/* ============================================================
   ACT Prep — Alina  |  shared stylesheet
   Enhanced ACT (2025+) prep site
   ============================================================ */

:root {
    --bg: #f6f7fb;
    --bg-2: #eceef6;
    --surface: #ffffff;
    --surface-2: #f2f4fa;
    --surface-3: #e7eaf4;
    --border: #d9dee9;
    --border-strong: #c2c9da;
    --text: #1c2030;
    --text-dim: #5b6478;
    --text-faint: #868fa3;

    --accent: #4f46e5;
    --accent-soft: #eef0fe;
    --accent-strong: #3f37c9;
    --accent-2: #0d9488;
    --accent-2-soft: #e2f5f2;
    --amber: #d97706;
    --amber-soft: #fdf1de;
    --good: #15803d;
    --good-soft: #e4f5ea;
    --bad: #c2314a;
    --bad-soft: #fdeaee;

    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 18px;
    --shadow: 0 1px 2px rgba(20, 25, 45, .06), 0 6px 18px rgba(20, 25, 45, .06);
    --shadow-lg: 0 4px 12px rgba(20, 25, 45, .10), 0 18px 40px rgba(20, 25, 45, .10);

    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-read: Georgia, "Iowan Old Style", "Times New Roman", serif;
    --font-mono: "SFMono-Regular", ui-monospace, Consolas, "Liberation Mono", Menlo, monospace;

    --maxw: 1180px;
}

html[data-theme="dark"] {
    --bg: #0f1219;
    --bg-2: #0a0d13;
    --surface: #171b25;
    --surface-2: #1e2331;
    --surface-3: #272d3d;
    --border: #2c3244;
    --border-strong: #3b4358;
    --text: #e7eaf3;
    --text-dim: #a3abc0;
    --text-faint: #7b849b;

    --accent: #8b87ff;
    --accent-soft: #22224a;
    --accent-strong: #a5a1ff;
    --accent-2: #2dd4bf;
    --accent-2-soft: #113a37;
    --amber: #fbbf24;
    --amber-soft: #3a2c0d;
    --good: #4ade80;
    --good-soft: #133026;
    --bad: #fb7185;
    --bad-soft: #3a1620;

    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 18px rgba(0, 0, 0, .35);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, .5), 0 18px 40px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

/* ---------- typography ---------- */
h1, h2, h3, h4, h5 { line-height: 1.25; font-weight: 700; color: var(--text); margin: 0 0 .5em; letter-spacing: -.015em; }
h1 { font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 1.1rem + 1.1vw, 1.8rem); margin-top: 2.2rem; }
h3 { font-size: 1.2rem; margin-top: 1.6rem; }
h4 { font-size: 1.02rem; margin-top: 1.2rem; }
p { margin: 0 0 1rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0 0 1rem; padding-left: 1.35rem; }
li { margin-bottom: .4rem; }
li > ul, li > ol { margin-top: .4rem; }
strong { font-weight: 650; }
code, kbd {
    font-family: var(--font-mono); font-size: .88em;
    background: var(--surface-3); padding: .12em .4em; border-radius: 5px;
}
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
small { font-size: .85em; color: var(--text-dim); }
.lede { font-size: 1.1rem; color: var(--text-dim); max-width: 68ch; }
.muted { color: var(--text-dim); }
.faint { color: var(--text-faint); }
.nowrap { white-space: nowrap; }
.center { text-align: center; }

/* ---------- skip link ---------- */
.skip {
    position: absolute; left: -9999px; top: 0; z-index: 200;
    background: var(--accent); color: #fff; padding: .7rem 1.1rem; border-radius: 0 0 var(--radius-sm) 0;
}
.skip:focus { left: 0; }

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
.wrap-narrow { max-width: 860px; margin: 0 auto; padding: 0 1.25rem; }
main { padding: 2rem 0 5rem; }
section { scroll-margin-top: 90px; }

