:root {
    --red-900: #5b121f;
    --red-700: #7b1e2b;
    --red-600: #982e3e;
    --red-100: #f7e9eb;
    --gold: #c79a46;
    --ink: #24252a;
    --muted: #6d6f78;
    --line: #e6e2de;
    --paper: #fffdf9;
    --paper-soft: #f7f4ef;
    --success: #24734d;
    --danger: #b42332;
    --warning: #8a601a;
    --admin-bg: #f1f3f6;
    --admin-ink: #222b38;
    --shadow: 0 18px 48px rgba(52, 33, 30, .11);
    --radius: 18px;
    color-scheme: light;
    font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { min-width: 320px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; color: var(--ink); background: var(--paper-soft); line-height: 1.65; }
button, input, textarea, select { font: inherit; }
button, a, input, textarea, select { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
img { display: block; max-width: 100%; }
audio { display: block; width: 100%; max-width: 440px; min-height: 44px; }
code { padding: .1em .35em; border-radius: 5px; background: #eeeae4; word-break: break-all; }

.skip-link { position: fixed; z-index: 1000; top: 8px; left: 8px; padding: 10px 14px; color: white; background: var(--ink); border-radius: 8px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.public-board { position: relative; isolation: isolate; background: #efeae3; }
.public-board::before { content: ""; position: fixed; z-index: -2; inset: 0; background: #efeae3 url('/background.php') center / cover no-repeat; }
.public-board::after { content: ""; position: fixed; z-index: -1; inset: 0; background: rgba(250, 247, 241, .83); backdrop-filter: blur(2px); }
.site-header { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid rgba(91, 18, 31, .1); background: rgba(255, 253, 249, .9); backdrop-filter: blur(16px); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; width: min(1120px, calc(100% - 40px)); min-height: 68px; margin: auto; }
.brand, .admin-brand { display: inline-flex; align-items: center; gap: 11px; color: var(--red-900); font-size: 18px; font-weight: 750; text-decoration: none; }
.brand__seal { display: inline-grid; flex: 0 0 38px; width: 38px; height: 38px; place-items: center; color: #fff; background: linear-gradient(145deg, var(--red-600), var(--red-900)); border: 2px solid rgba(199, 154, 70, .8); border-radius: 10px; box-shadow: 0 7px 16px rgba(91, 18, 31, .18); }
.brand--center { justify-content: center; }
.header-link, .back-link { color: var(--red-700); font-weight: 650; text-decoration: none; }
.header-link { display: grid; min-height: 44px; padding: 0 8px; place-items: center; }
.page-shell { width: min(920px, calc(100% - 40px)); margin: 34px auto 80px; }
.panel { border: 1px solid rgba(105, 87, 72, .13); background: rgba(255, 253, 249, .95); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero { position: relative; overflow: hidden; padding: 52px; text-align: center; }
.hero::before, .hero::after { content: ""; position: absolute; width: 120px; height: 120px; border: 1px solid rgba(123, 30, 43, .11); transform: rotate(45deg); }
.hero::before { top: -78px; left: -25px; }
.hero::after { right: -25px; bottom: -78px; }
.hero h1 { margin: 4px 0 8px; color: var(--red-900); font-family: Georgia, "Songti SC", "SimSun", serif; font-size: clamp(34px, 7vw, 58px); line-height: 1.2; letter-spacing: .08em; }
.hero p:last-child { margin: 0; color: var(--muted); }
.eyebrow { margin: 0 0 5px; color: var(--gold); font-size: 11px; font-weight: 800; letter-spacing: .24em; }
.composer { margin-top: 24px; padding: 32px; }
.section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 25px; }
.section-heading h2, .admin-panel h2 { margin: 0; font-size: 24px; line-height: 1.3; }
.section-heading--outside { align-items: end; margin: 54px 4px 20px; }
.status-pill, .message-total, .badge { display: inline-flex; align-items: center; min-height: 30px; padding: 3px 11px; border-radius: 999px; font-size: 12px; font-weight: 700; white-space: nowrap; }
.status-pill { color: var(--warning); background: #fff3d9; }
.message-total { color: var(--muted); background: rgba(255, 255, 255, .72); }
.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 20px; }
.field label, fieldset legend { font-weight: 700; }
