/* 随手 AI · 液态玻璃官网
   纯静态 · 零外部依赖 · 自动深色 · 弹簧物理动效 */

:root {
  /* 光斑配色（与 App 的玻璃背景同源） */
  --b1: #a98cff;
  --b2: #6fd3ff;
  --b3: #ffb3d9;
  --paper: #f6f3ff;
  --paper-2: #eef5ff;

  --fg: #17151f;
  --fg-dim: #5c5a6b;
  --glass: rgba(255, 255, 255, 0.55);
  --glass-strong: rgba(255, 255, 255, 0.72);
  --glass-line: rgba(255, 255, 255, 0.9);
  --glass-edge: rgba(255, 255, 255, 0.65);
  --shadow: 0 24px 60px -28px rgba(52, 26, 120, 0.45);
  --shadow-soft: 0 12px 30px -18px rgba(52, 26, 120, 0.35);

  --brand: #6a3ff0;
  --brand-2: #27b4ff;
  --radius: 26px;
  --maxw: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --b1: #5b3ad6;
    --b2: #0f7fd0;
    --b3: #a3306f;
    --paper: #08070e;
    --paper-2: #0b0f1a;

    --fg: #f1eff8;
    --fg-dim: #a6a3b8;
    --glass: rgba(255, 255, 255, 0.07);
    --glass-strong: rgba(255, 255, 255, 0.11);
    --glass-line: rgba(255, 255, 255, 0.16);
    --glass-edge: rgba(255, 255, 255, 0.22);
    --shadow: 0 30px 70px -30px rgba(0, 0, 0, 0.9);
    --shadow-soft: 0 14px 36px -20px rgba(0, 0, 0, 0.8);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100%;
  color: var(--fg);
  background:
    radial-gradient(120% 90% at 15% 0%, color-mix(in srgb, var(--b1) 22%, var(--paper)) 0%, transparent 55%),
    radial-gradient(100% 80% at 90% 12%, color-mix(in srgb, var(--b2) 20%, var(--paper)) 0%, transparent 55%),
    radial-gradient(110% 80% at 50% 100%, color-mix(in srgb, var(--b3) 18%, var(--paper)) 0%, transparent 60%),
    linear-gradient(160deg, var(--paper), var(--paper-2));
  background-attachment: fixed;
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* ---------- 背景光斑（真正会动的液态玻璃底） ---------- */
/* 关键：容器不向外撑。用 overflow:clip + 100% 尺寸，光斑在内部被裁，
   避免负 inset 把文档宽度撑破（曾导致移动端整页右偏） */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  opacity: .6;
  pointer-events: none;
}
.blob {
  position: absolute;
  display: block;
  border-radius: 50%;
  /* 模糊放在子元素上：父级只要带 filter，fixed 会退化为相对定位并撑宽文档 */
  filter: blur(72px) saturate(140%);
  will-change: transform;
}
.b1 {
  width: 44vw; height: 44vw; left: -6vw; top: 0;
  background: radial-gradient(circle at 40% 40%, var(--b1), transparent 66%);
  animation: drift1 26s ease-in-out infinite alternate;
}
.b2 {
  width: 40vw; height: 40vw; right: -5vw; top: 16vh;
  background: radial-gradient(circle at 60% 40%, var(--b2), transparent 66%);
  animation: drift2 31s ease-in-out infinite alternate;
}
.b3 {
  width: 36vw; height: 36vw; left: 34vw; top: 58vh;
  background: radial-gradient(circle at 50% 50%, var(--b3), transparent 66%);
  animation: drift3 23s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate3d(6vw, 6vh, 0) scale(1.08); } }
@keyframes drift2 { to { transform: translate3d(-7vw, 9vh, 0) scale(1.12); } }
@keyframes drift3 { to { transform: translate3d(4vw, -8vh, 0) scale(0.94); } }