/* ---------- top bar ---------- */
.topbar {
    position: sticky; top: 0; z-index: 100;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--border);
}
.topbar-inner {
    max-width: var(--maxw); margin: 0 auto; padding: .6rem 1.25rem;
    display: flex; align-items: center; gap: 1rem;
}
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 750; color: var(--text); font-size: 1rem; letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }
.brand-mark {
    width: 30px; height: 30px; border-radius: 8px; flex: 0 0 auto;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: grid; place-items: center; color: #fff; font-weight: 800; font-size: .72rem; letter-spacing: .02em;
}
.brand-sub { color: var(--text-faint); font-weight: 500; font-size: .82rem; }

.nav { display: flex; gap: .15rem; margin-left: auto; flex-wrap: wrap; align-items: center; }
.nav a {
    color: var(--text-dim); padding: .42rem .68rem; border-radius: var(--radius-sm);
    font-size: .875rem; font-weight: 550; white-space: nowrap;
}
.nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.nav a.active { background: var(--accent-soft); color: var(--accent-strong); }

.icon-btn {
    background: var(--surface-2); border: 1px solid var(--border); color: var(--text-dim);
    width: 34px; height: 34px; border-radius: var(--radius-sm); cursor: pointer;
    display: grid; place-items: center; flex: 0 0 auto; font-size: .95rem; padding: 0;
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text); }

.nav-toggle { display: none; }

/* ---------- countdown pill ---------- */
.countdown-pill {
    display: inline-flex; align-items: baseline; gap: .4rem;
    background: var(--amber-soft); color: var(--amber);
    border: 1px solid color-mix(in srgb, var(--amber) 30%, transparent);
    padding: .3rem .7rem; border-radius: 100px; font-size: .8rem; font-weight: 650; white-space: nowrap;
}
.countdown-pill b { font-size: 1rem; font-weight: 800; }

/* ---------- hero ---------- */
.hero {
    background: linear-gradient(150deg, var(--accent) 0%, #6d28d9 48%, var(--accent-2) 130%);
    color: #fff; padding: 3rem 0 3.25rem; margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}
.hero h1 { color: #fff; margin-bottom: .5rem; }
.hero p { color: rgba(255, 255, 255, .88); max-width: 62ch; margin-bottom: 0; }
.hero .eyebrow {
    text-transform: uppercase; letter-spacing: .12em; font-size: .74rem; font-weight: 700;
    color: rgba(255, 255, 255, .78); margin-bottom: .65rem;
}
.hero-stats { display: flex; flex-wrap: wrap; gap: 2rem; margin-top: 1.75rem; }
.hero-stat .n { font-size: 2rem; font-weight: 800; line-height: 1; color: #fff; }
.hero-stat .l { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: rgba(255, 255, 255, .78); margin-top: .35rem; }

/* ---------- cards ---------- */
.card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.35rem; box-shadow: var(--shadow);
}
.card > :last-child { margin-bottom: 0; }
.card h3 { margin-top: 0; }
.card-link { display: block; color: inherit; transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease; }
.card-link:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--accent); }

.grid { display: grid; gap: 1.1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }

.card-icon {
    width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
    font-size: 1.05rem; margin-bottom: .8rem; background: var(--accent-soft); color: var(--accent-strong);
}
.card-icon.teal { background: var(--accent-2-soft); color: var(--accent-2); }
.card-icon.amber { background: var(--amber-soft); color: var(--amber); }
.card-icon.good { background: var(--good-soft); color: var(--good); }
.card-icon.bad { background: var(--bad-soft); color: var(--bad); }

/* ---------- callouts ---------- */
.callout {
    --co: var(--accent);
    --co-bg: var(--accent-soft);
    border: 1px solid color-mix(in srgb, var(--co) 32%, transparent);
    background: color-mix(in srgb, var(--co-bg) 60%, var(--surface));
    padding: 1rem 1.15rem; border-radius: var(--radius-sm); margin: 1.25rem 0;
}
.callout > :last-child { margin-bottom: 0; }
.callout .callout-title {
    font-weight: 700; margin-bottom: .35rem; display: block; color: var(--co);
    font-size: .76rem; text-transform: uppercase; letter-spacing: .08em;
}
.callout.tip { --co: var(--accent-2); --co-bg: var(--accent-2-soft); }
.callout.warn { --co: var(--amber); --co-bg: var(--amber-soft); }
.callout.key { --co: var(--good); --co-bg: var(--good-soft); }
.callout.trap { --co: var(--bad); --co-bg: var(--bad-soft); }

