/* ==========================================================================
   CAVAS 2.0 — DESIGN SYSTEM
   Premium minimalist / editorial. Portfolio-first. Restraint over decoration.
   ========================================================================== */

/* ---- Design tokens (Brief §3.4–§3.11) ---------------------------------- */
:root {
  --bg-primary:      #0F1115;
  --bg-secondary:    #171A20;
  --surface:         #20242C;
  --text-primary:    #F5F5F3;
  --text-secondary:  #B5BAC4;
  --accent:          #C9A96A;
  --accent-ink:      #16181C; /* dark text on accent surfaces */
  --divider:         rgba(255,255,255,0.08);

  --font-heading: 'Manrope', sans-serif;
  --font-body:    'Inter', sans-serif;

  /* 8-point spacing scale */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-6: 48px;
  --sp-8: 64px;
  --sp-12: 96px;
  --sp-16: 128px;

  --radius-card:   14px;
  --radius-button: 12px;
  --radius-image:  14px;
  --radius-input:  10px;

  --content-max: 1360px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-med:  250ms;
}

/* ---- Reset -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overscroll-behavior-y: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul { list-style: none; }

/* ---- Utility ------------------------------------------------------------ */
.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--sp-4);
}

.eyebrow {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: var(--sp-2);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-button);
  font-family: var(--font-heading);
  font-weight: 600;
  z-index: 200;
}
.skip-link:focus {
  left: var(--sp-2);
  top: var(--sp-2);
}

/* Visible keyboard focus everywhere (Brief §5.18, §6.8) */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Typography scale (Brief §3.5) -------------------------------------- */
h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--text-primary); line-height: 1.15; }
h1 { font-size: clamp(40px, 6vw, 72px); font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: clamp(30px, 4vw, 44px); font-weight: 600; letter-spacing: -0.01em; }
h3 { font-size: clamp(20px, 2.4vw, 26px); font-weight: 500; }
p  { color: var(--text-secondary); }
.caption { font-size: 15px; color: var(--text-secondary); }

/* ---- Header / Navigation (Brief §5.4) ----------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--divider);
  transition: padding var(--dur-med) var(--ease-out);
}
/* Blur lives on a pseudo-element, not on .site-header itself — a
   backdrop-filter on .site-header would otherwise become the containing
   block for any position:fixed descendant (e.g. the mobile nav overlay),
   breaking its full-viewport coverage. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(15,17,21,0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding-block: var(--sp-3);
}
.site-header.is-scrolled .container { padding-block: var(--sp-2); }

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.06em;
  text-decoration: none;
}

.primary-nav { display: flex; align-items: center; gap: var(--sp-4); }
.primary-nav ul { display: flex; gap: var(--sp-3); }
.primary-nav a {
  font-size: 14px;
  text-decoration: none;
  color: var(--text-secondary);
  padding: var(--sp-1) 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.primary-nav a:hover,
.primary-nav a:focus-visible { color: var(--text-primary); border-color: var(--accent); }

.nav-toggle {
  display: none;
  min-width: 44px; min-height: 44px;
  align-items: center; justify-content: center;
}

.lang-switch {
  display: flex;
  border: 1px solid var(--divider);
  border-radius: var(--radius-button);
  overflow: hidden;
}
.lang-switch button {
  padding: var(--sp-1) var(--sp-2);
  min-width: 44px; min-height: 40px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: background var(--dur-fast) ease, color var(--dur-fast) ease;
}
.lang-switch button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.lang-switch button:hover:not([aria-pressed="true"]) { color: var(--text-primary); }

/* ---- Buttons (Brief §3.11) ----------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  min-height: 48px;
  padding: 0 var(--sp-4);
  border-radius: var(--radius-button);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-fast) ease, opacity var(--dur-fast) ease;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { transform: translateY(-2px); opacity: 0.92; }
.btn-secondary { background: transparent; border: 1px solid var(--divider); color: var(--text-primary); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-text { color: var(--accent); min-height: 44px; padding: 0 var(--sp-1); }
.btn-text:hover { opacity: 0.8; }

/* ---- Hero (Brief §2.4) ---------------------------------------------------- */
.hero {
  padding-block: var(--sp-16) var(--sp-12);
  border-bottom: 1px solid var(--divider);
}
.hero .container { max-width: 900px; }
.hero h1 { margin-block: var(--sp-2) var(--sp-3); }
.hero__subtitle { font-size: 20px; max-width: 640px; margin-bottom: var(--sp-4); }
.hero__meta {
  display: flex; align-items: center; gap: var(--sp-3);
  margin-top: var(--sp-4);
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ---- Section shell --------------------------------------------------------- */
.section {
  padding-block: var(--sp-12);
  border-bottom: 1px solid var(--divider);
}
.section__head { max-width: 720px; margin-bottom: var(--sp-6); }
.section__head p { margin-top: var(--sp-2); }

