/* =========================================
   SPECTRE Website – Responsive & Animations
   =========================================
   This file adds:
   1. Tablet breakpoint (1024px)
   2. Enhanced 768px breakpoint additions
   3. Small phone breakpoint (480px)
   4. CSS animations & transitions
   5. Reduced-motion preferences
   ========================================= */

/* =========================================
   1. CSS ANIMATIONS & TRANSITIONS
   ========================================= */

/* --- Hero Gradient Glow --- */
.hero__gradient {
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% {
    opacity: 0.5;
    transform: scale(1);
  }
  100% {
    opacity: 1;
    transform: scale(1.1);
  }
}

/* --- Scroll Reveal (fade-in-up) ---
   Sections themselves stay opaque (so their background fills the gap
   between hero and content). Only the inner container fades + slides in. */
.reveal {
  opacity: 1;
}

.reveal > .container {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease-out, transform 0.55s ease-out;
}

.reveal.is-visible > .container {
  opacity: 1;
  transform: translateY(0);
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .reveal > .container {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --- Staggered Card Entrance --- */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 0.4s; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 0.5s; }
.reveal-stagger.is-visible > *:nth-child(7) { transition-delay: 0.6s; }
.reveal-stagger.is-visible > *:nth-child(8) { transition-delay: 0.7s; }

/* --- Card Hover Lift Effect (enhanced) --- */
.research-card,
.team-card,
.course-card,
.lab-card,
.guide-card,
.impact-card,
.position-card,
.publication-slide,
.semester-box,
.labs-intro__card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.research-card:hover,
.team-card:hover,
.course-card:hover,
.lab-card:hover,
.guide-card:hover,
.impact-card:hover,
.publication-slide:hover,
.labs-intro__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

.research-card:hover {
  transform: translateY(-4px) scale(1.02);
}

/* --- Timeline Scroll Animation --- */
.timeline__item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline__item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Method Modal Entrance --- */
dialog.method-modal[open] {
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

dialog.method-modal::backdrop {
  animation: backdropIn 0.3s ease;
}

@keyframes backdropIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --- Button Hover Animations --- */
.btn {
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease,
              transform 0.15s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.2);
}

.btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

/* --- Nav Link Underline Animation --- */
.site-nav__link {
  position: relative;
  border-bottom: none;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.site-nav__link:hover::after,
.site-nav__link.is-active::after {
  width: 100%;
}

/* --- News Item Toggle Smooth Expand --- */
.news-item__body {
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
}

/* --- Social Link Hover --- */
.social-link,
.social-icon__circle {
  transition: background 0.2s ease, border-color 0.2s ease,
              color 0.2s ease, transform 0.2s ease;
}

.social-link:hover,
.social-icon:hover .social-icon__circle {
  transform: scale(1.1);
}

/* --- Tag Hover --- */
.tag {
  transition: background 0.2s ease, color 0.2s ease;
}

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

/* --- FAQ Accordion Smooth --- */
.faq-item__answer {
  overflow: hidden;
  transition: max-height 0.3s ease, padding-bottom 0.3s ease;
}


/* =========================================
   2. TABLET BREAKPOINT (1024px)
   ========================================= */
@media (max-width: 1024px) {

  /* Navigation: reduce spacing */
  .site-nav__list {
    gap: 1.25rem;
  }

  .site-nav__link {
    font-size: var(--fs-body);
  }

  /* Hero: reduce padding */
  .hero {
    padding: clamp(3rem, 8vw, 6rem) 0;
  }

  .hero--home {
    padding: clamp(4rem, 10vw, 8rem) 0;
  }

  /* Grids: 2-column layouts */
  .research-topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .labs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .positions-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Carousel: show 2 per view */
  .labs-carousel__track > *,
  .publications-carousel__track > * {
    flex: 0 0 calc(50% - 0.75rem);
  }

  /* Lab Detail: stack columns */
  .lab-detail__layout {
    grid-template-columns: 1fr;
  }

  .lab-detail__sidebar {
    order: -1;
  }

  /* Area Detail: stack columns */
  .area-detail__columns {
    grid-template-columns: 1fr;
  }

  /* Publications table: horizontal scroll, smaller font */
  .pub-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .pub-table {
    font-size: var(--fs-small);
    min-width: 600px;
  }

  .pub-table th,
  .pub-table td {
    padding: 0.6rem 0.75rem;
  }

  /* Footer: 2-column */
  .site-footer__inner {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Semester guide boxes */
  .semester-guide__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Impact stories */
  .impact-stories__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Labs intro */
  .labs-intro__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* =========================================
   3. ENHANCED 768px BREAKPOINT
   ========================================= */
@media (max-width: 768px) {

  /* Wave divider smaller on mobile */
  .wave-divider {
    height: 40px;
  }

  /* News grid single column on mobile */
  .news-grid {
    grid-template-columns: 1fr;
  }

  /* Labs carousel single slide */
  .labs-carousel__slide {
    flex: 0 0 calc(100% - 1rem);
  }

  /* Research cards: 2 columns on tablets, handled via min-width */
  .research-topics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  /* Course cards: single column */
  .course-grid {
    grid-template-columns: 1fr;
  }

  /* Team grid: 2 columns */
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .team-grid--small {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Area detail columns: stack vertically */
  .area-detail__columns {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .area-detail__methods {
    flex-wrap: wrap;
  }

  /* Semester guide boxes: stack */
  .semester-guide__grid {
    grid-template-columns: 1fr;
  }

