/* ===== 启课 · 教学管理工作台 样式表 ===== */
/* 设计语言：简洁、留白、清晰层级；主色鲜明，强调色克制使用 */

* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

:root {
    --primary: #165dff;
    --primary-hover: #0b45d6;
    --primary-rgb: 22, 93, 255;
    --primary-soft: #eef4ff;
    --hero-1: #0a2fb0;
    --hero-2: #165dff;
    --hero-3: #4d8bff;

    --bg: #f2f6fd;
    --bg-soft: #e9f0fb;
    --card: #ffffff;
    --text: #10151f;
    --text-2: #43506b;
    --text-3: #8a94a6;
    --line: #e8ecf2;
    --line-strong: #d6dde7;

    --danger: #f53f3f;
    --danger-soft: #fff1f0;
    --warning: #ff7d00;
    --warning-soft: #fff7e8;
    --success: #00b42a;
    --success-soft: #e9ffef;

    --sidebar-bg: #ffffff;
    --brand-text: #ffffff;
    --brand-text-dim: rgba(255, 255, 255, .68);
    --brand-line: rgba(255, 255, 255, .14);
    --brand-box: rgba(255, 255, 255, .08);

    --sidebar-w: 244px;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 2px rgba(16, 21, 31, .04), 0 8px 24px rgba(16, 21, 31, .04);
    --shadow-hover: 0 2px 6px rgba(16, 21, 31, .06), 0 16px 40px rgba(16, 21, 31, .07);
    --font: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Inter", system-ui, sans-serif;
}

body[data-theme="violet"] {
    --bg: #f6f2fd;
    --bg-soft: #eee7fc;
    --primary: #6d3bf5;
    --primary-hover: #5a2bd8;
    --primary-rgb: 109, 59, 245;
    --primary-soft: #f2edff;
    --hero-1: #2c1370;
    --hero-2: #6d3bf5;
    --hero-3: #9d7bff;
}

body[data-theme="coral"] {
    --bg: #fdf5f1;
    --bg-soft: #fbe9e1;
    --primary: #ff5a2c;
    --primary-hover: #e8451a;
    --primary-rgb: 255, 90, 44;
    --primary-soft: #fff1eb;
    --hero-1: #7d2408;
    --hero-2: #ff5a2c;
    --hero-3: #ff9a75;
}

body[data-theme="teal"] {
    --bg: #edf9f8;
    --bg-soft: #e1f4f3;
    --primary: #00b2a9;
    --primary-hover: #00948d;
    --primary-rgb: 0, 178, 169;
    --primary-soft: #e6faf8;
    --hero-1: #014b48;
    --hero-2: #00b2a9;
    --hero-3: #57d9d1;
}

body[data-theme="green"] {
    --bg: #effaf4;
    --bg-soft: #e4f5ec;
    --primary: #0fa968;
    --primary-hover: #0b8f57;
    --primary-rgb: 15, 169, 104;
    --primary-soft: #e9faf1;
    --hero-1: #06432b;
    --hero-2: #0fa968;
    --hero-3: #4fd39b;
}

body[data-theme="gray"] {
    --bg: #f4f5f7;
    --bg-soft: #e9ebf1;
    --primary: #2b3445;
    --primary-hover: #1a2230;
    --primary-rgb: 43, 52, 69;
    --primary-soft: #eef1f5;
    --hero-1: #0d1219;
    --hero-2: #2b3445;
    --hero-3: #566274;
}

/* 系统白：纯白内容区 + 系统蓝点缀，最接近系统原生观感 */
body[data-theme="white"] {
    --bg: #ffffff;
    --bg-soft: #f5f6f8;
    --primary: #0071e3;
    --primary-hover: #005ec2;
    --primary-rgb: 0, 113, 227;
    --primary-soft: #eaf4ff;
    --sidebar-bg: #f8f9fb;
    --line: #e9eaee;
    --line-strong: #d8dae0;
    --text: #0d0f14;
    --text-2: #4b5262;
    --text-3: #8b90a0;
    --shadow: 0 1px 2px rgba(13, 15, 20, .05), 0 8px 20px rgba(13, 15, 20, .045);
    --shadow-hover: 0 2px 6px rgba(13, 15, 20, .07), 0 16px 36px rgba(13, 15, 20, .07);
    --hero-1: #e8ecf3;
    --hero-2: #f5f7fb;
    --hero-3: #ffffff;
    --brand-text: #0d0f14;
    --brand-text-dim: rgba(13, 15, 20, .56);
    --brand-line: rgba(13, 15, 20, .12);
    --brand-box: rgba(13, 15, 20, .035);
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }

input, select, textarea {
    width: 100%;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text);
    padding: 9px 12px;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}
input:hover, select:hover, textarea:hover { border-color: #c2cbd9; }
input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), .12);
}
input:disabled, select:disabled { background: #f5f6f8; color: var(--text-3); cursor: not-allowed; }
textarea { resize: vertical; min-height: 84px; }
input[type="checkbox"] { width: auto; }