/* ---- Filters (Brief §5.11) -------------------------------------------------- */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: var(--sp-1);
  margin-bottom: var(--sp-4);
}
.filter-btn {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border: 1px solid var(--divider);
  border-radius: var(--radius-button);
  padding: var(--sp-1) var(--sp-3);
  min-height: 44px;
  transition: background var(--dur-fast) ease, color var(--dur-fast) ease, border-color var(--dur-fast) ease;
}
.filter-btn:hover { color: var(--text-primary); border-color: var(--accent); }
.filter-btn[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* ---- Gallery grid (Brief §4.6) --------------------------------------------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
}
@media (max-width: 1023px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .gallery { grid-template-columns: 1fr; } }

.card {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--surface);
  transition: opacity var(--dur-med) ease;
}
.card[hidden] { display: none; }

.card-media {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  position: relative;
  background: var(--surface);
}
.card-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease-out);
}
.card:hover .card-media img,
.card:focus-within .card-media img { transform: scale(1.04); }

.card-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--sp-1);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.06em;
}
.card-placeholder svg { opacity: 0.5; }

.card-btn {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  cursor: pointer;
}

.card-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: var(--sp-2);
  display: flex; justify-content: space-between; align-items: baseline;
  background: linear-gradient(to top, rgba(0,0,0,0.55), transparent);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
  pointer-events: none;
}
.card:hover .card-caption,
.card:focus-within .card-caption { opacity: 1; transform: translateY(0); }
.card-title { font-family: var(--font-heading); font-weight: 600; font-size: 14px; color: var(--text-primary); }
.card-tag { font-size: 12px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em; }

/* Featured cards slightly larger emphasis */
.featured-gallery { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1023px) { .featured-gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .featured-gallery { grid-template-columns: 1fr; } }

/* ---- About & Contact --------------------------------------------------------- */
.about .container,
.contact .container { max-width: 720px; }
.contact-links {
  display: flex; flex-wrap: wrap; gap: var(--sp-3);
  margin-top: var(--sp-4);
}
.contact-links a {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 44px;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--divider);
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease;
}
.contact-links a:hover { color: var(--accent); border-color: var(--accent); }
.contact-cta { margin-top: var(--sp-6); }

/* ---- Footer ------------------------------------------------------------------ */
.site-footer {
  padding-block: var(--sp-6);
}
.site-footer .container {
  display: flex; flex-wrap: wrap; gap: var(--sp-2);
  align-items: center; justify-content: space-between;
}
.site-footer nav ul { display: flex; gap: var(--sp-3); flex-wrap: wrap; }
.site-footer a { font-size: 14px; color: var(--text-secondary); text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.site-footer a:hover { color: var(--accent); }
.footer-copy { font-size: 13px; color: var(--text-secondary); }

/* ---- Lightbox (Brief §4.8, §5.8) --------------------------------------------- */
.lightbox {
  position: fixed; inset: 0;
  background: rgba(10,11,13,0.94);
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
  opacity: 0; visibility: hidden;
  transition: opacity var(--dur-med) var(--ease-out);
}
.lightbox.is-open { opacity: 1; visibility: visible; }
.lightbox__figure {
  position: relative;
  max-width: min(92vw, 1200px);
  max-height: 88vh;
  display: flex; flex-direction: column; gap: var(--sp-2);
  transform: scale(0.97);
  transition: transform var(--dur-med) var(--ease-out);
}
.lightbox.is-open .lightbox__figure { transform: scale(1); }
.lightbox__figure img {
  max-height: 76vh;
  width: auto; margin-inline: auto;
  border-radius: var(--radius-image);
  object-fit: contain;
}
.lightbox__meta {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--font-heading); font-size: 14px; color: var(--text-secondary);
}
.lightbox__close, .lightbox__prev, .lightbox__next {
  position: absolute;
  min-width: 48px; min-height: 48px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
  transition: background var(--dur-fast) ease;
}
.lightbox__close:hover, .lightbox__prev:hover, .lightbox__next:hover { background: rgba(255,255,255,0.14); }
.lightbox__close { top: -8px; right: -8px; }
.lightbox__prev { left: -64px; top: 50%; transform: translateY(-50%); }
.lightbox__next { right: -64px; top: 50%; transform: translateY(-50%); }
@media (max-width: 900px) {
  .lightbox__prev { left: var(--sp-1); }
  .lightbox__next { right: var(--sp-1); }
  .lightbox__close { top: var(--sp-1); right: var(--sp-1); }
}

/* Skeleton loading state (Brief §5.19) */
.card-media.is-loading { background: linear-gradient(100deg, var(--surface) 30%, #262b34 50%, var(--surface) 70%); background-size: 300% 100%; animation: shimmer 1.6s ease-in-out infinite; }
@keyframes shimmer { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* ---- Mobile nav ------------------------------------------------------------ */
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav ul {
    position: fixed; inset: 64px 0 0 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg-primary);
    padding: var(--sp-4);
    transform: translateX(100%);
    transition: transform var(--dur-med) var(--ease-out);
  }
  .primary-nav[data-open="true"] ul { transform: translateX(0); }
  .primary-nav ul a { width: 100%; padding-block: var(--sp-2); border-bottom: 1px solid var(--divider); }
}