*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #282828;
  --color-accent: #7d7d7d;
  --color-border: #e5e5e5;
  --color-tag-bg: #f0f0f0;
  --font-sans: "Helvetica Neue", sans-serif;
  --font-display: "Helvetica Neue", sans-serif;
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ── Nav ── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__logo {
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav__links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.nav__links a:hover {
  color: var(--color-text);
}

/* ── Hero ── */

.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: var(--space-2xl) var(--space-md) var(--space-xl);
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.hero__label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  max-width: 900px;
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--color-text-secondary);
  max-width: 620px;
  line-height: 1.5;
}

/* ── Section ── */

.section {
  padding: var(--space-xl) var(--space-md);
}

.section--dark {
  background: var(--color-accent);
  color: #fff;
}

.section--dark .section__label,
.section--dark .section__subtitle {
  color: rgba(255, 255, 255, 0.6);
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-lg);
}

/* ── Work Grid ── */

.work-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.work-card {
  display: block;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.work-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.work-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #e5e5e5;
}

.work-card__body {
  padding: var(--space-md);
}

.work-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.work-card__tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  background: var(--color-tag-bg);
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.work-card__title {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.work-card__desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.work-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: var(--space-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  transition: gap 0.2s;
}

.work-card:hover .work-card__cta {
  gap: 0.7rem;
}

/* ── About ── */

.about-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: stretch;
}

.about__text p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.about__text p:first-child {
  color: var(--color-text);
  font-size: 1.15rem;
}

.experience-list {
  list-style: none;
  margin-top: 0;
}

.experience-list li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.experience-list__row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.experience-list__row--head {
  flex-direction: row;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.experience-list__role {
  font-weight: 500;
  font-size: 0.95rem;
}

.experience-list__company {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.experience-list__team {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
}

.experience-list__dates {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* ── Footer ── */

.footer {
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.footer__links a:hover {
  color: var(--color-text);
}

/* ── Case Study Page ── */

.case-hero {
  padding: calc(var(--space-2xl) + 2rem) var(--space-md) var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.case-hero__back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  transition: color 0.2s, gap 0.2s;
}

.case-hero__back:hover {
  color: var(--color-text);
  gap: 0.6rem;
}

.case-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.case-hero__tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  background: var(--color-tag-bg);
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.case-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.case-hero__subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 650px;
  line-height: 1.5;
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.case-meta__item {
  font-size: 0.85rem;
}

.case-meta__label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.case-meta__value {
  font-weight: 500;
}

/* ── Case Study Content ── */

.case-content {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.case-content h2 {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.case-content h2:first-child {
  margin-top: 0;
}

.case-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

.case-content p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.case-content ul {
  margin-bottom: var(--space-md);
  padding-left: 1.2rem;
}

.case-content li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 0.4rem;
}

.case-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  font-size: 1.3rem;
  font-style: italic;
  line-height: 1.5;
  color: var(--color-text);
}

/* ── Full-width Image ── */

.case-image {
  max-width: var(--max-width);
  margin: var(--space-lg) auto;
  padding: 0 var(--space-md);
}

.case-image img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.case-image figcaption {
  margin-top: var(--space-xs);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  text-align: center;
}

.case-image-grid {
  max-width: var(--max-width);
  margin: var(--space-lg) auto;
  padding: 0 var(--space-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.case-image-grid img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

/* ── Responsive ── */

@media (min-width: 768px) {
  .work-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .about-layout .about__text,
  .about-layout .about__experience {
    flex: 1;
    min-width: 0;
  }
}

@media (max-width: 767px) {
  .nav__links {
    gap: var(--space-sm);
  }

  .case-image-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 70vh;
  }
}

/* ── Fade-in animation ── */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}