:root {
    --bg: #f5f6f8;
    --surface: #ffffff;
    --ink: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --line-strong: #d1d5db;
    --brand: #0f766e;
    --brand-dark: #0d5f59;
    --brand-soft: #ecfdf8;
    --danger: #b91c1c;
    --success: #047857;
    --warn: #b45309;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 1px 2px rgba(17, 24, 39, 0.04), 0 4px 16px rgba(17, 24, 39, 0.04);
    --font: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --footer-h: 56px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font);
    color: var(--ink);
    background: var(--bg);
    min-height: 100vh;
    line-height: 1.6;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    padding-bottom: calc(var(--footer-h) + 12px);
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); text-decoration: underline; }

.container {
    width: min(1080px, calc(100% - 2rem));
    margin: 0 auto;
}
.main { padding: 2rem 0 3.5rem; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: #fff;
    border-bottom: 1px solid var(--line);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 60px;
    gap: 1.5rem;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
    text-decoration: none;
    color: inherit;
}
.brand:hover { text-decoration: none; color: inherit; }
.brand-mark {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink);
    white-space: nowrap;
}
.brand-sub {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--muted);
    border-left: 1px solid var(--line-strong);
    padding-left: 0.75rem;
    line-height: 1.2;
}
.nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}
.nav > a:not(.btn) {
    color: #374151;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
}
.nav > a:not(.btn):hover { color: var(--ink); }
.nav-user { color: var(--muted); font-size: 0.85rem; }

.hero {
    display: grid;
    grid-template-columns: 1.35fr 0.9fr;
    gap: 0;
    margin: 0 0 2.75rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.hero-copy { padding: 2.75rem 2.5rem; }
.eyebrow {
    margin: 0 0 0.85rem;
    color: var(--brand);
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
}
.hero-title,
.hero h1 {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 3.5vw, 2.5rem);
    line-height: 1.2;
    letter-spacing: -0.03em;
    font-weight: 700;
    color: var(--ink);
}
.hero-lead {
    margin: 0 0 1.75rem;
    max-width: 34rem;
    color: var(--muted);
    font-size: 0.98rem;
    line-height: 1.75;
}
.hero-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.hero-aside {
    background: #0f172a;
    color: #e5e7eb;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
}
.hero-stat-label {
    display: block;
    font-size: 0.75rem;
    color: #94a3b8;
    margin-bottom: 0.35rem;
    letter-spacing: 0.04em;
}
.hero-stat-value {
    display: block;
    font-size: 0.98rem;
    font-weight: 600;
    color: #f8fafc;
    letter-spacing: -0.01em;
}

.section { margin-bottom: 2.75rem; }
.section-head,
.page-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--line);
}
.section-title,
.section h2,
.page-head h1,
h1 {
    margin: 0;
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
}
.section-desc,
.page-head .muted {
    margin: 0.3rem 0 0;
    color: var(--muted);
    font-size: 0.9rem;
}
.text-link {
    color: var(--brand);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    margin-top: 0.2rem;
}
.text-link:hover { color: var(--brand-dark); }

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}
.soft-card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.15rem 1.2rem 1.25rem;
    color: inherit;
    text-decoration: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.soft-card:hover {
    text-decoration: none;
    color: inherit;
    border-color: #99f6e4;
    box-shadow: var(--shadow);
}
.soft-card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}
.soft-card h3 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.stat-num {
    margin: 0;
    font-size: 1.7rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
}
.stat-days {
    display: grid;
    gap: 0.55rem;
    margin-bottom: 1.75rem;
}
.stat-day-meta {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    font-size: 0.88rem;
    margin-bottom: 0.25rem;
}
.stat-bar {
    height: 8px;
    background: var(--line);
    border-radius: 99px;
    overflow: hidden;
}
.stat-bar span {
    display: block;
    height: 100%;
    background: var(--brand);
    min-width: 0;
}
.code {
    font-size: 0.75rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.news-list {
    display: grid;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}
.news-item {
    display: grid;
    grid-template-columns: 7.5rem 1fr;
    gap: 1rem;
    align-items: start;
    padding: 1.1rem 1.25rem;
    border-bottom: 1px solid var(--line);
    color: inherit;
    text-decoration: none;
}
.news-item:last-child { border-bottom: none; }
.news-item:hover {
    background: #fafafa;
    text-decoration: none;
    color: inherit;
}
.news-item h3 {
    margin: 0 0 0.3rem;
    font-size: 0.98rem;
    font-weight: 600;
}
.news-item-body .muted {
    font-size: 0.88rem;
    line-height: 1.55;
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}
.filter-row a {
    border: 1px solid var(--line-strong);
    border-radius: 4px;
    padding: 0.4rem 0.85rem;
    color: #374151;
    background: #fff;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
}
.filter-row a:hover { border-color: var(--brand); color: var(--brand); }
.filter-row a.is-active {
    background: var(--ink);
    border-color: var(--ink);
    color: #fff;
}

