/* ============================================
   Bitget V1 - Premium Fintech Static Styles
   Design Token System + Layout + Components
   ============================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand */
  --brand-primary: #00F0FF;
  --brand-primary-hover: #00D4E0;
  --brand-primary-active: #00B8C4;
  --brand-dim: rgba(0, 240, 255, 0.12);
  --brand-glow: rgba(0, 240, 255, 0.25);

  /* Surface */
  --surface-base: #0A0E14;
  --surface-raised: #111821;
  --surface-overlay: #161E2A;
  --surface-card: #1A2330;
  --surface-card-hover: #202B3A;
  --border: rgba(255, 255, 255, 0.08);
  --border-active: rgba(0, 240, 255, 0.35);

  /* Text */
  --text-primary: #F5F7FA;
  --text-secondary: #A0AEC0;
  --text-tertiary: #6B7A8F;
  --text-inverse: #0A0E14;
  --text-brand: #00F0FF;

  /* Gradients */
  --gradient-hero: radial-gradient(ellipse at 50% 0%, rgba(0,240,255,0.08) 0%, transparent 55%);
  --gradient-card: linear-gradient(135deg, rgba(0,240,255,0.04) 0%, transparent 50%);
  --gradient-cta: linear-gradient(135deg, #00F0FF 0%, #00C4D0 100%);
  --gradient-final: radial-gradient(ellipse at 50% 50%, rgba(0,240,255,0.10) 0%, transparent 60%);

  /* Typography */
  --font-display: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Type Scale */
  --fs-display1: 3.5rem;
  --fs-display2: 2.75rem;
  --fs-h1: 2.25rem;
  --fs-h2: 1.75rem;
  --fs-h3: 1.375rem;
  --fs-body-lg: 1.125rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-caption: 0.75rem;
  --fs-eyebrow: 0.8125rem;

  /* Spacing */
  --sp-3xs: 2px;
  --sp-2xs: 4px;
  --sp-xs: 8px;
  --sp-sm: 12px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;
  --sp-3xl: 64px;
  --sp-4xl: 96px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-card: 0 2px 8px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-card-hover: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,240,255,0.15);
  --shadow-cta: 0 4px 24px rgba(0,240,255,0.3);
  --shadow-sticky: 0 -4px 24px rgba(0,0,0,0.5);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --header-height: 64px;

  /* Transition */
  --t-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-header: 500;
  --z-sticky-cta: 600;
  --z-dropdown: 100;
  --z-overlay: 800;
}

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

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

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

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

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

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

summary {
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker { display: none; }

/* ---------- Accessibility ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  padding: var(--sp-md) var(--sp-lg);
  background: var(--brand-primary);
  color: var(--text-inverse);
  font-weight: 600;
  z-index: 9999;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--t-fast);
}

.skip-link:focus {
  top: 0;
}

:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

.container--narrow {
  max-width: var(--container-narrow);
}

/* ---------- Section ---------- */
.section {
  padding: var(--sp-4xl) 0;
  position: relative;
}

.section__header {
  margin-bottom: var(--sp-3xl);
  max-width: 640px;
}

.section__header--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section__eyebrow {
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-brand);
  margin-bottom: var(--sp-md);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: var(--sp-md);
}

.section__desc {
  font-size: var(--fs-body-lg);
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-sm);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 600;
  border-radius: var(--radius-md);
  min-height: 48px;
  padding: 14px 32px;
  transition: all var(--t-base);
  white-space: nowrap;
  text-decoration: none;
  border: none;
}

.btn--large {
  padding: 16px 36px;
  min-height: 52px;
  font-size: var(--fs-body-lg);
}

.btn--compact {
  padding: 10px 20px;
  min-height: 40px;
  font-size: var(--fs-small);
}

.btn--primary {
  background: var(--gradient-cta);
  color: var(--text-inverse);
  box-shadow: var(--shadow-cta);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 32px rgba(0,240,255,0.45);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-active);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  border-color: var(--brand-primary);
  color: var(--text-brand);
}

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-header);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--sp-lg);
}

.header__logo img {
  height: 28px;
  width: auto;
}

.header__nav {
  display: flex;
  gap: var(--sp-xl);
}

.header__link {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--t-fast);
}

.header__link:hover {
  color: var(--text-primary);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

/* ---------- Language Switcher ---------- */
.lang-switcher {
  position: relative;
}

.lang-switcher__trigger {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  padding: 8px var(--sp-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--fs-small);
  font-weight: 500;
  min-height: 40px;
  transition: all var(--t-fast);
}

.lang-switcher__trigger:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.lang-switcher__trigger[aria-expanded="true"] {
  border-color: var(--brand-primary);
  color: var(--text-primary);
}

