/* Sierra Data Labs Brand Website Styles
 * Built on Foundation CSS framework
 * Design: "Data Precision" — deep slate + teal accent + amber highlight
 */

/* ============================================
   CSS Custom Properties (Brand Colors)
   ============================================ */
:root {
  /* Primary Palette */
  --sdl-slate: #1E293B;
  --sdl-slate-light: #475569;
  --sdl-alpine: #0F766E;
  --sdl-alpine-light: #14B8A6;
  --sdl-alpine-dark: #0D5F59;
  --sdl-summit: #F59E0B;
  --sdl-summit-light: #FBBF24;
  --sdl-snow: #FAFBFC;
  --sdl-white: #FFFFFF;

  /* Grays */
  --sdl-gray-100: #F1F5F9;
  --sdl-gray-200: #E2E8F0;
  --sdl-gray-300: #CBD5E1;
  --sdl-gray-400: #94A3B8;
  --sdl-gray-500: #64748B;
  --sdl-gray-600: #475569;

  /* Semantic */
  --sdl-success: #10B981;
  --sdl-error: #EF4444;

  /* Typography */
  --sdl-font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display',
                    'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --sdl-font-mono: 'SF Mono', Monaco, 'Courier New', monospace;

  /* Spacing */
  --sdl-section-padding: 6rem 0;
  --sdl-section-padding-mobile: 4rem 0;

  /* Border Radius */
  --sdl-radius-sm: 6px;
  --sdl-radius-md: 12px;
  --sdl-radius-lg: 20px;
  --sdl-radius-full: 9999px;

  /* Shadows */
  --sdl-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --sdl-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
  --sdl-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --sdl-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --sdl-shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);

  /* Transitions */
  --sdl-transition-fast: 150ms ease;
  --sdl-transition-base: 250ms ease;
  --sdl-transition-slow: 400ms ease;

  /* Semantic Color Variables (Theme-Aware) — default to light mode */
  --sdl-bg-primary: var(--sdl-white);
  --sdl-bg-secondary: var(--sdl-snow);
  --sdl-bg-tertiary: var(--sdl-gray-100);
  --sdl-surface: var(--sdl-white);
  --sdl-text-primary: var(--sdl-slate);
  --sdl-text-secondary: var(--sdl-slate-light);
  --sdl-text-muted: var(--sdl-gray-500);
  --sdl-border: var(--sdl-gray-200);
  --sdl-border-subtle: var(--sdl-gray-300);
}

/* ============================================
   Dark Mode
   ============================================ */
[data-theme="dark"] {
  --sdl-bg-primary: #0F172A;
  --sdl-bg-secondary: #1E293B;
  --sdl-bg-tertiary: #162032;
  --sdl-surface: #1E293B;
  --sdl-text-primary: #F1F5F9;
  --sdl-text-secondary: #94A3B8;
  --sdl-text-muted: #64748B;
  --sdl-border: #334155;
  --sdl-border-subtle: #1E293B;
  --sdl-alpine: #2DD4BF;
  --sdl-alpine-light: #5EEAD4;
  --sdl-alpine-dark: #14B8A6;
  --sdl-summit: #FBBF24;
  --sdl-summit-light: #FCD34D;
  --sdl-slate: #F1F5F9;
  --sdl-slate-light: #94A3B8;
  --sdl-gray-100: #1E293B;
  --sdl-gray-200: #334155;
  --sdl-gray-300: #334155;
  --sdl-gray-400: #64748B;
  --sdl-gray-500: #94A3B8;
  --sdl-gray-600: #CBD5E1;
  --sdl-white: #0F172A;
  --sdl-snow: #1E293B;
}