.article-page {
    max-width: 720px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 2rem 2.25rem;
}
.article-page h1 {
    margin: 0.5rem 0 1.25rem;
    font-size: 1.65rem;
}
.article-body {
    line-height: 1.85;
    font-size: 0.98rem;
    margin: 0 0 1.75rem;
    color: #1f2937;
}
.article-body h2,
.article-body h3,
.article-body h4 {
    margin: 1.25rem 0 0.55rem;
    line-height: 1.35;
}
.article-body p { margin: 0 0 0.85rem; }
.article-body ul,
.article-body ol { margin: 0 0 0.85rem; padding-left: 1.4rem; }
.article-body blockquote {
    margin: 0.85rem 0;
    padding: 0.35rem 0.85rem;
    border-left: 3px solid var(--brand);
    color: var(--muted);
    background: #f8fafc;
}
.article-body a { color: var(--brand-dark); }
.article-body pre {
    overflow: auto;
    padding: 0.75rem 0.9rem;
    background: #0f172a;
    color: #e2e8f0;
    border-radius: 6px;
    font-size: 0.86rem;
}

.rich-field {
    display: grid;
    gap: 0.4rem;
}
.rich-field > span {
    font-size: 0.88rem;
    color: var(--muted);
}
.rich-shell {
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    overflow: hidden;
    background: #fff;
}
.rich-shell:focus-within {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}
.rich-field .ql-toolbar.ql-snow {
    border: none;
    border-bottom: 1px solid var(--line-strong);
    background: #f8fafc;
}
.rich-field .ql-container.ql-snow {
    border: none;
    font-family: inherit;
    font-size: 0.95rem;
}
.rich-field .ql-editor {
    min-height: 260px;
    line-height: 1.7;
}
.rich-field .ql-editor.ql-blank::before {
    color: #94a3b8;
    font-style: normal;
}

.ai-box {
    margin-top: 0.85rem;
    padding: 0.95rem 1rem;
    border-radius: var(--radius);
    background: var(--brand-soft);
    border: 1px solid #99f6e4;
}
.ai-box p { margin: 0.45rem 0 0; line-height: 1.65; }
.ai-box.ai-explain {
    background: #f8fafc;
    border-color: var(--line-strong);
}
.ai-explain .ai-section-label {
    display: inline-block;
    margin-top: 0.55rem;
    padding: 0.12rem 0.45rem;
    border-radius: 4px;
    background: var(--brand-soft);
    color: var(--brand-dark);
    font-size: 0.82rem;
    font-weight: 700;
    line-height: 1.4;
}
.ai-explain .ai-section-label:first-child {
    margin-top: 0;
}
.ai-explain-body {
    margin-top: 0.45rem;
    line-height: 1.7;
}
.self-form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    align-items: center;
    margin-top: 0.85rem;
}

.site-footer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    min-height: var(--footer-h);
    display: flex;
    align-items: center;
    border-top: 1px solid var(--line);
    background: #fff;
    color: var(--muted);
    font-size: 0.85rem;
    box-shadow: 0 -4px 16px rgba(17, 24, 39, 0.04);
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    width: min(1080px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 0.85rem 0;
}
.footer-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.footer-left strong { color: var(--ink); font-weight: 600; }
.footer-right {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-wrap: wrap;
}
.footer-icp {
    color: var(--muted);
    text-decoration: none;
}
.footer-icp:hover {
    color: var(--ink);
    text-decoration: underline;
}

h2 { margin: 0 0 0.85rem; font-size: 1.05rem; font-weight: 600; }
.muted { color: var(--muted); margin: 0; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 0.55rem 1.05rem;
    font: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn:hover { text-decoration: none; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.82rem; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-ghost {
    background: #fff;
    border-color: var(--line-strong);
    color: #111827;
}
.btn-ghost:hover { background: #f9fafb; color: #111827; }
.btn-block { width: 100%; }

