/* ============================================
   RGP IA PORTFOLIO — STYLES
   Brand color: #4A9B6B (sage green)
   Based on PROMOTION_SITE design system
   ============================================ */

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

:root {
  --green-900: #1a3c2a;
  --green-800: #2d6a4f;
  --green-700: #40916c;
  --green-600: #4A9B6B;
  --green-500: #52b788;
  --green-400: #74c69d;
  --green-300: #95d5b2;
  --green-200: #b7e4c7;
  --green-100: #d8f3dc;
  --green-50: #f0faf4;

  --dark-900: #0a0f0d;
  --dark-800: #111816;
  --dark-700: #1a2420;
  --dark-600: #2a3530;

  --white: #ffffff;
  --gray-50: #f8faf9;
  --gray-100: #eef2f0;
  --gray-200: #dde4e1;
  --gray-300: #c5cec9;
  --gray-400: #9aa7a1;
  --gray-500: #6b7e77;
  --gray-600: #4a5f58;

  --red-500: #dc3545;
  --orange-500: #fd7e14;
  --yellow-500: #ffc107;
  --blue-500: #17a2b8;
  --purple-500: #6f42c1;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-main);
  color: var(--dark-800);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* Typography */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

.gradient-text {
  background: linear-gradient(135deg, var(--green-500), var(--green-300));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-center { text-align: center; }
.mb-3 { margin-bottom: 1rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  font-family: var(--font-main);
}

.btn-primary {
  background: var(--green-600);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--green-700);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 155, 107, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--white);
}

.btn-white {
  background: var(--white);
  color: var(--green-800);
}
.btn-white:hover {
  background: var(--green-50);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: rgba(10, 15, 13, 0.92);
  backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

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

.nav-logo {
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--white);
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--green-400); }

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  font-size: 0.88rem;
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover { color: var(--white); }
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--green-400);
  transition: var(--transition);
}
.nav-links a:hover::after { width: 100%; }

/* Language Selector */
.lang-selector {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: rgba(255,255,255,0.6);
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-main);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}
.lang-btn:hover {
  color: var(--white);
  background: rgba(255,255,255,0.1);
}
.lang-btn.active {
  background: var(--green-600);
  color: var(--white);
}

/* Hero */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(10,15,13,0.95) 0%, rgba(26,60,42,0.85) 50%, rgba(45,106,79,0.75) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 100px;
  padding-bottom: 60px;
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  background: rgba(74,155,107,0.2);
  border: 1px solid rgba(74,155,107,0.4);
  color: var(--green-300);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero h1 {
  color: var(--white);
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero-sub {
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
  margin-bottom: 40px;
  max-width: 700px;
}
.hero-sub strong { color: var(--green-300); }

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

.hero-stat {
  display: flex;
  flex-direction: column;
}

.hero-stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--green-300);
  letter-spacing: -0.5px;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

/* Sections */
.section { padding: 90px 0; }

.section-label {
  display: inline-block;
  background: var(--green-100);
  color: var(--green-800);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-header { margin-bottom: 56px; }
.section-header.center { text-align: center; }

.section-lead {
  font-size: 1.1rem;
  color: var(--gray-500);
  max-width: 700px;
  margin: 16px auto 0;
}
.section-header.center .section-lead { margin-left: auto; margin-right: auto; }

/* Grids */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--green-100), var(--green-200));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green-700);
  font-size: 1.2rem;
  margin-bottom: 18px;
  transition: var(--transition);
}
.card:hover .card-icon {
  background: linear-gradient(135deg, var(--green-600), var(--green-500));
  color: var(--white);
}

.card h3 { margin-bottom: 10px; color: var(--dark-800); }
.card p { color: var(--gray-500); font-size: 0.92rem; line-height: 1.55; }

/* Feature cards (IA features) */
.section-features { background: var(--gray-50); }

/* KPI Section */
.section-kpis { background: var(--white); }

.kpi-table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}

.kpi-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.kpi-table thead { background: var(--dark-800); color: var(--white); }

.kpi-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.kpi-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.9rem;
}

.kpi-table tbody tr:hover { background: var(--green-50); }

.kpi-table .improvement {
  color: var(--green-600);
  font-weight: 700;
}

/* Architecture Section */
.section-arch { background: var(--gray-50); }

.arch-code-block {
  background: var(--dark-800);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 16px 0;
  overflow-x: auto;
}

.arch-code-block pre {
  color: var(--green-200);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.65;
  white-space: pre;
}

.arch-diagram {
  background: var(--dark-800);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 16px 0;
  overflow-x: auto;
}

.arch-diagram pre {
  color: var(--green-300);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  white-space: pre;
}

/* Image Gallery */
.section-images { background: var(--white); }

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.image-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.image-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.image-placeholder {
  height: 160px;
  background: var(--green-50);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green-300);
  font-size: 2.5rem;
  border-bottom: 1px solid var(--gray-200);
  overflow: hidden;
}
.image-placeholder img { width: 100%; height: 100%; object-fit: cover; display: block; }

.image-card-body {
  padding: 16px;
}

.image-card-body h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--dark-800);
  margin-bottom: 6px;
}

.image-card-body .filename {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green-700);
  background: var(--green-100);
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.image-card-body p {
  font-size: 0.83rem;
  color: var(--gray-500);
  line-height: 1.5;
}

.image-card-body .tool {
  font-size: 0.76rem;
  color: var(--gray-400);
  margin-top: 8px;
  font-style: italic;
}

/* CTA */
.cta {
  background: var(--dark-800);
  color: var(--white);
  text-align: center;
  padding: 80px 24px;
}

.cta h2 {
  color: var(--white);
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.cta p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 0;
  font-size: 1rem;
}

/* Footer */
.footer {
  background: var(--dark-900);
  color: var(--gray-400);
  text-align: center;
  padding: 28px 24px;
  font-size: 0.82rem;
}

/* Feature list */
.feature-list {
  list-style: none;
  margin: 16px 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.92rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.feature-list li i {
  color: var(--green-600);
  margin-top: 4px;
  flex-shrink: 0;
}

/* Subsection heading */
.sub-heading {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark-800);
  margin-top: 32px;
}

/* Responsive */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr; }
  .hero-stat-number { font-size: 1.5rem; }
  .hero h1 { font-size: 1.8rem; }
  .section { padding: 60px 0; }
  .image-grid { grid-template-columns: 1fr; }
}