/* ==========================================================================
   TokenFree · Token 自由攻略
   主题：Claude 风格 · 温暖、克制、编辑式 · 简洁实用
   设计令牌源自 Claude 设计系统（赤陶橙主色 / 纸质暖中性 / 衬线标题）
   ========================================================================== */

:root {
  /* Claude 品牌主色（赤陶橙）—— 浅色模式用稍深的 #c96442 保证对比 */
  --brand-1: #c96442;
  --brand-2: #d97757;
  --brand-3: #b0683f;

  --ok: #5b8c4e;
  --warn: #b4722e;
  --risk: #b5453a;

  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 20px;

  --shadow-1: 0 1px 3px rgba(28, 26, 22, .05), 0 4px 16px rgba(28, 26, 22, .05);
  --shadow-2: 0 2px 6px rgba(28, 26, 22, .07), 0 12px 36px rgba(28, 26, 22, .08);

  --maxw: 1180px;
  --nav-h: 62px;

  --font-display: "Newsreader", Georgia, "Source Han Serif SC", "Noto Serif SC",
    "Songti SC", SimSun, ui-serif, serif;
  --font-sans: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    "Source Han Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, SFMono-Regular,
    "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --font: var(--font-sans);
  --mono: var(--font-mono);
}

/* ---------- theme: dark (default · 暖炭灰，非纯黑) ---------- */
html[data-theme="dark"] {
  --bg: #1b1b19;
  --bg-2: #262624;
  --surface: rgba(250, 249, 245, .04);
  --surface-solid: #2c2c2b;
  --surface-hover: rgba(250, 249, 245, .07);
  --border: rgba(250, 249, 245, .10);
  --border-strong: rgba(250, 249, 245, .18);
  --text: #d8d6cd;
  --text-strong: #faf9f5;
  --muted: #b7b5a9;
  --faint: #908e84;
  --code-bg: rgba(250, 249, 245, .06);
  --accent: #d97757;
  --brand-1: #d97757;
  --brand-2: #e08d6f;
  --brand-3: #c96442;
  --ok: #9bb07a;
  --warn: #d99a4e;
  --risk: #e5765c;
  --glow-1: rgba(217, 119, 87, .12);
  --glow-2: rgba(176, 168, 150, .07);
  --glow-3: rgba(217, 119, 87, .08);
  color-scheme: dark;
}
/* ---------- theme: light (纸质暖底) ---------- */
html[data-theme="light"] {
  --bg: #f5f4ee;
  --bg-2: #faf9f5;
  --surface: #ffffff;
  --surface-solid: #ffffff;
  --surface-hover: #f1efe7;
  --border: #e7e3d6;
  --border-strong: #d6d1c2;
  --text: #3a3935;
  --text-strong: #1b1b19;
  --muted: #6e6d68;
  --faint: #908e84;
  --code-bg: #efece2;
  --accent: #c96442;
  --brand-1: #c96442;
  --brand-2: #d97757;
  --brand-3: #b0683f;
  --ok: #5b8c4e;
  --warn: #b4722e;
  --risk: #b5453a;
  --glow-1: rgba(201, 100, 66, .05);
  --glow-2: rgba(176, 168, 150, .04);
  --glow-3: rgba(201, 100, 66, .04);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 18px);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 15.5px;
  letter-spacing: .005em;
  overflow-x: hidden;
  transition: background .35s ease, color .35s ease;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: opacity .18s ease; }
a:hover { opacity: .82; }
::selection { background: color-mix(in srgb, var(--accent) 22%, transparent); }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- 背景装饰：极淡的暖色光晕，编辑式克制 ---------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}
.aurora span {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  opacity: .6;
  animation: drift 26s ease-in-out infinite alternate;
}
.aurora span:nth-child(1) {
  width: 46vw; height: 46vw; top: -14vw; left: -8vw;
  background: var(--glow-1);
}
.aurora span:nth-child(2) {
  width: 36vw; height: 36vw; top: 8vw; right: -10vw;
  background: var(--glow-2); animation-delay: -8s;
}
.aurora span:nth-child(3) {
  width: 40vw; height: 40vw; top: 58vh; left: 34vw;
  background: var(--glow-3); animation-delay: -15s;
}
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(2.5vw, 4vh, 0) scale(1.12); }
}

