/* ================================================================
   StrokePath 智影随行 v3.0 — Medical Education SaaS Design
   Reference: brainmed.com · Blue clinical palette · High density
   ================================================================ */

/* ==================== 1. Design Tokens ==================== */
:root {
    /* Core palette — clinical blue, inspired by brainmed */
    --primary:       #1A6FFF;
    --primary-dark:  #1557D0;
    --primary-light: #E8F1FF;
    --accent:        #0EA5E9;
    --accent-light:  #E0F2FE;
    /* Surfaces */
    --bg-root:       #FFFFFF;
    --surface:       #FFFFFF;
    --surface-hover: #F7F8FA;
    --sidebar-bg:    #F7F8FA;
    --sidebar-hover: #EBEDF0;
    /* Text */
    --text:          #1A1A1A;
    --text-secondary:#4A5568;
    --text-muted:    #8896A6;
    --text-on-primary: #FFFFFF;
    --sidebar-text:  #4A5568;
    --sidebar-active:#1A6FFF;
    /* Borders */
    --border:        #E8ECF1;
    --border-light:  #F1F4F7;
    /* Status */
    --success:       #059669;
    --success-bg:    #ECFDF5;
    --warning:       #D97706;
    --warning-bg:    #FFFBEB;
    --danger:        #DC2626;
    --danger-bg:     #FEF2F2;
    --info-bg:       #EFF6FF;
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1A6FFF, #3B82F6);
    /* Shadows — subtle, for depth only where needed */
    --shadow-sm:    0 1px 2px rgba(0,0,0,0.04);
    --shadow-md:    0 4px 12px rgba(0,0,0,0.06);
    /* Radius */
    --radius-sm:    4px;
    --radius-md:    6px;
    --radius-lg:    10px;
    --radius-full:  9999px;
    /* Layout */
    --sidebar-w:    240px;
    --topbar-h:     52px;
    /* Typography — preserved from previous fix, DO NOT REVERT */
    --font-body:    system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono:    'JetBrains Mono', 'Cascadia Code', monospace;
    --text-xs:      0.925rem;   /* ~15px */
    --text-sm:      1.025rem;   /* ~16px */
    --text-base:    1.125rem;   /* 18px */
    --text-lg:      1.2rem;     /* ~19px */
    --text-xl:      1.35rem;    /* ~22px */
    --text-2xl:     1.7rem;     /* ~27px */
    --text-hero:    2rem;
    /* Transitions */
    --ease-out:     cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
}

/* ==================== 2. Reset & Base ==================== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
    margin: 0; padding: 0;
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--text);
    background: var(--bg-root);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color var(--duration-fast); }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; display: block; }
img { outline: 1px solid rgba(0,0,0,0.06); outline-offset: -1px; }

/* ==================== 3. Layout ==================== */
body.has-sidebar { padding-left: var(--sidebar-w); }

.main-content { padding: 24px 32px; max-width: 1400px; }
body.has-toolbar .main-content { padding-bottom: 72px; }

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex; align-items: center; gap: 6px;
    font-size: var(--text-xs); color: var(--text-muted); margin-bottom: 12px;
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; transition: color var(--duration-fast); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--text-muted); }
.breadcrumb span:last-child { color: var(--text); font-weight: 500; }

/* ==================== 4. Sidebar — light, brainmed-style ==================== */
.sidebar { display: none; }

@media (min-width: 1024px) {
    .sidebar {
        display: flex;
        flex-direction: column;
        position: fixed;
        left: 0; top: 0; bottom: 0;
        width: var(--sidebar-w);
        background: var(--sidebar-bg);
        border-right: 1px solid var(--border);
        z-index: 1000;
        overflow-y: auto;
    }
}

/* Sidebar brand */
.sidebar-brand {
    display: flex; align-items: center; gap: 12px;
    padding: 18px 16px;
    border-bottom: 1px solid var(--border);
}
.sidebar-brand .sb-logo {
    width: 36px; height: 36px; flex-shrink: 0;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: #FFF; font-weight: 700; font-size: 17px;
}
.sidebar-brand .sb-name { font-size: 15px; font-weight: 700; color: var(--text); line-height: 1.2; }
.sidebar-brand .sb-sub  { font-size: 11px; color: var(--text-muted); letter-spacing: 0.08em; }

