--ink); backdrop-filter: blur(var(--glass-blur));
}
.subject-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); border-color: var(--brass-2); }
.subject-card .bar-accent { position: absolute; left: 0; top: 0; bottom: 0; width: 3px; }
.subject-card h4 { margin: 0 0 2px; font-size: 1.1rem; }
.subject-card .en { font-family: var(--font-mono); font-size: .56rem; letter-spacing: .22em; color: var(--ink-3); }
.subject-card .meta { display: flex; gap: 12px; margin-top: 14px; font-size: .72rem; color: var(--ink-3); }
.subject-card .meta b { color: var(--ink); font-weight: 600; font-family: var(--font-mono); }

/* ---------------- curriculum ---------------- */
.tabs { display: flex; flex-wrap: wrap; gap: 6px; border-bottom: 1px solid var(--line); margin-bottom: 22px; }
.tab {
  border: 0; background: transparent; padding: 10px 14px; cursor: pointer;
  font-size: .86rem; color: var(--ink-3); border-bottom: 2px solid transparent; margin-bottom: -1px;
  letter-spacing: .05em;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--ink); border-bottom-color: var(--brass); font-weight: 600; }

.course-block { margin-bottom: 30px; }
.course-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.course-head h3 { margin: 0; font-size: 1.18rem; }
.course-desc { font-size: .78rem; color: var(--ink-3); }

.unit {
  border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface);
  margin-bottom: 10px; overflow: hidden; backdrop-filter: blur(var(--glass-blur));
}
.unit-head {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  padding: 15px 18px; background: transparent; border: 0; cursor: pointer; color: var(--ink);
}
.unit-head:hover { background: var(--surface-3); }
.unit-head .chev { margin-left: auto; transition: transform .18s; color: var(--ink-3); }
.unit.open .chev { transform: rotate(90deg); }
.unit-name { font-family: var(--font-serif); font-size: 1rem; }
.unit-sub { font-size: .72rem; color: var(--ink-3); }
.unit-body { display: none; padding: 0 18px 18px; border-top: 1px solid var(--line-2); }
.unit.open .unit-body { display: block; }
.unit-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; padding: 16px 0; }
.unit-meta h5 { margin: 0 0 5px; font-family: var(--font-mono); font-size: .58rem; letter-spacing: .2em; color: var(--brass); text-transform: uppercase; }
.unit-meta p { margin: 0; font-size: .8rem; color: var(--ink-2); line-height: 1.8; }
.tag-row { display: flex; flex-wrap: wrap; gap: 5px; }

.pattern-row {
  display: flex; align-items: center; gap: 12px; padding: 11px 0;
  border-top: 1px dashed var(--line-2);
}
.pattern-row:first-of-type { border-top: 1px solid var(--line); }
.pattern-main { flex: 1; min-width: 0; }
.pattern-name { font-size: .9rem; font-weight: 500; }
.pattern-desc { font-size: .74rem; color: var(--ink-3); line-height: 1.7; }
.pattern-count { font-family: var(--font-mono); font-size: .68rem; color: var(--ink-3); white-space: nowrap; }
.pattern-count b { color: var(--ink); font-size: .82rem; }

/* ---------------- practice ---------------- */
.practice-grid { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 20px; align-items: start; }
.q-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-1); overflow: hidden; backdrop-filter: blur(var(--glass-blur)); }
.q-head { padding: 18px 26px; border-bottom: 1px solid var(--line-2); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; background: var(--surface-3); }
.q-id { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .16em; color: var(--brass); }
.q-body { padding: 26px; }
.q-prompt { font-size: .98rem; line-height: 2.05; }
.passage {
  background: var(--surface-2); border-left: 3px solid var(--brass-2); border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 16px 18px; margin: 18px 0; font-family: var(--font-serif); font-size: .94rem; line-height: 2.1;
}
.data-table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: .82rem; }
.data-table caption { caption-side: top; text-align: left; font-size: .72rem; color: var(--ink-3); padding-bottom: 6px; }
.data-table th, .data-table td { border: 1px solid var(--line); padding: 7px 12px; text-align: left; }
.data-table th { background: var(--surface-2); font-weight: 600; font-family: var(--font-mono); font-size: .68rem; letter-spacing: .06em; }