/* ---------- 滚动进度：单色赤陶橙 ---------- */
.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--accent);
  z-index: 90; transition: width .1s linear;
}
/* ---------- 顶部导航 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 80;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.topbar.is-stuck { border-bottom-color: var(--border); }
.topbar .wrap { display: flex; align-items: center; gap: 18px; }

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text-strong); letter-spacing: -.01em; }
.brand:hover { opacity: 1; }
.brand-mark {
  width: 30px; height: 30px; flex: none; border-radius: 9px;
  background: var(--accent);
  display: grid; place-items: center;
  color: #fff; font-size: 15px; font-weight: 800;
  box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 38%, transparent);
}
.brand-text { font-size: 16.5px; font-family: var(--font-display); font-weight: 600; }
.brand-text small {
  display: block; font-size: 11px; font-weight: 500;
  color: var(--faint); letter-spacing: .06em; line-height: 1;
}

.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a.nav-link {
  color: var(--muted); font-size: 14px; font-weight: 500;
  padding: 7px 12px; border-radius: 9px; white-space: nowrap;
}
.nav a.nav-link:hover { color: var(--text-strong); background: var(--surface-hover); opacity: 1; }
.nav a.nav-link.active { color: var(--text-strong); background: var(--surface-hover); }
.icon-btn {
  width: 36px; height: 36px; flex: none;
  display: grid; place-items: center;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--muted);
  cursor: pointer; font-size: 15px;
  transition: color .2s, border-color .2s, transform .2s, background .2s;
}
.icon-btn:hover { color: var(--text-strong); border-color: var(--border-strong); transform: translateY(-1px); }
.icon-btn svg { width: 17px; height: 17px; }

.nav-toggle { display: none; }

/* ---------- hero ---------- */
.hero { padding: 64px 0 40px; position: relative; }
.hero-grid {
  display: grid; gap: 24px 52px; align-items: center;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
}
.hero-figure {
  position: relative; margin: 0; overflow: hidden;
  border-radius: 22px; border: 1px solid var(--border-strong);
  background: #0d0b09;
  box-shadow: 0 30px 70px -26px rgba(0, 0, 0, .62),
              0 12px 40px -14px color-mix(in srgb, var(--accent) 32%, transparent);
  animation: heroIn .9s .1s cubic-bezier(.22, .8, .32, 1) both;
}
.hero-figure::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255, 248, 238, .05), transparent 34%);
}
.hero-figure img { display: block; width: 100%; height: auto; }
.hero-figure-tag {
  position: absolute; left: 14px; bottom: 14px; z-index: 1;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 13px; border-radius: 999px;
  background: color-mix(in srgb, #16110d 78%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 240, 224, .16);
  color: #f8ecdd; font-size: 12.5px; font-weight: 500; white-space: nowrap;
}
.hero-figure-tag svg { width: 13px; height: 13px; flex: none; color: var(--brand-2); }
@keyframes heroIn { from { opacity: 0; transform: translateY(22px) scale(.98); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .hero-figure { animation: none; } }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 13px 5px 7px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
  font-size: 12.5px; color: var(--muted); margin-bottom: 22px;
}
.hero-badge b { color: var(--text-strong); font-weight: 600; }
.dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: .45; } }

.hero h1 {
  margin: 0 0 18px; font-family: var(--font-display);
  font-size: clamp(34px, 6.2vw, 60px);
  line-height: 1.12; font-weight: 600;
  letter-spacing: -.015em; color: var(--text-strong);
}
/* 标题里的强调字：实色赤陶橙，编辑式而非渐变炫光 */
.grad { color: var(--accent); }
.hero-lead {
  margin: 0 0 12px; max-width: 720px;
  font-size: clamp(15.5px, 2.1vw, 18px); color: var(--muted);
}
.hero-lead strong { color: var(--text-strong); font-weight: 600; }