/* ---------- 通用玻璃卡片 ---------- */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 1px 0 var(--glass-edge);
  backdrop-filter: blur(22px) saturate(170%);
  -webkit-backdrop-filter: blur(22px) saturate(170%);
}

/* ---------- 顶栏（黏性玻璃条） ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px max(20px, calc((100vw - var(--maxw)) / 2 + 20px));
  background: color-mix(in srgb, var(--paper) 55%, transparent);
  border-bottom: 1px solid var(--glass-line);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
}
/* 顶栏吸附时给一点「凝聚」感 */
@supports (animation-timeline: scroll()) {
  .topbar {
    animation: condense linear both;
    animation-timeline: scroll(root);
    animation-range: 0 240px;
  }
  @keyframes condense {
    from { box-shadow: 0 0 0 0 rgba(0,0,0,0); }
    to   { box-shadow: 0 10px 30px -22px rgba(30, 16, 70, .7); }
  }
}

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.logo {
  display: grid; place-items: center;
  width: 32px; height: 32px;
  border-radius: 11px;
  color: #fff;
  font-size: 15px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 10px 22px -10px var(--brand), inset 0 1px 0 rgba(255,255,255,.5);
}

.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  padding: 8px 12px;
  font-size: 14.5px;
  color: var(--fg-dim);
  border-radius: 999px;
  transition: color .18s, background .18s;
}
.nav-links a:hover { color: var(--fg); background: var(--glass); }
@media (max-width: 780px) { .nav-links a:not(.btn) { display: none; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
  /* 弹簧感的过渡：回弹用 cubic-bezier 过冲 */
  transition: transform .24s cubic-bezier(.2, 1.2, .3, 1.5), box-shadow .24s ease, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(.97); }

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 16px 34px -14px var(--brand), inset 0 1px 0 rgba(255,255,255,.45);
}
.btn-primary:hover { box-shadow: 0 22px 44px -14px var(--brand), inset 0 1px 0 rgba(255,255,255,.55); }

.btn-glass {
  color: var(--fg);
  background: var(--glass-strong);
  border-color: var(--glass-line);
  box-shadow: var(--shadow-soft), inset 0 1px 0 var(--glass-edge);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
}

/* ---------- 布局 ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0 16px; }

.section-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.section-head h2 { margin: 0; font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -.02em; }
.tag {
  padding: 4px 11px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--fg-dim);
  border-radius: 999px;
  border: 1px solid var(--glass-line);
  background: var(--glass);
}
.section-sub { margin: 4px 0 30px; color: var(--fg-dim); }

/* ---------- HERO ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
  gap: 44px;
  align-items: center;
  padding: 64px 0 28px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--fg-dim);
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  box-shadow: var(--shadow-soft);
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #37d67a;
  box-shadow: 0 0 0 3px color-mix(in srgb, #37d67a 25%, transparent);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 5.2vw, 56px);
  line-height: 1.1;
  letter-spacing: -.025em;
}
.grad {
  background: linear-gradient(112deg, var(--brand), var(--brand-2) 55%, #ff7fc0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lead { margin: 0 0 26px; max-width: 30em; color: var(--fg-dim); font-size: 17px; }

/* 中英混排时，长英文串（API Key、URL、模型名）不会断，容易撑破窄屏 */
.hero-copy, .hero-copy p, .hero-copy li { min-width: 0; overflow-wrap: break-word; word-break: normal; }
.hero-copy .lead { overflow-wrap: anywhere; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.meta-line { margin: 0; font-size: 13px; color: var(--fg-dim); }

.pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 0; padding: 0; list-style: none; }
.pills li {
  padding: 6px 13px;
  font-size: 13px;
  color: var(--fg-dim);
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
}

/* ---------- 手机舞台 ---------- */
.stage {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-width: 0;
  perspective: 1600px;
  /* 外层放大后可能出框，裁掉，避免撑宽移动端 */
  overflow: hidden;
  padding: 10px 14px;
}
.stage-inner { position: relative; width: min(316px, 100%); }

