/* ============================================
   Svalin — AI Governance Platform
   Design Tokens & Styles
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Brand */
  --svalin-navy: #0D1B2A;
  --svalin-amber: #E8A830;
  --svalin-ice: #F0F4F8;
  --svalin-muted: #6B7A8D;
  --svalin-border: #E2E8F0;
  --svalin-surface: #FFFFFF;

  /* Environment (web platform — glacial blue) */
  --env-accent: #4A90B8;
  --env-accent-subtle: #EBF4FF;
  --env-bg: #F5F7FA;

  /* Semantic */
  --color-success: #15803d;
  --color-success-bg: #d1fae5;
  --color-warning: #92400e;
  --color-warning-bg: #fffbeb;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;

  /* Typography */
  --font-sans: 'Urbanist', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', ui-monospace, monospace;

  --text-meta: 0.6875rem;
  --text-ui: 0.8125rem;
  --text-body: 0.875rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-h2: 1.5rem;
  --text-h1: 2rem;
  --text-display: 2.5rem;
  --text-hero: 3.25rem;

  --tracking-wordmark: 0.2em;
  --tracking-overline: 0.1em;
  --tracking-label: 0.01em;
  --tracking-display: -0.02em;
  --tracking-h1: -0.01em;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Radius */
  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(13, 27, 42, 0.05);
  --shadow: 0 1px 3px rgba(13, 27, 42, 0.08), 0 1px 2px rgba(13, 27, 42, 0.04);
  --shadow-md: 0 4px 6px rgba(13, 27, 42, 0.06), 0 2px 4px rgba(13, 27, 42, 0.04);
  --shadow-lg: 0 10px 15px rgba(13, 27, 42, 0.06), 0 4px 6px rgba(13, 27, 42, 0.04);

  /* Layout */
  --container-max: 1120px;
  --nav-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--svalin-navy);
  background: var(--svalin-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--env-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--svalin-navy);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 600;
}

/* --- Utility --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--svalin-border);
  z-index: 100;
  transition: box-shadow 0.2s ease;
}

.nav.scrolled {
  box-shadow: var(--shadow);
}

.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--svalin-navy);
}

.nav__logo {
  width: 32px;
  height: 32px;
}

.nav__wordmark {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: var(--tracking-wordmark);
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-ui);
  font-weight: 500;
  color: var(--svalin-muted);
  transition: color 0.15s ease;
}

.nav__link:hover {
  color: var(--svalin-navy);
}

.nav__link.active {
  color: var(--env-accent);
  position: relative;
}

.nav__link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--env-accent);
  border-radius: 1px;
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.25rem;
  font-size: var(--text-ui);
  font-weight: 600;
  color: var(--svalin-surface);
  background: var(--svalin-navy);
  border-radius: var(--radius);
  transition: background 0.15s ease, transform 0.15s ease;
}

.nav__cta:hover {
  background: #1a2d42;
  color: var(--svalin-surface);
  transform: translateY(-1px);
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--svalin-navy);
  margin: 4px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -4px);
}

/* --- Hero --- */
.hero {
  padding: calc(var(--nav-height) + var(--space-5xl)) 0 var(--space-5xl);
  text-align: center;
  background: linear-gradient(180deg, var(--env-bg) 0%, var(--svalin-surface) 100%);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.375rem 1rem;
  font-size: var(--text-meta);
  font-weight: 500;
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--env-accent);
  background: var(--env-accent-subtle);
  border: 1px solid rgba(74, 144, 184, 0.2);
  border-radius: 999px;
  margin-bottom: var(--space-xl);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--svalin-amber);
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 600;
  letter-spacing: var(--tracking-display);
  color: var(--svalin-navy);
  margin-bottom: var(--space-lg);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero__title em {
  font-style: normal;
  color: var(--env-accent);
}

.hero__subtitle {
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--svalin-muted);
  max-width: 560px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.5;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn--primary {
  color: var(--svalin-surface);
  background: var(--svalin-navy);
  box-shadow: var(--shadow);
}

.btn--primary:hover {
  background: #1a2d42;
  color: var(--svalin-surface);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  color: var(--svalin-navy);
  background: var(--svalin-surface);
  border: 1px solid var(--svalin-border);
}