/* System preference fallback (no JS or no preference stored) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sdl-bg-primary: #0F172A;
    --sdl-bg-secondary: #1E293B;
    --sdl-bg-tertiary: #162032;
    --sdl-surface: #1E293B;
    --sdl-text-primary: #F1F5F9;
    --sdl-text-secondary: #94A3B8;
    --sdl-text-muted: #64748B;
    --sdl-border: #334155;
    --sdl-border-subtle: #1E293B;
    --sdl-alpine: #2DD4BF;
    --sdl-alpine-light: #5EEAD4;
    --sdl-alpine-dark: #14B8A6;
    --sdl-summit: #FBBF24;
    --sdl-summit-light: #FCD34D;
    --sdl-slate: #F1F5F9;
    --sdl-slate-light: #94A3B8;
    --sdl-gray-100: #1E293B;
    --sdl-gray-200: #334155;
    --sdl-gray-300: #334155;
    --sdl-gray-400: #64748B;
    --sdl-gray-500: #94A3B8;
    --sdl-gray-600: #CBD5E1;
    --sdl-white: #0F172A;
    --sdl-snow: #1E293B;
  }
}

/* ============================================
   Base & Reset
   ============================================ */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sdl-font-family);
  color: var(--sdl-text-primary);
  background-color: var(--sdl-bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--sdl-text-primary);
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  color: var(--sdl-text-secondary);
  margin-bottom: 1rem;
}

.lead {
  font-size: 1.25rem;
  color: var(--sdl-text-muted);
  line-height: 1.7;
}

@media screen and (max-width: 639px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.25rem; }
  .lead { font-size: 1.1rem; }
}

/* ============================================
   Links
   ============================================ */
a {
  color: var(--sdl-alpine);
  transition: color var(--sdl-transition-fast);
}

a:hover {
  color: var(--sdl-alpine-dark);
}

/* ============================================
   Buttons
   ============================================ */
.button, button {
  font-family: var(--sdl-font-family);
  font-weight: 600;
  border-radius: var(--sdl-radius-md);
  transition: all var(--sdl-transition-fast);
}

.button.primary {
  background-color: var(--sdl-alpine);
  color: #FFFFFF;
}

.button.primary:hover,
.button.primary:focus {
  background-color: var(--sdl-alpine-dark);
  box-shadow: 0 4px 15px rgba(15, 118, 110, 0.4);
}

.button.secondary {
  background-color: var(--sdl-summit);
  color: #1E293B;
}

.button.secondary:hover,
.button.secondary:focus {
  background-color: #D97706;
}

.button.outline {
  background-color: transparent;
  border: 2px solid var(--sdl-alpine);
  color: var(--sdl-alpine);
}

.button.outline:hover,
.button.outline:focus {
  background-color: var(--sdl-alpine);
  color: #FFFFFF;
}

.button.large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* ============================================
   Header / Navigation
   ============================================ */
.site-header {
  background-color: var(--sdl-bg-primary);
  border-bottom: 1px solid var(--sdl-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .grid-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.site-logo img {
  width: 36px;
  height: 36px;
}

.site-logo span {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--sdl-text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
}

.nav-links a {
  color: var(--sdl-text-secondary);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--sdl-transition-fast);
}

.nav-links a:hover {
  color: var(--sdl-alpine);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--sdl-text-primary);
  margin: 5px 0;
  transition: var(--sdl-transition-fast);
}

@media screen and (max-width: 639px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--sdl-bg-primary);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--sdl-border);
    gap: 1rem;
  }

  .nav-links.is-active {
    display: flex;
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: 5rem 0 6rem;
  background: linear-gradient(180deg, var(--sdl-bg-primary) 0%, var(--sdl-bg-tertiary) 100%);
  overflow: hidden;
}

.hero-content {
  max-width: 640px;
}

.hero h1 {
  margin-bottom: 0.5rem;
}

.hero .lead {
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

/* Accent gradient text for hero headline */
.text-gradient {
  background: linear-gradient(135deg, var(--sdl-alpine) 0%, var(--sdl-summit) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media screen and (max-width: 1023px) {
  .hero {
    text-align: center;
    padding: 3rem 0 4rem;
  }

  .hero-content {
    max-width: 100%;
    margin-bottom: 2rem;
  }

  .hero-cta {
    justify-content: center;
  }
}

/* ============================================
   Sections (Generic)
   ============================================ */
.section {
  padding: var(--sdl-section-padding);
}