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 12px;
  font-size: 14.5px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; white-space: nowrap;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn:hover { opacity: 1; transform: translateY(-2px); }
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 32%, transparent);
}
.btn-primary:hover { box-shadow: 0 10px 28px color-mix(in srgb, var(--accent) 44%, transparent); }
.btn-ghost {
  background: var(--surface); color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--border-strong); background: var(--surface-hover); }
.btn-sm { padding: 7px 13px; font-size: 13px; border-radius: 9px; }

/* ---------- hero stats ---------- */
.stats {
  display: grid; gap: 14px; margin-top: 46px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.stat {
  padding: 18px 18px 16px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface);
  backdrop-filter: blur(8px);
  transition: transform .22s ease, border-color .22s ease;
}
.stat:hover { transform: translateY(-3px); border-color: var(--border-strong); }
.stat-num {
  font-size: 27px; font-weight: 700; line-height: 1.2;
  color: var(--text-strong); letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}
.stat-num i { font-size: 15px; font-style: normal; color: var(--muted); font-weight: 600; margin-left: 2px; }
.stat-label { font-size: 12.5px; color: var(--faint); margin-top: 3px; }

/* ---------- layout: sidebar + content ---------- */
.layout {
  display: grid; gap: 44px; align-items: start;
  grid-template-columns: 216px minmax(0, 1fr);
  padding: 26px 0 60px;
}
.toc { position: sticky; top: calc(var(--nav-h) + 22px); }
.toc-title {
  font-size: 11px; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--faint);
  padding: 0 12px 10px;
}
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc a {
  display: block; padding: 7px 12px; border-radius: 9px;
  font-size: 13.5px; color: var(--muted);
  border-left: 2px solid transparent; margin-bottom: 1px;
}
.toc a:hover { color: var(--text-strong); background: var(--surface-hover); opacity: 1; }
.toc a.active {
  color: var(--text-strong); font-weight: 600;
  background: var(--surface-hover);
  border-left-color: var(--accent);
}
/* ---------- sections ---------- */
.section { margin-bottom: 58px; scroll-margin-top: calc(var(--nav-h) + 20px); }
.section-head { margin-bottom: 22px; }
.eyebrow {
  display: inline-block; font-size: 11.5px; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 8px;
}
.section h2 {
  margin: 0; font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 30px); font-weight: 600;
  letter-spacing: -.015em; color: var(--text-strong); line-height: 1.3;
}
.section-desc { margin: 9px 0 0; color: var(--muted); font-size: 15px; max-width: 760px; }

.hero h1, .section h2, .step h3, .engage h3, .card-sub, .subhead { text-wrap: balance; }
.section-desc, .hero-lead { text-wrap: pretty; }

.subhead {
  margin: 34px 0 14px; font-family: var(--font-display);
  font-size: 19px; font-weight: 600;
  letter-spacing: -.01em; color: var(--text-strong);
}

/* ---------- notice / tip cards ---------- */
.tips { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(228px, 1fr)); }
.tip {
  position: relative; padding: 20px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface);
  overflow: hidden;
}
.tip::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 3px;
  background: var(--accent);
}
.tip h3 {
  margin: 0 0 6px; font-size: 15px; font-weight: 650; color: var(--text-strong);
  display: flex; align-items: center; gap: 8px;
}
.tip p { margin: 0; font-size: 13.8px; color: var(--muted); line-height: 1.7; }
.tip-ico { font-size: 16px; }

