/* ==========================================================================
   专利申请官费与年费成本计算器 /tool/patent-fee-calc
   视觉主题：「专利审查档案室」卷宗米黄 + 公文藏青 + 朱砂印章红 + 蜡封铜金
   ========================================================================== */
:root {
    --pfc-paper: #f6f1e4;
    --pfc-panel: #fffdf6;
    --pfc-panel2: #f1ead8;
    --pfc-ink: #1e3350;
    --pfc-ink-soft: #51617a;
    --pfc-line: #e0d6bd;
    --pfc-seal: #b23427;
    --pfc-seal-soft: #f6e3df;
    --pfc-brass: #a8843c;
    --pfc-brass-soft: #f0e6cc;
    --pfc-good: #2e7d4f;
    --pfc-warn: #b23427;
    --pfc-num: 'SFMono-Regular', Consolas, 'Courier New', monospace;
    --pfc-shadow: 0 10px 28px rgba(70, 55, 20, .10);
}
:root[data-theme="dark"] {
    --pfc-paper: #131a24;
    --pfc-panel: #1a2330;
    --pfc-panel2: #212c3c;
    --pfc-ink: #e7e1cf;
    --pfc-ink-soft: #a3aebe;
    --pfc-line: #33405285;
    --pfc-seal: #e0604f;
    --pfc-seal-soft: #3a2622;
    --pfc-brass: #cfa754;
    --pfc-brass-soft: #33301f;
    --pfc-good: #63b98a;
    --pfc-warn: #e0604f;
    --pfc-shadow: 0 10px 28px rgba(0, 0, 0, .45);
}

.pfc-page {
    max-width: 1180px;
    margin: 0 auto;
    font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--pfc-ink);
    line-height: 1.7;
    letter-spacing: .01em;
}
.pfc-page h1, .pfc-page h2 { font-style: normal; }
.pfc-page b { color: var(--pfc-seal); font-weight: 700; }

/* ===================== 首屏 Hero ===================== */
.pfc-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(300px, .9fr);
    gap: 26px;
    align-items: stretch;
    background:
        radial-gradient(620px 300px at 88% -10%, var(--pfc-brass-soft) 0%, transparent 62%),
        linear-gradient(180deg, var(--pfc-panel) 0%, var(--pfc-paper) 100%);
    border: 1px solid var(--pfc-line);
    border-radius: 20px;
    padding: 34px 34px 30px;
    box-shadow: var(--pfc-shadow);
    margin-bottom: 22px;
}
.pfc-kicker {
    display: inline-block;
    font-size: 12px;
    letter-spacing: .35em;
    color: var(--pfc-brass);
    border: 1px solid var(--pfc-brass);
    border-radius: 999px;
    padding: 3px 14px 2px 18px;
    margin-bottom: 14px;
}
.pfc-hero-copy h1 {
    font-family: 'Songti SC', 'STSong', 'SimSun', Georgia, serif;
    font-size: clamp(26px, 3.4vw, 38px);
    line-height: 1.25;
    margin: 0 0 12px;
    letter-spacing: .02em;
}
.pfc-lead { font-size: 15.5px; color: var(--pfc-ink-soft); margin: 0 0 16px; max-width: 640px; }
.pfc-lead b { color: var(--pfc-ink); }
.pfc-tags {
    display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0 0 20px; list-style: none;
}
.pfc-tags li {
    font-size: 12.5px;
    background: var(--pfc-panel2);
    border: 1px solid var(--pfc-line);
    border-radius: 6px;
    padding: 3px 10px;
    color: var(--pfc-ink-soft);
}

