:root {
    --discover-blue: #1a73e8;
    --discover-blue-strong: #1558b0;
    --discover-blue-soft: #e8f0fe;
    --discover-ink: #202124;
    --discover-muted: #5f6368;
    --discover-line: #dadce0;
    --discover-panel: #f8f9fa;
    --discover-green: #188038;
    --discover-amber: #b06000;
    --discover-red: #c5221f;
    --discover-shadow: 0 10px 28px rgba(60, 64, 67, .12);
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body {
    margin: 0;
    color: var(--discover-ink);
    background: #f6f8fc;
    font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.discover-header {
    position: sticky;
    top: 0;
    z-index: 30;
    height: 68px;
    border-bottom: 1px solid var(--discover-line);
    background: rgba(255, 255, 255, .96);
    backdrop-filter: blur(12px);
}
.discover-nav {
    width: min(1480px, 100%);
    height: 100%;
    margin: 0 auto;
    padding: 0 28px;
    display: flex;
    align-items: center;
    gap: 28px;
}
.discover-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 750;
    white-space: nowrap;
}
.discover-brand-mark { display: grid; grid-template-columns: repeat(2, 7px); gap: 3px; }
.discover-brand-mark i { width: 7px; height: 7px; border-radius: 50%; }
.discover-brand-mark i:nth-child(1) { background: #4285f4; }
.discover-brand-mark i:nth-child(2) { background: #ea4335; }
.discover-brand-mark i:nth-child(3) { background: #fbbc04; }
.discover-brand-mark i:nth-child(4) { background: #34a853; }
.discover-links { align-self: stretch; display: flex; align-items: stretch; gap: 26px; }
.discover-links a {
    position: relative;
    display: inline-flex;
    align-items: center;
    color: var(--discover-muted);
    font-size: 14px;
    font-weight: 700;
}
.discover-links a:hover,
.discover-links a.active { color: var(--discover-ink); }
.discover-links a.active::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--discover-blue);
}
.discover-nav-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.discover-button {
    min-height: 40px;
    padding: 0 17px;
    border: 1px solid var(--discover-line);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #fff;
    color: #3c4043;
    font-weight: 700;
    transition: background .16s ease, border-color .16s ease, box-shadow .16s ease;
}
.discover-button:hover { background: #f8f9fa; box-shadow: 0 2px 6px rgba(60, 64, 67, .14); }
.discover-button.primary { border-color: var(--discover-blue); background: var(--discover-blue); color: #fff; }
.discover-button.primary:hover { background: #1765cc; }
.discover-button.danger { border-color: #f4b7b5; background: #fff; color: var(--discover-red); }
.discover-button.ghost { border-color: transparent; background: transparent; box-shadow: none; }
.discover-button.small { min-height: 34px; padding: 0 12px; font-size: 13px; }
.discover-button:disabled { cursor: not-allowed; opacity: .56; box-shadow: none; }

.discover-main { width: min(1260px, calc(100% - 48px)); margin: 0 auto; padding: 44px 0 68px; }
.discover-hero {
    position: relative;
    overflow: hidden;
    min-height: 245px;
    padding: 46px;
    border: 1px solid #d5e2fb;
    border-radius: 22px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, .55fr);
    align-items: center;
    gap: 40px;
    background: linear-gradient(135deg, #fff 0%, #edf4ff 66%, #e6f4ea 100%);
    box-shadow: var(--discover-shadow);
}
.discover-hero::after {
    content: "";
    position: absolute;
    right: -70px;
    bottom: -100px;
    width: 280px;
    height: 280px;
    border: 40px solid rgba(26, 115, 232, .09);
    border-radius: 50%;
}
.discover-kicker { margin-bottom: 15px; color: var(--discover-blue); font-size: 14px; font-weight: 750; }
.discover-hero h1 { margin: 0 0 16px; font-size: clamp(36px, 5vw, 58px); line-height: 1.08; font-weight: 560; }
.discover-hero p { max-width: 720px; margin: 0; color: #3c4043; font-size: 18px; line-height: 1.75; }
.discover-hero-note {
    position: relative;
    z-index: 1;
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, .86);
    border-radius: 16px;
    background: rgba(255, 255, 255, .72);
    box-shadow: 0 10px 30px rgba(26, 115, 232, .08);
}
.discover-hero-note strong { display: block; margin-bottom: 10px; font-size: 18px; }
.discover-hero-note span { display: block; color: var(--discover-muted); line-height: 1.65; }

.discover-toolbar {
    margin: 28px 0 18px;
    padding: 14px;
    border: 1px solid var(--discover-line);
    border-radius: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: #fff;
}
.discover-search { position: relative; flex: 1; }
.discover-search input,
.discover-field input,
.discover-field textarea,
.discover-field select,
.discover-comment-box textarea {
    width: 100%;
    border: 1px solid var(--discover-line);
    border-radius: 9px;
    outline: none;
    background: #fff;
    color: var(--discover-ink);
}
.discover-search input { min-height: 44px; padding: 0 16px; }
.discover-search input:focus,
.discover-field input:focus,
.discover-field textarea:focus,
.discover-field select:focus,
.discover-comment-box textarea:focus { border-color: var(--discover-blue); box-shadow: 0 0 0 3px rgba(26, 115, 232, .12); }
.discover-filter { min-height: 44px; padding: 0 34px 0 13px; border: 1px solid var(--discover-line); border-radius: 9px; background: #fff; }

