/* =========================================================================
   VCF Tools Hub — Stylesheet
   ITQ brand design system
   ========================================================================= */

/* -------------------------------------------------------------------------
   Font faces
   ------------------------------------------------------------------------- */
@font-face {
  font-family: 'Metropolis';
  src: url('./assets/fonts/Metropolis-ExtraLight.ttf') format('truetype');
  font-weight: 200;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Metropolis';
  src: url('./assets/fonts/Metropolis-Light.ttf') format('truetype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Metropolis';
  src: url('./assets/fonts/Metropolis-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Metropolis';
  src: url('./assets/fonts/Metropolis-Medium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Metropolis';
  src: url('./assets/fonts/Metropolis-SemiBold.ttf') format('truetype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Titillium';
  src: url('./assets/fonts/Titillium-Regular.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Titillium';
  src: url('./assets/fonts/Titillium-Semibold.otf') format('opentype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Titillium';
  src: url('./assets/fonts/Titillium-Bold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* -------------------------------------------------------------------------
   Custom properties — brand tokens + theme tokens
   ------------------------------------------------------------------------- */
:root {
  /* ITQ brand colors */
  --itq-royal: #040559;
  --itq-royal-2: #0a0c7a;
  --itq-orange: #FF4F41;
  --itq-orange-hover: #e8392b;
  --itq-light-blue: #CDE3F7;
  --itq-gold: #F3BA16;
  --itq-gray: #53565A;
  --itq-success: #23800A;

  /* Fonts */
  --font-heading: 'Titillium', -apple-system, 'Segoe UI', sans-serif;
  --font-body: 'Metropolis', Arial, sans-serif;

  /* Layout */
  --max-width: 1200px;
  --radius: 12px;
  --transition-fast: 0.18s ease;

  /* Light theme tokens (default) */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F8F9;
  --color-surface: #FFFFFF;
  --color-text: #1B1D2A;
  --color-text-muted: var(--itq-gray);
  --color-heading: var(--itq-royal);
  --color-accent: var(--itq-orange);
  --color-accent-hover: var(--itq-orange-hover);
  --color-border: #E4E6EA;
  --color-header-bg: linear-gradient(135deg, var(--itq-royal) 0%, var(--itq-royal-2) 100%);
  --color-header-text: #FFFFFF;
  --color-hero-bg: linear-gradient(135deg, var(--itq-royal) 0%, var(--itq-royal-2) 100%);
  --color-hero-text: #FFFFFF;
  --color-hero-muted: var(--itq-light-blue);
  --color-card-shadow: 0 1px 3px rgba(4, 5, 89, 0.08), 0 1px 2px rgba(4, 5, 89, 0.06);
  --color-card-shadow-hover: 0 12px 24px rgba(4, 5, 89, 0.14), 0 4px 8px rgba(4, 5, 89, 0.08);
  --color-focus-ring: var(--itq-orange);
}

html[data-theme="dark"] {
  --color-bg: #1B1D36;
  --color-bg-alt: #191A30;
  --color-surface: #24263F;
  --color-text: #F2F3F7;
  --color-text-muted: #B6B8C8;
  --color-heading: #F2F3F7;
  --color-accent: #FF6F63;
  --color-accent-hover: #ff8a80;
  --color-border: #33355A;
  --color-header-bg: #02033a;
  --color-header-text: #F2F3F7;
  --color-hero-bg: linear-gradient(135deg, #02033a 0%, var(--itq-royal-2) 100%);
  --color-hero-text: #F2F3F7;
  --color-hero-muted: var(--itq-light-blue);
  --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.3);
  --color-card-shadow-hover: 0 14px 28px rgba(0, 0, 0, 0.45), 0 4px 10px rgba(0, 0, 0, 0.3);
  --color-focus-ring: var(--itq-light-blue);
}