.phone {
  position: relative;
  margin: 0;
  padding: 9px;
  border-radius: 40px;
  background: linear-gradient(155deg, rgba(255,255,255,.78), rgba(255,255,255,.22));
  border: 1px solid rgba(255,255,255,.55);
  box-shadow:
    0 40px 90px -34px rgba(40, 18, 100, .55),
    0 8px 24px -12px rgba(40, 18, 100, .35),
    inset 0 1px 0 rgba(255,255,255,.9);
  transform: rotate(-4deg);
  transition: transform .7s cubic-bezier(.2, .9, .2, 1);
}
.phone img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 32px;
}
.phone-back {
  position: absolute;
  right: 1%;
  top: 12%;
  width: 55%;
  padding: 7px;
  z-index: -1;
  opacity: .95;
  transform: rotate(7deg) translateY(18px);
}
.phone-back img { border-radius: 26px; }
.stage:hover .phone { transform: rotate(-2.5deg) translateY(-6px); }

.stage-note {
  position: absolute;
  left: -8px;
  bottom: 6%;
  padding: 6px 13px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--fg);
  border-radius: 999px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-line);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr); padding-top: 36px; gap: 30px; }
  .phone-back, .stage-note { display: none; }
  .stage-inner { width: min(320px, 92%); }
  .phone { transform: rotate(0); }
}

/* 窄屏：横向裁剪的来源是这些长串（URL、代码、长英文），让它们自己换行 */
@media (max-width: 720px) {
  .copybar { flex-wrap: wrap; }
  .copybar code {
    flex: 1 1 100%;
    white-space: normal;
    word-break: break-all;
    overflow-x: visible;
  }
  .copybar .copy-hint, .copybar .label { flex: 0 0 auto; }
  code.inline { word-break: break-all; }
  .kbd { word-break: break-all; }
}

/* ---------- 更新源复制条 ---------- */
.copybar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 18px;
  margin: 34px 0 6px;
  border-radius: 20px;
}
.copybar .label { font-size: 12.5px; letter-spacing: .08em; color: var(--fg-dim); }
.copybar code {
  flex: 1 1 260px;
  min-width: 0;
  padding: 8px 12px;
  font: 13px/1.5 ui-monospace, "Cascadia Mono", Consolas, monospace;
  border-radius: 12px;
  background: color-mix(in srgb, var(--paper) 60%, transparent);
  border: 1px solid var(--glass-line);
  overflow-x: auto;
  white-space: nowrap;
}
.copy-hint { font-size: 12.5px; color: var(--fg-dim); }
.copy-hint.ok { color: #1e9e52; font-weight: 700; }
@media (prefers-color-scheme: dark) { .copy-hint.ok { color: #56e08b; } }

/* ---------- 功能卡片 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 252px), 1fr));
  gap: 18px;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-line);
  box-shadow: var(--shadow-soft), inset 0 1px 0 var(--glass-edge);
  backdrop-filter: blur(20px) saturate(165%);
  -webkit-backdrop-filter: blur(20px) saturate(165%);
  transition: transform .28s cubic-bezier(.2, 1.1, .3, 1.4), box-shadow .28s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow), inset 0 1px 0 var(--glass-edge);
}
.card-top { display: flex; align-items: center; gap: 12px; }
.chip {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  flex: 0 0 auto;
  border-radius: 13px;
  font-size: 19px;
  color: #fff;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.5), 0 10px 22px -12px currentColor;
}
.c1 { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
.c2 { background: linear-gradient(135deg, #38bdf8, #0e7490); }
.c3 { background: linear-gradient(135deg, #fb7185, #be123c); }
.c4 { background: linear-gradient(135deg, #34d399, #047857); }
.c5 { background: linear-gradient(135deg, #fbbf24, #b45309); }
.c6 { background: linear-gradient(135deg, #818cf8, #3730a3); }
.c7 { background: linear-gradient(135deg, #f472b6, #9d174d); }
.c8 { background: linear-gradient(135deg, #2dd4bf, #115e59); }

