:root {
  --primary: #1a5fb4;
  --primary-light: #2d7dd2;
  --primary-lighter: #48a0e8;
  --primary-dark: #1a3c66;
  --bg: #f7f9fc;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.55);
  --text: #2c3e50;
  --text-soft: #3d4d5c;
  --text-muted: #5a6b7b;
  --text-faint: #8a9aab;
  --border: #eaf0f7;
  --border-soft: #d5dde8;
  --shadow-sm: 0 2px 10px rgba(26, 95, 180, 0.05);
  --shadow-md: 0 2px 12px rgba(26, 95, 180, 0.07);
  --shadow-lg: 0 4px 18px rgba(26, 95, 180, 0.08);
  --shadow-xl: 0 10px 32px rgba(26, 95, 180, 0.14);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 20px;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-hero: linear-gradient(135deg, #1a5fb4 0%, #2d7dd2 55%, #48a0e8 100%);
  --gradient-accent: linear-gradient(120deg, #1a5fb4 0%, #48a0e8 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(72, 160, 232, 0.08), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(26, 95, 180, 0.07), transparent 46%);
  background-attachment: fixed;
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary-lighter);
  outline-offset: 2px;
}

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

button {
  font-family: inherit;
}

::selection {
  background: rgba(45, 125, 210, 0.25);
  color: var(--primary-dark);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(26, 95, 180, 0.28);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(26, 95, 180, 0.5);
  background-clip: content-box;
}

/* ============ HEADER ============ */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(26, 95, 180, 0.08);
  box-shadow: 0 2px 20px rgba(26, 95, 180, 0.08);
  transition: background-color var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--primary);
  white-space: nowrap;
  transition: transform var(--transition);
}

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

.logo svg {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: 0 4px 12px rgba(26, 95, 180, 0.28);
  transition: box-shadow var(--transition), transform var(--transition);
}

.logo:hover svg {
  box-shadow: 0 6px 18px rgba(26, 95, 180, 0.4);
  transform: rotate(-3deg) scale(1.04);
}

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

nav.main-nav a {
  position: relative;
  font-size: 15px;
  color: var(--text-soft);
  padding: 6px 0;
  white-space: nowrap;
  transition: color var(--transition);
}

nav.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

nav.main-nav a:hover {
  color: var(--primary);
  text-decoration: none;
}

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

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: rgba(247, 249, 252, 0.85);
  transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.search-box:focus-within {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(45, 125, 210, 0.15);
  background: #fff;
}

.search-box input {
  border: none;
  outline: none;
  background: transparent;
  padding: 6px 12px;
  font-size: 14px;
  width: 150px;
  color: var(--text);
  transition: width var(--transition);
}

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

.search-box button {
  border: none;
  background: var(--gradient-accent);
  color: #fff;
  padding: 6px 14px;
  cursor: pointer;
  font-size: 14px;
  transition: filter var(--transition);
}

.search-box button:hover {
  filter: brightness(1.08);
}

.theme-btn {
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  border-radius: var(--radius-pill);
  padding: 5px 14px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-soft);
  transition: all var(--transition);
}

.theme-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  box-shadow: 0 2px 10px rgba(45, 125, 210, 0.18);
  transform: translateY(-1px);
}

.menu-btn {
  display: none;
  border: none;
  background: var(--gradient-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  transition: filter var(--transition), transform var(--transition);
}

.menu-btn:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

/* ============ BREADCRUMB ============ */
.breadcrumb {
  max-width: 1200px;
  margin: 16px auto 0;
  padding: 0 20px;
  font-size: 13px;
  color: var(--text-faint);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.breadcrumb a {
  color: var(--text-faint);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--primary);
  text-decoration: none;
}

.breadcrumb span {
  margin: 0 6px;
}

/* ============ MAIN ============ */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

/* ============ HERO ============ */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
  color: #fff;
  border-radius: var(--radius-lg);
  margin-top: 18px;
  padding: 48px 40px;
  box-shadow: 0 18px 44px -12px rgba(26, 95, 180, 0.45);
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.22), transparent 38%),
    radial-gradient(circle at 8% 92%, rgba(255, 255, 255, 0.12), transparent 40%);
  z-index: -1;
}