/* 细滚动条：表格、课程表、列表内部滚动时不抢视觉 */
.week-grid, .month-grid, .table-wrap, .student-list, .participant-grid, .sidebar-nav {
    scrollbar-width: thin;
    scrollbar-color: #d3dae5 transparent;
}
.week-grid::-webkit-scrollbar, .month-grid::-webkit-scrollbar, .table-wrap::-webkit-scrollbar,
.student-list::-webkit-scrollbar, .participant-grid::-webkit-scrollbar, .sidebar-nav::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
.week-grid::-webkit-scrollbar-thumb, .month-grid::-webkit-scrollbar-thumb, .table-wrap::-webkit-scrollbar-thumb,
.student-list::-webkit-scrollbar-thumb, .participant-grid::-webkit-scrollbar-thumb, .sidebar-nav::-webkit-scrollbar-thumb {
    background: #d3dae5;
    border-radius: 99px;
}
.week-grid::-webkit-scrollbar-track, .month-grid::-webkit-scrollbar-track, .table-wrap::-webkit-scrollbar-track,
.student-list::-webkit-scrollbar-track, .participant-grid::-webkit-scrollbar-track, .sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: 0 18px;
    min-height: 40px;
    font-weight: 500;
    background: #fff;
    color: var(--text);
    transition: background .15s, border-color .15s, color .15s, box-shadow .15s, transform .15s;
    white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(var(--primary-rgb), .22);
}
.btn-primary:hover { background: var(--primary-hover); box-shadow: 0 6px 18px rgba(var(--primary-rgb), .28); }
.btn-secondary { border-color: var(--line-strong); color: var(--text-2); background: #fff; }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #d92c2c; }
.btn-danger-outline { border-color: #ffd4d2; color: var(--danger); background: #fff; }
.btn-danger-outline:hover { background: var(--danger-soft); border-color: #ffb3b0; }
.btn-text {
    border: 0;
    background: transparent;
    color: var(--primary);
    padding: 4px 8px;
    min-height: 28px;
    border-radius: 6px;
    font-weight: 500;
}
.btn-text:hover { background: var(--primary-soft); }
.btn-text.danger { color: var(--danger); }
.btn-text.danger:hover { background: var(--danger-soft); }
.btn-sm { min-height: 32px; padding: 0 12px; font-size: 13px; border-radius: 7px; }
.btn-lg { min-height: 46px; font-size: 15px; }
.btn-block { width: 100%; }

.icon-btn {
    width: 38px;
    height: 38px;
    border: 1px solid var(--line-strong);
    background: #fff;
    border-radius: 9px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-2);
    transition: all .15s;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }

[data-icon] { display: inline-flex; width: 19px; height: 19px; align-items: center; justify-content: center; flex: none; }
[data-icon] svg {
    width: 19px;
    height: 19px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ===== 品牌标记 ===== */
.brand-mark { display: flex; align-items: flex-end; gap: 3px; width: 30px; height: 30px; flex: none; }
.brand-mark span { display: block; width: 7px; border-radius: 2px; background: var(--primary); }
.brand-mark span:nth-child(1) { height: 16px; }
.brand-mark span:nth-child(2) { height: 28px; }
.brand-mark span:nth-child(3) { height: 22px; }
.brand-mark.large { width: 42px; height: 42px; }
.brand-mark.large span { width: 10px; background: var(--brand-text); }
.brand-mark.large span:nth-child(1) { height: 23px; }
.brand-mark.large span:nth-child(2) { height: 40px; }
.brand-mark.large span:nth-child(3) { height: 31px; }
.brand-mark.mobile { display: none; }

/* ===== 登录页 ===== */
.login-view {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(430px, 1.08fr) minmax(460px, 1fr);
    background: #fff;
}

.login-brand {
    background: linear-gradient(155deg, var(--hero-1) 0%, var(--hero-2) 56%, var(--hero-3) 100%);
    color: var(--brand-text);
    padding: 44px 64px 52px;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}
.login-brand:after {
    content: "";
    position: absolute;
    width: 520px;
    height: 520px;
    border: 1px solid var(--brand-line);
    border-radius: 50%;
    right: -210px;
    bottom: -170px;
    box-shadow: 0 0 0 80px var(--brand-box), 0 0 0 160px var(--brand-box);
}
.login-brand-top {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.login-logo { display: flex; align-items: center; gap: 12px; }
.login-logo-text { display: flex; flex-direction: column; line-height: 1.25; }
.login-logo-text strong { font-size: 26px; font-weight: 700; letter-spacing: 6px; }
.login-logo-text small { font-size: 12px; letter-spacing: 2px; color: var(--brand-text-dim); }

.login-clock {
    font-size: 16px;
    letter-spacing: .6px;
    color: var(--brand-text);
    font-variant-numeric: tabular-nums;
    display: flex;
    align-items: baseline;
    gap: 10px;
    flex-wrap: wrap;
}
.login-clock strong { font-weight: 600; font-size: 17px; }
.login-clock .clock-time { font-size: 19px; font-weight: 600; letter-spacing: 1px; }
.login-clock .clock-week { font-size: 14px; color: var(--brand-text-dim); }

.login-brand-copy { margin: auto 0; position: relative; z-index: 1; padding: 36px 0; }
.login-kicker {
    font-size: 13px;
    letter-spacing: 4px;
    color: var(--brand-text-dim);
    margin-bottom: 18px;
}
.login-brand h1 {
    font-size: 42px;
    line-height: 1.38;
    letter-spacing: .5px;
    font-weight: 650;
}
.login-sub {
    font-size: 15px;
    line-height: 1.9;
    color: var(--brand-text-dim);
    margin-top: 22px;
    max-width: 460px;
}

.login-brand-foot { position: relative; z-index: 1; }
.login-contact {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 18px;
    border-left: 3px solid var(--brand-line);
    background: var(--brand-box);
    border-radius: 0 10px 10px 0;
    margin-bottom: 22px;
    max-width: 480px;
}
.login-contact span {
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--brand-text-dim);
}
.login-contact strong {
    font-size: 17px;
    font-weight: 600;
    letter-spacing: .4px;
    line-height: 1.5;
}

.login-features {
    display: flex;
    gap: 30px;
    color: var(--brand-text-dim);
    font-size: 14px;
}
.login-features span:before {
    content: "";
    display: inline-block;
    width: 5px;
    height: 5px;
    background: currentColor;
    border-radius: 50%;
    margin-right: 9px;
    vertical-align: 2px;
    opacity: .8;
}

.login-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 40px;
    background: var(--bg);
}
.login-card { width: 100%; max-width: 396px; }
.login-heading { margin-bottom: 32px; }
.login-heading h2 { font-size: 28px; line-height: 1.35; letter-spacing: -.2px; }
.login-heading p { color: var(--text-3); margin-top: 8px; font-size: 13px; }