.card h3 { margin: 0; font-size: 16.5px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--fg-dim); font-size: 14.6px; }
.card .kbd {
  margin-top: auto;
  align-self: flex-start;
  padding: 3px 9px;
  font: 11.5px/1.5 ui-monospace, Consolas, monospace;
  color: var(--fg-dim);
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper) 55%, transparent);
  border: 1px solid var(--glass-line);
}

/* ---------- 截图墙 ---------- */
.wall {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 8px 2px 28px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
.wall figure { flex: 0 0 auto; width: clamp(176px, 26vw, 238px); margin: 0; scroll-snap-align: center; }
.wall .shot {
  padding: 7px;
  border-radius: 30px;
  background: linear-gradient(155deg, rgba(255,255,255,.62), rgba(255,255,255,.16));
  border: 1px solid rgba(255,255,255,.55);
  box-shadow: 0 26px 60px -30px rgba(40, 18, 100, .5), inset 0 1px 0 rgba(255,255,255,.85);
  transition: transform .3s cubic-bezier(.2, 1.1, .3, 1.4);
}
.wall img { display: block; width: 100%; height: auto; border-radius: 24px; }
.wall figure:hover .shot { transform: translateY(-5px) scale(1.012); }
.wall figcaption { margin-top: 12px; text-align: center; font-size: 13.5px; color: var(--fg-dim); }
.wall::-webkit-scrollbar { height: 8px; }
.wall::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--fg-dim) 35%, transparent);
  border-radius: 99px;
}

/* ---------- 步骤 ---------- */
.steps {
  list-style: none;
  counter-reset: s;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 18px;
}
.steps li {
  counter-increment: s;
  position: relative;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-line);
  box-shadow: var(--shadow-soft), inset 0 1px 0 var(--glass-edge);
  backdrop-filter: blur(20px) saturate(165%);
  -webkit-backdrop-filter: blur(20px) saturate(165%);
}
.steps li::before {
  content: counter(s);
  display: grid; place-items: center;
  width: 32px; height: 32px;
  margin-bottom: 12px;
  border-radius: 11px;
  font-size: 14px; font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 10px 22px -12px var(--brand), inset 0 1px 0 rgba(255,255,255,.5);
}
.steps h3 { margin: 0 0 6px; font-size: 16.5px; }
.steps p { margin: 0; color: var(--fg-dim); font-size: 14.6px; }

.note {
  padding: 16px 20px;
  font-size: 14.2px;
  color: var(--fg-dim);
  border-radius: 18px;
  background: var(--glass);
  border: 1px dashed color-mix(in srgb, var(--brand) 40%, var(--glass-line));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.note strong { color: var(--fg); }

code.inline {
  padding: 2px 8px;
  font: 13px/1.5 ui-monospace, Consolas, monospace;
  border-radius: 8px;
  color: color-mix(in srgb, var(--brand) 85%, var(--fg));
  background: color-mix(in srgb, var(--brand) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--brand) 22%, transparent);
  word-break: break-all;
}

/* ---------- 开源 ---------- */
.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 18px;
  margin-bottom: 24px;
}
.list { margin: 0; padding: 0; list-style: none; }
.list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 9px;
  color: var(--fg-dim);
  font-size: 14.6px;
}
.list li::before {
  content: "";
  position: absolute;
  left: 6px; top: .62em;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #37d67a;
  box-shadow: 0 0 0 3px color-mix(in srgb, #37d67a 22%, transparent);
}
.list li.warn::before {
  background: #ff7a59;
  box-shadow: 0 0 0 3px color-mix(in srgb, #ff7a59 22%, transparent);
}
.link-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- 打赏 · Vibe 知识大赏风格 ----------
   深蓝黑 #0A0A1E + 金色 #C9A96A，五区布局：
   顶标签 / 中央动画 / 注释带 / 双语字幕带 / 水印
   全程有声画的"在动"感：胶片颗粒 + 扫描线 + 时间码走字 */
.vk-wrap { position: relative; }

