/* ========== 快3D工坊 · 全局样式（工业蓝图 / 熔融沉积） ========== */

/* ---------- 主题色板 token（深色为默认值） ---------- */
:root {
  color-scheme: dark;
  /* 背景 / 卡片 */
  --tk-bg: #0c0f13;
  --tk-bg2: #11161d;
  --tk-card: #151b23;
  --tk-card-hi: #1a212b;
  --tk-card-hi2: #1e2630;
  /* 描边 */
  --tk-line: #242e39;
  --tk-line2: #2c3742;
  --tk-line3: #3a4555;
  /* 文字 */
  --tk-text: #e8edf2;
  --tk-text-2: #c9d2dc;
  --tk-text-3: #a8b0bd;
  --tk-muted: #8b97a4;
  --tk-faint: #5d6875;
  /* 主色 */
  --tk-accent: #ff6a1a;
  --tk-accent-hi: #ff8240;
  --tk-accent-soft2: #ffb066;
  --tk-accent-deep: #a85e28;
  --tk-accent-dim: #1a1105;
  /* 状态色 */
  --tk-green: #4ade80;
  --tk-green-lite: #86efac;
  --tk-green-deep: #059669;
  --tk-green-dim: #04250f;
  --tk-red: #f87171;
  --tk-red-lite: #fca5a5;
  --tk-red-deep: #dc2626;
  --tk-red-dim: #2a1a1a;
  --tk-red-dim2: #4a2828;
  --tk-amber: #fbbf24;
  --tk-amber-soft: #e8b95c;
  --tk-amber-deep: #d97706;
  --tk-amber-dim: #2a2418;
  --tk-amber-dim2: #4a3d22;
  --tk-blue: #93c5fd;
  --tk-blue-hi: #60a5fa;
  --tk-rose: #f43f5e;
  --tk-purple: #c4b5fd;
  --tk-purple-deep: #7c3aed;
  --tk-sky: #7dd3fc;
  --tk-sky-deep: #0369a1;
  --tk-cyan: #22d3ee;
  --tk-cyan-deep: #0e7490;
  --tk-slate: #94a3b8;
  --tk-warn-text: #f0a878;
  /* rgb 分量（供 rgba() 拼半透明色） */
  --tk-accent-rgb: 255,106,26;
  --tk-accent-hi-rgb: 255,130,64;
  --tk-green-rgb: 74,222,128;
  --tk-red-rgb: 248,113,113;
  --tk-blue-rgb: 96,165,250;
  --tk-amber-rgb: 251,191,36;
  --tk-rose-rgb: 244,63,94;
  --tk-purple-rgb: 167,139,250;
  --tk-orange-rgb: 251,146,60;
  --tk-slate-rgb: 148,163,184;
  --tk-faint-rgb: 93,104,117;
  --tk-grid-rgb: 255,255,255;
  --tk-surface-rgb: 16,21,29;
  --tk-panel-rgb: 12,15,19;
}

/* ---------- 亮色主题覆盖 ---------- */
html[data-theme="light"] {
  color-scheme: light;
  --tk-bg: #f3f5f9;
  --tk-bg2: #ffffff;
  --tk-card: #ffffff;
  --tk-card-hi: #f6f8fb;
  --tk-card-hi2: #eef1f6;
  --tk-line: #e4e8ef;
  --tk-line2: #d3dae3;
  --tk-line3: #c2cbd7;
  --tk-text: #1b2430;
  --tk-text-2: #33404f;
  --tk-text-3: #4c5967;
  --tk-muted: #5e6b79;
  --tk-faint: #7d8a98;
  --tk-accent: #f2600c;
  --tk-accent-hi: #d95f0d;
  --tk-accent-soft2: #e0651a;
  --tk-accent-deep: #8a4a1c;
  --tk-accent-dim: #fff3e8;
  --tk-green: #16a34a;
  --tk-green-lite: #15803d;
  --tk-green-deep: #047857;
  --tk-green-dim: #e7f8ef;
  --tk-red: #dc2626;
  --tk-red-lite: #b91c1c;
  --tk-red-deep: #b91c1c;
  --tk-red-dim: #fdecec;
  --tk-red-dim2: #f8d7d7;
  --tk-amber: #b45309;
  --tk-amber-soft: #a16207;
  --tk-amber-deep: #b45309;
  --tk-amber-dim: #fdf3e0;
  --tk-amber-dim2: #f7e6c8;
  --tk-blue: #2563eb;
  --tk-blue-hi: #1d4ed8;
  --tk-rose: #e11d48;
  --tk-purple: #7c3aed;
  --tk-purple-deep: #6d28d9;
  --tk-sky: #0284c7;
  --tk-sky-deep: #075985;
  --tk-cyan: #0891b2;
  --tk-cyan-deep: #155e75;
  --tk-slate: #64748b;
  --tk-warn-text: #b45309;
  --tk-accent-rgb: 242,96,12;
  --tk-accent-hi-rgb: 234,106,16;
  --tk-green-rgb: 22,163,74;
  --tk-red-rgb: 220,38,38;
  --tk-blue-rgb: 37,99,235;
  --tk-amber-rgb: 180,83,9;
  --tk-rose-rgb: 225,29,72;
  --tk-purple-rgb: 124,58,237;
  --tk-orange-rgb: 234,88,12;
  --tk-slate-rgb: 100,116,139;
  --tk-faint-rgb: 125,138,152;
  --tk-grid-rgb: 15,23,42;
  --tk-surface-rgb: 255,255,255;
  --tk-panel-rgb: 255,255,255;
}

