/* Otter 中文站全局样式 — 语义化 HTML + 原生 CSS */
:root {
  --emerald-50: #ecfdf5;
  --emerald-100: #d1fae5;
  --emerald-200: #a7f3d0;
  --emerald-300: #6ee7b7;
  --emerald-400: #34d399;
  --emerald-500: #10b981;
  --emerald-600: #059669;
  --emerald-700: #047857;
  --teal-50: #f0fdfa;
  --teal-200: #99f6e4;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --shadow-sm: 0 1px 3px rgba(17, 24, 39, 0.08);
  --shadow-md: 0 12px 28px rgba(17, 24, 39, 0.08);
  --shadow-xl: 0 24px 60px rgba(5, 150, 105, 0.14);
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --container: 72rem;
  --header-height: 76px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

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

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

body {
  margin: 0;
  color: var(--gray-900);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

img {
  height: auto;
}

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

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
  letter-spacing: -0.025em;
}

p {
  margin-bottom: 0;
}

ul,
ol {
  padding-left: 1.35rem;
}

:focus-visible {
  outline: 3px solid var(--emerald-400);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  padding: 0.65rem 1rem;
  color: var(--gray-900);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-right: 1rem;
  padding-left: 1rem;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--gray-100);
  box-shadow: 0 4px 20px rgba(17, 24, 39, 0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.brand small {
  display: block;
  color: var(--gray-500);
  font-size: 0.68rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.04em;
}

.brand strong {
  font-size: 1.08rem;
  line-height: 1.2;
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: 0.2rem;
}

.nav-link {
  padding: 0.58rem 0.86rem;
  color: var(--gray-600);
  border-radius: var(--radius-lg);
  font-size: 0.94rem;
  font-weight: 600;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover {
  color: var(--gray-900);
  background: var(--gray-50);
}

.nav-link.is-active {
  color: var(--emerald-700);
  background: var(--emerald-50);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.header-cta {
  display: none;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 48px;
  padding: 0.78rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius-xl);
  font-weight: 700;
  line-height: 1.2;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease,
    border-color 0.2s ease;
}

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

.button-primary {
  color: var(--white);
  background: var(--emerald-600);
  box-shadow: 0 10px 24px rgba(5, 150, 105, 0.24);
}

.button-primary:hover {
  background: var(--emerald-700);
  box-shadow: 0 14px 30px rgba(5, 150, 105, 0.3);
}

.button-hero {
  min-height: 58px;
  padding: 1rem 2rem;
  border-radius: var(--radius-2xl);
  font-size: 1.08rem;
  animation: glow 3.2s ease-in-out infinite;
}

.button-secondary {
  color: var(--gray-700);
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--gray-200);
}

.button-secondary:hover {
  color: var(--emerald-700);
  background: var(--white);
  border-color: var(--emerald-200);
}

.button-light {
  color: var(--emerald-700);
  background: var(--white);
}

.icon {
  width: 1.1em;
  height: 1.1em;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  cursor: pointer;
}

.mobile-menu {
  position: fixed;
  inset: var(--header-height) 0 auto;
  z-index: 99;
  display: none;
  padding: 0.75rem 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--gray-100);
  box-shadow: 0 20px 35px rgba(17, 24, 39, 0.1);
}

.mobile-menu.is-open {
  display: block;
}

.mobile-menu nav {
  display: grid;
  gap: 0.3rem;
}

.mobile-menu .nav-link {
  display: block;
  padding: 0.85rem 1rem;
}

.mobile-menu .button {
  margin-top: 0.6rem;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-height) + 3.5rem) 0 4.5rem;
  background:
    radial-gradient(circle at 90% 5%, rgba(153, 246, 228, 0.5), transparent 28rem),
    linear-gradient(135deg, #f8fffc 0%, #f0fdfa 52%, #ecfdf5 100%);
}

.hero::before,
.hero::after {
  position: absolute;
  z-index: 0;
  width: 26rem;
  height: 26rem;
  border-radius: 9999px;
  filter: blur(72px);
  opacity: 0.3;
  content: "";
  pointer-events: none;
}

.hero::before {
  top: -9rem;
  right: -6rem;
  background: var(--teal-200);
}

.hero::after {
  bottom: -13rem;
  left: -8rem;
  background: var(--emerald-300);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  align-items: center;
  gap: 3rem;
}

