/* ==========================================================================
   期货套期保值比率与基差计算器 · 风控终端风
   冷灰网格底 + 墨绿/琥珀强调 + 行情牌 + 终端结果面板
   ========================================================================== */

.fh-page {
    --fh-bg: #eef2f6;
    --fh-panel: #ffffff;
    --fh-panel-2: #f5f8fb;
    --fh-ink: #0f1b26;
    --fh-ink-2: #425463;
    --fh-mut: #7b8b9a;
    --fh-line: #dfe7ef;
    --fh-line-2: #c7d5e2;
    --fh-teal: #0f766e;
    --fh-teal-2: #0b5f59;
    --fh-teal-soft: rgba(15, 118, 110, .1);
    --fh-amber: #b45309;
    --fh-amber-soft: rgba(180, 83, 9, .1);
    --fh-red: #c0392b;
    --fh-green: #12795a;
    --fh-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --fh-mono: ui-monospace, "SFMono-Regular", "Consolas", "Roboto Mono", monospace;
    --fh-shadow: 0 12px 30px -24px rgba(15, 27, 38, .5);

    background: var(--fh-bg);
    color: var(--fh-ink);
    font-family: var(--fh-sans);
    line-height: 1.7;
    padding-bottom: 56px;
}

:root[data-theme="dark"] .fh-page {
    --fh-bg: #090e14;
    --fh-panel: #0f171f;
    --fh-panel-2: #131e28;
    --fh-ink: #e6eef7;
    --fh-ink-2: #a7bacb;
    --fh-mut: #7c8fa1;
    --fh-line: #1b2733;
    --fh-line-2: #293848;
    --fh-teal: #3ddbb8;
    --fh-teal-2: #6ce8ca;
    --fh-teal-soft: rgba(61, 219, 184, .12);
    --fh-amber: #f0b44c;
    --fh-amber-soft: rgba(240, 180, 76, .12);
    --fh-red: #ef8a80;
    --fh-green: #56c79b;
    --fh-shadow: 0 12px 30px -24px rgba(0, 0, 0, .9);
}

.fh-page * { box-sizing: border-box; }

.fh-wrap {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Hero ---------- */
.fh-hero {
    position: relative;
    padding: 22px 0 34px;
    border-bottom: 1px solid var(--fh-line-2);
    background:
        linear-gradient(90deg, var(--fh-teal-soft), transparent 30%),
        repeating-linear-gradient(0deg, transparent 0 31px, rgba(15, 27, 38, .045) 31px 32px),
        repeating-linear-gradient(90deg, transparent 0 31px, rgba(15, 27, 38, .045) 31px 32px),
        linear-gradient(180deg, var(--fh-panel-2), var(--fh-bg));
}
:root[data-theme="dark"] .fh-hero {
    background:
        linear-gradient(90deg, var(--fh-teal-soft), transparent 30%),
        repeating-linear-gradient(0deg, transparent 0 31px, rgba(230, 238, 247, .035) 31px 32px),
        repeating-linear-gradient(90deg, transparent 0 31px, rgba(230, 238, 247, .035) 31px 32px),
        linear-gradient(180deg, #0d1620, var(--fh-bg));
}

.fh-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.fh-crumb { font-size: 12.5px; color: var(--fh-mut); }
.fh-crumb a { color: var(--fh-ink-2); text-decoration: none; }
.fh-crumb a:hover { color: var(--fh-teal); text-decoration: underline; text-underline-offset: 3px; }
.fh-crumb span { margin: 0 7px; color: var(--fh-line-2); }
.fh-crumb b { color: var(--fh-ink); font-weight: 600; }

.fh-theme {
    display: inline-flex;
    gap: 2px;
    padding: 3px;
    border: 1px solid var(--fh-line-2);
    border-radius: 6px;
    background: color-mix(in srgb, var(--fh-panel) 80%, transparent);
}
.fh-theme button {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--fh-mut);
    font-family: var(--fh-sans);
    font-size: 11.5px;
    font-weight: 600;
    padding: 5px 11px;
    border-radius: 4px;
    cursor: pointer;
    transition: background .18s, color .18s;
}
.fh-theme button:hover { color: var(--fh-ink); background: var(--fh-teal-soft); }
.fh-theme button[aria-pressed="true"] {
    background: var(--fh-ink);
    color: var(--fh-panel);
}
.fh-theme button:focus-visible { outline: 2px solid var(--fh-teal); outline-offset: 2px; }