.field input, .field textarea, .field select, .admin-form input, .admin-form textarea, .admin-form select, .install-card input, .install-card select, .login-card input { width: 100%; min-height: 48px; padding: 11px 13px; color: var(--ink); background: #fff; border: 1px solid #d9d5cf; border-radius: 10px; outline: none; transition: border-color .15s, box-shadow .15s; }
.field textarea { min-height: 132px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus, .admin-form input:focus, .admin-form select:focus, .install-card input:focus, .install-card select:focus, .login-card input:focus { border-color: var(--red-600); box-shadow: 0 0 0 3px rgba(152, 46, 62, .12); }
.label-row { display: flex; align-items: end; justify-content: space-between; gap: 10px; }
.label-row > span { color: var(--muted); font-size: 12px; }
.label-row > span.is-near-limit { color: var(--danger); font-weight: 700; }
.optional, .field-help, .field small, .admin-panel__heading p, .muted { color: var(--muted); font-size: 13px; font-weight: 400; }
.voice-box, .stacked-form fieldset { min-width: 0; margin: 4px 0 24px; padding: 20px; border: 1px solid var(--line); border-radius: 13px; }
.voice-box legend, .stacked-form legend { padding: 0 8px; }
.recorder { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 15px 0; }
.record-time { min-width: 54px; color: var(--muted); font-variant-numeric: tabular-nums; font-weight: 700; }
.record-dot { width: 10px; height: 10px; background: var(--danger); border-radius: 50%; }
.is-recording .record-dot { animation: pulse 1.1s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 7px rgba(180, 35, 50, .13); opacity: .65; } }
#audio-file { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }
.file-label { display: inline-flex; align-items: center; min-height: 44px; margin-top: 13px; padding: 8px 12px; color: var(--red-700); border: 1px dashed #c8aaa9; border-radius: 9px; cursor: pointer; }
.field-error { color: var(--danger) !important; font-weight: 650 !important; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 9px 17px; border: 1px solid transparent; border-radius: 10px; cursor: pointer; font-weight: 720; line-height: 1.3; text-align: center; text-decoration: none; transition: transform .12s, box-shadow .12s, background .12s; }
.button:hover { transform: translateY(-1px); }
.button:focus-visible { outline: 3px solid rgba(152, 46, 62, .28); outline-offset: 2px; }
.button:disabled { cursor: wait; opacity: .65; transform: none; }
.button--primary { color: white; background: linear-gradient(145deg, var(--red-600), var(--red-900)); box-shadow: 0 8px 18px rgba(91, 18, 31, .18); }
.button--secondary { color: var(--red-700); background: #fff; border-color: #d9c7c7; }
.button--ghost { color: var(--muted); background: transparent; border-color: var(--line); }
.button--danger { color: var(--danger); background: #fff1f2; border-color: #f3c5ca; }
.button--approve { color: #fff; background: var(--success); }
.button--wide { width: 100%; }
.message-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.message-card { min-width: 0; padding: 24px; }
.message-card__header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.message-card h3 { margin: 0; font-size: 16px; line-height: 1.3; }
.message-card time, .compact-item time, .admin-message-card time { display: block; color: var(--muted); font-size: 12px; }
.avatar { display: inline-grid; flex: 0 0 44px; width: 44px; height: 44px; place-items: center; color: var(--red-900); background: var(--red-100); border-radius: 50%; font-weight: 800; }
.avatar--small { flex-basis: 38px; width: 38px; height: 38px; }
.message-content { margin: 0; overflow-wrap: anywhere; white-space: normal; }
.audio-wrap { margin-top: 17px; padding: 12px; background: #f5f1eb; border-radius: 11px; }
.audio-label { display: block; margin-bottom: 6px; color: var(--muted); font-size: 12px; font-weight: 700; }
.empty-state { padding: 55px 20px; color: var(--muted); text-align: center; }
.empty-state__icon { color: var(--gold); font-size: 34px; }
.pagination { display: flex; align-items: center; justify-content: center; gap: 15px; margin-top: 28px; }
.site-footer { padding: 24px max(20px, env(safe-area-inset-right)) calc(24px + env(safe-area-inset-bottom)); color: var(--muted); text-align: center; }
.alert { margin: 0 0 18px; padding: 13px 15px; border: 1px solid; border-radius: 10px; overflow-wrap: anywhere; }