.field { margin-bottom: 18px; min-width: 0; }
.field > label {
    display: block;
    color: var(--text-2);
    font-size: 13px;
    margin-bottom: 7px;
    font-weight: 500;
}
.req { color: var(--danger); margin-right: 3px; }
.field-error { font-size: 12px; color: var(--danger); min-height: 18px; margin-top: 3px; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: var(--danger); }
.field.has-error input:focus { box-shadow: 0 0 0 3px rgba(245, 63, 63, .12); }

.check-line {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-2);
    font-size: 13px;
    cursor: pointer;
    margin: 2px 0 18px;
}
.check-line input { width: 16px; height: 16px; accent-color: var(--primary); }
.login-error { min-height: 24px; color: var(--danger); font-size: 13px; margin-bottom: 6px; }

.default-accounts {
    border-top: 1px solid var(--line);
    margin-top: 26px;
    padding-top: 18px;
    color: var(--text-3);
    font-size: 12px;
    line-height: 1.9;
}
.default-accounts strong { color: var(--text-2); font-weight: 600; margin-right: 6px; }
.login-foot { margin-top: 28px; color: var(--text-3); font-size: 12px; }

/* ===== 应用框架 ===== */
.app-view { min-height: 100vh; }

.sidebar {
    position: fixed;
    z-index: 40;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-w);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    transition: width .2s, transform .2s;
}
.sidebar-brand {
    height: 68px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 20px;
    border-bottom: 1px solid var(--line);
    overflow: hidden;
}
.sidebar-brand-text { display: flex; flex-direction: column; white-space: nowrap; }
.sidebar-brand-text strong { font-size: 19px; letter-spacing: 3px; line-height: 1.25; }
.sidebar-brand-text small { font-size: 11px; color: var(--text-3); letter-spacing: 1px; }

.teacher-badge {
    margin: 16px 14px 10px;
    padding: 11px 12px;
    background: var(--bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}
.teacher-avatar {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex: none;
}
.teacher-meta { display: flex; flex-direction: column; min-width: 0; white-space: nowrap; }
.teacher-meta strong { font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
.teacher-meta small { color: var(--text-3); font-size: 11px; }

.sidebar-nav {
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex: 1;
    overflow-y: auto;
}
.nav-item {
    border: 0;
    background: transparent;
    width: 100%;
    height: 42px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 0 12px;
    color: var(--text-2);
    white-space: nowrap;
    text-align: left;
    overflow: hidden;
    flex: none;
    font-size: 14px;
    transition: background .15s, color .15s;
}
.nav-item:hover { background: var(--bg); color: var(--text); }
.nav-item.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav-item.active .nav-icon { color: var(--primary); }
.nav-icon { display: inline-flex; width: 19px; height: 19px; flex: none; }

.sidebar-bottom { padding: 10px 12px 14px; border-top: 1px solid var(--line); }
.logout-btn { color: var(--text-3); }
.logout-btn:hover { color: var(--danger); background: var(--danger-soft); }

.sidebar.collapsed { width: 74px; }
.sidebar.collapsed .sidebar-brand { padding: 0 22px; }
.sidebar.collapsed .sidebar-brand-text,
.sidebar.collapsed .teacher-meta,
.sidebar.collapsed .nav-item > span:last-child { display: none; }
.sidebar.collapsed .teacher-badge { margin: 16px 13px 10px; padding: 6px; justify-content: center; }
.sidebar.collapsed .nav-item { justify-content: center; padding: 0; }
.sidebar.collapsed .collapse-btn [data-icon] { transform: rotate(180deg); }

.main-shell { margin-left: var(--sidebar-w); transition: margin-left .2s; min-height: 100vh; }
.sidebar.collapsed + .main-shell { margin-left: 74px; }

.topbar {
    height: 64px;
    background: rgba(255, 255, 255, .82);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 30;
}
.topbar-left { display: flex; align-items: center; gap: 12px; min-width: 0; }
.topbar-clock {
    font-size: 14px;
    color: var(--text-2);
    font-variant-numeric: tabular-nums;
    letter-spacing: .3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.topbar-actions { display: flex; align-items: center; gap: 10px; }

/* 顶栏自动保存状态 */
.save-state {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 34px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--card);
    color: var(--text-2);
    font-size: 12px;
    white-space: nowrap;
    transition: border-color .15s, color .15s, background .15s;
}
.save-state:hover { border-color: rgba(var(--primary-rgb), .4); color: var(--text); }
.save-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); flex: none; }
.save-state.is-ok { color: var(--success); border-color: rgba(0, 180, 42, .28); background: var(--success-soft); }
.save-state.is-ok .save-dot { background: var(--success); }
.save-state.is-local .save-dot { background: var(--success); }
.save-state.is-warn { color: var(--warning); border-color: rgba(255, 125, 0, .3); background: var(--warning-soft); }
.save-state.is-warn .save-dot { background: var(--warning); animation: pulse 1.6s infinite; }
.save-state.is-busy .save-dot { background: var(--primary); animation: pulse 1s infinite; }
.save-state.is-error { color: var(--danger); border-color: rgba(245, 63, 63, .3); background: var(--danger-soft); }
.save-state.is-error .save-dot { background: var(--danger); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }

/* 设置页：自动备份卡片 */
.backup-status {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: 10px;
    margin-bottom: 14px;
}
.backup-status strong { display: block; font-size: 13.5px; font-weight: 500; }
.backup-status small { display: block; margin-top: 3px; font-size: 12px; color: var(--text-3); line-height: 1.7; }
.backup-dot { width: 9px; height: 9px; border-radius: 50%; margin-top: 5px; flex: none; background: var(--text-3); }
.backup-dot.ready { background: var(--success); box-shadow: 0 0 0 3px var(--success-soft); }
.backup-dot.writing { background: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.backup-dot.need-permission { background: var(--warning); box-shadow: 0 0 0 3px var(--warning-soft); }
.backup-dot.error, .backup-dot.unsupported { background: var(--danger); box-shadow: 0 0 0 3px var(--danger-soft); }