.btn--secondary:hover {
  background: var(--env-bg);
  color: var(--svalin-navy);
  border-color: var(--svalin-muted);
}

.btn--large {
  padding: 0.875rem 2rem;
  font-size: var(--text-lg);
}

.btn--accent {
  color: var(--svalin-surface);
  background: var(--env-accent);
}

.btn--accent:hover {
  background: #3a7da3;
  color: var(--svalin-surface);
  transform: translateY(-1px);
}

/* --- Sections --- */
.section {
  padding: var(--space-5xl) 0;
}

.section--alt {
  background: var(--env-bg);
}

.section--navy {
  background: var(--svalin-navy);
  color: var(--svalin-ice);
}

.section__overline {
  font-size: var(--text-meta);
  font-weight: 500;
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--env-accent);
  margin-bottom: var(--space-sm);
}

.section__title {
  font-size: var(--text-h1);
  font-weight: 600;
  letter-spacing: var(--tracking-h1);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--svalin-muted);
  max-width: 560px;
  line-height: 1.5;
}

.section--navy .section__subtitle {
  color: rgba(240, 244, 248, 0.7);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section__header .section__subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* --- Problem / Why Now --- */
.why-now__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.why-now__content {
  max-width: 480px;
}

.why-now__text {
  font-size: var(--text-body);
  color: var(--svalin-muted);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.why-now__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.why-now__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.why-now__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--env-accent-subtle);
  border-radius: var(--radius);
  color: var(--env-accent);
}

.why-now__item-title {
  font-size: var(--text-body);
  font-weight: 600;
  margin-bottom: 2px;
}

.why-now__item-desc {
  font-size: var(--text-ui);
  color: var(--svalin-muted);
}

.why-now__visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.regulation-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--svalin-surface);
  border: 1px solid var(--svalin-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.regulation-card__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: var(--text-xl);
  font-weight: 700;
}

.regulation-card__icon--eu {
  background: #003399;
  color: #FFD700;
}

.regulation-card__icon--iso {
  background: var(--env-accent-subtle);
  color: var(--env-accent);
}

.regulation-card__icon--soc {
  background: #f0fdf4;
  color: var(--color-success);
}

.regulation-card__icon--nist {
  background: #fef3c7;
  color: var(--color-warning);
}

.regulation-card__title {
  font-size: var(--text-body);
  font-weight: 600;
  margin-bottom: 2px;
}

.regulation-card__desc {
  font-size: var(--text-ui);
  color: var(--svalin-muted);
}

/* --- Features --- */
.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-2xl);
  background: var(--svalin-surface);
  border: 1px solid var(--svalin-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--env-accent-subtle);
  border-radius: var(--radius-lg);
  color: var(--env-accent);
  margin-bottom: var(--space-lg);
}

.feature-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card__desc {
  font-size: var(--text-body);
  color: var(--svalin-muted);
  line-height: 1.6;
}

/* --- Compliance Bar --- */
.compliance__items {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}

.compliance__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

.compliance__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  font-weight: 700;
  font-size: var(--text-ui);
}

.compliance__label {
  font-size: var(--text-ui);
  font-weight: 500;
  color: var(--svalin-muted);
}

/* --- Audience --- */
.audience__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.audience-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  background: var(--svalin-surface);
  border: 1px solid var(--svalin-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.audience-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--env-accent-subtle);
  border-radius: 50%;
  color: var(--env-accent);
  margin: 0 auto var(--space-lg);
}

.audience-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.audience-card__desc {
  font-size: var(--text-body);
  color: var(--svalin-muted);
  line-height: 1.6;
}

/* --- CTA Banner --- */
.cta-banner {
  text-align: center;
  padding: var(--space-4xl) 0;
}

.cta-banner__title {
  font-size: var(--text-h1);
  font-weight: 600;
  letter-spacing: var(--tracking-h1);
  margin-bottom: var(--space-md);
}

.section--navy .cta-banner__title {
  color: var(--svalin-ice);
}

.cta-banner__text {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2xl);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.section--navy .cta-banner__text {
  color: rgba(240, 244, 248, 0.7);
}

.section--navy .btn--primary {
  background: var(--svalin-amber);
  color: var(--svalin-navy);
}

.section--navy .btn--primary:hover {
  background: #d49a28;
  color: var(--svalin-navy);
}

