/* ============================================================
   房贷计算器 · Editorial Finance Aesthetic
   ============================================================ */

:root {
    /* Color palette — warm parchment with crimson accent */
    --bg: #F7F3EA;
    --bg-deep: #EDE6D2;
    --surface: #FDFBF5;
    --surface-2: #F2EBDA;
    --ink: #1A1814;
    --ink-soft: #3D362C;
    --muted: #7A6F5F;
    --muted-2: #B3A892;
    --accent: #8B2C2C;
    --accent-hover: #6E2222;
    --accent-soft: #C76B5F;
    --gold: #B89060;
    --border: #DDD3BC;
    --border-strong: #C5B89B;
    --positive: #2F6B3D;
    --negative: #8B2C2C;

    --font-display: 'Fraunces', 'Noto Serif SC', Georgia, serif;
    --font-body: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Helvetica Neue', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

    --radius: 2px;
    --shadow-sm: 0 1px 2px rgba(26, 24, 20, 0.04);
    --shadow-md: 0 2px 8px rgba(26, 24, 20, 0.06);
    --shadow-lg: 0 6px 24px rgba(26, 24, 20, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.55;
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 12% 18%, rgba(184, 144, 96, 0.06) 0%, transparent 38%),
        radial-gradient(circle at 88% 78%, rgba(139, 44, 44, 0.04) 0%, transparent 42%);
}

.container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }

/* ============ MASTHEAD ============ */
.masthead {
    border-bottom: 1px solid var(--border);
    padding: 56px 0 36px;
    background: linear-gradient(180deg, var(--surface) 0%, transparent 100%);
    position: relative;
}
.masthead::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--gold) 50%, var(--accent) 100%);
}
.masthead .container {
    display: flex; justify-content: space-between; align-items: flex-end;
    gap: 48px; flex-wrap: wrap;
}
.title-block { flex: 1; min-width: 320px; }
.kicker {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.22em;
    text-transform: uppercase; color: var(--accent); margin-bottom: 14px; font-weight: 500;
}
h1 {
    font-family: var(--font-display); font-weight: 600;
    font-size: clamp(2.6rem, 5.5vw, 4.2rem);
    line-height: 0.95; letter-spacing: -0.02em; color: var(--ink);
    font-variation-settings: "opsz" 120;
}
h1 em {
    font-style: italic; font-weight: 400; color: var(--accent);
    font-variation-settings: "opsz" 144;
}
.subtitle {
    margin-top: 14px; color: var(--muted); font-size: 0.94rem;
    font-weight: 300; max-width: 560px;
}
.meta-block {
    display: flex; flex-direction: column; gap: 8px;
    padding: 14px 18px; border-left: 2px solid var(--accent);
    background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0;
}
.meta-item { display: flex; flex-direction: column; }
.meta-label {
    font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.16em;
    text-transform: uppercase; color: var(--muted); font-weight: 500;
}
.meta-value {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft);
    font-weight: 500;
}

/* ============ TABS ============ */
.tabs {
    border-bottom: 1px solid var(--border); background: var(--bg);
    position: sticky; top: 0; z-index: 10;
    backdrop-filter: saturate(140%) blur(8px);
}
.tabs .container {
    display: flex; gap: 4px; overflow-x: auto;
    scrollbar-width: none;
}
.tabs .container::-webkit-scrollbar { display: none; }
.tab {
    background: transparent; border: none; padding: 18px 22px;
    font-family: var(--font-body); font-size: 0.92rem; font-weight: 500;
    color: var(--muted); cursor: pointer; white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ============ PANELS ============ */
main { padding: 48px 32px 80px; }
@media (max-width: 768px) { main { padding: 32px 0 60px; } }
.panel { display: none; animation: fadeIn 0.3s ease; }
.panel.active { display: block; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    font-family: var(--font-display); font-weight: 500; font-size: 1.8rem;
    letter-spacing: -0.01em; margin-bottom: 24px; color: var(--ink);
    font-variation-settings: "opsz" 96;
}
h3 {
    font-family: var(--font-display); font-weight: 500; font-size: 1.15rem;
    margin: 28px 0 12px; color: var(--ink-soft);
    font-variation-settings: "opsz" 36;
}
.muted { color: var(--muted); font-weight: 400; font-size: 0.85em; }

/* ============ LAYOUT ============ */
.layout {
    display: grid; grid-template-columns: 360px 1fr; gap: 56px;
    align-items: flex-start;
}
@media (max-width: 980px) { .layout { grid-template-columns: 1fr; gap: 40px; } }