.theme-quick { display: flex; align-items: center; gap: 8px; color: var(--text-3); font-size: 12px; }
.theme-quick select { width: 108px; padding: 6px 9px; min-height: 34px; border-radius: 8px; }
.mobile-nav { display: none; }

.page-content { padding: 28px 32px 56px; max-width: 1640px; margin: 0 auto; }

.page-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 20px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.page-head h2 { font-size: 25px; line-height: 1.35; letter-spacing: -.3px; font-weight: 650; }
.page-head p { color: var(--text-3); margin-top: 6px; font-size: 13.5px; max-width: 760px; }
.page-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ===== 卡片 ===== */
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}
.card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.card-title {
    font-size: 16px;
    font-weight: 650;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -.1px;
}
.card-title:before {
    content: "";
    width: 4px;
    height: 15px;
    border-radius: 2px;
    background: var(--primary);
    flex: none;
}
.card-subtitle { font-size: 12px; color: var(--text-3); font-weight: 400; margin-left: 4px; }
.section-actions { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }

.muted { color: var(--text-3); }
.small { font-size: 12px; }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-success { color: var(--success); }
.text-primary { color: var(--primary); }
.strong { font-weight: 600; }
.nowrap { white-space: nowrap; }

/* ===== 数据卡片 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.stat-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px 22px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.stat-card:after {
    content: "";
    position: absolute;
    right: 0;
    top: 0;
    width: 56px;
    height: 3px;
    background: var(--primary);
}
.stat-label { color: var(--text-3); font-size: 13px; }
.stat-value {
    font-size: 31px;
    line-height: 1.3;
    font-weight: 650;
    margin-top: 8px;
    letter-spacing: -.6px;
    font-variant-numeric: tabular-nums;
}
.stat-value small { font-size: 14px; color: var(--text-3); font-weight: 400; margin-left: 5px; letter-spacing: 0; }
.stat-foot { font-size: 12px; color: var(--text-3); margin-top: 6px; }

/* ===== 课程表 ===== */
.schedule-toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.segmented { display: inline-flex; padding: 3px; background: var(--bg); border-radius: 9px; }
.segmented button {
    border: 0;
    background: transparent;
    color: var(--text-2);
    padding: 5px 14px;
    border-radius: 7px;
    font-size: 13px;
}
.segmented button.active { background: #fff; color: var(--primary); box-shadow: 0 1px 4px rgba(16, 21, 31, .1); font-weight: 600; }
.schedule-title { font-size: 14px; font-weight: 600; color: var(--text-2); font-variant-numeric: tabular-nums; }

.week-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(118px, 1fr));
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: auto;
}
.day-column { min-height: 268px; border-right: 1px solid var(--line); background: #fff; min-width: 118px; }
.day-column:last-child { border-right: 0; }
.day-head { text-align: center; padding: 12px 6px; border-bottom: 1px solid var(--line); background: var(--bg-soft); }
.day-head strong { display: block; font-size: 13px; }
.day-head span { font-size: 12px; color: var(--text-3); }
.day-column.today .day-head { color: var(--primary); background: var(--primary-soft); }
.day-column.today .day-head span { color: var(--primary); opacity: .75; }
.day-column.rest-day { background: var(--bg-soft); }
.day-column.rest-day .day-head { background: var(--bg-soft); color: var(--text-3); }
.day-courses { padding: 8px; display: flex; flex-direction: column; gap: 7px; }

.course-chip {
    border-left: 3px solid var(--primary);
    border-radius: 7px;
    background: var(--primary-soft);
    padding: 8px 9px;
    cursor: pointer;
    transition: transform .12s, box-shadow .12s;
}
.course-chip:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(16, 21, 31, .08); }
.course-chip.status-done { border-color: var(--success); background: var(--success-soft); }
.course-chip.status-leave { border-color: var(--warning); background: var(--warning-soft); }
.course-chip .course-time { font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: flex; align-items: baseline; justify-content: space-between; gap: 6px; }
.course-chip .course-dur { font-size: 11px; font-weight: 500; color: var(--text-3); }
.course-chip .course-name { font-size: 13px; margin: 2px 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-chip .course-student { font-size: 11px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rest-label { text-align: center; font-size: 12px; color: var(--text-3); padding: 14px 0; }

.month-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(108px, 1fr));
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
    border-radius: 10px;
    overflow: auto;
}
.month-weekday {
    text-align: center;
    padding: 9px;
    background: var(--bg-soft);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    font-size: 12px;
    color: var(--text-2);
    min-width: 108px;
}
.month-cell {
    min-height: 118px;
    padding: 7px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: #fff;
    min-width: 108px;
}
.month-cell.other-month { background: var(--bg-soft); color: var(--text-3); }
.month-cell.rest-day { background: var(--bg-soft); }
.month-cell.today .month-date { background: var(--primary); color: #fff; }
.month-date {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 12px;
    margin-bottom: 5px;
    font-variant-numeric: tabular-nums;
}
.month-cell .course-chip { padding: 4px 6px; margin-bottom: 4px; }
.month-cell .course-chip .course-name { font-size: 11px; }
.month-cell .course-chip .course-student { display: none; }

/* ===== 图表与列表 ===== */
.dashboard-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.dashboard-grid .card { margin-bottom: 0; min-width: 0; }
.chart-box { height: 230px; display: flex; align-items: center; justify-content: center; position: relative; }
.chart-box svg { width: 100%; height: 100%; overflow: visible; }
.chart-legend {
    display: flex;
    justify-content: center;
    gap: 18px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--text-2);
    margin-top: 8px;
}
.legend-dot { display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 5px; }