.fh-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .82fr);
    gap: 30px;
    align-items: start;
    margin-top: 26px;
}

.fh-kicker {
    margin: 0 0 9px;
    font-family: var(--fh-mono);
    font-size: 11.5px;
    letter-spacing: .2em;
    color: var(--fh-teal);
}

.fh-h1 {
    margin: 0;
    font-size: 41px;
    line-height: 1.25;
    letter-spacing: -.02em;
    font-weight: 800;
    color: var(--fh-ink);
}

.fh-lede {
    margin: 13px 0 0;
    max-width: 40em;
    font-size: 15px;
    line-height: 1.85;
    color: var(--fh-ink-2);
}
.fh-lede strong {
    color: var(--fh-teal-2);
    font-weight: 700;
    background: linear-gradient(180deg, transparent 64%, var(--fh-teal-soft) 64%);
    padding: 0 1px;
}

.fh-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 0;
    padding: 0;
    list-style: none;
}
.fh-chips li {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 128px;
    padding: 8px 13px;
    border: 1px solid var(--fh-line-2);
    border-top: 2px solid var(--fh-teal);
    border-radius: 3px;
    background: color-mix(in srgb, var(--fh-panel) 88%, transparent);
}
.fh-chips span { font-size: 11.5px; color: var(--fh-mut); }
.fh-chips b {
    font-family: var(--fh-mono);
    font-size: 17px;
    font-weight: 700;
    color: var(--fh-ink);
    font-variant-numeric: tabular-nums;
}

/* 基差行情牌 */
.fh-basis-board {
    border-radius: 6px;
    padding: 0 0 14px;
    background: linear-gradient(160deg, #131e28, #0c141c 70%);
    border: 1px solid #24333f;
    box-shadow: 0 18px 36px -30px rgba(0, 0, 0, .85);
    color: #dfe9f2;
    overflow: hidden;
}
.fh-board-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 14px;
    border-bottom: 1px solid #24333f;
    background: #101a22;
    font-size: 11.5px;
    letter-spacing: .12em;
    color: #8fa3b5;
}
.fh-board-head em {
    font-style: normal;
    font-family: var(--fh-mono);
    font-size: 11px;
    font-weight: 700;
    padding: 1px 7px;
    border-radius: 2px;
    border: 1px solid currentColor;
    color: #7fd8c0;
}
.fh-board-head em.is-discount { color: #f0b44c; }
.fh-board-mid { padding: 14px 14px 10px; }
.fh-board-label { margin: 0 0 2px; font-size: 11.5px; color: #8fa3b5; }
.fh-board-mid b {
    display: block;
    font-family: var(--fh-mono);
    font-size: 31px;
    font-weight: 800;
    letter-spacing: -.02em;
    color: #7fd8c0;
    line-height: 1.2;
}
.fh-board-mid b.is-neg { color: #f0a08a; }
.fh-board-mid span {
    font-family: var(--fh-mono);
    font-size: 12px;
    color: #8fa3b5;
}
.fh-board-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    margin-top: 8px;
    background: #1b2833;
}
.fh-board-grid div {
    padding: 8px 14px;
    background: #0d161e;
    display: flex;
    flex-direction: column;
}
.fh-board-grid span { font-size: 10.5px; color: #7f93a5; }
.fh-board-grid b {
    font-family: var(--fh-mono);
    font-size: 14px;
    font-weight: 700;
    color: #dfe9f2;
    font-variant-numeric: tabular-nums;
}

/* ---------- 主体 ---------- */
.fh-body { padding-top: 24px; }

.fh-work {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .95fr);
    gap: 20px;
    align-items: start;
}

.fh-form {
    border: 1px solid var(--fh-line-2);
    border-radius: 6px;
    background: var(--fh-panel);
    box-shadow: var(--fh-shadow);
    overflow: hidden;
}
.fh-form-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    padding: 11px 16px;
    border-bottom: 1px solid var(--fh-line);
    background: linear-gradient(180deg, var(--fh-panel-2), transparent);
}
.fh-form-head h2 {
    margin: 0;
    font-size: 14.5px;
    font-weight: 800;
    letter-spacing: .03em;
    padding-left: 9px;
    border-left: 3px solid var(--fh-teal);
}
.fh-form-head span { font-size: 11.5px; color: var(--fh-mut); }

