/* =========================================================
   Elías Mattfeld Campos — Portfolio
   Mobile-first stylesheet. Breakpoints: 375 (base), 768, 1280.
   ========================================================= */

:root {
  --color-bg: #ffffff;
  --color-surface: #f4f5f6;
  --color-border: #dde1e4;
  --color-text: #1f2428;
  --color-text-muted: #565f66;
  --color-accent: #2f6f5e;
  --color-accent-dark: #244f43;
  --color-accent-contrast: #ffffff;
  --color-focus: #1d5ea8;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-heading: var(--font-body);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --radius: 8px;
  --max-width: 1120px;
  --header-height: 60px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  font-size: 1rem;
}
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { font-family: var(--font-heading); line-height: 1.2; margin: 0 0 var(--space-3); font-weight: 700; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 var(--space-4); }
a { color: var(--color-accent-dark); }
ul, ol { padding-left: 1.25rem; }
button { font-family: inherit; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent-dark);
  color: #fff;
  padding: var(--space-3) var(--space-4);
  z-index: 200;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus {
  left: 0;
}

/* =========================
   Header / Navigation
   ========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-3);
}
.site-title {
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-text);
}
.site-title:hover { color: var(--color-accent-dark); }

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}
.lang-toggle:hover { background: var(--color-border); }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}
.nav-toggle svg { width: 22px; height: 22px; }

.main-nav {
  display: none;
  border-top: 1px solid var(--color-border);
}
.main-nav.is-open { display: block; }
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: var(--space-3) 0;
  display: flex;
  flex-direction: column;
}
.main-nav a {
  display: block;
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  border-radius: var(--radius);
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  background: var(--color-surface);
  color: var(--color-accent-dark);
}

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .main-nav {
    display: block;
    border-top: none;
  }
  .main-nav ul {
    flex-direction: row;
    padding: 0;
    gap: var(--space-1);
  }
  .main-nav a { padding: var(--space-2) var(--space-3); }
  .header-inner { padding: 0; }
}

/* =========================
   Buttons
   ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  min-height: 44px;
}
.btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}
.btn-primary:hover { background: var(--color-accent-dark); }
.btn-secondary {
  background: transparent;
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}
.btn-secondary:hover { background: var(--color-surface); }
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* =========================
   Hero
   ========================= */
.hero {
  padding: var(--space-7) 0 var(--space-6);
}
.hero-photo {
  width: 100%;
  border-radius: var(--radius);
  margin-bottom: var(--space-5);
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--color-surface);
}
.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.8rem;
  color: var(--color-accent-dark);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.hero-headline {
  font-size: 1.35rem;
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-7);
    align-items: center;
  }
  .hero-photo { margin-bottom: 0; }
  h1 { font-size: 2.4rem; }
}

/* =========================
   Sections
   ========================= */
section {
  padding: var(--space-6) 0;
}
.section-alt {
  background: var(--color-surface);
}
.section-header {
  margin-bottom: var(--space-5);
}
.section-header p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Card grids */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
@media (min-width: 600px) {
  .card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--color-surface);
}
.card-body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
}
.card-body h3 { margin-bottom: 0; }
.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}
.card-body p { margin-bottom: var(--space-2); flex: 1; }
.card-body .card-meta { flex: none; }

.badge {
  display: inline-block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
}
.badge-accent {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  border-color: var(--color-accent);
}

/* What I Do / icon grid */
.icon-card {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}
.icon-card h3 { font-size: 1.05rem; }
.icon-card p { margin-bottom: 0; color: var(--color-text-muted); font-size: 0.95rem; }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}
@media (min-width: 768px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
}
.stat {
  text-align: center;
  padding: var(--space-4);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
}
.stat-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-1);
}
.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.stats-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  font-style: italic;
}

/* =========================
   Steps / process cards (Peace Corps practice)
   ========================= */
.step-list {
  display: grid;
  gap: var(--space-4);
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}
.step-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}
.step-number {
  counter-increment: step;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.step-number::before { content: counter(step); }