:root {
  --bg: var(--tk-bg);
  --bg-2: var(--tk-bg2);
  --card: var(--tk-card);
  --card-hi: var(--tk-card-hi);
  --line: var(--tk-line);
  --line-hi: var(--tk-line3);
  --text: var(--tk-text);
  --muted: var(--tk-muted);
  --faint: var(--tk-faint);
  --accent: var(--tk-accent);
  --accent-hi: var(--tk-accent-hi);
  --accent-soft: rgba(var(--tk-accent-rgb),.12);
  --ok: var(--tk-green);
  --radius: 12px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #fff; }

/* 蓝图网格底纹 */
.blueprint {
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(var(--tk-grid-rgb),.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--tk-grid-rgb),.025) 1px, transparent 1px);
  background-size: 44px 44px;
}

/* ========== 顶栏 ========== */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(var(--tk-panel-rgb),.82);
  backdrop-filter: blur(14px);
}
/* 触屏设备（平板/手机）：粘性顶栏的 backdrop-filter 会持续整屏重绘，滚动明显掉帧，故关闭 */
@media (pointer: coarse), (max-width: 900px) {
  .nav { backdrop-filter: none; -webkit-backdrop-filter: none; background: rgba(var(--tk-panel-rgb),.96); }
}
.nav-inner {
  max-width: none; margin: 0 auto;
  padding: 0 24px; height: 64px;
  display: flex; align-items: center; gap: 28px;
}
/* 品牌区不参与收缩：窄屏时若被挤压，中文会逐字换行变成「竖排」 */
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .04em; flex: 0 0 auto; white-space: nowrap; }
.logo span, .logo small { white-space: nowrap; flex: 0 0 auto; }
.logo-img { height: 40px; width: auto; display: block; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--tk-accent-deep));
  display: grid; place-items: center;
  box-shadow: 0 4px 18px rgba(var(--tk-accent-rgb),.35);
}
.logo-mark svg { width: 17px; height: 17px; }
.logo small { display: block; font-size: 10px; font-weight: 600; letter-spacing: .28em; color: var(--faint); font-family: var(--mono); }
.nav-links { display: flex; gap: 26px; margin-left: 8px; }
.nav-links a { color: var(--muted); font-size: 14px; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-spacer { flex: 1; }
.nav-user { display: flex; align-items: center; gap: 12px; }

/* ========== 主题切换按钮（桌面端顶栏图标；手机端收进抽屉） ========== */
.theme-btn {
  width: auto; margin: 0; padding: 8px; flex: 0 0 auto;
  display: inline-flex; align-items: center; justify-content: center;
  background: none; border: 1px solid var(--tk-line3); border-radius: 9px;
  color: var(--tk-text-2); cursor: pointer; font-family: inherit;
  transition: border-color .2s, color .2s;
}
.theme-btn:hover { border-color: var(--accent); color: var(--accent-hi); }
.theme-btn svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; pointer-events: none; }
@media (max-width: 900px) { .theme-btn { display: none !important; } }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 9px;
  font-size: 14px; font-weight: 700; font-family: var(--sans);
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s, background .2s, border-color .2s, box-shadow .2s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent-hi), var(--accent));
  color: #fff;
  box-shadow: 0 6px 22px rgba(var(--tk-accent-rgb),.28);
}
.btn-primary:hover { box-shadow: 0 8px 30px rgba(var(--tk-accent-rgb),.45); transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--text);
  border-color: var(--line-hi);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-hi); }
.btn-lg { padding: 14px 30px; font-size: 15px; border-radius: 11px; }
.btn-block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

