/* ═══════════════════════════════════════
   雪球研究站 — 全局样式
   投资研究风格，干净、专业、信息密度高
   ═══════════════════════════════════════ */

/* ─── Reset & Base ─── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg:        #f5f7fa;
    --bg-card:   #ffffff;
    --bg-nav:    #1a2332;
    --text:      #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border:    #e5e7eb;
    --accent:    #2563eb;
    --accent-hover: #1d4ed8;
    --green:     #059669;
    --red:       #dc2626;
    --orange:    #d97706;
    --radius:    12px;
    --shadow:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --shadow-lg: 0 4px 6px rgba(0,0,0,.07), 0 10px 15px rgba(0,0,0,.1);
    --font:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* ─── Navbar ─── */
.navbar {
    background: var(--bg-nav);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,.2);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    height: 56px;
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-brand {
    font-size: 18px;
    font-weight: 700;
    color: #fff !important;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 4px;
    flex: 1;
}

.nav-links a {
    color: rgba(255,255,255,.7);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    transition: all .15s;
}

.nav-links a:hover {
    color: #fff;
    background: rgba(255,255,255,.1);
}

.nav-links a.active {
    color: #fff;
    background: rgba(255,255,255,.15);
    font-weight: 600;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 22px;
    cursor: pointer;
    padding: 4px;
}

/* ─── Container ─── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 20px;
    flex: 1;
    width: 100%;
}

.page-header {
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ─── Stats Grid ─── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ─── Modules Grid ─── */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.module-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    transition: transform .15s, box-shadow .15s;
    color: var(--text) !important;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.module-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.module-icon {
    font-size: 32px;
    margin-bottom: 4px;
}

.module-card h2 {
    font-size: 18px;
    font-weight: 600;
}

.module-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
    flex: 1;
}

.module-count {
    font-size: 13px;
    color: var(--accent);
    font-weight: 500;
}

/* ─── Section ─── */
.section {
    margin-bottom: 40px;
}

.section h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}

/* ─── Post List ─── */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.post-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
    transition: box-shadow .15s;
}

.post-card:hover {
    box-shadow: var(--shadow-lg);
}

.post-card .post-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.post-card .post-meta {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 8px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.post-card .post-preview {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-card .post-stats {
    display: flex;
    gap: 16px;
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-light);
}

.post-card .post-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.post-category {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
}

.post-category.deep   { background: #fef3c7; color: #92400e; }
.post-category.normal { background: #dbeafe; color: #1e40af; }
.post-category.short  { background: #e5e7eb; color: #4b5563; }

/* ─── Investor Grid ─── */
.investor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.investor-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: box-shadow .15s;
    cursor: pointer;
}

.investor-card:hover {
    box-shadow: var(--shadow-lg);
}

.investor-card .investor-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.investor-card .investor-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.investor-card .investor-stats strong {
    color: var(--text);
}

/* ─── Placeholder Module ─── */
.placeholder-module {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 48px 32px;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}

.placeholder-icon {
    font-size: 56px;
    margin-bottom: 16px;
}

.placeholder-module h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.placeholder-module > p {
    color: var(--text-secondary);
    font-size: 15px;
    max-width: 500px;
    margin: 0 auto 24px;
}

.placeholder-features {
    list-style: none;
    max-width: 400px;
    margin: 0 auto 24px;
    text-align: left;
}

.placeholder-features li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}

.placeholder-features li:last-child {
    border-bottom: none;
}

.placeholder-note {
    background: #fef3c7;
    border-radius: 8px;
    padding: 12px 16px;
    max-width: 500px;
    margin: 0 auto;
    font-size: 13px;
    color: #92400e;
}

/* ─── Toolbar ─── */
.toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color .15s;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

.sort-select {
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    background: var(--bg-card);
    outline: none;
    cursor: pointer;
}

/* ─── Back Button ─── */
.back-btn {
    background: none;
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    color: var(--text-secondary);
    margin-bottom: 16px;
    transition: all .15s;
}

.back-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ─── Investor Detail ─── */
.investor-detail {
    margin-top: 8px;
}

.detail-header {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.detail-header h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.detail-stats {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.detail-stats .stat {
    text-align: center;
}

.detail-stats .stat-value {
    font-size: 24px;
}

.detail-stats .stat-label {
    font-size: 12px;
}

/* ─── Guide Cards ─── */
.guide-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.guide-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.guide-card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}

.guide-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ─── Footer ─── */
.footer {
    background: var(--bg-nav);
    color: rgba(255,255,255,.5);
    padding: 24px 0;
    margin-top: auto;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
    font-size: 13px;
}

.footer-updated {
    margin-top: 4px;
    font-size: 12px;
}

/* ─── Loading & Empty ─── */
.loading {
    color: var(--text-light);
    font-size: 14px;
    text-align: center;
    padding: 24px;
}

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-light);
}

.empty-state .empty-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--bg-nav);
        flex-direction: column;
        padding: 8px;
        gap: 2px;
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: block; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .modules-grid { grid-template-columns: 1fr; }
    .investor-grid { grid-template-columns: 1fr; }

    .page-header h1 { font-size: 24px; }
    .stat-value { font-size: 26px; }
}