/* ================================================
   BPIN.AI Design System
   ================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
  --color-primary: #1E3A5F;
  --color-accent: #0EA5E9;
  --color-accent-dark: #0284C7;
  --color-success: #10B981;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #1E293B;
  --color-muted: #64748B;
  --color-border: #E2E8F0;
  --color-hero-gradient: linear-gradient(135deg, #1E3A5F 0%, #0EA5E9 100%);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 3.5rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

  --transition: 0.2s ease;
  --section-padding: 80px 0;
  --container-max: 1200px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Typography --- */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; color: var(--color-primary); }
h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-3xl); font-weight: 600; }
h3 { font-size: var(--font-size-xl); font-weight: 600; }
h4 { font-size: var(--font-size-lg); font-weight: 600; }
p { color: var(--color-text); }
.text-muted { color: var(--color-muted); }
.text-center { text-align: center; }
.text-white { color: #fff; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-family);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}
.btn-outline-white {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.7);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  color: #fff;
  text-decoration: none;
}
.btn-lg { padding: 16px 36px; font-size: var(--font-size-lg); }

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.badge-success { background: rgba(16,185,129,0.12); color: var(--color-success); }
.badge-accent  { background: rgba(14,165,233,0.12); color: var(--color-accent); }

/* --- Navigation --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}
.navbar-logo:hover { text-decoration: none; }
.logo-dot { color: var(--color-accent); }
.navbar-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.navbar-links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: var(--font-size-sm);
  transition: color var(--transition);
  text-decoration: none;
}
.navbar-links a:hover, .navbar-links a.active { color: var(--color-accent); }
.navbar-actions { display: flex; align-items: center; gap: 12px; }
.navbar-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.navbar-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition);
  border-radius: 2px;
}
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 16px 24px 24px;
  gap: 16px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}
.mobile-menu a {
  color: var(--color-text);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}
.mobile-menu.open { display: flex; }

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .navbar-logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: var(--font-size-sm); line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: var(--font-size-sm); margin-bottom: 16px; letter-spacing: 0.05em; text-transform: uppercase; }
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.65);
  font-size: var(--font-size-sm);
  margin-bottom: 10px;
  transition: color var(--transition);
}
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-sm);
}
.footer-bottom a { color: rgba(255,255,255,0.65); }
.footer-bottom a:hover { color: #fff; }

/* --- Section Utilities --- */
.section { padding: var(--section-padding); }
.section-light { background: var(--color-bg); }
.section-white { background: var(--color-surface); }
.section-accent { background: var(--color-hero-gradient); color: #fff; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: var(--font-size-lg); color: var(--color-muted); max-width: 600px; margin: 0 auto; }

/* --- Card --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-icon {
  width: 48px;
  height: 48px;
  background: rgba(14,165,233,0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 24px;
}
.card h3 { margin-bottom: 8px; font-size: var(--font-size-lg); }
.card p { color: var(--color-muted); font-size: var(--font-size-sm); line-height: 1.6; }

/* --- Grid Layouts --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* --- Hero --- */
.hero {
  background: var(--color-hero-gradient);
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--color-bg);
  clip-path: ellipse(55% 100% at 50% 100%);
}
.hero-content { max-width: 760px; }
.hero-badge { margin-bottom: 20px; }
.hero h1 { color: #fff; margin-bottom: 24px; line-height: 1.15; }
.hero-sub { font-size: var(--font-size-xl); color: rgba(255,255,255,0.85); margin-bottom: 40px; max-width: 600px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-page {
  background: var(--color-hero-gradient);
  padding: 72px 0 60px;
  text-align: center;
}
.hero-page h1 { color: #fff; font-size: var(--font-size-4xl); margin-bottom: 16px; }
.hero-page p { color: rgba(255,255,255,0.8); font-size: var(--font-size-xl); max-width: 560px; margin: 0 auto; }

/* --- Stats Strip --- */
.stats-strip { background: var(--color-surface); padding: 48px 0; border-bottom: 1px solid var(--color-border); }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; text-align: center; }
.stat-number { font-size: var(--font-size-4xl); font-weight: 700; color: var(--color-primary); line-height: 1; }
.stat-label { font-size: var(--font-size-sm); color: var(--color-muted); margin-top: 6px; }

/* --- How It Works --- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; position: relative; }
.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 16.67%;
  right: 16.67%;
  height: 2px;
  background: var(--color-border);
}
.step { text-align: center; }
.step-number {
  width: 56px;
  height: 56px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0 auto 20px;
  position: relative;
  z-index: 1;
}
.step h3 { margin-bottom: 8px; }
.step p { color: var(--color-muted); font-size: var(--font-size-sm); }

/* --- CTA Banner --- */
.cta-banner { background: var(--color-hero-gradient); padding: 80px 0; text-align: center; }
.cta-banner h2 { color: #fff; margin-bottom: 16px; }
.cta-banner p { color: rgba(255,255,255,0.8); font-size: var(--font-size-lg); margin-bottom: 36px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* --- Feature Detail Section (2-col) --- */
.feature-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 64px 0;
  border-bottom: 1px solid var(--color-border);
}
.feature-section:last-child { border-bottom: none; }
.feature-section.reverse { direction: rtl; }
.feature-section.reverse > * { direction: ltr; }
.feature-content .badge { margin-bottom: 16px; }
.feature-content h2 { font-size: var(--font-size-2xl); margin-bottom: 16px; }
.feature-content p { color: var(--color-muted); margin-bottom: 24px; }
.feature-list { display: flex; flex-direction: column; gap: 10px; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: var(--font-size-sm);
  color: var(--color-text);
}
.feature-list li::before { content: '✓'; color: var(--color-success); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.feature-visual {
  background: linear-gradient(135deg, #EFF6FF, #E0F2FE);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  min-height: 280px;
  border: 1px solid var(--color-border);
}

