/* ===========================
   Selix — ERP Landing Page
   =========================== */

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

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #0ea5e9;
  --color-dark: #0f172a;
  --color-text: #334155;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --color-success: #16a34a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

/* --- Header --- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-list a {
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}

.btn-sm { padding: 8px 18px; font-size: 0.8rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-full { width: 100%; }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-success {
  background: var(--color-success) !important;
  box-shadow: none !important;
  transform: none !important;
}

/* --- Hero --- */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.2;
  max-width: 800px;
  margin: 0 auto 24px;
  letter-spacing: -0.03em;
}

.highlight {
  color: var(--color-primary);
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Sections --- */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.section h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-intro {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 640px;
  margin-bottom: 48px;
  line-height: 1.8;
}

/* --- Grids --- */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* --- Cards --- */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- Info Box --- */
.info-box {
  margin-top: 48px;
  padding: 24px 32px;
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.info-box p {
  font-size: 1rem;
  color: var(--color-dark);
  line-height: 1.8;
}

/* --- Problem Cards --- */
.problem-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  position: relative;
  transition: all var(--transition);
}

.problem-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.problem-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary-light);
  line-height: 1;
  margin-bottom: 12px;
}

.problem-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.problem-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- Benefits --- */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.benefit {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 24px;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.benefit:hover {
  background: var(--color-bg-alt);
}

.benefit-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.benefit h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.benefit p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- Comparison --- */
.comparison {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.comparison-col {
  padding: 32px;
  border-radius: var(--radius);
}

.comparison-old {
  background: #fef2f2;
  border: 1px solid #fecaca;
}

.comparison-new {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
}

.comparison-col h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-dark);
}

.comparison-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.comparison-col li {
  font-size: 0.95rem;
  padding-left: 8px;
  line-height: 1.6;
}

.comparison-old li {
  color: #991b1b;
}

.comparison-new li {
  color: #166534;
}

/* --- Marketplace Cards --- */
.marketplace-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
}

.marketplace-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.marketplace-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.marketplace-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- Marketplace Flow --- */
.marketplace-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 48px;
  padding: 32px;
  background: var(--color-primary-light);
  border-radius: var(--radius);
  flex-wrap: wrap;
}

.flow-step {
  text-align: center;
  flex: 1;
  min-width: 120px;
}

.flow-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.flow-step p {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-dark);
  line-height: 1.5;
}

.flow-arrow {
  font-size: 1.5rem;
  color: var(--color-primary);
  font-weight: 700;
}

/* --- CTA Section --- */
.section-cta {
  background: linear-gradient(135deg, var(--color-dark) 0%, #1e293b 100%);
  color: #fff;
  text-align: center;
}

.section-cta h2 {
  color: #fff;
}

.section-cta .section-intro {
  color: #94a3b8;
  margin-left: auto;
  margin-right: auto;
}

.cta-detail {
  font-size: 1.1rem;
  color: #cbd5e1;
  margin-bottom: 40px;
}

/* --- Waitlist Form --- */
.waitlist-form {
  max-width: 560px;
  margin: 0 auto;
  text-align: left;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 6px;
}

.form-group input,
.form-group select {
  padding: 12px 16px;
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  background: #1e293b;
  color: #fff;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.form-group input::placeholder {
  color: #64748b;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.2);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.form-group select option {
  background: #1e293b;
  color: #fff;
}

.waitlist-form .btn {
  margin-top: 8px;
}

.form-note {
  text-align: center;
  font-size: 0.8rem;
  color: #64748b;
  margin-top: 12px;
}

/* --- FAQ --- */
.faq-list {
  max-width: 720px;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item summary {
  padding: 20px 0;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-text-light);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item p {
  padding: 0 0 20px;
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* --- Footer --- */
.footer {
  background: var(--color-dark);
  color: #94a3b8;
  padding: 64px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid #1e293b;
}

.footer-brand .logo-text {
  color: #fff;
  display: block;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-links h4 {
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 0.8rem;
}

/* --- Animations --- */
.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 24px;
    box-shadow: var(--shadow-lg);
  }

  .nav-open { display: block; }

  .nav-list {
    flex-direction: column;
    gap: 16px;
  }

  .nav-list a { font-size: 1rem; }

  .menu-toggle { display: flex; }

  .header-inner .btn-sm { display: none; }

  .hero { padding: 120px 0 72px; }

  .section { padding: 64px 0; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }

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

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

  .form-row { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 32px; }

  .marketplace-flow {
    flex-direction: column;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.75rem; }
  .hero-sub { font-size: 1rem; }
  .section h2 { font-size: 1.5rem; }
}