.vk-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  min-height: 340px;
  overflow: hidden;
  border-radius: 20px;
  background:
    radial-gradient(120% 90% at 50% 0%, #141433 0%, transparent 60%),
    #0a0a1e;
  color: #ece7db;
  border: 1px solid rgba(201, 169, 106, .28);
  box-shadow:
    0 50px 100px -50px rgba(0, 0, 0, .95),
    inset 0 0 0 1px rgba(255, 255, 255, .035);
  font-family: ui-monospace, "Cascadia Mono", Consolas, "PingFang SC", monospace;
  isolation: isolate;
}

/* 胶片颗粒：SVG 湍流做噪点，位移制造"呼吸" */
.vk-frame::before {
  content: "";
  position: absolute;
  inset: -50%;
  z-index: 4;
  pointer-events: none;
  opacity: .16;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: vk-grain 1.1s steps(3) infinite;
}
@keyframes vk-grain {
  0%   { transform: translate3d(0, 0, 0); }
  33%  { transform: translate3d(-6px, 4px, 0); }
  66%  { transform: translate3d(5px, -5px, 0); }
  100% { transform: translate3d(-3px, -2px, 0); }
}

/* 扫描线 */
.vk-frame::after {
  content: "";
  position: absolute;
  left: 0; right: 0; height: 34%;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(201, 169, 106, .05) 45%, transparent);
  animation: vk-scan 7.5s linear infinite;
}
@keyframes vk-scan {
  0%   { top: -34%; }
  100% { top: 100%; }
}

/* 四角取景框 */
.vk-corners { position: absolute; inset: 12px; z-index: 5; pointer-events: none; }
.vk-corners i {
  position: absolute; width: 14px; height: 14px;
  border: 1px solid rgba(201, 169, 106, .55);
}
.vk-corners i:nth-child(1) { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.vk-corners i:nth-child(2) { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.vk-corners i:nth-child(3) { bottom: 0; left: 0; border-right: 0; border-top: 0; }
.vk-corners i:nth-child(4) { bottom: 0; right: 0; border-left: 0; border-top: 0; }

/* 顶标签带 */
.vk-hud {
  position: absolute;
  top: 22px; left: 28px; right: 28px;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(236, 231, 219, .62);
}
.vk-ep { display: inline-flex; align-items: center; gap: 9px; }
.vk-ep b {
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: #c9a96a;
  box-shadow: 0 0 10px #c9a96a;
  animation: vk-blink 2.4s ease-in-out infinite;
}
@keyframes vk-blink { 50% { opacity: .25; } }
.vk-tc { font-variant-numeric: tabular-nums; color: rgba(201, 169, 106, .85); }

/* 中央舞台 */
.vk-stage {
  position: absolute;
  inset: 58px 28px 96px;
  z-index: 2;
  display: grid;
  place-items: center;
  text-align: center;
}
.vk-scene {
  grid-area: 1 / 1;
  width: 100%;
  opacity: 0;
  transform: translateY(10px) scale(.99);
  transition: opacity .5s ease, transform .6s cubic-bezier(.2, 1.1, .3, 1.2);
  pointer-events: none;
}
.vk-scene.on { opacity: 1; transform: none; pointer-events: auto; }

.vk-kicker {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: rgba(201, 169, 106, .9);
}
.vk-title {
  margin: 0 0 14px;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.12;
  letter-spacing: -.01em;
  font-weight: 800;
}
.vk-title em {
  font-style: normal;
  color: #c9a96a;
  position: relative;
  white-space: nowrap;
}
.vk-title em::after {
  content: "";
  position: absolute;
  left: -2px; right: -2px; bottom: -.12em;
  height: .5em;
  background: linear-gradient(90deg, rgba(201,169,106,.35), rgba(201,169,106,.05));
  z-index: -1;
  transform-origin: left;
  animation: vk-underline .9s cubic-bezier(.2, .9, .2, 1) .3s both;
}
@keyframes vk-underline { from { transform: scaleX(0); } to { transform: scaleX(1); } }