/* ---------- badges ---------- */
.badge {
    display: inline-block; padding: .16rem .55rem; border-radius: 100px;
    font-size: .72rem; font-weight: 700; letter-spacing: .02em;
    background: var(--surface-3); color: var(--text-dim); white-space: nowrap;
}
.badge.accent { background: var(--accent-soft); color: var(--accent-strong); }
.badge.teal { background: var(--accent-2-soft); color: var(--accent-2); }
.badge.amber { background: var(--amber-soft); color: var(--amber); }
.badge.good { background: var(--good-soft); color: var(--good); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }

/* ---------- buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
    background: var(--accent); color: #fff; border: 1px solid transparent;
    padding: .58rem 1.05rem; border-radius: var(--radius-sm);
    font-size: .9rem; font-weight: 600; font-family: inherit; cursor: pointer; text-align: center;
}
.btn:hover { background: var(--accent-strong); text-decoration: none; color: #fff; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.secondary { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn.secondary:hover { background: var(--surface-3); border-color: var(--border-strong); color: var(--text); }
.btn.ghost { background: transparent; color: var(--accent); border-color: var(--border); }
.btn.ghost:hover { background: var(--accent-soft); color: var(--accent-strong); }
.btn.danger { background: var(--bad); }
.btn.danger:hover { background: var(--bad); filter: brightness(.92); }
.btn.sm { padding: .35rem .7rem; font-size: .8rem; }
.btn.lg { padding: .8rem 1.6rem; font-size: 1rem; }
.btn-row { display: flex; gap: .65rem; flex-wrap: wrap; align-items: center; }

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; margin: 1.25rem 0; -webkit-overflow-scrolling: touch; }
table.data-table, table.grid-table {
    border-collapse: collapse; width: 100%; font-size: .9rem; background: var(--surface);
}
table.data-table th, table.data-table td,
table.grid-table th, table.grid-table td {
    border: 1px solid var(--border); padding: .5rem .7rem; text-align: left; vertical-align: top;
}
table.data-table th, table.grid-table th {
    background: var(--surface-2); font-weight: 650; font-size: .82rem;
    letter-spacing: .01em; color: var(--text-dim);
}
table.data-table td { font-variant-numeric: tabular-nums; }
table.data-table tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--surface-2) 45%, transparent); }
.data-table caption { caption-side: top; text-align: left; font-weight: 650; padding-bottom: .45rem; font-size: .88rem; }

/* ---------- figures & diagrams ---------- */
.fig { margin: 1.15rem 0; }
.fig-title { font-weight: 650; font-size: .84rem; color: var(--text-dim); margin-bottom: .45rem; letter-spacing: .01em; }
.fig .diagram, svg.diagram {
    max-width: min(100%, 460px); height: auto; display: block; margin: 0 auto; color: var(--text);
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: .6rem;
}
.fig table.data-table { margin: 0; }

/* ---------- passages ---------- */
.passage {
    font-family: var(--font-read); font-size: 1.02rem; line-height: 1.85;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.5rem 1.6rem;
}
.passage p { margin: 0 0 1.05rem; position: relative; }
.passage > :last-child { margin-bottom: 0; }
.passage-intro { font-style: italic; color: var(--text-dim); font-size: .92rem; margin-bottom: 1.1rem; padding-bottom: .9rem; border-bottom: 1px solid var(--border); }
.sub-passage { margin-bottom: 1.6rem; }
.sub-passage:last-child { margin-bottom: 0; }
.sub-passage h4 { font-family: var(--font); font-size: .84rem; text-transform: uppercase; letter-spacing: .09em; color: var(--accent); margin: 0 0 .7rem; }
.sub-passage + .sub-passage { border-top: 1px solid var(--border); padding-top: 1.4rem; }

