/*
  Page-specific layout: hero, about, project detail, contact, blog article, certificates grid.
*/

/* ---------- Hero (index.html) ---------- */
.hero {
  position: relative;
  padding-top: var(--space-10);
  padding-bottom: var(--space-9);
  overflow: hidden;
}

/* Very subtle depth: a soft radial glow sitting behind the headline, the
   same trick Apple product pages use for "lit from above" hero lighting.
   Kept faint on purpose — dimension, not decoration. */
.hero::before {
  content: "";
  position: absolute;
  top: -220px;
  left: 50%;
  width: 900px;
  height: 560px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(17, 17, 17, 0.05), transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
}

.hero__eyebrow-wrap {
  height: 1.2em;
  overflow: hidden;
  margin-bottom: var(--space-5);
}

/* Signature element: role text cross-fades — the one deliberately dynamic
   moment on the page. Everything else stays quiet by comparison. */
.role-rotator {
  position: relative;
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.role-rotator__word {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--duration-slow) var(--ease-standard),
    transform var(--duration-slow) var(--ease-standard);
  white-space: nowrap;
}

.role-rotator__word.is-active {
  position: relative;
  opacity: 1;
  transform: none;
}

.hero__title {
  max-width: 820px;
}

.hero__desc {
  margin-top: var(--space-5);
  max-width: 560px;
  font-size: var(--fs-body-lg);
}

.hero__actions {
  margin-top: var(--space-7);
}

/* ---------- Generic page header (Projects / Research / Experience / Certificates / Blog) ---------- */
.page-hero {
  position: relative;
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -260px;
  left: 15%;
  width: 640px;
  height: 480px;
  background: radial-gradient(closest-side, rgba(17, 17, 17, 0.04), transparent 70%);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
}

.page-hero h1 {
  margin-top: var(--space-3);
}

.page-hero p {
  margin-top: var(--space-4);
  max-width: 560px;
  font-size: var(--fs-body-lg);
}

/* ---------- Section: featured lists on home ---------- */
.section-alt {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* ---------- About page ---------- */
.about-hero {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
}

.about-hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-8);
  align-items: start;
}

.about-hero p + p {
  margin-top: var(--space-4);
}

.about-hero h1 {
  margin-top: var(--space-3);
}

.about-hero__lead {
  margin-top: var(--space-5);
  font-size: var(--fs-body-lg);
}

.link-accent {
  color: var(--color-accent);
}

.about-hero__portrait {
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #f6f6f7 0%, #ececee 55%, #e2e2e5 100%);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-5);
}

.about-hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-hero__facts {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--color-card);
  box-shadow: var(--shadow-sm);
}

.fact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.fact {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--fs-small);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

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

.fact dt {
  color: var(--color-secondary);
}

.fact dd {
  color: var(--color-primary);
  font-weight: 500;
  text-align: right;
}

/* ---------- Project detail page ---------- */
.project-hero {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.project-hero__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-small);
  color: var(--color-secondary);
  margin-bottom: var(--space-6);
}

.project-hero__back:hover {
  color: var(--color-accent);
}

.project-hero__back svg {
  width: 16px;
  height: 16px;
}

.project-hero__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.project-hero__title {
  margin-top: var(--space-2);
}

.project-hero__desc {
  margin-top: var(--space-4);
  max-width: 680px;
  font-size: var(--fs-body-lg);
}

.project-cover {
  margin-top: var(--space-7);
  aspect-ratio: 16 / 8;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #f4f4f5, #e9e9ec);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.project-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-body {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-9);
  align-items: start;
}

.project-content section + section {
  margin-top: var(--space-8);
}

.project-content h2 {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-4);
}

.project-content p {
  max-width: 68ch;
}

.project-content p + p {
  margin-top: var(--space-3);
}

.project-content ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.project-content li {
  position: relative;
  padding-left: var(--space-5);
  max-width: 68ch;
}

.project-content li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.screenshot-grid img,
.screenshot-grid .card__media-fallback {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.screenshot-grid .card__media {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  aspect-ratio: 4 / 3;
}

.project-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-6));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--color-card);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.project-sidebar__group h4 {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-secondary);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.project-sidebar__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.project-sidebar .btn {
  width: 100%;
  justify-content: center;
}

/* ---------- Certificates grid ---------- */
.certificate-card {
  cursor: pointer;
  text-align: left;
  width: 100%;
}

/* ---------- Contact page ---------- */
.contact-hero {
  text-align: center;
  padding-top: var(--space-9);
  padding-bottom: var(--space-8);
}

.contact-hero__title {
  max-width: 640px;
  margin-inline: auto;
}

.contact-hero p {
  max-width: 520px;
  margin: var(--space-4) auto 0;
  font-size: var(--fs-body-lg);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-card);
  transition: transform var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard);
}

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

.contact-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-card__icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
}

.contact-card__label {
  font-size: var(--fs-small);
  color: var(--color-secondary);
}

.contact-card__value {
  font-family: var(--font-mono);
  font-size: var(--fs-body);
  color: var(--color-primary);
  word-break: break-word;
}

/* ---------- Blog article ---------- */
.article-hero {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.article-hero h1 {
  margin-top: var(--space-3);
}

.article-hero__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-secondary);
}

.article-body {
  max-width: 68ch;
  margin-inline: auto;
  font-size: var(--fs-body-lg);
}

.article-body h2 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  font-size: var(--fs-h2);
}

.article-body p + p,
.article-body p + ul,
.article-body ul + p {
  margin-top: var(--space-4);
}

.article-body ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-left: var(--space-5);
}

.article-body li {
  list-style: disc;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-accent-soft);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

/* ---------- Empty state (used when a data-driven section has no items) ---------- */
.empty-state {
  padding: var(--space-8) 0;
  text-align: center;
  color: var(--color-secondary);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
}