/* =====================================================
   coinbase 官网 — International Brand Portal Style
   www.youmeishuo.com
   ===================================================== */

/* ---- CSS Variables ---- */
:root {
  /* Brand Colors */
  --c-navy:         #0B1D3A;
  --c-navy-mid:     #162E54;
  --c-navy-light:   #1E3F70;
  --c-blue:         #1E6FFF;
  --c-blue-hover:   #0052D4;
  --c-blue-light:   #4B9EFF;
  --c-cyan:         #00B4D8;
  --c-white:        #FFFFFF;
  --c-surface:      #F4F7FB;
  --c-surface-alt:  #EEF2F8;
  --c-border:       #DDE3EE;
  --c-border-dark:  #C8D1E0;

  /* Text */
  --c-text-primary:   #0B1D3A;
  --c-text-secondary: #4A5978;
  --c-text-muted:     #7B8BAA;
  --c-text-light:     rgba(255,255,255,0.92);
  --c-text-light-mid: rgba(255,255,255,0.65);

  /* Shadows */
  --shadow-xs: 0 1px 4px rgba(11,29,58,0.06);
  --shadow-sm: 0 2px 10px rgba(11,29,58,0.09);
  --shadow-md: 0 6px 24px rgba(11,29,58,0.11);
  --shadow-lg: 0 12px 48px rgba(11,29,58,0.14);
  --shadow-xl: 0 24px 80px rgba(11,29,58,0.18);

  /* Radii */
  --r-sm:  6px;
  --r-md:  12px;
  --r-lg:  20px;
  --r-xl:  32px;
  --r-pill: 999px;

  /* Spacing */
  --section-py:  100px;
  --section-py-sm: 64px;
  --container:  1280px;
  --nav-h:       72px;

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --t-fast:  0.18s;
  --t-base:  0.26s;
  --t-slow:  0.42s;

  /* Font */
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei UI', 'Microsoft YaHei',
    'Source Han Sans CN', sans-serif;
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--c-text-primary);
  background: var(--c-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol { list-style: none; }

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* ---- Container ---- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* ---- Utility: Section Label ---- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-blue);
  background: rgba(30,111,255,0.08);
  padding: 5px 12px 5px 10px;
  border-radius: var(--r-pill);
  margin-bottom: 18px;
}
.section-label.light {
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.12);
}
.section-label img { filter: none; }

.section-title {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--c-navy);
  margin-bottom: 18px;
}
.section-title.light { color: var(--c-white); }

.section-intro {
  font-size: 16px;
  color: var(--c-text-secondary);
  max-width: 620px;
  line-height: 1.75;
}
.section-intro.light { color: var(--c-text-light-mid); }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header .section-intro { margin: 0 auto; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--r-md);
  padding: 12px 24px;
  transition: all var(--t-base) var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--c-blue);
  color: var(--c-white);
  border-color: var(--c-blue);
}
.btn-primary:hover {
  background: var(--c-blue-hover);
  border-color: var(--c-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(30,111,255,0.35);
}
.btn-outline {
  background: transparent;
  color: var(--c-white);
  border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.8);
}
.btn-white {
  background: var(--c-white);
  color: var(--c-navy);
  border-color: var(--c-white);
}
.btn-white:hover {
  background: #E8EEF8;
  transform: translateY(-1px);
}
.btn-lg {
  font-size: 16px;
  padding: 15px 32px;
  border-radius: var(--r-lg);
}
.btn-nav-cta {
  background: var(--c-blue);
  color: var(--c-white);
  border-color: var(--c-blue);
  padding: 9px 20px;
  font-size: 14px;
  border-radius: var(--r-md);
}
.btn-nav-cta:hover {
  background: var(--c-blue-hover);
  border-color: var(--c-blue-hover);
}

/* =====================================================
   NAVIGATION
   ===================================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: var(--nav-h);
  background: rgba(11, 29, 58, 0.97);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
}
.site-nav.scrolled {
  background: rgba(10, 22, 46, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 24px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-emblem {
  width: 32px;
  height: 32px;
  color: var(--c-blue-light);
  flex-shrink: 0;
}
.logo-emblem svg { width: 100%; height: 100%; }
.logo-wordmark {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.nav-link {
  display: block;
  padding: 7px 12px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  border-radius: var(--r-sm);
  transition: color var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}
.nav-link:hover { color: var(--c-white); background: rgba(255,255,255,0.08); }
.nav-link.active { color: var(--c-white); background: rgba(30,111,255,0.2); }