/* paragraph numbers */
.passage .pnum {
    display: inline-block; min-width: 1.5em; margin-right: .5em;
    font-family: var(--font); font-size: .7rem; font-weight: 700;
    color: var(--text-faint); vertical-align: .28em; user-select: none;
}

/* underlined ACT English portions */
.passage u[data-q] {
    text-decoration: underline; text-decoration-thickness: 2px;
    text-underline-offset: 3px; text-decoration-color: var(--accent);
    scroll-margin-top: 120px;
}
.passage u[data-q]::after,
.passage .qmark[data-q]::after {
    content: attr(data-q);
    display: inline-block; margin-left: .28em; padding: 0 .34em; min-width: 1.5em;
    font-family: var(--font); font-size: .66rem; font-weight: 800; line-height: 1.5;
    text-align: center; vertical-align: .42em; text-decoration: none;
    color: #fff; background: var(--accent); border-radius: 4px; user-select: none;
}
.passage .qmark[data-q] { scroll-margin-top: 120px; }
.passage u[data-q].q-active,
.passage .qmark[data-q].q-active { background: color-mix(in srgb, var(--amber) 24%, transparent); border-radius: 3px; }
.passage u[data-q].q-active::after,
.passage .qmark[data-q].q-active::after { background: var(--amber); color: #1c2030; }
.passage u[data-q].q-done::after,
.passage .qmark[data-q].q-done::after { background: var(--text-faint); }

/* ============================================================
   TEST ENGINE
   ============================================================ */
.test-shell { display: grid; grid-template-columns: minmax(0, 1fr) 268px; gap: 1.5rem; align-items: start; }

.exam-bar {
    position: sticky; top: 55px; z-index: 60; margin-bottom: 1.25rem;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: .7rem 1rem; box-shadow: var(--shadow);
    display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.exam-bar .section-name { font-weight: 700; font-size: .95rem; }
.exam-bar .sep { color: var(--border-strong); }
.timer {
    font-family: var(--font-mono); font-size: 1.28rem; font-weight: 700;
    font-variant-numeric: tabular-nums; color: var(--text); letter-spacing: -.02em;
}
.timer.warn { color: var(--amber); }
.timer.danger { color: var(--bad); animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1 } 50% { opacity: .55 } }
.exam-bar .spacer { margin-left: auto; }

.pace-bar { height: 4px; background: var(--surface-3); border-radius: 3px; overflow: hidden; width: 100%; margin-top: .3rem; }
.pace-bar i { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: left center; transform: scaleX(0); transition: transform .4s cubic-bezier(.22, 1, .36, 1); }

.split { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); gap: 1.4rem; align-items: start; }
.split .passage-col { position: sticky; top: 122px; max-height: calc(100vh - 145px); overflow-y: auto; }

.q-list { display: flex; flex-direction: column; gap: 1rem; }
.q-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.1rem 1.2rem; scroll-margin-top: 130px;
}
.q-card.is-current { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.q-head { display: flex; align-items: center; gap: .6rem; margin-bottom: .7rem; }
.q-num {
    width: 27px; height: 27px; border-radius: 7px; display: grid; place-items: center;
    background: var(--accent-soft); color: var(--accent-strong);
    font-weight: 800; font-size: .8rem; flex: 0 0 auto;
}
.q-prompt { margin-bottom: .85rem; }
.q-prompt > :last-child { margin-bottom: 0; }
.q-prompt .fig { margin-top: .35rem; }
.flag-btn {
    margin-left: auto; background: none; border: 1px solid var(--border); color: var(--text-faint);
    border-radius: var(--radius-sm); padding: .2rem .55rem; font-size: .74rem; cursor: pointer; font-family: inherit; font-weight: 600;
}
.flag-btn:hover { border-color: var(--amber); color: var(--amber); }
.flag-btn.on { background: var(--amber-soft); border-color: var(--amber); color: var(--amber); }

