/* ============================================================
   TextEraser 设计系统 v2 —— "Paper & Ink Studio"
   方向：暖纸底 + 墨青主色 + 珊瑚强调；Sora 展示字体（CJK 回退系统）
   结构对标 remove.bg：工具即首屏 → 真实对比 → 推广带 → 步骤 → FAQ
   ============================================================ */

:root {
  --paper: #f6f3ec;        /* 暖纸底 */
  --card: #ffffff;
  --ink: #14201f;          /* 墨色正文 */
  --muted: #5f6f6d;
  --primary: #0e6e63;      /* 深青绿 */
  --primary-dark: #0a544c;
  --primary-soft: #e3efec;
  --coral: #f4623a;        /* 珊瑚强调（下载/CTA 焦点） */
  --coral-dark: #d9481f;
  --border: #e4e0d5;
  --radius: 16px;
  --font-display: "Sora", "PingFang SC", "Microsoft YaHei", "Hiragino Sans", "Noto Sans SC", sans-serif;
  --font-body: "Sora", -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans", sans-serif;
  --shadow-card: 0 1px 2px rgba(20,32,31,.05), 0 10px 30px -12px rgba(20,32,31,.14);
  --shadow-pop: 0 18px 44px -14px rgba(20,32,31,.28);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--paper); color: var(--ink); line-height: 1.65; font-size: 16px; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 22px; }
.container-narrow { max-width: 780px; }
:focus-visible { outline: 2.5px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; margin-bottom: 26px; text-align: center; }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(246,243,236,.86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; gap: 18px; height: 62px; }
.logo { display: flex; align-items: center; gap: 9px; text-decoration: none; color: var(--ink); }
.logo-mark { font-size: 21px; }
.logo-word { font-family: var(--font-display); font-weight: 500; font-size: 19px; letter-spacing: -0.02em; }
.logo-word b { font-weight: 800; color: var(--primary); }
.main-nav { display: flex; gap: 4px; margin-left: 8px; }
.main-nav a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500; padding: 7px 11px; border-radius: 9px; transition: all .15s; }
.main-nav a:hover { color: var(--primary); background: var(--primary-soft); }
/* Prelaunch feature badge in the top nav (e.g. PPTX Converter — coming soon). */
.nav-badge { display: inline-block; margin-left: 4px; padding: 1px 7px; border-radius: 999px; background: #eef2ff; color: #4f46e5; font-size: 11px; font-weight: 600; vertical-align: 1px; }
/* Inert prelaunch nav item: styled like a nav link but not clickable. */
.nav-prelaunch { color: var(--muted); font-size: 14px; font-weight: 500; padding: 7px 11px; border-radius: 9px; cursor: default; }
/* Inert prelaunch promo CTA: rendered as a button-looking span, never a link. */
.promo-prelaunch { cursor: default; opacity: .85; }
.header-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang-select { padding: 6px 8px; border: 1px solid var(--border); border-radius: 9px; font-size: 13px; background: #fff; color: var(--ink); cursor: pointer; font-family: inherit; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; border: 1.5px solid var(--border); background: #fff; color: var(--ink); padding: 10px 17px; border-radius: 12px; font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none; font-family: inherit; transition: transform .12s, box-shadow .12s, border-color .12s, background .12s; }
.btn:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 8px 20px -8px rgba(14,110,99,.55); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-accent, .btn-coral { background: var(--coral); border-color: var(--coral); color: #fff; box-shadow: 0 8px 20px -8px rgba(244,98,58,.55); }
.btn-accent:hover, .btn-coral:hover { background: var(--coral-dark); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--primary-soft); transform: none; }
.btn-lg { padding: 14px 26px; font-size: 16px; border-radius: 14px; }

/* ---------- Hero：工具即首屏 ---------- */
.hero { padding: 46px 0 64px; background:
  radial-gradient(720px 320px at 12% -8%, rgba(14,110,99,.10), transparent 62%),
  radial-gradient(640px 300px at 88% -12%, rgba(244,98,58,.08), transparent 60%),
  var(--paper); }
.hero-inner { max-width: 860px; }
.chips { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.chip { font-size: 12.5px; font-weight: 600; color: var(--primary-dark); background: var(--primary-soft); border: 1px solid rgba(14,110,99,.22); padding: 4px 12px; border-radius: 999px; }
.hero h1 { text-align: center; font-size: clamp(30px, 5.2vw, 50px); font-weight: 800; line-height: 1.12; margin-bottom: 14px; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero-sub { text-align: center; color: var(--muted); font-size: 17px; max-width: 640px; margin: 0 auto 30px; }
.hero-sub strong { color: var(--ink); }

.tool-card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 18px; box-shadow: var(--shadow-card); }
.drop-zone { border: 2px dashed rgba(14,110,99,.42); border-radius: 15px; padding: 54px 22px; text-align: center; cursor: pointer; transition: all .15s; background: linear-gradient(180deg, rgba(14,110,99,.035), transparent); }
.drop-zone:hover, .drop-zone.dragover { border-color: var(--primary); background: rgba(14,110,99,.06); transform: translateY(-1px); }
.drop-icon { font-size: 34px; font-weight: 800; color: var(--primary); font-family: var(--font-display); line-height: 1; margin-bottom: 10px; }
.drop-title { font-weight: 700; font-size: 16.5px; }
.drop-hint { color: var(--muted); font-size: 13px; margin-top: 6px; }
.sample-btn { display: block; margin: 12px auto 0; background: none; border: none; color: var(--primary); font-size: 13.5px; font-weight: 600; cursor: pointer; text-decoration: underline dotted; font-family: inherit; }
.sample-btn:hover { color: var(--primary-dark); }

