/* ==========================================================================
   Yiklam Studio — projects.css
   Projects page ("Portfolio Showcase") layout only.

   Scope:
   - page header / category navigation
   - featured project cards (large)
   - supporting tool cards (medium)
   - ESL classroom-lab horizontal marquee
   - end-section cards (YILIN OS · Community Commerce)
   - The Speech product-system value module
   - lightbox

   Shared styles (nav, footer, buttons, tags) live in global.css.
   ========================================================================== */

/* ---------- Page header ---------- */
.page-header {
  padding: 56px 0 40px;
  text-align: center;
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 62px);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: var(--text);
}

.page-eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--accent2);
  margin-bottom: 14px;
}

.page-header p {
  font-size: 18px;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Category navigation ---------- */
.category-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 0 20px;
  position: sticky;
  top: 75px;
  z-index: 80;
  background: rgba(253, 249, 244, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  margin-bottom: 24px;
}

.cat-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 8px 16px;
  border-radius: 40px;
  text-decoration: none;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.cat-pill:hover,
.cat-pill.active {
  background: var(--surface);
  color: var(--accent);
  border-color: var(--accent);
}

/* ---------- Generic section ---------- */
section {
  padding: 48px 0 56px;
  scroll-margin-top: 150px;
}

.section-label-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent2);
  letter-spacing: 1px;
}

.section-category {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--muted2);
  font-weight: 500;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text);
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--muted);
  margin-bottom: 28px;
  max-width: 640px;
}

/* ---------- Featured project cards (large) ---------- */
.project-featured {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px;
  margin-bottom: 36px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  scroll-margin-top: 140px;
}

.project-featured:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.project-featured-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 48px;
  align-items: center;
}

.project-featured-grid.reversed {
  grid-template-columns: 1fr 1.25fr;
}

.project-visual {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--surface-warm);
  aspect-ratio: 16 / 10;
}

.project-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.project-featured:hover .project-visual img {
  transform: scale(1.03);
}

.project-content {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.project-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.project-number {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent2);
  letter-spacing: 1px;
}

.project-cat {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted2);
}

.project-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text);
  line-height: 1.15;
}

.project-tagline {
  font-size: 17px;
  color: var(--accent);
  font-weight: 500;
  line-height: 1.4;
}

.project-desc {
  font-size: 15.5px;
  color: var(--muted);
  line-height: 1.6;
}

.tool-list,
.highlight-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.tool-tag,
.highlight-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  padding: 5px 11px;
  border-radius: 40px;
  letter-spacing: 0.2px;
}

.tool-tag {
  background: var(--tag-bg2);
  color: var(--accent);
}

.highlight-tag {
  background: var(--tag-bg);
  color: var(--accent2);
}

.project-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.link-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted2);
  max-width: 260px;
  line-height: 1.4;
}

/* ---------- Product-system value module (The Speech) ---------- */
.product-value {
  margin-top: 6px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.product-value-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted2);
  margin-bottom: 4px;
}

.product-value-label strong {
  color: var(--accent);
}

.value-roles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.value-role {
  background: var(--surface-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.value-role-name {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--accent);
  margin-bottom: 6px;
}

.value-role ul {
  list-style: none;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.value-role ul li::before {
  content: '·';
  color: var(--accent2);
  font-weight: 700;
  margin-right: 6px;
}

/* ---------- Supporting tool cards (medium) ---------- */
.section-supporting {
  padding: 56px 0;
  scroll-margin-top: 140px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.tool-visual {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--surface-warm);
  border-bottom: 1px solid var(--border);
}

.tool-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.tool-card:hover .tool-visual img {
  transform: scale(1.04);
}

.tool-content {
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.tool-content h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

.tool-content p {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.55;
  flex: 1;
}

.tool-tags {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--tag-bg2);
  padding: 6px 12px;
  border-radius: 40px;
  display: inline-block;
  width: fit-content;
}

.tool-content .btn {
  margin-top: 8px;
  width: fit-content;
}

/* ---------- ESL Classroom Lab marquee ---------- */
.section-marquee {
  padding: 56px 0 64px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 32px 0;
  scroll-margin-top: 140px;
}

.marquee-header {
  text-align: center;
  margin-bottom: 28px;
}

.marquee-header .section-title { margin-bottom: 6px; }

.marquee-header .section-subtitle {
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.marquee-wrapper {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 12px;
  cursor: grab;
  scroll-behavior: smooth;
}

.marquee-wrapper::-webkit-scrollbar { height: 6px; }
.marquee-wrapper::-webkit-scrollbar-track { background: var(--border); border-radius: 10px; }
.marquee-wrapper::-webkit-scrollbar-thumb { background: var(--accent2); border-radius: 10px; }

.marquee-track {
  display: flex;
  gap: 18px;
  width: max-content;
  padding: 4px 4px 8px;
}

.marquee-item {
  flex: 0 0 auto;
  width: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
}

.marquee-item:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: var(--shadow-hover);
}

.marquee-thumb {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.marquee-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.marquee-item:hover .marquee-thumb img {
  transform: scale(1.05);
}

.marquee-info {
  padding: 14px;
}

.marquee-cat {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent2);
  margin-bottom: 4px;
}

.marquee-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.marquee-hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted2);
  margin-top: 16px;
  letter-spacing: 0.5px;
}

/* ---------- End-section cards (YILIN OS · Community Commerce) ---------- */
.section-final {
  padding: 56px 0 80px;
  scroll-margin-top: 140px;
}

.final-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.project-final-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  scroll-margin-top: 140px;
}

.project-final-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.final-visual {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.final-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.project-final-card:hover .final-visual img {
  transform: scale(1.04);
}

.final-content {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.final-content h3 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
}

.final-content .project-tagline { font-size: 15.5px; }
.final-content .project-desc { font-size: 14.5px; flex: 1; }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(31, 42, 42, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px;
  cursor: zoom-out;
}

.lightbox.active { display: flex; }

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius-sm);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
  object-fit: contain;
  cursor: default;
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 30px;
  color: #fff;
  font-size: 32px;
  font-family: sans-serif;
  cursor: pointer;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.lightbox-close:hover { opacity: 1; }

/* ---------- Anchor offset helper ---------- */
.section-anchor {
  position: relative;
  top: -130px;
  display: block;
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .project-featured-grid,
  .project-featured-grid.reversed {
    grid-template-columns: 1fr;
  }
  .project-featured { padding: 30px; }
  .tools-grid,
  .final-grid { grid-template-columns: 1fr; }
  .category-nav { gap: 8px; top: 70px; }
  .cat-pill { padding: 7px 12px; font-size: 11px; }
  .value-roles { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .page-header { padding: 36px 0 28px; }
  .page-header p { font-size: 16px; }
  .category-nav {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 10px;
    padding-bottom: 16px;
    scrollbar-width: none;
  }
  .category-nav::-webkit-scrollbar { display: none; }
  .project-featured { padding: 22px; }
  .project-content { gap: 10px; }
  .project-actions { gap: 10px; }
  .link-note { width: 100%; max-width: none; margin-top: 4px; }
  .marquee-item { width: 180px; }
  .tool-content { padding: 20px; }
  .final-content { padding: 22px; }
}