.vk-note {
  margin: 0;
  font-family: -apple-system, "PingFang SC", sans-serif;
  font-size: 13.5px;
  color: rgba(236, 231, 219, .58);
}

/* 二维码分镜 */
.vk-qr-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  width: min(380px, 100%);
  margin: 0 auto;
}
.vk-qr { margin: 0; min-width: 0; position: relative; }
.vk-qr .box {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 6px;
  background-color: #fff;
  background-image: var(--qr);
  background-size: cover;
  background-position: center;
  /* 没图时：白底 + 金色细格，不出现裂图 */
  box-shadow: 0 0 0 1px rgba(201, 169, 106, .5), 0 18px 40px -20px #000;
}
.vk-qr .box::after {
  content: "QR";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 10.5px;
  letter-spacing: .3em;
  color: #8b7a52;
  background-image:
    linear-gradient(rgba(201,169,106,.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,169,106,.14) 1px, transparent 1px);
  background-size: 12px 12px;
}
.vk-qr.has-img .box::after { content: none; }
.vk-qr figcaption {
  margin-top: 9px;
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(236, 231, 219, .6);
}
.vk-qr.has-img .box { background-color: #fff; }

/* 注释带 */
.vk-notes {
  position: absolute;
  left: 28px; right: 28px; bottom: 74px;
  z-index: 6;
  padding-top: 9px;
  border-top: 1px solid rgba(201, 169, 106, .22);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(236, 231, 219, .42);
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

/* 双语字幕带 */
.vk-subs {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 6;
  padding: 14px 28px 18px;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, .55));
}
.vk-cn {
  margin: 0 0 3px;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(14px, 1.5vw, 17px);
  font-weight: 700;
  letter-spacing: .02em;
  color: #f4f0e6;
  min-height: 1.4em;
}
.vk-en {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: rgba(201, 169, 106, .8);
  min-height: 1.4em;
}
.vk-cn .caret, .vk-en .caret {
  display: inline-block;
  width: 2px; height: 1em;
  margin-left: 3px;
  vertical-align: -.12em;
  background: #c9a96a;
  animation: vk-caret 1s steps(2) infinite;
}
@keyframes vk-caret { 50% { opacity: 0; } }

/* 按钮：金色描边，悬停反色 */
.vk-actions {
  position: absolute;
  right: 28px;
  bottom: 104px;
  z-index: 7;
}
.vk-btn {
  appearance: none;
  cursor: pointer;
  padding: 9px 18px;
  font: inherit;
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #c9a96a;
  background: rgba(201, 169, 106, .06);
  border: 1px solid rgba(201, 169, 106, .55);
  border-radius: 2px;
  transition: background .22s, color .22s, box-shadow .22s;
}
.vk-btn:hover {
  background: #c9a96a;
  color: #0a0a1e;
  box-shadow: 0 0 24px rgba(201, 169, 106, .45);
}

/* 水印 */
.vk-mark {
  position: absolute;
  z-index: 6;
  left: 15px; top: 66px;
  font-size: 9.5px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: rgba(236, 231, 219, .18);
  writing-mode: vertical-rl;
}

@media (max-width: 720px) {
  .vk-frame { aspect-ratio: auto; min-height: 460px; }
  .vk-stage { inset: 58px 20px 108px; }
  .vk-hud { left: 20px; right: 20px; }
  .vk-corners { inset: 8px; }
  .vk-notes { left: 20px; right: 20px; bottom: 84px; font-size: 9.5px; }
  .vk-subs { padding: 12px 20px 16px; }
  .vk-mark { display: none; }
  .vk-actions { right: 20px; bottom: 118px; }
  .vk-title { font-size: 26px; }
  .vk-qr-row { gap: 14px; width: min(300px, 100%); }
}

