/* ======================================================================
 *  belt-size-calculator.css —— 皮带尺码选择计算（#9）
 *  主题：深棕 + 驼色 + 酒红（皮具工坊质感）
 *  布局语言：横向皮带刻度带 + 扣位标记（区别于 #6 环形 / #7 仪表盘 / #8 剖面图）
 * ====================================================================== */

/* ---------- 作用域 ---------- */
.blt-page,
.blt-modal,
.blt-sheet,
.blt-toast {
    --blt-espresso: #33241A;
    --blt-espresso-2: #4A3527;
    --blt-camel: #C08B4F;
    --blt-camel-2: #D9A96E;
    --blt-camel-soft: #F6EDE0;
    --blt-wine: #7B2D26;
    --blt-wine-soft: #F6E7E4;
    --blt-paper: #F5EFE7;
    --blt-card: #FFFFFF;
    --blt-card-2: #FAF6F0;
    --blt-line: #E0D5C5;
    --blt-line-2: #EDE4D6;
    --blt-ink: #2A1E15;
    --blt-ink-2: #5B4A3C;
    --blt-ink-3: #8E7C6C;
    --blt-ok: #3F7A43;
    --blt-ok-soft: #E9F3E8;
    --blt-warn: #A56A10;
    --blt-warn-soft: #FBF0DC;
    --blt-danger: #A53228;
    --blt-danger-soft: #F9E8E5;
    --blt-r-sm: 8px;
    --blt-r-md: 13px;
    --blt-r-lg: 17px;
    --blt-sh-1: 0 1px 2px rgba(42, 30, 21, .07);
    --blt-sh-2: 0 9px 24px rgba(42, 30, 21, .1);
    --blt-sh-3: 0 20px 46px rgba(42, 30, 21, .17);
    --blt-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

:root[data-theme="dark"] .blt-page,
:root[data-theme="dark"] .blt-modal,
:root[data-theme="dark"] .blt-sheet,
:root[data-theme="dark"] .blt-toast {
    --blt-espresso: #17110C;
    --blt-espresso-2: #221913;
    --blt-camel: #D6A163;
    --blt-camel-2: #E8BE86;
    --blt-camel-soft: rgba(214, 161, 99, .14);
    --blt-wine: #D4736A;
    --blt-wine-soft: rgba(212, 115, 106, .14);
    --blt-paper: #12100D;
    --blt-card: #1B1610;
    --blt-card-2: #221C15;
    --blt-line: #362C22;
    --blt-line-2: #2A221A;
    --blt-ink: #F1E9DE;
    --blt-ink-2: #C6B7A4;
    --blt-ink-3: #96856F;
    --blt-ok: #7FC272;
    --blt-ok-soft: rgba(127, 194, 114, .14);
    --blt-warn: #E3B360;
    --blt-warn-soft: rgba(227, 179, 96, .14);
    --blt-danger: #E28A7F;
    --blt-danger-soft: rgba(226, 138, 127, .14);
    --blt-sh-1: 0 1px 2px rgba(0, 0, 0, .42);
    --blt-sh-2: 0 9px 24px rgba(0, 0, 0, .48);
    --blt-sh-3: 0 20px 46px rgba(0, 0, 0, .58);
}

.blt-page {
    color: var(--blt-ink);
    font-size: 15.5px;
    line-height: 1.8;
}
.blt-page * { box-sizing: border-box; }

/* ================= 首屏 ================= */
.blt-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 32px;
    align-items: center;
    background:
        radial-gradient(520px 260px at 88% 10%, rgba(192, 139, 79, .22), transparent 62%),
        linear-gradient(140deg, var(--blt-espresso) 0%, var(--blt-espresso-2) 100%);
    border-radius: var(--blt-r-lg);
    padding: 32px 36px;
    margin-bottom: 22px;
    box-shadow: var(--blt-sh-3);
    position: relative;
    overflow: hidden;
}
.blt-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: repeating-linear-gradient(115deg, rgba(255, 255, 255, .035) 0 2px, transparent 2px 9px);
    pointer-events: none;
}
.blt-hero-copy { position: relative; z-index: 1; min-width: 0; }
.blt-kicker {
    display: inline-block;
    padding: 5px 13px;
    border-radius: 999px;
    background: rgba(192, 139, 79, .18);
    border: 1px solid rgba(192, 139, 79, .42);
    color: var(--blt-camel-2);
    font-size: 12.5px;
    font-weight: 700;
    margin-bottom: 13px;
}
.blt-hero h1 {
    font-size: clamp(25px, 3.2vw, 34px);
    font-weight: 800;
    line-height: 1.26;
    letter-spacing: -.02em;
    color: #FFF8EE;
    margin: 0 0 11px;
}
.blt-hero-sub {
    font-size: 15px;
    line-height: 1.86;
    color: #D8C6B2;
    margin: 0 0 16px;
    max-width: 56ch;
}
.blt-hero-sub b { color: var(--blt-camel-2); font-weight: 700; }
.blt-chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.blt-chips li {
    padding: 5px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .13);
    color: #E2D3C1;
    font-size: 12.5px;
    font-weight: 600;
}

