/* ============================================
   origamel — single-page scrolling portfolio
   ============================================ */

:root {
  --black: #111;
  --white: #fff;
  --gray: #777;
  --light: #f5f5f5;
  --border: #e0e0e0;
  --font-sans: 'Inter', -apple-system, system-ui, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --page-pad: clamp(1.5rem, 4vw, 6rem);
  --nav-height: 5rem;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}

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

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

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem var(--page-pad);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: background 0.4s, backdrop-filter 0.4s;
}

.nav--hero {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.nav--hero.nav--scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav--hero .nav__logo,
.nav--hero .nav__links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.4s;
}

.nav--hero .nav__links a:hover,
.nav--hero .nav__logo:hover {
  color: var(--white);
}

.nav--hero.nav--scrolled .nav__logo,
.nav--hero.nav--scrolled .nav__links a {
  color: var(--gray);
}

.nav--hero.nav--scrolled .nav__links a:hover,
.nav--hero.nav--scrolled .nav__logo:hover {
  color: var(--black);
}

.nav--hero.nav--scrolled .nav__links a.active {
  color: var(--black);
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  gap: 2.5rem;
}

.nav__links a {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  transition: color 0.2s;
}

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

.nav__links a.active {
  color: var(--black);
}

.nav--hero .nav__links a.active {
  color: var(--white);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
  z-index: 101;
}

.nav__toggle span,
.nav__toggle span::before,
.nav__toggle span::after {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--black);
  position: absolute;
  left: 0;
  transition: all 0.3s;
}

.nav__toggle span { top: 50%; transform: translateY(-50%); }
.nav__toggle span::before { content: ''; top: -8px; }
.nav__toggle span::after { content: ''; top: 8px; }

.nav--hero .nav__toggle span,
.nav--hero .nav__toggle span::before,
.nav--hero .nav__toggle span::after {
  background: var(--white);
}

.nav--hero.nav--scrolled .nav__toggle span,
.nav--hero.nav--scrolled .nav__toggle span::before,
.nav--hero.nav--scrolled .nav__toggle span::after {
  background: var(--black);
}

.nav__toggle.open span { background: transparent; }
.nav__toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav__toggle.open span::after { top: 0; transform: rotate(-45deg); }

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 2fr;
  align-items: center;
  padding: var(--nav-height) var(--page-pad) 0;
  gap: 4rem;
}

.hero__text {
  padding: 2rem 0;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--black);
}

.hero__sub {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--gray);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__image {
  align-self: stretch;
  display: flex;
  align-items: center;
}

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

/* --- Sections (single-page) --- */
.section {
  padding: 8rem var(--page-pad);
  scroll-margin-top: var(--nav-height);
}

.section + .section {
  border-top: 1px solid var(--border);
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 3rem;
}

.section__intro {
  font-size: 1rem;
  color: var(--gray);
  margin-bottom: 4rem;
  max-width: 520px;
  line-height: 1.8;
}

/* --- Page (standalone inner pages) --- */
.page {
  padding: 10rem var(--page-pad) 6rem;
  flex: 1;
}

.page__title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 3rem;
}

.page__intro {
  font-size: 1rem;
  color: var(--gray);
  margin-bottom: 4rem;
  max-width: 520px;
  line-height: 1.8;
}

/* --- Work section (sticky sidebar + gallery) --- */
.section--work {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}

.work__sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 4rem);
}

.work__sidebar .section__title {
  margin-bottom: 0;
}

/* --- Gallery --- */
.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

.gallery__item {
  overflow: hidden;
  cursor: pointer;
}

.gallery__item img {
  width: 100%;
  display: block;
  transition: opacity 0.3s;
}

.gallery__item:hover img {
  opacity: 0.85;
}

/* --- About --- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

.about__content {
  max-width: 520px;
}

.about__content p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--gray);
  margin-bottom: 1rem;
}

.about__content p:last-child {
  margin-bottom: 0;
}

.about__image img {
  width: 100%;
}

/* --- Teaching --- */
.teaching__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

.teaching__content {
  max-width: 520px;
}

.teaching__content p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--gray);
  margin-bottom: 1rem;
}

.teaching__content p:last-child {
  margin-bottom: 0;
}

.teaching__content a {
  border-bottom: 1px solid var(--gray);
  padding-bottom: 1px;
  transition: color 0.2s, border-color 0.2s;
}

.teaching__content a:hover {
  color: var(--black);
  border-color: var(--black);
}

.teaching__image img {
  width: 100%;
}

/* --- Shop --- */
.shop__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
}

.shop__card img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.shop__info {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 1rem;
}

.shop__name {
  font-size: 0.85rem;
  font-weight: 400;
}

.shop__price {
  font-size: 0.85rem;
  font-weight: 500;
}

.shop__price.sold {
  color: var(--gray);
  text-decoration: line-through;
}

.shop__desc {
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--gray);
  margin-top: 0.5rem;
}

/* --- Contact --- */
.contact__links {
  display: flex;
  gap: 2rem;
}

.contact__links a {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--black);
  padding-bottom: 2px;
  transition: opacity 0.2s;
}

.contact__links a:hover {
  opacity: 0.6;
}

/* --- Footer --- */
.footer {
  padding: 6rem var(--page-pad) 3rem;
  border-top: 1px solid var(--border);
  scroll-margin-top: var(--nav-height);
}

.footer__contact {
  margin-bottom: 6rem;
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--gray);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox__img {
  max-width: 85vw;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox__close,
.lightbox__prev,
.lightbox__next {
  position: absolute;
  background: none;
  border: none;
  color: var(--black);
  cursor: pointer;
  font-size: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s;
}

.lightbox__close:hover,
.lightbox__prev:hover,
.lightbox__next:hover {
  background: var(--light);
}

.lightbox__close {
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.8rem;
}

.lightbox__prev {
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 2rem;
}

.lightbox__next {
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 2rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
  }

  .nav__links.open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__links a {
    font-size: 1rem;
    letter-spacing: 0.1em;
    color: var(--black);
  }

  .nav--hero .nav__links a {
    color: var(--black);
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: calc(var(--nav-height) + 2rem);
    gap: 2rem;
  }

  .hero__image {
    max-height: 60vh;
  }

  .section {
    padding: 5rem var(--page-pad);
  }

  .section--work {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .work__sidebar {
    position: static;
  }

  .gallery {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .about__grid,
  .teaching__grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .page {
    padding-top: 8rem;
    padding-bottom: 4rem;
  }

  .lightbox__prev { left: 0.5rem; }
  .lightbox__next { right: 0.5rem; }
}

@media (max-width: 480px) {
  .gallery {
    gap: 1rem;
  }

  .shop__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}