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

.nav-mobile-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,0.08);
  transition: background var(--t-fast);
}
.nav-mobile-btn:hover { background: rgba(255,255,255,0.14); }
.hamburger-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: rgba(255,255,255,0.85);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-base);
}
.nav-mobile-btn.open .hamburger-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-mobile-btn.open .hamburger-bar:nth-child(2) { opacity: 0; }
.nav-mobile-btn.open .hamburger-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =====================================================
   PORTAL HERO
   ===================================================== */
.section-portal {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 60px) 0 80px;
  background: var(--c-navy);
  overflow: hidden;
}

.portal-bg-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.portal-grid-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30,111,255,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,111,255,0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 30%, transparent 100%);
}
.portal-glow-1 {
  position: absolute;
  top: -10%;
  left: 20%;
  width: 60%;
  height: 70%;
  background: radial-gradient(ellipse, rgba(30,111,255,0.18) 0%, transparent 65%);
}
.portal-glow-2 {
  position: absolute;
  bottom: 10%;
  right: 5%;
  width: 40%;
  height: 50%;
  background: radial-gradient(ellipse, rgba(0,180,216,0.10) 0%, transparent 65%);
}

.portal-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 60px;
}
.portal-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-blue-light);
  background: rgba(75,158,255,0.12);
  border: 1px solid rgba(75,158,255,0.2);
  padding: 6px 16px;
  border-radius: var(--r-pill);
  margin-bottom: 28px;
  text-transform: uppercase;
}
.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-blue-light);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.portal-title {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--c-white);
  margin-bottom: 24px;
}
.portal-title-sub {
  display: block;
  font-size: clamp(22px, 3.5vw, 44px);
  font-weight: 600;
  color: var(--c-blue-light);
  letter-spacing: -0.02em;
  margin-top: 4px;
}
.portal-desc {
  font-size: 16px;
  color: var(--c-text-light-mid);
  line-height: 1.8;
  margin: 0 auto 36px;
  max-width: 640px;
}
.portal-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.portal-entries {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  max-width: 960px;
  margin: 0 auto;
}
.portal-entry-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-lg);
  text-decoration: none;
  transition: background var(--t-base), border-color var(--t-base), transform var(--t-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.portal-entry-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(30,111,255,0.08) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--t-base);
}
.portal-entry-card:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(30,111,255,0.3);
  transform: translateY(-2px);
}
.portal-entry-card:hover::before { opacity: 1; }

.pe-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  background: rgba(30,111,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.pe-icon-wrap img { color: var(--c-blue-light); filter: brightness(0) saturate(100%) invert(60%) sepia(80%) saturate(500%) hue-rotate(200deg) brightness(115%); }
.pe-info { flex: 1; min-width: 0; }
.pe-title {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white);
  white-space: nowrap;
}
.pe-sub {
  display: block;
  font-size: 11px;
  color: var(--c-text-light-mid);
  margin-top: 2px;
  white-space: nowrap;
}
.pe-arrow {
  flex-shrink: 0;
  opacity: 0.4;
  filter: invert(1);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.portal-entry-card:hover .pe-arrow {
  transform: translateX(3px);
  opacity: 0.8;
}

/* =====================================================
   BRAND OVERVIEW
   ===================================================== */
.section-overview {
  padding: var(--section-py) 0;
  background: var(--c-surface);
}
.overview-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}
.overview-text {
  color: var(--c-text-secondary);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 20px;
}
.overview-values {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 32px;
}
.ov-value-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  background: var(--c-white);
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
  transition: box-shadow var(--t-base), border-color var(--t-base);
}
.ov-value-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--c-blue-light);
}
.ov-value-item img { flex-shrink: 0; margin-top: 2px; color: var(--c-blue); }
.ov-value-item strong { display: block; font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.ov-value-item p { font-size: 14px; color: var(--c-text-secondary); line-height: 1.65; }