/* 皮带刻度带 */
.blt-belt-wrap { position: relative; z-index: 1; }
.blt-belt {
    position: relative;
    width: 100%;
    max-width: 400px;
    height: 132px;
    margin: 0 auto;
}
.blt-belt-strap {
    position: absolute;
    left: 0; right: 0;
    top: 44px;
    height: 46px;
    border-radius: 6px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, .12), rgba(0, 0, 0, .22)),
        var(--blt-camel);
    box-shadow: 0 10px 26px rgba(0, 0, 0, .38), inset 0 0 0 1px rgba(0, 0, 0, .18);
    overflow: hidden;
}
.blt-belt-holes {
    position: absolute;
    left: 10px; top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 13px;
}
.blt-hole {
    width: 9px; height: 9px;
    border-radius: 50%;
    background: rgba(30, 20, 12, .55);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, .5), 0 0 0 1.5px rgba(255, 255, 255, .18);
}
.blt-hole.is-use {
    background: var(--blt-wine);
    box-shadow: 0 0 0 2.5px rgba(255, 255, 255, .85), 0 0 0 4px rgba(123, 45, 38, .55);
}
.blt-belt-buckle {
    position: absolute;
    right: 16px;
    top: 32px;
    width: 58px; height: 70px;
    border: 6px solid #E5D4B8;
    border-radius: 8px;
    background: rgba(0, 0, 0, .22);
    box-shadow: 0 6px 16px rgba(0, 0, 0, .34);
}
.blt-belt-buckle::after {
    content: "";
    position: absolute;
    left: 50%; top: 100%;
    transform: translateX(-50%);
    width: 4px; height: 20px;
    background: #E5D4B8;
    border-radius: 0 0 2px 2px;
}
.blt-belt-scale {
    position: absolute;
    left: 0; right: 0;
    top: 96px;
    height: 30px;
    border-top: 1.5px solid rgba(255, 255, 255, .38);
}
.blt-belt-scale span {
    position: absolute;
    top: 6px;
    transform: translateX(-50%);
    font-size: 11px;
    font-family: var(--blt-mono);
    color: #CDBBA6;
    white-space: nowrap;
}
.blt-belt-scale span::before {
    content: "";
    position: absolute;
    left: 50%; top: -7px;
    width: 1px; height: 6px;
    background: rgba(255, 255, 255, .4);
}
.blt-belt-marker {
    position: absolute;
    top: 28px;
    transform: translateX(-50%);
    text-align: center;
    color: #FFF8EE;
}
.blt-belt-marker i {
    display: block;
    width: 2px; height: 78px;
    margin: 0 auto;
    background: linear-gradient(180deg, var(--blt-wine), rgba(123, 45, 38, .2));
}
.blt-belt-marker b {
    font-size: 12px;
    font-weight: 800;
    background: var(--blt-wine);
    padding: 2px 9px;
    border-radius: 999px;
    white-space: nowrap;
}
.blt-belt-readout { text-align: center; margin-top: 10px; }
.blt-belt-readout b {
    display: block;
    font-size: 33px;
    font-weight: 800;
    color: var(--blt-camel-2);
    letter-spacing: -.02em;
    line-height: 1.16;
}
.blt-belt-readout b small { font-size: 15px; margin-left: 3px; }
.blt-belt-readout span { font-size: 12px; color: #C7B49E; font-weight: 600; }
.blt-belt-note { font-size: 12.5px; color: #D3C1AC; text-align: center; margin: 6px 0 0; }
.blt-belt-note b { color: var(--blt-camel-2); }