.username-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border: 1px solid var(--line); border-radius: 999px;
  font-size: 13px; color: var(--text); transition: border-color .2s;
}
.username-chip:hover { border-color: var(--line-hi); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.dot.member { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
/* 顶栏头像：固定尺寸圆形，避免原图按固有尺寸撑爆导航 */
.nav-avatar { width: 22px; height: 22px; border-radius: 50%; object-fit: cover; display: inline-block; flex: 0 0 auto; background: var(--faint); }
.nav-avatar.ph { display: inline-flex; align-items: center; justify-content: center; background: var(--accent); color: #111; font-size: 12px; font-weight: 600; text-transform: uppercase; }

/* ========== Hero ========== */
.hero {
  max-width: none; margin: 0 auto;
  padding: 96px 24px 80px;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .14em;
  color: var(--accent-hi); text-transform: uppercase;
  border: 1px solid rgba(var(--tk-accent-rgb),.3);
  background: var(--accent-soft);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 24px;
}
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: blink 1.6s infinite; }
@keyframes blink { 50% { opacity: .25; } }
.hero h1 {
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.18; font-weight: 850; letter-spacing: -.01em;
}
.hero h1 em {
  font-style: normal; color: var(--accent);
  position: relative;
}
.hero p.lead { margin: 22px 0 34px; font-size: 17px; color: var(--muted); max-width: 480px; }
.hero-cta { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 13px; color: var(--faint); }

/* Hero 右侧 3D 方块装饰 */
.stage {
  position: relative; aspect-ratio: 1; max-width: 440px; margin-left: auto; width: 100%;
  perspective: 900px;
}
.cube-wrap {
  position: absolute; inset: 12%;
  transform-style: preserve-3d;
  animation: spin 22s linear infinite;
}
@keyframes spin {
  from { transform: rotateX(-22deg) rotateY(0deg); }
  to { transform: rotateX(-22deg) rotateY(360deg); }
}
.cube { position: absolute; inset: 0; transform-style: preserve-3d; }
.face {
  position: absolute; inset: 0;
  border: 1.5px solid rgba(var(--tk-accent-rgb),.55);
  background:
    linear-gradient(rgba(var(--tk-accent-rgb),.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--tk-accent-rgb),.10) 1px, transparent 1px),
    rgba(var(--tk-accent-rgb),.03);
  background-size: 32px 32px;
  box-shadow: inset 0 0 60px rgba(var(--tk-accent-rgb),.08);
}
.face.front  { transform: translateZ(150px); }
.face.back   { transform: rotateY(180deg) translateZ(150px); }
.face.right  { transform: rotateY(90deg) translateZ(150px); }
.face.left   { transform: rotateY(-90deg) translateZ(150px); }
.face.top    { transform: rotateX(90deg) translateZ(150px); }
.face.bottom { transform: rotateX(-90deg) translateZ(150px); }
.scan {
  position: absolute; left: 8%; right: 8%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-hi), transparent);
  filter: blur(.5px);
  animation: scan 3.4s ease-in-out infinite;
  opacity: .8;
}
@keyframes scan {
  0%, 100% { top: 14%; opacity: 0; }
  15%, 85% { opacity: 1; }
  50% { top: 84%; }
}
.ring {
  position: absolute; border-radius: 50%;
  border: 1px dashed var(--line-hi);
}
.ring.r1 { inset: 0; animation: spin 40s linear infinite reverse; }
.ring.r2 { inset: 10%; border-color: rgba(var(--tk-grid-rgb),.08); }
.tag-3d {
  position: absolute; font-family: var(--mono); font-size: 11px; color: var(--muted);
  background: var(--card); border: 1px solid var(--line);
  padding: 6px 12px; border-radius: 8px;
}
.tag-3d.t1 { top: 6%; left: -4%; }
.tag-3d.t2 { bottom: 10%; right: -2%; color: var(--accent-hi); border-color: rgba(var(--tk-accent-rgb),.35); }

