@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@300;400;500&display=swap&family=Jost:wgth@450;650');

:where(*, *::before, *::after) { box-sizing: border-box; margin: 0; }

:root {
  --bg:       #0a0a0f;
  --surface:  #111118;
  --surface2: #16161f;
  --border:   #222230;
  --accent1:  #c8f542;
  --accent2:  #ff6b35;
  --accent3:  #7b5ea7;
  --text:     #e8e8f0;
  --muted:    #6a6a88;
  --prog:     #c8f542;
  --ui:       #ff6b35;
  --theme-color: gold;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 300;
  min-height: 100vh;
  overflow-x: hidden;

  &::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(rgba(200,245,66,0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(200,245,66,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
  }
}

header {
  max-width: 1280px;
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin: auto;
  position: relative;
  z-index: 10;
  padding: 80px 60px 60px;

  .header-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--muted);
    text-transform: uppercase;
    margin-bottom: 20px;
  }

  .header-meta {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    flex-wrap: wrap;

    .meta-pill {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: 'IBM Plex Mono', monospace;
      font-size: 12px;
      color: var(--muted);

      .dot {
        width: 8px;
        height: 8px;
        border-radius: 50%;
      }
    }
  }

  h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(42px, 6vw, 80px);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.02em;
    max-width: 700px;

    em {
      font-style: italic;
      color: var(--accent1);
    }
  }
}

.tabs {
  position: sticky;
  top: 0;
  z-index: 100;
  overflow: hidden;
  background: rgba(10,10,15,0.9);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex;
  padding: 0 calc((100% - 1280px) /2);

  .tab {
    padding: 18px 30px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    border: none;
    background: none;
    color: var(--muted);
    transition: color 0.2s;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;

    .count {
      display: inline-block;
      margin-left: 8px;
      background: var(--surface2);
      border-radius: 3px;
      padding: 1px 6px;
      font-size: 10px;
    }

    &:hover { color: var(--text); }
    &.active { color: var(--text); }
    &.active.prog { border-bottom-color: var(--prog); color: var(--prog); }
    &.active.ui   { border-bottom-color: var(--ui);   color: var(--ui);   }
  }
}

main {
  position: relative;
  z-index: 10;
  padding: 60px;
  max-width: 1400px;
  margin: 0 auto;
}

.section {
  display: none;

  &.active { display: block; }

  .section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 48px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 20px;
  }

  .section-title {
    font-family: 'Playfair Display', serif;
    font-size: 36px;
    font-weight: 400;

    span {
      font-family: 'IBM Plex Mono', monospace;
      font-size: 13px;
      font-weight: 400;
      display: block;
      margin-bottom: 8px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
    }

    span.prog-label { color: var(--prog); }
    span.ui-label   { color: var(--ui);   }
  }
}

.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;

  .filter-btn {
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: none;
    color: var(--muted);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.2s;

    &:hover,
    &.active {
      background: var(--surface2);
      color: var(--text);
      border-color: var(--muted);
    }
  }
}

.patterns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2px;
}

.cat-creacional      { background: rgba(200,245,66,0.10); color: var(--prog); }
.cat-estructural     { background: rgba(123,94,167,0.15);  color: #b09fd4; }
.cat-comportamiento  { background: rgba(100,149,237,0.12); color: #8ab4f8; }
.cat-arquitectura    { background: rgba(70,130,180,0.12);  color: #6ca6cd; }
.cat-navegacion      { background: rgba(255,107,53,0.12);  color: var(--ui); }
.cat-layout          { background: rgba(147,112,219,0.12); color: #a88bda; }
.cat-contenido       { background: rgba(255,200,50,0.10);  color: #ffd76e; }
.cat-formularios     { background: rgba(80,200,140,0.10);  color: #7ecba1; }
.cat-retroalimentacion { background: rgba(255,100,130,0.10); color: #ff8fa8; }

.search-wrap {
  position: relative;
  margin-bottom: 32px;
  max-width: 400px;

  input {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    padding: 12px 16px 12px 40px;
    outline: none;
    transition: border-color 0.2s;
  }
  input:focus { border-color: var(--muted); }
  input::placeholder { color: var(--muted); }
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 14px;
}

footer {
  position: relative;
  z-index: 10;
  padding: 40px 60px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;

  p {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.05em;
  }
}

/* Responsive design */
@media (width <= 768px) {
  header, main, footer { padding: 40px 24px; }
  .tabs { padding: 0 24px; overflow-x: auto; }
  .patterns-grid { grid-template-columns: 1fr; }
}