/* ============================================================
   AmiPDF main.css — single source of truth for all pages
   Code-ification of docs/ui-spec-web.md (v1.3). Keep in sync.
   Sections: 1 tokens · 2 base · 3 layout · 4 header/dropdowns
   5 tool icon chips · 6 tool panel · 7 content blocks
   8 footer · 9 toast · 10 responsive
   RTL-ready: logical properties only (inline-start/end).
   ============================================================ */

/* ============ 1. Design tokens (ui-spec §2) ============ */
:root{
  --c-primary:#3D5AF1; --c-primary-strong:#2F49C9; --c-primary-tint:#EBEFFE;
  --c-success:#178A50; --c-success-tint:#E6F6EE;
  --c-danger:#D93636; --c-danger-tint:#FCEBEB;
  --c-warning:#B45309; --c-warning-tint:#FEF3E2;
  --c-ink:#111827; --c-ink-2:#4B5563; --c-ink-3:#9CA3AF;
  --c-border:#E5E7EB; --c-border-2:#D1D5DB;
  --c-bg:#FFFFFF; --c-bg-alt:#F8FAFC;
  --c-footer-bg:#0F172A; --c-footer-ink:rgba(255,255,255,.75);
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 4px 12px rgba(15,23,42,.08);
  --shadow-lg:0 12px 32px rgba(15,23,42,.12);
  --r-sm:6px; --r-md:8px; --r-lg:12px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}

/* ============ 2. Base ============ */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--c-ink);background:var(--c-bg);font-size:16px;line-height:26px}
a{color:var(--c-primary-strong);text-decoration:none}
a:hover{text-decoration:underline}
svg{display:block}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px;border-radius:4px}
.icon{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.icon-14{width:14px;height:14px}
.icon-16{width:16px;height:16px}
.icon-18{width:18px;height:18px}
.icon-20{width:20px;height:20px}
.icon-22{width:22px;height:22px}
.icon-28{width:28px;height:28px}
.icon-64{width:64px;height:64px}
.spin{animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}

/* ============ 3. Layout (§3 v1.4: content 1200px, tool panel 800px) ============ */
.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:20px}
/* header/footer 通栏（用户确认 2026-09-01）：背景条与内容都铺满视口，不进 1200 容器，仅留边距 */
.header-inner,.footer-inner{padding-inline:20px}
@media(min-width:1024px){.container,.header-inner,.footer-inner{padding-inline:48px}}
/* 工具页只有上传面板走 800px 居中；crumb 与 tool-head 随 container 1200（用户确认 2026-09-01） */
.tool-flow{max-width:800px;margin-inline:auto}

/* ============ 4. Header & dropdowns (§4.1) ============ */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--c-border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--c-ink)}
.logo:hover{text-decoration:none}
.logo svg{flex:none}
.header-nav{display:flex;align-items:center;gap:8px}
.nav-btn{display:flex;align-items:center;gap:8px;height:40px;padding-inline:14px;border:1px solid transparent;border-radius:var(--r-md);background:none;font-size:15px;font-weight:500;color:var(--c-ink-2);cursor:pointer}
.nav-btn:hover{background:var(--c-bg-alt);color:var(--c-ink)}
.nav-ws{font-weight:600;color:var(--c-ink)}   /* 顶栏工作台一级入口（用户确认保留：下拉不重复露出） */
.dropdown{position:relative}
.dropdown-panel{position:absolute;top:calc(100% + 8px);inset-inline-end:0;background:#fff;border:1px solid var(--c-border);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);padding:24px;display:none;grid-template-columns:repeat(3,220px);gap:24px;z-index:200}
.dropdown.open .dropdown-panel{display:grid}
.dd-group h4{font-size:12px;font-weight:600;color:var(--c-ink-3);text-transform:uppercase;letter-spacing:.04em;margin-bottom:12px}
.dd-group a{display:flex;align-items:center;gap:10px;font-size:14px;line-height:32px;color:var(--c-ink-2)}
.dd-group a:hover{color:var(--c-primary-strong)}
/* "View all tools" full-row link at bottom of All Tools dropdown (§4.1 v1.4) */
.dd-all{grid-column:1/-1;display:flex;align-items:center;gap:8px;margin-top:4px;padding-top:14px;border-top:1px solid var(--c-border);font-size:14px;font-weight:600;color:var(--c-primary-strong)}
.dd-all:hover{color:var(--c-primary);text-decoration:none}
.dd-all .icon{flex:none;transform:rotate(-90deg)}
[dir="rtl"] .dd-all .icon{transform:rotate(90deg)}
/* per-tool icon chips inside All Tools dropdown */
.dd-ico{width:20px;height:20px;border-radius:5px;color:#fff;display:flex;align-items:center;justify-content:center;flex:none}
/* language items: native names, no wrap, check on current */