.discover-content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 22px; align-items: start; }
.discover-list { display: grid; gap: 14px; }
.discover-card {
    padding: 24px;
    border: 1px solid var(--discover-line);
    border-radius: 15px;
    background: #fff;
    box-shadow: 0 2px 7px rgba(60, 64, 67, .05);
    transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease;
}
.discover-card:hover { border-color: #b7cdf5; box-shadow: 0 10px 24px rgba(60, 64, 67, .11); transform: translateY(-1px); }
.discover-card-button { width: 100%; padding: 0; border: 0; text-align: left; background: transparent; color: inherit; }
.discover-card-meta,
.discover-article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; color: var(--discover-muted); font-size: 13px; }
.discover-chip { padding: 4px 9px; border-radius: 999px; background: var(--discover-blue-soft); color: var(--discover-blue-strong); font-weight: 700; }
.discover-card h2 { margin: 13px 0 9px; font-size: 23px; line-height: 1.35; }
.discover-card p { margin: 0; color: #4f545a; line-height: 1.75; }
.discover-tags { margin-top: 15px; display: flex; flex-wrap: wrap; gap: 7px; }
.discover-tag { color: var(--discover-muted); font-size: 13px; }
.discover-empty,
.discover-loading {
    min-height: 220px;
    padding: 46px;
    border: 1px dashed #c9ced6;
    border-radius: 15px;
    display: grid;
    place-items: center;
    text-align: center;
    color: var(--discover-muted);
    background: rgba(255, 255, 255, .68);
}
.discover-side {
    position: sticky;
    top: 92px;
    padding: 24px;
    border: 1px solid var(--discover-line);
    border-radius: 15px;
    background: #fff;
}
.discover-side h2 { margin: 0 0 14px; font-size: 18px; }
.discover-side p { margin: 0; color: var(--discover-muted); line-height: 1.7; }
.discover-principles { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.discover-principles li { padding-top: 12px; border-top: 1px solid #edf0f3; display: grid; grid-template-columns: 24px 1fr; gap: 9px; line-height: 1.5; }
.discover-principles b { color: var(--discover-blue); }
.discover-load-more { margin-top: 18px; display: flex; justify-content: center; }

.discover-reader { padding: 30px; border: 1px solid var(--discover-line); border-radius: 16px; background: #fff; }
.discover-back { margin-bottom: 24px; }
.discover-reader h1 { margin: 15px 0 15px; font-size: clamp(30px, 4vw, 45px); line-height: 1.25; }
.discover-article-summary { margin: 0 0 24px; padding: 18px 20px; border-left: 4px solid var(--discover-blue); background: var(--discover-panel); color: #3c4043; line-height: 1.75; }
.discover-article-body { padding-top: 25px; border-top: 1px solid #edf0f3; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 17px; line-height: 1.95; }
.discover-reader-actions { margin-top: 30px; padding-top: 18px; border-top: 1px solid #edf0f3; display: flex; flex-wrap: wrap; gap: 10px; }
.discover-comments { margin-top: 24px; padding: 28px; border: 1px solid var(--discover-line); border-radius: 16px; background: #fff; }
.discover-comments-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.discover-comments h2 { margin: 0; font-size: 22px; }
.discover-comment-box { margin: 20px 0 24px; }
.discover-comment-box textarea { min-height: 110px; padding: 14px; resize: vertical; line-height: 1.65; }
.discover-comment-box footer { margin-top: 10px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.discover-comment-hint { color: var(--discover-muted); font-size: 13px; }
.discover-comment-list { display: grid; gap: 12px; }
.discover-comment { padding: 16px 0; border-top: 1px solid #edf0f3; }
.discover-comment:first-child { border-top: 0; }
.discover-comment-head { margin-bottom: 8px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.discover-comment-author { font-weight: 750; }
.discover-comment-time { color: var(--discover-muted); font-size: 12px; }
.discover-comment-body { white-space: pre-wrap; overflow-wrap: anywhere; color: #3c4043; line-height: 1.7; }

.discover-toast {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: 80;
    max-width: min(420px, calc(100vw - 44px));
    padding: 13px 17px;
    border-radius: 10px;
    background: #202124;
    color: #fff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .22);
}
.discover-toast.error { background: #8c1d18; }