/* ================= 首屏操作条 ================= */
.blt-quick {
    background: var(--blt-card);
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-md);
    box-shadow: var(--blt-sh-2);
    padding: 17px 21px 15px;
    margin: -10px 0 22px;
    position: relative;
    z-index: 3;
}
.blt-quick-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) auto;
    gap: 16px;
    align-items: end;
}
.blt-field { min-width: 0; }
.blt-field > label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--blt-ink-2);
    margin-bottom: 6px;
}
.blt-field input[type="text"],
.blt-field input[type="number"],
.blt-field select {
    width: 100%;
    padding: 10px 12px;
    font-size: 15px;
    font-family: inherit;
    color: var(--blt-ink);
    background: var(--blt-card-2);
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-sm);
    outline: none;
    transition: border-color .16s, box-shadow .16s, background-color .16s;
}
.blt-field input:focus, .blt-field select:focus {
    border-color: var(--blt-camel);
    background: var(--blt-card);
    box-shadow: 0 0 0 3px var(--blt-camel-soft);
}
.blt-field input.is-bad { border-color: var(--blt-danger); box-shadow: 0 0 0 3px var(--blt-danger-soft); }
.blt-hint { font-size: 12px; line-height: 1.6; color: var(--blt-ink-3); margin: 5px 0 0; }
.blt-hint b { color: var(--blt-ink-2); }
.blt-err { font-size: 12.5px; color: var(--blt-danger); margin: 9px 0 0; font-weight: 600; }
.blt-err:empty { display: none; }
.blt-quick-mini { display: flex; gap: 14px; justify-content: center; margin-top: 7px; }
.blt-linkbtn {
    background: none; border: none; padding: 0;
    font-family: inherit; font-size: 12.5px; font-weight: 650;
    color: var(--blt-ink-3); cursor: pointer;
    border-bottom: 1px dashed var(--blt-line);
    transition: color .16s, border-color .16s;
}
.blt-linkbtn:hover { color: var(--blt-wine); border-color: var(--blt-wine); }

/* ================= 按钮 ================= */
.blt-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.blt-btn {
    padding: 10px 18px;
    border-radius: var(--blt-r-sm);
    border: 1px solid var(--blt-line);
    background: var(--blt-card);
    color: var(--blt-ink-2);
    font-size: 14px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all .16s;
}
.blt-btn:hover { border-color: var(--blt-camel); color: var(--blt-camel); transform: translateY(-1px); }
.blt-btn--primary {
    background: linear-gradient(135deg, var(--blt-wine), #964038);
    border-color: transparent;
    color: #FFF3EC;
    box-shadow: 0 8px 20px rgba(123, 45, 38, .26);
}
.blt-btn--primary:hover { color: #FFF3EC; filter: brightness(1.06); }
.blt-btn--lg { padding: 12px 28px; font-size: 15px; }

/* ================= 主区 ================= */
.blt-main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 392px);
    gap: 20px;
    align-items: start;
}
.blt-panel {
    background: var(--blt-card);
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-md);
    box-shadow: var(--blt-sh-1);
    padding: 19px 21px 21px;
    margin-bottom: 18px;
}
.blt-panel-head { display: flex; align-items: center; gap: 10px; margin-bottom: 15px; }
.blt-step {
    flex-shrink: 0;
    display: grid; place-items: center;
    width: 27px; height: 27px;
    border-radius: 7px;
    background: var(--blt-espresso);
    color: var(--blt-camel-2);
    font-size: 12px;
    font-weight: 800;
    font-family: var(--blt-mono);
}
.blt-panel-head h2 {
    font-size: 17px; font-weight: 750; color: var(--blt-ink);
    margin: 0; letter-spacing: -.01em;
}

/* 推荐卡 */
.blt-verdict {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 20px;
    align-items: center;
    padding: 21px 23px;
    border-radius: var(--blt-r-md);
    background: linear-gradient(135deg, var(--blt-espresso), var(--blt-espresso-2));
    color: #FFF8EE;
    margin-bottom: 18px;
    box-shadow: var(--blt-sh-2);
}
.blt-verdict-badge {
    display: grid; place-items: center;
    min-width: 96px;
    padding: 13px 16px;
    border-radius: 10px;
    background: var(--blt-camel);
    color: #2A1E15;
    font-size: 25px;
    font-weight: 800;
    line-height: 1.1;
    text-align: center;
}
.blt-verdict-badge small { display: block; font-size: 11px; font-weight: 700; opacity: .8; margin-top: 3px; }
.blt-verdict-main h3 { font-size: 19px; font-weight: 800; margin: 0 0 6px; color: #FFF8EE; letter-spacing: -.01em; }
.blt-verdict-main p { font-size: 14px; line-height: 1.76; color: #D8C6B2; margin: 0; }
.blt-verdict-main p b { color: var(--blt-camel-2); }