.overview-img-wrap {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.overview-img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  display: block;
  background: linear-gradient(135deg, var(--c-navy-mid), var(--c-navy));
}
.overview-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(11,29,58,0.4) 100%);
  border-radius: var(--r-xl);
}
.overview-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 20px;
}
.stat-box {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 18px 14px;
  text-align: center;
  box-shadow: var(--shadow-xs);
}
.stat-num, .stat-num24 {
  display: inline-block;
  font-size: 28px;
  font-weight: 800;
  color: var(--c-blue);
  letter-spacing: -0.03em;
  line-height: 1;
}
.stat-num24 {
  font-size: 22px;
}
.stat-unit {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-blue);
}
.stat-label {
  display: block;
  font-size: 12px;
  color: var(--c-text-muted);
  margin-top: 6px;
  font-weight: 500;
}

/* =====================================================
   PRODUCT SERVICES
   ===================================================== */
.section-services {
  padding: var(--section-py) 0;
  background: var(--c-white);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.service-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: 32px 28px;
  transition: box-shadow var(--t-base), border-color var(--t-base), transform var(--t-base);
  display: flex;
  flex-direction: column;
}
.service-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--c-blue-light);
  transform: translateY(-4px);
}
.sc-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(30,111,255,0.12), rgba(0,180,216,0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  border: 1px solid rgba(30,111,255,0.12);
}
.sc-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 12px;
}
.sc-desc {
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.75;
  flex: 1;
  margin-bottom: 20px;
}
.sc-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-blue);
  text-decoration: none;
  transition: gap var(--t-fast);
}
.sc-link:hover { gap: 10px; }

.services-banner {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  height: 320px;
}
.services-banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: linear-gradient(135deg, var(--c-navy-mid), var(--c-navy-light));
}
.services-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11,29,58,0.88) 0%, rgba(11,29,58,0.5) 60%, transparent 100%);
  display: flex;
  align-items: center;
  padding: 40px 56px;
}
.sbo-content h3 {
  font-size: clamp(20px, 2.5vw, 30px);
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 12px;
  line-height: 1.3;
}
.sbo-content p {
  font-size: 15px;
  color: var(--c-text-light-mid);
  margin-bottom: 24px;
  max-width: 480px;
}

/* =====================================================
   DOWNLOAD GUIDE
   ===================================================== */
.section-download {
  padding: var(--section-py) 0;
  background: var(--c-navy);
  position: relative;
  overflow: hidden;
}
.section-download::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-blue), var(--c-cyan), transparent);
}

.download-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 72px;
  align-items: start;
}
.download-intro { padding-top: 8px; }
.download-img-wrap {
  margin-top: 36px;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,0.4);
  max-width: 300px;
}
.download-phone-img {
  width: 100%;
  object-fit: cover;
  background: linear-gradient(180deg, var(--c-navy-mid), var(--c-navy-light));
}

.download-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  background: rgba(255,255,255,0.05);
  padding: 6px;
  border-radius: var(--r-lg);
  border: 1px solid rgba(255,255,255,0.08);
}
.dl-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,0.55);
  border-radius: var(--r-md);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--t-base);
  flex: 1;
  justify-content: center;
}
.dl-tab:hover { color: rgba(255,255,255,0.85); }
.dl-tab.active {
  background: var(--c-blue);
  color: var(--c-white);
  box-shadow: 0 4px 16px rgba(30,111,255,0.35);
}
.dl-tab img {
  filter: brightness(0) saturate(100%) invert(1);
  opacity: 0.6;
}
.dl-tab.active img { opacity: 1; }

.dl-platform-info {
  margin-bottom: 20px;
}
.dl-platform-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-blue-light);
  background: rgba(30,111,255,0.12);
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(30,111,255,0.2);
}

.dl-steps { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.dl-step {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--r-md);
  transition: background var(--t-fast), border-color var(--t-fast);
}
.dl-step:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(30,111,255,0.2);
}
.dl-step-num {
  font-size: 12px;
  font-weight: 800;
  color: var(--c-blue-light);
  background: rgba(30,111,255,0.15);
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: 0.03em;
}
.dl-step-content strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 5px;
}
.dl-step-content p {
  font-size: 13px;
  color: var(--c-text-light-mid);
  line-height: 1.65;
}