.alert {
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    margin-bottom: 1.25rem;
    border: 1px solid transparent;
    font-size: 0.9rem;
}
.alert-success { background: #ecfdf5; border-color: #a7f3d0; color: var(--success); }
.alert-error { background: #fef2f2; border-color: #fecaca; color: var(--danger); }

.auth-panel {
    width: min(400px, 100%);
    margin: 2.5rem auto;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 2rem 1.75rem;
}
.auth-panel h1 { margin-bottom: 0.25rem; font-size: 1.45rem; }
.auth-panel > .muted { margin-bottom: 1.35rem; font-size: 0.9rem; }

.form { display: grid; gap: 1rem; }
.form-wide {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.5rem;
}
.form label { display: grid; gap: 0.4rem; }
.form label > span {
    font-size: 0.82rem;
    color: var(--muted);
    font-weight: 500;
}
.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form input[type="number"],
.form input[type="search"],
.form input[type="url"],
.form select,
.form textarea,
.question-card textarea {
    width: 100%;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    padding: 0.65rem 0.8rem;
    font: inherit;
    background: #fff;
    color: var(--ink);
}
.form input:focus,
.form select:focus,
.form textarea:focus,
.question-card textarea:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
}
.question-card textarea { min-height: 120px; line-height: 1.65; }
.form-foot { margin-top: 1rem; color: var(--muted); font-size: 0.9rem; }
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 1rem;
}

.paper-list { display: grid; gap: 0.75rem; }
.paper-item {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.1rem 1.2rem;
}
.wrong-item .wrong-check {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    cursor: pointer;
}
.wrong-item .wrong-check input {
    width: 1.05rem;
    height: 1.05rem;
}
.wrong-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: flex-end;
}
.wrong-filters {
    display: grid;
    gap: 0.85rem;
    margin: 0 0 1.25rem;
    padding: 1rem 1.1rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}
.wrong-filter-row {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}
.wrong-filter-label {
    flex: 0 0 2.5rem;
    padding-top: 0.35rem;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
}
.wrong-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    min-width: 0;
}
.wrong-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.65rem;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: #fff;
    color: var(--ink);
    font-size: 0.84rem;
    text-decoration: none;
    line-height: 1.3;
}
.wrong-chip:hover {
    border-color: var(--brand);
    color: var(--brand-dark);
}
.wrong-chip.is-active {
    border-color: var(--brand);
    background: var(--brand-soft);
    color: var(--brand-dark);
    font-weight: 600;
}
.wrong-chip-count {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 500;
}
.wrong-chip.is-active .wrong-chip-count {
    color: var(--brand-dark);
}
.wrong-group {
    margin-bottom: 1.35rem;
}
.wrong-group-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
    margin: 0 0 0.65rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--line);
}
.wrong-group-head h2 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
}

