:root {
  --brand: #1D4ED8;
  --brand-dark: #1E3A8A;
  --brand-light: #60A5FA;
  --accent: #FDE68A;
  --accent-warm: #F59E0B;
  --text-main: #17202A;
  --text-sub: #334155;
  --text-mute: #4B5563;
  --bg: #FFFFFF;
  --bg-soft: #F1F5F9;
  --bg-card: #FFFFFF;
  --border: #CBD5E1;
  --link: #1D4ED8;
  --link-hover: #1E3A8A;
  --footer-bg: #0F172A;
  --footer-text: #E5E7EB;
  --footer-mute: #CBD5E1;
  --nav-bg: rgba(255, 255, 255, 0.78);
  --nav-text: #17202A;
  --btn-bg: #1D4ED8;
  --btn-text: #FFFFFF;
  --btn-hover: #1E3A8A;
  --shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 50px rgba(15, 23, 42, 0.16);
  --glass-bg: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.55);
  --glass-blur: saturate(180%) blur(18px);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 26px;
  --grad-hero: linear-gradient(135deg, #0F172A 0%, #1E3A8A 52%, #1D4ED8 100%);
  --grad-brand: linear-gradient(135deg, #1D4ED8 0%, #60A5FA 100%);
  --grad-accent: linear-gradient(135deg, #FDE68A 0%, #F59E0B 100%);
  --grad-soft: linear-gradient(160deg, rgba(29, 78, 216, 0.08) 0%, rgba(96, 165, 250, 0.04) 100%);
}

[data-theme="dark"] {
  --brand: #60A5FA;
  --brand-dark: #93C5FD;
  --brand-light: #BFDBFE;
  --accent: #FCD34D;
  --accent-warm: #FBBF24;
  --text-main: #F1F5F9;
  --text-sub: #E2E8F0;
  --text-mute: #CBD5E1;
  --bg: #0B1220;
  --bg-soft: #111C30;
  --bg-card: #152238;
  --border: #334155;
  --link: #93C5FD;
  --link-hover: #BFDBFE;
  --footer-bg: #060B16;
  --footer-text: #E5E7EB;
  --footer-mute: #CBD5E1;
  --nav-bg: rgba(11, 18, 32, 0.78);
  --nav-text: #F1F5F9;
  --btn-bg: #2563EB;
  --btn-text: #FFFFFF;
  --btn-hover: #3B82F6;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.65);
  --glass-bg: rgba(21, 34, 56, 0.62);
  --glass-border: rgba(148, 163, 184, 0.28);
  --grad-hero: linear-gradient(135deg, #060B16 0%, #0F1E3D 52%, #1D4ED8 100%);
  --grad-soft: linear-gradient(160deg, rgba(96, 165, 250, 0.12) 0%, rgba(37, 99, 235, 0.06) 100%);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI", Arial, sans-serif;
  background:
    radial-gradient(1200px 600px at 12% -8%, rgba(29, 78, 216, 0.10), transparent 60%),
    radial-gradient(900px 520px at 100% 0%, rgba(96, 165, 250, 0.10), transparent 62%),
    var(--bg);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background 0.35s ease, color 0.35s ease;
}

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

a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.22s ease, opacity 0.22s ease;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  color: var(--text-main);
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: 2.1rem;
  letter-spacing: 0.5px;
}

h2 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--text-sub);
}

p {
  color: var(--text-main);
  margin-bottom: 1rem;
}

ul {
  list-style: none;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
}

section:last-of-type {
  border-bottom: none;
}

.section-title {
  font-size: 1.7rem;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 54px;
  height: 4px;
  border-radius: 999px;
  background: var(--grad-accent);
}

.section-sub {
  color: var(--text-mute);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

/* ============ Header / Nav ============ */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  transition: background 0.35s ease, border-color 0.35s ease;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  max-width: 1180px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
  text-decoration: none;
  transition: transform 0.25s ease;
}

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

.logo svg {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  box-shadow: 0 6px 16px rgba(29, 78, 216, 0.35);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.4s ease;
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 10px 24px rgba(29, 78, 216, 0.5);
}

