/* ===== Tokens ===== */
:root {
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --transition: 0.2s ease;
  --max-width: 860px;
}

/* ===== Theme: Dark (default) ===== */
[data-theme="dark"] {
  --bg: #0a0a0b;
  --bg-alt: #111113;
  --surface: #18181b;
  --surface-hover: #1f1f23;
  --border: #27272a;
  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --tag-bg: #1e293b;
  --tag-text: #94a3b8;
  --nav-bg: rgba(10, 10, 11, 0.85);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background var(--transition),
    color var(--transition);
}

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

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

ul {
  list-style: none;
}

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

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

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

/* Secondary title within a section (e.g. Languages under Education) */
.section-title:not(:first-child) {
  margin-top: var(--space-2xl);
}

/* ===== Nav ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--text);
  letter-spacing: -0.03em;
}

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

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--text);
}

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

.lang-switch {
  position: relative;
  display: flex;
  align-items: center;
  width: 62px;
  height: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition);
}

.lang-switch:hover {
  border-color: var(--text-tertiary);
}

.lang-option {
  position: relative;
  z-index: 1;
  flex: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 26px;
  color: var(--text-tertiary);
  transition: color 0.25s ease;
  user-select: none;
}

.lang-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 28px;
  height: 22px;
  background: var(--accent);
  border-radius: 999px;
  transition: transform 0.25s ease;
}

[data-lang="en"] .lang-en {
  color: #fff;
}
[data-lang="es"] .lang-es {
  color: #fff;
}
[data-lang="es"] .lang-slider {
  transform: translateX(30px);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ===== Hero ===== */
.hero {
  padding: calc(60px + var(--space-3xl)) 0 var(--space-3xl);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-sm);
}

.hero-title {
  font-size: 1.25rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--space-lg);
}

.hero-summary {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.hero-summary strong {
  color: var(--text);
}

.hero-links {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--text-tertiary);
  color: var(--text);
}

/* ===== About ===== */
.about-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.about-content p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-content strong {
  color: var(--text);
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border);
}

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

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -28px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

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

.timeline-header h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.timeline-company {
  display: block;
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 500;
}

.timeline-date {
  display: block;
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.timeline-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.timeline-details li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  line-height: 1.7;
}

.timeline-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

/* ===== Projects ===== */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all 0.3s ease;
}

.project-card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

.project-icon {
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.project-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.project-tags span {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 3px 10px;
  border-radius: 999px;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ===== Education ===== */
.education-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: var(--space-xl);
}

.education-header {
  margin-bottom: var(--space-sm);
}

.education-header h3 {
  font-size: 1.15rem;
  font-weight: 600;
}

.education-degree {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
}

.education-school {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.education-date {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  margin-bottom: var(--space-lg);
}

.education-coursework h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
}

.coursework-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.coursework-tags span {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 3px 10px;
  border-radius: 999px;
}

/* ===== Recognition ===== */
.recognition-intro {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.recognition-toggle {
  display: inline-block;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: var(--space-lg);
}

.recognition-toggle:hover {
  border-color: var(--text-tertiary);
  color: var(--text);
}

.recognition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-xs) var(--space-lg);
  max-height: 0;
  overflow: hidden;
  transition:
    max-height 0.5s ease,
    opacity 0.3s ease;
  opacity: 0;
}

.recognition-grid.visible {
  max-height: 2000px;
  opacity: 1;
}

.recognition-grid span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: var(--space-xs) 0;
}

/* ===== Contact ===== */
.contact-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition);
}

.contact-item:hover {
  color: var(--accent);
}

.contact-item svg {
  flex-shrink: 0;
}

/* ===== Footer ===== */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.footer p {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  text-align: center;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .nav-hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  .hero {
    min-height: auto;
    padding: calc(60px + var(--space-2xl)) 0 var(--space-2xl);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .hero-name {
    font-size: 2.25rem;
  }

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

@media (max-width: 480px) {
  .hero-links {
    flex-direction: column;
  }

  .hero-links .btn {
    text-align: center;
    justify-content: center;
  }

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