/* =========================
   Timeline
   ========================= */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--color-border);
}
.timeline li {
  position: relative;
  padding: 0 0 var(--space-5) var(--space-5);
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
}
.timeline-date {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* =========================
   Disclaimer
   ========================= */
.disclaimer {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  padding: var(--space-4);
  border-radius: var(--radius);
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

/* =========================
   Footer
   ========================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: var(--space-6) 0 var(--space-5);
  margin-top: var(--space-7);
}
.site-footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.footer-tagline {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-text);
  max-width: 42ch;
  margin-bottom: var(--space-5);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding: 0;
  list-style: none;
}
.footer-links a { text-decoration: none; font-size: 0.9rem; }
.back-to-top {
  display: inline-block;
  font-size: 0.85rem;
  text-decoration: none;
}

/* =========================
   Forms / Filters (projects, gallery)
   ========================= */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}
.filter-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.filter-field label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.filter-field input,
.filter-field select {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 44px;
}
.filter-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
@media (min-width: 700px) {
  .filter-row { grid-template-columns: repeat(3, 1fr); }
}
.filter-actions {
  display: flex;
  justify-content: flex-end;
}
.link-button {
  background: none;
  border: none;
  color: var(--color-accent-dark);
  text-decoration: underline;
  cursor: pointer;
  font-size: 0.9rem;
  padding: var(--space-2);
}

.empty-state {
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-muted);
}

/* =========================
   Project detail page
   ========================= */
.project-hero-image {
  width: 100%;
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-surface);
  margin-bottom: var(--space-5);
}
.project-meta-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-5);
}
@media (min-width: 600px) {
  .project-meta-list { grid-template-columns: repeat(2, 1fr); }
}
.project-meta-list dt {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  font-weight: 700;
}
.project-meta-list dd {
  margin: 0;
  font-size: 0.95rem;
}
.project-section {
  padding: var(--space-5) 0;
  border-top: 1px solid var(--color-border);
}
.project-section:first-of-type { border-top: none; }

.doc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.doc-list a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
}
.doc-list a:hover { background: var(--color-surface); }

/* =========================
   Skills
   ========================= */
.skill-group { margin-bottom: var(--space-5); }
.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.skill-badge {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
  font-size: 0.85rem;
}

/* =========================
   Gallery
   ========================= */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
@media (min-width: 600px) {
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 900px) {
  .gallery-grid { grid-template-columns: repeat(4, 1fr); }
}
.gallery-item {
  border: none;
  padding: 0;
  background: none;
  cursor: pointer;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  position: relative;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.gallery-item figcaption { display: none; }

/* =========================
   Resource links
   ========================= */
.resource-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}
.resource-links li { list-style: none; }

/* =========================
   Weekly schedule
   ========================= */
.schedule-box {
  display: flex;
  flex-direction: column;
}
.schedule-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}
.schedule-row:last-child { border-bottom: none; padding-bottom: 0; }
.schedule-row:first-child { padding-top: 0; }
.schedule-row h3 { margin-bottom: 0; }
@media (min-width: 600px) {
  .schedule-row {
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-5);
  }
  .schedule-row .badge { flex: 0 0 auto; min-width: 8rem; text-align: center; }
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 22, 24, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
  padding: var(--space-4);
}
.lightbox.is-open { display: flex; }
.lightbox-content {
  max-width: 900px;
  width: 100%;
  color: #fff;
}
.lightbox-content img {
  width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius);
  background: #000;
}
.lightbox-caption {
  margin-top: var(--space-3);
  font-size: 0.9rem;
  color: #e6e8ea;
}
.lightbox-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-3);
}
.lightbox-controls button {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  min-height: 44px;
}
.lightbox-controls button:hover { background: rgba(255,255,255,0.22); }

/* =========================
   Utility
   ========================= */
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 1280px) {
  .container { padding: 0 var(--space-6); }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #16191b;
    --color-surface: #1f2427;
    --color-border: #33393d;
    --color-text: #eceff1;
    --color-text-muted: #a6adb2;
    --color-accent: #4fa78c;
    --color-accent-dark: #74c2a8;
    --color-accent-contrast: #0d1210;
    --color-focus: #6fb2f0;
  }
  .lightbox { background: rgba(0,0,0,0.96); }
}