.lang-item{white-space:nowrap}
.lang-item .lg-check{width:14px;height:14px;color:var(--c-primary);visibility:hidden;flex:none;fill:none;stroke:currentColor;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}
.lang-item[aria-current="true"]{color:var(--c-ink);font-weight:600}
.lang-item[aria-current="true"] .lg-check{visibility:visible}
/* language chips — flag for single-country locales, script chip for zh-Hant & ar */
.lg-flag{width:20px;height:15px;border-radius:3px;overflow:hidden;flex:none;box-shadow:inset 0 0 0 1px rgba(15,23,42,.10);display:block}
.lg-flag svg{display:block;width:100%;height:100%}
.lg-badge{width:20px;height:15px;border-radius:3px;font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none;line-height:1}
.lg-zh-hant{background:#FEF3E2;color:#B45309}
.lg-ar{background:#E6F3F4;color:#0E7490}
#lang-dd .dropdown-panel{grid-template-columns:1fr 1fr;min-width:480px}
@media(max-width:1023px){
  .header-nav .nav-label{display:none}
}

/* ============ 5. Tool icon chips (§6, 18 gradients) ============ */
.t-ico{width:48px;height:48px;border-radius:12px;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 6px rgba(15,23,42,.12)}
.ti-merge{background:linear-gradient(135deg,#3D5AF1,#7C9EFF)}
.ti-split{background:linear-gradient(135deg,#0E9F8F,#4ED8C4)}
.ti-organize{background:linear-gradient(135deg,#6366F1,#9AA5FB)}
.ti-workspace{background:linear-gradient(135deg,#2563EB,#7CA6F9)}
.ti-rotate{background:linear-gradient(135deg,#8B5CF6,#B892FB)}
.ti-delete{background:linear-gradient(135deg,#EF4444,#F98A8A)}
.ti-extract{background:linear-gradient(135deg,#F59E0B,#FBC153)}
.ti-numbers{background:linear-gradient(135deg,#0891B2,#4FC8E0)}
.ti-crop{background:linear-gradient(135deg,#D97706,#F0A64B)}
.ti-img2pdf{background:linear-gradient(135deg,#F97316,#FB9E5C)}
.ti-jpg2pdf{background:linear-gradient(135deg,#F43F5E,#FB8AA2)}
.ti-png2pdf{background:linear-gradient(135deg,#22C55E,#6FD98F)}
.ti-pdf2jpg{background:linear-gradient(135deg,#E11D8F,#F268B8)}
.ti-pdf2png{background:linear-gradient(135deg,#10B981,#5FD9AC)}
.ti-watermark{background:linear-gradient(135deg,#14B8A6,#5FD9CB)}
.ti-protect{background:linear-gradient(135deg,#16A34A,#5FBF84)}
.ti-unlock{background:linear-gradient(135deg,#EAB308,#F5D04B)}
.ti-analyzer{background:linear-gradient(135deg,#7C3AED,#A980F2)}
.ti-metadata{background:linear-gradient(135deg,#64748B,#94A3B8)}

/* ============ 6. Tool panel (§4.4-4.7) ============ */
.crumb{font-size:14px;color:var(--c-ink-2);padding-block:24px 4px}
.crumb a{color:var(--c-ink-2)}
.crumb span[aria-current]{color:var(--c-ink-3)}
.tool-head h1{font-size:32px;line-height:40px;font-weight:700;letter-spacing:-.01em}
.trust-sub{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--c-ink-2);margin:8px 0 24px}
.trust-sub .dot{color:var(--c-border-2)}
.trust-sub strong{color:var(--c-success);font-weight:600}
.tool-panel{background:#fff;border:1px solid var(--c-border);border-radius:16px;box-shadow:var(--shadow-sm);padding:24px}
.dropzone{border:2px dashed var(--c-border-2);border-radius:var(--r-lg);min-height:240px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;text-align:center;padding:32px 16px;cursor:pointer;transition:border-color .15s,background .15s}
.dropzone:hover,.dropzone.dragover{border-color:var(--c-primary);background:var(--c-primary-tint)}
.dropzone .dz-icon{width:64px;height:64px;color:var(--c-primary);margin-bottom:8px}
.dropzone .dz-main{font-size:17px;font-weight:600}
.dropzone .dz-sub{font-size:14px;color:var(--c-ink-2)}
.dropzone .dz-cap{font-size:12px;color:var(--c-ink-3)}
.file-list{margin-top:16px;display:flex;flex-direction:column;gap:8px}
.file-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-bg-alt)}
.file-row .f-ico{color:var(--c-primary);flex:none}
.file-row .f-name{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-row .f-meta{font-size:12px;color:var(--c-ink-3);flex:none}
.file-row .f-acts{margin-inline-start:auto;display:flex;gap:4px;flex:none}
/* 文件卡网格（v1.10 merge-pdf：listOpts.thumb 开启）——缩略图上/名称下/操作按钮卡底，
   整卡拖拽排序（.dragover 高亮落点），"+ 续加"入口转为等高虚线卡（§4.10a） */
.file-list.as-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.file-row.as-card{flex-direction:column;align-items:stretch;gap:4px;padding:10px;cursor:grab}
.file-row.as-card:active{cursor:grabbing}
.file-row.as-card.dragover{border-color:var(--c-primary)}