.drill {
    width: min(720px, 100%);
    margin: 0 auto;
}
.drill-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.65rem;
}
.drill-pos {
    color: var(--ink);
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
}
.drill-bar {
    height: 6px;
    background: var(--line);
    border-radius: 99px;
    overflow: hidden;
    margin-bottom: 1rem;
}
.drill-bar span {
    display: block;
    height: 100%;
    background: var(--brand);
}
.drill-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.3rem 1.4rem;
    box-shadow: var(--shadow);
}
.drill-stem {
    margin: 0.75rem 0 1rem;
    font-size: 1.15rem;
    line-height: 1.65;
    font-weight: 600;
}
.drill-options .option,
.drill-form .option {
    min-height: 48px;
}
.drill-form textarea {
    width: 100%;
    margin-bottom: 0.85rem;
}
.drill-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 0.9rem;
}
.drill-result {
    margin: 0.85rem 0 0;
    font-weight: 700;
}
.drill-result.is-ok { color: var(--success); }
.drill-result.is-no { color: var(--danger); }
.drill-answer-box {
    margin-top: 0.85rem;
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    background: #f8fafc;
    border: 1px solid var(--line);
    line-height: 1.7;
}
.drill-user {
    margin-top: 0.4rem;
    padding: 0.75rem 0.9rem;
    border-radius: var(--radius);
    background: #fff;
    border: 1px dashed var(--line-strong);
}
.drill-user p { margin: 0.35rem 0 0; }
.option-static {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    cursor: default;
}
.option-static em {
    font-style: normal;
    font-size: 0.78rem;
    color: var(--muted);
    white-space: nowrap;
}
.option-static.is-right {
    border-color: #6ee7b7;
    background: #ecfdf5;
}
.option-static.is-bad {
    border-color: #fca5a5;
    background: #fef2f2;
}
.drill-auto { margin: 0.65rem 0 0; }
.drill-foot { margin-top: 0.85rem; }
.drill-done h1 { margin-bottom: 0.6rem; }
.drill-done .btn { margin-top: 0.4rem; }
.paper-item-main {
    flex: 1;
    min-width: 0;
}
.chapter-practice-item {
    align-items: flex-start;
}
.type-pick {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.65rem;
}
.type-pick-item {
    display: inline-flex !important;
    align-items: center;
    gap: 0.35rem;
    margin: 0;
    padding: 0.28rem 0.55rem;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: #fff;
    font-size: 0.82rem;
    color: var(--ink);
    cursor: pointer;
    grid-template-columns: none !important;
}
.type-pick-item input {
    width: 0.95rem;
    height: 0.95rem;
    margin: 0;
}
.type-pick-item:has(input:checked) {
    border-color: var(--brand);
    background: var(--brand-soft);
    color: var(--brand-dark);
}
.paper-item-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 0.4rem;
}
.paper-item h2,
.paper-item h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.45;
    word-break: break-word;
}
.meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    list-style: none;
    padding: 0;
    margin: 0.65rem 0 0;
    color: var(--muted);
    font-size: 0.8rem;
}
.meta-row li {
    background: #f3f4f6;
    border-radius: 4px;
    padding: 0.2rem 0.55rem;
    color: #4b5563;
}

.empty {
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius);
    padding: 2.5rem 1.25rem;
    text-align: center;
    color: var(--muted);
    background: #fff;
}

.exam-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.15rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--line);
}
.timer {
    font-variant-numeric: tabular-nums;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.45rem 0.85rem;
    min-width: 96px;
    text-align: center;
}
.timer.is-warning { color: var(--warn); }
.timer.is-danger { color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: 0.5; } }

.exam-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 1rem;
    align-items: start;
}
.exam-questions { display: grid; gap: 0.85rem; }
.question-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.15rem 1.2rem;
    scroll-margin-top: 76px;
}
.question-card.is-correct { border-color: #6ee7b7; background: #f0fdf4; }
.question-card.is-wrong { border-color: #fca5a5; background: #fef2f2; }
.question-card.is-partial { border-color: #fcd34d; background: #fffbeb; }
.practice-tools {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    margin-top: 0.9rem;
    padding-top: 0.85rem;
    border-top: 1px dashed var(--line);
}
.practice-panel {
    margin-top: 0.75rem;
}
.question-head {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--muted);
    font-size: 0.82rem;
}
.badge {
    display: inline-flex;
    align-items: center;
    background: var(--brand-soft);
    color: var(--brand-dark);
    border-radius: 4px;
    padding: 0.15rem 0.5rem;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
/* 作答/成绩页防复制（题干与选项不可选；答题框仍可输入） */
.no-copy .question-card,
.no-copy .exam-questions,
.no-copy .result-options,
.no-copy .result-meta,
.no-copy .ai-box {
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}
.no-copy textarea,
.no-copy input[type="text"],
.no-copy input:not([type="radio"]):not([type="checkbox"]) {
    -webkit-user-select: text !important;
    user-select: text !important;
}

.stem {
    line-height: 1.7;
    margin-bottom: 0.9rem;
    font-size: 0.98rem;
}
.options { display: grid; gap: 0.5rem; }
.option {
    display: flex;
    gap: 0.65rem;
    align-items: flex-start;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    padding: 0.7rem 0.8rem;
    background: #fff;
    cursor: pointer;
}
.option:hover { border-color: #5eead4; }
.option:has(input:checked) {
    border-color: var(--brand);
    background: var(--brand-soft);
}