.choices { display: grid; gap: 8px; margin: 16px 0; }
.choice {
  display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; cursor: pointer;
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--input-bg); color: var(--ink);
  transition: border-color .15s, background .15s;
  text-align: left; width: 100%; font-size: .9rem; line-height: 1.8;
}
.choice:hover { border-color: var(--brass-2); background: var(--surface-3); }
.choice.sel { border-color: var(--brass-2); background: var(--sel-bg); box-shadow: inset 0 0 0 1px var(--brass-2); }
.choice .lab { font-family: var(--font-mono); font-size: .72rem; color: var(--brass); flex: none; padding-top: 2px; }

.reasoning-block { margin-top: 22px; }
.reasoning-row { margin-bottom: 12px; }
.reasoning-row label { display: block; font-size: .74rem; color: var(--ink-2); margin-bottom: 4px; letter-spacing: .04em; }
.reasoning-row label .hint-tag { color: var(--ink-3); font-size: .68rem; margin-left: 6px; }
textarea, input[type='text'], select {
  width: 100%; font-family: inherit; font-size: .88rem; line-height: 1.85; color: var(--ink);
  border: 1px solid var(--line); border-radius: var(--r-sm); padding: 10px 12px; background: var(--input-bg);
  transition: border-color .15s, box-shadow .15s;
}
textarea:focus, input[type='text']:focus, select:focus { outline: none; border-color: var(--brass-2); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brass) 20%, transparent); }
textarea { resize: vertical; min-height: 62px; }
.counter { font-family: var(--font-mono); font-size: .64rem; color: var(--ink-3); text-align: right; margin-top: 3px; }

.q-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line-2); }

/* result */
.result { margin-top: 22px; border-top: 3px double var(--line); padding-top: 22px; }
.score-band { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.score-ring { position: relative; width: 104px; height: 104px; flex: none; }
.score-ring svg { transform: rotate(-90deg); }
.score-ring .val { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.score-ring .val b { font-family: var(--font-serif); font-size: 1.5rem; line-height: 1; }
.score-ring .val span { font-family: var(--font-mono); font-size: .56rem; color: var(--ink-3); letter-spacing: .16em; }
.verdict { font-family: var(--font-serif); font-size: 1.16rem; }
.verdict small { display: block; font-family: var(--font-sans); font-size: .76rem; color: var(--ink-3); margin-top: 4px; }

.rubric-table { width: 100%; border-collapse: collapse; font-size: .8rem; margin-top: 8px; }
.rubric-table th { text-align: left; font-family: var(--font-mono); font-size: .62rem; letter-spacing: .14em; color: var(--ink-3); border-bottom: 1px solid var(--line); padding: 8px 10px; font-weight: 500; }
.rubric-table td { border-bottom: 1px solid var(--line-2); padding: 10px; vertical-align: top; }
.rubric-table .pts { font-family: var(--font-mono); white-space: nowrap; }
.rubric-table .full { color: var(--ok); }
.rubric-table .part { color: var(--warn); }
.rubric-table .zero { color: var(--bad); }

.feedback-block { margin-top: 16px; padding: 14px 16px; border-radius: var(--r-sm); background: var(--surface-2); border: 1px solid var(--line-2); }
.feedback-block h5 { margin: 0 0 8px; font-size: .76rem; letter-spacing: .1em; font-family: var(--font-mono); text-transform: uppercase; color: var(--ink-2); }
.feedback-block ul { margin: 0; padding-left: 18px; font-size: .82rem; line-height: 1.9; }
.feedback-block li { margin-bottom: 3px; }
.feedback-block.bad { background: color-mix(in srgb, var(--bad) 9%, var(--surface)); border-color: color-mix(in srgb, var(--bad) 24%, transparent); }
.feedback-block.good { background: color-mix(in srgb, var(--ok) 9%, var(--surface)); border-color: color-mix(in srgb, var(--ok) 24%, transparent); }
.feedback-block.gold { background: color-mix(in srgb, var(--brass) 11%, var(--surface)); border-color: color-mix(in srgb, var(--brass) 28%, transparent); }

.solution-section { margin-bottom: 16px; }
.solution-section h5 { margin: 0 0 5px; font-family: var(--font-serif); font-size: .94rem; color: var(--ink); }
.solution-section h5::before { content: '§ '; color: var(--brass); font-family: var(--font-mono); font-size: .8rem; }
.solution-section p { font-size: .86rem; line-height: 1.95; margin: 0; color: var(--ink-2); }

