/* ===========================================
   NetNewsWire 中文推广站 - 主样式
   配色：蓝(主) + 黄(点缀) + 白
   =========================================== */

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #0F1A2E;
  background: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; display: block; }
a { color: #1E6FE0; text-decoration: none; transition: color .2s ease; }
a:hover { color: #0E52B5; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* === 颜色变量 === */
:root {
  --c-primary: #1E6FE0;
  --c-primary-dark: #0E52B5;
  --c-primary-light: #4A92F2;
  --c-accent: #F5C947;
  --c-accent-dark: #E0B02E;
  --c-text: #0F1A2E;
  --c-text-mid: #3F4A5E;
  --c-text-light: #7B8699;
  --c-bg: #FFFFFF;
  --c-bg-soft: #F7FAFC;
  --c-bg-blue: linear-gradient(135deg, #2E7BF0 0%, #1E6FE0 60%, #0E52B5 100%);
  --c-border: #E5EAF0;
  --c-border-strong: #D5DCE5;
  --shadow-sm: 0 1px 2px rgba(15, 26, 46, .06), 0 1px 3px rgba(15, 26, 46, .04);
  --shadow-md: 0 4px 12px rgba(15, 26, 46, .08), 0 2px 4px rgba(15, 26, 46, .04);
  --shadow-lg: 0 12px 32px rgba(15, 26, 46, .12), 0 4px 8px rgba(15, 26, 46, .06);
  --shadow-xl: 0 24px 60px rgba(30, 111, 224, .18), 0 8px 16px rgba(15, 26, 46, .08);
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
}

/* === 容器 === */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === 顶部导航 === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--c-text);
}
.brand img{max-width: 50px;}
.brand-logo {
  width: 32px;
  height: 32px;
  display: inline-block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--c-text-mid);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--c-primary);
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -22px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
}
.nav-cta {
  background: var(--c-primary);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}
.nav-cta:hover { background: var(--c-primary-dark); color: #fff !important; }
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 880px) {
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: #fff; border-bottom: 1px solid var(--c-border); padding: 12px 0; }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 24px; }
  .nav-links a.active::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-cta { display: none; }
}

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(30, 111, 224, .25);
}
.btn-primary:hover {
  background: var(--c-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(30, 111, 224, .32);
}
.btn-accent {
  background: var(--c-accent);
  color: #0F1A2E;
  box-shadow: 0 4px 12px rgba(245, 201, 71, .35);
}
.btn-accent:hover {
  background: var(--c-accent-dark);
  color: #0F1A2E;
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border-strong);
}
.btn-ghost:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}
.btn-lg { padding: 16px 36px; font-size: 16px; }

/* === Section 通用 === */
section { padding: 80px 0; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c-primary);
  background: rgba(30, 111, 224, .08);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.section-title {
  font-size: 36px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 16px;
}
.section-subtitle {
  font-size: 17px;
  color: var(--c-text-mid);
  margin: 0 0 56px;
  max-width: 720px;
}
.section-head { text-align: center; }
.section-head .section-subtitle { margin-left: auto; margin-right: auto; }

@media (max-width: 720px) {
  section { padding: 56px 0; }
  .section-title { font-size: 28px; }
  .section-subtitle { font-size: 16px; margin-bottom: 36px; }
}

/* === Footer === */
.footer {
  background: #0F1A2E;
  color: #B6C2D4;
  padding: 64px 0 32px;
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}
.footer-brand img{max-width: 50px;}
.footer-desc { font-size: 14px; line-height: 1.7; max-width: 320px; }
.footer-col h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 16px;
  letter-spacing: .04em;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: #B6C2D4;
  font-size: 14px;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #1F2C44;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-meta { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* === 下载弹窗 === */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 26, 46, .55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, visibility .25s ease;
  padding: 20px;
}
.modal-backdrop.open { opacity: 1; visibility: visible;  left: 0;
  right: 0;
  top: 0;
  bottom: 0;}
button { outline: none } 
.modal {
  background: #fff;
  border-radius: var(--r-lg);
  width: 100%;
  max-width: 520px;
  padding: 36px 32px 28px;
  box-shadow: var(--shadow-xl);
  transform: translateY(12px) scale(.98);
  transition: transform .25s ease;
  position: relative;
}
.modal-backdrop.open .modal { transform: translateY(0) scale(1); }
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-light);
  transition: background .2s;
}
.modal-close:hover { background: var(--c-bg-soft); color: var(--c-text); }
.modal-title {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 6px;
}
.modal-subtitle {
  text-align: center;
  color: var(--c-text-light);
  font-size: 14px;
  margin: 0 0 24px;
}
.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.qr-card {
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 18px 16px;
  text-align: center;
  transition: border-color .2s, transform .2s;
}
.qr-card:hover { border-color: var(--c-primary); transform: translateY(-2px); }
.qr-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #fff;
  border-radius: 6px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.qr-img svg { width: 100%; height: 100%; }
.qr-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 4px;
}
.qr-tag {
  font-size: 12px;
  color: var(--c-text-light);
}
@media (max-width: 520px) {
  .qr-grid { grid-template-columns: 1fr; }
  .modal { padding: 28px 22px 22px; }
}