.section-alt {
  background-color: var(--sdl-bg-tertiary);
}

.section-dark {
  background-color: #1E293B;
  color: #F1F5F9;
}

[data-theme="dark"] .section-dark {
  background-color: #0B1120;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .section-dark {
    background-color: #0B1120;
  }
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: #F1F5F9;
}

.section-dark p {
  color: #94A3B8;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

@media screen and (max-width: 639px) {
  .section {
    padding: var(--sdl-section-padding-mobile);
  }

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

/* ============================================
   Card Grid (Products + Services)
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

@media screen and (max-width: 1023px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media screen and (max-width: 639px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

.sdl-card {
  background-color: var(--sdl-surface);
  border: 1px solid var(--sdl-border);
  border-radius: var(--sdl-radius-md);
  padding: 2rem;
  transition: box-shadow var(--sdl-transition-base), transform var(--sdl-transition-base);
}

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

.sdl-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.sdl-card p {
  font-size: 0.95rem;
  color: var(--sdl-text-secondary);
  margin-bottom: 0;
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--sdl-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.5rem;
}

.card-icon.icon-alpine {
  background: linear-gradient(135deg, var(--sdl-alpine-light), var(--sdl-alpine));
  color: #FFFFFF;
}

.card-icon.icon-summit {
  background: linear-gradient(135deg, var(--sdl-summit-light), var(--sdl-summit));
  color: #1E293B;
}

.card-icon.icon-slate {
  background: linear-gradient(135deg, var(--sdl-gray-400), var(--sdl-gray-600));
  color: #FFFFFF;
}

/* Featured product card (larger, with accent border) */
.sdl-card.featured {
  border-left: 4px solid var(--sdl-alpine);
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: center;
}

.sdl-card.featured .card-icon {
  width: 72px;
  height: 72px;
  font-size: 2rem;
  margin-bottom: 0;
}

@media screen and (max-width: 639px) {
  .sdl-card.featured {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .sdl-card.featured .card-icon {
    margin: 0 auto;
  }
}

.sdl-card .card-link {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--sdl-alpine);
}

.sdl-card .card-link:hover {
  text-decoration: underline;
}

/* Future product placeholder */
.sdl-card.placeholder {
  border-style: dashed;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  opacity: 0.7;
}

.sdl-card.placeholder:hover {
  opacity: 1;
}

/* ============================================
   About Section
   ============================================ */
.about-content {
  max-width: 720px;
  margin: 0 auto;
}

.about-content p {
  font-size: 1.1rem;
  line-height: 1.8;
}

.philosophy-callout {
  background-color: var(--sdl-surface);
  border: 1px solid var(--sdl-border);
  border-left: 4px solid var(--sdl-summit);
  border-radius: var(--sdl-radius-md);
  padding: 2rem;
  margin-top: 2.5rem;
}

.philosophy-callout p {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--sdl-text-secondary);
  margin-bottom: 0;
}

.philosophy-callout strong {
  color: var(--sdl-text-primary);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-section {
  text-align: center;
  background: linear-gradient(180deg, var(--sdl-bg-tertiary) 0%, var(--sdl-bg-primary) 100%);
}

.contact-section .lead {
  margin-bottom: 2rem;
}

.contact-email {
  font-size: 1.25rem;
  font-weight: 600;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background-color: #1E293B;
  color: #94A3B8;
  padding: 3rem 0 2rem;
}

[data-theme="dark"] .site-footer {
  background-color: #0B1120;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-footer {
    background-color: #0B1120;
  }
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.footer-brand img {
  width: 36px;
  height: 36px;
  border-radius: var(--sdl-radius-sm);
}

.footer-brand span {
  font-size: 1.125rem;
  font-weight: 600;
  color: #F1F5F9;
}

.footer-tagline {
  font-size: 0.9rem;
  color: #64748B;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: #94A3B8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--sdl-transition-fast);
}

.footer-links a:hover {
  color: #F1F5F9;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.875rem;
}