.hero-copy {
  max-width: 39rem;
  margin: 0 auto;
  text-align: center;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.4rem;
  padding: 0.48rem 0.9rem;
  color: var(--emerald-700);
  background: var(--emerald-100);
  border: 1px solid rgba(16, 185, 129, 0.14);
  border-radius: 9999px;
  font-size: 0.86rem;
  font-weight: 700;
}

.trust-badge .icon {
  width: 16px;
  height: 16px;
}

.hero h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.5rem, 6.5vw, 4.3rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.text-gradient {
  color: var(--emerald-600);
  background: linear-gradient(100deg, var(--emerald-600), #0d9488 60%, #0f766e);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  max-width: 37rem;
  margin: 0 auto 1.8rem;
  color: var(--gray-600);
  font-size: 1.13rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
}

.hero-note {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem 1rem;
  margin-top: 1.2rem;
  color: var(--gray-500);
  font-size: 0.82rem;
}

.hero-note span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.hero-note .icon {
  width: 14px;
  height: 14px;
  color: var(--emerald-600);
}

.hero-visual {
  position: relative;
  max-width: 40rem;
  margin: 0 auto;
}

.hero-visual::before {
  position: absolute;
  inset: 12% 7% -6%;
  z-index: -1;
  border-radius: 2.5rem;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(13, 148, 136, 0.08));
  filter: blur(25px);
  content: "";
}

.hero-visual img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 28px 45px rgba(6, 95, 70, 0.16));
}

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.7rem 0.9rem;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(229, 231, 235, 0.9);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  font-size: 0.75rem;
  font-weight: 600;
  backdrop-filter: blur(10px);
}

.floating-card strong {
  display: block;
  font-size: 0.78rem;
}

.floating-card small {
  display: block;
  color: var(--gray-500);
  font-size: 0.65rem;
  font-weight: 500;
}

.floating-card .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald-500);
  box-shadow: 0 0 0 4px var(--emerald-100);
}

.floating-card--top {
  top: 7%;
  left: -2%;
}

.floating-card--bottom {
  right: -1%;
  bottom: 5%;
}

.section {
  padding: 5rem 0;
}

.section-muted {
  background: var(--gray-50);
}

.section-dark {
  color: var(--white);
  background: var(--gray-900);
}

.section-heading {
  max-width: 43rem;
  margin: 0 auto 2.8rem;
  text-align: center;
}

.section-heading h2 {
  margin-bottom: 0.9rem;
  font-size: clamp(1.8rem, 4vw, 2.45rem);
  font-weight: 800;
}

.section-heading p {
  color: var(--gray-600);
  font-size: 1.06rem;
}

.section-dark .section-heading p {
  color: var(--gray-400);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.75rem;
  color: var(--emerald-600);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.stats {
  padding: 2.6rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 0.7rem;
  color: var(--emerald-400);
  background: rgba(16, 185, 129, 0.1);
  border-radius: 14px;
}

.stat-icon .icon {
  width: 25px;
  height: 25px;
}

.stat-value {
  display: block;
  margin-bottom: 0.25rem;
  font-size: clamp(1.8rem, 4vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.stat-label {
  color: var(--gray-400);
  font-size: 0.9rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.feature-card {
  position: relative;
  padding: 1.8rem;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-3xl);
  box-shadow: 0 1px 2px rgba(17, 24, 39, 0.02);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  border-color: var(--emerald-200);
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  margin-bottom: 1.25rem;
  color: var(--white);
  border-radius: var(--radius-2xl);
  transition: transform 0.25s ease;
}

.feature-card:hover .feature-icon {
  transform: scale(1.08);
}

.feature-icon .icon {
  width: 28px;
  height: 28px;
}

.gradient-purple {
  background: linear-gradient(135deg, #a855f7, #ec4899);
}

.gradient-cyan {
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
}

.gradient-amber {
  background: linear-gradient(135deg, #f59e0b, #f97316);
}

.gradient-emerald {
  background: linear-gradient(135deg, #10b981, #14b8a6);
}

.feature-card h3 {
  margin-bottom: 0.65rem;
  font-size: 1.3rem;
  font-weight: 800;
}