/* === Hero (首页) === */
.hero {
  position: relative;
  background: var(--c-bg-blue);
  color: #fff;
  overflow: hidden;
  padding: 96px 0 80px;
}
.hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -120px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(245, 201, 71, .25), transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -160px;
  left: -120px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(74, 146, 242, .35), transparent 70%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .22);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  margin-bottom: 20px;
}
.hero-tag .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(245, 201, 71, .25);
}
.hero h1 {
  font-size: 52px;
  line-height: 1.15;
  font-weight: 800;
  margin: 0 0 20px;
  letter-spacing: -.01em;
}
.hero h1 .accent { color: var(--c-accent); }
.hero p.lead {
  font-size: 18px;
  line-height: 1.65;
  color: rgba(255, 255, 255, .88);
  margin: 0 0 32px;
  max-width: 540px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-meta {
  margin-top: 36px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, .82);
  font-size: 14px;
}
.hero-meta-item { display: flex; align-items: center; gap: 8px; }
.hero-meta-item svg { width: 18px; height: 18px; color: var(--c-accent); flex-shrink: 0; }

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-mockup {
  width: 100%;
  max-width: 520px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .28);
  overflow: hidden;
  color: var(--c-text);
}
.mockup-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: #F2F4F8;
  border-bottom: 1px solid var(--c-border);
}
.mockup-bar span {
  width: 12px; height: 12px; border-radius: 50%;
}
.mockup-bar span:nth-child(1) { background: #FF5F57; }
.mockup-bar span:nth-child(2) { background: #FEBC2E; }
.mockup-bar span:nth-child(3) { background: #28C840; }
.mockup-bar .title {
  margin-left: 10px; font-size: 12px; color: var(--c-text-light);
}
.mockup-body { display: grid; grid-template-columns: 200px 1fr; min-height: 320px; }
.mockup-side {
  background: #F7FAFC;
  border-right: 1px solid var(--c-border);
  padding: 16px 0;
}
.mockup-side-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 12px;
  color: var(--c-text-mid);
}
.mockup-side-item.active {
  background: rgba(30, 111, 224, .08);
  color: var(--c-primary);
  font-weight: 600;
  border-left: 3px solid var(--c-primary);
}
.mockup-side-item .ico {
  width: 12px; height: 12px; border-radius: 3px; background: #C6D2E0;
}
.mockup-side-item.active .ico { background: var(--c-primary); }
.mockup-content { padding: 16px 18px; }
.mockup-article {
  border-bottom: 1px solid #EEF1F6;
  padding: 10px 0;
}
.mockup-article:last-child { border-bottom: none; }
.mockup-article h4 { font-size: 13px; margin: 0 0 4px; color: var(--c-text); }
.mockup-article .src { font-size: 11px; color: var(--c-text-light); }
.mockup-article .snippet { font-size: 11px; color: var(--c-text-mid); margin-top: 4px; line-height: 1.5; }
.unread-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--c-primary); display: inline-block; margin-right: 4px; }

@media (max-width: 960px) {
  .hero { padding: 72px 0 56px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: 38px; }
  .hero p.lead { font-size: 16px; }
  .hero-mockup { max-width: 460px; margin: 0 auto; }
  .mockup-body { grid-template-columns: 150px 1fr; min-height: 280px; }
}

/* === Features Grid === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px 28px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-primary-light);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(30, 111, 224, .1);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--c-text);
}
.feature-card p {
  font-size: 15px;
  color: var(--c-text-mid);
  margin: 0;
  line-height: 1.7;
}
@media (max-width: 880px) {
  .features-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
}

/* === Use Cases (使用场景) === */
.usecases {
  background: var(--c-bg-soft);
}
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.usecase-card {
  background: #fff;
  border-radius: var(--r-lg);
  padding: 32px;
  display: flex;
  gap: 20px;
  border: 1px solid var(--c-border);
}
.usecase-num {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.usecase-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}
.usecase-card p {
  margin: 0;
  font-size: 15px;
  color: var(--c-text-mid);
  line-height: 1.7;
}
@media (max-width: 720px) {
  .usecase-grid { grid-template-columns: 1fr; }
}