.choices { display: flex; flex-direction: column; gap: .45rem; }
.choice {
    display: flex; align-items: flex-start; gap: .7rem;
    padding: .6rem .8rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
    cursor: pointer; background: var(--surface); transition: background .1s ease, border-color .1s ease;
}
.choice:hover { background: var(--surface-2); border-color: var(--border-strong); }
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice .letter {
    flex: 0 0 auto; width: 24px; height: 24px; border-radius: 50%;
    border: 1.5px solid var(--border-strong); display: grid; place-items: center;
    font-size: .76rem; font-weight: 800; color: var(--text-dim); background: var(--surface);
}
.choice .ctext { flex: 1 1 auto; }
.choice .ctext > :last-child { margin-bottom: 0; }
.choice.selected { border-color: var(--accent); background: var(--accent-soft); }
.choice.selected .letter { background: var(--accent); border-color: var(--accent); color: #fff; }

/* review mode */
.choice.correct { border-color: var(--good); background: var(--good-soft); }
.choice.correct .letter { background: var(--good); border-color: var(--good); color: #fff; }
.choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.choice.wrong .letter { background: var(--bad); border-color: var(--bad); color: #fff; }
.review-mode .choice { cursor: default; }
.review-mode .choice:hover { background: var(--surface); border-color: var(--border); }
.review-mode .choice.correct:hover { background: var(--good-soft); border-color: var(--good); }
.review-mode .choice.wrong:hover { background: var(--bad-soft); border-color: var(--bad); }

.explain {
    margin-top: .85rem; padding: .8rem 1rem; border-radius: var(--radius-sm);
    background: var(--surface-2); border: 1px solid var(--border); font-size: .92rem;
}
.explain > :last-child { margin-bottom: 0; }
.explain .explain-head { font-weight: 700; font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); margin-bottom: .4rem; }

/* question palette */
.palette {
    position: sticky; top: 122px; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow);
}
.palette h4 { margin: 0 0 .7rem; font-size: .76rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); }
.palette-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(32px, 1fr)); gap: .3rem; }
.pdot {
    aspect-ratio: 1; border: 1px solid var(--border); border-radius: 6px; background: var(--surface);
    color: var(--text-dim); font-size: .74rem; font-weight: 700; cursor: pointer;
    display: grid; place-items: center; font-family: inherit; padding: 0;
}
.pdot:hover { border-color: var(--accent); color: var(--accent); }
.pdot.answered { background: var(--accent); border-color: var(--accent); color: #fff; }
.pdot.flagged { border-color: var(--amber); box-shadow: inset 0 0 0 2px var(--amber-soft); }
.pdot.flagged::after { content: ""; position: absolute; }
.pdot.current { outline: 2px solid var(--accent); outline-offset: 1px; }
.pdot.right { background: var(--good); border-color: var(--good); color: #fff; }
.pdot.wrong { background: var(--bad); border-color: var(--bad); color: #fff; }
.pdot.blank { background: var(--surface-3); border-color: var(--border-strong); color: var(--text-faint); }
.palette-legend { margin-top: .8rem; font-size: .72rem; color: var(--text-dim); display: flex; flex-direction: column; gap: .28rem; }
.palette-legend span { display: flex; align-items: center; gap: .4rem; }
.swatch { width: 11px; height: 11px; border-radius: 3px; border: 1px solid var(--border-strong); flex: 0 0 auto; }

/* results */
.score-hero {
    background: linear-gradient(150deg, var(--accent) 0%, #6d28d9 55%, var(--accent-2) 140%);
    color: #fff; border-radius: var(--radius-lg); padding: 2rem; text-align: center; margin-bottom: 1.5rem;
}
.score-hero .composite { font-size: 4.5rem; font-weight: 800; line-height: 1; }
.score-hero .composite-label { text-transform: uppercase; letter-spacing: .12em; font-size: .74rem; opacity: .85; }
.score-hero .delta { font-size: 1rem; opacity: .95; margin-top: .5rem; }

.score-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .9rem; }
.score-tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; text-align: center; }
.score-tile .sname { font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); font-weight: 700; }
.score-tile .sval { font-size: 2.4rem; font-weight: 800; line-height: 1.1; margin: .2rem 0; }
.score-tile .sraw { font-size: .8rem; color: var(--text-dim); }
.score-tile .schg { font-size: .8rem; font-weight: 700; margin-top: .3rem; }
.up { color: var(--good); }
.down { color: var(--bad); }
.flat { color: var(--text-faint); }