/* Administrator workspace */
.discover-admin-main { width: min(1480px, calc(100% - 40px)); margin: 0 auto; padding: 28px 0 56px; }
.discover-admin-head { margin-bottom: 20px; display: flex; align-items: end; justify-content: space-between; gap: 18px; }
.discover-admin-head h1 { margin: 0 0 7px; font-size: 32px; }
.discover-admin-head p { margin: 0; color: var(--discover-muted); }
.discover-stat-grid { margin-bottom: 20px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.discover-stat { padding: 17px 18px; border: 1px solid var(--discover-line); border-radius: 12px; background: #fff; }
.discover-stat span { display: block; color: var(--discover-muted); font-size: 13px; }
.discover-stat strong { display: block; margin-top: 7px; font-size: 25px; }
.discover-admin-tabs { margin-bottom: 16px; padding: 5px; border: 1px solid var(--discover-line); border-radius: 10px; display: inline-flex; gap: 4px; background: #fff; }
.discover-admin-tab { min-height: 36px; padding: 0 15px; border: 0; border-radius: 7px; background: transparent; color: var(--discover-muted); font-weight: 700; }
.discover-admin-tab.active { background: var(--discover-blue-soft); color: var(--discover-blue-strong); }
.discover-admin-grid { display: grid; grid-template-columns: 390px minmax(0, 1fr); gap: 18px; align-items: start; }
.discover-admin-panel { border: 1px solid var(--discover-line); border-radius: 14px; background: #fff; overflow: hidden; }
.discover-admin-panel-head { min-height: 62px; padding: 14px 18px; border-bottom: 1px solid var(--discover-line); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.discover-admin-panel-head h2 { margin: 0; font-size: 18px; }
.discover-admin-list { max-height: calc(100vh - 280px); overflow: auto; }
.discover-admin-item { width: 100%; padding: 16px 18px; border: 0; border-bottom: 1px solid #edf0f3; display: block; text-align: left; background: #fff; color: inherit; }
.discover-admin-item:hover,
.discover-admin-item.active { background: #f4f8ff; }
.discover-admin-item strong { display: block; margin-bottom: 8px; font-size: 15px; line-height: 1.4; }
.discover-admin-item-meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--discover-muted); font-size: 12px; }
.discover-status { padding: 3px 8px; border-radius: 999px; font-weight: 700; }
.discover-status.draft { background: #fef7e0; color: var(--discover-amber); }
.discover-status.published { background: #e6f4ea; color: var(--discover-green); }
.discover-status.withdrawn { background: #f1f3f4; color: var(--discover-muted); }
.discover-editor { padding: 22px; }
.discover-form-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.discover-field { display: grid; gap: 7px; }
.discover-field.wide { grid-column: 1 / -1; }
.discover-field label { font-size: 13px; font-weight: 750; }
.discover-field input,
.discover-field select { min-height: 44px; padding: 0 12px; }
.discover-field textarea { min-height: 94px; padding: 12px; resize: vertical; line-height: 1.65; }
.discover-field textarea.article-content { min-height: 360px; }
.discover-field-note { color: var(--discover-muted); font-size: 12px; line-height: 1.5; }
.discover-editor-actions { margin-top: 20px; padding-top: 17px; border-top: 1px solid #edf0f3; display: flex; flex-wrap: wrap; gap: 10px; }
.discover-editor-actions .danger { margin-left: auto; }
.discover-comment-admin-list { padding: 10px 18px 20px; display: grid; gap: 10px; }
.discover-comment-admin { padding: 15px; border: 1px solid #e5e8ec; border-radius: 10px; }
.discover-comment-admin.hidden-comment { background: #f8f9fa; opacity: .8; }
.discover-comment-admin p { margin: 9px 0 12px; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.65; }
.discover-comment-admin footer { display: flex; flex-wrap: wrap; gap: 8px; }
.discover-access-denied { min-height: 58vh; display: grid; place-items: center; }
.discover-access-card { max-width: 520px; padding: 42px; border: 1px solid var(--discover-line); border-radius: 16px; text-align: center; background: #fff; box-shadow: var(--discover-shadow); }
.discover-access-card h1 { margin: 0 0 12px; }
.discover-access-card p { color: var(--discover-muted); line-height: 1.7; }

@media (max-width: 980px) {
    .discover-links { display: none; }
    .discover-main { width: min(100% - 28px, 760px); padding-top: 24px; }
    .discover-hero { padding: 32px; grid-template-columns: 1fr; gap: 26px; }
    .discover-content-grid { grid-template-columns: 1fr; }
    .discover-side { position: static; }
    .discover-admin-grid { grid-template-columns: 1fr; }
    .discover-admin-list { max-height: 340px; }
    .discover-stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
    .discover-header { height: 60px; }
    .discover-nav { padding: 0 14px; gap: 10px; }
    .discover-brand { font-size: 16px; }
    .discover-nav-actions .discover-button { min-height: 36px; padding: 0 11px; font-size: 12px; }
    .discover-hero { padding: 25px 22px; border-radius: 15px; }
    .discover-hero p { font-size: 16px; }
    .discover-toolbar { align-items: stretch; flex-direction: column; }
    .discover-content-grid { gap: 14px; }
    .discover-card,
    .discover-reader,
    .discover-comments { padding: 20px; }
    .discover-comment-box footer { align-items: stretch; flex-direction: column; }
    .discover-admin-main { width: min(100% - 24px, 760px); }
    .discover-admin-head { align-items: stretch; flex-direction: column; }
    .discover-stat-grid { grid-template-columns: 1fr 1fr; }
    .discover-form-grid { grid-template-columns: 1fr; }
    .discover-field.wide { grid-column: auto; }
    .discover-editor-actions .danger { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}