.lang-switcher__chevron {
  transition: transform var(--t-base);
}

.lang-switcher__trigger[aria-expanded="true"] .lang-switcher__chevron {
  transform: rotate(180deg);
}

.lang-switcher__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 220px;
  max-height: 400px;
  overflow-y: auto;
  background: var(--surface-overlay);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-xs);
  box-shadow: var(--shadow-card-hover);
  z-index: var(--z-dropdown);
  display: none;
}

.lang-switcher__menu--open {
  display: block;
}

.lang-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-sm) var(--sp-md);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: var(--fs-small);
  transition: all var(--t-fast);
}

.lang-option:hover {
  background: var(--surface-card-hover);
  color: var(--text-primary);
}

.lang-option--active {
  color: var(--text-brand);
  background: var(--brand-dim);
}

.lang-option__code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  opacity: 0.6;
}

.lang-option__label {
  font-weight: 500;
}

/* ---------- Mobile Menu Toggle ---------- */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  min-height: 40px;
  justify-content: center;
}

.header__menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--t-base);
}

.header__menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.header__menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.header__menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-lg);
}

.mobile-menu[hidden] { display: none !important; }

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-md);
}

.mobile-menu__link {
  font-size: var(--fs-body-lg);
  font-weight: 500;
  color: var(--text-primary);
  padding: var(--sp-sm) 0;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}

.hero__bg::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,240,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero__content {
  max-width: 640px;
  padding: var(--sp-4xl) 0;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-brand);
  padding: 6px 14px;
  border: 1px solid var(--border-active);
  border-radius: var(--radius-full);
  background: var(--brand-dim);
  margin-bottom: var(--sp-lg);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-display1);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--sp-lg);
}

.hero__subtitle {
  font-size: var(--fs-body-lg);
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--sp-xl);
  max-width: 540px;
}

.hero__cta {
  display: flex;
  gap: var(--sp-md);
  flex-wrap: wrap;
  margin-bottom: var(--sp-xl);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  font-size: var(--fs-small);
  color: var(--text-tertiary);
}

.hero__badge svg {
  color: var(--text-brand);
}

/* ---------- Trust Grid ---------- */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-xl);
}

.trust-item {
  padding: var(--sp-lg);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border);
  text-align: center;
}

.trust-item__value {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 700;
  color: var(--text-brand);
  margin-bottom: var(--sp-xs);
  letter-spacing: -0.02em;
}

.trust-item__label {
  font-size: var(--fs-small);
  color: var(--text-secondary);
}

/* ---------- Feature Grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
}

.feature-card {
  padding: var(--sp-xl);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border);
  transition: all var(--t-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--t-base);
  pointer-events: none;
}

.feature-card:hover {
  background: var(--surface-card-hover);
  border-color: var(--border-active);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

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

.feature-card__icon {
  color: var(--text-brand);
  margin-bottom: var(--sp-md);
  position: relative;
}

.feature-card__title {
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--sp-sm);
  position: relative;
}

.feature-card__desc {
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text-secondary);
  position: relative;
}

/* ---------- Product Grid ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-md);
}

.product-link {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-lg);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border);
  transition: all var(--t-base);
}

.product-link:hover {
  background: var(--surface-card-hover);
  border-color: var(--border-active);
  transform: translateX(4px);
}

.product-link__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--brand-dim);
  color: var(--text-brand);
}

.product-link__name {
  font-size: var(--fs-body-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.product-link__desc {
  font-size: var(--fs-small);
  color: var(--text-secondary);
}

/* ---------- Register Layout ---------- */
.register-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--sp-3xl);
  align-items: start;
}

.register-steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-md);
  margin: var(--sp-xl) 0;
}

.step-card {
  padding: var(--sp-lg);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border);
}

.step-card__number {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--brand-primary);
  opacity: 0.4;
  margin-bottom: var(--sp-xs);
  letter-spacing: -0.02em;
}

.step-card__number--small {
  font-size: var(--fs-h3);
}

.step-card__title {
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--sp-xs);
}

.step-card__desc {
  font-size: var(--fs-small);
  color: var(--text-secondary);
  line-height: 1.5;
}

.step-card--compact {
  display: flex;
  gap: var(--sp-md);
  align-items: flex-start;
}

.step-card--compact .step-card__body {
  flex: 1;
}

.register-cta {
  margin: var(--sp-xl) 0 var(--sp-md);
}

.register-note {
  font-size: var(--fs-small);
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* ---------- Download Card ---------- */
.download-card {
  padding: var(--sp-xl);
  border-radius: var(--radius-xl);
  background: var(--surface-raised);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.download-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0,240,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.download-card__title {
  font-size: var(--fs-h3);
  font-weight: 600;
  margin-bottom: var(--sp-xs);
}