.callout {
  display: flex; gap: 13px; padding: 16px 18px;
  border-radius: var(--radius); font-size: 14px;
  border: 1px solid color-mix(in srgb, var(--warn) 34%, transparent);
  background: color-mix(in srgb, var(--warn) 9%, transparent);
  color: var(--text); margin: 18px 0 0; line-height: 1.7;
}
.callout .callout-ico { flex: none; font-size: 16px; line-height: 1.5; }
.callout.info {
  border-color: color-mix(in srgb, var(--accent) 34%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}
/* ---------- filter bar ---------- */
.filters {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding: 13px 15px; margin-bottom: 26px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
}
.filters-label { font-size: 12.5px; color: var(--faint); margin-right: 2px; }
.filters-label:not(:first-child) { margin-left: 10px; }
.chip {
  padding: 6px 13px; border-radius: 999px; cursor: pointer;
  font-size: 13px; font-weight: 500; color: var(--muted);
  border: 1px solid var(--border); background: transparent;
  transition: all .18s ease; font-family: inherit;
}
.chip:hover { color: var(--text-strong); border-color: var(--border-strong); }
.chip.active {
  color: #fff; font-weight: 600; border-color: transparent;
  background: var(--accent);
  box-shadow: 0 3px 12px color-mix(in srgb, var(--accent) 28%, transparent);
}
.filter-empty {
  display: none; padding: 40px 0; text-align: center;
  color: var(--faint); font-size: 14px;
}
.filter-empty.show { display: block; }

/* ---------- channel card ---------- */
.cards { display: grid; gap: 20px; }
.card {
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  background: var(--surface); overflow: hidden;
  transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
html[data-theme="light"] .card { box-shadow: var(--shadow-1); }
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
html[data-theme="light"] .card:hover { box-shadow: var(--shadow-2); }
.card[hidden] { display: none; }
.card-head {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 20px 22px 16px; flex-wrap: wrap;
}
.card-logo {
  width: 42px; height: 42px; flex: none; border-radius: 12px;
  display: grid; place-items: center;
  font-size: 17px; font-weight: 800; color: #fff;
  background: var(--accent);
  box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 26%, transparent);
}
.card-title-wrap { flex: 1 1 220px; min-width: 0; }
.card-title {
  margin: 0; font-size: 19px; font-weight: 700;
  color: var(--text-strong); letter-spacing: -.015em;
  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;
}
.card-sub { margin: 3px 0 0; font-size: 13px; color: var(--faint); }
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* ---------- badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: 999px;
  font-size: 11.5px; font-weight: 650; letter-spacing: .01em;
  border: 1px solid transparent; white-space: nowrap;
}
.badge .bdot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-ok {
  color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent);
  border-color: color-mix(in srgb, var(--ok) 32%, transparent);
}
.badge-warn {
  color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, transparent);
  border-color: color-mix(in srgb, var(--warn) 32%, transparent);
}
.badge-risk {
  color: var(--risk); background: color-mix(in srgb, var(--risk) 12%, transparent);
  border-color: color-mix(in srgb, var(--risk) 32%, transparent);
}
.badge-tag {
  color: var(--accent); background: color-mix(in srgb, var(--accent) 11%, transparent);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
}
.badge-plain { color: var(--muted); background: var(--code-bg); border-color: var(--border); }

/* ---------- card body ---------- */
.card-body { padding: 0 22px 20px; }
.meta {
  display: grid; gap: 10px; margin-bottom: 16px;
  grid-template-columns: repeat(auto-fit, minmax(146px, 1fr));
}
.meta-item {
  padding: 11px 13px; border-radius: var(--radius-sm);
  background: var(--code-bg); border: 1px solid var(--border);
}
.meta-k {
  font-size: 11px; color: var(--faint); letter-spacing: .04em;
  text-transform: uppercase; margin-bottom: 2px;
}
.meta-v { font-size: 13.6px; font-weight: 600; color: var(--text-strong); line-height: 1.45; overflow-wrap: anywhere; }
.meta-v.accent { color: var(--ok); }

