/* ============================================
   TAKGIO — Public Site Styles
   Clean & modern design system (Stripe/Linear aesthetic)
   ============================================ */

/* 1. CSS Custom Properties
   ---------------------------------------- */
:root {
  --color-navy: #1a1a2e;
  --color-navy-light: #16213e;
  --color-accent: #4a6cf7;
  --color-accent-hover: #3a5ce5;
  --color-text: #1a1a2e;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-bg: #fafaf8;
  --color-bg-subtle: #f3f2ef;
  --color-bg-white: #ffffff;
  --color-border: #e4e2dd;
  --color-construction: #f59e0b;
  --color-construction-bg: #fffbeb;
  --color-legal: #8b5cf6;
  --color-legal-bg: #f5f3ff;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1.25rem;
  --space-xl: 2rem;
  --space-2xl: 2.5rem;
  --space-3xl: 3.5rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
}

/* 2. Global Reset
   ---------------------------------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background: var(--color-bg);
}

/* 3. Base Typography
   ---------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.25rem); line-height: 1.1; }
h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 0.875rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; }

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--color-accent-hover); }

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

/* 4. Layout Utilities
   ---------------------------------------- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: var(--space-2xl) 0;
}

.section-alt {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-subtle);
}

.section-navy {
  padding: var(--space-2xl) 0;
  background: var(--color-navy);
  color: #fff;
}
.section-navy p { color: rgba(255,255,255,0.75); }
.section-navy h2,
.section-navy h3 { color: #fff; }

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-lg);
}
.section-header h2 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}
.section-navy .section-header h2 { color: #fff; }
.section-header p {
  font-size: 1.1rem;
}

.grid-2 {
  display: grid;
  gap: var(--space-lg);
}

.grid-3 {
  display: grid;
  gap: var(--space-lg);
}

.grid-4 {
  display: grid;
  gap: var(--space-lg);
}

/* 5. Buttons
   ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-family: inherit;
}

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

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

.btn-white {
  background: #fff;
  color: var(--color-navy);
  border-color: #fff;
}
.btn-white:hover {
  background: rgba(255,255,255,0.9);
  color: var(--color-navy);
}

.btn-lg {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* 6. Site Header
   ---------------------------------------- */
.site-header {
  background: var(--color-navy);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header .logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.08em;
  text-decoration: none;
}
.site-header .logo:hover { color: #fff; }

.site-nav {
  display: none;
  flex-direction: column;
  gap: 0;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-navy);
  padding: 0 1.5rem 1rem;
}
.site-nav.is-open {
  display: flex;
}

.site-nav a {
  color: rgba(255,255,255,0.75);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: color 0.2s;
}
.site-nav a:last-child { border-bottom: none; }
.site-nav a:hover,
.site-nav a.active {
  color: #fff;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: all 0.2s;
}

/* 7. Site Footer
   ---------------------------------------- */
.site-footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.7);
  padding: var(--space-lg) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.footer-brand .logo {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  line-height: 1.5;
}

.site-footer h4 {
  color: #fff;
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover { color: #fff; }

.footer-cta p {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  font-size: 0.85rem;
}
.footer-bottom p { color: rgba(255,255,255,0.4); }

/* 8. Components
   ---------------------------------------- */

/* Cards */
.card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  color: var(--color-accent);
  background: rgba(74, 108, 247, 0.08);
}
.card-icon svg {
  width: 24px;
  height: 24px;
}

.card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.card p {
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}
.card-link:hover { color: inherit; }
.card-link .card:hover {
  transform: translateY(-2px);
}

/* Industry cards */
.card-construction {
  border-top: 3px solid var(--color-construction);
}
.card-construction .card-icon {
  background: var(--color-construction-bg);
  color: var(--color-construction);
}

.card-legal {
  border-top: 3px solid var(--color-legal);
}
.card-legal .card-icon {
  background: var(--color-legal-bg);
  color: var(--color-legal);
}

/* Tags */
.tag {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

.tag-construction {
  background: var(--color-construction-bg);
  color: #b45309;
}

.tag-legal {
  background: var(--color-legal-bg);
  color: #6d28d9;
}

.tag-tech {
  background: rgba(74, 108, 247, 0.08);
  color: var(--color-accent);
}

/* Process steps */
.process-step {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: var(--space-md);
}

