/* ==========================================================================
   components.css — Reusable UI atoms & molecules.
   Buttons, cards, chips, tags, modals, lightbox, forms, toast, timeline.
   ========================================================================== */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-violet), var(--accent-violet-strong));
  color: #0e0f1a;
  box-shadow: var(--shadow-sm), 0 0 0 0 rgba(169,155,255,0.4);
}
.btn-primary:hover {
  color: #0e0f1a;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md), 0 0 0 6px rgba(169,155,255,0.15);
}

.btn-secondary {
  background: var(--surface-glass);
  border-color: var(--border-strong);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}
.btn-secondary:hover {
  border-color: var(--accent-violet);
  color: var(--accent-violet);
  background: var(--bg-3);
}

.btn-ghost {
  padding: 10px 16px;
  color: var(--text-secondary);
  font-weight: 500;
}
.btn-ghost:hover { color: var(--accent-violet); background: var(--surface-glass); }

/* Arrow link */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--accent-violet);
  transition: gap var(--transition-fast);
}
.arrow-link:hover { gap: 10px; }
.arrow-link::after { content: "→"; transition: transform var(--transition-fast); }

/* ---------- Chip / Tag ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.02em;
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.chip:hover { color: var(--text-primary); border-color: var(--border-strong); }
.chip-accent {
  color: var(--accent-violet);
  border-color: rgba(169,155,255,0.3);
  background: rgba(169,155,255,0.08);
}
.chip-coral {
  color: var(--accent-coral);
  border-color: rgba(240,169,142,0.3);
  background: rgba(240,169,142,0.08);
}
.chip-teal {
  color: var(--accent-teal);
  border-color: rgba(122,215,198,0.3);
  background: rgba(122,215,198,0.08);
}

/* Filter buttons */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block: var(--space-5) var(--space-6);
  align-items: center;
}
.filter-btn {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}
.filter-btn:hover { color: var(--text-primary); border-color: var(--border-strong); }
.filter-btn.is-active {
  background: linear-gradient(135deg, var(--accent-violet), var(--accent-violet-strong));
  color: #0e0f1a;
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

/* Search input */
.search-input {
  flex: 1;
  min-width: 220px;
  max-width: 320px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  color: var(--text-primary);
  font-size: var(--fs-sm);
  transition: all var(--transition-fast);
}
.search-input::placeholder { color: var(--text-tertiary); }
.search-input:focus {
  border-color: var(--accent-violet);
  background: var(--bg-3);
}

/* ---------- Card ---------- */
.card {
  position: relative;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: all var(--transition-base);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-card-hover);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
  border-radius: inherit;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }

/* Project / content card specifics */
.project-card {
  display: flex;
  flex-direction: column;
  cursor: pointer;
}
.project-card__media {
  aspect-ratio: 16 / 10;
  margin: -1.5rem -1.5rem 1.25rem;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(169,155,255,0.14), rgba(240,169,142,0.1)),
    var(--bg-2);
  border-bottom: 1px solid var(--border-soft);
  position: relative;
}
.project-card__media img,
.project-card__media svg {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project-card:hover .project-card__media img,
.project-card:hover .project-card__media svg { transform: scale(1.05); }

.project-card__category {
  position: absolute; top: 12px; left: 12px;
  background: var(--surface-glass-strong);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  color: var(--accent-violet);
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1px solid var(--border-soft);
}

.project-card__title {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-2);
}
.project-card__desc {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  margin-bottom: var(--space-4);
  flex: 1;
}
.project-card__tags {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: var(--space-4);
}
.project-card__actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-soft);
}
.project-card__actions a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  font-weight: 500;
}
.project-card__actions a:hover { color: var(--accent-violet); }

/* Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}
.card-grid--wide { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }

/* Empty state */
.empty-state {
  padding: var(--space-7);
  text-align: center;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-strong);
  color: var(--text-tertiary);
}
.empty-state h4 { color: var(--text-secondary); margin-bottom: var(--space-2); }

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 10px; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-violet), var(--accent-coral), transparent);
  border-radius: 2px;
  opacity: 0.5;
}
.timeline-item { position: relative; padding-bottom: var(--space-6); }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -27px; top: 10px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 2px solid var(--accent-violet);
  box-shadow: 0 0 0 4px rgba(169,155,255,0.12);
}
.timeline-item__dates {
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-violet);
  font-weight: 600;
  margin-bottom: 4px;
}
.timeline-item h3 { font-size: var(--fs-lg); margin-bottom: 4px; }
.timeline-item .company {
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
  font-size: var(--fs-sm);
}
.timeline-item ul {
  list-style: disc;
  padding-left: 20px;
}
.timeline-item ul li {
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-size: 0.95rem;
}
.timeline-item ul li::marker { color: var(--accent-violet); }