.answer-sheet {
    position: sticky;
    top: 76px;
    max-height: calc(100vh - 76px - var(--footer-h) - 20px);
    overflow: auto;
    overscroll-behavior: contain;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1rem;
}
.answer-sheet h2 { margin-bottom: 0.75rem; font-size: 0.95rem; }
.sheet-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.35rem;
    margin-bottom: 0.9rem;
}
.sheet-item {
    display: grid;
    place-items: center;
    height: 32px;
    border-radius: 4px;
    border: 1px solid var(--line-strong);
    color: var(--ink);
    background: #fff;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
}
.sheet-item:hover { text-decoration: none; }
.sheet-item.done {
    background: var(--brand);
    border-color: var(--brand);
    color: #fff;
}
.sheet-item.is-ok {
    background: #d1fae5;
    border-color: #6ee7b7;
    color: #065f46;
}
.sheet-item.is-partial {
    background: #fef3c7;
    border-color: #fcd34d;
    color: #92400e;
}
.sheet-item.is-bad {
    background: #fee2e2;
    border-color: #f87171;
    color: #991b1b;
}
.sheet-item.is-pending {
    background: #f8fafc;
    border-color: var(--line-strong);
    color: var(--muted);
}
.sheet-legend {
    list-style: none;
    margin: 0 0 0.85rem;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    font-size: 0.75rem;
}
.sheet-legend li {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}
.sheet-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    border: 1px solid transparent;
}
.sheet-dot.is-ok { background: #d1fae5; border-color: #6ee7b7; }
.sheet-dot.is-partial { background: #fef3c7; border-color: #fcd34d; }
.sheet-dot.is-bad { background: #fee2e2; border-color: #f87171; }
.sheet-dot.is-pending { background: #f8fafc; border-color: var(--line-strong); }
.sheet-actions { display: grid; gap: 0.5rem; }

.table-toolbar {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-bottom: 0.75rem;
}
.table-toolbar .checkbox-line {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    color: var(--muted);
    cursor: pointer;
}

.score-summary {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.35rem 1.4rem;
    margin-bottom: 1.15rem;
}
.score-big {
    display: flex;
    align-items: baseline;
    gap: 0.45rem;
    margin-bottom: 0.75rem;
}
.score-big .label { color: var(--muted); font-size: 0.9rem; }
.score-big strong {
    font-size: 2.4rem;
    letter-spacing: -0.03em;
    color: var(--ink);
    line-height: 1;
}
.result-options {
    margin: 0 0 0.75rem;
    padding-left: 1.1rem;
    color: var(--muted);
    font-size: 0.9rem;
}
.result-meta p { margin: 0.35rem 0; font-size: 0.92rem; }
.analysis { color: var(--ink); }

.table-wrap {
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}
.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 720px;
}
.table th, .table td {
    padding: 0.8rem 0.95rem;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
    font-size: 0.9rem;
}
.table th {
    background: #f9fafb;
    font-size: 0.78rem;
    color: var(--muted);
    font-weight: 600;
}
.table tr:last-child td { border-bottom: none; }
.cell-clip { max-width: 360px; }
.actions { display: flex; gap: 0.75rem; align-items: center; }
.inline { display: inline; margin: 0; }
.link-danger {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font: inherit;
    padding: 0;
}
.toolbar-form {
    display: flex;
    gap: 0.55rem;
    margin-bottom: 1rem;
}
.toolbar-form-wrap {
    flex-wrap: wrap;
    align-items: center;
}
.toolbar-form input,
.toolbar-form select {
    max-width: 280px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    padding: 0.55rem 0.75rem;
    font: inherit;
    background: #fff;
}
.toolbar-form-wrap select {
    max-width: 220px;
    min-width: 140px;
}
.per-page-label {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.88rem;
    color: var(--muted);
}
.per-page-label input[type="number"] {
    width: 4.5rem;
    max-width: 4.5rem !important;
    min-width: 0;
    text-align: center;
}
.pager-meta {
    margin: -0.35rem 0 0.75rem;
    font-size: 0.88rem;
}
.pager {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    margin-top: 1rem;
}
.pager-num {
    display: inline-grid;
    place-items: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 0.4rem;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    color: var(--ink);
    text-decoration: none;
    font-size: 0.88rem;
    background: #fff;
}
.pager-num:hover { text-decoration: none; background: #f9fafb; }
.pager-num.is-current {
    background: var(--brand);
    border-color: var(--brand);
    color: #fff;
    font-weight: 600;
}
.pager-ellipsis { color: var(--muted); padding: 0 0.15rem; }
.btn.is-disabled {
    opacity: 0.45;
    pointer-events: none;
}