  /* Impact stories grid: stack */
  .impact-stories__grid {
    grid-template-columns: 1fr;
  }

  /* Labs intro grid: stack */
  .labs-intro__grid {
    grid-template-columns: 1fr;
  }

  /* Labs grid: single column */
  .labs-grid {
    grid-template-columns: 1fr;
  }

  /* Position cards: stack */
  .positions-grid {
    grid-template-columns: 1fr;
  }

  /* Lab detail: stack everything */
  .lab-detail__layout {
    grid-template-columns: 1fr;
  }

  /* Method modal: full-width */
  .method-modal {
    width: calc(100% - 2rem);
    max-width: none;
    margin: 1rem;
  }

  .method-modal__inner {
    max-height: calc(100vh - 4rem);
  }

  /* Carousel: single item */
  .labs-carousel__track > *,
  .publications-carousel__track > * {
    flex: 0 0 calc(100% - 1rem);
  }

  /* Carousel buttons: tighter */
  .carousel-btn--prev {
    left: -10px;
  }

  .carousel-btn--next {
    right: -10px;
  }

  /* Publications table */
  .pub-table {
    font-size: var(--fs-small);
    min-width: 500px;
  }

  /* Footer: single column */
  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  /* Profile hero: stack */
  .hero--profile .hero__content--profile {
    flex-direction: column-reverse;
    text-align: center;
  }

  .profile-hero__portrait img {
    width: 150px;
    height: 150px;
  }

  /* Teaching teaser */
  .teaching-teaser {
    padding: 2rem;
  }

  /* Container */
  .container {
    padding: 0 1rem;
  }

  /* Nav underline animation: disable on mobile nav */
  .site-nav__link::after {
    display: none;
  }

  /* Reset nav link border for mobile menu */
  .site-nav__link:hover,
  .site-nav__link.is-active {
    border-bottom-color: transparent;
  }

  /* Course meta: stack */
  .course-meta {
    flex-direction: column;
    gap: 0.5rem;
  }
}


/* =========================================
   4. SMALL PHONE BREAKPOINT (480px)
   ========================================= */
@media (max-width: 480px) {

  /* Reduce section padding */
  .section {
    padding: clamp(2rem, 4vw, 3rem) 0;
  }

  /* Smaller hero titles */
  .hero__title {
    font-size: var(--fs-h2);
  }

  .hero__subtitle {
    font-size: var(--fs-body);
  }

  .hero {
    padding: clamp(2.5rem, 6vw, 4rem) 0;
  }

  .hero--home {
    padding: clamp(3rem, 8vw, 5rem) 0;
  }

  /* Section title smaller */
  .section__title {
    font-size: var(--fs-h2);
  }

  /* Single column everything */
  .research-topics-grid {
    grid-template-columns: 1fr;
  }

  .team-grid,
  .team-grid--small {
    grid-template-columns: 1fr;
  }

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

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

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

  .semester-guide__grid {
    grid-template-columns: 1fr;
  }

  .impact-stories__grid {
    grid-template-columns: 1fr;
  }

  .labs-intro__grid {
    grid-template-columns: 1fr;
  }

  /* Reduce card padding */
  .research-card {
    padding: 1.5rem;
  }

  .course-card {
    padding: 1.25rem;
  }

  .position-card {
    padding: 1.5rem;
  }

  .semester-box {
    padding: 1.25rem;
  }

  .impact-card {
    padding: 1.25rem;
  }

  /* Stack all cards vertically */
  .course-card__header {
    flex-direction: column;
    gap: 0.5rem;
  }

  /* Smaller team portraits */
  .team-card__portrait img,
  .team-card__placeholder {
    width: 100px;
    height: 100px;
  }

  /* Profile hero portrait */
  .profile-hero__portrait img {
    width: 120px;
    height: 120px;
  }

  /* News items */
  .news-item {
    padding: 1.25rem 0;
  }

  .news-item__title {
    font-size: var(--fs-body);
  }

  .news-item__excerpt {
    font-size: var(--fs-body);
  }

  .news-item__links {
    flex-direction: column;
  }

  /* Buttons: full-width on small screens */
  .hero .btn {
    display: flex;
    justify-content: center;
    width: 100%;
  }

  /* Method modal */
  .method-modal {
    width: calc(100% - 1rem);
    margin: 0.5rem;
  }

  /* Container padding */
  .container {
    padding: 0 0.75rem;
  }

  /* Timeline */
  .timeline__item {
    flex: none;
    padding-left: 1.5rem;
  }

  /* FAQ */
  .faq-item__question {
    font-size: var(--fs-body);
    padding: 1rem 0;
  }

  /* Pagination */
  .pagination__link {
    width: 36px;
    height: 36px;
    font-size: var(--fs-body);
  }

  /* Publication slide cover */
  .publication-slide__cover {
    height: 140px;
  }

  /* Teaching teaser */
  .teaching-teaser {
    padding: 1.5rem;
  }

  /* Intro text */
  .intro-text {
    font-size: var(--fs-body);
    line-height: 1.7;
  }

  /* Footer */
  .site-footer {
    padding: 2rem 0 1rem;
  }

  .site-footer__col {
    font-size: var(--fs-small);
  }

  .site-footer__copy {
    font-size: var(--fs-small);
  }
}


/* =========================================
   5. REDUCED MOTION PREFERENCE
   ========================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .reveal-stagger > * {
    opacity: 1;
    transform: none;
  }

  .timeline__item {
    opacity: 1;
    transform: none;
  }
}