/* ============================================================
   SouthBridge 设计系统 · app.css
   老师端（theme-teacher，深蓝 #1e40af）+ 学生端（theme-student，墨绿 #35634a）
   组件前缀 sb-，避免与既有内联样式/Tailwind 类冲突。
   ============================================================ */

/* ── 语义色（两端共用）── */
:root {
    --ok: #248a3d;
    --ok-soft: #e9f8ed;
    --warn: #b76e00;
    --warn-soft: #fff6df;
    --danger: #d70015;
    --danger-soft: #fff0f1;
    --ease: cubic-bezier(.2, .8, .2, 1);
}

/* ── 两套主题令牌 ── */
.theme-teacher {
    --accent: #0071e3;
    --accent-dark: #0066cc;
    --accent-soft: #eaf4ff;
    --accent-ink: #0066cc;
    --bg: #f4f7fb;
    --surface: rgba(255,255,255,.82);
    --ink: #1d1d1f;
    --muted: #6e6e73;
    --faint: #86868b;
    --hairline: rgba(60,60,67,.14);
    --container: 1120px;
}
.theme-student {
    /* 学生课程门户：纸张米色 + 学院墨绿，与老师端蓝色运营系统明确区隔。 */
    --accent: #35634a;
    --accent-dark: #264b37;
    --accent-soft: #e7f0e8;
    --accent-ink: #264b37;
    --bg: #f7f3e9;
    --surface: rgba(255,253,247,.88);
    --ink: #26352b;
    --muted: #667169;
    --faint: #8c968c;
    --hairline: rgba(67,82,68,.16);
    --student-orange: #c87835;
    --container: 860px;
}

/* ── 基础 ── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    background: radial-gradient(circle at 88% -10%, rgba(173,216,255,.48), transparent 29%),
        radial-gradient(circle at -10% 38%, rgba(230,241,255,.7), transparent 31%), var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
        "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-weight: 400;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.theme-student {
    background: radial-gradient(circle at 88% -10%, rgba(183,203,172,.46), transparent 30%),
        radial-gradient(circle at -10% 38%, rgba(236,224,190,.58), transparent 32%), var(--bg);
}
a { color: var(--accent); }
.sb-serif {
    font-family: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
}
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, .14); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, .22); }

/* ── 老师端侧边栏 ── */
.sb-nav {
    position: fixed; inset: 0 auto 0 0; z-index: 50; width: 230px;
    background: rgba(249,252,255,.68);
    -webkit-backdrop-filter: saturate(170%) blur(26px);
    backdrop-filter: saturate(170%) blur(26px);
    border-right: 1px solid rgba(197,214,231,.62);
    overflow-y: auto;
}
.sb-nav-inner {
    height: 100%; padding: 25px 13px 18px;
    display: flex; flex-direction: column; justify-content: space-between;
}
.sb-nav-left { min-width: 0; width: 100%; }
.sb-nav-logo {
    display: block; padding: 0 10px 25px; font-size: 17px; font-weight: 650; letter-spacing: -.5px;
    color: var(--ink); text-decoration: none;
}
.sb-nav-logo .accent { color: var(--accent); }
.sb-nav-logo small { display: block; margin-top: 2px; color: var(--faint); font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC",sans-serif; font-size: 8px; font-weight: 800; letter-spacing: .13em; }
.sb-nav-planning { display:grid; grid-template-columns:1fr 1fr; gap:6px; margin:0 4px 18px; padding-bottom:15px; border-bottom:1px solid rgba(127,150,173,.18); }
.sb-nav-link-planning { justify-content:center; padding:9px 5px; background:rgba(234,244,255,.72); color:#1769ad; font-size:12px; font-weight:750; box-shadow:inset 0 0 0 1px rgba(177,216,246,.36); }
.sb-nav-link-planning:hover,.sb-nav-link-planning.active { background:#e1f1ff; color:#005fae; }
.sb-nav-links { display: flex; flex-direction: column; gap: 2px; }
.sb-nav-group { margin: 0 9px 5px; color: #8192a6; font-size: 9px; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.sb-nav-group-later { margin-top: 19px; }
.sb-nav-link {
    display: flex; align-items: center; position: relative;
    font-size: 13px; font-weight: 570; color: #63758a;
    text-decoration: none; padding: 9px 10px; border-radius: 10px;
    transition: color .18s ease, background .18s ease, transform .18s var(--ease);
}
.sb-nav-badge { display:inline-grid; place-items:center; min-width:18px; height:18px; margin-left:7px; padding:0 5px; border-radius:999px; background:#e5484d; color:#fff; font-size:10px; font-weight:800; line-height:1; box-shadow:0 2px 6px rgba(229,72,77,.28); }
.sb-nav-badge-warning { background:#fff4cc; color:#a16207; border:1px solid #f1d37a; box-shadow:0 2px 6px rgba(161,98,7,.16); }
.sb-nav-link:hover { color: var(--ink); background: rgba(255,255,255,.7); transform: translateX(1px); }
.sb-nav-link.active { color: #006dce; background: rgba(234,244,255,.9); box-shadow: inset 0 0 0 1px rgba(177,216,246,.42); }
.sb-nav-right { display: flex; flex-direction: column; align-items: stretch; gap: 9px; width: 100%; padding: 12px 9px 0; border-top: 1px solid rgba(127,150,173,.18); }
.sb-nav-user { display:grid; grid-template-columns:26px 1fr; column-gap:8px; align-items:center; font-size:12px; color:#41566c; font-weight:650; }
.sb-nav-user small { grid-column:2; margin-top:-3px; color:var(--faint); font-size:10px; font-weight:500; }
.sb-nav-avatar { display:grid; grid-row:span 2; place-items:center; width:26px; height:26px; border-radius:9px; background:linear-gradient(145deg,#e7f4ff,#d3e8fc); color:var(--accent); font-size:11px; font-weight:800; }
.sb-nav-logout {
    font-size: 11px; color: var(--muted); text-decoration: none; padding: 6px 0 0 34px;
    transition: color .15s ease;
}
.sb-nav-logout:hover { color: var(--danger); }