.file-row.as-card .f-thumb{height:140px;display:flex;align-items:center;justify-content:center;background:var(--c-bg);border-radius:var(--r-sm);overflow:hidden}
.file-row.as-card .f-thumb canvas{max-width:100%;max-height:100%;display:block}
.file-row.as-card .f-thumb .f-ico{color:var(--c-ink-3)}
.file-row.as-card .f-name{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:40px}
.file-row.as-card .f-acts{margin-inline-start:0;justify-content:center} /* 归零基类 auto 边距（K3 缺陷2：auto 优先于 stretch，会把按钮组推到卡缘使居中失效） */
.file-list.as-cards .btn-link{min-height:200px;border:1px dashed var(--c-border);border-radius:var(--r-md);font-size:28px;color:var(--c-ink-3);background:transparent}
.file-list.as-cards .btn-link:hover{border-color:var(--c-primary);color:var(--c-primary);text-decoration:none}
.icon-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border:none;background:none;border-radius:var(--r-sm);color:var(--c-ink-2);cursor:pointer}
.icon-btn:hover{background:var(--c-primary-tint);color:var(--c-primary-strong)}
.icon-btn:disabled{opacity:.35;cursor:default}
.icon-btn:disabled:hover{background:none;color:var(--c-ink-2)}
.opt-panel{margin-top:16px;border-top:1px solid var(--c-border);padding-top:16px}
.opt-label{font-size:14px;font-weight:600;margin-bottom:8px;color:var(--c-ink)}
.hint{font-size:13px;color:var(--c-ink-3);margin-top:8px}
.action-bar{margin-top:20px;display:flex;flex-direction:column;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding-inline:28px;border-radius:var(--r-md);font-size:16px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:background .15s}
.btn-primary{background:var(--c-primary);color:#fff;width:100%}
.btn-primary:hover:not(:disabled){background:var(--c-primary-strong)}
.btn-primary:disabled{opacity:.4;cursor:not-allowed}
.btn-success{background:var(--c-success);color:#fff;width:100%}
.btn-success:hover{background:#136B3E}
.btn-link{background:none;border:none;color:var(--c-primary-strong);font-size:14px;height:auto;padding:0;cursor:pointer}
.btn-link:hover{text-decoration:underline}
.progress-wrap{margin-top:20px}
.progress-track{height:6px;border-radius:999px;background:var(--c-border);overflow:hidden}
.progress-bar{height:100%;width:0;background:var(--c-primary);border-radius:999px;transition:width .2s}
.progress-text{font-size:14px;color:var(--c-ink-2);margin-top:8px;display:flex;justify-content:space-between}
.result-card{margin-top:20px;background:var(--c-success-tint);border:1px solid #CBE9D8;border-radius:var(--r-lg);padding:20px}
.result-top{display:flex;align-items:center;gap:12px}
.result-top .r-ico{color:var(--c-success)}
.result-name{font-size:15px;font-weight:600}
.result-meta{font-size:13px;color:var(--c-ink-2)}
.result-acts{margin-top:16px;display:flex;flex-direction:column;gap:8px}

/* ============ 7. Content blocks (§4.8, §5) ============ */
/* Home / hub / all-tools hero (§5.1/5.4; v1.4 补齐，此前无样式) */
.home-hero{text-align:center;padding-block:48px 8px}
.home-hero h1{font-size:40px;line-height:48px;font-weight:700;letter-spacing:-.015em;max-width:760px;margin-inline:auto}
.home-sub{color:var(--c-ink-2);font-size:16px;line-height:26px;max-width:640px;margin:12px auto 0}
.home-trust{justify-content:center}
.home-search{display:flex;align-items:center;gap:10px;max-width:520px;margin:24px auto 0;padding:7px 18px;background:#fff;border:1px solid var(--c-border-2);border-radius:999px;box-shadow:var(--shadow-sm)}
.home-search:focus-within{border-color:var(--c-primary);box-shadow:0 0 0 3px var(--c-primary-tint)}
.home-search .icon{color:var(--c-ink-3);flex:none}
.home-search input{flex:1;min-width:0;border:none;outline:none;background:none;font:inherit;font-size:15px;color:var(--c-ink)}
.hero-chips{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:20px}
.hero-chip{display:inline-flex;align-items:center;gap:8px;height:38px;padding-inline:14px;border-radius:999px;border:1px solid var(--c-border);background:#fff;font-size:14px;font-weight:500;color:var(--c-ink)}
.hero-chip:hover{border-color:var(--c-primary);color:var(--c-primary-strong);text-decoration:none;box-shadow:var(--shadow-sm)}
.hero-chip .t-ico{width:22px;height:22px;border-radius:6px}
/* 首页满宽渐变 hero 带（§5.1 v1.7）：全宽出血 + 内层 .container；基础 .home-hero 保持浅色态供 all-tools 页复用 */
