:root {
    --fc-bg: #0f172a;
    --fc-card: #1e293b;
    --fc-card-hi: #2a3a52;
    --fc-border: #334155;
    --fc-text: #e2e8f0;
    --fc-text-mute: #94a3b8;
    --fc-accent: #818cf8;
    --fc-accent-solid: #6366f1;
    --fc-accent-bg: rgba(99,102,241,0.15);
    --fc-success: #34d399;
    --fc-warning: #fbbf24;
    --fc-danger: #ef4444;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
    background: var(--fc-bg); color: var(--fc-text); min-height: 100vh;
}
.fc-fullscreen { min-height: 100vh; display: flex; flex-direction: column; }
.fc-header {
    background: rgba(15,23,42,0.85); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--fc-border); height: 56px;
    padding: 0 16px; display: flex; align-items: center; gap: 12px;
    position: sticky; top: 0; z-index: 100;
}
.fc-back { color: var(--fc-text-mute); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
.fc-back:hover { color: var(--fc-text); }
.fc-title { font-size: 16px; font-weight: 600; }
.fc-spacer { flex: 1; }

.fc-main { flex: 1; padding: 24px 16px 60px; max-width: 880px; width: 100%; margin: 0 auto; }
.fc-card { background: var(--fc-card); border: 1px solid var(--fc-border); border-radius: 16px; padding: 22px; }

.fc-tabs {
    display: flex; gap: 4px; background: var(--fc-bg);
    border: 1px solid var(--fc-border); border-radius: 10px;
    padding: 4px; margin-bottom: 20px;
}
.fc-tab {
    flex: 1; background: transparent; color: var(--fc-text-mute);
    border: none; padding: 9px 8px; border-radius: 7px; cursor: pointer;
    font-size: 14px; font-family: inherit;
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.fc-tab:hover { color: var(--fc-text); }
.fc-tab.active { background: var(--fc-accent-bg); color: var(--fc-accent); font-weight: 500; }

.fc-pane.hidden { display: none; }

.fc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 16px; }
@media (max-width: 540px) { .fc-grid { grid-template-columns: 1fr; } }

.fc-row { }
.fc-label { display: block; font-size: 13px; color: var(--fc-text-mute); margin-bottom: 6px; }
.fc-input {
    width: 100%; padding: 11px 14px; border-radius: 8px;
    background: var(--fc-bg); border: 1px solid var(--fc-border);
    color: var(--fc-text); font-size: 14px; font-family: inherit;
    outline: none; transition: border-color .15s, box-shadow .15s;
}
.fc-input:focus { border-color: var(--fc-accent-solid); box-shadow: 0 0 0 3px var(--fc-accent-bg); }
.fc-hint { font-size: 11px; color: var(--fc-text-mute); margin-top: 4px; }

select.fc-input { cursor: pointer; }

.fc-segment {
    display: inline-flex; gap: 4px;
    background: var(--fc-bg); border: 1px solid var(--fc-border);
    border-radius: 8px; padding: 3px;
    width: 100%;
}
.fc-seg {
    flex: 1; background: transparent; color: var(--fc-text-mute);
    border: none; padding: 7px 10px; border-radius: 5px;
    cursor: pointer; font-size: 13px; font-family: inherit;
}
.fc-seg:hover { color: var(--fc-text); }
.fc-seg.active { background: var(--fc-accent-bg); color: var(--fc-accent); font-weight: 500; }

.fc-result {
    margin-top: 8px; padding: 18px;
    background: linear-gradient(180deg, var(--fc-card-hi), var(--fc-card));
    border: 1px solid var(--fc-border); border-radius: 12px;
}
.fc-result-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px; margin-bottom: 16px;
}
.fc-stat { padding: 12px; background: var(--fc-bg); border: 1px solid var(--fc-border); border-radius: 8px; }
.fc-stat-label { font-size: 11px; color: var(--fc-text-mute); margin-bottom: 4px; }
.fc-stat-num {
    font-size: 22px; font-weight: 600; color: var(--fc-accent);
    font-variant-numeric: tabular-nums; line-height: 1.2; word-break: break-all;
}
.fc-stat-num.lg { font-size: 28px; color: var(--fc-warning); }
.fc-stat-sub { font-size: 11px; color: var(--fc-text-mute); margin-top: 2px; }