.fh-group {
    margin: 0;
    padding: 12px 16px 15px;
    border: 0;
    border-bottom: 1px dashed var(--fh-line);
}
.fh-group:last-of-type { border-bottom: 0; }
.fh-group legend {
    padding: 0 0 8px;
    font-family: var(--fh-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .14em;
    color: var(--fh-teal);
}

.fh-fields {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 11px 14px;
}
.fh-f {
    display: flex;
    flex-direction: column;
    gap: 5px;
    min-width: 0;
}
.fh-f > span:first-child {
    font-size: 12px;
    color: var(--fh-ink-2);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.fh-input {
    display: flex;
    align-items: baseline;
    gap: 5px;
    padding: 6px 9px;
    border: 1px solid var(--fh-line-2);
    border-radius: 4px;
    background: var(--fh-panel-2);
    transition: border-color .18s, box-shadow .18s, background .18s;
}
.fh-input:focus-within {
    border-color: var(--fh-teal);
    background: var(--fh-panel);
    box-shadow: 0 0 0 3px var(--fh-teal-soft);
}
.fh-input input {
    width: 100%;
    min-width: 0;
    border: 0;
    background: transparent;
    color: var(--fh-ink);
    font-family: var(--fh-mono);
    font-size: 15.5px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    text-align: right;
    outline: none;
    padding: 0;
}
.fh-input input::-webkit-outer-spin-button,
.fh-input input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.fh-input input[type="number"] { -moz-appearance: textfield; }
.fh-input em {
    flex: none;
    font-style: normal;
    font-size: 11px;
    color: var(--fh-mut);
    white-space: nowrap;
}
.fh-f select {
    width: 100%;
    padding: 8px 9px;
    border: 1px solid var(--fh-line-2);
    border-radius: 4px;
    background: var(--fh-panel-2);
    color: var(--fh-ink);
    font-family: var(--fh-sans);
    font-size: 12.5px;
    outline: none;
}
.fh-f select:focus { border-color: var(--fh-teal); box-shadow: 0 0 0 3px var(--fh-teal-soft); }

.fh-err {
    margin: 0;
    padding: 9px 16px;
    border-top: 1px solid color-mix(in srgb, var(--fh-red) 28%, transparent);
    background: color-mix(in srgb, var(--fh-red) 8%, transparent);
    color: var(--fh-red);
    font-size: 12.5px;
    font-weight: 600;
}
.fh-err[hidden] { display: none; }

.fh-samples {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 11px 16px;
    border-top: 1px dashed var(--fh-line-2);
    background: var(--fh-panel-2);
}
.fh-samples > span { font-family: var(--fh-mono); font-size: 11px; color: var(--fh-mut); letter-spacing: .1em; }
.fh-samples button {
    appearance: none;
    cursor: pointer;
    padding: 5px 11px;
    border: 1px solid var(--fh-line-2);
    border-radius: 3px;
    background: var(--fh-panel);
    color: var(--fh-ink-2);
    font-family: var(--fh-sans);
    font-size: 12px;
    transition: border-color .16s, background .16s, color .16s;
}
.fh-samples button:hover {
    border-color: var(--fh-teal);
    background: var(--fh-teal-soft);
    color: var(--fh-teal-2);
}
.fh-samples button:focus-visible { outline: 2px solid var(--fh-teal); outline-offset: 2px; }

/* 终端结果面板 */
.fh-result {
    position: sticky;
    top: 82px;
    border: 1px solid var(--fh-line-2);
    border-radius: 6px;
    background: var(--fh-panel);
    box-shadow: var(--fh-shadow);
    overflow: hidden;
}
.fh-result::before {
    content: "";
    display: block;
    height: 26px;
    background:
        radial-gradient(circle at 14px 13px, var(--fh-red) 2.6px, transparent 3px),
        radial-gradient(circle at 28px 13px, var(--fh-amber) 2.6px, transparent 3px),
        radial-gradient(circle at 42px 13px, var(--fh-green) 2.6px, transparent 3px),
        var(--fh-panel-2);
    border-bottom: 1px solid var(--fh-line);
}
.fh-result-top {
    padding: 14px 16px 12px;
    border-bottom: 1px solid var(--fh-line);
    background: linear-gradient(180deg, var(--fh-teal-soft), transparent);
}
.fh-result-top span { display: block; font-size: 11.5px; color: var(--fh-mut); letter-spacing: .08em; }
.fh-result-top b {
    display: block;
    font-family: var(--fh-mono);
    font-size: 36px;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -.03em;
    color: var(--fh-teal);
    font-variant-numeric: tabular-nums;
}
.fh-result-top b.is-zero { color: var(--fh-mut); }
.fh-result-top em {
    display: inline-block;
    margin-top: 2px;
    font-style: normal;
    font-family: var(--fh-mono);
    font-size: 11.5px;
    color: var(--fh-ink-2);
}