/* 明细 */
.blt-rows { display: flex; flex-direction: column; }
.blt-row {
    display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
    padding: 10px 2px;
    border-bottom: 1px dashed var(--blt-line);
    font-size: 14px;
}
.blt-row:last-child { border-bottom: none; }
.blt-row .rk { color: var(--blt-ink-2); flex-shrink: 0; }
.blt-row .rv { color: var(--blt-ink); font-weight: 700; text-align: right; word-break: break-all; }
.blt-row .rv em { font-style: normal; color: var(--blt-ink-3); font-weight: 500; font-size: 12.5px; }

/* 提示 */
.blt-note {
    display: flex; gap: 11px;
    padding: 13px 15px;
    border-radius: var(--blt-r-sm);
    font-size: 13.5px; line-height: 1.75;
    margin-bottom: 11px;
    border: 1px solid transparent;
}
.blt-note:last-child { margin-bottom: 0; }
.blt-note .ico { flex-shrink: 0; font-size: 16px; line-height: 1.5; }
.blt-note--ok { background: var(--blt-ok-soft); border-color: color-mix(in srgb, var(--blt-ok) 26%, transparent); color: var(--blt-ink-2); }
.blt-note--ok b { color: var(--blt-ok); }
.blt-note--warn { background: var(--blt-warn-soft); border-color: color-mix(in srgb, var(--blt-warn) 26%, transparent); color: var(--blt-ink-2); }
.blt-note--warn b { color: var(--blt-warn); }
.blt-note--danger { background: var(--blt-danger-soft); border-color: color-mix(in srgb, var(--blt-danger) 26%, transparent); color: var(--blt-ink-2); }
.blt-note--danger b { color: var(--blt-danger); }

/* 对照表 */
.blt-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.blt-table th, .blt-table td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--blt-line-2); }
.blt-table th { font-size: 12px; font-weight: 700; color: var(--blt-ink-3); background: var(--blt-card-2); white-space: nowrap; }
.blt-table td { color: var(--blt-ink-2); }
.blt-table td:first-child { font-weight: 700; color: var(--blt-ink); white-space: nowrap; }
.blt-table tr.is-hit td { background: var(--blt-camel-soft); color: var(--blt-ink); }
.blt-table tr.is-hit td:first-child { color: var(--blt-wine); }
.blt-table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* 批量 */
.blt-batch textarea {
    width: 100%; min-height: 112px;
    padding: 12px 13px;
    font-size: 14px; font-family: var(--blt-mono); line-height: 1.72;
    color: var(--blt-ink);
    background: var(--blt-card-2);
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-sm);
    outline: none; resize: vertical;
}
.blt-batch textarea:focus { border-color: var(--blt-camel); box-shadow: 0 0 0 3px var(--blt-camel-soft); }
.blt-batch-out {
    margin-top: 12px; max-height: 320px; overflow: auto;
    border: 1px solid var(--blt-line); border-radius: var(--blt-r-sm);
}
.blt-batch-out table { width: 100%; border-collapse: collapse; font-size: 13px; }
.blt-batch-out th, .blt-batch-out td { padding: 7px 10px; border-bottom: 1px solid var(--blt-line-2); text-align: left; }
.blt-batch-out th { background: var(--blt-card-2); color: var(--blt-ink-3); font-size: 12px; font-weight: 700; position: sticky; top: 0; }
.blt-batch-out td { color: var(--blt-ink-2); }
.blt-batch-out td:first-child { font-weight: 700; color: var(--blt-ink); }

/* 全文 */
.blt-doc {
    font-family: var(--blt-mono); font-size: 13px; line-height: 1.85;
    white-space: pre-wrap; word-break: break-word;
    color: var(--blt-ink-2);
    background: var(--blt-card-2);
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-sm);
    padding: 15px 16px;
    max-height: 440px; overflow: auto;
}
.blt-doc:empty::before { content: "输入腰围后点击「开始计算」"; color: var(--blt-ink-3); }

