:root {
  --brand: #0a7d4b;
  --brand-2: #12a35f;
  --brand-3: #2ecc82;
  --ink: #1b2a22;
  --ink-soft: #2c3f35;
  --muted: #5a6b62;
  --bg: #f5faf7;
  --bg-alt: #eaf4ee;
  --card: #ffffff;
  --card-glass: rgba(255, 255, 255, 0.72);
  --line: #d8e8df;
  --accent: #f2b705;
  --accent-soft: rgba(242, 183, 5, 0.14);
  --radius: 14px;
  --radius-lg: 22px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 10px rgba(10, 60, 40, 0.05);
  --shadow-md: 0 10px 30px rgba(10, 60, 40, 0.09);
  --shadow-lg: 0 20px 48px rgba(10, 60, 40, 0.16);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.32s;
  --grad-brand: linear-gradient(135deg, #0a7d4b 0%, #12a35f 55%, #2ecc82 100%);
  --grad-hero: linear-gradient(155deg, #073d26 0%, #0a7d4b 38%, #12a35f 72%, #2ecc82 100%);
  --grad-accent: linear-gradient(135deg, #f2b705 0%, #ffd54a 100%);
}

body.dark {
  --ink: #e8f3ec;
  --ink-soft: #d3e6db;
  --muted: #a8bcb0;
  --bg: #0f1713;
  --bg-alt: #121d17;
  --card: #16221c;
  --card-glass: rgba(22, 34, 28, 0.68);
  --line: #26382e;
  --accent-soft: rgba(242, 183, 5, 0.16);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.55);
  --grad-hero: linear-gradient(155deg, #04120b 0%, #073d26 40%, #0a7d4b 78%, #12a35f 100%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
  overflow-x: hidden;
}

body.dark {
  background: var(--bg);
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

img,
svg {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 18px;
}

/* ===== Header ===== */
header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--card-glass);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  transition: transform var(--dur) var(--ease);
}

.brand:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.brand .logo {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--grad-brand);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 6px 16px rgba(10, 125, 75, 0.35);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.brand:hover .logo {
  transform: rotate(-6deg) scale(1.05);
  box-shadow: 0 10px 22px rgba(10, 125, 75, 0.45);
}

nav.main {
  margin-left: auto;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav.main a {
  position: relative;
  padding: 7px 11px;
  border-radius: 9px;
  color: var(--ink);
  font-size: 14.5px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

nav.main a::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

nav.main a:hover {
  background: var(--bg-alt);
  text-decoration: none;
  color: var(--brand);
}

nav.main a:hover::after {
  transform: scaleX(1);
}

.tools {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
  color: var(--brand);
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: var(--grad-brand);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 18px rgba(10, 125, 75, 0.32);
}

.btn.primary:hover {
  color: #fff;
  box-shadow: 0 12px 26px rgba(10, 125, 75, 0.42);
}

.search-box {
  display: none;
  position: absolute;
  right: 18px;
  top: 64px;
  background: var(--card-glass);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow-lg);
  width: min(340px, 90vw);
  z-index: 60;
}

.search-box.show {
  display: block;
  animation: dropIn 0.28s var(--ease);
}

@keyframes dropIn {
  from {
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.search-box input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  font-family: inherit;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.search-box input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(18, 163, 95, 0.16);
  outline: none;
}

.menu-toggle {
  display: none;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  background: var(--grad-hero);
  color: #fff;
  padding: 52px 0 46px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  top: -220px;
  right: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22), transparent 68%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  bottom: -240px;
  left: -140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 183, 5, 0.2), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 34px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.35;
  margin: 0 0 14px;
  letter-spacing: 0.2px;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.18);
}

.hero p.lead {
  font-size: 16.5px;
  opacity: 0.96;
  margin: 0 0 20px;
  max-width: 62ch;
}

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

.hero .cta .btn {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.hero .cta .btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #fff;
  color: #fff;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.25);
}

.hero .cta .btn.solid {
  background: #fff;
  color: var(--brand);
  border-color: #fff;
  font-weight: 700;
}

.hero .cta .btn.solid:hover {
  background: var(--grad-accent);
  color: #3a2c00;
  border-color: transparent;
}

/* ===== Slider ===== */
.slider {
  position: relative;
  background: rgba(255, 255, 255, 0.12);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 236px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.2);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.slider:hover {
  transform: translateY(-3px);
  box-shadow: 0 26px 58px rgba(0, 0, 0, 0.28);
}

.slide {
  display: none;
  padding: 24px 24px 40px;
}

.slide.active {
  display: block;
  animation: fade 0.55s var(--ease);
}

@keyframes fade {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.slide h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.45;
}

.slide p {
  margin: 0;
  opacity: 0.94;
  font-size: 14.5px;
}

.slide .tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 3px 11px;
  border-radius: 20px;
  font-size: 12.5px;
  margin-bottom: 10px;
  letter-spacing: 0.3px;
}