.logo span {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

nav.main-nav ul {
  display: flex;
  list-style: none;
  gap: 22px;
}

nav.main-nav a {
  color: var(--nav-text);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  position: relative;
  transition: color 0.22s ease, border-color 0.22s ease;
}

nav.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
  transition: right 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

nav.main-nav a:hover,
nav.main-nav a:focus {
  color: var(--brand);
  border-bottom-color: transparent;
  text-decoration: none;
}

nav.main-nav a:hover::after,
nav.main-nav a:focus::after {
  right: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 4px 8px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.search-box:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.16);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text-main);
  font-size: 0.9rem;
  width: 140px;
  font-family: inherit;
}

.search-box input::placeholder {
  color: var(--text-mute);
}

.search-box button {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  font-size: 0.85rem;
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.22s ease, transform 0.22s ease;
}

.search-box button:hover {
  background: var(--btn-hover);
  color: var(--btn-text);
  transform: translateY(-1px);
}

.theme-toggle {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  color: var(--text-main);
  border-radius: var(--radius-md);
  padding: 7px 10px;
  cursor: pointer;
  font-size: 0.9rem;
  font-family: inherit;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.theme-toggle:hover {
  background: var(--brand);
  color: #fff;
  transform: translateY(-1px);
}

.menu-toggle {
  display: none;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  border-radius: var(--radius-md);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background 0.25s ease, color 0.25s ease;
}

.menu-toggle:hover {
  background: var(--brand);
  color: #fff;
}

/* ============ Hero ============ */
.hero {
  background: var(--grad-hero);
  color: #F1F5F9;
  padding: 72px 0 64px;
  position: relative;
  overflow: hidden;
  border-bottom: none;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 85% 15%, rgba(253, 230, 138, 0.18), transparent 70%),
    radial-gradient(500px 320px at 10% 90%, rgba(96, 165, 250, 0.22), transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero h1 {
  color: #FFFFFF;
  font-size: 2.4rem;
  margin-bottom: 1rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  animation: heroFadeUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero p {
  color: #E2E8F0;
  font-size: 1.1rem;
  max-width: 760px;
  margin-bottom: 1.4rem;
  animation: heroFadeUp 0.9s 0.1s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero .kw {
  color: #FDE68A;
  font-weight: 700;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  animation: heroFadeUp 1s 0.2s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.btn-primary {
  background: #FFFFFF;
  color: #1E3A8A;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.btn-primary:hover {
  background: #FDE68A;
  color: #1E3A8A;
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.32);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #FFFFFF;
  border: 2px solid rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: #FFFFFF;
  color: #1E3A8A;
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
}

.hero-stats {
  display: flex;
  gap: 36px;
  margin-top: 2.4rem;
  flex-wrap: wrap;
  animation: heroFadeUp 1.1s 0.3s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-stats .stat {
  color: #E2E8F0;
  font-size: 0.92rem;
  letter-spacing: 0.5px;
}

.hero-stats .num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: #FDE68A;
  line-height: 1.2;
}

.hero-bg-deco {
  position: absolute;
  right: -80px;
  top: -60px;
  opacity: 0.18;
  width: 520px;
  height: 520px;
  animation: slowSpin 60s linear infinite;
  pointer-events: none;
}

@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slowSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  font-size: 0.88rem;
  color: var(--text-mute);
  padding: 14px 0 0;
}

.breadcrumb a {
  color: var(--link);
}

.breadcrumb span {
  color: var(--text-mute);
}

/* ============ Carousel ============ */
.carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
}

.carousel-track {
  display: flex;
  transition: transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
}

.carousel-slide {
  min-width: 100%;
  position: relative;
}

.carousel-slide svg {
  width: 100%;
  height: auto;
  display: block;
}

.carousel-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0));
  padding: 28px 32px 22px;
  color: #FFFFFF;
}

.carousel-caption h3 {
  color: #FFFFFF;
  font-size: 1.3rem;
  margin-bottom: 0.3rem;
}

.carousel-caption p {
  color: #E2E8F0;
  margin: 0;
  font-size: 0.95rem;
}

.carousel-dots {
  position: absolute;
  bottom: 12px;
  right: 20px;
  display: flex;
  gap: 8px;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  padding: 0;
  transition: background 0.25s ease, transform 0.25s ease, width 0.3s ease;
}