/* meters */
.meter { background: var(--surface-3); border-radius: 100px; height: 9px; overflow: hidden; margin: .35rem 0; }
.meter i { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: left center; transform: scaleX(0); transition: transform .5s cubic-bezier(.22, 1, .36, 1); }
.meter i.good { background: var(--good); }
.meter i.amber { background: var(--amber); }
.meter i.bad { background: var(--bad); }
.meter-row { display: flex; align-items: center; gap: .8rem; margin-bottom: .7rem; }
.meter-row .mlabel { flex: 0 0 auto; width: 190px; font-size: .87rem; }
.meter-row .meter { flex: 1 1 auto; margin: 0; }
.meter-row .mval { flex: 0 0 auto; width: 74px; text-align: right; font-size: .84rem; font-variant-numeric: tabular-nums; color: var(--text-dim); }

/* ---------- study plan ---------- */
.day-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 1.1rem 1.25rem; margin-bottom: .9rem;
}
.day-card.is-today { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.day-card.is-past { opacity: .62; }
.day-card.all-done { border-color: var(--good); }
.day-head { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; margin-bottom: .8rem; }
.day-chip {
    background: var(--accent); color: #fff; border-radius: 8px; padding: .28rem .6rem;
    font-weight: 800; font-size: .78rem; flex: 0 0 auto; min-width: 62px; text-align: center;
}
.day-card.is-past .day-chip { background: var(--text-faint); }
.day-card.all-done .day-chip { background: var(--good); }
.day-date { font-size: .82rem; color: var(--text-dim); font-weight: 600; }
.day-focus { font-weight: 700; font-size: 1rem; }
.day-time { margin-left: auto; font-size: .8rem; color: var(--text-dim); font-weight: 600; }

.task { display: flex; align-items: flex-start; gap: .65rem; padding: .38rem 0; }
.task input[type="checkbox"] { margin-top: .35rem; width: 17px; height: 17px; accent-color: var(--accent); cursor: pointer; flex: 0 0 auto; }
.task label { cursor: pointer; flex: 1 1 auto; font-size: .93rem; }
.task input:checked + label { text-decoration: line-through; color: var(--text-faint); }
.task .tag { font-size: .68rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; padding: .08rem .4rem; border-radius: 4px; margin-right: .45rem; vertical-align: 1px; }
.tag-math { background: var(--accent-soft); color: var(--accent-strong); }
.tag-english { background: var(--accent-2-soft); color: var(--accent-2); }
.tag-reading { background: var(--amber-soft); color: var(--amber); }
.tag-science { background: var(--good-soft); color: var(--good); }
.tag-writing { background: var(--bad-soft); color: var(--bad); }
.tag-test { background: var(--surface-3); color: var(--text-dim); }

.week-head {
    display: flex; align-items: baseline; gap: .8rem; margin: 2.2rem 0 1rem;
    padding-bottom: .5rem; border-bottom: 2px solid var(--accent); flex-wrap: wrap;
}
.week-head h2 { margin: 0; font-size: 1.3rem; }
.week-head .wgoal { color: var(--text-dim); font-size: .9rem; }

/* ---------- tools ---------- */
.tool-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.4rem; }
.field { margin-bottom: .9rem; }
.field label { display: block; font-size: .82rem; font-weight: 650; color: var(--text-dim); margin-bottom: .3rem; }
input[type="number"], input[type="text"], input[type="date"], select, textarea {
    width: 100%; padding: .5rem .7rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: var(--surface); color: var(--text); font-family: inherit; font-size: .92rem;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
textarea { resize: vertical; min-height: 90px; }

.big-timer {
    font-family: var(--font-mono); font-size: clamp(3rem, 12vw, 5.5rem); font-weight: 700;
    text-align: center; font-variant-numeric: tabular-nums; letter-spacing: -.03em; line-height: 1; margin: .5rem 0 1rem;
}
.big-timer.warn { color: var(--amber); }
.big-timer.danger { color: var(--bad); }