.feature-card p {
  color: var(--gray-600);
  font-size: 0.98rem;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.platform-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.6rem 0.85rem;
  text-align: center;
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-3xl);
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.platform-card:hover {
  border-color: var(--emerald-200);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.platform-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 0.85rem;
  color: var(--gray-700);
  transition: color 0.2s ease;
}

.platform-icon .icon {
  width: 36px;
  height: 36px;
}

.platform-card:hover .platform-icon {
  color: var(--emerald-600);
}

.platform-card h3 {
  margin-bottom: 0.2rem;
  font-size: 1.02rem;
  font-weight: 800;
}

.platform-card p {
  color: var(--gray-500);
  font-size: 0.78rem;
}

.platform-download {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.55rem;
  color: var(--emerald-600);
  font-size: 0.78rem;
  font-weight: 700;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.platform-card:hover .platform-download,
.platform-card:focus-within .platform-download {
  opacity: 1;
  transform: translateX(2px);
}

.platform-download .icon {
  width: 13px;
  height: 13px;
}

.articles-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2.2rem;
}

.articles-header .section-heading {
  margin: 0;
  text-align: left;
}

.articles-header .section-heading p {
  margin-top: 0.4rem;
}

.all-articles {
  display: none;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
  padding-bottom: 0.45rem;
  color: var(--emerald-700);
  font-size: 0.9rem;
  font-weight: 700;
}

.all-articles:hover {
  color: var(--emerald-600);
}

.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-2xl);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.article-card:hover {
  border-color: var(--emerald-200);
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.article-cover {
  position: relative;
  height: 11rem;
  overflow: hidden;
  background: var(--gray-100);
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.article-card:hover .article-cover img {
  transform: scale(1.045);
}

.article-tag {
  position: absolute;
  top: 0.8rem;
  left: 0.8rem;
  padding: 0.24rem 0.55rem;
  color: var(--white);
  background: var(--emerald-500);
  border-radius: var(--radius-lg);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.article-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 1.2rem 1.25rem 1rem;
}

.article-body h3 {
  margin-bottom: 0.55rem;
  font-size: 1.04rem;
  font-weight: 800;
  line-height: 1.45;
  transition: color 0.2s ease;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.article-card:hover .article-body h3 {
  color: var(--emerald-600);
}

.article-excerpt {
  margin-bottom: 1rem;
  color: var(--gray-500);
  font-size: 0.86rem;
  line-height: 1.65;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.75rem;
  color: var(--gray-400);
  border-top: 1px solid var(--gray-50);
  font-size: 0.7rem;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.article-meta .icon {
  width: 12px;
  height: 12px;
}

.faq-list {
  max-width: 48rem;
  margin: 0 auto;
  border-top: 1px solid var(--gray-200);
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 1rem;
  padding: 1.15rem 0;
  text-align: left;
  background: none;
  border: 0;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
}

.faq-question:hover {
  color: var(--emerald-700);
}

.faq-icon {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--gray-200);
  border-radius: 50%;
  transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.faq-icon::before,
.faq-icon::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 9px;
  height: 1.5px;
  background: currentColor;
  content: "";
  transform: translate(-50%, -50%);
}

.faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: opacity 0.2s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
  color: var(--white);
  background: var(--emerald-600);
  border-color: var(--emerald-600);
}

.faq-question[aria-expanded="true"] .faq-icon::after {
  opacity: 0;
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.faq-answer > div {
  overflow: hidden;
}

.faq-answer p {
  padding: 0 1.8rem 1.2rem 0;
  color: var(--gray-600);
  font-size: 0.93rem;
}

.faq-item.is-open .faq-answer {
  grid-template-rows: 1fr;
}

.cta-band {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: linear-gradient(120deg, #065f46, #059669 58%, #0f766e);
}

.cta-band::before,
.cta-band::after {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  content: "";
}

.cta-band::before {
  top: -8rem;
  right: 8%;
  width: 23rem;
  height: 23rem;
}

.cta-band::after {
  bottom: -12rem;
  left: 4%;
  width: 19rem;
  height: 19rem;
}

.cta-band-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3.4rem 1rem;
  text-align: center;
}

.cta-band h2 {
  max-width: 40rem;
  margin-bottom: 0.8rem;
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  font-weight: 800;
}

.cta-band p {
  max-width: 38rem;
  margin-bottom: 1.5rem;
  color: rgba(255, 255, 255, 0.82);
}