/* 可搜索下拉 */
.ss-wrap {
    position: relative;
    min-width: 160px;
    max-width: 280px;
}
.ss-native {
    position: absolute !important;
    opacity: 0 !important;
    pointer-events: none !important;
    width: 1px !important;
    height: 1px !important;
    margin: 0 !important;
    padding: 0 !important;
    border: 0 !important;
}
.ss-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-width: 160px;
    max-width: 280px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    padding: 0.55rem 0.75rem;
    font: inherit;
    background: #fff;
    color: var(--ink);
    text-align: left;
    cursor: pointer;
    gap: 0.5rem;
}
.ss-trigger::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid var(--muted);
    flex-shrink: 0;
}
.ss-wrap.is-open .ss-trigger {
    border-color: var(--brand);
}
.ss-panel {
    position: absolute;
    z-index: 50;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    min-width: 220px;
    max-width: 360px;
    background: #fff;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
    padding: 0.45rem;
}
.ss-search {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.45rem 0.6rem;
    font: inherit;
    margin-bottom: 0.35rem;
}
.ss-list {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 240px;
    overflow: auto;
}
.ss-option {
    padding: 0.45rem 0.55rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    line-height: 1.35;
}
.ss-option:hover,
.ss-option.is-selected {
    background: var(--brand-soft);
}
.ss-empty {
    padding: 0.55rem;
    color: var(--muted);
    font-size: 0.85rem;
}

.inline-radio {
    display: inline-flex !important;
    align-items: center;
    gap: 0.35rem;
    margin-right: 0.9rem;
}
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.35rem 1rem;
    margin: 0.5rem 0 1rem;
}
fieldset {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.75rem 1rem 0.25rem;
    margin: 0 0 1rem;
}
fieldset legend {
    padding: 0 0.35rem;
    color: var(--muted);
    font-size: 0.9rem;
}
.checkbox-label .checkbox-line {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 38px;
}
.pick-list {
    display: grid;
    gap: 0.45rem;
    max-height: 400px;
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.75rem;
    background: #fff;
}
.pick-item {
    display: flex !important;
    gap: 0.6rem;
    align-items: flex-start;
    grid-template-columns: none !important;
}

@media (max-width: 860px) {
    .hero { grid-template-columns: 1fr; }
    .hero-copy { padding: 1.75rem 1.35rem; }
    .hero-aside { padding: 1.35rem; gap: 1rem; }
    .exam-layout { grid-template-columns: 1fr; }
    .answer-sheet { position: static; }
    .paper-item { flex-direction: column; align-items: stretch; }
    .page-head,
    .section-head { flex-direction: column; }
    .news-item { grid-template-columns: 1fr; gap: 0.5rem; }
    .brand-sub { display: none; }
    .article-page { padding: 1.35rem; }
    .wrong-filter-row { flex-direction: column; gap: 0.4rem; }
    .wrong-filter-label { padding-top: 0; }

    body { padding-bottom: 0; }
    .main { padding: 1.15rem 0 2rem; }
    .container { width: min(1080px, calc(100% - 1.5rem)); }

    .header-inner {
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0.35rem;
        min-height: 0;
        padding: 0.7rem 0 0.55rem;
    }
    .nav {
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: 0.4rem 0.95rem;
        overflow: visible;
        padding-bottom: 0.15rem;
    }
    .nav > a:not(.btn),
    .nav-user,
    .nav .btn {
        flex-shrink: 0;
        white-space: nowrap;
    }

    .site-footer {
        position: static;
        box-shadow: none;
    }
    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
        padding: 0.85rem 0 1rem;
    }

    .wrong-actions { justify-content: flex-start; }
    .wrong-chip { padding: 0.4rem 0.7rem; }
    .table-toolbar {
        flex-wrap: wrap;
        align-items: center;
        gap: 0.55rem 0.85rem;
    }
}