/* === Platforms Section === */
.platforms {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.platform-card {
  border-radius: var(--r-xl);
  padding: 40px 36px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.platform-card.mac {
  background: linear-gradient(135deg, #2E7BF0 0%, #0E52B5 100%);
}
.platform-card.ios {
  background: linear-gradient(135deg, #1B4FB8 0%, #0A2F7A 100%);
}
.platform-card::after {
  content: "";
  position: absolute;
  top: -60px; right: -60px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(245, 201, 71, .18), transparent 70%);
  border-radius: 50%;
}
.platform-icon {
  width: 56px; height: 56px;
  background: rgba(255, 255, 255, .14);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}
.platform-icon svg { width: 28px; height: 28px; color: #fff; }
.platform-card h3 {
  font-size: 24px;
  margin: 0 0 8px;
  position: relative;
  z-index: 1;
}
.platform-card .version {
  font-size: 14px;
  opacity: .85;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}
.platform-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  position: relative;
  z-index: 1;
}
.platform-card li {
  font-size: 15px;
  line-height: 1.7;
  padding-left: 22px;
  position: relative;
  margin-bottom: 6px;
}
.platform-card li::before {
  content: "";
  position: absolute;
  left: 0; top: 11px;
  width: 12px; height: 4px;
  border-left: 2px solid var(--c-accent);
  border-bottom: 2px solid var(--c-accent);
  transform: rotate(-45deg);
}
.platform-card .btn { position: relative; z-index: 1; }
@media (max-width: 720px) {
  .platforms { grid-template-columns: 1fr; }
}

/* === Stats Strip === */
.stats {
  background: var(--c-bg-blue);
  color: #fff;
  padding: 56px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  text-align: center;
}
.stat-item h3 {
  font-size: 36px;
  font-weight: 800;
  margin: 0 0 6px;
  color: var(--c-accent);
}
.stat-item p {
  margin: 0;
  font-size: 14px;
  color: rgba(255, 255, 255, .85);
}
@media (max-width: 720px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .stat-item h3 { font-size: 28px; }
}

/* === CTA Section === */
.cta-section {
  background: linear-gradient(135deg, #F7FAFC 0%, #EAF2FC 100%);
  text-align: center;
}
.cta-section h2 {
  font-size: 34px;
  margin: 0 0 14px;
  font-weight: 700;
}
.cta-section p {
  font-size: 17px;
  color: var(--c-text-mid);
  max-width: 620px;
  margin: 0 auto 30px;
}

/* === Page Header (内页) === */
.page-header {
  background: var(--c-bg-blue);
  color: #fff;
  padding: 72px 0 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(245, 201, 71, .15), transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(74, 146, 242, .25), transparent 50%);
}
.page-header .container { position: relative; z-index: 1; }
.page-header h1 {
  font-size: 42px;
  margin: 0 0 12px;
  font-weight: 800;
}
.page-header p {
  font-size: 17px;
  color: rgba(255, 255, 255, .85);
  max-width: 700px;
  margin: 0 auto;
}
.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, .7);
  margin-bottom: 16px;
}
.breadcrumb a { color: rgba(255, 255, 255, .85); }
.breadcrumb .sep { color: rgba(255, 255, 255, .45); }
@media (max-width: 720px) {
  .page-header { padding: 56px 0 40px; }
  .page-header h1 { font-size: 30px; }
}

/* === Download Page === */
.dl-platform {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 40px;
}
.dl-card {
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #fff;
  display: flex;
  flex-direction: column;
}
.dl-card-head {
  padding: 24px 28px;
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  gap: 16px;
}
.dl-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.dl-icon.mac { background: linear-gradient(135deg, #2E7BF0, #0E52B5); }
.dl-icon.ios { background: linear-gradient(135deg, #1B4FB8, #0A2F7A); }
.dl-icon svg { width: 30px; height: 30px; color: #fff; }
.dl-card-head h3 { margin: 0; font-size: 20px; }
.dl-card-head .ver { font-size: 13px; color: var(--c-text-light); }
.dl-card-body { padding: 24px 28px; flex: 1; }
.dl-card-body p { margin: 0 0 16px; color: var(--c-text-mid); font-size: 15px; }
.dl-meta { list-style: none; padding: 0; margin: 0 0 20px; font-size: 14px; }
.dl-meta li {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text-mid);
}
.dl-meta li:last-child { border-bottom: none; }
.dl-meta li strong { color: var(--c-text); font-weight: 600; }
.dl-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.dl-actions .btn { flex: 1; min-width: 140px; }
@media (max-width: 720px) {
  .dl-platform { grid-template-columns: 1fr; }
}

