/* ═══════════════════════════════════════════════
   CSS Custom Properties — Light Theme
════════════════════════════════════════════════ */
:root {
  /* Colors */
  --color-bg-base:      #f8fafc;
  --color-bg-surface:   #ffffff;
  --color-bg-elevated:  #eff6ff;
  --color-border:       #dbeafe;
  --color-accent:       #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-glow:  rgba(37, 99, 235, 0.08);
  --color-accent-glow-strong: rgba(37, 99, 235, 0.2);
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted:   #94a3b8;
  --color-red:          #dc2626;
  --color-yellow:       #d97706;
  --color-green:        #16a34a;
  --color-pro-gold:     #d97706;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Layout */
  --container-max: 1200px;
  --nav-height: 64px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-med:  280ms ease;
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 50%, #f1f5f9 100%);
  background-attachment: fixed;
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

ul { list-style: none; }

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

/* ═══════════════════════════════════════════════
   Utilities
════════════════════════════════════════════════ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-gradient {
  background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.875rem;
  background: var(--color-accent-glow);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3.5rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.875rem;
  color: var(--color-text-primary);
}

.section-header p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
}

/* ═══════════════════════════════════════════════
   Buttons
════════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn:active { transform: scale(0.97); }

.btn-sm  { padding: 0.4rem 0.875rem; font-size: 0.875rem; }
.btn-lg  { padding: 0.75rem 1.5rem;  font-size: 1rem; }
.btn-xl  { padding: 1rem 2.25rem;    font-size: 1.0625rem; }
.btn-full { width: 100%; justify-content: center; }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 20px var(--color-accent-glow-strong);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-glow);
}

/* ═══════════════════════════════════════════════
   Scroll Reveal Animations
════════════════════════════════════════════════ */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  transition-delay: var(--delay, 0s);
}

.animate-in.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .animate-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}

/* ═══════════════════════════════════════════════
   NAVBAR
════════════════════════════════════════════════ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background var(--transition-med), box-shadow var(--transition-med), border-bottom-color var(--transition-med);
  border-bottom: 1px solid transparent;
}

#navbar.scrolled {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 16px rgba(37, 99, 235, 0.08);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.nav-logo-text {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover { color: var(--color-accent); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-lang {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.3rem 0.625rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.btn-lang:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-glow);
}

.btn-lang:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Show/hide lang spans based on html[lang] */
[data-show-when="zh"] { display: none; }
:root[lang="zh"] [data-show-when="zh"] { display: inline; }
:root[lang="zh"] [data-show-when="en"] { display: none; }

.btn-hamburger {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.3rem;
  cursor: pointer;
  color: var(--color-text-primary);
  align-items: center;
  justify-content: center;
}

.btn-hamburger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn-hamburger .icon-close { display: none; }

#navbar.nav-open .btn-hamburger .icon-menu  { display: none; }
#navbar.nav-open .btn-hamburger .icon-close { display: block; }

/* ═══════════════════════════════════════════════
   HERO
════════════════════════════════════════════════ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 3rem) 0 4rem;
  position: relative;
  overflow: hidden;
  background: #ffffff;
}

#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 90% 70% at 60% -5%, rgba(37, 99, 235, 0.1) 0%, transparent 65%),
    radial-gradient(ellipse 60% 50% at -10% 80%, rgba(79, 70, 229, 0.06) 0%, transparent 60%),
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(37,99,235,0.03) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(37,99,235,0.03) 40px);
  pointer-events: none;
}

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

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hero-text h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  align-items: center;
}

.hero-trust {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ── Screenshot Frame ── */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.screenshot-frame {
  width: 100%;
  max-width: 580px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(37, 99, 235, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
  background: var(--color-bg-elevated);
}

.screenshot-titlebar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.625rem 0.875rem;
  background: #f0f9ff;
  border-bottom: 1px solid var(--color-border);
}

.titlebar-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }

.titlebar-title {
  flex: 1;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

#app-screenshot {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Screenshot Fallback Mockup ── */
.screenshot-fallback {
  padding: 0;
  font-size: 0.8125rem;
  font-family: var(--font-sans);
  background: #ffffff;
}

.mock-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.875rem;
  background: #f0f9ff;
  border-bottom: 1px solid var(--color-border);
}

.mock-path {
  font-family: 'Consolas', monospace;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.mock-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-green);
  background: rgba(22, 163, 74, 0.1);
  border: 1px solid rgba(22, 163, 74, 0.25);
  border-radius: 4px;
  padding: 0.125rem 0.5rem;
}

.mock-list {
  padding: 0.375rem 0;
}

.mock-row {
  display: grid;
  grid-template-columns: 20px 1fr auto 120px;
  gap: 0.5rem;
  align-items: center;
  padding: 0.4rem 0.875rem;
  transition: background var(--transition-fast);
}