.hero::after {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  right: -90px;
  top: -110px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 68%);
  animation: heroFloat 9s ease-in-out infinite;
  z-index: -1;
}

@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-18px, 22px) scale(1.08); }
}

.hero h1 {
  font-size: 32px;
  line-height: 1.4;
  margin-bottom: 16px;
  font-weight: 700;
  letter-spacing: 0.2px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.hero p.lead {
  font-size: 16px;
  max-width: 820px;
  opacity: 0.95;
  margin-bottom: 24px;
  line-height: 1.9;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.hero-tags span {
  background: rgba(255, 255, 255, 0.18);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  transition: background-color var(--transition), transform var(--transition);
}

.hero-tags span:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-cta a {
  background: #fff;
  color: var(--primary);
  padding: 11px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.14);
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.hero-cta a:hover {
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.22);
}

.hero-cta a.ghost {
  background: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  color: #fff;
  box-shadow: none;
}

.hero-cta a.ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.18);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 34px;
  flex-wrap: wrap;
}

.hero-stats div {
  text-align: left;
}

.hero-stats strong {
  display: block;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.hero-stats small {
  font-size: 13px;
  opacity: 0.85;
}

/* ============ CAROUSEL ============ */
.carousel {
  margin-top: 26px;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  transition: box-shadow var(--transition), background-color var(--transition);
}

.carousel:hover {
  box-shadow: var(--shadow-xl);
}

.slides {
  display: flex;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.slide {
  min-width: 100%;
  padding: 34px 40px;
  display: flex;
  gap: 26px;
  align-items: center;
}

.slide svg {
  width: 96px;
  height: 96px;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.slide:hover svg {
  transform: scale(1.06) rotate(2deg);
}

.slide h3 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--primary);
}

.slide p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.85;
}

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

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--border-soft);
  cursor: pointer;
  padding: 0;
  transition: background-color var(--transition), transform var(--transition), width var(--transition);
}

.carousel-dots button:hover {
  transform: scale(1.25);
}

.carousel-dots button.active {
  background: var(--primary);
  width: 24px;
  border-radius: 6px;
}

/* ============ SECTION BLOCKS ============ */
section.block {
  margin-top: 46px;
}

section.block > h2 {
  font-size: 24px;
  color: var(--primary-dark);
  border-left: 5px solid var(--primary);
  padding-left: 14px;
  margin-bottom: 20px;
  line-height: 1.5;
  position: relative;
  transition: color var(--transition);
}

section.block > h3 {
  font-size: 18px;
  color: var(--primary);
  margin: 26px 0 10px;
  line-height: 1.6;
}

section.block > h4 {
  font-size: 16px;
  color: var(--text);
  margin: 18px 0 8px;
}

section.block p {
  margin-bottom: 14px;
  font-size: 15px;
  color: var(--text-soft);
  text-align: justify;
  line-height: 1.9;
}

/* ============ GRIDS ============ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ============ CARDS ============ */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(72, 160, 232, 0.06), transparent 55%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(72, 160, 232, 0.4);
}

.card:hover::before {
  opacity: 1;
}

.card h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.85;
  position: relative;
  z-index: 1;
}

.card svg {
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  transition: transform var(--transition);
}

.card:hover svg {
  transform: scale(1.08) rotate(-3deg);
}

/* ============ ARTICLES ============ */
.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.article-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
  position: relative;
}

.article-item::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.article-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(72, 160, 232, 0.35);
}

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

.article-item h4 {
  font-size: 16px;
  color: var(--primary-dark);
  margin-bottom: 8px;
  line-height: 1.6;
  transition: color var(--transition);
}

.article-item:hover h4 {
  color: var(--primary);
}

.article-item .meta {
  font-size: 12px;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.article-item p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.8;
}

.article-item a {
  font-size: 14px;
  font-weight: 600;
  display: inline-block;
  transition: transform var(--transition), color var(--transition);
}

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

/* ============ FAQ ============ */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.faq-item:hover {
  border-color: rgba(72, 160, 232, 0.4);
  box-shadow: var(--shadow-sm);
}