/* ---------- Stats row ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.stat {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  text-align: center;
}
.stat__num {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 600;
  line-height: 1;
}
.stat__label {
  margin-top: 6px;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  z-index: 2000;
  padding: var(--space-5);
  align-items: center;
  justify-content: center;
}
.modal.is-open { display: flex; animation: fadeIn 0.25s ease; }
.modal__backdrop {
  position: absolute; inset: 0;
  background: rgba(10,11,20,0.78);
  backdrop-filter: blur(10px);
}
.modal__panel {
  position: relative;
  max-width: 820px;
  width: 100%;
  max-height: 86vh;
  overflow-y: auto;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--bg-1);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s cubic-bezier(.4,.0,.2,1);
}
.modal__close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--surface-glass);
  color: var(--text-primary);
  display: grid; place-items: center;
  z-index: 10;
}
.modal__close:hover { background: var(--bg-3); color: var(--accent-coral); }
.modal__meta {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: var(--space-3);
}
.modal__content h2 { margin-bottom: var(--space-3); }
.modal__content h4 {
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
  color: var(--accent-violet);
}
.modal__content p { margin-bottom: var(--space-3); }
.modal__content ul { padding-left: 20px; list-style: disc; }
.modal__content ul li { color: var(--text-secondary); margin-bottom: 4px; }
.modal__content ul li::marker { color: var(--accent-violet); }

/* ---------- Lightbox (for art + videos) ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  display: none;
  z-index: 2100;
  background: rgba(5,6,12,0.95);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
.lightbox.is-open { display: flex; animation: fadeIn 0.3s ease; }
.lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex; flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}
.lightbox__image {
  max-width: 100%;
  max-height: 76vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.lightbox__caption {
  text-align: center;
  color: var(--text-primary);
  max-width: 60ch;
}
.lightbox__caption h4 { color: var(--text-primary); margin-bottom: 4px; }
.lightbox__caption p { color: var(--text-secondary); font-size: var(--fs-sm); }
.lightbox__close,
.lightbox__prev,
.lightbox__next {
  position: absolute;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--surface-glass-strong);
  color: var(--text-primary);
  display: grid; place-items: center;
  border: 1px solid var(--border-strong);
  transition: all var(--transition-fast);
  z-index: 5;
}
.lightbox__close:hover,
.lightbox__prev:hover,
.lightbox__next:hover { background: var(--accent-violet); color: #0e0f1a; }
.lightbox__close { top: 20px; right: 20px; }
.lightbox__prev  { left: 20px; top: 50%; transform: translateY(-50%); }
.lightbox__next  { right: 20px; top: 50%; transform: translateY(-50%); }

/* ---------- Forms ---------- */
.form-grid { display: grid; gap: var(--space-4); }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  font-weight: 500;
}
.form-field input,
.form-field textarea {
  padding: 12px 14px;
  background: var(--bg-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--fs-base);
  transition: all var(--transition-fast);
  resize: vertical;
}
.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent-violet);
  background: var(--bg-2);
}
.form-field.has-error input,
.form-field.has-error textarea { border-color: var(--color-error); }
.form-error {
  font-size: var(--fs-xs);
  color: var(--color-error);
  margin-top: 2px;
  min-height: 1em;
}
.form-note {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(169,155,255,0.08);
  border: 1px solid rgba(169,155,255,0.25);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: var(--fs-sm);
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
  z-index: 2200;
}
.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Tabs ---------- */
.tabs { border-bottom: 1px solid var(--border-soft); display: flex; gap: var(--space-2); margin-bottom: var(--space-6); overflow-x: auto; }
.tab {
  padding: 10px 18px;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
  transition: all var(--transition-fast);
}
.tab:hover { color: var(--text-primary); }
.tab.is-active {
  color: var(--accent-violet);
  border-bottom-color: var(--accent-violet);
}
.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: fadeIn 0.3s ease; }

/* ---------- Research paper card ---------- */
.paper-card {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  margin-bottom: var(--space-4);
}
.paper-card__status {
  display: inline-block;
  font-size: var(--fs-xs);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}
.status-under-review { background: rgba(240,169,142,0.12); color: var(--accent-coral); border: 1px solid rgba(240,169,142,0.3); }
.status-published    { background: rgba(122,215,198,0.12); color: var(--accent-teal); border: 1px solid rgba(122,215,198,0.3); }
.status-in-progress  { background: rgba(169,155,255,0.12); color: var(--accent-violet); border: 1px solid rgba(169,155,255,0.3); }
.status-preprint     { background: rgba(230,197,133,0.12); color: var(--accent-gold); border: 1px solid rgba(230,197,133,0.3); }