.card-body ul { margin: 0 0 14px; padding-left: 4px; list-style: none; }
.card-body ul li {
  position: relative; padding-left: 20px; margin-bottom: 8px;
  font-size: 14.4px; color: var(--text); line-height: 1.75;
}
.card-body ul li::before {
  content: ""; position: absolute; left: 4px; top: .68em;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.card-body ul li strong { color: var(--text-strong); font-weight: 650; }
.card-body ul li em {
  font-style: normal; color: var(--warn); font-weight: 600;
}
.card-body > p { margin: 0 0 14px; font-size: 14.4px; color: var(--text); }
/* ---------- copyable code row ---------- */
.copyrow {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 9px 9px 13px; margin-bottom: 9px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--code-bg);
}
.copyrow .ck {
  font-size: 11.5px; color: var(--faint); flex: none;
  letter-spacing: .04em; text-transform: uppercase;
}
.copyrow code {
  flex: 1 1 auto; min-width: 0; font-family: var(--mono);
  font-size: 13px; color: var(--text-strong);
  overflow-x: auto; white-space: nowrap; scrollbar-width: none;
}
.copyrow code::-webkit-scrollbar { display: none; }
.copy-btn {
  flex: none; padding: 5px 11px; border-radius: 7px; cursor: pointer;
  font-size: 12px; font-weight: 600; font-family: inherit;
  border: 1px solid var(--border); background: var(--surface-solid);
  color: var(--muted); transition: all .18s ease;
}
.copy-btn:hover { color: var(--text-strong); border-color: var(--border-strong); }
.copy-btn.done { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }

code.inline {
  font-family: var(--mono); font-size: .88em;
  padding: 2px 6px; border-radius: 5px;
  background: var(--code-bg); border: 1px solid var(--border);
  color: var(--text-strong); white-space: nowrap;
}

/* ---------- figures & gallery ---------- */
.shots { display: grid; gap: 12px; margin-top: 16px; }
.shots.two { grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); }
.shots.narrow { max-width: 330px; margin: 18px auto 0; }
figure.shot { margin: 0; }
figure.shot img {
  width: 100%; border-radius: var(--radius-sm);
  border: 1px solid var(--border); cursor: zoom-in;
  background: var(--code-bg);
  transition: border-color .22s ease, transform .22s ease;
}
figure.shot img:hover { border-color: var(--border-strong); transform: scale(1.005); }
figure.shot figcaption {
  margin-top: 7px; font-size: 12.5px; color: var(--faint);
  text-align: center; line-height: 1.6;
}

/* ---------- lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200; display: none;
  align-items: center; justify-content: center; padding: 30px;
  background: rgba(20, 20, 18, .9);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  cursor: zoom-out;
}
.lightbox.open { display: flex; animation: fade .2s ease; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.lightbox img {
  max-width: 100%; max-height: 100%;
  border-radius: 10px; box-shadow: 0 24px 70px rgba(0, 0, 0, .6);
  object-fit: contain;
}
.lightbox-close {
  position: absolute; top: 18px; right: 22px;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid rgba(250, 249, 245, .22);
  background: rgba(250, 249, 245, .1); color: #faf9f5;
  font-size: 20px; cursor: pointer; line-height: 1;
}
.lightbox-close:hover { background: rgba(250, 249, 245, .2); }
/* ---------- steps (tutorial) ---------- */
.steps { counter-reset: st; display: grid; gap: 18px; }
.step {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  column-gap: 15px;
  align-items: start;
  padding: 20px 22px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); counter-increment: st;
}
.step::before {
  content: counter(st);
  grid-row: 1;
  width: 28px; height: 28px; border-radius: 9px;
  display: grid; place-items: center;
  font-size: 13.5px; font-weight: 800; color: #fff;
  background: var(--accent);
  box-shadow: 0 3px 10px color-mix(in srgb, var(--accent) 30%, transparent);
  margin-top: 2px;
}
.step h3 { grid-column: 2; margin: 2px 0 8px; font-size: 16px; font-weight: 650; color: var(--text-strong); }
.step > :not(h3) { grid-column: 2; }
.step p { margin: 0 0 10px; font-size: 14.3px; color: var(--muted); line-height: 1.75; }
.step p:last-child { margin-bottom: 0; }
.step p strong { color: var(--text-strong); font-weight: 650; }
.step ul { margin: 0 0 10px; padding-left: 4px; list-style: none; }
.step ul li {
  position: relative; padding-left: 20px; margin-bottom: 7px;
  font-size: 14.3px; color: var(--muted); line-height: 1.75;
}
.step ul li:last-child { margin-bottom: 0; }
.step ul li::before {
  content: ""; position: absolute; left: 4px; top: .68em;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.step ul li strong { color: var(--text-strong); font-weight: 650; }