/* 快捷入口 */
.pfc-quick {
    background: var(--pfc-panel);
    border: 1px dashed var(--pfc-brass);
    border-radius: 14px;
    padding: 14px 16px;
}
.pfc-quick-title { font-size: 13.5px; font-weight: 700; color: var(--pfc-brass); margin-bottom: 10px; }
.pfc-quick-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.pfc-quick-field { display: flex; flex-direction: column; gap: 4px; }
.pfc-quick-field span { font-size: 12px; color: var(--pfc-ink-soft); }
.pfc-quick-field input,
.pfc-quick-field select {
    min-width: 130px;
    padding: 9px 12px;
    border: 1px solid var(--pfc-line);
    border-radius: 8px;
    background: var(--pfc-paper);
    color: var(--pfc-ink);
    font-size: 14px;
    font-family: var(--pfc-num);
}
.pfc-quick-field input:focus, .pfc-quick-field select:focus {
    outline: none; border-color: var(--pfc-brass);
    box-shadow: 0 0 0 3px rgba(168, 132, 60, .18);
}

/* 卷宗证书卡 */
.pfc-dossier { display: flex; }
.pfc-cert {
    flex: 1;
    background: linear-gradient(165deg, var(--pfc-panel) 0%, var(--pfc-brass-soft) 130%);
    border: 1px solid var(--pfc-line);
    border-radius: 14px;
    padding: 18px;
    display: flex; flex-direction: column;
    box-shadow: var(--pfc-shadow);
}
.pfc-cert-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.pfc-cert-no { font-size: 11.5px; color: var(--pfc-ink-soft); letter-spacing: .12em; }
.pfc-cert-no b { color: var(--pfc-brass); font-family: var(--pfc-num); }
.pfc-cert-title {
    font-family: 'Songti SC', 'STSong', 'SimSun', Georgia, serif;
    font-size: 16px; letter-spacing: .18em; color: var(--pfc-ink);
}
.pfc-cert-svg { width: 100%; height: auto; display: block; }
.pfc-cert-paper { fill: var(--pfc-paper); stroke: var(--pfc-line); }
.pfc-cert-inner { fill: none; stroke: var(--pfc-brass); stroke-dasharray: 4 3; }
.pfc-cert-rule { stroke: var(--pfc-line); stroke-width: 2; }
.pfc-cert-rule--w { stroke: var(--pfc-brass); stroke-width: 1; opacity: .55; }
.pfc-stamp { opacity: 0; transform-origin: 196px 106px; transition: opacity .5s ease, transform .5s ease; transform: scale(1.4) rotate(-6deg); }
.pfc-stamp.on { opacity: 1; transform: scale(1) rotate(-8deg); }
.pfc-stamp-ring { fill: none; stroke: var(--pfc-seal); stroke-width: 3; }
.pfc-stamp-ring2 { fill: none; stroke: var(--pfc-seal); stroke-width: 1; }
.pfc-stamp-txt { font-size: 13px; fill: var(--pfc-seal); font-weight: 700; letter-spacing: .1em; }
.pfc-stamp-txt2 { font-size: 7px; fill: var(--pfc-seal); letter-spacing: .2em; }
.pfc-cert-foot { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.pfc-cert-kpi {
    background: var(--pfc-paper);
    border: 1px solid var(--pfc-line);
    border-radius: 10px;
    padding: 8px 12px;
}
.pfc-cert-kpi span { display: block; font-size: 11.5px; color: var(--pfc-ink-soft); }
.pfc-cert-kpi b { font-size: 19px; font-family: var(--pfc-num); color: var(--pfc-ink); }
.pfc-cert-kpi b.pfc-cert-saved { color: var(--pfc-good); }

/* ===================== 面板通用 ===================== */
.pfc-panel {
    background: var(--pfc-panel);
    border: 1px solid var(--pfc-line);
    border-radius: 16px;
    padding: 26px 28px;
    margin-bottom: 20px;
    box-shadow: var(--pfc-shadow);
}
.pfc-panel-head { margin-bottom: 18px; }
.pfc-pk {
    display: inline-block;
    font-size: 12px; letter-spacing: .3em;
    color: var(--pfc-seal);
    border-left: 3px solid var(--pfc-seal);
    padding-left: 10px;
    margin-bottom: 6px;
}
.pfc-panel-head h2 {
    font-family: 'Songti SC', 'STSong', 'SimSun', Georgia, serif;
    font-size: 21px; margin: 0 0 6px; letter-spacing: .03em;
}
.pfc-panel-head > p { margin: 0; font-size: 13.5px; color: var(--pfc-ink-soft); }
.pfc-panel-head > p b { color: var(--pfc-ink); }
.pfc-panel-side { float: right; font-size: 12.5px; color: var(--pfc-ink-soft); }