/* Sidebar user */
.sidebar-user {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
}
.sidebar-user .su-avatar {
    width: 28px; height: 28px; flex-shrink: 0;
    background: var(--primary);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: #FFF; font-size: 12px; font-weight: 700;
}
.sidebar-user .su-name { font-size: var(--text-sm); color: var(--text); font-weight: 500; }
.sidebar-user .su-role { font-size: var(--text-xs); color: var(--text-muted); }
.sidebar-user .su-logout { margin-left: auto; font-size: var(--text-xs); color: var(--text-muted); cursor: pointer; transition: color var(--duration-fast); }
.sidebar-user .su-logout:hover { color: var(--danger); }

/* Sidebar nav */
.sidebar-nav {
    flex: 1; padding: 8px;
    display: flex; flex-direction: column; gap: 1px;
}
.sidebar-nav a {
    display: flex; align-items: center; gap: 8px;
    padding: 9px 12px; border-radius: var(--radius-sm);
    color: var(--sidebar-text); font-size: var(--text-sm); font-weight: 500;
    transition-property: color, background, border-color, box-shadow; transition-duration: var(--duration-fast); transition-timing-function: var(--ease-out);
    text-decoration: none;
}
.sidebar-nav a:hover { background: var(--sidebar-hover); color: var(--text); }
.sidebar-nav a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

/* Sidebar section */
.sidebar-section { padding: 12px 16px 0 16px; }
.sidebar-section .ss-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
.sidebar-section select, .sidebar-section input {
    width: 100%; padding: 8px 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text); font-size: var(--text-sm);
    font-family: var(--font-body);
    transition: border-color var(--duration-fast);
}
.sidebar-section select:focus, .sidebar-section input:focus {
    outline: none; border-color: var(--primary);
}

/* Sidebar steps */
.step-list { display: flex; flex-direction: column; gap: 1px; }
.step-item { font-size: var(--text-xs); padding: 3px 0; color: var(--text-muted); cursor: pointer; }
.step-item:hover { color: var(--primary); }
.step-item.done { color: var(--success); }
.step-item.active {
    color: var(--primary); font-weight: 600;
    background: var(--primary-light);
    border-left: 2px solid var(--primary);
    padding: 3px 10px; margin: 0 -10px; border-radius: 2px;
}

/* Sidebar actions */
.sidebar-actions { padding: 10px 16px; display: flex; gap: 6px; }
.sb-btn {
    flex: 1; padding: 8px 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary); font-size: var(--text-xs);
    cursor: pointer; text-align: center; font-family: var(--font-body);
    transition-property: color, background, border-color; transition-duration: var(--duration-fast);
}
.sb-btn:hover { background: var(--surface-hover); border-color: var(--primary); color: var(--primary); }
.sb-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* Sidebar footer */
.sidebar-footer {
    padding: 10px 16px; border-top: 1px solid var(--border);
    font-size: 11px; color: var(--text-muted);
}

/* ==================== 5. Cards ==================== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
}
.card-header { font-size: var(--text-lg); font-weight: 700; margin-bottom: 12px; color: var(--text); }

/* ==================== 6. Login Page ==================== */
body:not(.has-sidebar) {
    background: #F0F4FF;
}
body:not(.has-sidebar) .main-content {
    padding: 0;
    margin: 0;
    max-width: none;
}
.login-page {
    min-height: 100vh; min-height: 100dvh;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(180deg, #F0F4FF 0%, #E8F1FF 100%);
    position: relative; overflow: hidden;
}

.login-card {
    position: relative; z-index: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 48px 40px 36px 40px;
    width: 440px; max-width: 94vw;
    text-align: center;
}
.login-card .lc-logo {
    width: 48px; height: 48px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: inline-flex; align-items: center; justify-content: center;
    color: #FFF; font-size: 22px; font-weight: 700;
    margin-bottom: 16px;
}
.login-card h1 { font-size: var(--text-2xl); font-weight: 700; margin: 0 0 4px 0; white-space: nowrap; }
.login-card .lc-subtitle { color: var(--text-muted); font-size: var(--text-sm); margin-bottom: 24px; }

