/* ============================================
   Systek Consulting – Design System
   Inspired by Stripe (purple premium, weight 300)
   + Vercel (Geist, shadow-as-border)
   ============================================ */

/* --- Variables --- */
:root {
  --color-bg: #ffffff;
  --color-surface: #fafafa;
  --color-text: #171717;
  --color-text-secondary: #4d4d4d;
  --color-text-muted: #808080;
  --color-accent: #533afd;
  --color-accent-hover: #4434d4;
  --color-accent-light: #b9b9f9;
  --color-accent-soft: #f5f3ff;
  --color-heading: #0d1b2a;
  --color-dark-bg: #0d1b2a;
  --color-dark-surface: #1a2a3f;
  --color-dark-text: #e8edf2;
  --color-dark-muted: #8899b0;
  --color-border: rgba(0,0,0,0.08);
  --color-border-light: #e5edf5;
  --color-success: #15be53;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --shadow-border: 0px 0px 0px 1px rgba(0,0,0,0.08);
  --shadow-card: 0px 0px 0px 1px rgba(0,0,0,0.08), 0px 2px 2px rgba(0,0,0,0.04);
  --shadow-elevated: 0px 0px 0px 1px rgba(0,0,0,0.08), 0px 4px 12px rgba(0,0,0,0.06);
  --shadow-purple: rgba(83,58,253,0.25) 0px 30px 45px -30px, rgba(0,0,0,0.1) 0px 18px 36px -18px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-pill: 9999px;
  --max-width: 1160px;
  --nav-height: 64px;
}

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

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

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

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

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

::selection {
  background: var(--color-accent);
  color: white;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-heading);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.08;
}
h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.5rem);
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}
h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.5rem);
  letter-spacing: -0.02em;
}
p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

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

section {
  padding: 80px 0;
}
section:first-of-type {
  padding-top: calc(var(--nav-height) + 40px);
}

/* --- Navigation --- */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--color-heading);
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo:hover { color: var(--color-accent); }

.nav-logo-accent {
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 450;
  color: var(--color-text);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  transition: all 0.2s;
}
.nav-links a:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}
.nav-links a.cta-btn {
  background: var(--color-accent);
  color: white;
  padding: 8px 18px;
  font-weight: 500;
}
.nav-links a.cta-btn:hover {
  background: var(--color-accent-hover);
  color: white;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* --- Hero --- */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  background: linear-gradient(135deg, var(--color-accent-soft) 0%, #ffffff 50%, #f0fdf4 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(83,58,253,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(21,190,83,0.04) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero h1 {
  margin-bottom: 1.25rem;
}
.hero h1 .highlight {
  color: var(--color-accent);
}

.hero p {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 580px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-primary {
  background: var(--color-accent);
  color: white;
  box-shadow: var(--shadow-purple);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: white;
  transform: translateY(-1px);
}
.btn-secondary {
  background: transparent;
  color: var(--color-text);
  box-shadow: var(--shadow-border);
}
.btn-secondary:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  box-shadow: inset 0 0 0 1px var(--color-accent-light);
}
.btn-white {
  background: white;
  color: var(--color-accent);
  box-shadow: var(--shadow-card);
}
.btn-white:hover {
  background: var(--color-accent-soft);
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}
.section-header p {
  font-size: 1.1rem;
  line-height: 1.7;
}

/* --- Cards Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all 0.25s;
}
.card:hover {
  box-shadow: var(--shadow-elevated);
  transform: translateY(-2px);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.2rem;
  color: var(--color-accent);
}

.card h3 {
  margin-bottom: 10px;
}
.card p {
  font-size: 0.925rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  margin-bottom: 14px;
}

/* --- About Section --- */
.about-section {
  background: var(--color-surface);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-content h2 {
  margin-bottom: 1rem;
}
.about-content p {
  font-size: 1.05rem;
  line-height: 1.75;
}
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stat-card {
  background: white;
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  text-align: center;
}
.stat-number {
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 450;
}

/* --- CTA Banner --- */
.cta-banner {
  background: var(--color-dark-bg);
  color: white;
  text-align: center;
  padding: 60px 0;
}
.cta-banner h2 {
  color: white;
  margin-bottom: 0.75rem;
}
.cta-banner p {
  color: var(--color-dark-muted);
  max-width: 500px;
  margin: 0 auto 28px;
}
.cta-banner .btn-primary {
  background: white;
  color: var(--color-accent);
  box-shadow: var(--shadow-card);
}
.cta-banner .btn-primary:hover {
  background: var(--color-accent-soft);
}

/* --- Services (Offres) Detail --- */
.service-detail {
  padding: 80px 0;
}
.service-detail:not(:first-of-type) {
  border-top: 1px solid var(--color-border-light);
}
.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
}
.service-info h2 {
  margin-bottom: 0.5rem;
}
.service-info > p {
  margin-bottom: 1.5rem;
}
.service-features {
  list-style: none;
  margin-bottom: 1.5rem;
}
.service-features li {
  padding: 8px 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
}
.service-features li:last-child {
  border-bottom: none;
}
.service-features li::before {
  content: '→';
  color: var(--color-accent);
  font-weight: 600;
  flex-shrink: 0;
}
.service-price {
  background: var(--color-accent-soft);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-accent-light);
}
.service-price .price {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-accent);
}
.service-price .price-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* --- Product Card (WWW v2 etc.) --- */
.product-showcase {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-card);
}
.product-showcase h3 {
  margin-bottom: 0.5rem;
}
.product-tech {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 16px 0;
}
.product-tech span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: white;
  border: 1px solid var(--color-border-light);
  color: var(--color-text-muted);
}

/* --- Contact Form --- */
.contact-section {
  background: var(--color-surface);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}
.contact-info h3 {
  margin-bottom: 0.75rem;
}
.contact-info p {
  margin-bottom: 1.5rem;
}
.contact-detail {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 18px;
}
.contact-detail-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}
.contact-detail-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 2px;
}
.contact-detail-value {
  font-size: 0.95rem;
  color: var(--color-text);
}

.contact-form {
  background: white;
  padding: 36px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background: white;
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(83,58,253,0.1);
}
.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* --- Footer --- */
footer {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
  padding: 48px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.footer-brand .nav-logo {
  color: white;
  margin-bottom: 12px;
}
.footer-brand p {
  color: var(--color-dark-muted);
  font-size: 0.9rem;
  max-width: 280px;
}
.footer-col h4 {
  color: white;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.footer-col ul {
  list-style: none;
}
.footer-col ul li {
  margin-bottom: 8px;
}
.footer-col ul a {
  color: var(--color-dark-muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}
.footer-col ul a:hover {
  color: white;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--color-dark-muted);
}

/* --- Page Hero (inner pages) --- */
.page-hero {
  padding: calc(var(--nav-height) + 60px) 0 40px;
  background: var(--color-accent-soft);
  text-align: center;
}
.page-hero h1 {
  margin-bottom: 0.5rem;
}
.page-hero p {
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto;
}

/* --- Pill Badge --- */
.pill {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}
.pill-accent {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}
.pill-green {
  background: #f0fdf4;
  color: var(--color-success);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .about-grid,
  .service-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .card-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--color-border-light);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    width: 100%;
    padding: 12px 14px;
  }
  .nav-toggle {
    display: flex;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }
}