/* ==========================================================================
   Ariel Portfolio — Global Styles
   Theme: minimal, professional, light blue accent + neutral palette
   ========================================================================== */

:root {
  --color-primary: #4a90c2;
  --color-primary-dark: #2f6690;
  --color-primary-light: #e8f2fa;
  --color-bg: #ffffff;
  --color-surface: #f7f9fb;
  --color-text: #1f2933;
  --color-text-muted: #5b6670;
  --color-border: #dfe6ec;

  --font-base: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Playfair Display", "Segoe UI", Georgia, serif;
  --max-width: 1080px;
  --radius: 8px;
  --transition: 0.2s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
.hero__name,
.nav__brand {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.01em;
}

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

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

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 1.2rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------------------------------- Header / Nav ------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(6px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.nav__brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.nav__brand:hover {
  text-decoration: none;
  color: var(--color-primary-dark);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

.nav__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  color: var(--color-text-muted);
  font-weight: 500;
}

.nav__links a.is-active,
.nav__links a:hover {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.nav__cta {
  background-color: var(--color-primary);
  color: #fff !important;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 600;
}

.nav__cta:hover {
  background-color: var(--color-primary-dark);
  text-decoration: none;
}

/* ---------------------------------- Buttons ------------------------------ */

.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.btn--primary {
  background-color: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
  text-decoration: none;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary-light);
  text-decoration: none;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* ---------------------------------- Hero --------------------------------- */

.hero {
  padding: 4.5rem 0 3.5rem;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, #ffffff 100%);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero__eyebrow {
  color: var(--color-primary-dark);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.hero__name {
  font-size: 2.75rem;
  line-height: 1.15;
  margin: 0 0 1rem;
}

.hero__tagline {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  max-width: 46ch;
}

.hero__photo {
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  aspect-ratio: 4 / 5;
  max-width: 320px;
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__photo-placeholder {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 1.5rem;
}

/* ---------------------------------- Highlights row ----------------------- */

.highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 3rem 0;
}

.highlight-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.highlight-card h3 {
  margin-top: 0;
  color: var(--color-primary-dark);
  font-size: 1.05rem;
}

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

/* ---------------------------------- Sections ------------------------------ */

.section {
  padding: 3.5rem 0;
}

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

.section__header {
  margin-bottom: 2.25rem;
}

.section__eyebrow {
  color: var(--color-primary-dark);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.section__header h1,
.section__header h2 {
  margin: 0 0 0.75rem;
}

.section__intro {
  color: var(--color-text-muted);
  max-width: 65ch;
}

/* ---------------------------------- Page hero (non-home) ------------------ */

.page-hero {
  padding: 3rem 0 2.5rem;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  margin: 0 0 0.75rem;
}

.page-hero p {
  color: var(--color-text-muted);
  max-width: 60ch;
  margin: 0;
}

/* ---------------------------------- Timeline (Education) ------------------ */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--color-primary);
}

.timeline__item {
  position: relative;
  padding: 0 0 2.5rem 2rem;
}

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

.timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 2px solid #fff;
}

.timeline__meta {
  color: var(--color-primary-dark);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.35rem;
}

.timeline__item h3 {
  margin: 0 0 0.25rem;
}

.timeline__item h4 {
  margin: 0 0 0.75rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.timeline__item ul {
  margin: 0.5rem 0 0;
  color: var(--color-text-muted);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.badge {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* ---------------------------------- Experience cards ----------------------- */

.experience-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.experience-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  background-color: #fff;
}

.experience-card__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.experience-card__header h3 {
  margin: 0;
}

.experience-card__dates {
  color: var(--color-primary-dark);
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

.experience-card__org {
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: 0.85rem;
}

.experience-card ul {
  margin: 0;
  color: var(--color-text-muted);
}

/* ---------------------------------- Contact ------------------------------ */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.contact-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-align: center;
  background-color: #fff;
}

.contact-card h3 {
  margin: 0.75rem 0 0.4rem;
}

.contact-card p {
  color: var(--color-text-muted);
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

.contact-card__icon {
  font-size: 1.75rem;
}

/* ---------------------------------- Footer -------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding: 2rem 0;
}

.footer__grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer__links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__links a {
  color: var(--color-text-muted);
  font-weight: 500;
}

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

/* ---------------------------------- Responsive ---------------------------- */

@media (max-width: 860px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }

  .hero__photo {
    max-width: 260px;
    margin: 0 auto;
  }

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

@media (max-width: 720px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    background-color: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem 1.5rem;
    display: none;
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__cta {
    width: 100%;
    text-align: center;
  }

  .experience-card__header {
    flex-direction: column;
    align-items: flex-start;
  }
}