/* ============================================================
   Smart IT Solution — Modern Design System
   ============================================================ */

/* --- Design Tokens --- */
:root {
  /* Surfaces — layered depth */
  --color-bg: #07111F;
  --color-surface-1: #0B1A2E;
  --color-surface-2: #0F2240;
  --color-surface-3: #142C4E;

  /* Accent */
  --color-accent-blue: #2479D0;
  --color-accent-blue-light: #3D8FE6;
  --color-accent-teal: #4DBDCC;
  --color-accent-teal-light: #72D1DD;

  /* Gradients */
  --gradient-brand: linear-gradient(135deg, #2479D0, #4DBDCC);
  --gradient-brand-hover: linear-gradient(135deg, #3D8FE6, #72D1DD);
  --gradient-surface: linear-gradient(180deg, var(--color-surface-1) 0%, var(--color-bg) 100%);
  --gradient-glow-blue: radial-gradient(circle, rgba(36, 121, 208, 0.12) 0%, transparent 70%);
  --gradient-glow-teal: radial-gradient(circle, rgba(77, 189, 204, 0.08) 0%, transparent 70%);

  /* Text */
  --color-text-primary: #F0F4F8;
  --color-text-secondary: #B8CDE0;
  --color-text-tertiary: #7A9BBF;

  /* Border */
  --color-border: #1A3A6A;
  --color-border-subtle: #132A4A;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.35);
  --shadow-glow-blue: 0 0 48px rgba(36, 121, 208, 0.12);
  --shadow-glow-teal: 0 0 48px rgba(77, 189, 204, 0.08);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.15s var(--ease-out);
  --transition-normal: 0.3s var(--ease-out);
  --transition-slow: 0.5s var(--ease-out);

  /* Spacing */
  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

a {
  color: var(--color-accent-teal);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent-teal-light); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent-blue);
  outline-offset: 2px;
}

::selection {
  background: rgba(36, 121, 208, 0.3);
  color: var(--color-text-primary);
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.section { padding: 96px 0; }

/* Label / eyebrow */
.label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 12px;
  color: var(--color-accent-teal);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 1px;
}

/* Section headline */
.section-headline {
  font-weight: 700;
  font-size: clamp(28px, 4vw, 36px);
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-sub {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: 48px;
  line-height: 1.7;
}

.divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border) 30%, var(--color-border) 70%, transparent);
}

/* Gradient text */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(32px, 5vw, 44px); }
h2 { font-size: clamp(26px, 4vw, 36px); }
h3 { font-size: clamp(20px, 3vw, 24px); }
h4 { font-size: 18px; }

.stat-number {
  font-weight: 800;
  font-size: clamp(44px, 6vw, 60px);
  line-height: 1;
  letter-spacing: -0.03em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-weight: 600;
  font-size: 11px;
  color: var(--color-text-tertiary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 10px;
  line-height: 1.4;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 15px;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  text-align: center;
  letter-spacing: 0.01em;
  position: relative;
}

.btn-primary {
  background: var(--gradient-brand);
  color: var(--color-text-primary);
  border: none;
  box-shadow: 0 4px 20px rgba(36, 121, 208, 0.3);
}
.btn-primary:hover {
  background: var(--gradient-brand-hover);
  color: var(--color-text-primary);
  box-shadow: 0 8px 32px rgba(36, 121, 208, 0.4);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-accent-teal);
  color: var(--color-accent-teal);
  background: rgba(77, 189, 204, 0.06);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(7, 17, 31, 0.6);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border-bottom: 1px solid rgba(26, 58, 106, 0.3);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(7, 17, 31, 0.92);
  border-bottom-color: rgba(26, 58, 106, 0.6);
}

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

.nav-logo {
  font-weight: 700;
  font-size: 17px;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.01em;
}
.nav-logo:hover { color: var(--color-text-primary); }
.nav-logo svg { width: 32px; height: 32px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-tertiary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-links a:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.04);
}
.nav-links a.active {
  color: var(--color-text-primary);
  background: rgba(36, 121, 208, 0.12);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

/* Mobile overlay nav */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 17, 31, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 14px 32px;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.mobile-nav a:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.04);
}
.mobile-nav-close {
  position: absolute;
  top: 20px; right: 24px;
  padding: 8px;
}
.mobile-nav-close svg {
  width: 24px; height: 24px;
  stroke: var(--color-text-secondary);
}

/* --- Hero --- */
.hero {
  padding-top: calc(var(--nav-height) + 100px);
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

/* Grid dots */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(26, 58, 106, 0.2) 1px, transparent 0);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 30% 40%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 30% 40%, black 0%, transparent 80%);
  pointer-events: none;
}