/* ---------- engagement (like + comments) ---------- */
.engage {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  padding: 30px 22px; margin-bottom: 30px;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  background: var(--surface); text-align: center;
}
.engage h3 { margin: 0; font-size: 17px; font-weight: 650; color: var(--text-strong); }
.engage p { margin: 0; font-size: 13.8px; color: var(--muted); max-width: 560px; }
.likebtn-wrapper { margin-top: 4px; }

.comments-box {
  padding: 8px 18px 18px; min-height: 320px;
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  background: var(--surface);
}
.utterances { max-width: 100% !important; }
/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 34px; margin-top: 20px;
  background: color-mix(in srgb, var(--bg-2) 55%, transparent);
}
.footer-grid {
  display: flex; flex-direction: column; align-items: center; gap: 22px;
  text-align: center;
}
.footer-brand { max-width: 380px; display: flex; flex-direction: column; align-items: center; }
.footer-brand .brand { justify-content: center; }
.footer-brand p { margin: 10px 0 0; font-size: 13.2px; color: var(--faint); line-height: 1.75; text-align: center; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 22px; }
.footer-links a { font-size: 13.5px; color: var(--muted); }
.footer-links a:hover { color: var(--text-strong); opacity: 1; }

.site-stats {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px;
  margin-top: 26px; padding-top: 22px;
  border-top: 1px solid var(--border);
}
.stat-item {
  display: flex; align-items: center; gap: 7px;
  padding: 6px 13px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
  font-size: 12.5px;
}
.stat-label { color: var(--faint); }
.stat-value {
  font-weight: 700; color: var(--text-strong);
  font-variant-numeric: tabular-nums; font-family: var(--mono); font-size: 12px;
}
.copyright {
  margin: 18px 0 0; font-size: 12.5px; color: var(--faint);
  display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center;
  justify-content: center; text-align: center;
}
/* ---------- back to top ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 70;
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface-solid);
  color: var(--muted); box-shadow: var(--shadow-1);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all .26s ease;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--text-strong); transform: translateY(-3px); }
.to-top svg { width: 18px; height: 18px; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 34px; z-index: 210;
  transform: translate(-50%, 20px);
  padding: 10px 20px; border-radius: 999px;
  background: var(--surface-solid); color: var(--text-strong);
  border: 1px solid var(--border-strong); box-shadow: var(--shadow-2);
  font-size: 13.5px; font-weight: 600;
  opacity: 0; visibility: hidden; transition: all .26s ease;
}
.toast.show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(16px); }
.reveal.in {
  opacity: 1; transform: none;
  transition: opacity .55s ease, transform .55s cubic-bezier(.22, .8, .3, 1);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .aurora span { animation: none; }
  * { transition-duration: .01ms !important; }
}
/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  .layout { grid-template-columns: 1fr; gap: 0; }
  .toc { display: none; }
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
}

@media (max-width: 760px) {
  :root { --nav-h: 56px; }
  body { font-size: 15px; }
  .wrap { padding: 0 18px; }

