/**
 * 学生端 UI 契约 — Design Tokens + 公共列表布局
 * 与 student-subpages.css (--sp-*) 并存；预习模块复用 --ph-* 别名
 * @see docs/design-ui-consistency-plan.md
 */
:root {
    --ph-primary: var(--sp-accent, var(--student-shell-primary, #8b4d3b));
    --ph-secondary: var(--sp-secondary, #2d5c5c);
    --ph-page-bg: var(--sp-page-bg, #f3f1ed);
    --ph-surface: var(--sp-surface, #ffffff);
    --ph-text: var(--sp-text, #2c2825);
    --ph-text-muted: var(--sp-text-muted, #6b6560);
    --ph-border: var(--sp-border, #e3ded6);
    --ph-radius-card: var(--sp-radius-lg, 14px);
    --ph-radius-md: var(--sp-radius-md, 10px);
    --ph-radius-pill: 999px;
    --ph-shadow-sm: var(--sp-shadow-sm, 0 1px 2px rgba(44, 40, 37, 0.04));
    --ph-shadow-md: var(--sp-shadow-md, 0 4px 12px rgba(44, 40, 37, 0.07));
    --ph-success: #2e7d4f;
    --ph-warning: #c17a00;
    --ph-danger: #b33a3a;
}

.student-page-body {
    background: var(--ph-page-bg);
    min-height: 40vh;
}

.public-page-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 16px 48px;
}

.public-page-header {
    margin-bottom: 20px;
}

.public-page-header .title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--ph-text);
    margin: 0 0 6px;
}

.public-page-header .subtitle {
    font-size: 0.9rem;
    color: var(--ph-text-muted);
    margin: 0;
}

.public-tag-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.public-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: var(--ph-radius-pill);
    border: 1px solid var(--ph-border);
    background: var(--ph-surface);
    color: var(--ph-text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.public-tag:hover,
.public-tag.is-active {
    border-color: var(--ph-primary);
    color: var(--ph-primary);
    background: color-mix(in srgb, var(--ph-primary) 8%, transparent);
}

.public-list-item {
    display: block;
    padding: 14px 16px;
    margin-bottom: 10px;
    background: var(--ph-surface);
    border: 1px solid var(--ph-border);
    border-radius: var(--ph-radius-card);
    box-shadow: var(--ph-shadow-sm);
    color: var(--ph-text);
    text-decoration: none;
    transition: box-shadow 0.15s, border-color 0.15s;
}

.public-list-item:hover {
    box-shadow: var(--ph-shadow-md);
    border-color: color-mix(in srgb, var(--ph-primary) 25%, var(--ph-border));
}

.public-list-item__title {
    font-weight: 600;
    margin-bottom: 4px;
}

.public-list-item__meta {
    font-size: 12px;
    color: var(--ph-text-muted);
}

.student-course-card {
    display: flex;
    flex-direction: column;
    background: var(--ph-surface);
    border: 1px solid var(--ph-border);
    border-radius: var(--ph-radius-card);
    box-shadow: var(--ph-shadow-sm);
    overflow: hidden;
    height: 100%;
}

.student-course-card__status {
    font-size: 11px;
    padding: 4px 10px;
    background: color-mix(in srgb, var(--ph-primary) 10%, transparent);
    color: var(--ph-primary);
}

.student-course-card__title {
    padding: 12px 14px 4px;
    font-weight: 600;
    color: var(--ph-text);
}

.student-course-card__meta {
    padding: 0 14px 12px;
    font-size: 12px;
    color: var(--ph-text-muted);
    flex: 1;
}

.student-course-card__btn {
    margin: 0 14px 14px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 10px 16px;
    border-radius: var(--ph-radius-md);
    background: var(--ph-primary);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.student-course-card__btn:hover {
    filter: brightness(0.95);
    color: #fff;
}