/* ---------- 编辑器 ---------- */
.editor-toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 14px; }
.tb-group { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.tb-right { margin-left: auto; }
.select { padding: 10px 11px; border: 1.5px solid var(--border); border-radius: 12px; font-size: 14px; background: #fff; font-family: inherit; }
.brush-controls { display: inline-flex; align-items: center; gap: 8px; }
.brush-controls input[type=range] { width: 110px; accent-color: var(--primary); }
.status-bar { display: flex; align-items: center; gap: 10px; padding: 11px 15px; margin-bottom: 12px; background: var(--primary-soft); border-radius: 12px; color: var(--primary-dark); font-size: 14px; font-weight: 500; }
.spinner { width: 16px; height: 16px; border: 2.5px solid rgba(14,110,99,.25); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.canvas-box { display: flex; justify-content: center; background: repeating-conic-gradient(#eef0ea 0 25%, #fff 0 50%) 0 0 / 20px 20px; border-radius: 13px; overflow: hidden; min-height: 120px; }
.stack { position: relative; display: inline-block; max-width: 100%; }
.layer { max-width: 100%; max-height: 60vh; display: block; }
.layer-after { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
.layer-brush { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }
.layer-brush.hidden { display: none; }
.canvas-box.brushing .layer-brush { pointer-events: auto; cursor: crosshair; }
.compare-handle { position: absolute; top: 0; bottom: 0; width: 0; z-index: 5; }
.handle-line { position: absolute; top: 0; bottom: 0; left: -1.5px; width: 3px; background: rgba(255,255,255,.95); box-shadow: 0 0 8px rgba(0,0,0,.35); }
.handle-knob { position: absolute; top: 50%; left: 0; transform: translate(-50%, -50%); background: #fff; border-radius: 50%; padding: 7px 9px; font-size: 13px; box-shadow: var(--shadow-pop); }
.compare-bar { display: flex; align-items: center; gap: 12px; margin-top: 10px; color: var(--muted); font-size: 13px; }
.compare-bar input { flex: 1; accent-color: var(--primary); }
.result-meta { color: var(--muted); font-size: 13px; margin-top: 10px; min-height: 20px; text-align: center; }

/* ---------- 真实对比展示区 ---------- */
.section { padding: 64px 0; }
.section-tint { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.showcase { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.cmp { position: relative; border-radius: var(--radius); overflow: hidden; background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow-card); margin: 0; }
.cmp img { width: 100%; height: 172px; object-fit: cover; display: block; }
.cmp-clip { position: absolute; inset: 0; }
.cmp-clip img { height: 100%; }
.cmp-range { position: absolute; left: 12%; right: 12%; bottom: 46px; accent-color: var(--coral); z-index: 3; }
.cmp figcaption { display: flex; justify-content: space-between; padding: 9px 14px; font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--border); background: #fff; }
.cmp figcaption b { color: var(--ink); font-weight: 700; }

/* ---------- PPTX 推广带 ---------- */
.promo { background: linear-gradient(135deg, #0a3f39 0%, #0e6e63 100%); color: #f2f7f5; padding: 54px 0; }
.promo-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.promo h2 { text-align: left; color: #fff; margin-bottom: 8px; font-size: clamp(21px, 3vw, 30px); }
.promo p { opacity: .88; max-width: 560px; font-size: 15.5px; }
.promo-cta { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.promo-sample { color: #ffd9cb; font-size: 13.5px; text-decoration: underline dotted; }
.promo-sample:hover { color: #fff; }

/* ---------- 步骤 / 特性 ---------- */
.steps { counter-reset: step; }
.step { position: relative; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 24px 22px; box-shadow: var(--shadow-card); }
.step-num { font-family: var(--font-display); font-size: 46px; font-weight: 800; color: rgba(14,110,99,.16); line-height: 1; margin-bottom: 6px; }
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 14.5px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-card); transition: transform .15s, box-shadow .15s; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-pop); }
.card h3 { margin: 10px 0 6px; font-size: 16.5px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card-icon { font-size: 28px; }

/* ---------- FAQ ---------- */
.faq-item { background: var(--card); border: 1px solid var(--border); border-radius: 13px; padding: 15px 19px; margin-bottom: 10px; box-shadow: var(--shadow-card); }
.faq-item summary { font-weight: 700; cursor: pointer; font-size: 15.5px; }
.faq-item summary::marker { color: var(--coral); }
.faq-item summary:hover { color: var(--primary); }
.faq-item p { color: var(--muted); margin-top: 8px; font-size: 14.5px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: #cfd8d6; padding: 34px 0 30px; font-size: 13.5px; }
.site-footer .container { display: flex; flex-direction: column; gap: 9px; align-items: center; text-align: center; }
.footer-legal a { color: #9fb3af; text-decoration: none; margin: 0 10px; }
.footer-legal a:hover { color: #fff; }
.lang-links { font-size: 12.5px; }
.lang-links a { color: #9fb3af; text-decoration: none; }
.lang-links a:hover { color: #fff; }
.footer-copy { color: #7e8f8c; font-size: 12.5px; }

/* ---------- 落地页/法务页共用补充 ---------- */
.section .container { padding-inline: 22px; }
.legal-body h2 { font-size: 19px; text-align: left; margin: 24px 0 6px; }

/* ---------- 移动端 ---------- */
@media (max-width: 640px) {
  .hero { padding: 30px 0 48px; }
  .main-nav { display: none; }
  .layer { max-height: 44vh; }
  .cmp img, .cmp-clip img { height: 122px; }
  .cmp-range { bottom: 40px; }
  .promo-inner { flex-direction: column; align-items: flex-start; }
  .promo-cta { align-items: flex-start; }
  .editor-toolbar { gap: 8px; }
  .tb-right { margin-left: 0; }
  .grid-3 { gap: 12px; }
  .section { padding: 46px 0; }
}