/* ============================================================
   Celeste Astrid Wallenberg — Executive Resume
   Light Multi-Page / Swiss Editorial Design System
   ============================================================ */

/* --- OKLCH Color Tokens --- */
:root {
  --color-bg:          oklch(0.965 0.005 80);
  --color-bg-alt:      oklch(0.935 0.006 80);
  --color-bg-elevated: oklch(0.98 0.003 80);
  --color-text:        oklch(0.22 0.01 260);
  --color-text-muted:  oklch(0.55 0.015 80);
  --color-accent:      oklch(0.40 0.08 260);
  --color-accent-hover:oklch(0.35 0.10 260);
  --color-rule:        oklch(0.82 0.008 80);
  --color-rule-strong: oklch(0.70 0.01 80);

  --font-sans: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", "Fira Code", monospace;

  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  2rem;
  --space-xl:  3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  --max-width: 1120px;
  --nav-height: 3.5rem;

  --transition-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0;
  color: var(--color-text);
}

h1 { font-size: 3.4rem; }
h2 { font-size: 2.1rem; }
h3 { font-size: 1.4rem; }

.display-heading {
  font-size: 4.8rem;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.05;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

p + p { margin-top: var(--space-md); }

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.section {
  padding-block: var(--space-2xl);
}

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

.rule {
  border: none;
  border-top: 1px solid var(--color-rule);
  margin-block: var(--space-xl);
}

.rule--strong {
  border-top-color: var(--color-rule-strong);
  border-top-width: 2px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (max-width: 768px) {
  .split {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  h1 { font-size: 2.55rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.25rem; }
  .display-heading { font-size: 3.1rem; }
}

/* --- Header / Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-rule);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

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

.site-header__logo {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  max-width: min(42vw, 360px);
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__logo:hover {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  list-style: none;
}

.site-nav__link {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-xs);
  position: relative;
  transition: color var(--transition-base);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-text);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  width: 100%;
}

.site-nav__email {
  padding-left: var(--space-md);
  border-left: 1px solid var(--color-rule);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.site-nav__email:hover {
  color: var(--color-accent);
}

@media (max-width: 1040px) {
  .site-nav__email {
    display: none;
  }
}

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

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: var(--transition-base);
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .site-nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-rule);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 300ms ease, opacity 200ms ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav__email {
    display: inline-block;
    border-left: none;
    padding-left: 0;
    font-size: 0.82rem;
  }
}

/* --- Footer --- */
.site-footer {
  margin-top: auto;
  padding-block: var(--space-xl);
  border-top: 1px solid var(--color-rule);
  background-color: var(--color-bg-alt);
}

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

.site-footer__text {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.site-footer__link {
  font-size: 0.82rem;
  color: var(--color-text);
}

/* --- Hero (Index) --- */
.hero {
  padding-block: var(--space-3xl) var(--space-2xl);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-2xl);
  align-items: center;
}

.hero__title {
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: var(--space-lg);
}

.hero__tagline {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-text-muted);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin-top: var(--space-lg);
}

.hero__contact {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  margin-top: var(--space-lg);
  font-size: 0.92rem;
}

.hero__contact span {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero__portrait {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: grayscale(20%);
  border: 1px solid var(--color-rule);
}

@media (max-width: 768px) {
  .hero__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__portrait {
    max-width: 240px;
    margin-inline: auto;
    order: -1;
  }

  .hero__tagline {
    text-align: left;
  }

  .hero__contact {
    justify-content: center;
  }
}

/* --- Metrics Band --- */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  padding-block: var(--space-xl);
  border-top: 2px solid var(--color-text);
  border-bottom: 1px solid var(--color-rule);
}

.metrics__item {
  text-align: left;
}

.metrics__value {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--color-text);
  display: block;
}

.metrics__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

@media (max-width: 768px) {
  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .metrics__value {
    font-size: 1.75rem;
  }
}

/* --- Page Header (sub-pages) --- */
.page-header {
  padding-block: var(--space-2xl) var(--space-xl);
  border-bottom: 1px solid var(--color-rule);
}

.page-header__title {
  margin-bottom: var(--space-sm);
}

.page-header__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  font-weight: 400;
  max-width: 640px;
}

/* --- Content Blocks --- */
.content-block {
  padding-block: var(--space-xl);
  border-bottom: 1px solid var(--color-rule);
}

.content-block:last-child {
  border-bottom: none;
}

.content-block__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.content-block__title {
  font-size: 1.4rem;
  margin-bottom: var(--space-md);
}

.content-block__text {
  color: var(--color-text);
  max-width: 680px;
  line-height: 1.75;
}

/* --- Timeline (Career) --- */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-rule);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-xl);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-xl) - 4px);
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 2px solid var(--color-bg);
}

.timeline__period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.timeline__role {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.timeline__org {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.timeline__desc {
  line-height: 1.7;
  max-width: 640px;
}

/* --- Expertise Grid --- */
.expertise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.expertise-item {
  padding: var(--space-xl);
  border-bottom: 1px solid var(--color-rule);
  border-right: 1px solid var(--color-rule);
}

.expertise-item:nth-child(2n) {
  border-right: none;
}

.expertise-item:nth-last-child(-n+2) {
  border-bottom: none;
}

.expertise-item__number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.expertise-item__title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.expertise-item__desc {
  color: var(--color-text-muted);
  line-height: 1.7;
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .expertise-grid {
    grid-template-columns: 1fr;
  }

  .expertise-item {
    border-right: none;
  }

  .expertise-item:nth-last-child(-n+2) {
    border-bottom: 1px solid var(--color-rule);
  }

  .expertise-item:last-child {
    border-bottom: none;
  }
}

/* --- Publications / Board --- */
.pub-list {
  list-style: none;
}

.pub-list__item {
  padding-block: var(--space-lg);
  border-bottom: 1px solid var(--color-rule);
}

.pub-list__item:last-child {
  border-bottom: none;
}

.pub-list__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

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

/* --- Contact Form --- */
.contact-form {
  max-width: 560px;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-rule);
  border-radius: 0;
  transition: border-color var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 160px;
  resize: vertical;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-bg);
  background-color: var(--color-text);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-base), transform 100ms ease;
}

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

.btn:active {
  transform: scale(0.98);
}

/* --- Contact Info --- */
.contact-info {
  padding-left: var(--space-xl);
  border-left: 2px solid var(--color-rule);
}

.contact-info__item {
  margin-bottom: var(--space-lg);
}

.contact-info__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.contact-info__value {
  font-size: 1.05rem;
}

/* --- Animations --- */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 600ms ease, transform 600ms ease;
  }

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

  .stagger > .fade-in:nth-child(1) { transition-delay: 0ms; }
  .stagger > .fade-in:nth-child(2) { transition-delay: 80ms; }
  .stagger > .fade-in:nth-child(3) { transition-delay: 160ms; }
  .stagger > .fade-in:nth-child(4) { transition-delay: 240ms; }
  .stagger > .fade-in:nth-child(5) { transition-delay: 320ms; }
  .stagger > .fade-in:nth-child(6) { transition-delay: 400ms; }
}

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* --- Print --- */
@media print {
  .site-header,
  .nav-toggle,
  .site-footer {
    display: none;
  }

  body {
    font-size: 11pt;
    color: #000;
    background: #fff;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}