/* ==================== 7. Forms ==================== */
.form-group { margin-bottom: 16px; text-align: left; }
.form-label { display: block; font-size: var(--text-sm); font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-input {
    width: 100%; padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: var(--text-base); font-family: var(--font-body);
    color: var(--text); background: var(--surface);
    transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}
.form-input:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.form-input::placeholder { color: var(--text-muted); }

/* ==================== 8. Buttons ==================== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 20px; border-radius: var(--radius-sm);
    font-size: var(--text-sm); font-weight: 600; font-family: var(--font-body);
    cursor: pointer; border: 1px solid transparent;
    transition-property: color, background, border-color, box-shadow; transition-duration: var(--duration-fast); transition-timing-function: var(--ease-out);
    text-decoration: none;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
    background: var(--gradient-primary);
    color: #FFF;
    box-shadow: 0 1px 3px rgba(79,70,229,0.2);
}
.btn-primary:hover { box-shadow: 0 4px 12px rgba(79,70,229,0.35); transform: translateY(-1px); }
.btn-block { width: 100%; }
.btn-outline {
    background: var(--surface); border-color: var(--border); color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 6px 14px; font-size: var(--text-xs); }
.btn-danger { background: var(--danger); color: #FFF; }
.btn-danger:hover { background: #B91C1C; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ==================== 9. Tabs ==================== */
.tabs { display: flex; gap: 0; margin-bottom: 20px; border-bottom: 2px solid var(--border-light); }
.tab-btn {
    padding: 10px 20px; border: none; background: none;
    font-size: var(--text-sm); font-weight: 500; color: var(--text-muted);
    cursor: pointer; font-family: var(--font-body);
    border-bottom: 2px solid transparent; margin-bottom: -2px;
    transition-property: color, background, border-color; transition-duration: var(--duration-fast);
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ==================== 10. Alerts ==================== */
.alert {
    padding: 12px 16px; border-radius: var(--radius-sm);
    font-size: var(--text-sm); margin-bottom: 12px;
    border: 1px solid;
}
.alert-error   { background: var(--danger-bg);  color: var(--danger);  border-color: #FECACA; }
.alert-success { background: var(--success-bg); color: var(--success); border-color: #A7F3D0; }
.alert-warning { background: var(--warning-bg); color: var(--warning); border-color: #FDE68A; }
.alert-info    { background: var(--info-bg);    color: var(--primary); border-color: #C7D2FE; }

/* ==================== 11. Metrics ==================== */
.metrics { display: flex; gap: 20px; flex-wrap: wrap; }
.metric {
    background: var(--surface); border: 1px solid var(--border-light);
    border-radius: var(--radius-sm); padding: 14px 18px;
    min-width: 120px; flex: 1;
    transition: box-shadow var(--duration-fast);
}
.metric:hover { box-shadow: var(--shadow-md); }
.metric-label { font-size: var(--text-xs); color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.metric-value { font-size: var(--text-xl); font-weight: 700; color: var(--text); }

/* ==================== 12. Chat ==================== */
.chat-container {
    display: flex; flex-direction: column;
    border: 1px solid var(--border); border-radius: var(--radius-md);
    background: var(--surface); overflow: hidden;
    height: min(480px, 55vh);
}
.chat-header {
    padding: 12px 16px; border-bottom: 1px solid var(--border);
    font-size: var(--text-sm); font-weight: 600; color: var(--text-secondary);
}
.chat-messages {
    flex: 1; padding: 16px; overflow-y: auto;
    display: flex; flex-direction: column; gap: 10px;
}
.chat-msg {
    padding: 10px 14px; border-radius: var(--radius-sm);
    font-size: var(--text-sm); line-height: 1.6; max-width: 85%;
}
.chat-msg.assistant { background: var(--bg-root); border: 1px solid var(--border-light); align-self: flex-start; }
.chat-msg.user { background: var(--primary); color: #FFF; align-self: flex-end; }
.chat-input-row {
    padding: 12px 16px; border-top: 1px solid var(--border);
    display: flex; gap: 8px;
}
.chat-input {
    flex: 1; padding: 8px 12px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); font-size: var(--text-sm); font-family: var(--font-body);
}
.chat-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px rgba(79,70,229,0.1); }