.faq-item.open {
  border-color: rgba(72, 160, 232, 0.55);
  box-shadow: var(--shadow-md);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color var(--transition), background-color var(--transition);
}

.faq-q:hover {
  color: var(--primary);
}

.faq-q::after {
  content: "+";
  font-size: 20px;
  color: var(--primary);
  font-weight: 400;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-item.open .faq-q::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 20px;
}

.faq-item.open .faq-a {
  max-height: 400px;
  padding-bottom: 16px;
}

.faq-a p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.85;
}

/* ============ HOWTO ============ */
.howto-step {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(72, 160, 232, 0.4);
}

.howto-step .num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(26, 95, 180, 0.3);
  transition: transform var(--transition);
}

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

.howto-step h4 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--primary-dark);
}

.howto-step p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.8;
}

/* ============ CASES ============ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.case-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 22px;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
  position: relative;
  overflow: hidden;
}

.case-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(72, 160, 232, 0.35);
}

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

.case-card h4 {
  font-size: 15px;
  color: var(--primary);
  margin-bottom: 8px;
}

.case-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.8;
}

/* ============ TESTIMONIAL ============ */
.testimonial {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 22px;
  border-left: 4px solid var(--primary);
  font-size: 14px;
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
  line-height: 1.85;
}

.testimonial:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-left-color: var(--primary-lighter);
}

.testimonial cite {
  display: block;
  margin-top: 12px;
  font-style: normal;
  font-size: 13px;
  color: var(--text-faint);
}

/* ============ AUTHOR BOX ============ */
.author-box {
  background: linear-gradient(135deg, rgba(238, 244, 251, 0.95), rgba(226, 238, 250, 0.9));
  border: 1px solid rgba(72, 160, 232, 0.25);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin-top: 26px;
  transition: background-color var(--transition), border-color var(--transition);
}

.author-box svg {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  border-radius: 50%;
  box-shadow: 0 6px 16px rgba(26, 95, 180, 0.25);
}

.author-box h4 {
  font-size: 15px;
  color: var(--primary-dark);
  margin-bottom: 6px;
}

.author-box p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.85;
}

/* ============ CONTACT ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.contact-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}

.contact-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(72, 160, 232, 0.4);
}

.contact-item h4 {
  font-size: 15px;
  color: var(--primary);
  margin-bottom: 8px;
}

.contact-item p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.8;
}

/* ============ FOOTER ============ */
footer.site-footer {
  background: linear-gradient(160deg, #12243a 0%, #0d1a2b 100%);
  color: #b8c6d6;
  padding: 46px 20px 24px;
  margin-top: 60px;
  position: relative;
  overflow: hidden;
}

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

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
}

footer h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 14px;
}

footer ul {
  list-style: none;
}

footer li {
  margin-bottom: 9px;
  font-size: 13px;
}

footer a {
  color: #b8c6d6;
  font-size: 13px;
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 30px auto 0;
  padding-top: 20px;
  border-top: 1px solid #24384f;
  font-size: 12px;
  color: #8a9aab;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ============ BACK TOP ============ */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 30px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 20px;
  box-shadow: 0 6px 20px rgba(26, 95, 180, 0.45);
  display: none;
  z-index: 900;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.back-top.show {
  display: block;
  animation: backTopIn 0.3s ease;
}

@keyframes backTopIn {
  from { opacity: 0; transform: translateY(14px) scale(0.85); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.back-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 10px 28px rgba(26, 95, 180, 0.6);
}

/* ============ REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s cubic-bezier(0.4, 0, 0.2, 1), transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ SITEMAP LINKS ============ */
.sitemap-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  font-size: 14px;
}

.sitemap-links a {
  color: var(--primary);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(26, 95, 180, 0.06);
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
}

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

/* ============ LEGAL ============ */
.legal {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 22px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.legal:hover {
  box-shadow: var(--shadow-sm);
}

.legal h4 {
  font-size: 15px;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.legal p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.85;
}

