/* ============================================
   ADRIA LOPEZ — Main Stylesheet
   ============================================ */

/* Variables */
:root {
  --yellow: #e1b928;
  --yellow-dark: #c9a420;
  --yellow-light: #f0d060;
  --black: #0a0a0a;
  --dark: #111111;
  --dark-2: #1a1a1a;
  --dark-3: #222222;
  --gray: #888888;
  --gray-light: #cccccc;
  --white: #ffffff;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; overflow-x: hidden; }
body {
  font-family: var(--font-body);
  background: var(--black);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4 { font-family: var(--font-heading); line-height: 1.2; }

.section-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
  font-weight: 500;
  margin-bottom: 1rem;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section { padding: 100px 0; }

/* ============================================
   HEADER / NAV
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition), backdrop-filter var(--transition);
}

.site-header.scrolled {
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(225, 185, 40, 0.15);
}

.header-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.header-logo span { color: var(--yellow); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.header-nav a {
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  color: var(--gray-light);
  transition: color var(--transition);
}

.header-nav a:hover { color: var(--white); }

/* Mode toggle */
.mode-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(225, 185, 40, 0.1);
  border: 1px solid rgba(225, 185, 40, 0.3);
  border-radius: 50px;
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.mode-toggle:hover {
  background: rgba(225, 185, 40, 0.2);
  border-color: var(--yellow);
}

.mode-toggle .toggle-option {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  transition: all var(--transition);
}

.mode-toggle .toggle-option.active {
  background: var(--yellow);
  color: var(--black);
}

.mode-toggle .toggle-option:not(.active) {
  color: var(--gray);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
  position: relative;
  z-index: 2;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition);
}

/* Hamburger → X when menu open */
.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(225, 185, 40, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  padding: 4rem 2rem 4rem 4rem;
  max-width: 600px;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.hero-eyebrow::before {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: var(--yellow);
}

.hero-eyebrow span {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yellow);
  font-weight: 500;
}

.hero h1 {
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 1.5rem;
}

.hero h1 .highlight {
  color: var(--yellow);
  font-style: italic;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--gray-light);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 480px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--yellow);
  color: var(--black);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  padding: 0.875rem 2rem;
  border-radius: 4px;
  transition: all var(--transition);
}

.btn-primary:hover {
  background: var(--yellow-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(225, 185, 40, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--white);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  padding: 0.875rem 2rem;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  transition: all var(--transition);
}

.btn-secondary:hover {
  border-color: var(--white);
  transform: translateY(-2px);
}

.hero-image {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  filter: grayscale(20%);
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, var(--black) 0%, transparent 30%),
              linear-gradient(to top, var(--black) 0%, transparent 20%);
}

/* ============================================
   ABOUT
   ============================================ */
.about {
  background: var(--dark);
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 5rem;
  align-items: start;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  position: sticky;
  top: 120px;
}

.stat {
  border-left: 2px solid var(--yellow);
  padding-left: 1.5rem;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  color: var(--yellow);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray);
  margin-top: 0.25rem;
}

.about-text h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 2rem;
  line-height: 1.2;
}

.about-text h2 em {
  color: var(--yellow);
  font-style: italic;
}

.about-text p {
  color: var(--gray-light);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

/* ============================================
   EXPERTISE
   ============================================ */
.expertise {
  position: relative;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 4rem;
}

.expertise-card {
  background: var(--dark-2);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.expertise-card:hover {
  border-color: rgba(225, 185, 40, 0.2);
  transform: translateY(-4px);
}

.expertise-card:hover::before {
  transform: scaleX(1);
}

.expertise-icon {
  font-size: 2rem;
  margin-bottom: 1.25rem;
  display: block;
}

.expertise-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  font-family: var(--font-body);
}

.expertise-card p {
  font-size: 0.9rem;
  color: var(--gray);
  line-height: 1.6;
}

/* ============================================
   EXPERIENCE
   ============================================ */
.experience {
  background: var(--dark);
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 4rem;
  flex-wrap: wrap;
  gap: 2rem;
}

.experience-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 3rem;
  padding: 2.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  align-items: start;
}

.timeline-item:first-child { padding-top: 0; }

.timeline-date {
  font-size: 0.875rem;
  color: var(--yellow);
  font-weight: 500;
  padding-top: 0.25rem;
}

.timeline-content h3 {
  font-family: var(--font-body);
  font-size: 1.1875rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-content .company {
  font-size: 0.875rem;
  color: var(--yellow);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.timeline-content p {
  font-size: 0.9375rem;
  color: var(--gray);
  line-height: 1.7;
}

/* ============================================
   TEACHING
   ============================================ */
.teaching-intro {
  max-width: 700px;
  margin-bottom: 4rem;
}

.teaching-intro p {
  color: var(--gray-light);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-top: 1.5rem;
}

.universities-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.university-card {
  background: var(--dark-2);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transition: all var(--transition);
}

.university-card:hover {
  border-color: rgba(225, 185, 40, 0.2);
}

.university-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.uni-logo {
  height: auto;
  max-height: 36px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  object-position: left center;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

.university-name {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ============================================
   CONTACT
   ============================================ */
.contact {
  background: var(--dark);
  border-top: 1px solid rgba(255,255,255,0.05);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.contact-info h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1.5rem;
}

.contact-info p {
  color: var(--gray-light);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2.5rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--gray-light);
  font-size: 0.9375rem;
  transition: color var(--transition);
}

.contact-link:hover { color: var(--yellow); }

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

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  background: var(--dark-3);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 4px;
  padding: 0.875rem 1rem;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--yellow);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: 3rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-left {
  font-size: 0.875rem;
  color: var(--gray);
}

.footer-left strong { color: var(--yellow); }

.footer-social {
  display: flex;
  gap: 1.5rem;
}

.footer-social a {
  color: var(--gray);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-social a:hover { color: var(--yellow); }

/* ============================================
   MOBILE MENU — KEYFRAMES
   ============================================ */
@keyframes overlayFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes menuLinkIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Scroll lock + hamburger lift when overlay is open */
body.menu-open { overflow: hidden; }
body.menu-open .hamburger { z-index: 300; }

/* ============================================
   ANIMATIONS
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-content {
    padding: 8rem 1.5rem 3rem;
    max-width: 100%;
  }

  .hero-image {
    height: 60vw;
  }

  .hero-image::after {
    background: linear-gradient(to top, var(--black) 0%, transparent 30%);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-stats {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1.5rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}

@media (max-width: 600px) {
  section { padding: 70px 0; }

  .header-nav { display: none; }

  .site-header {
    padding: 1.25rem 1.5rem;
  }

  .hamburger { display: flex; }

  .hero h1 { font-size: 2.75rem; }

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

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

  /* Full-page overlay menu */
  .header-nav.mobile-open {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(10, 10, 10, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    animation: overlayFadeIn 0.25s ease forwards;
  }

  /* WP nav menu <ul> inside overlay */
  .header-nav.mobile-open ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    list-style: none;
  }

  .header-nav.mobile-open a {
    font-size: 1.75rem;
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--white);
    padding: 0.75rem 2rem;
    display: block;
    text-align: center;
    opacity: 0;
    animation: menuLinkIn 0.45s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    transition: color var(--transition);
  }

  .header-nav.mobile-open a:hover { color: var(--yellow); }
}