/* ==================== 13. Viewer ==================== */
.viewer-toolbar { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 12px; }
.v-btn {
    padding: 6px 14px; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-full); font-size: var(--text-xs); color: var(--text-secondary);
    cursor: pointer; font-family: var(--font-body);
    transition-property: color, background, border-color; transition-duration: var(--duration-fast);
}
.v-btn:hover { border-color: var(--primary); color: var(--primary); }
.v-btn.active { background: var(--primary); color: #FFF; border-color: var(--primary); }
.viewer-area {
    flex: 1; background: var(--bg-root);
    border: 1px solid var(--border); border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted); font-size: var(--text-base);
    min-height: 360px; overflow: hidden; padding: 12px;
}
.v-btn:disabled {
    opacity: 0.45; cursor: not-allowed; color: var(--text-muted);
    border-color: var(--border-light); background: var(--surface-muted, #f5f5f5);
}
.v-btn:disabled:hover { color: var(--text-muted); border-color: var(--border-light); }
.viewer-placeholder { text-align: center; padding: 24px; color: var(--text-muted); font-size: var(--text-base); }
.case-select {
    padding: 5px 10px; border-radius: var(--radius); border: 1px solid var(--border);
    background: var(--surface); color: var(--text); font-size: var(--text-sm);
    font-family: var(--font-body); cursor: pointer; max-width: 280px;
}
.case-select:focus { outline: none; border-color: var(--primary); }

/* ==================== 14. Case Card ==================== */
.case-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px; margin-bottom: 16px;
}
.case-info-item .ci-label { font-size: 0.62rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 2px; }
.case-info-item .ci-value { font-size: var(--text-base); font-weight: 500; }
.case-info-item .ci-value.big { font-size: 1.3rem; font-weight: 700; }
.case-metrics { display: flex; gap: 24px; flex-wrap: wrap; padding-top: 12px; border-top: 1px solid var(--border-light); }

/* ==================== 15. Focus Bar ==================== */
.focus-bar {
    background: #EEF2FF; border: 1px solid #C7D2FE;
    border-radius: var(--radius-sm); padding: 12px 16px;
    font-size: var(--text-sm); margin-bottom: 16px;
}
.focus-bar strong { color: var(--primary-dark); }

/* ==================== 16. Utility ==================== */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; } .mb-3 { margin-bottom: 24px; }
.flex { display: flex; } .flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 8px; } .gap-2 { gap: 16px; }
.spinner {
    display: inline-block; width: 20px; height: 20px;
    border: 2px solid var(--border); border-top-color: var(--primary);
    border-radius: 50%; animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==================== 17. Shared Components ==================== */

/* ── Badge ── */
.badge {
    display:inline-block; font-size:var(--text-xs); font-weight:600;
    padding:3px 10px; border-radius:var(--radius-full);
    color:var(--text-on-primary); background:var(--primary);
}
.badge-success { background:var(--success); }
.badge-warning { background:var(--warning); }
.badge-danger  { background:var(--danger); }
.badge-muted   { background:var(--text-muted); }

/* ── Toast ── */
.toast-container { position:fixed; top:16px; right:16px; z-index:3000; display:flex; flex-direction:column; gap:8px; }
.toast {
    padding:10px 18px; border-radius:var(--radius-sm); font-size:var(--text-sm);
    color:#FFF; box-shadow:var(--shadow-md); animation:toastIn 0.3s var(--ease-out);
    max-width:360px;
}
.toast-success { background:var(--success); }
.toast-error   { background:var(--danger); }
.toast-warning { background:var(--warning); }
.toast-info    { background:var(--primary); }
@keyframes toastIn { from{opacity:0;transform:translateY(-8px)} to{opacity:1;transform:translateY(0)} }

/* ── Modal ── */
.modal-overlay { position:fixed; inset:0; z-index:2500; background:rgba(0,0,0,0.3); display:flex; align-items:center; justify-content:center; }
.modal-card { background:var(--surface); border-radius:var(--radius-md); padding:28px 32px; max-width:640px; width:94vw; max-height:85vh; overflow-y:auto; box-shadow:var(--shadow-md); }
.modal-card h2 { font-size:var(--text-xl); font-weight:700; margin:0 0 16px 0; }