.fh-result-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--fh-line);
}
.fh-result-grid div {
    padding: 9px 16px;
    background: var(--fh-panel);
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}
.fh-result-grid span { font-size: 11px; color: var(--fh-mut); }
.fh-result-grid b {
    font-family: var(--fh-mono);
    font-size: 14.5px;
    font-weight: 700;
    color: var(--fh-ink);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.fh-result-grid b.is-neg { color: var(--fh-red); }
.fh-result-grid b.is-pos { color: var(--fh-green); }

.fh-verdict {
    margin: 0;
    padding: 11px 16px;
    border-top: 1px solid var(--fh-line);
    font-size: 12.5px;
    line-height: 1.75;
    color: var(--fh-ink-2);
    border-left: 3px solid var(--fh-teal);
}
.fh-verdict.is-warn { border-left-color: var(--fh-amber); color: var(--fh-amber); }
.fh-result-note {
    margin: 0;
    padding: 9px 16px 12px;
    font-size: 10.5px;
    color: var(--fh-mut);
    border-top: 1px dashed var(--fh-line);
}

/* ---------- 面板 ---------- */
.fh-panel {
    margin-top: 20px;
    border: 1px solid var(--fh-line-2);
    border-radius: 6px;
    background: var(--fh-panel);
    box-shadow: var(--fh-shadow);
    overflow: hidden;
}
.fh-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--fh-line);
    background: linear-gradient(180deg, var(--fh-panel-2), transparent);
}
.fh-panel-head h2 {
    margin: 0;
    font-size: 14px;
    font-weight: 800;
    letter-spacing: .03em;
    padding-left: 9px;
    border-left: 3px solid var(--fh-teal);
}
.fh-panel-head > span,
.fh-panel-meta { font-size: 11.5px; color: var(--fh-mut); }
.fh-panel-meta { display: inline-flex; align-items: center; gap: 6px; }
.fh-swipe { font-style: normal; font-weight: 700; color: var(--fh-teal); }
.fh-swipe[hidden] { display: none; }

/* ---------- 图表 ---------- */
.fh-chart { padding: 10px 12px 0; }
.fh-chart svg { display: block; width: 100%; height: auto; }
.fh-chart .cv-grid { stroke: var(--fh-line); stroke-width: 1; }
.fh-chart .cv-axis { stroke: var(--fh-line-2); stroke-width: 1; }
.fh-chart .cv-un { stroke: var(--fh-amber); stroke-width: 2; fill: none; }
.fh-chart .cv-hg { stroke: var(--fh-teal); stroke-width: 2.4; fill: none; }
.fh-chart .cv-area { fill: var(--fh-teal-soft); }
.fh-chart .cv-txt { fill: var(--fh-mut); font-size: 10px; font-family: var(--fh-mono); }
.fh-chart .cv-flag {
    font-size: 10.5px;
    font-family: var(--fh-sans);
    font-weight: 700;
    /* 描边同底色，文字压在折线上也能看清 */
    paint-order: stroke;
    stroke: var(--fh-panel);
    stroke-width: 3px;
    stroke-linejoin: round;
}
.fh-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding: 6px 16px 0;
    font-size: 11.5px;
    color: var(--fh-ink-2);
}
.fh-legend span { display: inline-flex; align-items: center; gap: 6px; }
.fh-legend span::before {
    content: "";
    width: 16px;
    height: 3px;
    border-radius: 2px;
    background: currentColor;
}
.fh-legend .lg-unhedged { color: var(--fh-amber); }
.fh-legend .lg-hedged { color: var(--fh-teal); }
.fh-chart-note {
    margin: 4px 0 0;
    padding: 8px 16px 12px;
    border-top: 1px dashed var(--fh-line);
    font-size: 11.5px;
    color: var(--fh-mut);
}