.flashcard {
    background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
    min-height: 260px; display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 2rem 1.75rem; text-align: center; cursor: pointer; box-shadow: var(--shadow); position: relative;
}
.flashcard:hover { border-color: var(--accent); }
.flashcard .fc-side { font-size: .68rem; text-transform: uppercase; letter-spacing: .12em; color: var(--text-faint); position: absolute; top: 1rem; left: 1.25rem; font-weight: 700; }
.flashcard .fc-deck { font-size: .68rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); position: absolute; top: 1rem; right: 1.25rem; font-weight: 700; }
.flashcard .fc-front { font-size: 1.5rem; font-weight: 700; }
.flashcard .fc-back { font-size: 1.05rem; text-align: left; width: 100%; }
.flashcard .fc-back > :last-child { margin-bottom: 0; }
.flashcard .fc-hint { position: absolute; bottom: .9rem; font-size: .72rem; color: var(--text-faint); }

.errlog-row { display: grid; grid-template-columns: 90px 1fr 1fr 34px; gap: .5rem; align-items: center; margin-bottom: .45rem; }
.errlog-row .del { background: none; border: 1px solid var(--border); color: var(--text-faint); border-radius: 6px; cursor: pointer; height: 32px; }
.errlog-row .del:hover { color: var(--bad); border-color: var(--bad); }

/* ---------- misc ---------- */
.toc { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.35rem; margin-bottom: 2rem; }
.toc h4 { margin: 0 0 .6rem; font-size: .76rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); }
.toc ul { columns: 2; column-gap: 2rem; margin: 0; padding-left: 1.1rem; }
.toc li { break-inside: avoid; margin-bottom: .3rem; font-size: .9rem; }

details.acc { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: .6rem; background: var(--surface); }
details.acc > summary {
    cursor: pointer; padding: .75rem 1rem; font-weight: 650; font-size: .95rem; list-style: none;
    display: flex; align-items: center; gap: .6rem;
}
details.acc > summary::-webkit-details-marker { display: none; }
details.acc > summary::before { content: "\25B8"; color: var(--accent); transition: transform .15s ease; flex: 0 0 auto; }
details.acc[open] > summary::before { transform: rotate(90deg); }
details.acc > summary:hover { background: var(--surface-2); }
details.acc .acc-body { padding: 0 1rem 1rem; border-top: 1px solid var(--border); padding-top: .9rem; }
details.acc .acc-body > :last-child { margin-bottom: 0; }

.rule-card { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .9rem 1.1rem; background: var(--surface); margin-bottom: .8rem; }
.rule-card h4 { margin: 0 0 .35rem; font-size: .96rem; color: var(--accent-strong); }
.rule-card > :last-child { margin-bottom: 0; }
.ex-good { color: var(--good); font-weight: 600; }
.ex-bad { color: var(--bad); font-weight: 600; text-decoration: line-through dotted; }

.formula-box {
    background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: .7rem 1rem; font-family: var(--font-read); font-size: 1.05rem; text-align: center; margin: .7rem 0;
}

.footer { border-top: 1px solid var(--border); padding: 2rem 0 3rem; color: var(--text-faint); font-size: .85rem; margin-top: 3rem; background: var(--surface); }
.footer a { color: var(--text-dim); }

.toast {
    position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%) translateY(120%);
    background: var(--text); color: var(--bg); padding: .7rem 1.3rem; border-radius: 100px;
    font-size: .88rem; font-weight: 600; z-index: 300; transition: transform .32s cubic-bezier(.22, 1, .36, 1); box-shadow: var(--shadow-lg);
}
.toast.show { transform: translateX(-50%) translateY(0); }