.dl-security-notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 20px;
  padding: 16px 18px;
  background: rgba(255,200,50,0.06);
  border: 1px solid rgba(255,200,50,0.15);
  border-radius: var(--r-md);
}
.dl-security-notice img { flex-shrink: 0; margin-top: 2px; filter: brightness(0) saturate(100%) invert(85%) sepia(40%) saturate(600%) hue-rotate(10deg); }
.dl-security-notice p {
  font-size: 13px;
  color: rgba(255,220,100,0.85);
  line-height: 1.65;
}
.dl-security-notice strong { color: rgba(255,225,120,1); }

.dl-panel[hidden] { display: none; }

/* =====================================================
   ACCOUNT SUPPORT
   ===================================================== */
.section-account {
  padding: var(--section-py) 0;
  background: var(--c-white);
}

.account-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-bottom: 48px;
  position: relative;
}
.acct-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 20px;
}
.as-connector {
  flex: 0 0 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-cyan));
  margin-top: 26px;
  opacity: 0.3;
  align-self: flex-start;
}
.as-num {
  font-size: 12px;
  font-weight: 800;
  color: var(--c-blue);
  background: rgba(30,111,255,0.1);
  border: 1px solid rgba(30,111,255,0.2);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.as-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(30,111,255,0.1), rgba(0,180,216,0.06));
  border: 1px solid rgba(30,111,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.as-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 10px;
}
.as-desc {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.7;
}

.account-support-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
.asp-card {
  padding: 24px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: box-shadow var(--t-base), border-color var(--t-base);
}
.asp-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--c-blue-light);
}
.asp-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.asp-head h3 { font-size: 15px; font-weight: 700; color: var(--c-navy); }
.asp-card p { font-size: 13px; color: var(--c-text-secondary); line-height: 1.7; }

.account-img-feature {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  height: 260px;
}
.account-feature-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: linear-gradient(135deg, #1B3A6B, var(--c-navy));
}
.account-feature-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11,29,58,0.75), rgba(11,29,58,0.3));
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 0 56px;
  gap: 16px;
}
.afo-tagline {
  font-size: clamp(18px, 2.5vw, 26px);
  font-weight: 700;
  color: var(--c-white);
}

/* =====================================================
   SECURITY CENTER
   ===================================================== */
.section-security {
  padding: var(--section-py) 0;
  background: var(--c-navy);
  position: relative;
  overflow: hidden;
}
.security-bg-img {
  position: absolute;
  inset: 0;
}
.sec-bg-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
}
.sec-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--c-navy) 0%, rgba(11,29,58,0.85) 50%, var(--c-navy) 100%);
}
.section-security .container { position: relative; z-index: 1; }

.security-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.sec-feature-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-xl);
  padding: 32px 26px;
  transition: background var(--t-base), border-color var(--t-base), transform var(--t-base);
}
.sec-feature-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(30,111,255,0.3);
  transform: translateY(-3px);
}
.sec-icon {
  color: var(--c-blue-light);
  margin-bottom: 18px;
  filter: brightness(0) saturate(100%) invert(60%) sepia(80%) saturate(500%) hue-rotate(200deg) brightness(120%);
}
.sec-feature-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 10px;
}
.sec-feature-card p {
  font-size: 13px;
  color: var(--c-text-light-mid);
  line-height: 1.7;
}

.security-warnings {
  background: rgba(220, 60, 60, 0.07);
  border: 1px solid rgba(220, 60, 60, 0.2);
  border-radius: var(--r-xl);
  padding: 28px 32px;
}
.sec-warn-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.sec-warn-title img {
  filter: brightness(0) saturate(100%) invert(45%) sepia(90%) saturate(600%) hue-rotate(330deg) brightness(105%);
}
.sec-warn-title strong {
  font-size: 16px;
  font-weight: 700;
  color: rgba(255, 160, 140, 1);
}
.sec-warn-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sec-warn-list li {
  font-size: 14px;
  color: rgba(255, 210, 200, 0.85);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}
.sec-warn-list li::before {
  content: '⚠';
  position: absolute;
  left: 0;
  font-size: 12px;
  top: 1px;
  opacity: 0.7;
}