/* sidebar of practice */
.side-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 16px 18px; margin-bottom: 14px; backdrop-filter: blur(var(--glass-blur)); }
.side-card h5 { margin: 0 0 10px; font-family: var(--font-mono); font-size: .6rem; letter-spacing: .2em; color: var(--brass); text-transform: uppercase; }
.hint-list { display: grid; gap: 8px; }
.hint-item { font-size: .8rem; line-height: 1.8; padding: 10px 12px; background: var(--surface-2); border-left: 2px solid var(--brass-2); border-radius: 0 var(--r-sm) var(--r-sm) 0; }
.hint-locked { font-size: .78rem; color: var(--ink-3); text-align: center; padding: 8px; border: 1px dashed var(--line); border-radius: var(--r-sm); }

/* ---------------- settings ---------------- */
.field { margin-bottom: 20px; }
.field > label { display: block; font-size: .8rem; font-weight: 600; margin-bottom: 4px; }
.field .desc { font-size: .74rem; color: var(--ink-3); margin-bottom: 8px; line-height: 1.7; }
.segmented { display: flex; flex-wrap: wrap; gap: 6px; }
.segmented button {
  padding: 7px 13px; border: 1px solid var(--line); background: var(--input-bg); border-radius: 99px;
  font-size: .78rem; cursor: pointer; color: var(--ink-2); transition: all .15s;
}
.segmented button:hover { border-color: var(--brass-2); }
.segmented button.on { background: var(--indigo); color: #fbf7ea; border-color: var(--indigo); }

.toggle { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: .84rem; }
.toggle input { appearance: none; width: 38px; height: 21px; border-radius: 99px; background: var(--line); position: relative; cursor: pointer; transition: background .18s; }
.toggle input::after { content: ''; position: absolute; top: 2px; left: 2px; width: 17px; height: 17px; border-radius: 50%; background: #fff; transition: transform .18s; box-shadow: 0 1px 2px rgba(0, 0, 0, .2); }
.toggle input:checked { background: var(--indigo); }
.toggle input:checked::after { transform: translateX(17px); }

/* ---------------- theme gallery ---------------- */
.theme-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(208px, 1fr)); gap: 12px; }
.theme-card {
  position: relative; cursor: pointer; text-align: left; padding: 0; overflow: hidden;
  border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface);
  transition: transform .16s, box-shadow .16s, border-color .16s; color: var(--ink);
}
.theme-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.theme-card.on { border-color: var(--brass-2); box-shadow: 0 0 0 2px color-mix(in srgb, var(--brass) 34%, transparent); }
/* テーマカードのプレビュー: 実際の演出を縮小再現する */
.theme-preview { height: 86px; position: relative; overflow: hidden; background: var(--pv-a); }
.theme-preview .pv-sky,
.theme-preview .pv-fx,
.theme-preview .pv-moon,
.theme-preview .pv-rose,
.theme-preview .pv-meteor { position: absolute; pointer-events: none; }
.theme-preview .pv-sky {
  inset: 0;
  background: radial-gradient(120% 110% at 70% -14%, var(--pv-b) 0%, var(--pv-a) 66%, var(--pv-a) 100%);
}
.theme-preview .pv-fx { inset: 0; }

