/* CSS Design Tokens & Reset */
:root {
  --bg-primary: #0b0f19;
  --bg-surface: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.35);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-faint: #6b7280;

  --accent-cyan: #38bdf8;
  --accent-blue: #2563eb;
  --accent-indigo: #6366f1;
  --accent-glow: rgba(56, 189, 248, 0.15);

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --container-max: 1160px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(37, 99, 235, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(99, 102, 241, 0.1) 0%, transparent 45%);
  background-attachment: fixed;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

/* Typography Helpers */
h1, h2, h3, h4, h5 {
  color: #fff;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

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

.gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
}

.logo-icon {
  width: 24px;
  height: 24px;
  stroke: var(--accent-cyan);
}

.brand-name .highlight {
  color: var(--accent-cyan);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-list a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-list a:hover {
  color: #fff;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.85rem 1.8rem;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #0b0f19;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

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

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero-section {
  padding-block: clamp(3.5rem, 8vh, 6rem) clamp(2.5rem, 6vh, 4.5rem);
}

.hero-content {
  text-align: center;
  max-width: 860px;
}

.badge {
  display: inline-flex;
  padding: 0.35rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.2rem, 1.2rem + 4vw, 3.8rem);
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.hero-lead {
  font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.25rem);
  color: var(--text-muted);
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: 2.25rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Section Common */
.section {
  padding-block: clamp(3.5rem, 7vh, 5.5rem);
}

.section-header {
  margin-bottom: 3rem;
}

.section-title {
  font-size: clamp(1.8rem, 1.2rem + 2vw, 2.5rem);
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 640px;
  margin-inline: auto;
}

/* Services Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.75rem;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  margin-bottom: 1.25rem;
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.service-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

.service-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feature-list li::before {
  content: "— ";
  color: var(--accent-cyan);
}

/* Timeline / Methodology */
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  position: relative;
}

.step-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: rgba(56, 189, 248, 0.25);
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.step-card h4 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

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

/* Case Studies */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.25rem;
}

.case-tag {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.8rem;
}

.case-card h3 {
  font-size: 1.4rem;
  margin-bottom: 0.6rem;
}

.case-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.case-metrics {
  display: flex;
  gap: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

.case-metrics div {
  display: flex;
  flex-direction: column;
}

.case-metrics strong {
  font-size: 1.35rem;
  color: #fff;
}

.case-metrics span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* FAQ Accordion (Details & Summary) */
.faq-container {
  max-width: 760px;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

details {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

details[open] {
  border-color: var(--border-hover);
}

summary {
  padding: 1.2rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-size: 1.35rem;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Contact Form */
.contact-container {
  max-width: 680px;
}

.contact-header {
  margin-bottom: 2rem;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: #0f172a;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.form-success {
  margin-top: 1.5rem;
  padding: 1.75rem;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: var(--radius-md);
  text-align: center;
}

.success-icon {
  width: 38px;
  height: 38px;
  stroke: #22c55e;
  margin-bottom: 0.75rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: #070a11;
  padding-top: 4rem;
  margin-top: 3rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.footer-col h5 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-col a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--accent-cyan);
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-block: 0.6rem 0.8rem;
}

.location-text {
  font-size: 0.825rem;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.icon-inline {
  width: 14px;
  height: 14px;
  stroke: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-block: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-faint);
  text-align: center;
}