.home-hero-band{position:relative;overflow:hidden;background:linear-gradient(135deg,#2F49C9 0%,#3D5AF1 55%,#4A6CF7 100%)}
.home-hero-band .home-hero{padding-block:76px 56px}
.home-hero-band .home-hero h1{font-size:48px;line-height:58px;letter-spacing:-.02em;color:#fff}
.home-hero-band .home-sub{color:rgba(255,255,255,.88)}
.home-hero-band .home-trust{color:rgba(255,255,255,.85);margin-top:14px}
.home-hero-band .home-trust .dot{color:rgba(255,255,255,.55)}
.home-hero-band .home-trust strong{color:#fff}
.home-hero-band .home-search{margin-top:28px;max-width:560px;padding:13px 22px;box-shadow:var(--shadow-lg)}
.home-hero-band .home-search:focus-within{box-shadow:0 0 0 3px rgba(255,255,255,.35)}
.home-hero-band .hero-chips{margin-top:24px}
.home-hero-band .hero-chip{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.3);color:#fff}
.home-hero-band .hero-chip:hover{background:rgba(255,255,255,.22);border-color:rgba(255,255,255,.6);color:#fff;box-shadow:none}
.hero-deco{position:absolute;pointer-events:none}
.hero-deco-ring{width:320px;height:320px;top:-90px;inset-inline-start:-70px}
.hero-deco-docs{width:380px;height:308px;bottom:-40px;inset-inline-end:-50px}
.view-all{display:inline-flex;align-items:center;gap:6px;margin-top:20px;font-size:14px;font-weight:600}
/* ============ 8. 通用缩略图卡网格 + 页面大图弹窗（§4.10 v1.8，AmiTool.viewPage）============ */
.pt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-top:12px}
.pt-card{position:relative}
.pt-main{display:block;width:100%;padding:8px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-bg);cursor:pointer;text-align:center}
.pt-main:hover{border-color:var(--c-primary);box-shadow:var(--shadow-sm)}
.pt-main:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}
.pt-main[aria-pressed="true"]{border-color:var(--c-danger);background:var(--c-danger-tint)}
.pt-main canvas{display:block;width:100%;height:auto;min-height:60px;background:#fff;border-radius:4px}
.pt-main[aria-pressed="true"] canvas{opacity:.45}
.pt-num{display:block;margin-top:6px;font-size:12px;line-height:18px;color:var(--c-ink-2)}
.pt-main[aria-pressed="true"] .pt-num{color:var(--c-danger);font-weight:600;text-decoration:line-through}
.pt-zoom{position:absolute;top:14px;inset-inline-end:14px;display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:999px;border:1px solid var(--c-border-2);background:var(--c-bg);color:var(--c-ink-2);box-shadow:var(--shadow-sm)}
.pt-zoom:hover{border-color:var(--c-primary);color:var(--c-primary-strong)}
.lightbox{position:fixed;inset:0;z-index:250;background:rgba(15,23,42,.72);display:flex;align-items:center;justify-content:center;padding:24px}
.lb-panel{background:var(--c-bg);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);max-width:calc(100vw - 48px);max-height:calc(100dvh - 48px);display:flex;flex-direction:column;overflow:hidden}
.lb-body{overflow:auto;padding:16px;display:flex;justify-content:center;align-items:flex-start;background:var(--c-bg-alt)}
.lb-body canvas{max-width:100%;height:auto;background:#fff;border-radius:4px;box-shadow:var(--shadow-sm)}
.lb-bar{display:flex;align-items:center;gap:12px;padding:12px 16px;border-top:1px solid var(--c-border)}
.lb-cap{font-size:14px;font-weight:600;color:var(--c-ink);flex:1}
.lb-act{display:inline-flex;align-items:center;gap:6px;height:36px;padding-inline:14px;border-radius:var(--r-md);border:1px solid var(--c-border-2);background:var(--c-bg);font:inherit;font-size:14px;font-weight:500;color:var(--c-ink);cursor:pointer}
.lb-act:hover{border-color:var(--c-primary);color:var(--c-primary-strong)}
.lb-act[aria-pressed="true"]{background:var(--c-danger-tint);border-color:var(--c-danger);color:var(--c-danger)}
.lb-close{position:absolute;top:20px;inset-inline-end:20px;display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:999px;border:1px solid var(--c-border-2);background:var(--c-bg);color:var(--c-ink);box-shadow:var(--shadow-sm);cursor:pointer}
/* stats band: full-bleed background, inner .container limits content (§3 v1.4) */
.stats-band{background:var(--c-bg-alt);border-top:1px solid var(--c-border);border-bottom:1px solid var(--c-border);margin-top:56px;padding-block:32px}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat .s-num{font-size:28px;line-height:36px;font-weight:700;color:var(--c-primary-strong)}
.stat .s-label{font-size:13px;color:var(--c-ink-2);margin-top:2px}
.section{margin-top:56px}