.mock-row:hover { background: var(--color-bg-elevated); }
.mock-icon { font-size: 0.875rem; }
.mock-name { font-size: 0.8125rem; color: var(--color-text-primary); }
.mock-size { font-size: 0.75rem; font-weight: 600; font-family: 'Consolas', monospace; }

.mock-bar {
  height: 6px;
  background: var(--color-bg-elevated);
  border-radius: 3px;
  overflow: hidden;
}

.mock-bar-fill {
  height: 100%;
  width: var(--w, 50%);
  background: var(--bar-color, var(--color-accent));
  border-radius: 3px;
}

.mock-statusbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0.875rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  background: #f0f9ff;
}

/* ═══════════════════════════════════════════════
   STATS BAR
════════════════════════════════════════════════ */
#stats {
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem;
  border-right: 1px solid var(--color-border);
  text-align: center;
}

.stat-item:last-child { border-right: none; }

.stat-number {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-number--text {
  font-size: clamp(1.375rem, 2.5vw, 1.875rem);
  letter-spacing: 0;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ═══════════════════════════════════════════════
   FEATURES
════════════════════════════════════════════════ */
#features {
  padding: 6rem 0;
  background: var(--color-bg-base);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition:
    border-color var(--transition-med),
    transform var(--transition-med),
    box-shadow var(--transition-med);
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.04);
}

.feature-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
}

.feature-card--highlight {
  border-color: rgba(37, 99, 235, 0.4);
  background: linear-gradient(135deg, #ffffff 0%, rgba(37,99,235,0.04) 100%);
}

.feature-card-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem;
  background: var(--color-accent-glow);
  border: 1px solid rgba(37,99,235,0.3);
  border-radius: 4px;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-glow);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ═══════════════════════════════════════════════
   TIMELINE SHOWCASE
════════════════════════════════════════════════ */
#timeline {
  padding: 6rem 0;
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.timeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: start;
}

@media (min-width: 1024px) {
  .timeline-grid {
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
  }
}

.timeline-text {
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
}

.timeline-text h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.timeline-text > p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.timeline-bullets li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  padding: 0.4rem 0.75rem;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--color-accent);
}

/* ── Timeline Panel Mockup ── */
.timeline-panel-mock {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-size: 0.8125rem;
  box-shadow: 0 4px 24px rgba(37, 99, 235, 0.1);
}

.tlm-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6875rem 1rem;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.tlm-drive {
  margin-left: auto;
  font-family: 'Consolas', monospace;
  font-size: 0.75rem;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.tlm-compare-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: rgba(37,99,235,0.04);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.75rem;
}

.tlm-date {
  font-family: 'Consolas', monospace;
  color: var(--color-text-secondary);
  font-size: 0.75rem;
}

.tlm-arrow {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  flex: 1;
  text-align: center;
}

.tlm-summary {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  background: rgba(220, 38, 38, 0.03);
}

.tlm-summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tlm-summary-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.tlm-summary-delta {
  font-size: 0.9375rem;
  font-weight: 700;
  font-family: 'Consolas', monospace;
}

.tlm-section {
  padding: 0.625rem 0 0.375rem;
  border-bottom: 1px solid var(--color-border);
}

.tlm-section:last-of-type { border-bottom: none; }

.tlm-section-title {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0 1rem 0.375rem;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tlm-row {
  display: grid;
  grid-template-columns: 1fr auto 80px;
  gap: 0.5rem;
  align-items: center;
  padding: 0.3rem 1rem;
}

.tlm-row:hover { background: var(--color-bg-elevated); }

.tlm-name {
  font-family: 'Consolas', monospace;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tlm-change {
  font-family: 'Consolas', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.tlm-bar {
  height: 5px;
  background: var(--color-bg-elevated);
  border-radius: 3px;
  overflow: hidden;
}

.tlm-bar-fill {
  height: 100%;
  width: var(--w, 50%);
  background: var(--bar-color, var(--color-accent));
  border-radius: 3px;
}

.tlm-ai-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(37,99,235,0.05);
  border-top: 1px solid var(--color-border);
  cursor: default;
}

.tlm-ai-btn span:nth-child(2) { flex: 1; }

/* ═══════════════════════════════════════════════
   PRICING
════════════════════════════════════════════════ */
#pricing {
  padding: 6rem 0;
  background: var(--color-bg-base);
}

/* ── Shared elements retained from old design ── */
.pricing-tier {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.pricing-header-top {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.badge-pro {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  background: rgba(217, 119, 6, 0.1);
  border: 1px solid rgba(217, 119, 6, 0.3);
  border-radius: 4px;
  color: var(--color-pro-gold);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 0.375rem;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-text-primary);
}

.price-period {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  flex: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  font-size: 0.9375rem;
}

.feat-icon {
  flex-shrink: 0;
  width: 18px;
  text-align: center;
  font-size: 0.8125rem;
  margin-top: 0.1rem;
  font-weight: 700;
}

.feat-yes  .feat-icon { color: var(--color-green); }
.feat-limit .feat-icon { color: var(--color-yellow); }
.feat-no   .feat-icon { color: var(--color-text-muted); }