.donut-wrap { display: flex; align-items: center; justify-content: center; gap: 32px; min-height: 218px; }
.donut { width: 158px; height: 158px; border-radius: 50%; position: relative; flex: none; }
.donut:after { content: ""; position: absolute; inset: 34px; background: #fff; border-radius: 50%; }
.donut-center {
    position: absolute;
    inset: 0;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.donut-center strong { font-size: 24px; font-variant-numeric: tabular-nums; }
.donut-center span { font-size: 11px; color: var(--text-3); }
.donut-legend { min-width: 130px; display: flex; flex-direction: column; gap: 9px; font-size: 12px; }
.donut-legend > div { display: flex; justify-content: space-between; gap: 14px; }

.compact-list { display: flex; flex-direction: column; }
.compact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 0;
    border-bottom: 1px solid #f1f3f6;
    cursor: pointer;
}
.compact-item:last-child { border-bottom: 0; }
.compact-item:hover .compact-main { color: var(--primary); }
.compact-date { font-size: 12px; color: var(--text-3); min-width: 78px; font-variant-numeric: tabular-nums; }
.compact-main { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.compact-extra { font-size: 12px; color: var(--text-2); white-space: nowrap; }

/* ===== 筛选与表单 ===== */
.filter-bar {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    flex-wrap: wrap;
    margin-bottom: 18px;
    padding: 16px;
    background: var(--bg);
    border-radius: 10px;
}
.filter-bar .field { margin: 0; min-width: 138px; }
.filter-bar .field.grow { flex: 1; min-width: 200px; }
.filter-bar .field > label { font-size: 12px; margin-bottom: 4px; }
.filter-bar .btn { margin-bottom: 0; }

.form-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 18px; }
.form-grid .span-2 { grid-column: span 2; }
.form-grid .span-3 { grid-column: 1 / -1; }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 10px; flex-wrap: wrap; }

/* ===== 表格 ===== */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; background: #fff; min-width: 760px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th {
    background: var(--bg-soft);
    color: var(--text-3);
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    letter-spacing: .2px;
}
td { font-size: 13px; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--bg-soft); }
.table-actions { display: flex; gap: 3px; white-space: nowrap; }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 9px;
    border-radius: 99px;
    font-size: 12px;
    background: var(--bg);
    color: var(--text-2);
    white-space: nowrap;
    line-height: 1.7;
}
.badge.blue { background: var(--primary-soft); color: var(--primary); }
.badge.green { background: var(--success-soft); color: #06932a; }
.badge.orange { background: var(--warning-soft); color: #d86900; }
.badge.red { background: var(--danger-soft); color: var(--danger); }
.badge.gray { background: #f1f3f6; color: var(--text-3); }

.pagination {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
    color: var(--text-3);
    font-size: 12px;
}
.pagination button {
    border: 1px solid var(--line-strong);
    background: #fff;
    border-radius: 7px;
    padding: 4px 11px;
    color: var(--text-2);
}
.pagination button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

.empty { padding: 46px 20px; text-align: center; color: var(--text-3); }
.empty-icon {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: var(--bg);
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--text-3);
}
.empty p { margin-bottom: 14px; font-size: 13px; }

/* ===== 学生档案 ===== */
.student-layout { display: grid; grid-template-columns: 292px minmax(0, 1fr); gap: 20px; align-items: start; }
.student-list-card { padding: 16px; margin: 0; }
.student-list-card input { margin-bottom: 12px; }
.student-list { display: flex; flex-direction: column; gap: 4px; max-height: 720px; overflow: auto; }
.student-list-item {
    border: 1px solid transparent;
    background: transparent;
    border-radius: 9px;
    padding: 10px;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background .15s;
}
.student-list-item:hover { background: var(--bg); }
.student-list-item.active { background: var(--primary-soft); border-color: rgba(var(--primary-rgb), .18); }
.mini-avatar {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: var(--primary-soft);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex: none;
}
.student-list-item .info { flex: 1; min-width: 0; }
.student-list-item .info strong { display: block; font-size: 13px; }
.student-list-item .info small {
    display: block;
    color: var(--text-3);
    font-size: 11.5px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.profile-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.profile-person { display: flex; align-items: center; gap: 14px; }
.profile-avatar {
    width: 52px;
    height: 52px;
    border-radius: 13px;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 600;
    flex: none;
}
.profile-person h3 { font-size: 20px; letter-spacing: -.2px; }
.profile-person p { font-size: 12.5px; color: var(--text-3); margin-top: 4px; }
.profile-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 20px; }
.profile-stat { padding: 14px 16px; background: var(--bg); border-radius: 10px; }
.profile-stat span { display: block; font-size: 12px; color: var(--text-3); }
.profile-stat strong { display: block; font-size: 21px; margin-top: 4px; font-variant-numeric: tabular-nums; }

.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px 20px; margin-bottom: 22px; }
.info-item label { display: block; font-size: 12px; color: var(--text-3); }
.info-item div { margin-top: 3px; font-size: 13px; word-break: break-word; }

.tabs { display: flex; gap: 22px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.tabs button {
    border: 0;
    background: transparent;
    padding: 10px 2px;
    color: var(--text-2);
    position: relative;
    font-size: 13.5px;
}
.tabs button.active { color: var(--primary); font-weight: 600; }
.tabs button.active:after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