/* ============ DARK MODE ============ */
body.dark {
  --bg: #0f1a26;
  --bg-card: #16253a;
  --bg-glass: rgba(22, 37, 58, 0.78);
  --bg-glass-border: rgba(36, 56, 79, 0.7);
  --text: #c8d4e0;
  --text-soft: #a8b8c8;
  --text-muted: #a8b8c8;
  --text-faint: #7d8fa3;
  --border: #24384f;
  --border-soft: #2b425c;
  --primary: #6fb3f2;
  --primary-light: #5aa6ee;
  --primary-lighter: #4a97e6;
  --primary-dark: #8cc6f7;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 4px 18px rgba(0, 0, 0, 0.45);
  --shadow-xl: 0 10px 32px rgba(0, 0, 0, 0.55);
  color: var(--text);
  background: #0f1a26;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(72, 160, 232, 0.1), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(26, 95, 180, 0.12), transparent 46%);
}

body.dark header.site-header {
  background: var(--bg-glass);
  border-bottom-color: rgba(111, 179, 242, 0.12);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

body.dark .logo {
  color: var(--primary);
}

body.dark nav.main-nav a {
  color: var(--text);
}

body.dark nav.main-nav a:hover {
  color: var(--primary);
}

body.dark nav.main-nav.open {
  background: var(--bg-card);
}

body.dark .search-box {
  background: rgba(22, 37, 58, 0.9);
  border-color: var(--border-soft);
}

body.dark .search-box:focus-within {
  background: #1b2c44;
}

body.dark .search-box input {
  color: var(--text);
}

body.dark .search-box input::placeholder {
  color: var(--text-faint);
}

body.dark .theme-btn {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border-soft);
}

body.dark .theme-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

body.dark .breadcrumb,
body.dark .breadcrumb a {
  color: var(--text-faint);
}

body.dark .breadcrumb a:hover {
  color: var(--primary);
}

body.dark .card,
body.dark .article-item,
body.dark .faq-item,
body.dark .faq-q,
body.dark .howto-step,
body.dark .case-card,
body.dark .testimonial,
body.dark .contact-item,
body.dark .legal,
body.dark .carousel {
  background: var(--bg-card);
  border-color: var(--border);
}

body.dark section.block > h2,
body.dark .card h4,
body.dark .article-item h4,
body.dark .faq-q,
body.dark .howto-step h4,
body.dark .case-card h4,
body.dark .contact-item h4,
body.dark .legal h4,
body.dark .author-box h4 {
  color: var(--primary);
}

body.dark section.block > h2 {
  border-left-color: var(--primary);
}

body.dark section.block p,
body.dark .card p,
body.dark .article-item p,
body.dark .faq-a p,
body.dark .howto-step p,
body.dark .case-card p,
body.dark .contact-item p,
body.dark .legal p,
body.dark .testimonial {
  color: var(--text-muted);
}

body.dark .article-item:hover h4 {
  color: var(--primary);
}

body.dark .author-box {
  background: linear-gradient(135deg, rgba(22, 37, 58, 0.95), rgba(26, 45, 68, 0.9));
  border-color: rgba(111, 179, 242, 0.25);
}

body.dark .sitemap-links a {
  background: rgba(111, 179, 242, 0.1);
  color: var(--primary);
}

body.dark .sitemap-links a:hover {
  background: var(--primary);
  color: #0f1a26;
}

body.dark .card::before {
  background: linear-gradient(135deg, rgba(111, 179, 242, 0.08), transparent 55%);
}

body.dark .faq-item.open {
  border-color: rgba(111, 179, 242, 0.5);
}

body.dark .hero {
  box-shadow: 0 18px 44px -12px rgba(0, 0, 0, 0.6);
}

body.dark ::-webkit-scrollbar-thumb {
  background: rgba(111, 179, 242, 0.3);
  background-clip: content-box;
}

body.dark ::-webkit-scrollbar-thumb:hover {
  background: rgba(111, 179, 242, 0.5);
  background-clip: content-box;
}

body.dark ::selection {
  background: rgba(111, 179, 242, 0.3);
  color: #fff;
}

/* ============ RESPONSIVE: TABLET ============ */
@media (max-width: 900px) {
  .grid-3,
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .article-list {
    grid-template-columns: 1fr;
  }

  nav.main-nav ul {
    gap: 16px;
  }

  nav.main-nav a {
    font-size: 14px;
  }

  .search-box input {
    width: 120px;
  }

  .hero {
    padding: 40px 32px;
  }

  .hero h1 {
    font-size: 28px;
  }
}

/* ============ RESPONSIVE: MOBILE ============ */
@media (max-width: 640px) {
  html {
    scroll-padding-top: 72px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    height: 60px;
    padding: 0 14px;
    gap: 10px;
  }