/* --- Pricing --- */
.pricing-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
}
.pricing-toolbar-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.pricing-toolbar-note {
  color: var(--color-muted);
  font-size: var(--font-size-sm);
}
.pricing-currency-toggle,
.pricing-billing-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg);
}
.pricing-currency-btn {
  border: none;
  background: transparent;
  color: var(--color-muted);
  border-radius: var(--radius-full);
  padding: 10px 16px;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}
.pricing-currency-btn.is-active {
  background: var(--color-accent);
  color: #fff;
}
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: start; }
.pricing-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
}
.pricing-card.featured {
  border-color: var(--color-accent);
  position: relative;
}
.pricing-card.featured::before {
  content: 'Most Popular';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  font-size: var(--font-size-xs);
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}
.pricing-name { font-size: var(--font-size-sm); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-muted); margin-bottom: 8px; }
.pricing-price {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}
.pricing-price .price-amount { font-size: var(--font-size-4xl); font-weight: 700; color: var(--color-primary); line-height: 1; }
.pricing-price .price-period { font-size: var(--font-size-base); color: var(--color-muted); font-weight: 400; margin-bottom: 4px; }
.pricing-desc { font-size: var(--font-size-sm); color: var(--color-muted); margin-bottom: 28px; }
.pricing-features { display: flex; flex-direction: column; gap: 10px; margin-bottom: 32px; }
.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: var(--font-size-sm);
}
.pricing-features li .check { color: var(--color-success); font-weight: 700; flex-shrink: 0; }
.pricing-features li .cross { color: #CBD5E1; flex-shrink: 0; }
.pricing-card .btn { width: 100%; justify-content: center; }

/* --- Comparison Table --- */
.comparison-table { width: 100%; border-collapse: collapse; margin-top: 48px; }
.comparison-table th, .comparison-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}
.comparison-table th { background: var(--color-bg); font-weight: 600; color: var(--color-primary); }
.comparison-table th:not(:first-child), .comparison-table td:not(:first-child) { text-align: center; }
.comparison-table td .yes { color: var(--color-success); font-size: 18px; }
.comparison-table td .no { color: #CBD5E1; font-size: 18px; }
.comparison-table tr:hover td { background: #F8FAFC; }

/* --- FAQ --- */
.faq { display: flex; flex-direction: column; gap: 0; }
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 20px 0;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-family);
}
.faq-question::after { content: '+'; font-size: var(--font-size-xl); color: var(--color-accent); font-weight: 400; flex-shrink: 0; }
.faq-question.open::after { content: '−'; }
.faq-answer { display: none; padding: 0 0 20px; color: var(--color-muted); font-size: var(--font-size-sm); line-height: 1.7; }
.faq-answer.open { display: block; }

/* --- Contact Form --- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text); }
.form-group input, .form-group select, .form-group textarea {
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-error { font-size: var(--font-size-xs); color: #EF4444; display: none; }
.form-error.visible { display: block; }
.form-success {
  display: none;
  background: rgba(16,185,129,0.08);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: var(--color-success);
  font-weight: 600;
  margin-top: 16px;
}
.form-success.visible { display: block; }

/* --- Fade-in Animation --- */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* --- Responsive --- */
@media (max-width: 1024px) {
  h1 { font-size: var(--font-size-4xl); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .pricing-grid { gap: 20px; }
  .pricing-toolbar { flex-direction: column; align-items: flex-start; }
  .pricing-toolbar-controls { width: 100%; }
  .feature-section { gap: 40px; }
}

@media (max-width: 768px) {
  :root { --section-padding: 56px 0; }
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  .navbar-links, .navbar-actions .btn { display: none; }
  .navbar-hamburger { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps::before { display: none; }
  .stats-grid { grid-template-columns: 1fr; gap: 24px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .feature-section { grid-template-columns: 1fr; }
  .feature-section.reverse { direction: ltr; }
  .form-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .cta-actions { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .comparison-table { font-size: var(--font-size-xs); }
  .comparison-table th, .comparison-table td { padding: 10px 8px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  h1 { font-size: var(--font-size-2xl); }
  .hero { padding: 72px 0 60px; }
  .pricing-card { padding: 28px 20px; }
}

/* ========== Platform Grid (About page) ========== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.platform-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.platform-card.live { border-color: var(--color-success); }

.platform-icon {
  font-size: 2.5rem;
  margin-bottom: 8px;
}

.platform-card h3 { font-size: var(--font-size-base); font-weight: 600; color: var(--color-primary); }
.platform-card p  { font-size: var(--font-size-sm); color: var(--color-text-muted); }

.badge-soon {
  display: inline-block;
  background: #F1F5F9;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: .5px;
  text-transform: uppercase;
}

/* ========== Contact Page ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 64px;
  align-items: start;
}

.contact-form-col h2 { margin-bottom: 8px; }

.contact-info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 32px;
}

.contact-info-card h3 { font-size: var(--font-size-lg); margin-bottom: 20px; }

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.contact-info-icon { font-size: 1.4rem; }

.contact-info-item strong { display: block; font-size: var(--font-size-sm); font-weight: 600; }
.contact-info-item a { font-size: var(--font-size-sm); color: var(--color-accent); text-decoration: none; }
.contact-info-item a:hover { text-decoration: underline; }

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