.section-intro p{color:var(--c-ink-2);font-size:15px;line-height:24px;margin-top:8px}
.section h2{font-size:24px;line-height:32px;font-weight:600;letter-spacing:-.01em}
/* 法律/公司页排版（about·contact·terms·privacy ×15 语种共用 legal.html，2026-09-02）：
   760px 阅读行宽居中（中文约 45 字/行），标题/段距/条款编号显式声明 */
.legal-body{max-width:760px;margin-inline:auto}
.legal-body h1{font-size:32px;line-height:40px;font-weight:700;letter-spacing:-.01em;margin-bottom:8px}
.legal-body p{margin-top:16px;color:var(--c-ink-2);text-wrap:pretty}
.legal-body strong{color:var(--c-ink)}
.legal-body .hint{margin-top:28px}
.howto-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}
.step-card{background:var(--c-bg-alt);border-radius:var(--r-lg);padding:24px}
.step-num{width:32px;height:32px;border-radius:999px;background:var(--c-primary-tint);color:var(--c-primary-strong);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;margin-bottom:12px}
.step-card h3{font-size:16px;font-weight:600;margin-bottom:4px}
.step-card p{font-size:14px;line-height:22px;color:var(--c-ink-2)}
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}
.feat{padding:20px;border:1px solid var(--c-border);border-radius:var(--r-lg)}
.feat .f-ico2{width:40px;height:40px;border-radius:var(--r-md);background:var(--c-primary-tint);color:var(--c-primary-strong);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.feat h3{font-size:15px;font-weight:600}
.feat p{font-size:14px;line-height:22px;color:var(--c-ink-2);margin-top:4px}
.usecase-wrap{display:grid;grid-template-columns:5fr 7fr;gap:40px;margin-top:8px;align-items:start}
.usecase-wrap p{color:var(--c-ink-2);font-size:15px;line-height:24px;margin-top:8px}
.chip-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.chip{display:flex;align-items:center;gap:12px;padding:14px 16px;border:1px solid var(--c-border);border-radius:var(--r-md);background:#fff;font-size:14px;font-weight:500;color:var(--c-ink)}
.chip svg{color:var(--c-primary);flex:none}
.platform-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-top:24px}
.platform{padding:20px 12px;text-align:center;border:1px solid var(--c-border);border-radius:var(--r-lg)}
.platform svg{margin-inline:auto 10px;color:var(--c-primary)}
.platform h3{font-size:14px;font-weight:600}
.platform p{font-size:12px;line-height:18px;color:var(--c-ink-3);margin-top:2px}
.faq details{border-bottom:1px solid var(--c-border)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-block:16px;font-size:16px;font-weight:600;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary svg{flex:none;transition:transform .15s;color:var(--c-ink-3)}
.faq details[open] summary svg{transform:rotate(180deg)}
.faq .faq-a{padding-block-end:16px;font-size:15px;line-height:24px;color:var(--c-ink-2)}
.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}
.tool-card{display:flex;flex-direction:column;gap:8px;padding:20px;background:#fff;border:1px solid var(--c-border);border-radius:var(--r-lg);color:var(--c-ink);transition:box-shadow .15s,transform .15s}
.tool-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);text-decoration:none}
.tool-card .t-name{font-size:16px;font-weight:600}
.tool-card .t-desc{font-size:14px;line-height:22px;color:var(--c-ink-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.cta-banner{margin-top:64px;background:var(--c-primary-tint);border-radius:20px;padding:48px 32px;text-align:center}
.cta-banner h2{font-size:26px;line-height:34px;font-weight:700}
.cta-banner p{color:var(--c-ink-2);font-size:15px;margin:8px auto 24px}
.cta-banner .btn{background:var(--c-primary);color:#fff;height:48px;padding-inline:32px}
.cta-banner .btn:hover{background:var(--c-primary-strong)}

/* ============ 8. Footer (§4.2) ============ */
.site-footer{background:var(--c-footer-bg);color:var(--c-footer-ink);margin-top:72px;padding-block:48px 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}/* 品牌列 2fr→1.4fr（2026-09-02）：三列链接区等宽更均衡 */
.footer-brand .logo{color:#fff}
.footer-brand p{font-size:14px;line-height:22px;margin-top:12px}
.f-col h4{font-size:13px;font-weight:600;color:#fff;text-transform:uppercase;letter-spacing:.04em;margin-bottom:12px}
.f-col a{display:block;font-size:14px;line-height:26px;color:var(--c-footer-ink)}
.f-col a:hover{color:#fff;text-decoration:none}
.footer-bottom{margin-top:40px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:var(--c-footer-ink)}