/* Blue glow orb */
.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(80px);
  opacity: 0.5;
}
.hero-glow--blue {
  top: -20%;
  right: -10%;
  background: rgba(36, 121, 208, 0.15);
}
.hero-glow--teal {
  bottom: -30%;
  left: -15%;
  background: rgba(77, 189, 204, 0.08);
}

.hero-content {
  position: relative;
  max-width: 720px;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(36px, 5.5vw, 56px);
  margin-bottom: 24px;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero .hero-sub {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--color-text-secondary);
  margin-bottom: 14px;
  line-height: 1.6;
}

.hero .hero-supporting {
  font-size: 15px;
  color: var(--color-text-tertiary);
  margin-bottom: 40px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-accent-line {
  height: 1px;
  background: linear-gradient(90deg, var(--color-accent-teal), var(--color-accent-blue) 40%, transparent);
  margin-top: 80px;
  opacity: 0.6;
}

/* --- Stats Bar --- */
.stats-bar {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.stats-bar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-brand);
}

.stats-bar .stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.stats-bar .stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -12px;
  top: 15%; height: 70%;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--color-border), transparent);
}

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

.card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: all var(--transition-normal);
  position: relative;
}
.card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, transparent 40%, rgba(36, 121, 208, 0.3), rgba(77, 189, 204, 0.2));
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-blue);
  background: var(--color-surface-3);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  color: var(--color-accent-teal);
  background: linear-gradient(135deg, rgba(77, 189, 204, 0.1), rgba(36, 121, 208, 0.08));
  border-radius: var(--radius-md);
  padding: 10px;
  border: 1px solid rgba(77, 189, 204, 0.15);
}

.card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}
.card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.card-link {
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent-teal);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition-fast), color var(--transition-fast);
}
.card-link:hover {
  color: var(--color-accent-teal-light);
  gap: 10px;
}

/* --- Feature Strip --- */
.feature-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  padding: 32px 28px;
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
.feature-item::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-brand);
  border-radius: 3px 3px 0 0;
}
.feature-item h4 {
  font-size: 17px;
  margin-bottom: 10px;
}
.feature-item p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Client Segments --- */
.segments-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.segment-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  transition: all var(--transition-normal);
}
.segment-item:hover {
  border-color: rgba(77, 189, 204, 0.3);
  background: var(--color-surface-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), var(--shadow-glow-teal);
}

.segment-icon {
  width: 36px; height: 36px;
  color: var(--color-accent-teal);
  flex-shrink: 0;
}

/* --- CTA Banner --- */
.cta-banner {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -60%; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 500px;
  background: radial-gradient(ellipse, rgba(36, 121, 208, 0.1) 0%, rgba(77, 189, 204, 0.04) 40%, transparent 70%);
  pointer-events: none;
}
.cta-banner::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  padding: 1px;
  background: linear-gradient(135deg, rgba(36, 121, 208, 0.2), transparent 40%, transparent 60%, rgba(77, 189, 204, 0.15));
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
  pointer-events: none;
}
.cta-banner h2 {
  font-size: clamp(22px, 3vw, 30px);
  margin-bottom: 28px;
  position: relative;
}
.cta-banner .btn { position: relative; }

/* --- Page Header (inner pages) --- */
.page-header {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 48px;
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(26, 58, 106, 0.15) 1px, transparent 0);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, black, transparent);
  -webkit-mask-image: linear-gradient(180deg, black, transparent);
  pointer-events: none;
}
.page-header .container { position: relative; z-index: 1; }
.page-header h1 { margin-bottom: 16px; }
.page-header p {
  max-width: 640px;
  color: var(--color-text-secondary);
}

/* --- Callout Card --- */
.callout {
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-left: 3px solid var(--color-accent-blue);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin: 32px 0;
}
.callout p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* --- Platform Grid --- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}

.platform-card {
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition-normal);
}
.platform-card:hover {
  border-color: rgba(77, 189, 204, 0.25);
  background: var(--color-surface-2);
  transform: translateY(-2px);
}
.platform-card h4 {
  font-size: 16px;
  margin-bottom: 8px;
}
.platform-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Framework Card --- */
.framework-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}
.framework-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-brand);
}
.framework-card h3 {
  font-size: 24px;
  margin-bottom: 8px;
}
.framework-card .framework-subtitle {
  font-size: 12px;
  color: var(--color-accent-teal);
  margin-bottom: 24px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.framework-letters {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}
.framework-letter {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
}
.framework-letter .letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  background: var(--gradient-brand);
  color: var(--color-text-primary);
  font-weight: 700;
  font-size: 16px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.framework-letter .word {
  color: var(--color-text-primary);
  font-weight: 500;
}
.framework-card .framework-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 20px;
}

/* --- Timeline (3-phase) --- */
.timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 10%; right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-teal));
  opacity: 0.4;
}