/* Fallback for browsers/agents that respect OS preference before JS sets data-theme */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --color-bg: #1B1D36;
    --color-bg-alt: #191A30;
    --color-surface: #24263F;
    --color-text: #F2F3F7;
    --color-text-muted: #B6B8C8;
    --color-heading: #F2F3F7;
    --color-accent: #FF6F63;
    --color-accent-hover: #ff8a80;
    --color-border: #33355A;
    --color-header-bg: #02033a;
    --color-header-text: #F2F3F7;
    --color-hero-bg: linear-gradient(135deg, #02033a 0%, var(--itq-royal-2) 100%);
    --color-hero-text: #F2F3F7;
    --color-hero-muted: var(--itq-light-blue);
    --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.3);
    --color-card-shadow-hover: 0 14px 28px rgba(0, 0, 0, 0.45), 0 4px 10px rgba(0, 0, 0, 0.3);
    --color-focus-ring: var(--itq-light-blue);
  }
}

/* -------------------------------------------------------------------------
   Reset / base
   ------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

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

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-heading);
  margin: 0 0 0.5em;
  line-height: 1.25;
}

p {
  margin: 0 0 1em;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font-family: inherit;
}

/* -------------------------------------------------------------------------
   Accessibility utilities — skip link + focus states
   ------------------------------------------------------------------------- */
.skip-nav {
  position: fixed;
  top: -100px;
  left: 12px;
  z-index: 1000;
  background: var(--itq-royal);
  color: #FFFFFF;
  padding: 12px 20px;
  border-radius: 0 0 8px 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-nav:focus {
  top: 0;
  text-decoration: none;
  outline: 3px solid var(--itq-gold);
  outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
.theme-toggle:focus-visible,
.tool-card__cta:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 3px;
  border-radius: 4px;
}

/* -------------------------------------------------------------------------
   Site header
   ------------------------------------------------------------------------- */
.site-header {
  background: var(--color-header-bg);
  color: var(--color-header-text);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-header-text);
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--itq-orange);
}

.brand__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-header-text);
  letter-spacing: 0.01em;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-link {
  color: var(--color-header-text);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  opacity: 0.9;
}

.header-link:hover {
  opacity: 1;
  color: var(--itq-gold);
  text-decoration: none;
}

.header-link--button {
  background: none;
  border: none;
  padding: 4px 0;
  margin: 0;
  cursor: pointer;
}

.header-link--button[aria-pressed="true"] {
  color: var(--itq-gold);
  opacity: 1;
}

/* Theme toggle button */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-header-text);
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.16);
}

.theme-toggle:active {
  transform: scale(0.94);
}

.theme-toggle__icon {
  display: none;
}

/* Show sun icon in light mode (prompts "switch to dark"),
   show moon icon in dark mode (prompts "switch to light") */
html[data-theme="light"] .theme-toggle__icon--sun {
  display: block;
}

html[data-theme="dark"] .theme-toggle__icon--moon {
  display: block;
}

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */
.hero {
  background: var(--color-hero-bg);
  color: var(--color-hero-text);
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 20px;
  text-align: center;
}

.hero__eyebrow {
  font-family: var(--font-heading);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--color-hero-muted);
  margin: 0 0 16px;
}

.hero__title {
  color: var(--color-hero-text);
  font-size: 1.9rem;
  font-weight: 700;
  max-width: 46rem;
  margin: 0 auto 16px;
}

.hero__subtitle {
  color: var(--color-hero-muted);
  font-size: 1.05rem;
  max-width: 40rem;
  margin: 0 auto;
}

/* -------------------------------------------------------------------------
   Tools section + grid + cards
   ------------------------------------------------------------------------- */
.tools {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 20px 72px;
}

.section-title {
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: 32px;
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}

.tool-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--color-card-shadow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

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

.tool-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 10px;
  margin-bottom: 16px;
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  color: var(--color-accent);
}

.tool-card__title {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.tool-card__tagline {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.tool-card__features {
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tool-card__features li {
  position: relative;
  padding-left: 26px;
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.5;
}