/* =====================================================
   HELP CENTER
   ===================================================== */
.section-help {
  padding: var(--section-py) 0;
  background: var(--c-surface);
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 60px;
}
.help-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: 28px 24px;
  transition: box-shadow var(--t-base), border-color var(--t-base), transform var(--t-base);
  display: flex;
  flex-direction: column;
}
.help-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--c-blue-light);
  transform: translateY(-3px);
}
.hc-icon-wrap {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(30,111,255,0.1), rgba(0,180,216,0.06));
  border-radius: var(--r-md);
  border: 1px solid rgba(30,111,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.help-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 10px;
}
.help-card p {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}
.hc-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--t-fast);
}
.hc-link:hover { gap: 8px; }

/* Help Terminology */
.help-terminology {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  overflow: hidden;
}
.ht-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 32px;
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-navy-mid) 100%);
}
.ht-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
}
.ht-items { padding: 8px 0; }
.ht-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  border-bottom: 1px solid var(--c-border);
}
.ht-item:last-child { border-bottom: none; }
.ht-label {
  display: flex;
  align-items: flex-start;
  padding: 20px 24px;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-blue);
  background: rgba(30,111,255,0.03);
  border-right: 1px solid var(--c-border);
  line-height: 1.5;
}
.ht-content {
  padding: 18px 28px;
}
.ht-content p {
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.75;
}
.ht-content strong { color: var(--c-navy); }

/* =====================================================
   Q&A SECTION
   ===================================================== */
.section-qa {
  padding: var(--section-py) 0;
  background: var(--c-white);
}

.qa-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  align-items: start;
}

.qa-categories {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}
.qa-cat {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--t-fast);
}
.qa-cat:hover { background: var(--c-surface); color: var(--c-navy); }
.qa-cat.active {
  background: rgba(30,111,255,0.08);
  color: var(--c-blue);
  border-color: rgba(30,111,255,0.2);
  font-weight: 700;
}

.qa-list { display: flex; flex-direction: column; gap: 8px; }

.qa-item {
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.qa-item.open {
  border-color: var(--c-blue-light);
  box-shadow: var(--shadow-sm);
}
.qa-item.hidden-by-filter { display: none; }

.qa-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-navy);
  background: var(--c-white);
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast);
}
.qa-question:hover { background: var(--c-surface); }
.qa-item.open .qa-question { background: rgba(30,111,255,0.04); color: var(--c-blue); }

.qa-arrow {
  flex-shrink: 0;
  transition: transform var(--t-base) var(--ease-out);
  opacity: 0.5;
}
.qa-item.open .qa-arrow {
  transform: rotate(90deg);
  opacity: 1;
  filter: brightness(0) saturate(100%) invert(30%) sepia(80%) saturate(1200%) hue-rotate(210deg);
}

.qa-answer {
  padding: 0 22px 18px;
  background: var(--c-white);
  border-top: 1px solid var(--c-border);
}
.qa-answer[hidden] { display: none; }
.qa-item.open .qa-answer { display: block; }
.qa-answer p {
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.8;
  padding-top: 16px;
}
.qa-answer strong { color: var(--c-navy); }

/* =====================================================
   CONTACT
   ===================================================== */
.section-contact {
  padding: var(--section-py) 0;
  background: var(--c-surface);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 36px;
}
.contact-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: 28px 24px;
  transition: box-shadow var(--t-base), border-color var(--t-base), transform var(--t-base);
}
.contact-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--c-blue-light);
  transform: translateY(-2px);
}
.contact-card.primary {
  border-color: var(--c-blue-light);
  background: linear-gradient(135deg, rgba(30,111,255,0.03) 0%, var(--c-white) 60%);
}
.contact-card.wide {
  grid-column: span 4;
}
.cc-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(30,111,255,0.1), rgba(0,180,216,0.06));
  border: 1px solid rgba(30,111,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.contact-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 6px;
}
.contact-card > p {
  font-size: 13px;
  color: var(--c-text-muted);
  margin-bottom: 12px;
}
.cc-value {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-blue);
  line-height: 1.6;
  transition: color var(--t-fast);
}
a.cc-value:hover { color: var(--c-blue-hover); text-decoration: underline; }