/* ===== 设置 ===== */
.settings-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.settings-grid .card { margin: 0; }
.theme-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.theme-option {
    border: 2px solid var(--line);
    border-radius: 10px;
    padding: 11px;
    background: #fff;
    text-align: left;
    font-size: 12.5px;
    color: var(--text-2);
    transition: border-color .15s, transform .15s;
}
.theme-option:hover { transform: translateY(-1px); border-color: var(--line-strong); }
.theme-option.active { border-color: var(--primary); color: var(--primary); font-weight: 600; }
.theme-swatch {
    height: 44px;
    border-radius: 7px;
    margin-bottom: 8px;
    display: flex;
    align-items: flex-end;
    padding: 7px;
    gap: 4px;
}
.theme-swatch i { display: block; width: 9px; background: #fff; border-radius: 2px; opacity: .88; }
.theme-swatch i:nth-child(1) { height: 12px; }
.theme-swatch i:nth-child(2) { height: 26px; }
.theme-swatch i:nth-child(3) { height: 18px; }
.theme-swatch.blue { background: linear-gradient(135deg, #0a2fb0, #165dff); }
.theme-swatch.violet { background: linear-gradient(135deg, #3a1c9c, #6d3bf5); }
.theme-swatch.coral { background: linear-gradient(135deg, #b83a13, #ff5a2c); }
.theme-swatch.teal { background: linear-gradient(135deg, #01645f, #00b2a9); }
.theme-swatch.green { background: linear-gradient(135deg, #075c3a, #0fa968); }
.theme-swatch.gray { background: linear-gradient(135deg, #0d1219, #4b5668); }
.theme-swatch.white { background: linear-gradient(135deg, #ffffff, #eef1f6); border: 1px solid var(--line-strong); }
.theme-swatch.white i { background: #0071e3; }

.weekday-checks { display: flex; gap: 8px; flex-wrap: wrap; }
.weekday-check { position: relative; }
.weekday-check input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.weekday-check span {
    display: flex;
    width: 46px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    color: var(--text-2);
    cursor: pointer;
    font-size: 13px;
}
.weekday-check input:checked + span {
    background: var(--primary-soft);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

.course-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.course-tag {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 5px 10px;
    background: var(--bg);
    border-radius: 7px;
    font-size: 12.5px;
}
.course-tag button { border: 0; background: transparent; color: var(--text-3); padding: 0; font-size: 14px; line-height: 1; }
.course-tag button:hover { color: var(--danger); }
.inline-form { display: flex; gap: 8px; }
.inline-form input { flex: 1; }

/* ===== 班级管理 ===== */
.class-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.class-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: box-shadow .15s, transform .15s, border-color .15s;
}
.class-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); border-color: rgba(var(--primary-rgb), .3); }
.class-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.class-card-name { font-size: 17px; font-weight: 650; letter-spacing: -.2px; }
.class-card-course { font-size: 12.5px; color: var(--text-3); margin-top: 3px; }
.class-card-avatar {
    width: 42px;
    height: 42px;
    border-radius: 11px;
    background: var(--primary-soft);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 650;
    font-size: 16px;
    flex: none;
}
.class-stats { display: flex; gap: 22px; }
.class-stat { display: flex; flex-direction: column; }
.class-stat span { font-size: 11.5px; color: var(--text-3); }
.class-stat strong { font-size: 18px; font-variant-numeric: tabular-nums; }
.class-members {
    font-size: 12px;
    color: var(--text-2);
    line-height: 1.8;
    background: var(--bg);
    border-radius: 8px;
    padding: 8px 10px;
    min-height: 44px;
}
.class-card-actions { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; }

/* ===== 上课记录参与者 ===== */
.participant-box { border: 1px solid var(--line); border-radius: 10px; padding: 12px; background: var(--bg); }
.participant-toolbar { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; margin-bottom: 10px; }
.participant-count { margin-left: auto; font-size: 12px; color: var(--primary); font-weight: 600; }
.participant-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    max-height: 180px;
    overflow: auto;
    padding-right: 2px;
}
.participant-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 7px 9px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
}
.participant-item:hover { border-color: var(--primary); }
.participant-item input { width: 15px; height: 15px; margin-top: 3px; accent-color: var(--primary); flex: none; }
.participant-item span { display: flex; flex-direction: column; min-width: 0; }
.participant-item strong { font-size: 13px; font-weight: 500; }
.participant-item small {
    font-size: 11px;
    color: var(--text-3);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.participant-item.is-expired { border-color: #ffd9d7; background: var(--danger-soft); }
.participant-item.is-expired small { color: var(--danger); }

/* ===== 班级批量加人 ===== */
.picker-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.picker-head input { flex: 1; min-width: 220px; }
.picker-toolbar { display: flex; align-items: center; gap: 12px; padding: 8px 12px; background: var(--bg); border-radius: 9px; margin-bottom: 10px; }
.picker-check { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; cursor: pointer; }
.picker-check input { width: 15px; height: 15px; accent-color: var(--primary); }
.picker-pool { max-height: 46vh; }

/* ===== 收费 ===== */
.fee-preview {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    background: var(--primary-soft);
    border-radius: 10px;
    padding: 14px 18px;
}
.fee-preview > div { display: flex; flex-direction: column; gap: 2px; font-size: 12px; color: var(--text-2); }
.fee-preview strong { font-size: 17px; color: var(--text); font-variant-numeric: tabular-nums; }
.fee-summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 14px; }
.fee-summary > div { background: var(--bg); border-radius: 9px; padding: 12px 14px; }
.fee-summary span { display: block; font-size: 12px; color: var(--text-3); }
.fee-summary strong { display: block; font-size: 20px; margin-top: 3px; font-variant-numeric: tabular-nums; }
.fee-chart svg { width: 100%; height: 252px; }
.compact-empty {
    padding: 22px 18px;
    background: var(--bg);
    border-radius: 9px;
    color: var(--text-3);
    font-size: 12.5px;
    text-align: center;
}

.data-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.danger-zone { border-color: #ffd9d7; }
.danger-zone .card-title:before { background: var(--danger); }

/* ===== 弹窗 ===== */
.modal-mask {
    position: fixed;
    inset: 0;
    background: rgba(13, 18, 25, .46);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    animation: fadeIn .15s;
}
.modal {
    background: #fff;
    width: min(680px, 100%);
    max-height: calc(100vh - 48px);
    border-radius: 14px;
    box-shadow: 0 24px 70px rgba(13, 18, 25, .28);
    display: flex;
    flex-direction: column;
    animation: slideUp .18s;
}
.modal.modal-sm { width: min(452px, 100%); }
.modal.modal-lg { width: min(920px, 100%); }
.modal-head {
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-head h3 { font-size: 17px; letter-spacing: -.2px; }
.modal-close { border: 0; background: transparent; font-size: 22px; color: var(--text-3); line-height: 1; padding: 0 4px; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 22px 24px; overflow: auto; }
.modal-foot { padding: 15px 24px; border-top: 1px solid var(--line); display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; }