.alert--success { color: #175d3c; background: #eaf8f0; border-color: #b9e1c9; }
.alert--error { color: #8d1825; background: #fff0f1; border-color: #edbdc2; }
.alert--warning { color: #735016; background: #fff7df; border-color: #ead49b; }

/* 安装与登录 */
.install-page, .login-page { background: radial-gradient(circle at top, #f9eee8, #eceff3 55%, #e7e9ed); }
.install-shell, .login-shell { display: grid; min-height: 100vh; padding: 32px 20px calc(32px + env(safe-area-inset-bottom)); place-items: center; }
.install-card { width: min(680px, 100%); padding: 34px; }
.login-card { width: min(430px, 100%); padding: 36px; }
.install-card h1, .login-card h1 { margin: 22px 0 8px; text-align: center; }
.install-card > p { color: var(--muted); text-align: center; }
.center { text-align: center; }
.back-link { display: block; min-height: 44px; margin-top: 18px; padding: 9px; text-align: center; }

/* 后台 */
.admin-page { color: var(--admin-ink); background: var(--admin-bg); }
.admin-topbar { position: fixed; z-index: 50; top: 0; right: 0; left: 0; display: flex; align-items: center; justify-content: space-between; height: 68px; padding: 0 24px; color: #fff; background: var(--admin-ink); box-shadow: 0 3px 18px rgba(10, 18, 29, .18); }
.admin-brand { color: #fff; }
.admin-brand .brand__seal { flex-basis: 36px; width: 36px; height: 36px; }
.admin-account { display: flex; align-items: center; gap: 18px; font-size: 13px; }
.admin-account a { color: #ccd4df; text-decoration: none; }
.admin-layout { display: grid; grid-template-columns: 232px minmax(0, 1fr); min-height: 100vh; padding-top: 68px; }
.admin-sidebar { position: fixed; top: 68px; bottom: 0; left: 0; display: flex; width: 232px; flex-direction: column; justify-content: space-between; padding: 24px 15px calc(20px + env(safe-area-inset-bottom)); background: #fff; border-right: 1px solid #e1e5ea; }
.admin-sidebar nav { display: grid; gap: 6px; }
.admin-sidebar nav a { min-height: 46px; padding: 11px 14px; border-radius: 9px; color: #555f6e; font-weight: 650; text-decoration: none; }
.admin-sidebar nav a:hover { background: #f4f5f7; }
.admin-sidebar nav a[aria-current="page"] { color: var(--red-700); background: var(--red-100); }
.admin-main { grid-column: 2; width: min(1180px, 100%); min-width: 0; padding: 34px 38px 70px; }
.admin-title-row { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 26px; }
.admin-title-row h1 { margin: 0; font-size: 30px; line-height: 1.2; }
.mobile-admin-nav { display: none; position: relative; }
.stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { display: flex; min-width: 0; min-height: 145px; padding: 20px; flex-direction: column; color: var(--admin-ink); background: #fff; border: 1px solid #e1e5ea; border-radius: 14px; box-shadow: 0 8px 28px rgba(30, 42, 59, .05); text-decoration: none; }
.stat-card span { color: var(--muted); font-weight: 650; }
.stat-card strong { margin: 4px 0 auto; font-size: 38px; line-height: 1.25; }
.stat-card small { color: #9298a2; }
.stat-card--attention { color: #fff; background: linear-gradient(145deg, var(--red-600), var(--red-900)); border-color: transparent; }
.stat-card--attention span, .stat-card--attention small { color: rgba(255, 255, 255, .78); }
.admin-panel { margin-bottom: 22px; padding: 24px; background: #fff; border: 1px solid #e1e5ea; border-radius: 14px; box-shadow: 0 8px 28px rgba(30, 42, 59, .045); }
.admin-panel--flush { padding: 0; overflow: hidden; }
.admin-panel__heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.admin-panel__heading p { margin: 5px 0 0; }
.admin-panel__heading a { min-height: 44px; color: var(--red-700); font-weight: 650; text-decoration: none; }
.compact-list { display: grid; }
.compact-item { display: grid; grid-template-columns: 38px minmax(0, 1fr) auto 110px; align-items: center; gap: 13px; min-height: 70px; padding: 10px 3px; border-top: 1px solid #eef0f2; text-decoration: none; }
.compact-item__body { min-width: 0; }
.compact-item__body strong, .compact-item__body small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.compact-item__body small { color: var(--muted); }
.badge--pending { color: #86601f; background: #fff3d6; }
.badge--approved { color: #1b6944; background: #e6f6ed; }