.dots {
  position: absolute;
  bottom: 14px;
  left: 24px;
  display: flex;
  gap: 8px;
}

.dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), width var(--dur) var(--ease);
}

.dots span:hover {
  background: rgba(255, 255, 255, 0.8);
  transform: scale(1.2);
}

.dots span.on {
  background: #fff;
  width: 22px;
  border-radius: 5px;
}

/* ===== Stats ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.stat {
  background: rgba(255, 255, 255, 0.12);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
  padding: 14px;
  text-align: center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.stat:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

.stat b {
  display: block;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0.5px;
}

.stat small {
  opacity: 0.9;
  font-size: 12.5px;
}

/* ===== Crumbs ===== */
.crumbs {
  font-size: 13.5px;
  color: var(--muted);
  padding: 14px 0;
}

.crumbs a {
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.crumbs a:hover {
  color: var(--brand);
}

/* ===== Sections ===== */
section {
  padding: 34px 0;
  scroll-margin-top: 76px;
}

h2 {
  font-size: clamp(21px, 2.4vw, 27px);
  margin: 0 0 8px;
  line-height: 1.4;
  letter-spacing: 0.2px;
}

h3 {
  font-size: 18px;
  margin: 22px 0 8px;
  line-height: 1.5;
}

h4 {
  font-size: 16px;
  margin: 16px 0 6px;
}

.sub {
  color: var(--muted);
  margin: 0 0 20px;
  font-size: 15px;
}

/* ===== Grid & Cards ===== */
.grid {
  display: grid;
  gap: 18px;
}

.g2 {
  grid-template-columns: repeat(2, 1fr);
}

.g3 {
  grid-template-columns: repeat(3, 1fr);
}

.g4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(18, 163, 95, 0.4);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  margin-top: 0;
}

.card h3 a {
  color: inherit;
}

.card p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14.8px;
}

.card p:last-child {
  margin-bottom: 0;
}

.card ul {
  margin: 6px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 14.6px;
}

.card li {
  margin: 4px 0;
}

.card li::marker {
  color: var(--brand-2);
}

/* ===== TOC ===== */
.toc {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  box-shadow: var(--shadow-sm);
}

.toc ol {
  margin: 10px 0 0;
  padding-left: 20px;
  columns: 2;
  column-gap: 26px;
  font-size: 14.6px;
}

.toc li {
  margin: 5px 0;
  break-inside: avoid;
}

.toc a {
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.toc a:hover {
  text-decoration: none;
  color: var(--brand-2);
  padding-left: 3px;
}

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== Articles ===== */
article.post {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

article.post:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(18, 163, 95, 0.38);
}

article.post h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.5;
}

article.post .meta {
  font-size: 12.8px;
  color: var(--muted);
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

article.post .meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

article.post .meta span:first-child::before {
  content: "◷";
  color: var(--brand-2);
}

article.post .meta span:last-child::before {
  content: "◈";
  color: var(--accent);
}

article.post p {
  font-size: 14.6px;
  color: var(--muted);
  margin: 0 0 12px;
}

article.post a.more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--brand);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    gap var(--dur) var(--ease);
}

article.post a.more::after {
  content: "→";
  transition: transform var(--dur) var(--ease);
}

article.post a.more:hover {
  text-decoration: none;
  background: var(--grad-brand);
  color: #fff;
}

article.post a.more:hover::after {
  transform: translateX(4px);
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.faq-item:hover {
  border-color: rgba(18, 163, 95, 0.42);
  box-shadow: var(--shadow-md);
}

.faq-item.open {
  border-color: var(--brand-2);
  box-shadow: var(--shadow-md);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  padding: 15px 18px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  font-family: inherit;
  line-height: 1.6;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.faq-q:hover {
  color: var(--brand);
  background: var(--bg-alt);
}

.faq-q .ic {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--brand);
  font-size: 16px;
  font-weight: 700;
  transition: transform 0.3s var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.faq-item.open .faq-q .ic {
  transform: rotate(45deg);
  background: var(--grad-brand);
  color: #fff;
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.36s var(--ease);
}

.faq-a p {
  margin: 0;
  padding: 0 18px 16px;
  color: var(--muted);
  font-size: 14.8px;
}

.faq-item.open .faq-a {
  max-height: 640px;
}

/* ===== Steps ===== */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0;
}

.steps li {
  position: relative;
  padding: 0 0 20px 46px;
  border-left: 2px solid var(--line);
  margin-left: 14px;
  transition: border-color var(--dur) var(--ease);
}

.steps li:hover {
  border-left-color: var(--brand-2);
}

.steps li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: -15px;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--grad-brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(10, 125, 75, 0.3);
  transition: transform var(--dur) var(--ease);
}