.download-card__desc {
  font-size: var(--fs-small);
  color: var(--text-secondary);
  margin-bottom: var(--sp-lg);
}

.download-card__buttons {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-lg);
}

.download-btn {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md) var(--sp-lg);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  transition: all var(--t-base);
  min-height: 52px;
}

.download-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-active);
  transform: translateY(-1px);
}

.download-btn--large {
  min-height: 60px;
  padding: var(--sp-md) var(--sp-xl);
}

.download-btn__text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.download-btn__small {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
}

.download-btn__large {
  font-size: var(--fs-body-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.download-card__qr {
  text-align: center;
  margin: var(--sp-lg) 0;
}

.qr-placeholder {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  margin-bottom: var(--sp-sm);
}

.download-card__qr-label {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
}

.download-card__desktop {
  width: 100%;
}

.download-card__note {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  margin-top: var(--sp-md);
  text-align: center;
}

/* ---------- Language Grid ---------- */
.lang-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  justify-content: center;
  max-width: 720px;
  margin: 0 auto;
}

.lang-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  padding: var(--sp-sm) var(--sp-md);
  border-radius: var(--radius-full);
  background: var(--surface-card);
  border: 1px solid var(--border);
  font-size: var(--fs-small);
  color: var(--text-secondary);
  transition: all var(--t-fast);
}

.lang-chip:hover {
  background: var(--surface-card-hover);
  border-color: var(--border-active);
  color: var(--text-primary);
}

.lang-chip--active {
  background: var(--brand-dim);
  border-color: var(--brand-primary);
  color: var(--text-brand);
}

.lang-chip__code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  opacity: 0.7;
}

/* ---------- Beginner Grid ---------- */
.beginner-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-md);
}

/* ---------- FAQ ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.faq-item {
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color var(--t-base);
}

.faq-item[open] {
  border-color: var(--border-active);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-lg) var(--sp-xl);
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--text-primary);
  gap: var(--sp-md);
}

.faq-item__icon {
  flex-shrink: 0;
  color: var(--text-brand);
  transition: transform var(--t-base);
}

.faq-item[open] .faq-item__icon {
  transform: rotate(180deg);
}

.faq-item__answer {
  padding: 0 var(--sp-xl) var(--sp-lg);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---------- Final CTA ---------- */
.section--final-cta {
  padding: var(--sp-4xl) 0;
}

.final-cta {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  padding: var(--sp-4xl) var(--sp-3xl);
  text-align: center;
}

.final-cta__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-final);
  z-index: 0;
}

.final-cta__content {
  position: relative;
  z-index: 1;
  max-width: 560px;
  margin: 0 auto;
}

.final-cta__title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-md);
}

.final-cta__desc {
  font-size: var(--fs-body-lg);
  color: var(--text-secondary);
  margin-bottom: var(--sp-xl);
}

.final-cta__buttons {
  display: flex;
  gap: var(--sp-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--surface-base);
  padding: var(--sp-3xl) 0 var(--sp-xl);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-2xl);
  margin-bottom: var(--sp-2xl);
  flex-wrap: wrap;
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  margin-bottom: var(--sp-md);
}

.footer__desc {
  font-size: var(--fs-small);
  color: var(--text-tertiary);
  line-height: 1.5;
}

.footer__nav {
  display: flex;
  gap: var(--sp-xl);
  flex-wrap: wrap;
}

.footer__link {
  font-size: var(--fs-small);
  color: var(--text-secondary);
  transition: color var(--t-fast);
}

.footer__link:hover {
  color: var(--text-brand);
}

.footer__bottom {
  border-top: 1px solid var(--border);
  padding-top: var(--sp-lg);
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.footer__disclaimer {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  line-height: 1.5;
}

.footer__risk {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
  line-height: 1.5;
}

.footer__copyright {
  font-size: var(--fs-caption);
  color: var(--text-tertiary);
}

/* ---------- Sticky CTA (Mobile) ---------- */
.sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--sp-sm) var(--sp-md);
  background: rgba(10, 14, 20, 0.95);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  z-index: var(--z-sticky-cta);
  gap: var(--sp-sm);
}

.sticky-cta .btn {
  flex: 1;
}

.sticky-cta__register {
  flex: 2 !important;
}

/* ---------- Download Page ---------- */
.download-page {
  background: var(--surface-base);
}

.download-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-xl);
}

.download-container {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.download-logo {
  margin-bottom: var(--sp-xl);
  display: flex;
  justify-content: center;
}

.download-title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  margin-bottom: var(--sp-sm);
}

.download-subtitle {
  font-size: var(--fs-body);
  color: var(--text-secondary);
  margin-bottom: var(--sp-xl);
}