/* ── 主内容容器 ── */
.sb-main { max-width: calc(var(--container) + 110px); margin-left:230px; margin-right:auto; padding:34px 36px 58px; animation:sb-page-in .45s var(--ease); }

/* ── 按钮 ── */
.sb-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 7px;
    background: var(--accent); color: #fff; border: none; cursor: pointer;
    font-size: 13px; font-weight: 600; padding: 10px 18px; border-radius: 12px;
    text-decoration: none; font-family: inherit; line-height: 1.4;
    box-shadow: 0 8px 18px -12px rgba(0,113,227,.75);
    transition: background .22s ease, transform .22s var(--ease), box-shadow .22s ease;
}
.sb-btn:hover {
    background: var(--accent-dark); transform: translateY(-1px) scale(1.01);
    box-shadow: 0 13px 24px -15px rgba(0,113,227,.82);
}
.theme-student .sb-btn { box-shadow: 0 8px 18px -12px rgba(38,75,55,.7); }
.theme-student .sb-btn:hover { box-shadow: 0 13px 24px -15px rgba(38,75,55,.78); }
.theme-student .sb-input:focus { box-shadow: 0 0 0 4px rgba(53,99,74,.12); }
.sb-btn:active { transform: none; }
.sb-btn:disabled { opacity: .6; cursor: default; transform: none; box-shadow: none; }
.sb-btn-ghost {
    background: transparent; color: var(--accent);
    border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
}
.sb-btn-ghost:hover { background: var(--accent-soft); box-shadow: none; }

/* ── 卡片 ── */
.sb-card {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: 18px;
    box-shadow: 0 1px rgba(255,255,255,.9) inset, 0 18px 42px -34px rgba(15,47,87,.46);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

/* ── 状态标签 ── */
.sb-badge {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 2px 10px; border-radius: 9999px;
    font-size: 11px; font-weight: 500; line-height: 1.5; white-space: nowrap;
}
.sb-badge.ok    { background: var(--ok-soft); color: var(--ok); }
.sb-badge.warn  { background: var(--warn-soft); color: var(--warn); }
.sb-badge.danger{ background: var(--danger-soft); color: var(--danger); }
.sb-badge.neutral { background: var(--accent-soft); color: var(--accent-ink); }

/* ── 小标签（目标校等）── */
.sb-chip {
    display: inline-flex; align-items: center;
    padding: 2px 10px; border-radius: 9999px;
    font-size: 11px; font-weight: 500; line-height: 1.5;
    background: var(--accent-soft); color: var(--accent-ink); white-space: nowrap;
}

/* ── 表单 ── */
.sb-field { display: block; margin-bottom: 14px; }
.sb-label { display: block; font-size: 12.5px; font-weight: 500; color: var(--muted); margin-bottom: 6px; }
.sb-input {
    display: block; width: 100%;
    background: var(--surface); color: var(--ink);
    border: 1px solid rgba(60,60,67,.16); border-radius: 11px;
    padding: 10px 13px; font-size: 14px; font-family: inherit; line-height: 1.5;
    transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.sb-input::placeholder { color: var(--faint); }
.sb-input:focus {
    outline: none; border-color: var(--accent);
    background: rgba(255,255,255,.98);
    box-shadow: 0 0 0 4px rgba(0,113,227,.12);
}

/* ── flash 消息 ── */
.sb-flash {
    font-size: 12.5px; padding: 9px 14px; border-radius: 10px; line-height: 1.5;
}
.sb-flash.ok     { background: var(--ok-soft); color: #065f46; }
.sb-flash.warn   { background: var(--warn-soft); color: #92400e; }
.sb-flash.danger { background: var(--danger-soft); color: #991b1b; }

@media (prefers-reduced-motion: reduce) {
    .sb-btn, .sb-nav-link, .sb-main { transition: none; animation: none; }
}