/* 銀河: 紫の星雲 + 流星 */
.pv-galaxy .pv-fx {
  background:
    radial-gradient(46% 62% at 26% 30%, rgba(150, 92, 235, .62), transparent 70%),
    radial-gradient(40% 56% at 74% 20%, rgba(72, 118, 246, .5), transparent 72%),
    radial-gradient(52% 58% at 58% 88%, rgba(196, 86, 214, .42), transparent 72%);
  filter: blur(7px);
}
.pv-galaxy .pv-meteor {
  top: 16px; left: 22%; width: 44px; height: 1.4px; border-radius: 99px;
  background: linear-gradient(90deg, transparent, #fff 88%);
  box-shadow: 0 0 5px 1px rgba(210, 226, 255, .8);
  transform: rotate(26deg);
}
/* 星河: 斜めの天の川の帯＋濃い星 */
.pv-starriver .pv-fx {
  background:
    linear-gradient(108deg, transparent 26%, rgba(200, 232, 255, .26) 44%, rgba(255, 255, 255, .4) 52%, rgba(180, 214, 255, .22) 62%, transparent 78%);
}
/* オーロラ: 3枚のカーテン */
.pv-aurora .pv-fx {
  background:
    linear-gradient(104deg, transparent 6%, rgba(126, 255, 214, .5) 26%, transparent 44%),
    linear-gradient(76deg, transparent 30%, rgba(96, 220, 255, .44) 52%, transparent 72%),
    linear-gradient(96deg, transparent 56%, rgba(186, 160, 255, .44) 76%, transparent 92%);
  filter: blur(6px);
}
/* 夜空: 静かな星だけ */
.pv-night .pv-fx {
  background:
    radial-gradient(1.5px 1.5px at 14% 26%, #fff, transparent),
    radial-gradient(1.2px 1.2px at 38% 62%, rgba(255,255,255,.9), transparent),
    radial-gradient(1.7px 1.7px at 58% 22%, #fff, transparent),
    radial-gradient(1.1px 1.1px at 76% 54%, rgba(255,255,255,.85), transparent),
    radial-gradient(1.4px 1.4px at 28% 82%, rgba(255,255,255,.8), transparent),
    radial-gradient(1.2px 1.2px at 88% 78%, rgba(255,255,255,.75), transparent);
}
/* 月光: クレーター付きの月 */
.pv-moon .pv-moon {
  top: 10px; right: 14px; width: 30px; height: 30px; border-radius: 50%;
  background:
    radial-gradient(circle at 62% 30%, rgba(126,146,188,.6) 0 12%, transparent 14%),
    radial-gradient(circle at 38% 62%, rgba(118,138,180,.5) 0 16%, transparent 18%),
    radial-gradient(circle at 34% 28%, #fff, #e6eeff 46%, #b3c6e8 100%);
  box-shadow: 0 0 18px 5px rgba(214, 230, 255, .5), 0 0 40px 14px rgba(150, 182, 244, .3);
}
/* 海図: 羊皮紙＋羅針盤 */
.pv-voyage .pv-sky {
  background:
    linear-gradient(rgba(146, 112, 52, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(146, 112, 52, .16) 1px, transparent 1px),
    radial-gradient(120% 110% at 78% -10%, #fdfbf5, #f2ead8 100%);
  background-size: 14px 14px, 14px 14px, auto;
}
.pv-voyage .pv-rose {
  right: 12px; bottom: 8px; width: 40px; height: 40px; border-radius: 50%; opacity: .55;
  background:
    repeating-conic-gradient(from 0deg, rgba(150, 116, 54, .4) 0deg 2deg, transparent 2deg 30deg),
    radial-gradient(circle, transparent 0 42%, rgba(150, 116, 54, .45) 43% 46%, transparent 47%);
}
.theme-meta { padding: 10px 13px 12px; }
.theme-meta b { display: block; font-family: var(--font-serif); font-size: .92rem; }
.theme-meta span { font-family: var(--font-mono); font-size: .54rem; letter-spacing: .2em; color: var(--ink-3); }
.theme-meta em { display: block; font-style: normal; font-size: .7rem; color: var(--ink-3); margin-top: 4px; line-height: 1.6; }
.theme-check { position: absolute; top: 8px; right: 8px; width: 18px; height: 18px; border-radius: 50%; background: var(--brass-2); color: #10121f; display: none; place-content: center; font-size: .66rem; font-weight: 700; }
.theme-card.on .theme-check { display: grid; }

/* ---------------- history ---------------- */
.stat-tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md); padding: 16px 18px; backdrop-filter: blur(var(--glass-blur)); }
.stat-tile .k { font-family: var(--font-mono); font-size: .58rem; letter-spacing: .18em; color: var(--ink-3); text-transform: uppercase; }
.stat-tile .v { font-family: var(--font-serif); font-size: 1.7rem; line-height: 1.3; margin-top: 4px; }
.stat-tile .v small { font-size: .72rem; font-family: var(--font-sans); color: var(--ink-3); }

.hist-row {
  display: grid; grid-template-columns: 88px 1fr auto; gap: 14px; align-items: center;
  padding: 12px 4px; border-bottom: 1px solid var(--line-2); font-size: .82rem;
}
.hist-row:last-child { border-bottom: 0; }
.hist-score { font-family: var(--font-mono); font-size: .78rem; text-align: center; padding: 4px 0; border-radius: var(--r-sm); }
.hist-meta { font-size: .7rem; color: var(--ink-3); }