.download-spinner {
  display: flex;
  justify-content: center;
  margin-bottom: var(--sp-xl);
}

.download-spinner__ring {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.download-manual {
  margin-top: var(--sp-xl);
}

.download-manual__label {
  font-size: var(--fs-small);
  color: var(--text-tertiary);
  margin-bottom: var(--sp-md);
}

.download-manual__buttons {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.download-noscript {
  margin-top: var(--sp-xl);
  padding: var(--sp-lg);
  border-radius: var(--radius-lg);
  background: var(--surface-card);
  border: 1px solid var(--border);
  text-align: left;
}

.download-noscript ul {
  list-style: none;
  margin-top: var(--sp-sm);
}

.download-noscript li {
  padding: var(--sp-xs) 0;
}

.download-noscript a {
  color: var(--text-brand);
  text-decoration: underline;
}

.download-back {
  display: inline-block;
  margin-top: var(--sp-xl);
  font-size: var(--fs-small);
  color: var(--text-tertiary);
  transition: color var(--t-fast);
}

.download-back:hover {
  color: var(--text-brand);
}

/* ---------- RTL Support ---------- */
[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="rtl"] .header__inner {
  flex-direction: row-reverse;
}

[dir="rtl"] .hero__content {
  margin-left: auto;
  margin-right: 0;
}

[dir="rtl"] .product-link:hover {
  transform: translateX(-4px);
}

[dir="rtl"] .faq-item__icon {
  margin-left: 0;
  margin-right: auto;
}

[dir="rtl"] .lang-switcher__menu {
  right: auto;
  left: 0;
}

[dir="rtl"] .download-btn__text {
  text-align: right;
}

/* ---------- Responsive: Tablet ---------- */
@media (max-width: 1024px) {
  :root {
    --fs-display1: 2.75rem;
    --fs-display2: 2.25rem;
    --fs-h1: 1.875rem;
    --fs-h2: 1.5rem;
  }

  .header__nav {
    display: none;
  }

  .header__menu-toggle {
    display: flex;
  }

  .header__download span {
    display: none;
  }

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

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

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

  .register-layout {
    grid-template-columns: 1fr;
    gap: var(--sp-xl);
  }

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

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

/* ---------- Responsive: Mobile ---------- */
@media (max-width: 768px) {
  :root {
    --fs-display1: 2rem;
    --fs-h1: 1.625rem;
    --fs-h2: 1.375rem;
    --fs-h3: 1.125rem;
    --fs-body-lg: 1rem;
    --sp-4xl: 64px;
    --sp-3xl: 48px;
  }

  .container {
    padding: 0 var(--sp-md);
  }

  .section {
    padding: var(--sp-3xl) 0;
  }

  .section__header {
    margin-bottom: var(--sp-2xl);
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + var(--sp-xl));
    padding-bottom: var(--sp-3xl);
  }

  .hero__content {
    padding: var(--sp-xl) 0;
  }

  .hero__cta {
    flex-direction: column;
  }

  .hero__cta .btn {
    width: 100%;
  }

  .header__register {
    display: none;
  }

  .header__download span {
    display: none;
  }

  .lang-switcher__current {
    display: none;
  }

  .mobile-menu {
    display: block;
  }

  .mobile-menu[hidden] {
    display: none;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-md);
  }

  .trust-item {
    padding: var(--sp-md);
  }

  .trust-item__value {
    font-size: var(--fs-h3);
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-md);
  }

  .feature-card {
    padding: var(--sp-lg);
  }

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

  .register-steps {
    grid-template-columns: 1fr;
  }

  .final-cta {
    padding: var(--sp-2xl) var(--sp-lg);
  }

  .final-cta__buttons {
    flex-direction: column;
  }

  .final-cta__buttons .btn {
    width: 100%;
  }

  .footer__inner {
    flex-direction: column;
    gap: var(--sp-lg);
  }

  .footer__nav {
    gap: var(--sp-md);
  }

  /* Show Sticky CTA on mobile */
  .sticky-cta {
    display: flex;
  }

  /* Add bottom padding for sticky CTA */
  body {
    padding-bottom: 72px;
  }

  .download-card {
    padding: var(--sp-lg);
  }
}

/* ---------- Responsive: Small Mobile ---------- */
@media (max-width: 480px) {
  .hero__title {
    font-size: 1.75rem;
  }

  .hero__eyebrow {
    font-size: var(--fs-caption);
  }

  .btn--large {
    padding: 14px 24px;
    font-size: var(--fs-body);
    min-height: 48px;
  }

  .download-btn--large {
    min-height: 52px;
    padding: var(--sp-sm) var(--sp-md);
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Print ---------- */
@media print {
  .header, .sticky-cta, .hero__bg, .final-cta__bg {
    display: none;
  }
}