/* ============ 9. Toast (§4.9) ============ */
.toast{position:fixed;inset-inline-end:20px;bottom:20px;z-index:300;background:var(--c-ink);color:#fff;font-size:14px;padding:12px 18px;border-radius:var(--r-md);box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:opacity .2s}
.toast.show{opacity:1}
@media(max-width:1023px){.toast{inset-inline:20px auto 20px;bottom:auto;top:12px;margin-inline:auto}}

/* ============ 10. Responsive (§7) ============ */
@media(max-width:1023px){
  .tool-grid{grid-template-columns:repeat(2,1fr)}
  .howto-grid{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .usecase-wrap{grid-template-columns:1fr;gap:24px}
  .platform-grid{grid-template-columns:repeat(3,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  /* 移动端下拉 = 通栏 sheet：固定在顶栏(64px)下沿、全宽、单列、内部滚动
     （ui-spec §4.1 抽屉化；原 inset-inline:0 锚在按钮宽的 .dropdown 上导致面板被压成窄条） */
  .dropdown-panel{position:fixed;top:64px;inset-inline:0;max-height:calc(100vh - 80px);max-height:calc(100dvh - 80px);overflow:auto;grid-template-columns:1fr;gap:20px;padding:20px 20px 24px;border-inline:none;border-top:none;border-radius:0 0 var(--r-lg) var(--r-lg)}
  /* 语言面板须同时压掉 #lang-dd 基础规则（min-width:480 / 1fr 1fr），否则 ID 优先级胜过本块 */
  #lang-dd .dropdown-panel{grid-template-columns:1fr 1fr;min-width:0;column-gap:24px}
  #lang-dd .dd-group h4{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:639px){
  .tool-grid{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:repeat(2,1fr)}
  .chip-grid{grid-template-columns:1fr}
  #lang-dd .dropdown-panel{grid-template-columns:1fr}
  .tool-head h1{font-size:26px;line-height:34px}
  .legal-body h1{font-size:26px;line-height:34px}
  .home-hero h1{font-size:28px;line-height:36px}
  .home-hero-band .home-hero{padding-block:52px 40px}
  .home-hero-band .home-hero h1{font-size:28px;line-height:36px}
  .hero-deco-ring{width:180px;height:180px;top:-50px;inset-inline-start:-40px}
  .hero-deco-docs{width:220px;height:178px;bottom:-24px;inset-inline-end:-30px}
}

/* ---------- 满宽工作台模式（上传后 body.app-mode，common.js setWorkspace 切换）----------
   隐去营销板块、工具面板破格满宽（落地页内容留 DOM，仅不可见）；返回按钮常驻右上。 */
body.app-mode main>.container{max-width:none;padding-inline:24px}
body.app-mode .tool-flow{max-width:none}
body.app-mode .crumb,
body.app-mode .tool-head,
body.app-mode .stats-band,
body.app-mode .section,
body.app-mode .cta-banner,
body.app-mode .site-footer{display:none}
.ws-back{position:fixed;top:76px;inset-inline-end:24px;z-index:60;height:38px;padding-inline:14px;border:1px solid var(--c-border-2);border-radius:var(--r-md);background:#fff;font:inherit;font-size:14px;font-weight:500;color:var(--c-ink-2);cursor:pointer;box-shadow:var(--shadow-sm)}
.ws-back:hover{color:var(--c-primary-strong);border-color:var(--c-primary)}
.ws-back:disabled{opacity:.55;cursor:default;pointer-events:none}
body:not(.app-mode) .ws-back{display:none}

/* ===================== 工作台 Workspace（ui-spec §13，功能真源 docs/workspace-spec-v1.md）===================== */
#ws-app{position:fixed;inset-block:64px 0;inset-inline:0;z-index:50;display:none;flex-direction:column;background:var(--c-bg)}
body.app-mode #ws-app.on{display:flex}
.ws-top{display:flex;align-items:center;gap:12px;min-height:56px;padding:8px 16px;border-bottom:1px solid var(--c-border);background:#fff;flex-wrap:wrap}
.ws-top .ws-brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;color:var(--c-ink)}
.ws-stat{font-size:13px;color:var(--c-ink-2)}
/* K3 用户反馈：右组整体分组 + auto margin——原 spacer(flex:1) 在 wrap 容器抢占首行全部剩余宽度，
   强制把缩放/文件名/导出挤到第二行（宽度充足也折）；分组后空间不足时右组整体折行、组内不散 */
.ws-top-right{display:flex;align-items:center;gap:12px;margin-inline-start:auto;flex-wrap:wrap}
/* topbar 文件名输入框（基础规则必须在 <640 媒体查询之前，同特异性后者覆盖前者的 flex 拉伸）；
   等高行高 + 零纵向 padding 抵消 font:inherit 继承的 26px line-height 致文字贴顶 */
.ws-input.ws-fname{width:200px;flex:0 1 200px;min-width:110px;height:36px;line-height:34px;padding-block:0}
.ws-back-btn{white-space:nowrap}
@media (max-width:1023px){.ws-stat{display:none}}
/* 旧 .ws-fname 基础规则已前移至 .ws-top-right 之后（媒体查询之前），此处勿再添加同名规则 */
.ws-back-btn{height:38px;padding-inline:14px;border:1px solid var(--c-border-2);border-radius:var(--r-md);background:#fff;font:inherit;font-size:14px;font-weight:500;color:var(--c-ink-2);cursor:pointer}
.ws-back-btn:hover{color:var(--c-primary-strong);border-color:var(--c-primary)}
