/* ══════════════════════════════════════════════════════════════
   ABRIS.AI — Official Web & Engineering CAD Design System
   No emojis. 100% Crisp Vector Geometry, Typography & Minimalism.
   ══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg: #F8F9FB;
  --surface: #FFFFFF;
  --surface-subtle: #F1F4F9;
  --border: #E2E8F0;
  --border-focus: #0066FF;
  
  --text-main: #0B1220;
  --text-muted: #5A6A80;
  --text-dim: #8C9BAE;
  
  --primary: #0066FF;
  --primary-hover: #0052CC;
  --primary-subtle: #EBF3FF;
  
  --success: #10B981;
  --success-subtle: #ECFDF5;
  --warning: #F59E0B;
  --warning-subtle: #FFFBEB;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --shadow-sm: 0 1px 2px rgba(11, 18, 32, 0.04);
  --shadow-md: 0 4px 16px -2px rgba(11, 18, 32, 0.06), 0 2px 6px -1px rgba(11, 18, 32, 0.04);
  --shadow-lg: 0 12px 32px -4px rgba(11, 18, 32, 0.08), 0 4px 12px -2px rgba(11, 18, 32, 0.04);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --max-width: 1200px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(rgba(11, 18, 32, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

p {
  color: var(--text-muted);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  transition: var(--transition);
}

.mono {
  font-family: var(--font-mono);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ══════════════════════════════════════════════════════════════
   NAVIGATION
   ══════════════════════════════════════════════════════════════ */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 249, 251, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: var(--text-main);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--primary);
  color: #FFFFFF;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-link:hover {
  color: var(--primary);
}

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

.lang-select {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  outline: none;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(0, 102, 255, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-dark {
  background: var(--text-main);
  color: #FFFFFF;
}

.btn-dark:hover {
  background: #1E293B;
  transform: translateY(-1px);
}

.btn-outline {
  background: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--text-main);
  background: var(--surface-subtle);
}

.btn-lg {
  padding: 14px 26px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

/* ══════════════════════════════════════════════════════════════
   HERO SECTION
   ══════════════════════════════════════════════════════════════ */

.hero {
  padding: 72px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.12;
  margin-bottom: 20px;
  font-weight: 800;
  letter-spacing: -0.035em;
}

.hero-title span {
  color: var(--primary);
}

.hero-sub {
  font-size: 1.125rem;
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.8125rem;
  color: var(--text-dim);
  font-weight: 500;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* CAD Interactive Preview Box */
.cad-hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.cad-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: #F8F9FA;
  border-bottom: 1px solid var(--border);
  font-size: 0.8125rem;
}

.cad-dots {
  display: flex;
  gap: 6px;
}

.cad-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #CBD5E1;
}

.cad-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--success);
}

.cad-canvas-wrap {
  position: relative;
  height: 380px;
  background: #0B1220;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
}

.cad-svg-plan {
  width: 90%;
  height: 90%;
}

.cad-footer {
  padding: 16px 20px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  text-align: center;
}

.cad-metric-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.cad-metric-val {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
}

/* ══════════════════════════════════════════════════════════════
   STATS STRIP
   ══════════════════════════════════════════════════════════════ */

.stats-strip {
  padding: 24px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 80px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 12px;
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}

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

/* ══════════════════════════════════════════════════════════════
   FEATURES SECTION
   ══════════════════════════════════════════════════════════════ */

.section {
  padding: 80px 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.375rem;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.section-desc {
  font-size: 1.0625rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: #CBD5E1;
  box-shadow: var(--shadow-md);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ══════════════════════════════════════════════════════════════
   HOW IT WORKS / ARCHITECTURE
   ══════════════════════════════════════════════════════════════ */

.workflow-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-top: 40px;
}

.workflow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}

.step-item {
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

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

/* ══════════════════════════════════════════════════════════════
   PRICING
   ══════════════════════════════════════════════════════════════ */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #FFFFFF;
  padding: 3px 12px;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-full);
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.875rem;
  margin-bottom: 24px;
}

.plan-price {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}

.plan-price span {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  margin: 28px 0;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.plan-feature-item svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--success);
}

/* ══════════════════════════════════════════════════════════════
   FAQ SECTION
   ══════════════════════════════════════════════════════════════ */

.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
}

.faq-question:hover {
  background: var(--surface-subtle);
}

.faq-chevron {
  transition: transform 0.2s ease;
  color: var(--text-dim);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

/* ══════════════════════════════════════════════════════════════
   PWA MODAL (iOS Guide)
   ══════════════════════════════════════════════════════════════ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 18, 32, 0.6);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 100%;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  transform: scale(0.96);
  transition: transform 0.25s ease;
}

.modal-backdrop.open .modal-card {
  transform: scale(1);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 1.25rem;
}

.modal-close {
  color: var(--text-dim);
  padding: 4px;
}

.modal-close:hover {
  color: var(--text-main);
}

.ios-step {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
}

.ios-step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8125rem;
  flex-shrink: 0;
}

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

/* ══════════════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════════════ */

.footer {
  background: #0B1220;
  color: #94A3B8;
  padding: 64px 0 32px;
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  color: #FFFFFF;
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.footer-desc {
  color: #64748B;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col-title {
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-link-item {
  margin-bottom: 10px;
}

.footer-link-item a {
  color: #94A3B8;
}

.footer-link-item a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid #1E293B;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #64748B;
  font-size: 0.8125rem;
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════ */

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .workflow-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  
  .hero {
    padding: 40px 0 50px;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .workflow-steps {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}