@media (prefers-reduced-motion: reduce) {
  .vk-frame::before, .vk-frame::after { animation: none; }
}

/* ---------- 页脚 ---------- */
.footer {
  max-width: var(--maxw);
  margin: 48px auto 0;
  padding: 28px 20px 56px;
  color: var(--fg-dim);
  font-size: 13.5px;
  border-top: 1px solid var(--glass-line);
}
.footer .row { display: flex; flex-wrap: wrap; gap: 10px 20px; justify-content: space-between; }
.footer a { border-bottom: 1px solid transparent; transition: border-color .2s, color .2s; }
.footer a:hover { color: var(--fg); border-bottom-color: currentColor; }

/* ---------- 渐进增强：滚动淡入（不支持就正常显示） ---------- */
@supports (animation-timeline: view()) {
  .card, .steps li, .wall figure {
    animation: rise linear both;
    animation-timeline: view();
    animation-range: entry 5% cover 26%;
  }
  @keyframes rise {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

/* ---------- 打赏弹窗（从 nav 打开） ---------- */
.nav-tip {
  appearance: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font: inherit;
  font-size: 14.5px;
  color: #8a6b1f;
  background: rgba(201, 169, 106, .14);
  border: 1px solid rgba(201, 169, 106, .55);
  border-radius: 999px;
  transition: background .2s, color .2s, box-shadow .2s, transform .2s;
}
.nav-tip:hover {
  background: #c9a96a;
  color: #1a1408;
  box-shadow: 0 10px 24px -12px rgba(201, 169, 106, .9);
  transform: translateY(-1px);
}
.nav-tip span { font-size: 13px; }
@media (prefers-color-scheme: dark) {
  .nav-tip { color: #e2c98f; background: rgba(201, 169, 106, .16); }
  .nav-tip:hover { color: #16120a; background: #c9a96a; }
}

.tip-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 24px 20px;
  visibility: hidden;
  opacity: 0;
  transition: opacity .28s ease, visibility .28s;
}
.tip-modal.show { visibility: visible; opacity: 1; }

.tip-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 6, 18, .62);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
}

.tip-modal .vk-frame {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  aspect-ratio: 16 / 9;
  min-height: 0;
  transform: translateY(16px) scale(.97);
  opacity: 0;
  transition: transform .5s cubic-bezier(.2, 1.14, .3, 1.3), opacity .34s ease;
}
.tip-modal.show .vk-frame { transform: none; opacity: 1; }

.tip-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 8;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  font: inherit;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  color: rgba(236, 231, 219, .6);
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(201, 169, 106, .3);
  border-radius: 2px;
  transition: color .2s, border-color .2s, background .2s;
}
.tip-close:hover {
  color: #0a0a1e;
  background: #c9a96a;
  border-color: #c9a96a;
}

/* 弹窗里的舞台留白更紧凑 */
.tip-modal .vk-hud { padding-right: 46px; }
.tip-modal .vk-stage { inset: 52px 26px 88px; }
.tip-modal .vk-notes { left: 26px; right: 26px; bottom: 66px; }
.tip-modal .vk-subs { padding: 12px 26px 14px; }
.tip-modal .vk-qr-row { width: min(320px, 100%); }

@media (max-width: 720px) {
  .tip-modal { padding: 12px; }
  .tip-modal .vk-frame { width: 100%; aspect-ratio: auto; min-height: 430px; }
  .tip-modal .vk-hud { left: 18px; right: 18px; padding-right: 44px; }
  .tip-modal .vk-stage { inset: 50px 18px 104px; }
  .tip-modal .vk-notes { left: 18px; right: 18px; bottom: 78px; font-size: 9px; }
  .tip-modal .vk-subs { padding: 10px 18px 12px; }
  .tip-modal .vk-title { font-size: 24px; }
  .tip-modal .vk-qr-row { width: min(270px, 100%); gap: 14px; }
  .nav-tip { padding: 7px 11px; font-size: 13.5px; }
  .vk-ep-en { display: none; }
}