.badge--rejected { color: #8e2833; background: #fdebed; }
.admin-empty { padding: 56px 20px; color: var(--muted); text-align: center; }
.filter-tabs { display: flex; gap: 8px; margin-bottom: 16px; overflow-x: auto; scrollbar-width: thin; }
.filter-tabs a { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 7px; min-height: 44px; padding: 8px 14px; background: #fff; border: 1px solid #e1e5ea; border-radius: 10px; color: #626b77; text-decoration: none; }
.filter-tabs a span { display: grid; min-width: 22px; height: 22px; padding: 0 6px; place-items: center; background: #eef0f3; border-radius: 999px; font-size: 11px; }
.filter-tabs a[aria-current="page"] { color: #fff; background: var(--admin-ink); border-color: var(--admin-ink); }
.filter-tabs a[aria-current="page"] span { background: rgba(255, 255, 255, .14); }
.message-admin-list { display: grid; }
.admin-message-card { display: grid; grid-template-columns: minmax(180px, 240px) minmax(240px, 1fr) auto; gap: 20px; padding: 22px 24px; border-bottom: 1px solid #e9ecef; }
.admin-message-card:last-child { border-bottom: 0; }
.admin-message-card__meta { display: grid; grid-template-columns: 38px minmax(0, 1fr); align-items: center; gap: 10px; }
.admin-message-card__meta .badge { grid-column: 2; justify-self: start; }
.admin-message-card__content { min-width: 0; overflow-wrap: anywhere; }
.admin-message-card__content p { margin: 0 0 12px; white-space: normal; }
.admin-message-card__actions { display: flex; flex-wrap: wrap; align-content: center; justify-content: flex-end; gap: 8px; }
.admin-message-card__actions .button { min-height: 42px; padding: 8px 12px; }
.admin-pagination { margin-bottom: 20px; }
.form-section { padding: 26px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 18px; }
.field--full { grid-column: 1 / -1; }
.toggle-list { display: grid; gap: 10px; margin-top: 8px; }
.toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 72px; padding: 12px 14px; border: 1px solid #e4e7eb; border-radius: 11px; cursor: pointer; }
.toggle-row span strong, .toggle-row span small { display: block; }
.toggle-row span small { color: var(--muted); }
.toggle-row input { position: absolute; opacity: 0; pointer-events: none; }
.toggle-row i { position: relative; flex: 0 0 48px; width: 48px; height: 28px; background: #bbc0c8; border-radius: 999px; transition: background .15s; }
.toggle-row i::after { content: ""; position: absolute; top: 4px; left: 4px; width: 20px; height: 20px; background: #fff; border-radius: 50%; box-shadow: 0 2px 5px rgba(0, 0, 0, .18); transition: transform .15s; }
.toggle-row input:checked + i { background: var(--success); }
.toggle-row input:checked + i::after { transform: translateX(20px); }
.toggle-row input:focus-visible + i { outline: 3px solid rgba(36, 115, 77, .22); outline-offset: 2px; }
.check-row { display: flex; align-items: flex-start; gap: 10px; min-height: 44px; cursor: pointer; }
.check-row input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--red-700); }
.background-preview { overflow: hidden; width: min(560px, 100%); margin-bottom: 20px; aspect-ratio: 16 / 7; background: #eee; border-radius: 12px; }
.background-preview img { width: 100%; height: 100%; object-fit: cover; }
.form-actions, .sticky-save { display: flex; justify-content: flex-end; gap: 10px; }
.sticky-save { position: sticky; z-index: 10; bottom: max(12px, env(safe-area-inset-bottom)); margin: 0 0 24px; padding: 12px; background: rgba(241, 243, 246, .9); border: 1px solid #dfe3e8; border-radius: 12px; backdrop-filter: blur(12px); }
.narrow-form { max-width: 560px; }

@media (max-width: 1050px) {
    .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .admin-message-card { grid-template-columns: minmax(170px, 220px) 1fr; }
    .admin-message-card__actions { grid-column: 1 / -1; justify-content: flex-start; padding-left: 48px; }
}

@media (max-width: 860px) {
    .admin-account, .admin-sidebar { display: none; }
    .admin-layout { display: block; }
    .admin-main { width: 100%; padding: 25px 20px calc(70px + env(safe-area-inset-bottom)); }
    .mobile-admin-nav { display: block; }
    .mobile-admin-nav summary { display: grid; min-width: 64px; min-height: 44px; padding: 8px 12px; place-items: center; border: 1px solid #4c5664; border-radius: 9px; cursor: pointer; list-style: none; }