.spark { display: flex; align-items: flex-end; gap: 3px; height: 48px; }
.spark span { flex: 1; background: linear-gradient(180deg, var(--brass-2), var(--brass)); border-radius: 2px 2px 0 0; min-height: 2px; }

/* ---------------- misc ---------------- */
.notice { display: flex; gap: 12px; padding: 14px 16px; border-radius: var(--r-sm); font-size: .8rem; line-height: 1.8; border: 1px solid; }
.notice-warn { background: color-mix(in srgb, var(--warn) 10%, var(--surface)); border-color: color-mix(in srgb, var(--warn) 30%, transparent); color: var(--warn); }
.notice-info { background: color-mix(in srgb, var(--sea) 10%, var(--surface)); border-color: color-mix(in srgb, var(--sea) 28%, transparent); color: var(--sea); }
.notice-bad { background: color-mix(in srgb, var(--bad) 10%, var(--surface)); border-color: color-mix(in srgb, var(--bad) 30%, transparent); color: var(--bad); }
.notice .ico { flex: none; font-family: var(--font-serif); font-weight: 700; }

.empty { text-align: center; padding: 48px 20px; color: var(--ink-3); font-size: .86rem; }
.empty .big { font-family: var(--font-serif); font-size: 1.2rem; color: var(--ink-2); margin-bottom: 6px; }

.skeleton { background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 50%, var(--surface-2) 75%); background-size: 200% 100%; animation: sk 1.3s infinite; border-radius: var(--r-sm); }
@keyframes sk { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--paper); padding: 11px 20px; border-radius: 99px;
  font-size: .82rem; box-shadow: var(--shadow-2); opacity: 0; transition: all .25s; z-index: 90; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.modal-back { position: fixed; inset: 0; background: rgba(4, 8, 20, .66); backdrop-filter: blur(4px); display: grid; place-items: center; padding: 24px; z-index: 80; }
.modal { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg); max-width: 580px; width: 100%; max-height: 86vh; overflow: auto; padding: 26px 28px; box-shadow: var(--shadow-2); }

.coverage-table { width: 100%; border-collapse: collapse; font-size: .8rem; }
.coverage-table th { background: var(--surface-2); text-align: left; padding: 9px 12px; font-family: var(--font-mono); font-size: .62rem; letter-spacing: .12em; color: var(--ink-2); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 1; }
.coverage-table td { padding: 8px 12px; border-bottom: 1px solid var(--line-2); }
.coverage-table tr:hover td { background: var(--surface-3); }
.coverage-table .num { font-family: var(--font-mono); text-align: right; }
.coverage-table .pat { font-family: var(--font-mono); font-size: .66rem; color: var(--ink-3); }

/* ---------------- math ---------------- */
.katex { font-size: 1.02em; }
.katex-display { margin: .7em 0; overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.math-display { display: block; margin: 10px 0; }
.math-fallback {
  font-family: var(--font-serif); padding: 1px 4px; border-radius: 4px;
  background: var(--surface-2); border: 1px dotted var(--line);
}
.q-quote { color: var(--ink-2); }

/* ---------------- drill ---------------- */
.drill-head { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; justify-content: space-between; }
.drill-progress { display: flex; align-items: center; gap: 10px; font-size: .76rem; color: var(--ink-3); }
.drill-progress .bar { width: 160px; }
.drill-item { border: 1px solid var(--line); border-radius: var(--r-md); margin-bottom: 10px; background: var(--surface); overflow: hidden; }
.drill-item.solved { border-color: color-mix(in srgb, var(--ok) 40%, transparent); }
.drill-q { padding: 14px 16px; }
.drill-answer { padding: 0 16px 14px; }

/* ---------------- responsive ---------------- */
@media (max-width: 1080px) {
  .practice-grid { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 880px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
  .nav-group { display: flex; flex-wrap: wrap; gap: 6px; }
  .nav-group-label { width: 100%; }
  .nav-item { width: auto; }
  .view { padding: 22px 18px 60px; }
  .topbar { padding: 10px 18px; }
  .hero { padding: 30px 22px; }
  .compass { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hist-row { grid-template-columns: 64px 1fr; }
  .site-foot { padding: 16px 18px 24px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
@media print {
  .cosmos, .sidebar, .topbar, .q-actions, .side-card, .site-foot { display: none !important; }
  .app { grid-template-columns: 1fr; }
  body { background: #fff; color: #111; }
  .q-card, .card { box-shadow: none; border-color: #ccc; background: #fff; }
}