/* ==========================================================================
   Minimalist Academic Components - Dr. Akash Sondhi
   ========================================================================== */

/* Header / Navbar */
.site-header {
  background-color: var(--header-bg);
  color: var(--header-text);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-brand {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 500;
  color: #ffffff;
  letter-spacing: 0.01em;
}

.site-brand:hover {
  color: var(--header-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 400;
  color: var(--header-muted);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Banner Area */
.hero-banner {
  position: relative;
  width: 100%;
  height: 340px;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
}

.hero-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(20, 14, 10, 0.45), rgba(20, 14, 10, 0.7));
  display: flex;
  align-items: center;
}

.hero-banner-content {
  display: flex;
  justify-content: flex-end;
  width: 100%;
}

.hero-text-block {
  max-width: 580px;
  color: #ffffff;
  padding-left: 20px;
}

.hero-title {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.15;
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.9);
  font-family: var(--font-heading);
  letter-spacing: 0.02em;
}

.hero-affiliation {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 4px;
}

/* Overlapping Intro Section (Matches Reference) */
.intro-overlap-section {
  position: relative;
  background-color: var(--bg-surface);
  padding-bottom: 70px;
  border-bottom: 1px solid var(--border-light);
}

.intro-overlap-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 50px;
  position: relative;
}

.portrait-wrapper {
  position: relative;
  margin-top: -140px; /* Overlaps hero banner exactly like reference image */
  z-index: 10;
}

.portrait-img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  object-position: center 30%;
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15);
  background-color: #eae5df;
}

.portrait-caption {
  margin-top: 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.intro-text-column {
  padding-top: 36px;
}

.intro-lead-paragraph {
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text-main);
  margin-bottom: 22px;
}

.intro-summary-bullets {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.bullet-item {
  display: flex;
  flex-direction: column;
}

.bullet-number {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-warm);
}

.bullet-label {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* Minimalist Content Sections */
.content-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-light);
}

.content-section:nth-child(even) {
  background-color: var(--bg-page);
}

.content-section:nth-child(odd) {
  background-color: var(--bg-surface);
}

.section-head {
  margin-bottom: 40px;
  max-width: 720px;
}

.section-label {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--accent-warm);
  margin-bottom: 8px;
  display: block;
}

.section-heading {
  font-size: 2rem;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Clean Editorial Lists & Grids */
.academic-list {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.academic-item {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.academic-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.item-meta {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-warm);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.item-title {
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.item-venue {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 8px;
}

.item-detail {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* Minimal 3-Column Grid for Build / Mentors */
.clean-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.clean-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 30px;
  transition: var(--transition);
}

.clean-card:hover {
  border-color: var(--accent-warm);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.04);
}

.clean-card-num {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-warm);
  margin-bottom: 14px;
  display: block;
}

.clean-card-title {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.clean-card-desc {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* Minimalist Tabs/Filter for Discover */
.filter-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.filter-tab-btn {
  background: none;
  border: 1px solid var(--border-light);
  padding: 7px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.filter-tab-btn:hover {
  border-color: var(--accent-warm);
  color: var(--text-main);
}

.filter-tab-btn.active {
  background-color: var(--header-bg);
  color: #ffffff;
  border-color: var(--header-bg);
}

/* Quiet Minimalist Fun Quiz */
.minimal-quiz-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 36px;
  max-width: 760px;
}

.quiz-option-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.quiz-simple-btn {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  text-align: left;
  font-size: 0.95rem;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
}

.quiz-simple-btn:hover {
  border-color: var(--accent-warm);
  background-color: #faf6f0;
}

/* Minimalist Contact Form */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}

.minimal-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-field label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
}

.minimal-input,
.minimal-textarea,
.minimal-select {
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: var(--transition);
}

.minimal-input:focus,
.minimal-textarea:focus,
.minimal-select:focus {
  outline: none;
  border-color: var(--accent-warm);
}

.minimal-textarea {
  min-height: 120px;
  resize: vertical;
}

.btn-minimal {
  display: inline-block;
  background-color: var(--header-bg);
  color: #ffffff;
  padding: 12px 28px;
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  align-self: flex-start;
}

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

/* Contact Details Column */
.contact-details-box {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 30px;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.contact-line h4 {
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 4px;
}

.contact-line p {
  font-size: 0.9rem;
  color: var(--text-body);
  margin-bottom: 0;
}

/* Minimal Footer */
.site-footer {
  background-color: var(--header-bg);
  color: var(--header-muted);
  padding: 40px 0;
  font-size: 0.88rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-nav {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-nav a {
  color: var(--header-muted);
}

.footer-nav a:hover {
  color: #ffffff;
}

/* Toast Notice */
.minimal-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--header-bg);
  color: #ffffff;
  padding: 14px 22px;
  border-radius: var(--radius-sm);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
  font-size: 0.9rem;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 2000;
  border-left: 4px solid var(--accent-warm);
}

.minimal-toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
  .intro-overlap-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .portrait-wrapper {
    margin-top: -90px;
    max-width: 280px;
  }

  .clean-grid-3 {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero-banner {
    height: 280px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .mobile-toggle {
    display: block;
  }
}