.feat-yes  span:last-child { color: var(--color-text-primary); }
.feat-limit span:last-child { color: var(--color-text-secondary); }
.feat-no   span:last-child { color: var(--color-text-muted); }

/* ── Free vs Pro comparison row ── */
.pricing-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  max-width: 820px;
  margin: 0 auto 2.5rem;
}

@media (max-width: 640px) {
  .pricing-compare {
    grid-template-columns: 1fr;
  }
}

.pricing-compare-col {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: 0 2px 12px rgba(37, 99, 235, 0.05);
}

.pricing-compare-col--pro {
  border-color: var(--color-accent);
  background: linear-gradient(135deg, #eff6ff 0%, #eef2ff 100%);
  box-shadow: 0 4px 24px rgba(37, 99, 235, 0.14);
}

.pricing-compare-header {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.pricing-pro-sub {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ── Subscription tier cards ── */
.pricing-tiers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-width: 960px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .pricing-tiers {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .pricing-tiers {
    grid-template-columns: 1fr;
  }
}

.tier-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: 0 1px 6px rgba(37, 99, 235, 0.05);
  transition: border-color var(--transition-med), transform var(--transition-med), box-shadow var(--transition-med);
  position: relative;
}

.tier-card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
}

/* Best value card */
.tier-card--best {
  border-color: var(--color-accent);
  background: linear-gradient(135deg, #eff6ff 0%, #eef2ff 100%);
  box-shadow: 0 4px 24px rgba(37, 99, 235, 0.16);
}

/* Lifetime card */
.tier-card--lifetime {
  border-color: rgba(217, 119, 6, 0.35);
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 60%, #fff 100%);
}

.tier-card--lifetime:hover {
  border-color: var(--color-pro-gold);
  box-shadow: 0 8px 24px rgba(217, 119, 6, 0.15);
}

.tier-badge {
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.625rem;
  border-radius: 999px;
  white-space: nowrap;
}

.tier-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  padding-top: 0.25rem;
}

.tier-price {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.tier-amount {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--color-text-primary);
}

.tier-card--best .tier-amount {
  color: var(--color-accent);
}

.tier-card--lifetime .tier-amount {
  color: var(--color-pro-gold);
}

.tier-period {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.tier-note {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  flex: 1;
}

.tier-save {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-green);
}

.tier-btn {
  font-size: 0.875rem;
  padding: 0.5rem 0.875rem;
  margin-top: auto;
}

.pricing-guarantee-center {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 2rem;
}

/* ═══════════════════════════════════════════════
   DOWNLOAD CTA
════════════════════════════════════════════════ */
#download {
  padding: 6rem 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 50%, #dbeafe 100%);
}

#download::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 80% at 50% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.download-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.download-inner h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.download-inner > p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.download-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ═══════════════════════════════════════════════
   PROBLEM SECTION
════════════════════════════════════════════════ */
#problem {
  padding: 5rem 0;
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
}

.problem-header {
  text-align: center;
  max-width: 900px;
  margin: 0 auto 3rem;
}

.problem-header h2 {
  font-size: clamp(1.625rem, 3vw, 2.125rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.875rem;
  color: var(--color-text-primary);
}

.problem-header p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.problem-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  max-width: 900px;
  margin: 0 auto;
}

.problem-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.04);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}

.problem-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.1);
}

.problem-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.problem-icon--red   { background: #fee2e2; color: #dc2626; }
.problem-icon--orange { background: #ffedd5; color: #ea580c; }
.problem-icon--yellow { background: #fef3c7; color: #d97706; }

.problem-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.problem-card p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════
   FOOTER
════════════════════════════════════════════════ */
footer {
  background: #0f172a;
  color: #e2e8f0;
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .footer-brand { grid-column: 1 / -1; }
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  margin-bottom: 0.875rem;
}

.footer-brand-logo span {
  font-size: 1.0625rem;
  font-weight: 700;
  color: #f8fafc;
}

.footer-brand p {
  font-size: 0.875rem;
  color: #94a3b8;
  line-height: 1.6;
  max-width: 240px;
}

.footer-col h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #f8fafc;
  margin-bottom: 1rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-col ul li a {
  font-size: 0.875rem;
  color: #94a3b8;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover { color: #f8fafc; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: #64748b;
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  font-size: 0.8125rem;
  color: #64748b;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover { color: #f8fafc; }

/* ═══════════════════════════════════════════════
   RESPONSIVE — Mobile (< 768px)
════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 0;
    z-index: 99;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08);
  }

  #navbar.nav-open .nav-links {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    width: 100%;
  }

  .btn-hamburger {
    display: inline-flex;
  }

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

  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .stat-item:last-child { border-bottom: none; }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 400px) {
  .container { padding: 0 1rem; }
  .mock-row { grid-template-columns: 20px 1fr auto; }
  .mock-bar { display: none; }
}