.fc-result-table {
    max-height: 280px; overflow-y: auto;
    border-top: 1px solid var(--fc-border); padding-top: 12px;
}
.fc-result-table-title {
    font-size: 13px; color: var(--fc-text-mute); margin-bottom: 8px;
    display: flex; justify-content: space-between; align-items: center;
}
.fc-result-table table { width: 100%; border-collapse: collapse; font-size: 12px; }
.fc-result-table th {
    text-align: left; padding: 6px 8px; color: var(--fc-text-mute); font-weight: 500;
    border-bottom: 1px solid var(--fc-border); position: sticky; top: 0; background: var(--fc-card);
}
.fc-result-table td {
    padding: 6px 8px; border-bottom: 1px solid var(--fc-border);
    font-variant-numeric: tabular-nums;
}
.fc-result-table tbody tr:nth-child(12n+1) td { background: rgba(99,102,241,0.05); }

/* 汇率 */
.fc-rate-row { display: flex; gap: 8px; margin-bottom: 8px; }
.fc-rate-input { flex: 2; font-size: 18px; font-weight: 500; }
.fc-rate-curr { flex: 1; cursor: pointer; }
.fc-rate-arrow { text-align: center; font-size: 22px; color: var(--fc-text-mute); margin: 8px 0; }
.fc-rate-targets { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.fc-rate-target {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 16px;
    background: var(--fc-card-hi); border: 1px solid var(--fc-border);
    border-radius: 10px;
}
.fc-rate-target-curr { flex: 0 0 110px; font-size: 13px; color: var(--fc-text-mute); }
.fc-rate-target-val {
    flex: 1; text-align: right; font-size: 20px; font-weight: 600;
    color: var(--fc-accent); font-variant-numeric: tabular-nums;
    word-break: break-all;
}
.fc-rate-target-del { background: none; border: none; color: var(--fc-text-mute); cursor: pointer; padding: 0 6px; }
.fc-rate-target-del:hover { color: var(--fc-danger); }
.fc-rate-add { display: flex; gap: 8px; background: var(--fc-bg); border: 1px dashed var(--fc-border); border-radius: 10px; padding: 12px; }
.fc-rate-add .fc-input { flex: 1; }
.fc-rate-meta { margin-top: 12px; font-size: 12px; color: var(--fc-text-mute); }

.fc-btn {
    background: transparent; color: var(--fc-text);
    border: 1px solid var(--fc-border); padding: 9px 14px;
    border-radius: 8px; cursor: pointer; font-size: 13px; font-family: inherit;
    display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
}
.fc-btn:hover { background: var(--fc-card-hi); border-color: var(--fc-accent-solid); }
.fc-btn-primary { background: var(--fc-accent-solid); color: #fff; border-color: var(--fc-accent-solid); }
.fc-btn-primary:hover { background: var(--fc-accent); }

.fc-foot {
    margin-top: 18px; padding: 12px 16px;
    background: rgba(251,191,36,0.06); border: 1px solid rgba(251,191,36,0.2);
    border-radius: 8px; color: var(--fc-warning); font-size: 12px;
}
.fc-seo {
    margin-top: 32px; padding: 20px 24px;
    background: var(--fc-card); border: 1px solid var(--fc-border);
    border-radius: 12px; color: var(--fc-text-mute); font-size: 14px; line-height: 1.7;
}
.fc-seo h2 { color: var(--fc-text); font-size: 16px; margin-bottom: 10px; }
.fc-seo b { color: var(--fc-text); font-weight: 500; }