.tool-card__features li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--itq-success) 15%, transparent);
  color: var(--itq-success);
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 18px;
  text-align: center;
}

.tool-card__cta {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--itq-orange);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 22px;
  border-radius: 8px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.tool-card__cta:hover {
  background: var(--itq-orange-hover);
  text-decoration: none;
  color: #FFFFFF;
}

.tool-card__cta:active {
  transform: translateY(1px);
}

/* -------------------------------------------------------------------------
   About page (inline view swap, see #view-about in index.html)
   ------------------------------------------------------------------------- */
.view {
  width: 100%;
}

.about-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 20px 72px;
}

.about-page__hero {
  background: var(--color-hero-bg);
  color: var(--color-hero-text);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  margin-bottom: 32px;
}

.about-page__eyebrow {
  font-family: var(--font-heading);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--color-hero-muted);
  margin: 0 0 16px;
}

.about-page__title {
  color: var(--color-hero-text);
  font-size: 1.9rem;
  font-weight: 700;
  max-width: 46rem;
  margin: 0 auto 16px;
}

.about-page__subtitle {
  color: var(--color-hero-muted);
  font-size: 1rem;
  max-width: 40rem;
  margin: 0 auto;
}

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

.about-page__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--color-card-shadow);
}

.about-page__card-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-size: 1.15rem;
  font-family: var(--font-heading);
  color: var(--color-heading);
  margin: 0 0 20px;
}

.about-page__text {
  color: var(--color-text);
  font-size: 1rem;
  margin-bottom: 24px;
}

.about-page__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.about-page__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-heading);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 18px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.about-page__link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  text-decoration: none;
}

.about-page__certs-count {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.about-page__version {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0 0 8px;
}

.about-page__version-number {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-accent);
}

.about-page__version-date {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin: 0;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px 12px;
  margin: 0 auto;
  max-width: none;
}

.cert-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.cert-badge img {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-surface);
  box-shadow: var(--color-card-shadow);
}

.cert-badge span {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.3;
}

/* -------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.site-footer__inner p {
  margin: 0;
}

/* -------------------------------------------------------------------------
   Responsive — tablet (>= 640px)
   ------------------------------------------------------------------------- */
@media (min-width: 640px) {
  .site-header__inner,
  .hero__inner,
  .tools,
  .about-page,
  .site-footer__inner {
    padding-left: 24px;
    padding-right: 24px;
  }

  .hero__inner {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .hero__title {
    font-size: 2.4rem;
  }

  .hero__subtitle {
    font-size: 1.1rem;
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }

  .cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px 20px;
  }

  .cert-badge img {
    width: 84px;
    height: 84px;
  }

  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* -------------------------------------------------------------------------
   Responsive — desktop (>= 1024px)
   ------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .site-header__inner,
  .hero__inner,
  .tools,
  .about-page,
  .site-footer__inner {
    padding-left: 32px;
    padding-right: 32px;
  }

  .hero__title {
    font-size: 2.9rem;
  }

  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .tools {
    padding-top: 64px;
    padding-bottom: 96px;
  }

  .section-title {
    font-size: 1.6rem;
  }
}

/* -------------------------------------------------------------------------
   Reduced motion
   ------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }

  .tool-card:hover {
    transform: none;
  }

  .theme-toggle:active {
    transform: none;
  }

  .tool-card__cta:active {
    transform: none;
  }
}

/* -------------------------------------------------------------------------
   Scrollbar styling (nice-to-have, matches other ITQ tools)
   ------------------------------------------------------------------------- */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-alt);
}

::-webkit-scrollbar-thumb {
  background-color: var(--itq-gray);
  border-radius: 8px;
  border: 3px solid var(--color-bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--itq-orange);
}

html {
  scrollbar-color: var(--itq-gray) var(--color-bg-alt);
  scrollbar-width: thin;
}