  .logo {
    font-size: 16px;
  }

  .logo svg {
    width: 30px;
    height: 30px;
  }

  nav.main-nav {
    display: none;
  }

  nav.main-nav.open {
    display: block;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.14);
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    animation: navDrop 0.28s ease;
  }

  @keyframes navDrop {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  nav.main-nav.open ul {
    flex-direction: column;
    gap: 4px;
    align-items: stretch;
  }

  nav.main-nav.open a {
    display: block;
    padding: 10px 4px;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
  }

  nav.main-nav.open li:last-child a {
    border-bottom: none;
  }

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

  .menu-btn {
    display: block;
  }

  .search-box {
    display: none;
  }

  .breadcrumb {
    margin-top: 12px;
    padding: 0 14px;
    font-size: 12px;
  }

  main {
    padding: 0 14px 46px;
  }

  .hero {
    padding: 30px 20px;
    border-radius: var(--radius-md);
    margin-top: 14px;
  }

  .hero h1 {
    font-size: 22px;
    line-height: 1.45;
  }

  .hero p.lead {
    font-size: 14px;
    line-height: 1.85;
  }

  .hero-cta {
    gap: 10px;
  }

  .hero-cta a {
    padding: 10px 20px;
    font-size: 14px;
    flex: 1 1 auto;
    text-align: center;
  }

  .hero-stats {
    gap: 22px;
    margin-top: 26px;
  }

  .hero-stats strong {
    font-size: 22px;
  }

  .hero-stats small {
    font-size: 12px;
  }

  .carousel {
    border-radius: var(--radius-md);
    margin-top: 18px;
  }

  .slide {
    flex-direction: column;
    text-align: center;
    padding: 26px 22px 40px;
    gap: 16px;
  }

  .slide svg {
    width: 72px;
    height: 72px;
  }

  .slide h3 {
    font-size: 17px;
  }

  .carousel-dots {
    right: 50%;
    transform: translateX(50%);
    bottom: 12px;
  }

  section.block {
    margin-top: 34px;
  }

  section.block > h2 {
    font-size: 19px;
    padding-left: 12px;
    border-left-width: 4px;
    margin-bottom: 16px;
  }

  section.block > h3 {
    font-size: 16px;
    margin-top: 22px;
  }

  section.block > h4 {
    font-size: 15px;
  }

  section.block p {
    font-size: 14px;
  }

  .grid-3,
  .grid-2,
  .case-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .card {
    padding: 20px;
  }

  .article-item {
    padding: 18px;
  }

  .article-item::after {
    left: 18px;
    right: 18px;
  }

  .howto-step {
    padding: 16px;
    gap: 12px;
  }

  .howto-step:hover {
    transform: translateY(-2px);
  }

  .author-box {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px;
  }

  .testimonial {
    padding: 18px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  footer.site-footer {
    padding: 34px 16px 20px;
    margin-top: 44px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 6px;
  }

  .back-top {
    right: 16px;
    bottom: 20px;
    width: 42px;
    height: 42px;
    font-size: 18px;
  }

  .sitemap-links {
    gap: 10px 12px;
  }

  .sitemap-links a {
    font-size: 13px;
    padding: 4px 10px;
  }
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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

/* ============ PRINT ============ */
@media print {
  header.site-header,
  .back-top,
  .carousel,
  .hero-cta,
  .hero-stats,
  .search-box,
  .theme-btn,
  .menu-btn {
    display: none !important;
  }

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

  .hero {
    background: #fff;
    color: #000;
    box-shadow: none;
    border: 1px solid #ccc;
  }

  .card,
  .article-item,
  .faq-item,
  .howto-step,
  .case-card,
  .testimonial,
  .contact-item,
  .legal {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }

  .faq-a {
    max-height: none !important;
    padding-bottom: 16px !important;
  }
}