.carousel-dots button:hover {
  background: rgba(255, 255, 255, 0.85);
  transform: scale(1.15);
}

.carousel-dots button.active {
  background: #FDE68A;
  width: 24px;
  border-radius: 999px;
}

/* ============ Grids ============ */
.grid {
  display: grid;
  gap: 22px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ============ Cards ============ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--brand);
  box-shadow: var(--shadow-lg);
}

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

.card h3 {
  color: var(--text-main);
}

.card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.card .meta {
  color: var(--text-mute);
  font-size: 0.85rem;
}

.card .read {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--link);
  display: inline-block;
  transition: transform 0.25s ease, color 0.25s ease;
}

.card .read:hover {
  transform: translateX(4px);
  text-decoration: none;
  color: var(--link-hover);
}

/* ============ Article list ============ */
.article-item {
  display: flex;
  gap: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.article-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--grad-brand);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.article-item:hover {
  transform: translateY(-4px);
  border-color: var(--brand);
  box-shadow: var(--shadow-lg);
}

.article-item:hover::after {
  transform: scaleY(1);
}

.article-item svg {
  flex-shrink: 0;
  width: 120px;
  height: 90px;
  border-radius: var(--radius-sm);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.article-item:hover svg {
  transform: scale(1.04);
}

.article-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.article-item .date {
  color: var(--text-mute);
  font-size: 0.82rem;
  margin-bottom: 0.4rem;
}

.article-item p {
  color: var(--text-sub);
  font-size: 0.92rem;
  margin-bottom: 0.5rem;
}

.article-item .read {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--link);
  display: inline-block;
  transition: transform 0.25s ease;
}

.article-item .read:hover {
  transform: translateX(4px);
  text-decoration: none;
}

/* ============ FAQ ============ */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

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

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

.faq-q {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: inherit;
  transition: color 0.22s ease, background 0.22s ease;
}

.faq-q:hover {
  color: var(--brand);
  background: var(--grad-soft);
}

.faq-q .icon {
  color: var(--brand);
  font-weight: 800;
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.faq-item.open .faq-q .icon {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), padding 0.4s ease;
  padding: 0 20px;
  color: var(--text-sub);
  font-size: 0.95rem;
}

.faq-item.open .faq-a {
  max-height: 460px;
  padding: 0 20px 16px;
}

.faq-a p {
  color: var(--text-sub);
  margin: 0;
}

/* ============ HowTo ============ */
.howto-step {
  display: flex;
  gap: 16px;
  margin-bottom: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.howto-step:hover {
  background: var(--grad-soft);
  border-color: var(--border);
  transform: translateX(4px);
}

.howto-step .step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--grad-brand);
  color: var(--btn-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.05rem;
  box-shadow: 0 6px 16px rgba(29, 78, 216, 0.35);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.howto-step:hover .step-num {
  transform: scale(1.1) rotate(-6deg);
}

.howto-step h4 {
  margin-bottom: 0.2rem;
  color: var(--text-main);
}

.howto-step p {
  color: var(--text-sub);
  font-size: 0.94rem;
  margin: 0;
}

/* ============ Testimonials ============ */
.testimonial {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}

.testimonial::before {
  content: "\201C";
  position: absolute;
  top: -6px;
  right: 14px;
  font-size: 4rem;
  line-height: 1;
  color: var(--brand);
  opacity: 0.14;
  font-family: Georgia, serif;
}

.testimonial:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-left-color: var(--accent-warm);
}

.testimonial p {
  color: var(--text-sub);
  font-style: italic;
  font-size: 0.95rem;
}

.testimonial .who {
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.9rem;
  margin-top: 0.6rem;
  font-style: normal;
}

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.contact-info p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.contact-info strong {
  color: var(--text-main);
}

form.contact-form input,
form.contact-form textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text-main);
  font-size: 0.95rem;
  margin-bottom: 12px;
  font-family: inherit;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

form.contact-form input:focus,
form.contact-form textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.16);
  background: var(--bg-card);
}

form.contact-form input::placeholder,
form.contact-form textarea::placeholder {
  color: var(--text-mute);
}

form.contact-form button {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 26px;
  font-weight: 700;
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
  transition: background 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

form.contact-form button:hover {
  background: var(--btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(29, 78, 216, 0.35);
}