/* ========== 通用区块 ========== */
.section { max-width: none; margin: 0 auto; padding: 80px 24px; }
.section-head { text-align: center; margin-bottom: 52px; }
.section-head .kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: .22em;
  color: var(--accent); text-transform: uppercase;
}
.section-head h2 { font-size: clamp(26px, 3vw, 36px); font-weight: 800; margin: 12px 0 14px; }
.section-head p { color: var(--muted); max-width: 560px; margin: 0 auto; }

.grid-4 { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); gap: 22px; }

.feature {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 24px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.feature:hover {
  transform: translateY(-4px); border-color: rgba(var(--tk-accent-rgb),.45);
  box-shadow: 0 16px 40px rgba(0,0,0,.35);
}
.feature .ico {
  width: 44px; height: 44px; border-radius: 10px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: var(--accent-soft); color: var(--accent-hi);
  border: 1px solid rgba(var(--tk-accent-rgb),.25);
}
.feature .ico svg { width: 22px; height: 22px; }
.feature h3 { font-size: 17px; margin-bottom: 8px; font-weight: 750; }

.feature p { font-size: 14px; color: var(--muted); }

/* 工具卡片 */
.tool-card {
  display: block;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 28px;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.tool-card:hover {
  transform: translateY(-4px); border-color: rgba(var(--tk-accent-rgb),.45);
  box-shadow: 0 16px 40px rgba(0,0,0,.35);
}
.tool-card .tool-ico {
  width: 52px; height: 52px; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 20px;
  background: var(--accent-soft); color: var(--accent-hi);
  border: 1px solid rgba(var(--tk-accent-rgb),.25);
}
.tool-card .tool-ico svg { width: 26px; height: 26px; }
.tool-card h3 { font-size: 19px; margin-bottom: 10px; font-weight: 750; }
.tool-card p { font-size: 14px; color: var(--muted); margin-bottom: 18px; line-height: 1.6; }
.tool-card .tool-cta {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 700; color: var(--accent-hi);
  transition: gap .2s;
}
.tool-card:hover .tool-cta { gap: 10px; }

/* 流程步骤 */
.steps { counter-reset: step; }
.step {
  position: relative;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 26px;
}
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-family: var(--mono); font-size: 30px; font-weight: 800;
  color: transparent; -webkit-text-stroke: 1.5px var(--line-hi);
  display: block; margin-bottom: 14px;
}
.step h3 { font-size: 17px; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--muted); }
.step:not(:last-child)::after {
  content: "→"; position: absolute; right: -19px; top: 50%;
  transform: translateY(-50%); color: var(--accent); font-size: 20px; z-index: 2;
}

/* 底部 CTA */
.cta-band {
  margin: 40px auto 90px; max-width: none;
  border: 1px solid rgba(var(--tk-accent-rgb),.3);
  border-radius: 18px; padding: 56px 40px; text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(var(--tk-accent-rgb),.14), transparent 65%),
    var(--bg-2);
}
.cta-band h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 850; margin-bottom: 12px; }
.cta-band p { color: var(--muted); margin-bottom: 28px; }

footer {
  border-top: 1px solid var(--line);
  padding: 30px 24px; text-align: center;
  color: var(--faint); font-size: 13px;
}
footer .disclaimer {
  max-width: 760px; margin: 12px auto 0; font-size: 12px; line-height: 1.7;
  color: var(--faint); opacity: 0.8;
}
footer .disclaimer b { color: var(--text); }