/* ============ INPUTS ============ */
.inputs h2 { margin-bottom: 28px; }
fieldset {
    border: none; padding: 0; margin: 0 0 28px;
}
legend {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.18em;
    text-transform: uppercase; color: var(--accent); font-weight: 500;
    padding-bottom: 10px; margin-bottom: 14px;
    border-bottom: 1px solid var(--border); width: 100%; display: block;
}
label {
    display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px;
}
label span {
    font-size: 0.85rem; color: var(--ink-soft); font-weight: 500;
}
label em {
    font-style: normal; color: var(--muted); font-weight: 400;
    font-size: 0.78em; margin-left: 2px;
}
input, select {
    font-family: var(--font-mono); font-size: 0.95rem;
    padding: 10px 12px; background: var(--surface);
    border: 1px solid var(--border); border-radius: var(--radius);
    color: var(--ink); width: 100%;
    transition: border-color 0.15s ease, background 0.15s ease;
}
input:hover, select:hover { border-color: var(--border-strong); }
input:focus, select:focus {
    outline: none; border-color: var(--accent); background: #fff;
    box-shadow: 0 0 0 3px rgba(139, 44, 44, 0.08);
}
select {
    appearance: none; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%237A6F5F' d='M6 8L0 0h12z'/></svg>");
    background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px;
}
.computed {
    display: flex; justify-content: space-between; align-items: baseline;
    padding: 10px 12px; background: var(--surface-2); border-radius: var(--radius);
    margin-top: 4px;
}
.computed span:first-child { color: var(--muted); font-size: 0.85rem; }
.computed .num { font-family: var(--font-mono); color: var(--accent); font-weight: 600; }
.hidden { display: none !important; }

button {
    font-family: var(--font-body); cursor: pointer;
    transition: all 0.15s ease;
}
.primary-btn, #computePrepay, #exportCsv, #setToday {
    padding: 10px 18px; background: var(--ink); color: var(--surface);
    border: 1px solid var(--ink); border-radius: var(--radius);
    font-size: 0.88rem; font-weight: 500; letter-spacing: 0.02em;
}
.primary-btn:hover, #computePrepay:hover, #exportCsv:hover, #setToday:hover {
    background: var(--accent); border-color: var(--accent);
}
#setToday { padding: 8px 16px; font-size: 0.82rem; }

/* ============ RESULTS ============ */
.results h2 { margin-bottom: 28px; }
.result-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1px; background: var(--border);
    border: 1px solid var(--border); border-radius: var(--radius);
    overflow: hidden; margin-bottom: 32px;
}
.result-card {
    background: var(--surface); padding: 24px 22px;
    transition: background 0.15s ease;
}
.result-card:hover { background: #fff; }
.result-card.primary { background: var(--ink); color: var(--surface); }
.result-card.primary:hover { background: var(--accent); }
.result-card.primary .result-label { color: var(--muted-2); }
.result-card.primary .result-value { color: var(--surface); }
.result-card.primary .result-sub { color: var(--muted-2); }
.result-label {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--muted); font-weight: 500;
    margin-bottom: 12px;
}
.result-label em { font-style: normal; color: var(--muted-2); text-transform: none; letter-spacing: 0; font-size: 0.92em; }
.result-value {
    font-family: var(--font-mono); font-size: 1.45rem; font-weight: 600;
    color: var(--ink); letter-spacing: -0.01em; line-height: 1.15;
    word-break: break-all;
}
.result-sub {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted);
    margin-top: 6px;
}
.result-section { margin-top: 36px; }

/* ============ KEY-VALUE TABLES ============ */
table.kv {
    width: 100%; border-collapse: collapse; background: var(--surface);
    border: 1px solid var(--border); border-radius: var(--radius);
}
table.kv tr { border-bottom: 1px solid var(--border); }
table.kv tr:last-child { border-bottom: none; }
table.kv th, table.kv td {
    padding: 12px 18px; text-align: left; font-weight: 400;
}
table.kv th {
    color: var(--muted); font-size: 0.86rem;
    width: 50%; font-weight: 500;
}
table.kv td.num {
    font-family: var(--font-mono); text-align: right; color: var(--ink);
    font-size: 0.92rem; font-weight: 500;
}
.formula {
    font-family: var(--font-mono); font-size: 0.85rem;
    color: var(--accent); text-align: right;
}

