/* ==========================================================================
   Design tokens (source of truth: DESIGN_SYSTEM.md)
   ========================================================================== */

:root {
  /* brand colors */
  --color-primary: #023047;
  --color-accent: #219EBC;
  --color-secondary: #8ECAE6;
  --color-accent-warm: #FFB703;
  --color-accent-warm-strong: #FB8500;

  /* neutrals */
  --color-bg: #FFFFFF;
  --color-bg-subtle: #F7F9FA;
  --color-border: #E2E8ED;
  --color-text: #1A2530;
  --color-text-muted: #5B6B78;
  --color-text-on-dark: #F7F9FA;

  /* type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.75rem;

  /* spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* shape */
  --radius-sm: 4px;
  --radius-md: 8px;

  /* elevation */
  --shadow-elevated: 0 1px 3px rgba(2, 48, 71, 0.08);
}

/* ==========================================================================
   Base / reset
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition-duration: 0.01ms !important;
  }
}

body,
h1, h2, h3,
p, dl, dd,
ul, figure {
  margin: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
}

h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-8);
}

h3 {
  font-size: var(--text-xl);
}

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

a {
  color: var(--color-accent);
}

a:hover {
  color: var(--color-primary);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.container {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-6);
  }
}

.section {
  padding-block: var(--space-16);
}

.section--subtle {
  background-color: var(--color-bg-subtle);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--space-24);
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  font-weight: 700;
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  transition: background-color 200ms ease, color 200ms ease;
}

.btn--cta {
  background-color: var(--color-accent-warm);
  color: var(--color-primary);
}

.btn--cta:hover {
  background-color: var(--color-accent-warm-strong);
  color: var(--color-primary);
}

/* ==========================================================================
   Header / nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: var(--color-bg);
  box-shadow: var(--shadow-elevated);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

.site-mark {
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-primary);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .nav-list {
    gap: var(--space-6);
  }
}

.nav-list a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--text-sm);
}

.nav-list a:hover {
  color: var(--color-accent);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  background-color: var(--color-primary);
  color: var(--color-text-on-dark);
  padding-block: var(--space-16);
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
  text-align: center;
}

.hero__portrait {
  width: 12rem;
  height: 12rem;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-secondary);
}

.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

.hero__name {
  font-size: var(--text-3xl);
  color: var(--color-text-on-dark);
}

.hero__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-secondary);
}

.hero__tagline {
  font-size: var(--text-lg);
  max-width: 40rem;
}

@media (min-width: 768px) {
  .hero {
    padding-block: var(--space-24);
  }

  .hero__inner {
    flex-direction: row;
    text-align: left;
  }

  .hero__content {
    align-items: flex-start;
  }

  .hero__portrait {
    width: 16rem;
    height: 16rem;
    flex-shrink: 0;
  }
}

/* ==========================================================================
   About
   ========================================================================== */

.about__bio {
  font-size: var(--text-lg);
  max-width: 48rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.focus-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .focus-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.focus-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.focus-card__image-wrap {
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  background-color: var(--color-primary);
}

.focus-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 200ms ease;
}

.focus-card__image-link:hover .focus-card__image,
.focus-card__image-link:focus-visible .focus-card__image {
  transform: scale(1.03);
}

.focus-card__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.focus-card p {
  color: var(--color-text-muted);
}

/* ==========================================================================
   Certifications
   ========================================================================== */

.cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .cert-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.cert-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}

.cert-card__badge {
  width: 3.5rem;
  height: 3.5rem;
  object-fit: contain;
}

.cert-card__name {
  font-size: var(--text-lg);
}

.cert-card__dates {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.cert-card__date-row {
  display: flex;
  gap: var(--space-2);
}

.cert-card__date-row dt {
  font-weight: 600;
}

.cert-card__date-row dt::after {
  content: ":";
}

.cert-card__link {
  margin-top: auto;
  font-weight: 600;
  font-size: var(--text-sm);
}

/* ==========================================================================
   Footer / contact
   ========================================================================== */

.site-footer {
  background-color: var(--color-primary);
  color: var(--color-text-on-dark);
  padding-block: var(--space-16);
}

.site-footer h2 {
  color: var(--color-text-on-dark);
}

.site-footer a {
  color: var(--color-secondary);
}

.site-footer a:hover {
  color: var(--color-accent-warm);
}

.site-footer p {
  margin-bottom: var(--space-2);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-2);
}

.site-footer__links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.site-footer__links svg {
  width: var(--space-4);
  height: var(--space-4);
  flex-shrink: 0;
}

.site-footer__copyright {
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-secondary);
}

.site-footer__attribution {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-secondary);
}