/* ========== 认证页 / 用户中心 ========== */
.auth-wrap { min-height: calc(100vh - 64px); display: grid; place-items: center; padding: 48px 24px; }
.auth-card {
  width: 100%; max-width: 410px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 36px 34px;
}
.auth-card h1 { font-size: 24px; font-weight: 800; margin-bottom: 6px; }
.auth-card .sub { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.tabs { display: flex; background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 4px; margin-bottom: 24px; }
.tabs a {
  flex: 1; text-align: center; padding: 9px 0; border-radius: 7px;
  font-size: 14px; font-weight: 700; color: var(--muted);
}
.tabs a.active { background: var(--card-hi); color: var(--text); box-shadow: 0 2px 8px rgba(0,0,0,.25); }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 7px; font-weight: 600; }
.field input {
  width: 100%; padding: 12px 14px;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: 9px; color: var(--text); font-size: 15px; font-family: var(--sans);
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-error {
  display: none; background: rgba(var(--tk-red-rgb),.1); border: 1px solid rgba(var(--tk-red-rgb),.35);
  color: var(--tk-red-lite); font-size: 13px; padding: 10px 14px; border-radius: 9px; margin-bottom: 16px;
}
.form-error.show { display: block; }
.auth-foot { text-align: center; margin-top: 22px; font-size: 13px; color: var(--faint); }
.auth-foot a { color: var(--accent-hi); font-weight: 600; }

/* 用户中心 */
.panel {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 32px;
}
.panel + .panel { margin-top: 18px; }
.panel h2 { font-size: 18px; margin-bottom: 20px; }
.kv { display: flex; justify-content: space-between; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.kv:last-child { border-bottom: none; }
.kv .k { color: var(--muted); }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 999px;
}
.badge.free { background: rgba(var(--tk-grid-rgb),.06); color: var(--muted); }
.badge.vip { background: var(--accent-soft); color: var(--accent-hi); border: 1px solid rgba(var(--tk-accent-rgb),.3); }

/* 图片预览 lightbox */
.img-lightbox{position:fixed;inset:0;background:rgba(0,0,0,.92);display:none;align-items:center;justify-content:center;z-index:9999;padding:24px;cursor:zoom-out}
.img-lightbox.show{display:flex}
.img-lightbox img{max-width:100%;max-height:100%;object-fit:contain;border-radius:8px;box-shadow:0 8px 40px rgba(0,0,0,.6)}
.img-lightbox .lb-close{position:absolute;top:14px;right:22px;color:#fff;font-size:36px;background:none;border:none;cursor:pointer;line-height:1;padding:4px 8px}
.img-lightbox .lb-tip{position:absolute;bottom:14px;left:0;right:0;text-align:center;color:var(--tk-faint);font-size:12px}

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(22px); animation: reveal .7s cubic-bezier(.2,.7,.3,1) forwards; }
.reveal.d1 { animation-delay: .08s; }
.reveal.d2 { animation-delay: .16s; }
.reveal.d3 { animation-delay: .24s; }
@keyframes reveal { to { opacity: 1; transform: none; } }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding: 56px 20px 48px; gap: 0; }
  .hero p.lead { max-width: none; }
  .stage { display: none; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .step:not(:last-child)::after { display: none; }
  .nav-links { display: none; }
  .nav-inner { padding: 0 16px; gap: 12px; }
  .section { padding: 52px 20px; }
  .section-head { margin-bottom: 34px; }
  .panel { padding: 22px 18px; }
  .cta-band { margin: 20px auto 60px; padding: 40px 22px; }
  .username-chip { max-width: 150px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
}

@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr; }
  .hero { padding: 44px 16px 40px; }
  .hero-cta .btn { flex: 1; justify-content: center; }
  .btn-lg { padding: 13px 20px; font-size: 14px; }
  .section { padding: 44px 16px; }
  .auth-card { padding: 28px 22px; }
  .logo span { font-size: 17px !important; }
  .logo-img { height: 32px; }
  .nav-inner { height: 56px; padding: 0 12px; }
  /* 品牌区已固定不收缩，登录区改为紧凑按钮，避免整条导航横向溢出 */
  .nav-user { flex: 1 1 auto; min-width: 0; justify-content: flex-end; gap: 8px; }
  .nav-user .btn { padding: 8px 12px; font-size: 13px; }
  footer { padding: 22px 16px; font-size: 12px; }
}

/* fullscreen-x-guard（用 clip 避免 html 变成滚动容器、进而出现第二条滚动条） */
html { overflow-x: hidden; overflow-x: clip; }
/* 隐藏页面滚动条（滚动能力保留：滚轮 / 触控 / 键盘仍可滚动） */
html, body { scrollbar-width: none; -ms-overflow-style: none; }
html::-webkit-scrollbar, body::-webkit-scrollbar { width: 0; height: 0; display: none; }