/* ── Focus ring ── */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline:2px solid var(--primary); outline-offset:2px;
}

/* ── Disabled states ── */
input:disabled, select:disabled, textarea:disabled { opacity:0.5; cursor:not-allowed; background:var(--surface-hover); }
button:disabled { opacity:0.5; cursor:not-allowed; }

/* ── Knowledge Card components ── */
.kc-tags-row { display:flex; align-items:center; gap:4px; flex-wrap:wrap; margin-bottom:10px; }
.kc-kw-tag {
    padding:4px 12px; border:1px solid var(--border-light); border-radius:var(--radius-full);
    background:var(--surface-hover); color:var(--text-muted); font-size:var(--text-xs);
    cursor:pointer; font-family:var(--font-body); white-space:nowrap;
    transition-property: color, background, border-color; transition-duration: var(--duration-fast);
}
.kc-kw-tag:hover { border-color:var(--primary); color:var(--primary); background:var(--primary-light); }
.kc-kw-tag.active { background:var(--primary-light); color:var(--primary); border-color:var(--primary); font-weight:600; }

.kc-tabs { display:flex; gap:2px; flex-wrap:wrap; margin-bottom:14px; }
.kc-tab {
    padding:7px 16px; border:1px solid var(--border); border-radius:var(--radius-full);
    background:var(--surface); color:var(--text-secondary); font-size:var(--text-xs);
    cursor:pointer; font-family:var(--font-body); white-space:nowrap;
    transition-property: color, background, border-color; transition-duration: var(--duration-fast); transition-timing-function: var(--ease-out);
}
.kc-tab:hover { border-color:var(--primary); color:var(--primary); }
.kc-tab.active { background:var(--primary); color:var(--text-on-primary); border-color:var(--primary); font-weight:600; }

.kc-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.kc-card {
    background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
    overflow:hidden; cursor:pointer;
    transition-property: transform, box-shadow, border-color; transition-duration: 0.15s; transition-timing-function: var(--ease-out);
}
.kc-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); border-color:var(--primary-light); }
.kc-card:active { transform:scale(0.985); }
.kc-card-img-wrap { width:100%; height:140px; background:var(--bg-root); display:flex; align-items:center; justify-content:center; overflow:hidden; }
.kc-card-img { width:100%; height:100%; object-fit:cover; transition:transform 0.3s var(--ease-out); }
.kc-card:hover .kc-card-img { transform:scale(1.04); }
.kc-card-img-empty span { font-size:28px; opacity:0.3; }
.kc-card-body { padding:12px 14px; }
.kc-card-header { display:flex; justify-content:space-between; align-items:center; margin-bottom:4px; }
.kc-card-title {
    font-size:var(--text-base); font-weight:700; color:var(--text);
    line-height:1.4; margin-bottom:4px;
    display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
}
.kc-card-meta { font-size:var(--text-xs); color:var(--text-muted); margin-bottom:6px; }
.kc-card-tags { display:flex; gap:4px; flex-wrap:wrap; }
.kc-tag { font-size:var(--text-xs); padding:3px 8px; background:var(--bg-root); color:var(--text-muted); border-radius:var(--radius-full); font-weight:500; }
.kc-diff-badge { font-size:var(--text-xs); padding:3px 10px; border-radius:var(--radius-full); font-weight:600; white-space:nowrap; }

/* Category color left-borders */
.kc-card[data-cat="基础医学"] { border-left-color:#3B82F6; }
.kc-card[data-cat="临床路径"] { border-left-color:#14B8A6; }
.kc-card[data-cat="NCCT"] { border-left-color:#22C55E; }
.kc-card[data-cat="ASPECTS"] { border-left-color:#6366F1; }
.kc-card[data-cat="CTA"] { border-left-color:#8B5CF6; }
.kc-card[data-cat="CTP"] { border-left-color:#F59E0B; }
.kc-card[data-cat="MRI"] { border-left-color:#EF4444; }
.kc-card[data-cat="常见错误"] { border-left-color:#F97316; }
.kc-card[data-cat="指南证据"] { border-left-color:#64748B; }