    .mobile-admin-nav summary::-webkit-details-marker { display: none; }
    .mobile-admin-nav nav { position: absolute; top: 51px; right: 0; display: grid; width: min(280px, calc(100vw - 32px)); padding: 8px; color: var(--admin-ink); background: #fff; border: 1px solid #dde1e6; border-radius: 12px; box-shadow: 0 20px 50px rgba(20, 29, 42, .2); }
    .mobile-admin-nav nav a, .mobile-admin-nav nav button { display: flex; width: 100%; min-height: 46px; align-items: center; padding: 10px 12px; color: var(--admin-ink); background: transparent; border: 0; border-radius: 8px; font-weight: 650; text-decoration: none; }
    .mobile-admin-nav nav a[aria-current="page"] { color: var(--red-700); background: var(--red-100); }
    .mobile-admin-nav nav button { color: var(--danger); cursor: pointer; }
}

@media (max-width: 680px) {
    .site-header__inner, .page-shell { width: min(100% - 28px, 920px); }
    .site-header__inner { min-height: 62px; }
    .brand { font-size: 16px; }
    .brand__seal { flex-basis: 34px; width: 34px; height: 34px; border-radius: 8px; }
    .page-shell { margin-top: 18px; }
    .hero { padding: 40px 20px; }
    .hero h1 { letter-spacing: .04em; }
    .composer { margin-top: 14px; padding: 20px 16px; }
    .section-heading { align-items: flex-start; margin-bottom: 20px; }
    .section-heading h2 { font-size: 21px; }
    .status-pill { white-space: normal; text-align: center; }
    .voice-box { padding: 16px 13px; }
    .recorder { display: grid; grid-template-columns: 1fr auto; }
    .recorder .button:first-child { width: 100%; }
    .recorder .button[hidden] { display: none; }
    #discard-recording { grid-column: 1 / -1; }
    .message-grid { grid-template-columns: 1fr; gap: 13px; }
    .message-card { padding: 20px 17px; }
    .section-heading--outside { margin-top: 38px; }
    .pagination { justify-content: space-between; gap: 8px; }
    .pagination .button { padding-right: 12px; padding-left: 12px; }
    .install-shell, .login-shell { padding: 14px 12px calc(18px + env(safe-area-inset-bottom)); align-items: start; }
    .install-card, .login-card { padding: 25px 17px; border-radius: 15px; }
    .form-grid { grid-template-columns: 1fr; }
    .field--full { grid-column: auto; }
    .admin-topbar { height: 62px; padding: 0 max(14px, env(safe-area-inset-left)) 0 max(14px, env(safe-area-inset-right)); }
    .admin-layout { padding-top: 62px; }
    .admin-main { padding: 22px 13px calc(68px + env(safe-area-inset-bottom)); }
    .admin-title-row { margin-bottom: 20px; }
    .admin-title-row h1 { font-size: 26px; }
    .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
    .stat-card { min-height: 125px; padding: 15px; }
    .stat-card strong { font-size: 31px; }
    .admin-panel, .form-section { padding: 18px 14px; border-radius: 12px; }
    .admin-panel--flush { padding: 0; }
    .compact-item { grid-template-columns: 38px minmax(0, 1fr) auto; }
    .compact-item time { display: none; }
    .filter-tabs { margin-right: -13px; padding-right: 13px; }
    .admin-message-card { display: block; padding: 18px 14px; }
    .admin-message-card__meta { grid-template-columns: 38px minmax(0, 1fr) auto; }
    .admin-message-card__meta .badge { grid-column: 3; grid-row: 1; }
    .admin-message-card__content { margin: 16px 0; padding: 13px; background: #f7f8fa; border-radius: 10px; }
    .admin-message-card__actions { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding-left: 0; }
    .admin-message-card__actions form, .admin-message-card__actions .button { width: 100%; }
    .toggle-row { align-items: flex-start; padding: 13px 11px; }
    .toggle-row i { margin-top: 2px; }
    .form-actions { display: grid; grid-template-columns: 1fr; }
    .form-actions .button, .sticky-save .button { width: 100%; }
    .sticky-save { padding: 8px; }
}

@media (max-width: 390px) {
    .header-link { font-size: 13px; }
    .section-heading { display: block; }
    .section-heading .status-pill { margin-top: 10px; }
    .section-heading--outside { display: flex; }
    .stat-grid { grid-template-columns: 1fr 1fr; }
    .stat-card small { display: none; }
    .admin-message-card__actions { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}