.ws-seg{display:inline-flex;border:1px solid var(--c-border-2);border-radius:8px;overflow:hidden}
.ws-seg button{height:34px;min-width:38px;border:0;background:#fff;font:inherit;font-size:13px;color:var(--c-ink-2);cursor:pointer;padding-inline:10px;border-inline-start:1px solid var(--c-border)}
.ws-seg button:first-child{border-inline-start:0}
.ws-seg button[aria-pressed="true"]{background:var(--c-primary-tint);color:var(--c-primary-strong);font-weight:600}
.ws-rail{display:flex;align-items:center;gap:8px;overflow-x:auto;padding:8px 16px;border-bottom:1px solid var(--c-border);background:var(--c-bg-alt); scrollbar-width:thin}
.ws-chip{display:flex;align-items:center;gap:8px;border:1px solid var(--c-border);background:#fff;border-radius:8px;padding:4px 8px;font-size:12px;color:var(--c-ink-2);white-space:nowrap;flex:0 0 auto}
.ws-chip.dragover{border-color:var(--c-primary)}
.ws-chip .ws-mini{width:24px;height:32px;border-radius:3px;background:#fff;border:1px solid var(--c-border);overflow:hidden;display:flex;align-items:center;justify-content:center}
.ws-chip .ws-mini canvas{max-width:100%;max-height:100%}
.ws-chip .ws-chip-name{max-width:140px;overflow:hidden;text-overflow:ellipsis;color:var(--c-ink)}
.ws-chip-add{border-style:dashed;color:var(--c-ink-2);cursor:pointer;display:inline-flex;align-items:center;gap:6px;flex:0 0 auto}
.ws-chip-add:hover{border-color:var(--c-primary);color:var(--c-primary-strong)}
#ws-canvas{flex:1;overflow-y:auto;background:var(--c-bg-alt);--ws-cw:120px}
#ws-canvas[data-scale="s"]{--ws-cw:90px}
#ws-canvas[data-scale="l"]{--ws-cw:170px}
.ws-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(var(--ws-cw),1fr));gap:12px;padding:20px}
.ws-card{position:relative;border:2px solid var(--c-border);border-radius:8px;background:#fff;overflow:hidden;cursor:pointer;user-select:none;-webkit-user-select:none}
.ws-card:hover{border-color:var(--c-border-2)}
.ws-card.sel{border-color:var(--c-primary)}
.ws-card.sel::after{content:"";position:absolute;inset:0;background:var(--c-primary-tint);opacity:.35;pointer-events:none}
.ws-card.dragging{opacity:.4}
.ws-card.drop-before{box-shadow:-5px 0 0 var(--c-primary)}
.ws-card.drop-after{box-shadow:5px 0 0 var(--c-primary)}
.ws-ph{position:relative;width:100%;background:var(--c-bg-alt)}
.ws-ph canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.ws-num{position:absolute;top:6px;inset-inline-start:6px;z-index:2;font-size:11px;line-height:1;background:rgba(255,255,255,.92);border-radius:4px;padding:3px 6px;color:var(--c-ink-2);pointer-events:none}
.ws-quick{position:absolute;top:6px;inset-inline-end:6px;z-index:3;display:none;gap:2px;background:rgba(255,255,255,.95);border-radius:6px;padding:2px;box-shadow:var(--shadow-sm)}
.ws-card:hover .ws-quick,.ws-card:focus-within .ws-quick{display:flex}
.ws-quick .icon-btn{width:26px;height:26px}
.ws-check{position:absolute;bottom:6px;inset-inline-end:6px;z-index:2;width:20px;height:20px;border-radius:50%;border:2px solid #fff;background:rgba(255,255,255,.55);display:flex;align-items:center;justify-content:center;color:#fff;pointer-events:none}
.ws-check .icon{width:12px;height:12px}   /* K3 缺陷8：尺寸表无 .icon-12，勾图标原回落 24px 溢出圆框 */
.ws-card.sel .ws-check{background:var(--c-primary);border-color:var(--c-primary)}
.ws-actions{display:flex;align-items:center;gap:8px;min-height:56px;padding:8px 16px;border-top:1px solid var(--c-border);background:#fff;flex-wrap:wrap}
.ws-abtn{display:inline-flex;align-items:center;gap:6px;height:38px;padding-inline:12px;border:1px solid var(--c-border-2);border-radius:8px;background:#fff;font:inherit;font-size:14px;color:var(--c-ink);cursor:pointer}
.ws-abtn:hover:not(:disabled){border-color:var(--c-primary);color:var(--c-primary-strong)}
.ws-abtn:disabled{opacity:.4;cursor:default}
.ws-abtn.danger{color:var(--c-danger)}
.ws-abtn.danger:hover:not(:disabled){border-color:var(--c-danger)}
.ws-abtn.primary{background:var(--c-primary);border-color:var(--c-primary);color:#fff;font-weight:600}
.ws-abtn.primary:hover:not(:disabled){background:var(--c-primary-strong);color:#fff}
.ws-abtn .icon{flex:0 0 auto}
.ws-selinfo{font-size:13px;color:var(--c-ink-2)}
.ws-prog{position:absolute;top:0;inset-inline:0;height:3px;z-index:5;display:none}
.ws-prog i{display:block;height:100%;width:0;background:var(--c-primary);transition:width .2s}