.paper-card h3 { margin-top: var(--space-3); margin-bottom: var(--space-2); }
.paper-card__meta {
  display: flex; flex-wrap: wrap; gap: var(--space-3);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}
.paper-card__abstract {
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
  overflow: hidden;
  max-height: 4.8em;
  position: relative;
  transition: max-height var(--transition-slow);
}
.paper-card__abstract.is-expanded { max-height: 60em; }
.paper-card__expand {
  color: var(--accent-violet);
  font-size: var(--fs-sm);
  font-weight: 600;
  margin-top: var(--space-2);
}
.paper-card__links {
  display: flex; gap: var(--space-3);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

/* ---------- Blog card ---------- */
.blog-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-5);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-base);
}
.blog-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}
.blog-card__thumb {
  aspect-ratio: 4/3;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(135deg, rgba(169,155,255,0.18), rgba(240,169,142,0.14));
}
.blog-card__thumb img,
.blog-card__thumb svg { width: 100%; height: 100%; object-fit: cover; }
.blog-card__content { display: flex; flex-direction: column; justify-content: center; }
.blog-card__meta {
  display: flex; gap: var(--space-3);
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.blog-card h3 { font-size: var(--fs-xl); margin-bottom: 6px; }
.blog-card__excerpt { color: var(--text-secondary); font-size: var(--fs-sm); margin-bottom: var(--space-3); }

@media (max-width: 640px) {
  .blog-card { grid-template-columns: 1fr; }
  .blog-card__thumb { aspect-ratio: 16/9; }
}

/* ---------- Video card ---------- */
.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}
.video-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.video-card__thumb {
  aspect-ratio: 9/16;
  background: linear-gradient(135deg, rgba(169,155,255,0.2), rgba(240,169,142,0.14));
  position: relative;
  overflow: hidden;
}
.video-card__thumb img,
.video-card__thumb svg { width: 100%; height: 100%; object-fit: cover; }
.video-card__play {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  background: rgba(14,15,26,0.3);
  color: #fff;
  transition: all var(--transition-base);
}
.video-card:hover .video-card__play { background: rgba(14,15,26,0.5); }
.video-card__play svg { width: 48px; height: 48px; filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4)); }
.video-card__body { padding: var(--space-4); }
.video-card__body h4 { font-size: var(--fs-base); margin-bottom: 6px; }
.video-card__body p { font-size: var(--fs-sm); color: var(--text-secondary); margin-bottom: var(--space-2); }
.video-card__platform { font-size: var(--fs-xs); color: var(--accent-violet); letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600; }

/* ---------- Art tile (masonry) ---------- */
.masonry {
  columns: 3 280px;
  column-gap: var(--space-4);
}
.art-tile {
  break-inside: avoid;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: zoom-in;
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-base);
}
.art-tile:hover { transform: scale(1.015); border-color: var(--accent-violet); box-shadow: var(--shadow-md); }
.art-tile img,
.art-tile svg {
  width: 100%; height: auto; display: block;
  transition: transform var(--transition-slow);
}
.art-tile__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-5) var(--space-4) var(--space-3);
  background: linear-gradient(180deg, transparent, rgba(10,11,20,0.88));
  color: #fff;
  opacity: 0;
  transition: opacity var(--transition-base);
  font-size: var(--fs-sm);
}
.art-tile:hover .art-tile__caption { opacity: 1; }
.art-tile__caption strong { display: block; font-family: var(--font-display); font-weight: 500; font-size: var(--fs-base); color: #fff; }

/* ---------- Book card ---------- */
.book-card {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-base);
}
.book-card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow-sm); }
.book-card__cover {
  width: 110px;
  aspect-ratio: 2/3;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-3), var(--bg-2));
  box-shadow: var(--shadow-sm);
}
.book-card__cover img,
.book-card__cover svg { width: 100%; height: 100%; object-fit: cover; }
.book-card__body { display: flex; flex-direction: column; }
.book-card h4 { font-size: var(--fs-base); margin-bottom: 2px; }
.book-card .author { font-size: var(--fs-sm); color: var(--text-tertiary); margin-bottom: var(--space-2); font-style: italic; }
.book-card .rating { color: var(--accent-gold); font-size: var(--fs-sm); margin-bottom: var(--space-2); letter-spacing: 2px; }
.book-card .note { font-size: var(--fs-sm); color: var(--text-secondary); flex: 1; }
.book-card .genre {
  margin-top: var(--space-2);
  align-self: flex-start;
}

/* ---------- Volunteer card ---------- */
.volunteer-card {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  margin-bottom: var(--space-4);
  transition: all var(--transition-base);
}
.volunteer-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.volunteer-card__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.volunteer-card__dates {
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-teal);
}
.volunteer-card .org {
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
  font-size: var(--fs-sm);
}

/* ---------- Social icons row ---------- */
.social-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.social-row a {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--surface-glass);
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.social-row a:hover {
  color: var(--accent-violet);
  border-color: var(--accent-violet);
  transform: translateY(-3px);
}
.social-row svg { width: 18px; height: 18px; }