/* 768px 的内置浏览器仍适合完整侧边栏；仅手机才收成横向导航。 */
@media (max-width: 620px) {
    .sb-nav { position:sticky; width:auto; height:58px; border-right:0; border-bottom:1px solid var(--hairline); overflow:hidden; }
    .sb-nav-inner { height:58px; padding:0 16px; flex-direction:row; align-items:center; }
    .sb-nav-logo { padding:0; font-size:15px; }.sb-nav-logo small,.sb-nav-group,.sb-nav-right{display:none}
    .sb-nav-left{display:flex;align-items:center;gap:18px;overflow:hidden}.sb-nav-links{flex-direction:row;overflow:auto;gap:2px}.sb-nav-link{padding:7px 8px;font-size:12px;white-space:nowrap}
    .sb-main{margin-left:0;padding:24px 18px 42px;}
}

@keyframes sb-page-in { from { opacity:0; transform:translateY(5px); } to { opacity:1; transform:translateY(0); } }

/* ============================================================
   学生端 · 成长陪伴组件
   （progress / next-action / stat / trend / empty / phase / greet）
   ============================================================ */

/* 问候区 */
.sb-greet { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.sb-greet h1 { font-size: 24px; font-weight: 700; letter-spacing: -.4px; margin: 0; color: var(--ink); line-height: 1.2; }
.sb-greet .sub { font-size: 13px; color: var(--muted); margin-top: 3px; }
.sb-greet-chips { display: flex; gap: 6px; flex-wrap: wrap; }

/* 大行动卡：现在最该做的一件事 */
.sb-next {
    position: relative; overflow: hidden;
    background: linear-gradient(140deg, var(--accent-soft) 0%, color-mix(in srgb, var(--accent-soft) 28%, var(--surface)) 100%);
    border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
    border-radius: 18px; padding: 22px 26px 22px 30px; margin-bottom: 22px;
}
.sb-next::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--accent); }
.sb-next-kicker { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.sb-next-title { font-size: 19px; font-weight: 700; color: var(--ink); margin: 5px 0 2px; letter-spacing: -.3px; }
.sb-next-desc { font-size: 13px; color: var(--muted); }
.sb-next-actions { display: flex; align-items: center; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.sb-next-extra { font-size: 12.5px; color: var(--muted); }

/* 区块 */
.sb-sec { margin-bottom: 26px; }
.sb-sec-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 13px; }
.sb-sec-title { font-size: 15px; font-weight: 700; color: var(--ink); letter-spacing: -.2px; }
.sb-sec-sub { font-size: 12px; color: var(--faint); }
.sb-sec-head .more { margin-left: auto; font-size: 12.5px; color: var(--accent); text-decoration: none; font-weight: 600; white-space: nowrap; }
.sb-sec-head .more:hover { text-decoration: underline; }

/* 统计块 */
.sb-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 22px; }
.sb-stat { background: var(--surface); border: 1px solid var(--hairline); border-radius: 14px; padding: 16px 18px; box-shadow: 0 1px 2px rgba(0,0,0,.03); }
.sb-stat .v { font-size: 26px; font-weight: 700; letter-spacing: -.5px; color: var(--ink); line-height: 1; font-variant-numeric: tabular-nums; }
.sb-stat .l { font-size: 12px; color: var(--muted); margin-top: 6px; }

/* 进度条 */
.sb-progress { position: relative; height: 9px; border-radius: 999px; background: color-mix(in srgb, var(--accent) 12%, transparent); overflow: hidden; }
.sb-progress > i { display: block; height: 100%; border-radius: 999px; background: var(--accent); transition: width .7s var(--ease); }
.sb-progress > i.warm { background: var(--warn); }
.sb-progress > i.ok { background: var(--ok); }

/* 趋势迷你柱状（模考走势） */
.sb-trend { display: flex; align-items: flex-end; gap: 12px; height: 92px; }
.sb-trend .bar { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; gap: 6px; height: 100%; }
.sb-trend .bar > i { width: 100%; max-width: 40px; border-radius: 7px 7px 3px 3px; background: var(--accent); transition: height .6s var(--ease); }
.sb-trend .bar > i.dim { background: color-mix(in srgb, var(--accent) 26%, transparent); }
.sb-trend .bar > i.warm { background: var(--warn); }
.sb-trend .bar .s { font-size: 12px; font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.sb-trend .bar .n { font-size: 10px; color: var(--faint); }

/* 空状态 */
.sb-empty { text-align: center; padding: 40px 20px; color: var(--faint); }
.sb-empty .g { font-size: 2.2em; margin-bottom: 6px; }
.sb-empty .t { font-size: 14px; color: var(--muted); }
.sb-empty .s { font-size: 12px; margin-top: 3px; }

/* 阶段分组标题（学习轨迹） */
.sb-phase { display: flex; align-items: center; gap: 10px; margin: 20px 0 10px; }
.sb-phase:first-child { margin-top: 0; }
.sb-phase .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.sb-phase .name { font-size: 13px; font-weight: 700; color: var(--ink); }
.sb-phase .n { font-size: 11px; color: var(--faint); }
.sb-phase::after { content: ''; flex: 1; height: 1px; background: var(--hairline); }