.site-footer {
  padding: 3.5rem 0 1.5rem;
  color: var(--white);
  background: var(--gray-900);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.footer-brand {
  grid-column: 1 / -1;
}

.footer-brand .brand {
  margin-bottom: 0.8rem;
}

.footer-brand .brand img {
  border-radius: 9px;
}

.footer-brand p {
  max-width: 22rem;
  color: var(--gray-400);
  font-size: 0.86rem;
}

.footer-column h3 {
  margin-bottom: 0.8rem;
  color: var(--gray-200);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.footer-column ul {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-column a {
  color: var(--gray-400);
  font-size: 0.82rem;
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--emerald-400);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  color: var(--gray-500);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
}

.footer-bottom p {
  margin: 0;
}

.page-main {
  padding-top: var(--header-height);
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 4.2rem 0 3.2rem;
  background:
    radial-gradient(circle at 92% 0%, rgba(153, 246, 228, 0.5), transparent 25rem),
    linear-gradient(135deg, #f8fffc, #f0fdfa);
  text-align: center;
}

.page-hero h1 {
  max-width: 50rem;
  margin: 0 auto 0.9rem;
  font-size: clamp(2rem, 5vw, 3.15rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.page-hero p {
  max-width: 43rem;
  margin: 0 auto;
  color: var(--gray-600);
  font-size: 1.04rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  color: var(--gray-500);
  font-size: 0.77rem;
}

.breadcrumb a:hover {
  color: var(--emerald-700);
}

.page-section {
  padding: 3.5rem 0 4.5rem;
}

.download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.download-card {
  padding: 1.5rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.download-card:hover {
  border-color: var(--emerald-200);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.download-card-top {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.download-card-top .platform-icon {
  width: 44px;
  height: 44px;
  margin: 0;
  color: var(--emerald-600);
}

.download-card-top .platform-icon .icon {
  width: 34px;
  height: 34px;
}

.download-card h2 {
  margin: 0;
  font-size: 1.16rem;
}

.download-card .version {
  color: var(--gray-500);
  font-size: 0.78rem;
}

.download-card p {
  margin-bottom: 1.1rem;
  color: var(--gray-600);
  font-size: 0.9rem;
}

.download-card .button {
  width: 100%;
}

.specs {
  display: grid;
  gap: 0.45rem;
  margin: 0 0 1.2rem;
  padding: 0;
  color: var(--gray-500);
  list-style: none;
  font-size: 0.8rem;
}

.specs li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px dashed var(--gray-100);
}

.specs strong {
  color: var(--gray-700);
  font-weight: 600;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.4rem;
}

.info-card {
  padding: 1.5rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-2xl);
}

.info-card h2 {
  margin-bottom: 0.6rem;
  font-size: 1.05rem;
}

.info-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.info-card ol {
  margin-bottom: 0;
  color: var(--gray-600);
  font-size: 0.9rem;
}

.info-card li + li {
  margin-top: 0.4rem;
}

.prose-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.prose {
  min-width: 0;
  color: var(--gray-700);
  font-size: 1rem;
  line-height: 1.9;
}

.prose h2 {
  margin: 2rem 0 0.8rem;
  color: var(--gray-900);
  font-size: 1.55rem;
  font-weight: 800;
}

.prose h3 {
  margin: 1.6rem 0 0.6rem;
  color: var(--gray-900);
  font-size: 1.15rem;
  font-weight: 800;
}

.prose p {
  margin-bottom: 1rem;
}

.prose a {
  color: var(--emerald-700);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose ul,
.prose ol {
  margin: 0 0 1.2rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  color: var(--gray-700);
  background: var(--emerald-50);
  border-left: 4px solid var(--emerald-500);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.prose blockquote p {
  margin: 0;
}

.prose table {
  width: 100%;
  margin: 1.2rem 0 1.6rem;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.prose th,
.prose td {
  padding: 0.7rem 0.8rem;
  text-align: left;
  border: 1px solid var(--gray-200);
}

.prose th {
  color: var(--gray-800);
  background: var(--gray-50);
}

.prose img {
  width: 100%;
  margin: 1.2rem 0;
  border-radius: var(--radius-2xl);
}

.article-hero {
  padding: 3.6rem 0 2.2rem;
  background: linear-gradient(135deg, #f8fffc, #f0fdfa);
  text-align: center;
}

