:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --muted: #64748b;
    --border: #e2e8f0;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #ca8a04;
    --th-bg: #f1f5f9;
    --footer-bg: #f1f5f9;
    --risk-high-bg: #fef2f2;
    --risk-mid-bg: #fefce8;
    --tag-buy-bg: #dcfce7;
    --tag-sell-bg: #fee2e2;
    --tag-hold-bg: #fef9c3;
    --average-bg: #f8fafc;
    --shadow: rgba(0, 0, 0, 0.1);
    --tab-bg: #f1f5f9;
    --tab-active-color: #ffffff;
}

body.dark {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #334155;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #eab308;
    --th-bg: #334155;
    --footer-bg: #1e293b;
    --risk-high-bg: rgba(239, 68, 68, 0.15);
    --risk-mid-bg: rgba(234, 179, 8, 0.15);
    --tag-buy-bg: rgba(34, 197, 94, 0.15);
    --tag-sell-bg: rgba(239, 68, 68, 0.15);
    --tag-hold-bg: rgba(234, 179, 8, 0.15);
    --average-bg: #1e293b;
    --shadow: rgba(0, 0, 0, 0.3);
    --tab-bg: #334155;
    --tab-active-color: #ffffff;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 13px;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    transition: background 0.2s, color 0.2s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 0.75rem;
}

.navbar {
    background: var(--primary);
    color: #fff;
    padding: 0.5rem 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    font-size: 1.15rem;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    font-size: 0.9rem;
}

.nav-links a:hover {
    text-decoration: underline;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 0.35rem 0.75rem;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.85rem;
    margin-left: 0.75rem;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
}

main.container {
    padding-top: 1rem;
    padding-bottom: 2rem;
    min-height: 70vh;
}

.hero {
    text-align: center;
    padding: 1.5rem 0;
}

.hero h1 {
    margin: 0 0 0.35rem;
    font-size: 1.5rem;
}

.hero p {
    color: var(--muted);
    font-size: 0.95rem;
    margin: 0;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 0.75rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    text-decoration: none;
    color: var(--text);
    transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
    box-shadow: 0 6px 10px -2px var(--shadow);
    transform: translateY(-1px);
}

.card h2 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
    color: var(--primary);
}

.card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.form-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    margin: 1rem 0;
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-group {
    flex: 1 1 160px;
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    font-size: 0.8rem;
    margin-bottom: 0.25rem;
}

.form-group input,
.form-group select {
    padding: 0.4rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    font-size: 0.85rem;
    background: var(--card-bg);
    color: var(--text);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.radio-group {
    display: flex;
    gap: 0.75rem;
    padding: 0.35rem 0;
}

.radio-group label {
    font-weight: normal;
    font-size: 0.85rem;
}

.btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 0.45rem 1.25rem;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.15s;
}

.btn:hover {
    background: var(--primary-dark);
}

.btn:disabled {
    background: #64748b;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 0.45rem 1.25rem;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.15s;
}

.btn-secondary:hover {
    background: var(--th-bg);
}

.loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.spinner {
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.toast {
    position: fixed;
    top: 1rem;
    right: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    color: #fff;
    font-size: 0.9rem;
    z-index: 1000;
    max-width: 320px;
    box-shadow: 0 4px 6px var(--shadow);
    transition: opacity 0.3s;
}

.toast-error { background: var(--danger); }
.toast-success { background: var(--success); }
.toast-info { background: var(--primary); }

.status-tags {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.status-tag {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    border-radius: 0.2rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-tag.st { background: var(--risk-high-bg); color: var(--danger); }
.status-tag.suspended { background: var(--risk-mid-bg); color: var(--warning); }
.status-tag.market { background: var(--th-bg); color: var(--muted); }

.alert {
    padding: 0.6rem 0.85rem;
    border-radius: 0.25rem;
    margin: 0.75rem 0;
    font-size: 0.85rem;
}

.alert-error {
    background: var(--risk-high-bg);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.alert-warning {
    background: var(--tag-buy-bg);
    color: var(--muted);
    border: 1px solid var(--border);
}

.table-wrapper {
    overflow-x: auto;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

th, td {
    padding: 0.55rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--th-bg);
    font-weight: 600;
}

tr:last-child td {
    border-bottom: none;
}

.score {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 0.1rem 0.4rem;
    border-radius: 0.2rem;
    font-weight: bold;
    font-size: 0.85rem;
}

.average-row {
    background: var(--average-bg);
    font-weight: 600;
}

.report {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-top: 1rem;
}

.report-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.75rem;
    margin-bottom: 0.75rem;
}

.score-box {
    text-align: center;
}

.score-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
}

.score-label {
    font-size: 0.8rem;
    color: var(--muted);
}

.section {
    margin-bottom: 1rem;
}

.section h3 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
    color: var(--primary);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
}

.risk-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.risk-list li {
    padding: 0.4rem 0.6rem;
    border-radius: 0.25rem;
    margin-bottom: 0.35rem;
    font-size: 0.85rem;
}

.risk-high {
    background: var(--risk-high-bg);
    color: var(--danger);
}

.risk-mid {
    background: var(--risk-mid-bg);
    color: var(--warning);
}

.tag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 0.2rem;
    font-size: 0.8rem;
    font-weight: 600;
}

.tag-buy {
    background: var(--tag-buy-bg);
    color: var(--success);
}

.tag-sell {
    background: var(--tag-sell-bg);
    color: var(--danger);
}

.tag-hold {
    background: var(--tag-hold-bg);
    color: var(--warning);
}

.footer {
    background: var(--footer-bg);
    color: var(--muted);
    text-align: center;
    padding: 0.75rem 0;
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
}

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

a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 0.5rem;
    }
    .nav-links {
        gap: 0.75rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    .theme-toggle {
        margin-left: 0;
    }
    .form-row {
        flex-direction: column;
    }
    .form-group {
        flex: 1 1 auto;
    }
    .grid {
        grid-template-columns: 1fr;
    }
    .table-wrapper {
        overflow-x: scroll;
        -webkit-overflow-scrolling: touch;
    }
    table {
        min-width: 600px;
    }
}

@media (max-width: 480px) {
    html { font-size: 12px; }
    .brand { font-size: 1rem; }
    .nav-links a { font-size: 0.8rem; }
}

.dupont-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
    margin: 0.75rem 0;
}

.dupont-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.75rem;
    text-align: center;
}

.dupont-value {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--primary);
}

.dupont-label {
    font-size: 0.8rem;
    color: var(--muted);
    margin-top: 0.25rem;
}

.valuation-range {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--muted);
}

.valuation-range .value-low {
    color: var(--success);
}

.valuation-range .value-high {
    color: var(--danger);
}