/* ============ Sitemap & Links ============ */
.sitemap ul {
  list-style: none;
  columns: 2;
  column-gap: 30px;
}

.sitemap li {
  margin-bottom: 8px;
}

.sitemap a {
  color: var(--link);
  font-size: 0.95rem;
  position: relative;
  transition: color 0.22s ease, padding-left 0.22s ease;
}

.sitemap a:hover {
  padding-left: 6px;
  text-decoration: none;
  color: var(--link-hover);
}

.friend-links a {
  display: inline-block;
  margin: 0 14px 10px 0;
  color: var(--link);
  font-size: 0.92rem;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.friend-links a:hover {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
  text-decoration: none;
  transform: translateY(-2px);
}

/* ============ Footer ============ */
footer.site-footer {
  background:
    radial-gradient(700px 340px at 12% 0%, rgba(29, 78, 216, 0.28), transparent 68%),
    radial-gradient(600px 320px at 92% 10%, rgba(96, 165, 250, 0.18), transparent 70%),
    var(--footer-bg);
  color: var(--footer-text);
  padding: 48px 0 24px;
  margin-top: 0;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
}

footer.site-footer h4 {
  color: #FFFFFF;
  font-size: 1rem;
  margin-bottom: 0.8rem;
  position: relative;
  padding-bottom: 8px;
}

footer.site-footer h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 999px;
  background: var(--grad-accent);
}

footer.site-footer p,
footer.site-footer li,
footer.site-footer a {
  color: var(--footer-mute);
  font-size: 0.9rem;
}

footer.site-footer a {
  transition: color 0.22s ease, padding-left 0.22s ease;
}

footer.site-footer a:hover {
  color: #FDE68A;
  text-decoration: none;
  padding-left: 4px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 30px;
  margin-bottom: 30px;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid li {
  margin-bottom: 8px;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 18px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--footer-mute);
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--footer-mute);
}

.footer-bottom a:hover {
  color: #FDE68A;
  text-decoration: none;
}

/* ============ Back to top ============ */
#backTop {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--grad-brand);
  color: var(--btn-text);
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  display: none;
  z-index: 999;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease;
}

#backTop:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 18px 40px rgba(29, 78, 216, 0.5);
}

/* ============ Reveal animation ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ============ Table ============ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}

th,
td {
  border: 1px solid var(--border);
  padding: 11px 14px;
  text-align: left;
  font-size: 0.93rem;
}

th {
  background: var(--grad-soft);
  color: var(--text-main);
  font-weight: 700;
}

td {
  color: var(--text-sub);
}

tbody tr {
  transition: background 0.22s ease;
}

tbody tr:hover {
  background: var(--grad-soft);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--brand);
  border-radius: 999px;
  border: 2px solid var(--bg-soft);
}

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

/* ============ Selection ============ */
::selection {
  background: var(--brand);
  color: #fff;
}

/* ============ Focus visible ============ */
:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 2rem; }
}

@media (max-width: 720px) {
  nav.main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    padding: 14px 20px;
    box-shadow: var(--shadow-lg);
    animation: navDrop 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
  }

  nav.main-nav.open {
    display: block;
  }

  nav.main-nav ul {
    flex-direction: column;
    gap: 12px;
  }

  nav.main-nav a::after {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .search-box {
    display: none;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 52px 0 46px;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 22px;
  }

  .hero-stats .num {
    font-size: 1.5rem;
  }

  .hero-bg-deco {
    width: 320px;
    height: 320px;
    right: -100px;
  }

  section {
    padding: 42px 0;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .sitemap ul {
    columns: 1;
  }

  .article-item {
    flex-direction: column;
  }

  .article-item svg {
    width: 100%;
    height: 150px;
  }

  .carousel-caption {
    padding: 18px 20px 16px;
  }

  .carousel-caption h3 {
    font-size: 1.05rem;
  }

  .carousel-caption p {
    font-size: 0.85rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  #backTop {
    right: 16px;
    bottom: 18px;
    width: 42px;
    height: 42px;
  }
}

@keyframes navDrop {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  header.site-header,
  #backTop,
  .carousel-dots,
  .theme-toggle,
  .menu-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }
}