/* ============================================================
   TechLabx Design System — style.css
   ============================================================ */

/* ── CSS Variables ── */
:root {
  --bg-body: #f5f7fa;
  --bg-surface: #ffffff;
  --bg-elevated: #f0f2f5;
  --bg-glass: rgba(255,255,255,0.85);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-light: rgba(37,99,235,0.1);
  --accent-grad: linear-gradient(135deg,#2563eb,#06b6d4);
  --border: rgba(0,0,0,0.08);
  --border-subtle: rgba(0,0,0,0.04);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 20px 40px rgba(0,0,0,0.10);
  --transition: 0.3s cubic-bezier(0.16,1,0.3,1);
}

[data-theme='dark'] {
  --bg-body: #080e1a;
  --bg-surface: #0f1825;
  --bg-elevated: #1a2235;
  --bg-glass: rgba(15,24,37,0.85);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #475569;
  --accent: #38bdf8;
  --accent-light: rgba(56,189,248,0.12);
  --accent-grad: linear-gradient(135deg,#2563eb,#38bdf8);
  --border: rgba(255,255,255,0.08);
  --border-subtle: rgba(255,255,255,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 20px 40px rgba(0,0,0,0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

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

/* ── Container ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  z-index: 1000;
  box-shadow: var(--shadow-md);
  white-space: nowrap;
}

.nav-brand {
  font-weight: 800;
  font-size: 1.1rem;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}

.nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--accent-light);
}

.nav-link.active {
  color: var(--accent);
  font-weight: 600;
}

.theme-btn {
  background: var(--accent-light);
  color: var(--accent);
  border: none;
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
}

.theme-btn:hover {
  background: var(--accent);
  color: #ffffff;
}

.mobile-menu-btn {
  display: none;
  background: var(--accent-light);
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

/* ── Mobile Drawer ── */
.mobile-drawer {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-body);
  z-index: 999;
  padding: 80px 24px 40px;
  flex-direction: column;
  gap: 8px;
}

.mobile-drawer.open {
  display: flex;
}

.mobile-drawer-link {
  display: block;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition);
}

.mobile-drawer-link:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.mobile-close-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-light) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-grad);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37,99,235,0.4);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: #ffffff;
}

/* ── Sections ── */
.section {
  padding: 100px 0;
}

.section-sm {
  padding: 60px 0;
}

.section-py {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ── Cards ── */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 20px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.tech-visual-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.tech-visual-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

/* ── Grid ── */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 24px;
}

/* ── Stagger Rows ── */
.stagger-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 80px;
  margin-bottom: 100px;
}

.stagger-row.reverse {
  direction: rtl;
}

.stagger-row.reverse > * {
  direction: ltr;
}

.stagger-visual {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.stagger-visual::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-grad);
}

.stagger-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.stagger-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.stagger-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ── Accordion ── */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.accordion-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
  gap: 12px;
  user-select: none;
  transition: background var(--transition);
}

.accordion-header:hover {
  background: var(--accent-light);
}

.accordion-chevron {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--text-muted);
}

.accordion-item.open .accordion-chevron {
  transform: rotate(180deg);
}

.accordion-item.open {
  border-color: var(--accent);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.accordion-item.open .accordion-body {
  max-height: 500px;
}

.accordion-content {
  padding: 0 24px 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.accordion-num {
  color: var(--accent);
  font-weight: 800;
  font-size: 0.85rem;
  margin-right: 12px;
  opacity: 0.7;
}

/* ── Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 700;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ── Form ── */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition);
  outline: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

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

/* ── Provider Chip ── */
.provider-chip {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.provider-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.provider-chip.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  font-weight: 700;
}

/* ── Footer ── */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand-name {
  font-size: 1.2rem;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  display: block;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.social-links {
  display: flex;
  gap: 12px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.social-link:hover {
  background: var(--accent-light);
  color: var(--accent);
}

/* ── Table ── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 14px 16px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

tr:last-child td {
  border-bottom: none;
}

.status-check {
  color: #22c55e;
  font-weight: 600;
}

/* ── Misc ── */
.log-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.85rem;
  min-height: 80px;
  color: var(--text-secondary);
  line-height: 1.6;
}

code {
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: 'Courier New', Courier, monospace;
}

.highlight-box {
  background: var(--accent-light);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 16px 0;
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.7;
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 16px;
}

.feature-title {
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.email-address {
  font-weight: 600;
  color: var(--accent);
}

.social-pill-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  transition: all var(--transition);
  font-size: 0.9rem;
}

.social-pill-link:hover {
  background: var(--accent-light);
  color: var(--accent);
}

/* ── Animations ── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
  .stagger-row {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .stagger-row.reverse {
    direction: ltr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .hero {
    padding: 100px 24px 60px;
  }
  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid > div:first-child {
    grid-column: 1 / -1;
  }
  .stagger-visual {
    padding: 40px 24px;
  }
  .stagger-row {
    gap: 40px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .card {
    padding: 24px;
  }
  .btn-lg {
    padding: 14px 28px;
  }
}