/* OK Web Design — v1.0.0 */

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  --color-accent: #f59e0b;
  --color-border: #e5e7eb;
  --color-dark: #111827;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
  --max-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
}

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

/* Typography */
h1, h2, h3 {
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); letter-spacing: -0.02em; }
h3 { font-size: 1.125rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font);
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

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

.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

.btn-full {
  width: 100%;
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo span {
  font-weight: 500;
  color: var(--color-text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}

/* Hero */
.hero {
  padding: 160px 0 100px;
  text-align: center;
}

.hero-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-top: 20px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 36px;
}

/* Problem */
.problem {
  padding: 80px 0;
  background: var(--color-surface);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  text-align: center;
  padding: 32px 24px;
}

.problem-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #fef2f2;
  color: #ef4444;
  margin-bottom: 16px;
}

.problem-card h3 {
  margin-bottom: 8px;
}

.problem-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Section Tags */
.section-tag {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

/* Services */
.services {
  padding: 100px 0;
}

.services h2 {
  margin-bottom: 48px;
}

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

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.service-card h3 {
  margin-bottom: 8px;
  color: var(--color-text);
}

.service-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Work / Portfolio */
.work {
  padding: 100px 0;
  background: var(--color-surface);
}

.work h2 {
  margin-bottom: 48px;
}

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

.work-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.2s;
}

.work-card:hover {
  box-shadow: var(--shadow-lg);
}

.work-placeholder {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.work-placeholder span {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.work-card h3,
.work-card p {
  padding: 0 20px;
}

.work-card h3 {
  padding-top: 16px;
  margin-bottom: 4px;
}

.work-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding-bottom: 20px;
}

/* AI SEO */
.ai-seo {
  padding: 100px 0;
}

.ai-seo h2 {
  margin-bottom: 8px;
}

.ai-seo-sub {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 48px;
  max-width: 560px;
}

.ai-seo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.ai-seo-step {
  padding: 32px;
  background: var(--color-primary-light);
  border-radius: var(--radius);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.ai-seo-step h3 {
  margin-bottom: 8px;
}

.ai-seo-step p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .ai-seo-grid {
    grid-template-columns: 1fr;
  }
}

/* Pricing */
.pricing {
  padding: 100px 0;
}

.pricing h2 {
  margin-bottom: 48px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 760px;
  margin: 0 auto;
}

.pricing-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  position: relative;
}

.pricing-card:first-child {
  border-color: var(--color-primary);
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 32px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.price {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.price span {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.price-note {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.pricing-list {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--color-text);
}

.pricing-list svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Social Proof */
.proof {
  padding: 80px 0;
  background: var(--color-dark);
  color: #fff;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  text-align: center;
}

.proof-number {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.proof p {
  color: #9ca3af;
  font-size: 0.9rem;
}

/* Contact */
.contact {
  padding: 100px 0;
  background: var(--color-surface);
}

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

.contact-sub {
  color: var(--color-text-muted);
  margin-bottom: 40px;
}

.contact-form {
  max-width: 640px;
}

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

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.2s;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #9ca3af;
}

.form-group textarea {
  resize: vertical;
}

/* Form Messages */
.form-message {
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  background: #ecfdf5;
  border: 1px solid #6ee7b7;
  color: #065f46;
  margin-bottom: 24px;
  font-weight: 500;
}

.form-message.form-error {
  background: #fef2f2;
  border-color: #fca5a5;
  color: #991b1b;
}

/* Footer */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  text-align: center;
}

.footer .logo {
  display: inline-block;
  margin-bottom: 8px;
}

.footer p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-copy {
  margin-top: 16px;
  font-size: 0.8rem !important;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 24px;
    gap: 16px;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .problem-grid,
  .services-grid,
  .work-grid,
  .proof-grid {
    grid-template-columns: 1fr;
  }

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

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

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 100px 0 50px;
  }

  .hero-sub br {
    display: none;
  }

  .pricing-card {
    padding: 32px 24px;
  }
}