.alt-source {
  background: var(--c-bg-soft);
  border-radius: var(--r-lg);
  padding: 28px 32px;
}
.alt-source h3 {
  font-size: 18px;
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.alt-source h3 svg { width: 22px; height: 22px; color: var(--c-primary); }
.alt-source-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.alt-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 16px;
  text-align: center;
}
.alt-item .name { font-weight: 600; color: var(--c-text); margin-bottom: 4px; font-size: 15px; }
.alt-item .hint { font-size: 13px; color: var(--c-text-light); }
@media (max-width: 720px) {
  .alt-source-grid { grid-template-columns: 1fr; }
}

.requirement-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
}
.requirement-table th,
.requirement-table td {
  padding: 14px 18px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--c-border);
}
.requirement-table th {
  background: var(--c-bg-soft);
  font-weight: 600;
  color: var(--c-text);
}
.requirement-table tr:last-child td { border-bottom: none; }

/* === FAQ === */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-text);
  text-align: left;
}
.faq-q .chev {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(30, 111, 224, .08);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform .2s, background .2s;
}
.faq-q .chev svg { width: 14px; height: 14px; }
.faq-item.open .faq-q .chev { transform: rotate(180deg); background: var(--c-primary); color: #fff; }
.faq-a {
  display: none;
  padding: 0 24px 22px;
  color: var(--c-text-mid);
  font-size: 15px;
  line-height: 1.75;
}
.faq-item.open .faq-a { display: block; }
.faq-a p { margin: 0 0 8px; }
.faq-a p:last-child { margin-bottom: 0; }

/* === Guide Page === */
.guide-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: start;
}
.guide-nav {
  position: sticky;
  top: 88px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 16px;
}
.guide-nav-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--c-text-light);
  padding: 0 8px 10px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 8px;
}
.guide-nav a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--c-text-mid);
  border-radius: 6px;
}
.guide-nav a:hover { background: var(--c-bg-soft); color: var(--c-primary); }
.guide-nav a.active {
  background: rgba(30, 111, 224, .1);
  color: var(--c-primary);
  font-weight: 600;
}
.guide-content section { padding: 0 0 48px; }
.guide-content section:not(:first-child) { padding-top: 48px; }
.guide-content h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 18px;
  color: var(--c-text);
  scroll-margin-top: 88px;
}
.guide-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 10px;
}
.guide-content p {
  font-size: 15px;
  color: var(--c-text-mid);
  line-height: 1.8;
  margin: 0 0 14px;
}
.guide-content ul, .guide-content ol {
  color: var(--c-text-mid);
  padding-left: 22px;
  margin: 0 0 14px;
}
.guide-content li { margin-bottom: 6px; line-height: 1.8; }
.guide-content code {
  background: var(--c-bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--c-primary-dark);
}
.guide-tip {
  background: rgba(245, 201, 71, .12);
  border-left: 3px solid var(--c-accent);
  padding: 14px 18px;
  border-radius: 6px;
  margin: 18px 0;
  color: var(--c-text);
  font-size: 14px;
}
.guide-tip strong { color: var(--c-text); }
@media (max-width: 880px) {
  .guide-layout { grid-template-columns: 1fr; }
  .guide-nav { position: static; }
}

/* === About Page === */
.about-hero {
  background: var(--c-bg-blue);
  color: #fff;
  padding: 80px 0 64px;
}
.about-hero h1 {
  font-size: 38px;
  margin: 0 0 14px;
  font-weight: 800;
}
.about-hero p {
  font-size: 17px;
  color: rgba(255, 255, 255, .88);
  max-width: 760px;
  margin: 0;
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.about-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px;
}
.about-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.about-card h3 svg { width: 22px; height: 22px; color: var(--c-primary); }
.about-card p, .about-card li {
  font-size: 15px;
  color: var(--c-text-mid);
  line-height: 1.75;
}
.about-card ul { padding-left: 20px; }
.about-card li { margin-bottom: 6px; }
@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
}

.timeline {
  border-left: 2px solid var(--c-border);
  padding-left: 24px;
  margin: 0;
}
.timeline-item {
  position: relative;
  padding-bottom: 24px;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -32px; top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 0 4px rgba(30, 111, 224, .15);
}
.timeline-year {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-primary);
  margin-bottom: 4px;
}
.timeline-item h4 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--c-text);
}
.timeline-item p {
  margin: 0;
  font-size: 14px;
  color: var(--c-text-mid);
  line-height: 1.7;
}

.team-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: center;
}
.team-avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 22px;
  flex-shrink: 0;
}
.team-card h4 { margin: 0 0 4px; font-size: 16px; }
.team-card .role { font-size: 13px; color: var(--c-primary); margin-bottom: 6px; }
.team-card p { font-size: 14px; color: var(--c-text-mid); margin: 0; line-height: 1.6; }

/* === Utility === */
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.divider { height: 1px; background: var(--c-border); margin: 40px 0; }
.hidden { display: none !important; }