.steps li:hover::before {
  transform: scale(1.12);
}

.steps li h4 {
  margin: 0 0 4px;
}

.steps li p {
  margin: 0;
  color: var(--muted);
  font-size: 14.6px;
}

/* ===== Table ===== */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14.6px;
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--line);
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 11px 13px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--bg-alt);
  font-weight: 700;
  color: var(--ink);
}

tr:last-child td {
  border-bottom: 0;
}

tbody tr {
  transition: background var(--dur) var(--ease);
}

tbody tr:hover {
  background: var(--bg-alt);
}

/* ===== Quote ===== */
.quote {
  position: relative;
  background: var(--card);
  border-left: 4px solid var(--brand-2);
  border-radius: var(--radius);
  padding: 16px 18px 16px 22px;
  font-size: 14.8px;
  color: var(--muted);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.quote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.quote b {
  color: var(--ink);
  font-size: 13.8px;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14.8px;
}

.contact-list li {
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  transition: background var(--dur) var(--ease);
}

.contact-list li:last-child {
  border-bottom: 0;
}

.contact-list b {
  min-width: 96px;
  color: var(--ink);
}

.contact-list span {
  color: var(--muted);
  word-break: break-word;
}

/* ===== Author box ===== */
.author-box {
  display: flex;
  gap: 14px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  font-size: 14.4px;
  color: var(--muted);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.author-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.author-box .avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  flex: 0 0 auto;
  box-shadow: 0 6px 16px rgba(10, 125, 75, 0.25);
}

/* ===== Footer ===== */
footer.site {
  position: relative;
  background: linear-gradient(180deg, #0c1512 0%, #08100d 100%);
  color: #c6d6cd;
  margin-top: 20px;
  padding: 40px 0 22px;
  border-top: 1px solid #1c2b24;
}

footer.site::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-brand);
}

footer.site a {
  color: #c6d6cd;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

footer.site a:hover {
  color: var(--brand-3);
  text-decoration: none;
  padding-left: 3px;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 24px;
}

footer.site h4 {
  color: #fff;
  font-size: 15px;
  margin: 0 0 12px;
  position: relative;
  padding-bottom: 8px;
}

footer.site h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
}

footer.site ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
}

footer.site li {
  margin: 6px 0;
}

.copyright {
  border-top: 1px solid #22322b;
  margin-top: 26px;
  padding-top: 16px;
  font-size: 13px;
  color: #93a89d;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Back to top ===== */
#toTop {
  position: fixed;
  right: 18px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 0;
  background: var(--grad-brand);
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  display: none;
  box-shadow: 0 8px 22px rgba(10, 125, 75, 0.4);
  z-index: 60;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#toTop.show {
  display: block;
  animation: popIn 0.3s var(--ease);
}

#toTop:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 14px 32px rgba(10, 125, 75, 0.5);
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.7);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--brand), var(--brand-2));
  border-radius: 10px;
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-2);
}

::selection {
  background: var(--brand-2);
  color: #fff;
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .g4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .g3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .foot-grid {
    grid-template-columns: 1fr 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15.5px;
  }
  nav.main {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--card-glass);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 10px 18px;
    box-shadow: var(--shadow-md);
    animation: dropIn 0.26s var(--ease);
  }
  nav.main.open {
    display: flex;
  }
  nav.main a {
    padding: 10px 12px;
  }
  nav.main a::after {
    display: none;
  }
  .menu-toggle {
    display: inline-block;
  }
  .g2,
  .g3,
  .g4 {
    grid-template-columns: 1fr;
  }
  .toc ol {
    columns: 1;
  }
  .foot-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 38px 0 34px;
  }
  .hero-grid {
    gap: 24px;
  }
  .stats {
    gap: 10px;
  }
  .stat b {
    font-size: 20px;
  }
  section {
    padding: 26px 0;
    scroll-margin-top: 64px;
  }
  .card,
  article.post {
    padding: 16px;
    border-radius: var(--radius);
  }
  .search-box {
    right: 10px;
    left: 10px;
    width: auto;
  }
  .faq-q {
    font-size: 15px;
    padding: 13px 14px;
  }
  .faq-a p {
    padding: 0 14px 14px;
  }
  .steps li {
    padding-left: 40px;
  }
  table {
    font-size: 13.6px;
  }
  th,
  td {
    padding: 9px 10px;
  }
}

@media (max-width: 420px) {
  .brand span:last-child {
    font-size: 15.5px;
  }
  .brand .logo {
    width: 34px;
    height: 34px;
    font-size: 12.5px;
  }
  .btn {
    padding: 6px 10px;
    font-size: 13px;
  }
  .hero .cta {
    gap: 8px;
  }
  .hero .cta .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

/* ===== Print ===== */
@media print {
  header.site,
  footer.site,
  #toTop,
  .tools,
  .slider,
  .dots,
  .hero .cta {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .card,
  article.post,
  .faq-item,
  table {
    box-shadow: none;
    border: 1px solid #ccc;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}