.contact-notice {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.cn-block {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 24px 28px;
}
.cn-block h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 10px;
}
.cn-block p {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.75;
}

/* =====================================================
   FOOTER
   ===================================================== */
.site-footer {
  background: var(--c-navy);
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-main {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 80px;
  padding: 64px 40px 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  text-decoration: none;
}
.footer-logo .logo-emblem {
  color: var(--c-blue-light);
}
.footer-logo .logo-wordmark {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-white);
}
.footer-tagline {
  font-size: 14px;
  color: var(--c-text-light-mid);
  line-height: 1.6;
  margin-bottom: 8px;
  max-width: 280px;
}
.footer-domain {
  font-size: 13px;
  color: rgba(255,255,255,0.3);
}

.footer-nav-group {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.fn-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.fn-col ul { display: flex; flex-direction: column; gap: 8px; }
.fn-col a {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  text-decoration: none;
  transition: color var(--t-fast);
}
.fn-col a:hover { color: var(--c-white); }

.footer-bottom {
  padding: 20px 40px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-copy, .footer-disclaimer {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
  line-height: 1.6;
}

/* =====================================================
   SCROLL REVEAL ANIMATION
   ===================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--t-slow) var(--ease-out),
              transform var(--t-slow) var(--ease-out);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.22s; }

/* =====================================================
   RESPONSIVE: Tablet (max 1024px)
   ===================================================== */
@media (max-width: 1024px) {
  .container { padding: 0 24px; }

  .nav-links { display: none; }
  .nav-mobile-btn { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(10, 22, 46, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 24px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    gap: 4px;
    z-index: 899;
    animation: nav-slide-in 0.2s var(--ease-out);
  }
  @keyframes nav-slide-in {
    from { transform: translateY(-10px); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
  }
  .nav-links.open .nav-link {
    padding: 12px 16px;
    font-size: 15px;
  }

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

  .overview-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .overview-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .download-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .download-img-wrap {
    max-width: 240px;
  }

  .account-steps {
    flex-wrap: wrap;
    gap: 24px;
  }
  .acct-step {
    flex: 1 1 calc(50% - 24px);
  }
  .as-connector { display: none; }

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

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

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

  .qa-layout {
    grid-template-columns: 1fr;
  }
  .qa-categories {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-card.wide {
    grid-column: span 2;
  }
  .contact-notice {
    grid-template-columns: 1fr;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 48px 24px 32px;
  }
  .footer-nav-group {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .footer-bottom {
    padding: 16px 24px;
  }

  .ht-item {
    grid-template-columns: 160px 1fr;
  }
}

/* =====================================================
   RESPONSIVE: Mobile (max 640px)
   ===================================================== */
@media (max-width: 640px) {
  :root {
    --section-py: 64px;
    --nav-h: 64px;
  }
  .container { padding: 0 16px; }

  .portal-entries {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .portal-entry-card {
    flex-direction: column;
    text-align: center;
    padding: 16px 12px;
    gap: 8px;
  }
  .pe-arrow { display: none; }

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

  .services-banner {
    height: 260px;
  }
  .services-banner-overlay {
    padding: 24px 20px;
  }
  .sbo-content .btn { font-size: 14px; padding: 10px 20px; }

  .download-tabs {
    flex-direction: column;
  }

  .account-steps { flex-direction: column; }
  .acct-step { flex: 1 1 100%; }

  .account-support-grid {
    grid-template-columns: 1fr;
  }

  .security-features {
    grid-template-columns: 1fr;
  }

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

  .ht-item {
    grid-template-columns: 1fr;
  }
  .ht-label {
    border-right: none;
    border-bottom: 1px solid var(--c-border);
    padding: 14px 20px 10px;
  }
  .ht-content { padding: 12px 20px 18px; }

  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-card.wide { grid-column: span 1; }

  .footer-nav-group {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .portal-cta-group {
    flex-direction: column;
    align-items: stretch;
  }
  .portal-cta-group .btn {
    text-align: center;
    justify-content: center;
  }

  .stat-box { padding: 14px 10px; }
  .stat-num { font-size: 22px; }
}