/* ============ CURRENT STATUS ============ */
.status-controls {
    display: flex; align-items: flex-end; gap: 24px; flex-wrap: wrap;
    padding-bottom: 24px; margin-bottom: 32px;
    border-bottom: 1px solid var(--border);
}
.status-controls h2 { margin-bottom: 0; flex: 1; min-width: 200px; }
.status-controls label { margin-bottom: 0; min-width: 200px; }
.status-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1px; background: var(--border);
    border: 1px solid var(--border); border-radius: var(--radius);
    overflow: hidden; margin-bottom: 40px;
}
.status-card {
    background: var(--surface); padding: 24px 22px;
}
.status-card.highlight { background: var(--ink); color: var(--surface); }
.status-card.highlight .status-label { color: var(--muted-2); }
.status-card.highlight .status-value { color: var(--surface); }
.status-card.highlight .status-sub { color: var(--muted-2); }
.status-label {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--muted); font-weight: 500;
    margin-bottom: 12px;
}
.status-value {
    font-family: var(--font-mono); font-size: 1.45rem; font-weight: 600;
    color: var(--ink); letter-spacing: -0.01em; line-height: 1.15;
    word-break: break-all;
}
.status-sub {
    font-family: var(--font-mono); font-size: 0.78rem; color: var(--muted);
    margin-top: 6px;
}
.progress-bar {
    margin-top: 12px; height: 6px; background: var(--bg-deep);
    border-radius: 3px; overflow: hidden;
}
.progress-fill {
    height: 100%; background: linear-gradient(90deg, var(--accent), var(--gold));
    transition: width 0.4s ease;
}
.status-detail h3 { display: flex; align-items: baseline; gap: 12px; }

/* ============ SCHEDULE ============ */
.schedule-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px; flex-wrap: wrap; gap: 16px;
}
.schedule-header h2 { margin-bottom: 0; }
.schedule-summary {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px; padding: 20px; background: var(--surface);
    border: 1px solid var(--border); border-radius: var(--radius);
    margin-bottom: 28px;
}
.schedule-summary > div { }
.schedule-summary .label {
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--muted); margin-bottom: 4px;
}
.schedule-summary .val {
    font-family: var(--font-mono); font-size: 1.05rem; font-weight: 600;
    color: var(--ink);
}
.schedule-wrap {
    border: 1px solid var(--border); border-radius: var(--radius);
    overflow: auto; max-height: 70vh; background: var(--surface);
}
table.schedule {
    width: 100%; border-collapse: collapse;
    font-family: var(--font-mono); font-size: 0.86rem;
}
table.schedule thead {
    position: sticky; top: 0; background: var(--ink); color: var(--surface);
    z-index: 1;
}
table.schedule th {
    padding: 12px 16px; font-weight: 500; text-align: left;
    font-family: var(--font-body); font-size: 0.78rem;
    letter-spacing: 0.1em; text-transform: uppercase;
}
table.schedule th.num, table.schedule td.num { text-align: right; }
table.schedule tbody tr { border-bottom: 1px solid var(--border); }
table.schedule tbody tr:hover { background: var(--bg-deep); }
table.schedule td { padding: 10px 16px; color: var(--ink-soft); }
table.schedule td:first-child { color: var(--muted); }
table.schedule tr.year-marker td {
    background: var(--surface-2); font-weight: 600; color: var(--accent);
    border-top: 2px solid var(--accent-soft);
}

/* ============ LPR ============ */
.lede {
    max-width: 720px; color: var(--muted); margin-bottom: 32px;
    font-size: 1rem;
}
.lpr-grid {
    border: 1px solid var(--border); border-radius: var(--radius);
    overflow: auto; max-height: 70vh; background: var(--surface);
}
table.lpr-table {
    width: 100%; border-collapse: collapse;
    font-family: var(--font-mono); font-size: 0.88rem;
}
table.lpr-table thead {
    position: sticky; top: 0; background: var(--ink); color: var(--surface);
}
table.lpr-table th {
    padding: 12px 18px; font-weight: 500; text-align: left;
    font-family: var(--font-body); font-size: 0.78rem;
    letter-spacing: 0.1em; text-transform: uppercase;
}
table.lpr-table th.num, table.lpr-table td.num { text-align: right; }
table.lpr-table tbody tr { border-bottom: 1px solid var(--border); }
table.lpr-table tbody tr:hover { background: var(--bg-deep); }
table.lpr-table td { padding: 10px 18px; color: var(--ink-soft); }
table.lpr-table tr.rate-change td.num.changed { color: var(--accent); font-weight: 600; }

/* ============ FOOTER ============ */
footer {
    border-top: 1px solid var(--border); padding: 32px 0 48px;
    background: var(--surface);
    margin-top: 80px;
}
footer p {
    text-align: center; color: var(--muted); font-size: 0.85rem;
    line-height: 1.6;
}
footer p.small { font-size: 0.78rem; margin-top: 6px; color: var(--muted-2); }

/* ============ RESPONSIVE ============ */
@media (max-width: 640px) {
    .container { padding: 0 20px; }
    .masthead { padding: 36px 0 24px; }
    .masthead .container { gap: 24px; }
    .meta-block { width: 100%; }
    .tab { padding: 14px 14px; font-size: 0.85rem; }
    h2 { font-size: 1.5rem; }
    .result-value, .status-value { font-size: 1.2rem; }
    .layout { gap: 28px; }
    table.schedule th, table.schedule td { padding: 8px 10px; }
    table.schedule { font-size: 0.78rem; }
}

/* ============ UTILITY ============ */
.positive { color: var(--positive); }
.negative { color: var(--negative); }
.num { font-family: var(--font-mono); }