/* 表单 */
.pfc-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 14px; }
.pfc-field { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.pfc-field > span { font-size: 12.5px; color: var(--pfc-ink-soft); }
.pfc-field input, .pfc-field select {
    padding: 9px 12px;
    border: 1px solid var(--pfc-line);
    border-radius: 8px;
    background: var(--pfc-paper);
    color: var(--pfc-ink);
    font-size: 14px;
    font-family: var(--pfc-num);
    width: 100%;
    box-sizing: border-box;
}
.pfc-field input:focus, .pfc-field select:focus { outline: none; border-color: var(--pfc-brass); box-shadow: 0 0 0 3px rgba(168,132,60,.18); }
.pfc-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.pfc-chips button {
    border: 1px solid var(--pfc-line);
    background: var(--pfc-paper);
    color: var(--pfc-ink-soft);
    border-radius: 999px;
    font-size: 12.5px;
    padding: 5px 12px;
    cursor: pointer;
    transition: all .15s;
}
.pfc-chips button:hover { border-color: var(--pfc-brass); color: var(--pfc-ink); }
.pfc-chips button.on { background: var(--pfc-brass); border-color: var(--pfc-brass); color: #fff; }
:root[data-theme="dark"] .pfc-chips button.on { color: #1a2330; font-weight: 700; }

/* 费减分段 */
.pfc-reduction {
    display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
    background: var(--pfc-seal-soft);
    border: 1px solid var(--pfc-seal);
    border-radius: 12px;
    padding: 12px 16px;
    margin-bottom: 14px;
}
.pfc-reduction-label { font-weight: 700; font-size: 13.5px; color: var(--pfc-seal); }
.pfc-reduction small { flex-basis: 100%; color: var(--pfc-ink-soft); font-size: 12px; }
.pfc-seg { display: inline-flex; background: var(--pfc-panel); border: 1px solid var(--pfc-line); border-radius: 999px; padding: 3px; }
.pfc-seg button {
    border: 0; background: transparent; color: var(--pfc-ink-soft);
    border-radius: 999px; padding: 6px 16px; font-size: 13px; cursor: pointer;
}
.pfc-seg button.on { background: var(--pfc-seal); color: #fff; font-weight: 700; }
:root[data-theme="dark"] .pfc-seg button.on { color: #1a2330; }

/* 按钮 */
.pfc-btn {
    border: 1px solid var(--pfc-line);
    background: var(--pfc-panel2);
    color: var(--pfc-ink);
    border-radius: 9px;
    padding: 9px 18px;
    font-size: 14px;
    cursor: pointer;
    transition: all .15s;
}
.pfc-btn:hover { border-color: var(--pfc-brass); transform: translateY(-1px); }
.pfc-btn--seal {
    background: var(--pfc-seal);
    border-color: var(--pfc-seal);
    color: #fff;
    font-weight: 700;
}
.pfc-btn--seal:hover { filter: brightness(1.08); }
:root[data-theme="dark"] .pfc-btn--seal { color: #1a2330; }

/* 错误提示 */
.pfc-err {
    background: var(--pfc-seal-soft);
    border: 1px solid var(--pfc-seal);
    color: var(--pfc-seal);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 13px;
    margin-top: 8px;
}

/* KPI */
.pfc-kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 20px; }
.pfc-kpi {
    background: linear-gradient(180deg, var(--pfc-paper) 0%, var(--pfc-panel) 100%);
    border: 1px solid var(--pfc-line);
    border-radius: 12px;
    padding: 14px 16px;
}
.pfc-kpi > span { display: block; font-size: 12.5px; color: var(--pfc-ink-soft); margin-bottom: 4px; }
.pfc-kpi b { display: block; font-size: 24px; font-family: var(--pfc-num); color: var(--pfc-ink); line-height: 1.2; }
.pfc-kpi em { font-style: normal; font-size: 11.5px; color: var(--pfc-ink-soft); }
.pfc-kpi--save { border-color: var(--pfc-good); background: linear-gradient(180deg, rgba(46,125,79,.08) 0%, var(--pfc-panel) 100%); }
.pfc-kpi--save b { color: var(--pfc-good); }