.kc-detail-overlay {
    position:fixed; inset:0; z-index:2000;
    background:rgba(0,0,0,0.3); backdrop-filter:blur(4px);
    animation:kcFadeIn 0.2s var(--ease-out);
}
.kc-detail-overlay.hidden { display:none; }
@keyframes kcFadeIn { from{opacity:0} to{opacity:1} }
.kc-detail-panel {
    position:fixed; right:0; top:0; bottom:0; width:520px; max-width:94vw;
    background:var(--surface); box-shadow:-8px 0 40px rgba(0,0,0,0.1);
    padding:32px 28px; overflow-y:auto;
    animation:kcSlideIn 0.25s var(--ease-out);
}
@keyframes kcSlideIn { from{transform:translateX(100%)} to{transform:translateX(0)} }
.kc-detail-close {
    position:sticky; top:0; float:right; width:36px; height:36px;
    background:var(--bg-root); border:1px solid var(--border); border-radius:50%;
    font-size:20px; color:var(--text-muted);
    cursor:pointer; display:flex; align-items:center; justify-content:center;
    transition-property: color, background, border-color; transition-duration: var(--duration-fast); z-index:10;
}
.kc-detail-close:hover { background:var(--danger-bg); color:var(--danger); border-color:var(--danger); }
.kc-detail-img { width:100%; max-height:320px; object-fit:contain; border-radius:var(--radius-sm); margin-bottom:16px; }

@media (max-width:1199px) { .kc-grid { grid-template-columns:repeat(2,1fr); } .kc-detail-panel { width:440px; } }
@media (max-width:767px)  { .kc-grid { grid-template-columns:1fr; } .kc-detail-panel { width:100vw; max-width:100vw; } }

/* ── Sidebar tree & tools (consolidated) ── */
.kc-sidebar-tree { display:flex; flex-direction:column; gap:1px; margin-top:4px; }
.kc-sidebar-tree.collapsed { display:none; }
.kc-tree-item {
    display:flex; justify-content:space-between; align-items:center;
    padding:6px 10px; border-radius:var(--radius-sm);
    font-size:var(--text-xs); color:var(--sidebar-text); text-decoration:none;
    transition-property: color, background; transition-duration: var(--duration-fast);
}
.kc-tree-item:hover { background:var(--sidebar-hover); color:var(--text); }
.kc-tree-item.active { background:var(--primary-light); color:var(--primary); font-weight:600; }
.kc-tree-count { font-size:11px; color:var(--text-muted); background:var(--sidebar-hover); padding:1px 7px; border-radius:10px; }
.kc-tree-item.active .kc-tree-count { background:rgba(26,111,255,0.15); color:var(--primary); }
.kc-tools-grid { display:grid; grid-template-columns:1fr 1fr; gap:4px; margin-top:4px; }
.kc-tool-chip {
    display:flex; align-items:center; gap:4px; padding:6px 10px;
    border:1px solid var(--border); border-radius:var(--radius-md);
    font-size:var(--text-xs); color:var(--sidebar-text); text-decoration:none;
    transition-property: color, background, border-color; transition-duration: var(--duration-fast);
}
.kc-tool-chip:hover { border-color:var(--primary); color:var(--primary); background:var(--primary-light); }

/* ── Stats grid ── */
.stats-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(160px,1fr)); gap:12px; margin-bottom:16px; }
.stat-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:16px; }
.stat-card.primary  { border-left:4px solid var(--primary); }
.stat-card.purple  { border-left:4px solid #8B5CF6; }
.stat-card.green   { border-left:4px solid #10B981; }
.stat-card.amber   { border-left:4px solid #F59E0B; }
.stat-icon { font-size:24px; margin-bottom:6px; }
.stat-num  { font-size:var(--text-2xl); font-weight:700; color:var(--text); }
.stat-label{ font-size:var(--text-xs); color:var(--text-muted); margin-top:2px; }

.nav-cards-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin-top:16px; }
@media (max-width:1023px) { .nav-cards-grid { grid-template-columns:repeat(2,1fr); } }
.nav-card {
    background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
    padding:18px; text-decoration:none; color:var(--text);
    transition-property: transform, box-shadow, border-color; transition-duration: var(--duration-fast); transition-timing-function: var(--ease-out);
}
.nav-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); border-color:var(--primary-light); }
.nav-card-icon { font-size:24px; margin-bottom:8px; }
.nav-card-title { font-size:var(--text-sm); font-weight:600; margin-bottom:4px; color:var(--text); }
.nav-card-desc { font-size:var(--text-xs); color:var(--text-muted); }