#ws-app .ws-prog.on{display:block}
@media (max-width:639px){
  .ws-top{padding:6px 12px;gap:8px}
  .ws-top-right{gap:8px;flex:1 1 100%}   /* 右组占满折行后的整行，fname 才能相对全宽拉伸 */
  .ws-input.ws-fname{order:9;flex:1 1 100%}   /* 手机：文件名框独占末行全宽，缩放+导出保住同行 */
  .ws-rail{padding:6px 12px}
  .ws-grid{gap:8px;padding:12px}
  .ws-quick{display:none!important}   /* 触屏无 hover：单页操作走选中 + 底部工具条（§13.2 降级口径） */
}

/* ---------- 工作台侧面板（§13.3：拆分 / 页码）与页码预览叠加 ---------- */
.ws-panel{position:fixed;top:120px;bottom:56px;inset-inline-end:0;width:320px;z-index:55;background:#fff;border-inline-start:1px solid var(--c-border);box-shadow:var(--shadow-lg);display:flex;flex-direction:column}
.ws-panel[hidden]{display:none}
.ws-panel-head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--c-border)}
.ws-panel-head h3{margin:0;font-size:16px;font-weight:600}
.ws-panel-body{padding:16px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}
.ws-field{display:flex;flex-direction:column;gap:6px}
.ws-field>label{font-size:14px;font-weight:600}
.ws-field .hint{font-size:12px;color:var(--c-ink-3)}
.ws-input,.ws-select{height:40px;border:1px solid var(--c-border-2);border-radius:8px;padding-inline:10px;font:inherit;font-size:14px;background:#fff}
.ws-input:focus,.ws-select:focus{outline:2px solid var(--c-primary);outline-offset:2px;border-color:var(--c-primary)}
.ws-checkline{display:flex;align-items:center;gap:8px;font-size:14px}
.ws-checkline input{width:16px;height:16px;accent-color:var(--c-primary)}
.ws-grid9{display:grid;grid-template-columns:repeat(3,36px);gap:4px;justify-content:start}
.ws-grid9 button{width:36px;height:28px;border:1px solid var(--c-border-2);border-radius:6px;background:#fff;cursor:pointer;position:relative}
.ws-grid9 button[aria-pressed="true"]{background:var(--c-primary-tint);border-color:var(--c-primary)}
.ws-grid9 button::after{content:"";position:absolute;inset:10px 12px;border-block:2px solid var(--c-ink-3);border-radius:1px}
.ws-grid9 button[aria-pressed="true"]::after{border-color:var(--c-primary-strong)}
.ws-pn-feedback{font-size:12px;color:var(--c-ink-3);min-height:16px}
.ws-pn-feedback.err{color:var(--c-danger)}
.ws-pn{position:absolute;z-index:2;pointer-events:none;font-weight:600;color:#374151;background:rgba(255,255,255,.72);padding:0 2px;border-radius:2px;line-height:1.2}
.ws-pn.pos-0{top:3px;inset-inline-start:3px}
.ws-pn.pos-1{top:3px;inset-inline-start:50%;transform:translateX(-50%)}
.ws-pn.pos-2{top:3px;inset-inline-end:3px}
.ws-pn.pos-3{top:50%;inset-inline-start:3px;transform:translateY(-50%)}
.ws-pn.pos-4{top:50%;inset-inline-start:50%;transform:translate(-50%,-50%)}
.ws-pn.pos-5{top:50%;inset-inline-end:3px;transform:translateY(-50%)}
.ws-pn.pos-6{bottom:3px;inset-inline-start:3px}
.ws-pn.pos-7{bottom:3px;inset-inline-start:50%;transform:translateX(-50%)}
.ws-pn.pos-8{bottom:3px;inset-inline-end:3px}
.ws-prog-cancel{position:absolute;top:8px;inset-inline-end:12px;z-index:6;font-size:12px;color:var(--c-ink-2);background:rgba(255,255,255,.9);border:1px solid var(--c-border);border-radius:6px;padding:2px 10px;cursor:pointer;display:none}
.ws-prog-cancel.on{display:inline-block}
/* 首页 hero 工作台主 CTA（H1，保留搜索/chips/工具矩阵） */
.ws-hero-cta{margin-top:22px}
.ws-hero-btn{display:inline-flex;align-items:center;gap:10px;height:52px;padding-inline:24px;background:#fff;color:var(--c-primary-strong);font-weight:700;font-size:17px;border-radius:var(--r-md);box-shadow:var(--shadow-lg);transition:transform .15s,box-shadow .15s}
.ws-hero-btn:hover{transform:translateY(-1px);box-shadow:0 16px 40px rgba(15,23,42,.25)}
.ws-hero-btn .icon{transition:transform .15s}
[dir="rtl"] .ws-hero-btn .icon{transform:scaleX(-1)}
.ws-hero-note{margin:10px 0 0;font-size:14px;line-height:22px;color:rgba(255,255,255,.88)}
/* K3(1509) 缺陷3：返回箭头用水平镜像（LTR←），RTL 不变换——±90° 旋转让方向随 RTL 上下翻转是错的 */
.ws-back-btn .icon{transform:scaleX(-1)}
[dir="rtl"] .ws-back-btn .icon{transform:none}
/* .ws-fname 基础规则已移至 §13 工作台块 .ws-top-right 之后（须在 <640 媒体查询之前） */
@media (max-width:639px){
  .ws-hero-btn{width:100%;justify-content:center;height:48px;font-size:16px}
  .ws-hero-cta{margin-top:16px}
}
@media (max-width:639px){
  .ws-panel{top:auto;bottom:0;left:0;right:0;width:auto;max-height:70dvh;border-inline-start:0;border-block-start:1px solid var(--c-border)}
}