/* 子标题 */
.pfc-subhead { display: flex; justify-content: space-between; align-items: baseline; margin: 18px 0 10px; }
.pfc-subhead b { font-size: 14.5px; }
.pfc-subhead span { font-size: 12px; color: var(--pfc-ink-soft); }

/* 表格 */
.pfc-table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.pfc-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 560px; }
.pfc-table th {
    text-align: left; font-size: 12px; letter-spacing: .08em;
    color: var(--pfc-ink-soft); border-bottom: 2px solid var(--pfc-brass);
    padding: 8px 10px; white-space: nowrap;
}
.pfc-table td { border-bottom: 1px dashed var(--pfc-line); padding: 9px 10px; vertical-align: top; }
.pfc-table tr:last-child td { border-bottom: 0; }
.pfc-table td.num, .pfc-table th.num { text-align: right; font-family: var(--pfc-num); white-space: nowrap; }
.pfc-table .pfc-red { color: var(--pfc-good); }
.pfc-table .pfc-std { color: var(--pfc-ink-soft); text-decoration: line-through; text-decoration-color: rgba(178,52,39,.5); margin-right: 6px; }
.pfc-table .pfc-note { font-size: 12px; color: var(--pfc-ink-soft); }
.pfc-table tr.pfc-dim { opacity: .55; }
.pfc-table tfoot td { font-weight: 700; border-top: 2px solid var(--pfc-seal); border-bottom: 0; }
.pfc-annual-hl td { background: rgba(168,132,60,.08); }

/* 批量条 */
.pfc-batch {
    margin-top: 14px;
    background: var(--pfc-brass-soft);
    border: 1px dashed var(--pfc-brass);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 13.5px;
}

/* 滑块 */
.pfc-slider-row { display: block; margin: 4px 0 14px; }
.pfc-slider-row > span { font-size: 13.5px; display: block; margin-bottom: 6px; }
.pfc-slider-row b { color: var(--pfc-seal); font-family: var(--pfc-num); font-size: 16px; }
.pfc-slider-row input[type="range"] { width: 100%; accent-color: var(--pfc-seal); }

/* 成本曲线 */
.pfc-curve { margin-top: 6px; }
#pfcCurveSvg { width: 100%; height: 190px; display: block; }

/* 省法卡片 */
.pfc-plan-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-bottom: 8px; }
.pfc-plan {
    background: var(--pfc-paper);
    border: 1px solid var(--pfc-line);
    border-radius: 12px;
    padding: 14px 16px;
    position: relative;
    overflow: hidden;
}
.pfc-plan::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--pfc-brass);
}
.pfc-plan b.pfc-plan-t { display: block; font-size: 14.5px; margin-bottom: 6px; }
.pfc-plan .pfc-plan-v { font-size: 22px; font-family: var(--pfc-num); color: var(--pfc-seal); }
.pfc-plan .pfc-plan-d { font-size: 12.5px; color: var(--pfc-ink-soft); margin-top: 4px; display: block; }

/* 口径说明 */
.pfc-terms { list-style: none; margin: 0; padding: 0; }
.pfc-terms li {
    display: grid; grid-template-columns: 110px 1fr; gap: 12px;
    padding: 11px 4px; border-bottom: 1px dashed var(--pfc-line);
    font-size: 13.5px;
}
.pfc-terms li:last-child { border-bottom: 0; }
.pfc-terms li > b:first-child { color: var(--pfc-brass); font-size: 13px; padding-top: 1px; }
.pfc-terms li > b { color: var(--pfc-seal); font-weight: 700; }
.pfc-terms li { color: var(--pfc-ink-soft); }
.pfc-terms li > b:not(:first-child) { color: var(--pfc-ink); }