/* --- Footer --- */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--svalin-border);
  background: var(--env-bg);
}

.footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--svalin-navy);
  margin-bottom: var(--space-sm);
}

.footer__brand-logo {
  width: 24px;
  height: 24px;
}

.footer__brand-name {
  font-size: var(--text-body);
  font-weight: 700;
  letter-spacing: var(--tracking-wordmark);
  text-transform: uppercase;
}

.footer__tagline {
  font-size: var(--text-ui);
  color: var(--svalin-muted);
}

.footer__nav {
  display: flex;
  gap: var(--space-3xl);
}

.footer__col-title {
  font-size: var(--text-meta);
  font-weight: 500;
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--svalin-muted);
  margin-bottom: var(--space-md);
}

.footer__col-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__link {
  font-size: var(--text-ui);
  color: var(--svalin-navy);
  transition: color 0.15s ease;
}

.footer__link:hover {
  color: var(--env-accent);
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--svalin-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-meta);
  color: var(--svalin-muted);
}

/* --- Scroll Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* Stagger children */
.stagger > .fade-up:nth-child(1) { transition-delay: 0s; }
.stagger > .fade-up:nth-child(2) { transition-delay: 0.1s; }
.stagger > .fade-up:nth-child(3) { transition-delay: 0.2s; }
.stagger > .fade-up:nth-child(4) { transition-delay: 0.3s; }

/* --- Demo Page --- */
.demo-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.demo-page__content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-3xl)) var(--space-lg) var(--space-3xl);
}

.demo-page__wrapper {
  max-width: 720px;
  width: 100%;
  text-align: center;
}

.demo-page__title {
  font-size: var(--text-h1);
  font-weight: 600;
  letter-spacing: var(--tracking-h1);
  margin-bottom: var(--space-sm);
}

.demo-page__subtitle {
  font-size: var(--text-lg);
  color: var(--svalin-muted);
  margin-bottom: var(--space-2xl);
}

.demo-page__iframe-wrapper {
  background: var(--svalin-surface);
  border: 1px solid var(--svalin-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.demo-page__iframe-wrapper iframe {
  display: block;
  width: 100%;
  min-height: 600px;
  border: none;
}

/* --- Info Pages (Privacy, Terms, Contact) --- */
.info-page {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-5xl);
}

.info-page__content {
  max-width: 720px;
  margin: 0 auto;
}

.info-page__title {
  font-size: var(--text-h1);
  font-weight: 600;
  letter-spacing: var(--tracking-h1);
  margin-bottom: var(--space-sm);
}

.info-page__meta {
  font-size: var(--text-ui);
  color: var(--svalin-muted);
  margin-bottom: var(--space-3xl);
}

.info-page__content h2 {
  font-size: var(--text-h2);
  font-weight: 600;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.info-page__content h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.info-page__content p {
  color: var(--svalin-muted);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.info-page__content ul {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

.info-page__content li {
  color: var(--svalin-muted);
  line-height: 1.7;
  list-style: disc;
  margin-bottom: var(--space-xs);
}

.info-page__content a {
  color: var(--env-accent);
}

/* --- Contact Page --- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  margin-top: var(--space-2xl);
}

.contact__card {
  padding: var(--space-2xl);
  background: var(--env-bg);
  border-radius: var(--radius-xl);
  text-align: center;
}

.contact__card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--env-accent-subtle);
  border-radius: 50%;
  color: var(--env-accent);
  margin: 0 auto var(--space-md);
}

.contact__card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.contact__card-text {
  font-size: var(--text-body);
  color: var(--svalin-muted);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --text-hero: 2.25rem;
    --text-h1: 1.625rem;
    --text-display: 2rem;
  }

  .nav__links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--svalin-surface);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    z-index: 99;
  }

  .nav__links.open {
    display: flex;
  }

  .nav__toggle {
    display: block;
  }

  .hero {
    padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-3xl);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .why-now__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .audience__grid {
    grid-template-columns: 1fr;
  }

  .compliance__items {
    gap: var(--space-xl);
  }

  .footer__inner {
    flex-direction: column;
  }

  .footer__nav {
    flex-wrap: wrap;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .contact__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }

  .hero__actions .btn {
    width: 100%;
  }
}