.confirm-icon {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--warning-soft);
    color: var(--warning);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
}
.confirm-icon.danger { background: var(--danger-soft); color: var(--danger); }
.confirm-text { color: var(--text-2); line-height: 1.85; white-space: pre-line; font-size: 13.5px; }

/* ===== 轻提示 ===== */
.toast-root {
    position: fixed;
    right: 24px;
    top: 84px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}
.toast {
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 10px 34px rgba(13, 18, 25, .13);
    border-radius: 10px;
    padding: 12px 16px;
    min-width: 250px;
    max-width: 420px;
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: auto;
    animation: slideIn .2s;
}
.toast:before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); flex: none; }
.toast.success:before { background: var(--success); }
.toast.error:before { background: var(--danger); }
.toast.warning:before { background: var(--warning); }
.toast-message { flex: 1; font-size: 13px; }
.toast button { border: 0; background: transparent; color: var(--primary); font-size: 12px; white-space: nowrap; font-weight: 600; }

/* ===== 存储异常 ===== */
.storage-error {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.storage-error-card { max-width: 560px; background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 38px; box-shadow: var(--shadow-hover); }
.storage-error-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--danger-soft);
    color: var(--danger);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 18px;
}
.storage-error-card h1 { font-size: 22px; }
.storage-error-card p { color: var(--text-2); margin: 14px 0; }
.storage-error-card ol { color: var(--text-2); padding-left: 22px; margin-bottom: 24px; line-height: 2; }

/* ===== ClassIn 配套方案页 ===== */
.ci-page { display: flex; flex-direction: column; gap: 22px; }

.ci-hero {
    position: relative;
    overflow: hidden;
    border-radius: 18px;
    background: linear-gradient(135deg, #0a1020 0%, #14243f 46%, #1d3a6b 100%);
    color: #fff;
    padding: 52px 52px 46px;
}
.ci-hero:before {
    content: "";
    position: absolute;
    width: 480px;
    height: 480px;
    right: -170px;
    top: -190px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(22, 93, 255, .55), transparent 62%);
    filter: blur(2px);
}
.ci-hero:after {
    content: "";
    position: absolute;
    right: 40px;
    bottom: -130px;
    width: 340px;
    height: 340px;
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 50%;
    box-shadow: 0 0 0 56px rgba(255, 255, 255, .022);
}
.ci-hero-inner { position: relative; z-index: 1; max-width: 880px; }
.ci-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    letter-spacing: 3px;
    color: rgba(255, 255, 255, .62);
    border: 1px solid rgba(255, 255, 255, .18);
    border-radius: 99px;
    padding: 5px 14px;
    margin-bottom: 22px;
}
.ci-hero h2 { font-size: 34px; line-height: 1.42; letter-spacing: -.6px; font-weight: 650; max-width: 840px; }
.ci-hero h2 em { font-style: normal; color: #7fb2ff; }
.ci-hero p { margin-top: 18px; font-size: 14.5px; line-height: 1.9; color: rgba(255, 255, 255, .72); max-width: 700px; }
.ci-hero-actions { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.ci-hero-actions .btn-secondary { background: transparent; border-color: rgba(255, 255, 255, .3); color: #fff; }
.ci-hero-actions .btn-secondary:hover { background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .5); color: #fff; }
.ci-hero-meta { display: flex; gap: 34px; margin-top: 34px; flex-wrap: wrap; }
.ci-hero-meta div span { display: block; font-size: 12px; color: rgba(255, 255, 255, .55); letter-spacing: .5px; }
.ci-hero-meta div strong { font-size: 15px; font-weight: 600; }

.ci-section {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 34px;
    box-shadow: var(--shadow);
}
.ci-section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 26px; flex-wrap: wrap; }
.ci-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    letter-spacing: 2.4px;
    color: var(--primary);
    margin-bottom: 10px;
    text-transform: uppercase;
}
.ci-eyebrow:before { content: ""; width: 18px; height: 2px; background: var(--primary); }
.ci-section h3 { font-size: 24px; letter-spacing: -.4px; line-height: 1.4; font-weight: 650; }
.ci-section-desc { color: var(--text-2); font-size: 14px; line-height: 1.95; max-width: 760px; margin-top: 10px; }

.ci-split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 34px; align-items: start; }
.ci-points { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.ci-point {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 16px 18px;
    background: var(--card);
    transition: border-color .15s, transform .15s, box-shadow .15s;
}
.ci-point:hover { border-color: rgba(var(--primary-rgb), .35); transform: translateY(-2px); box-shadow: var(--shadow); }
.ci-point strong { display: block; font-size: 14.5px; margin-bottom: 5px; }
.ci-point span { font-size: 12.5px; color: var(--text-3); line-height: 1.8; display: block; }
.ci-point i {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 12px;
    font-style: normal;
    font-weight: 700;
    margin-bottom: 10px;
}

.ci-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.ci-figure {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    background: #eef1f5;
    border: 1px solid var(--line);
    margin: 0;
}
.ci-figure img { display: block; width: 100%; height: 100%; object-fit: cover; }
.ci-figure figcaption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 26px 16px 12px;
    color: #fff;
    font-size: 12px;
    background: linear-gradient(transparent, rgba(10, 16, 32, .78));
}
.ci-gallery .wide { grid-column: 1 / -1; }
.ci-gallery .wide img { max-height: 420px; }
.ci-gallery .tall { grid-row: span 2; }
.ci-gallery .tall img { min-height: 420px; }
.ci-gallery .short img { min-height: 200px; }
.ci-gallery figure:not(.wide) img { min-height: 260px; max-height: 320px; }

.ci-badge-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.ci-tag {
    font-size: 12px;
    color: var(--text-2);
    background: var(--bg);
    border-radius: 99px;
    padding: 5px 13px;
}