.article-hero .breadcrumb {
  justify-content: center;
}

.article-hero h1 {
  max-width: 50rem;
  margin: 0 auto 1rem;
  font-size: clamp(1.9rem, 4.4vw, 2.85rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.article-hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.2rem;
  color: var(--gray-500);
  font-size: 0.8rem;
}

.article-hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.article-hero-meta .icon {
  width: 14px;
  height: 14px;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding: 2.5rem 0 4rem;
}

.article-aside {
  align-self: start;
  padding: 1.3rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-2xl);
}

.article-aside h2 {
  margin-bottom: 0.7rem;
  font-size: 1rem;
}

.article-aside p {
  margin-bottom: 1rem;
  color: var(--gray-600);
  font-size: 0.85rem;
}

.article-aside .button {
  width: 100%;
  min-height: 44px;
  font-size: 0.85rem;
}

.related-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-list a {
  color: var(--gray-600);
  font-size: 0.83rem;
}

.related-list a:hover {
  color: var(--emerald-700);
}

.notice {
  margin: 1.5rem 0;
  padding: 1rem 1.15rem;
  color: var(--gray-700);
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-xl);
  font-size: 0.88rem;
}

.steps {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding-left: 3rem;
  counter-increment: step;
}

.steps li::before {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  color: var(--white);
  background: var(--emerald-600);
  border-radius: 50%;
  font-size: 0.82rem;
  font-weight: 800;
  content: counter(step);
}

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

.contact-card {
  padding: 1.5rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
}

.contact-card h2 {
  margin-bottom: 0.7rem;
  font-size: 1.08rem;
}

.contact-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.contact-card a {
  color: var(--emerald-700);
  font-weight: 700;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@keyframes glow {
  0%,
  100% {
    box-shadow: 0 12px 28px rgba(5, 150, 105, 0.22);
  }
  50% {
    box-shadow: 0 16px 38px rgba(16, 185, 129, 0.4);
  }
}

@media (min-width: 768px) {
  .container {
    padding-right: 1.5rem;
    padding-left: 1.5rem;
  }

  .desktop-nav,
  .header-cta {
    display: flex;
  }

  .menu-toggle {
    display: none;
  }

  .section {
    padding: 6rem 0;
  }

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

  .stat-item + .stat-item {
    border-left: 1px solid rgba(255, 255, 255, 0.1);
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .platform-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .all-articles {
    display: inline-flex;
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .download-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .info-grid,
  .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta-band-inner {
    padding: 4.2rem 2rem;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding-top: calc(var(--header-height) + 5rem);
    padding-bottom: 6rem;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 3.2rem;
  }

  .hero-copy {
    margin: 0;
    text-align: left;
  }

  .hero-subtitle {
    margin-right: 0;
    margin-left: 0;
  }

  .hero-actions,
  .hero-note {
    justify-content: flex-start;
  }

  .hero-visual {
    margin: 0;
  }

  .platform-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .article-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .download-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .article-layout {
    grid-template-columns: minmax(0, 1fr) 17rem;
    gap: 3.5rem;
  }

  .article-aside {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
  }

  .prose-wrap {
    grid-template-columns: minmax(0, 1fr) 17rem;
    gap: 3rem;
  }

  .prose-wrap .article-aside {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
  }
}

@media (min-width: 1280px) {
  .article-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .desktop-nav {
    display: none;
  }

  .prose table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .floating-card--top {
    top: 2%;
    left: 0;
    transform: scale(0.9);
    transform-origin: left top;
  }

  .floating-card--bottom {
    right: 0;
    bottom: 1%;
    transform: scale(0.9);
    transform-origin: right bottom;
  }

  .articles-header {
    align-items: flex-start;
  }

  .article-cover {
    height: 12rem;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 2.35rem;
  }

  .hero-actions .button {
    width: 100%;
  }

  .floating-card {
    padding: 0.5rem 0.65rem;
    font-size: 0.68rem;
  }

  .floating-card strong {
    font-size: 0.7rem;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .header-inner {
    gap: 0.75rem;
  }

  .nav-link {
    padding: 0.5rem 0.6rem;
    font-size: 0.88rem;
  }

  .header-cta {
    padding-right: 0.9rem;
    padding-left: 0.9rem;
  }
}

@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;
  }
}