.modal-back {
    position: fixed; inset: 0; background: rgba(8, 10, 18, .62); z-index: 200;
    display: grid; place-items: center; padding: 1.25rem; backdrop-filter: blur(3px);
}
.modal-back[hidden] { display: none; }
.modal {
    background: var(--surface); border-radius: var(--radius-lg); padding: 1.75rem;
    max-width: 480px; width: 100%; box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.modal h3 { margin-top: 0; }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
    .test-shell { grid-template-columns: 1fr; }
    .palette { position: static; }
    .palette-grid { grid-template-columns: repeat(auto-fill, minmax(34px, 1fr)); }
    .split { grid-template-columns: 1fr; }
    .split .passage-col { position: static; max-height: none; }
}

@media (max-width: 760px) {
    body { font-size: 15.5px; }
    .nav-toggle { display: grid; }
    .nav {
        display: none; position: absolute; top: 100%; left: 0; right: 0;
        background: var(--surface); border-bottom: 1px solid var(--border);
        flex-direction: column; align-items: stretch; padding: .6rem; gap: .1rem; box-shadow: var(--shadow-lg);
    }
    .nav.open { display: flex; }
    .nav a { padding: .6rem .8rem; }
    .toc ul { columns: 1; }
    .hero { padding: 2.25rem 0 2.5rem; }
    .hero-stats { gap: 1.4rem; }
    .meter-row { flex-wrap: wrap; }
    .meter-row .mlabel { width: 100%; }
    .errlog-row { grid-template-columns: 1fr 1fr; }
    .exam-bar { top: 52px; }
    .passage { padding: 1.1rem 1rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

/* ---------- print ---------- */
@media print {
    .topbar, .footer, .palette, .btn, .btn-row, .flag-btn, .exam-bar, .no-print { display: none !important; }
    body { background: #fff; color: #000; font-size: 11pt; }
    .card, .day-card, .q-card, .passage, .tool-panel { border: 1px solid #bbb; box-shadow: none; break-inside: avoid; }
    .hero { background: none !important; color: #000; border-bottom: 2px solid #000; }
    .hero h1, .hero p, .hero .eyebrow, .hero-stat .n, .hero-stat .l { color: #000 !important; }
    .split, .test-shell { grid-template-columns: 1fr; }
    a { color: #000; text-decoration: none; }
    .week-head { break-after: avoid; }
}

/* ---------- AI-900 additions ---------- */
a.countdown-pill { text-decoration: none; cursor: pointer; }
a.countdown-pill:hover { text-decoration: none; border-color: var(--amber); filter: brightness(1.03); }
.day-card .badge { vertical-align: 1px; }
#quickDates { flex-wrap: wrap; margin-bottom: .2rem; }

/* ---------- AI-901 additions ---------- */
a.countdown-pill { text-decoration: none; cursor: pointer; }
a.countdown-pill:hover { text-decoration: none; border-color: var(--amber); filter: brightness(1.03); }
.day-card .badge { vertical-align: 1px; }
#quickDates { flex-wrap: wrap; margin-bottom: .2rem; }

/* code blocks -- AI-901 expects Python familiarity, so guides and questions
   show real snippets. */
.codeblock {
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: .85rem 1.05rem; margin: .8rem 0;
    overflow-x: auto;
}
.codeblock pre { margin: 0; }
.codeblock code, pre code {
    display: block; background: none; padding: 0; border-radius: 0;
    font-family: var(--font-mono); font-size: .84rem; line-height: 1.6;
    color: var(--text); white-space: pre;
}
.codeblock .cb-title {
    display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em;
    font-weight: 700; color: var(--text-faint); margin-bottom: .5rem;
}
.q-prompt .codeblock { margin: .7rem 0 0; }

/* inline good/bad example markers used in prompt-engineering sections */
.ex-block { border-left: 3px solid var(--border-strong); padding: .1rem 0 .1rem .9rem; margin: .7rem 0; }
.ex-block.good { border-left-color: var(--good); }
.ex-block.bad { border-left-color: var(--bad); }
.ex-block > :last-child { margin-bottom: 0; }

/* hands-on lab tasks -- AI-901 is 55-60% implementation, so lab tasks in the
   study plan get a filled badge to stand out from reading tasks. */
.tag-lab { background: var(--accent); color: #fff; }
[data-theme="dark"] .tag-lab { color: #14121f; }