.ci-soft {
    background: linear-gradient(160deg, #f7f9fc, #eef3fb);
    border: 1px solid #e3eaf4;
    border-radius: 16px;
    padding: 28px 34px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.ci-soft strong { font-size: 16px; letter-spacing: -.2px; }
.ci-soft p { font-size: 13px; color: var(--text-2); margin-top: 6px; line-height: 1.85; max-width: 660px; }

.ci-contact {
    background: #0d1220;
    color: #fff;
    border-radius: 16px;
    padding: 34px;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 34px;
    align-items: center;
}
.ci-contact h3 { font-size: 23px; letter-spacing: -.3px; }
.ci-contact p { color: rgba(255, 255, 255, .68); font-size: 13.5px; line-height: 1.95; margin-top: 12px; max-width: 460px; }
.ci-contact-person { display: flex; align-items: center; gap: 14px; margin-top: 22px; }
.ci-contact-avatar {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: rgba(255, 255, 255, .12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    font-weight: 600;
    flex: none;
}
.ci-contact-person strong { font-size: 17px; display: block; }
.ci-contact-person span { font-size: 12.5px; color: rgba(255, 255, 255, .6); }
.ci-contact-list { display: flex; flex-direction: column; gap: 2px; }
.ci-contact-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 13px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, .1);
    font-size: 13px;
}
.ci-contact-item:last-child { border-bottom: 0; }
.ci-contact-item span { color: rgba(255, 255, 255, .58); }
.ci-contact-item strong { font-size: 15px; letter-spacing: .4px; font-variant-numeric: tabular-nums; }

/* ===== 动画 ===== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(15px); } to { opacity: 1; transform: translateX(0); } }

/* ===== 响应式 ===== */
@media (max-width: 1280px) {
    .ci-split { grid-template-columns: 1fr; }
    .class-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .ci-gallery .tall img { min-height: 320px; }
}

@media (max-width: 1200px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .dashboard-grid { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: repeat(2, 1fr); }
    .form-grid .span-3 { grid-column: 1 / -1; }
    .settings-grid { grid-template-columns: 1fr; }
    .login-brand { padding: 40px 44px 46px; }
    .login-brand h1 { font-size: 34px; }
    .ci-hero { padding: 44px 40px; }
    .ci-hero h2 { font-size: 28px; }
}

@media (max-width: 980px) {
    .ci-gallery { grid-template-columns: 1fr; }
    .ci-gallery .tall img, .ci-gallery .short img { min-height: 240px; }
    .ci-contact { grid-template-columns: 1fr; }
    .ci-section { padding: 26px; }
}

@media (max-width: 860px) {
    .login-view { grid-template-columns: 1fr; }
    .login-brand { display: none; }
    .login-panel { min-height: 100vh; padding: 32px 24px; }
    .brand-mark.mobile { display: flex; margin-bottom: 18px; }
    .sidebar { transform: translateX(-100%); width: 244px !important; }
    .sidebar.mobile-open { transform: translateX(0); }
    .sidebar.collapsed .sidebar-brand-text,
    .sidebar.collapsed .teacher-meta,
    .sidebar.collapsed .nav-item > span:last-child { display: initial; }
    .sidebar.collapsed .teacher-badge { justify-content: flex-start; padding: 11px 12px; }
    .sidebar.collapsed .nav-item { justify-content: flex-start; padding: 0 12px; }
    .main-shell, .sidebar.collapsed + .main-shell { margin-left: 0; }
    .topbar { padding: 0 18px; }
    .mobile-nav { display: inline-flex; }
    .page-content { padding: 20px 16px 44px; }
    .student-layout { grid-template-columns: 1fr; }
    .student-list { max-height: 260px; }
    .form-grid { grid-template-columns: 1fr; }
    .form-grid .span-2, .form-grid .span-3 { grid-column: auto; }
    .theme-quick > span { display: none; }
    .page-head { flex-direction: column; align-items: flex-start; }
    .page-head h2 { font-size: 22px; }
    .profile-stats, .info-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { gap: 12px; }
    .stat-card { padding: 16px; }
    .stat-value { font-size: 26px; }
    .participant-grid { grid-template-columns: repeat(2, 1fr); }
    .fee-summary { grid-template-columns: repeat(2, 1fr); }
    .class-grid { grid-template-columns: 1fr; }
    .ci-points { grid-template-columns: 1fr; }
    .ci-hero { padding: 32px 24px; border-radius: 14px; }
    .ci-hero h2 { font-size: 23px; }
    .ci-hero-meta { gap: 22px; margin-top: 24px; }
    .ci-section { padding: 22px; border-radius: 14px; }
    .ci-section h3 { font-size: 20px; }
    .ci-soft, .ci-contact { padding: 22px; border-radius: 14px; }
}

@media (max-width: 700px) {
    .course-chip .course-dur { display: none; }
    .course-chip .course-time { font-size: 12.5px; }
}

@media (max-width: 520px) {
    .stats-grid { grid-template-columns: 1fr; }
    .topbar-clock { font-size: 12px; }
    .theme-quick { display: none; }
    .save-state { padding: 0 9px; }
    .save-state span { display: none; }
    .card { padding: 18px; }
    .card-head { align-items: flex-start; flex-direction: column; }
    .profile-stats, .info-grid { grid-template-columns: 1fr; }
    .donut-wrap { flex-direction: column; }
    .modal-mask { padding: 12px; }
    .participant-grid { grid-template-columns: 1fr; }
    .fee-preview { grid-template-columns: 1fr; }
    .fee-summary { grid-template-columns: 1fr 1fr; }
    .modal-body { padding: 18px; }
    .modal-head, .modal-foot { padding-left: 18px; padding-right: 18px; }
    .toast-root { left: 14px; right: 14px; top: 76px; }
    .toast { min-width: 0; max-width: none; }
    .theme-options { grid-template-columns: repeat(2, 1fr); }
}