/* ---------- 表格 ---------- */
.fh-tablewrap {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.fh-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.fh-table th,
.fh-table td {
    padding: 8px 14px;
    text-align: right;
    white-space: nowrap;
    border-bottom: 1px solid var(--fh-line);
    font-family: var(--fh-mono);
    font-variant-numeric: tabular-nums;
    color: var(--fh-ink-2);
}
.fh-table th {
    position: sticky;
    top: 0;
    z-index: 1;
    font-family: var(--fh-sans);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .04em;
    color: var(--fh-mut);
    background: var(--fh-panel-2);
}
.fh-table th:first-child,
.fh-table td:first-child { text-align: left; }
.fh-table th:last-child,
.fh-table td:last-child { text-align: left; font-family: var(--fh-sans); }
.fh-table tbody tr:last-child td { border-bottom: 0; }
.fh-table tbody tr:hover { background: var(--fh-teal-soft); }
.fh-table tbody tr.is-base { background: color-mix(in srgb, var(--fh-teal) 8%, transparent); }
.fh-table tbody tr.is-base td { color: var(--fh-ink); font-weight: 700; }
.fh-table td.is-neg { color: var(--fh-red); }
.fh-table td.is-pos { color: var(--fh-green); }
.fh-empty { text-align: center !important; font-family: var(--fh-sans) !important; color: var(--fh-mut); }

/* ---------- 说明 + FAQ ---------- */
.fh-note-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px 26px;
    padding: 15px 16px 6px;
}
.fh-note-grid > div {
    padding: 10px 0 12px;
    border-top: 1px solid var(--fh-line);
}
.fh-note-grid h3 {
    margin: 0 0 5px;
    font-size: 13.5px;
    font-weight: 800;
    color: var(--fh-ink);
}
.fh-note-grid p {
    margin: 0;
    font-size: 13px;
    line-height: 1.85;
    color: var(--fh-ink-2);
}

.fh-faq { padding: 4px 16px 10px; }
.fh-faq details { border-top: 1px solid var(--fh-line); }
.fh-faq summary {
    position: relative;
    cursor: pointer;
    padding: 11px 26px 11px 0;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--fh-ink);
    list-style: none;
}
.fh-faq summary::-webkit-details-marker { display: none; }
.fh-faq summary::after {
    content: "+";
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--fh-mono);
    font-size: 16px;
    color: var(--fh-teal);
    transition: transform .2s;
}
.fh-faq details[open] summary::after { content: "−"; }
.fh-faq details > div {
    padding: 0 0 13px;
    font-size: 13px;
    line-height: 1.9;
    color: var(--fh-ink-2);
}

.fh-disclaimer {
    margin: 0;
    padding: 11px 16px;
    border-top: 1px dashed var(--fh-line-2);
    background: var(--fh-panel-2);
    font-size: 11.5px;
    line-height: 1.8;
    color: var(--fh-mut);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
    .fh-hero-grid { grid-template-columns: minmax(0, 1fr); gap: 20px; }
    .fh-basis-board { max-width: 380px; }
    .fh-work { grid-template-columns: minmax(0, 1fr); }
    .fh-result { position: static; }
    .fh-h1 { font-size: 35px; }
}

@media (max-width: 820px) {
    .fh-h1 { font-size: 30px; }
    .fh-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .fh-note-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
    .fh-wrap { padding: 0 15px; }
    .fh-hero { padding: 16px 0 26px; }
    .fh-h1 { font-size: 25px; line-height: 1.3; }
    .fh-lede { font-size: 13.5px; }
    .fh-chips li { flex: 1 1 auto; min-width: 100px; padding: 7px 10px; }
    .fh-chips b { font-size: 14.5px; }
    .fh-result-top b { font-size: 30px; }
    .fh-panel-head { flex-wrap: wrap; row-gap: 3px; }
    .fh-panel-head h2 { white-space: nowrap; }
    .fh-panel-head > span:not(.fh-panel-meta) { display: none; }
    .fh-panel-meta > span { display: none; }
    .fh-panel-meta { margin-left: auto; }
    .fh-table th, .fh-table td { padding: 7px 10px; }
    .fh-basis-board { max-width: none; }
}

@media (max-width: 420px) {
    .fh-h1 { font-size: 23px; }
    .fh-fields { gap: 9px 10px; }
    .fh-input input { font-size: 14.5px; }
    .fh-board-mid b { font-size: 27px; }
}

@media (prefers-reduced-motion: reduce) {
    .fh-page * { transition: none !important; }
}