/* ── Shared list row (student list, entity type list) ── */
.list-row { padding:12px 16px; cursor:pointer; border-bottom:1px solid var(--border-light); display:flex; align-items:center; transition:background 0.15s; }
.list-row:hover { background:var(--bg-root); }
.list-row.active { background:var(--bg-root); border-left:3px solid var(--primary); }
.list-row.type-row { justify-content:space-between; }

/* ── ASPECTS Scoring Grid ── */
.aspects-grid { display:grid; grid-template-columns:repeat(5,1fr); gap:8px; }
.aspect-item { background:var(--surface); border:1px solid var(--border-light); border-radius:var(--radius-sm); padding:12px 10px; text-align:center; transition:border-color 0.2s; }
.aspect-item.active { border-color:var(--success); }
.aspect-item.abnormal { border-color:var(--danger); }
.ai-name { font-size:var(--text-sm); font-weight:600; color:var(--text); }
.ai-desc { font-size:var(--text-xs); color:var(--text-muted); margin:2px 0; }
.ai-layer { font-size:10px; color:var(--text-muted); margin-bottom:8px; }
.ai-btns { display:flex; gap:4px; }
.ai-btn { flex:1; padding:4px 2px; border:1px solid var(--border); border-radius:4px; font-size:10px; cursor:pointer; background:var(--bg-root); color:var(--text-muted); }
.ai-btn.normal.active { background:var(--success); color:var(--text-on-primary); border-color:var(--success); }
.ai-btn.abnormal.active { background:var(--danger); color:var(--text-on-primary); border-color:var(--danger); }
@media(max-width:768px) { .aspects-grid { grid-template-columns:repeat(3,1fr); } }

/* ── Training toolbar ── */
.training-toolbar {
    position:fixed; bottom:0; left:var(--sidebar-w); right:0; z-index:900;
    display:flex; align-items:center; justify-content:center; gap:12px;
    padding:10px 24px;
    background:rgba(255,255,255,0.95); backdrop-filter:blur(8px);
    border-top:1px solid var(--border);
    box-shadow:0 -2px 12px rgba(0,0,0,0.04);
}
.tt-btn {
    padding:8px 20px; border:1px solid var(--border); border-radius:var(--radius-sm);
    background:var(--surface); color:var(--text-secondary); font-size:var(--text-sm);
    cursor:pointer; font-family:var(--font-body); text-decoration:none;
    transition-property: color, background, border-color, transform;
    transition-duration: var(--duration-fast); transition-timing-function: var(--ease-out);
    display:inline-flex; align-items:center; gap:4px;
}
.tt-btn:hover { border-color:var(--primary); color:var(--primary); }
.tt-btn:active { transform:scale(0.97); }
.tt-btn-primary { background:var(--primary); color:var(--text-on-primary); border-color:var(--primary); font-weight:600; }
.tt-btn-primary:hover { background:var(--primary-dark); color:var(--text-on-primary); }
.tt-btn-help { border-color:var(--warning); color:var(--warning); }
.tt-btn-help:hover { background:var(--warning-bg); }
.tt-btn-accent { border-color:var(--primary); color:var(--primary); font-weight:600; }
.tt-btn-accent:hover { background:var(--primary-light); }
@media (max-width:1023px) {
    .training-toolbar { left:0; padding:8px 12px; gap:8px; }
    .tt-btn { padding:6px 12px; font-size:var(--text-xs); }
}

/* ==================== 18. Mobile ==================== */
.mobile-topbar { display:none; }

@media (max-width: 1023px) {
    body.has-sidebar { padding-left: 0; padding-top: var(--topbar-h); }
    .sidebar { display: none; }
    .mobile-topbar {
        display: flex; align-items: center;
        height: var(--topbar-h); padding: 0 12px; gap: 8px;
        background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
        position: fixed; top: 0; left: 0; right: 0; z-index: 500;
    }
    .login-card { padding: 32px 24px 28px 24px; }
    .main-content { padding: 16px; }
    .case-info-grid { grid-template-columns: repeat(2, 1fr); }
}