/* 风险卡 */
.blt-risk { margin-top: 28px; }
.blt-risk > h2 { font-size: 20px; font-weight: 800; margin: 0 0 15px; letter-spacing: -.01em; }
.blt-risk-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 13px; }
.blt-risk-card {
    padding: 17px 18px;
    border: 1px solid var(--blt-line);
    border-left: 3px solid var(--blt-camel);
    border-radius: var(--blt-r-sm);
    background: var(--blt-card);
    box-shadow: var(--blt-sh-1);
}
.blt-risk-card h3 { font-size: 15px; font-weight: 750; margin: 0 0 6px; color: var(--blt-ink); }
.blt-risk-card p { font-size: 13.5px; line-height: 1.78; color: var(--blt-ink-2); margin: 0; }
.blt-risk-card b { color: var(--blt-ink); }

/* toast */
.blt-toast {
    position: fixed; left: 50%; bottom: 26px;
    transform: translateX(-50%) translateY(10px);
    background: var(--blt-espresso);
    color: #FFF8EE;
    font-size: 14px; font-weight: 600;
    padding: 11px 22px; border-radius: 999px;
    z-index: 9999; opacity: 0; pointer-events: none;
    transition: opacity .2s, transform .2s;
    box-shadow: var(--blt-sh-3);
}
.blt-toast.is-on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ================= 响应式 ================= */
@media (max-width: 980px) {
    .blt-hero { grid-template-columns: 1fr; padding: 26px 22px; }
    .blt-main { grid-template-columns: 1fr; }
    .blt-quick-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .blt-quick-grid .blt-field--act { grid-column: 1 / -1; }
}
@media (max-width: 600px) {
    .blt-hero { padding: 20px 16px; }
    .blt-hero h1 { font-size: 22px; }
    .blt-quick-grid { grid-template-columns: 1fr; }
    .blt-verdict { grid-template-columns: 1fr; text-align: center; }
    .blt-verdict-badge { justify-self: center; }
    .blt-belt { height: 118px; }
}

/* ================= AI 解读 ================= */
.blt-ai {
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-md);
    background: var(--blt-card);
    padding: 18px 20px 20px;
    box-shadow: var(--blt-sh-1);
    margin-bottom: 18px;
}
.blt-ai-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.blt-ai-head h2 { font-size: 16px; font-weight: 750; margin: 0; color: var(--blt-ink); }
.blt-ai-head .ai-tag {
    font-size: 11.5px;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 999px;
    background: var(--blt-wine-soft);
    color: var(--blt-wine);
    border: 1px solid color-mix(in srgb, var(--blt-wine) 30%, transparent);
}
.blt-ai-btn {
    padding: 9px 18px;
    border-radius: var(--blt-r-sm);
    border: 1px solid var(--blt-wine);
    background: var(--blt-wine-soft);
    color: var(--blt-wine);
    font-size: 13.5px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all .16s;
}
.blt-ai-btn:hover { background: var(--blt-wine); color: #FFF3EC; }
.blt-ai-btn:disabled { opacity: .55; cursor: not-allowed; }
.blt-ai-status { font-size: 12.5px; color: var(--blt-ink-3); }
.blt-ai-box {
    margin-top: 12px;
    font-size: 14px;
    line-height: 1.82;
    color: var(--blt-ink-2);
    background: var(--blt-card-2);
    border: 1px solid var(--blt-line);
    border-radius: var(--blt-r-sm);
    padding: 14px 16px;
}
.blt-ai-box:empty { display: none; }
.blt-ai-box p { margin: 0 0 8px; }
.blt-ai-box p:last-child { margin-bottom: 0; }
.blt-ai-note { font-size: 12px; color: var(--blt-ink-3); margin: 10px 0 0; }

/* ================= 打印 ================= */
@media print {
    .blt-actions, .blt-batch, .blt-toast, .blt-quick, .blt-ai { display: none !important; }
    .blt-hero { background: none; box-shadow: none; border: 1px solid #999; }
    .blt-hero h1, .blt-hero-sub, .blt-kicker, .blt-chips li { color: #000 !important; }
    .blt-panel, .blt-risk-card { box-shadow: none; break-inside: avoid; }
}