/* ============================================================
   Gallery Pro — Paper Design System
   Based on SKILL.md: minimal, clean, paper-textured
   Tokens: primary=#111111, secondary=#8B5CF6, surface=#FFFFFF
   Fonts: Roboto (body), Montserrat (display), PT Mono (mono)
   ============================================================ */

:root {
  /* Color tokens */
  --color-primary:   #111111;
  --color-secondary: #8B5CF6;
  --color-success:   #16A34A;
  --color-warning:   #D97706;
  --color-danger:    #DC2626;
  --color-surface:   #FFFFFF;
  --color-text:      #111827;
  --color-text-muted:#6B7280;
  --color-border:    #E5E7EB;
  --color-bg:        #FAFAF8;
  --color-paper:     #F7F5F0;

  /* Typography */
  --font-body:    'Roboto', sans-serif;
  --font-display: 'Montserrat', sans-serif;
  --font-mono:    'PT Mono', monospace;

  /* Type scale */
  --text-xs:   0.875rem;  /* 14px */
  --text-sm:   1rem;      /* 16px */
  --text-base: 1.125rem;  /* 18px */
  --text-lg:   1.5rem;    /* 24px */
  --text-xl:   2rem;      /* 32px */
  --text-2xl:  2.5rem;    /* 40px */

  /* Spacing scale: 4/8/12/16/24/32 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radius */
  --radius-sm: 2px;
  --radius:    4px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(17,17,17,.08);
  --shadow:    0 2px 8px rgba(17,17,17,.10);
  --shadow-lg: 0 4px 24px rgba(17,17,17,.12);

  /* Transitions */
  --transition: 150ms ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
}
h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }

a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; transition: opacity var(--transition); }
a:hover { opacity: .7; }
a:focus-visible { outline: 2px solid var(--color-secondary); outline-offset: 2px; border-radius: var(--radius-sm); }

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container--narrow { max-width: 760px; }
.container--wide   { max-width: 1400px; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--color-secondary); outline-offset: 2px; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; pointer-events: none; }

.btn--primary {
  background: var(--color-primary);
  color: var(--color-surface);
  border-color: var(--color-primary);
}
.btn--primary:hover { background: #2d2d2d; border-color: #2d2d2d; opacity: 1; }

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--secondary:hover { background: var(--color-primary); color: var(--color-surface); opacity: 1; }

.btn--accent {
  background: var(--color-secondary);
  color: var(--color-surface);
  border-color: var(--color-secondary);
}
.btn--accent:hover { background: #7c3aed; border-color: #7c3aed; opacity: 1; }

.btn--sm { padding: var(--space-2) var(--space-4); font-size: .75rem; }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--text-sm); }

/* ---- Forms ---- */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-6); }
label { font-family: var(--font-display); font-size: var(--text-xs); font-weight: 600; letter-spacing: .05em; text-transform: uppercase; color: var(--color-text); }
.form-control {
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.form-control:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(17,17,17,.08); }
.form-control::placeholder { color: var(--color-text-muted); }
textarea.form-control { resize: vertical; min-height: 120px; }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23111827' stroke-width='1.5' fill='none'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right var(--space-4) center; padding-right: var(--space-8); }

/* ---- Cards ---- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card__image { aspect-ratio: 4/3; overflow: hidden; }
.card__image img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card__image img { transform: scale(1.04); }
.card__body { padding: var(--space-6); }
.card__title { font-family: var(--font-display); font-size: var(--text-base); font-weight: 600; margin-bottom: var(--space-2); }
.card__meta { font-size: var(--text-xs); color: var(--color-text-muted); margin-bottom: var(--space-4); }
.card__text { font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.6; }

/* ---- Grid ---- */
.grid { display: grid; gap: var(--space-6); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

/* ---- Badge ---- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-display);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  border-radius: 2px;
}
.badge--upcoming { background: #EEF2FF; color: #4338CA; }
.badge--ongoing  { background: #F0FDF4; color: var(--color-success); }
.badge--past     { background: #F9FAFB; color: var(--color-text-muted); }
.badge--available{ background: #F0FDF4; color: var(--color-success); }
.badge--sold     { background: #FEF2F2; color: var(--color-danger); }
.badge--exhibited{ background: #FFF7ED; color: var(--color-warning); }

/* ---- Section ---- */
.section { padding-block: var(--space-16); }
.section--sm { padding-block: var(--space-12); }
.section--paper { background: var(--color-paper); }
.section__header { margin-bottom: var(--space-12); }
.section__label {
  display: block;
  font-family: var(--font-display);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.section__title { margin-bottom: var(--space-4); }
.section__desc { font-size: var(--text-base); color: var(--color-text-muted); max-width: 600px; }

/* ---- Divider ---- */
hr { border: none; border-top: 1px solid var(--color-border); margin-block: var(--space-8); }

/* ---- Alert ---- */
.alert { padding: var(--space-4) var(--space-6); border-radius: var(--radius-sm); margin-bottom: var(--space-6); font-size: var(--text-xs); }
.alert--success { background: #F0FDF4; color: #15803D; border-left: 3px solid var(--color-success); }
.alert--error   { background: #FEF2F2; color: #B91C1C; border-left: 3px solid var(--color-danger); }
.alert--warning { background: #FFFBEB; color: #92400E; border-left: 3px solid var(--color-warning); }
.alert--info    { background: #EFF6FF; color: #1D4ED8; border-left: 3px solid #3B82F6; }

/* ---- Lightbox ---- */
.lightbox-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(17,17,17,.92);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}
.lightbox-overlay.active { display: flex; }
.lightbox-overlay img { max-height: 90vh; max-width: 90vw; object-fit: contain; }
.lightbox-close { position: absolute; top: var(--space-6); right: var(--space-6); color: #fff; background: none; border: none; font-size: 2rem; cursor: pointer; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  h1 { font-size: var(--text-xl); }
  h2 { font-size: var(--text-lg); }
  .container { padding-inline: var(--space-4); }
  .section { padding-block: var(--space-12); }
  .section--sm { padding-block: var(--space-8); }
}

/* ---- Utility ---- */
.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }
.mt-auto     { margin-top: auto; }
.d-flex      { display: flex; }
.align-center{ align-items: center; }
.gap-4       { gap: var(--space-4); }
.gap-6       { gap: var(--space-6); }
.mb-4        { margin-bottom: var(--space-4); }
.mb-8        { margin-bottom: var(--space-8); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

/* ---- Rich text content ---- */
.rich-text h1, .rich-text h2, .rich-text h3 { margin-bottom: var(--space-4); margin-top: var(--space-8); }
.rich-text p  { margin-bottom: var(--space-4); }
.rich-text ul, .rich-text ol { margin: 0 0 var(--space-4) var(--space-8); }
.rich-text li { margin-bottom: var(--space-2); }
.rich-text blockquote { border-left: 3px solid var(--color-secondary); padding-left: var(--space-6); margin: var(--space-8) 0; font-style: italic; color: var(--color-text-muted); }
.rich-text a  { color: var(--color-secondary); }