/* 摘要 / 操作 */
.pfc-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.pfc-pre {
    background: var(--pfc-paper);
    border: 1px solid var(--pfc-line);
    border-radius: 10px;
    padding: 14px 16px;
    font-size: 12.5px;
    font-family: var(--pfc-num);
    white-space: pre-wrap;
    word-break: break-all;
    color: var(--pfc-ink);
    margin: 0;
}

/* FAQ */
.pfc-faq { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.pfc-faq-item {
    background: var(--pfc-paper);
    border: 1px solid var(--pfc-line);
    border-radius: 12px;
    padding: 0 16px;
}
.pfc-faq-item summary {
    cursor: pointer; font-weight: 700; font-size: 14px;
    padding: 12px 0; list-style: none; position: relative; padding-right: 26px;
}
.pfc-faq-item summary::-webkit-details-marker { display: none; }
.pfc-faq-item summary::after {
    content: '+'; position: absolute; right: 2px; top: 10px;
    color: var(--pfc-brass); font-size: 18px; transition: transform .2s;
}
.pfc-faq-item[open] summary::after { transform: rotate(45deg); }
.pfc-faq-a { font-size: 13px; color: var(--pfc-ink-soft); padding: 0 0 14px; }
.pfc-faq-a b { color: var(--pfc-seal); }

/* 留言 */
.pfc-comments { margin-bottom: 20px; }

/* Toast */
.pfc-toast {
    position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
    background: var(--pfc-ink); color: var(--pfc-paper);
    padding: 10px 22px; border-radius: 999px; font-size: 13.5px;
    opacity: 0; pointer-events: none; transition: all .3s; z-index: 999;
}
.pfc-toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===================== A4 清单 ===================== */
.pfc-sheet { display: none; }

/* ===================== 响应式 ===================== */
@media (max-width: 1024px) {
    .pfc-hero { grid-template-columns: 1fr; }
    .pfc-dossier { max-width: 420px; }
    .pfc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pfc-kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pfc-plan-cards { grid-template-columns: 1fr; }
    .pfc-faq { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
    .pfc-hero { padding: 22px 18px; border-radius: 14px; }
    .pfc-panel { padding: 18px 16px; }
    .pfc-grid { grid-template-columns: 1fr; }
    .pfc-kpis { grid-template-columns: 1fr; }
    .pfc-cert-title { font-size: 14px; letter-spacing: .1em; }
    .pfc-terms li { grid-template-columns: 1fr; gap: 2px; }
    .pfc-panel-side { float: none; display: block; margin-top: 6px; }
}

/* ===================== 打印 ===================== */
@media print {
    body * { visibility: hidden; }
    .pfc-sheet, .pfc-sheet * { visibility: visible; }
    .pfc-sheet {
        display: block !important;
        position: absolute; left: 0; top: 0; width: 100%;
        background: #fff; color: #000;
        font-size: 12px; line-height: 1.6;
        padding: 8mm 10mm;
        box-sizing: border-box;
    }
    .pfc-sheet h2 { font-size: 17px; margin: 0 0 4px; }
    .pfc-sheet .pfc-sh-meta { font-size: 11px; color: #555; margin-bottom: 10px; }
    .pfc-sheet table { width: 100%; border-collapse: collapse; margin-bottom: 10px; }
    .pfc-sheet th, .pfc-sheet td { border: 1px solid #bbb; padding: 5px 8px; text-align: left; font-size: 11.5px; }
    .pfc-sheet th { background: #f0ece0; }
    .pfc-sheet .pfc-sh-kpis { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
    .pfc-sheet .pfc-sh-kpi { border: 1px solid #bbb; border-radius: 6px; padding: 6px 10px; font-size: 11.5px; }
    .pfc-sheet .pfc-sh-kpi b { display: block; font-size: 15px; }
    .pfc-sheet .pfc-sh-note { font-size: 11px; color: #555; border-top: 1px dashed #bbb; padding-top: 6px; }
}