  /* topbar & mobile menu */
  .brand-text { font-size: 15.5px; }
  .brand-text small { display: none; }
  .icon-btn { width: 40px; height: 40px; }
  .nav-toggle { display: grid; margin-left: auto; }
  .nav {
    position: fixed; inset: var(--nav-h) 0 auto;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 10px 18px 16px; margin: 0;
    background: var(--bg-2); border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-2);
    display: none;
  }
  .nav.open { display: flex; animation: navDrop .22s ease; }
  .nav a.nav-link { padding: 12px 14px; font-size: 15px; }
  .nav .nav-tail { display: flex; gap: 8px; padding-top: 10px; }

  /* hero */
  .hero { padding: 44px 0 28px; }
  .hero-grid { gap: 24px; }
  .hero-figure { border-radius: 16px; }
  .hero-figure-tag { left: 10px; bottom: 10px; font-size: 11.5px; padding: 6px 11px; gap: 6px; }
  .hero-badge { margin-bottom: 16px; font-size: 12px; }
  .hero-cta { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 26px; }
  .hero-cta .btn { justify-content: center; padding: 11px 10px; font-size: 14px; white-space: normal; }
  .hero-cta .btn-primary { grid-column: 1 / -1; }
  .stats { margin-top: 30px; grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat { padding: 14px 14px 13px; }
  .stat-num { font-size: 23px; }

  /* layout & sections */
  .layout { padding: 18px 0 40px; }
  .section { margin-bottom: 42px; }
  .section-head { margin-bottom: 18px; }

  /* tips / callouts */
  .tips { gap: 10px; }
  .tip { padding: 16px; }
  .callout { padding: 13px 14px; gap: 10px; font-size: 13.6px; margin-top: 14px; }

  /* filters: labels take a full row, chips wrap below */
  .filters { padding: 12px 14px; margin-bottom: 20px; }
  .filters .filters-label { flex-basis: 100%; margin: 2px 0 0; }
  .filters .filters-label:first-child { margin-top: 0; }
  .chip { padding: 7px 14px; font-size: 13px; }

  /* cards */
  .card-head { padding: 16px 16px 13px; gap: 12px; }
  .card-body { padding: 0 16px 16px; }
  .card-logo { width: 36px; height: 36px; font-size: 15px; border-radius: 10px; }
  .card-title { font-size: 17px; gap: 7px; }
  .card-actions { width: 100%; margin-top: 2px; }
  .card-actions .badge { flex: none; }
  .card-actions .btn { flex: 1 1 auto; justify-content: center; padding: 9px 12px; }
  .meta { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .meta-item { padding: 10px 11px; }

  /* steps */
  .step { padding: 16px; grid-template-columns: 26px minmax(0, 1fr); column-gap: 11px; }
  .step::before { width: 26px; height: 26px; font-size: 12.5px; }
  .subhead { margin: 26px 0 12px; font-size: 17px; }

  /* figures */
  .shots { gap: 10px; }
  .shots.two { grid-template-columns: 1fr; }
  .shots.narrow { margin-top: 14px; }

  /* comments & footer */
  .engage { padding: 24px 16px; }
  .comments-box { padding: 6px 10px 14px; }
  .footer { padding: 30px 0 26px; }
  .footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 14px; }
  .copyright { flex-direction: column; gap: 4px; }

  /* misc */
  .lightbox { padding: 14px; }
  .to-top { right: 14px; bottom: 14px; }
  .toast { left: 18px; right: 18px; bottom: 18px; transform: translateY(14px); }
  .toast.show { transform: translateY(0); }
  .aurora span { filter: blur(70px); }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@media (min-width: 761px) { .nav .nav-tail { display: flex; gap: 8px; margin-left: 8px; } }

/* touch devices: no sticky hover, add press feedback */
@media (hover: none) {
  .card:hover, .stat:hover, .btn:hover, .icon-btn:hover,
  figure.shot img:hover, .to-top:hover { transform: none; }
  .btn:active { transform: scale(.97); }
  .chip:active { transform: scale(.96); }
}