.timeline-step {
  text-align: center;
  position: relative;
}
.timeline-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px; height: 60px;
  background: var(--gradient-brand);
  color: var(--color-text-primary);
  font-weight: 700;
  font-size: 24px;
  border-radius: 50%;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 20px rgba(36, 121, 208, 0.3);
}
.timeline-step h3 {
  font-size: 20px;
  margin-bottom: 10px;
}
.timeline-step p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Deliverables List --- */
.deliverables {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 8px;
}
.deliverable-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--color-text-secondary);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}
.deliverable-item:hover {
  background: rgba(15, 34, 64, 0.4);
}
.deliverable-item svg {
  width: 20px; height: 20px;
  color: var(--color-accent-teal);
  flex-shrink: 0;
  margin-top: 2px;
}

/* --- Profile Card --- */
.profile-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px;
  display: flex;
  gap: 36px;
  align-items: flex-start;
}
.profile-avatar {
  width: 100px; height: 100px;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-surface-1);
  border: 2px solid transparent;
  background-clip: padding-box;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 0 0 2px var(--color-accent-blue);
}
.profile-avatar svg { width: 64px; height: 64px; }
.profile-info h3 { font-size: 24px; margin-bottom: 4px; }
.profile-info .profile-role {
  font-size: 12px;
  color: var(--color-accent-teal);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}
.profile-info p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 10px;
}
.profile-info strong { color: var(--color-text-primary); }

/* --- Tabs --- */
.tab-nav {
  display: flex;
  gap: 4px;
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 36px;
  overflow-x: auto;
  width: fit-content;
}
.tab-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-tertiary);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: none;
  background: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}
.tab-btn:hover { color: var(--color-text-primary); }
.tab-btn.active {
  color: var(--color-text-primary);
  background: var(--color-surface-2);
  box-shadow: var(--shadow-sm);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }
.tab-panel h3 { font-size: 24px; margin-bottom: 14px; }
.tab-panel p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 14px;
}

/* --- Contact Form --- */
.contact-form { max-width: 640px; }
.form-group { margin-bottom: 24px; }
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 13px;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text-primary);
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(36, 121, 208, 0.15);
  outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--color-text-tertiary); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237A9BBF' fill='none' stroke-width='2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 18px center;
  padding-right: 44px;
}
.form-group select option { background: var(--color-surface-2); color: var(--color-text-primary); }

.checkbox-group { display: flex; flex-wrap: wrap; gap: 20px; }
.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
  font-size: 15px;
  text-transform: none;
  letter-spacing: 0;
  cursor: pointer;
  color: var(--color-text-secondary);
}
.checkbox-group input[type="checkbox"] {
  width: 18px; height: 18px;
  accent-color: var(--color-accent-blue);
}

/* --- Regions --- */
.regions { display: flex; flex-wrap: wrap; gap: 10px; }
.region-tag {
  background: var(--color-surface-1);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  padding: 8px 22px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}
.region-tag:hover {
  border-color: rgba(77, 189, 204, 0.3);
  background: rgba(77, 189, 204, 0.06);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  padding: 64px 0 32px;
  margin-top: 96px;
  background: var(--color-surface-1);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 56px;
  margin-bottom: 48px;
}
.footer-brand h3 { font-size: 18px; margin-bottom: 10px; }
.footer-brand .footer-tagline {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}
.footer-brand .footer-url { font-size: 13px; color: var(--color-accent-teal); }
.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--color-text-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-tertiary);
}

/* --- Scroll Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  will-change: opacity, transform;
  backface-visibility: hidden;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0) translateZ(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .feature-strip { grid-template-columns: 1fr; gap: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .stats-bar .stat-item:not(:last-child)::after { display: none; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .section { padding: 64px 0; }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px; padding: 32px 24px;
  }
  .card-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; gap: 36px; }
  .timeline::before { display: none; }
  .profile-card { flex-direction: column; align-items: center; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .cta-banner { padding: 44px 28px; }
  .segments-row { gap: 12px; }
  .segment-item { padding: 12px 18px; font-size: 13px; }
  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { width: 100%; }
  .tab-nav { width: 100%; gap: 0; }
  .tab-btn { padding: 10px 14px; font-size: 13px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
  .framework-letters { flex-direction: column; }
}

/* --- Print --- */
@media print {
  body { font-size: 10px; background: #fff; color: #222; }
  .navbar, .mobile-nav, .cta-banner, .hero-glow { display: none; }
  .card, .callout, .framework-card, .platform-card { border: 1px solid #ccc; background: #f9f9f9; }
  h1, h2, h3, h4 { color: #111; }
  .stat-number { -webkit-text-fill-color: #2479D0; color: #2479D0; }
}