.footer-bottom p {
  color: #64748B;
}

@media screen and (max-width: 639px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-brand {
    justify-content: center;
  }

  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }
}

/* ============================================
   Theme Toggle Button
   ============================================ */
.theme-toggle {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--sdl-text-secondary);
  border-radius: var(--sdl-radius-sm);
  transition: color var(--sdl-transition-fast);
  display: flex;
  align-items: center;
  margin-left: 0.5rem;
}

.theme-toggle:hover {
  color: var(--sdl-text-primary);
}

.theme-icon {
  width: 20px;
  height: 20px;
}

.theme-icon.hidden {
  display: none;
}

/* ============================================
   Cookie Consent Banner
   ============================================ */
#cookie-consent-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #1E293B;
  color: #F1F5F9;
  padding: 1rem;
  z-index: 9999;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
  animation: slideUp 0.3s ease-out;
}

#cookie-consent-banner.hiding {
  animation: slideDown 0.3s ease-out forwards;
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideDown {
  from { transform: translateY(0); opacity: 1; }
  to { transform: translateY(100%); opacity: 0; }
}

.cookie-consent-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cookie-consent-content p {
  margin: 0;
  flex: 1;
  min-width: 200px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #CBD5E1;
}

.cookie-consent-content a {
  color: var(--sdl-alpine-light);
  text-decoration: underline;
}

.cookie-consent-content a:hover {
  color: #F1F5F9;
}

.cookie-consent-buttons {
  display: flex;
  gap: 0.75rem;
  flex-shrink: 0;
}

.cookie-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--sdl-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--sdl-transition-fast);
}

.cookie-btn-primary {
  background: var(--sdl-alpine);
  color: #FFFFFF;
}

.cookie-btn-primary:hover {
  background: var(--sdl-alpine-light);
}

.cookie-btn-secondary {
  background: transparent;
  color: #94A3B8;
  border: 1px solid #475569;
}

.cookie-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #F1F5F9;
}

@media (max-width: 600px) {
  .cookie-consent-content {
    flex-direction: column;
    text-align: center;
  }

  .cookie-consent-buttons {
    width: 100%;
    justify-content: center;
  }
}

/* ============================================
   Scroll Reveal Animations
   ============================================ */
.sdl-reveal-ready .sdl-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.sdl-reveal-ready .sdl-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal:nth-child(1) { transition-delay: 0ms; }
.sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal:nth-child(2) { transition-delay: 100ms; }
.sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal:nth-child(3) { transition-delay: 200ms; }
.sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal:nth-child(4) { transition-delay: 300ms; }
.sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal:nth-child(5) { transition-delay: 400ms; }
.sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal:nth-child(6) { transition-delay: 500ms; }

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .sdl-reveal-ready .sdl-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .sdl-reveal-ready .sdl-reveal-stagger > .sdl-reveal {
    transition-delay: 0ms !important;
  }
  * {
    animation-duration: 0.01ms !important;
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.text-alpine { color: var(--sdl-alpine); }
.text-summit { color: var(--sdl-summit); }
.text-muted { color: var(--sdl-text-muted); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

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

/* ============================================
   Legal Pages (Privacy, Terms)
   ============================================ */
.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 1rem;
}

.legal-content h1 {
  margin-bottom: 0.5rem;
}

.legal-content .last-updated {
  color: var(--sdl-gray-500);
  margin-bottom: 3rem;
}

.legal-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.legal-content p,
.legal-content li {
  color: var(--sdl-text-secondary);
  line-height: 1.7;
}

.legal-content ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.legal-content li {
  margin-bottom: 0.5rem;
}

.legal-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.legal-content th {
  background: var(--sdl-gray-100);
  border-bottom: 2px solid var(--sdl-gray-300);
  padding: 0.75rem;
  text-align: left;
  color: var(--sdl-text-primary);
}

.legal-content td {
  border-bottom: 1px solid var(--sdl-gray-200);
  padding: 0.75rem;
  color: var(--sdl-text-secondary);
}