.process-step h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.process-step p {
  font-size: 0.95rem;
}

/* Avatar */
.avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

/* 9. Hero Section
   ---------------------------------------- */
.hero {
  padding: var(--space-2xl) 0;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.hero p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  line-height: 1.6;
}

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

.hero-sm {
  padding: var(--space-lg) 0 var(--space-md);
}
.hero-sm h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

/* 10. Case Study Cards
   ---------------------------------------- */
.case-study-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.case-study-card .tag {
  margin-bottom: var(--space-md);
}

.case-study-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.case-study-meta {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.case-study-section {
  margin-bottom: var(--space-lg);
}

.case-study-section h4 {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.case-study-section p {
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}
.case-study-section p:last-child {
  margin-bottom: 0;
}

.case-study-section ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}
.case-study-section ul:last-child {
  margin-bottom: 0;
}

.case-study-section li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.7;
}
.case-study-section li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.case-study-highlight {
  background: var(--color-bg-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.case-study-highlight .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.stat-item .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: var(--space-xs);
}
.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.case-study-body {
  display: grid;
  gap: var(--space-lg);
}

.case-study-body h4 {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.case-study-body p {
  font-size: 0.95rem;
  line-height: 1.7;
}

.case-study-results ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.case-study-results li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  padding-left: 1.5rem;
  position: relative;
}
.case-study-results li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.case-study-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-lg) 0;
}

.case-study-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: var(--space-lg);
  transition: color 0.2s;
}
.case-study-back:hover { color: var(--color-accent); }

.case-study-detail {
  max-width: 820px;
}

.case-study-detail h3 {
  font-size: 1.75rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

/* Case study listing cards */
.cs-listing-card {
  display: block;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.25s, transform 0.25s;
}
.cs-listing-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: inherit;
}
.cs-listing-card .tag { margin-bottom: var(--space-md); }
.cs-listing-card h3 {
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}
.cs-listing-card p {
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}
.cs-listing-card .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}
.cs-listing-card .stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
}
.cs-listing-card .stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.cs-listing-card .read-more {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
}

.case-study-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* 11. About Page
   ---------------------------------------- */
.about-content {
  max-width: 720px;
}

.about-content p {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.founder-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.values-grid {
  display: grid;
  gap: var(--space-lg);
}

.value-item h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.value-item p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 12. Contact Page
   ---------------------------------------- */
.contact-grid {
  display: grid;
  gap: var(--space-xl);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.7rem 0.9rem;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-white);
  color: var(--color-text);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.1);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-info-item h3 {
  margin-bottom: var(--space-xs);
  font-size: 1rem;
  color: var(--color-text);
}

.contact-info-item p {
  font-size: 0.95rem;
}

.contact-info-item a {
  color: var(--color-accent);
}

/* 13. Featured Case Study Cards (homepage)
   ---------------------------------------- */
.featured-card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: box-shadow 0.2s, transform 0.2s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.featured-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: inherit;
}
.featured-card .tag { margin-bottom: var(--space-md); }
.featured-card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  font-size: 1.15rem;
}
.featured-card p {
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}
.featured-card .read-more {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* 14. Claude Partnership Banner
   ---------------------------------------- */
.claude-banner {
  text-align: center;
}
.claude-banner p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}
.section-navy .claude-banner p {
  color: rgba(255,255,255,0.7);
}

/* 15. Responsive — Tablet (min-width: 640px)
   ---------------------------------------- */
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

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

  .contact-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }

  .case-study-highlight .stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* 16. Responsive — Desktop (min-width: 1024px)
   ---------------------------------------- */
@media (min-width: 1024px) {
  .section { padding: var(--space-2xl) 0; }
  .section-alt { padding: var(--space-2xl) 0; }
  .section-navy { padding: var(--space-2xl) 0; }
  .hero { padding: var(--space-3xl) 0; }

  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }

  /* Desktop nav */
  .site-nav {
    display: flex;
    flex-direction: row;
    gap: var(--space-lg);
    position: static;
    background: none;
    padding: 0;
  }
  .site-nav a {
    padding: 0;
    border-bottom: none;
  }

  .nav-toggle { display: none; }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }

  .case-study-body {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* 17. Animations
   ---------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .card, .featured-card, .case-study-card {
    transition: box-shadow 0.25s ease, transform 0.25s ease;
  }
}