/* ============================================================
   Estudio Llana — arquitectura minimalista, monocromo.
   ============================================================ */

:root {
  --color-bg: #ffffff;
  --color-ink: #0f0f0f;
  --color-grey: #6b6b6b;
  --color-line: #e2e2e2;
  --color-bg-alt: #f4f4f4;

  --font-display: 'Archivo Black', sans-serif;
  --font-sans: 'Archivo', sans-serif;
  --max-width: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font-sans); background: var(--color-bg); color: var(--color-ink); line-height: 1.6; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.05; margin: 0 0 0.4em; text-transform: uppercase; letter-spacing: -0.01em; }
p { color: var(--color-grey); margin: 0 0 1em; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 32px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.2em; font-size: 0.72rem; font-weight: 700; color: var(--color-grey); margin-bottom: 0.9em; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.9em 1.8em; font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; border: 2px solid var(--color-ink); cursor: pointer; }
.btn-primary { background: var(--color-ink); color: #fff; }
.btn-primary:hover { background: #333; }
.btn-block { width: 100%; }

/* side dot nav */
.dot-nav { position: fixed; right: 28px; top: 50%; transform: translateY(-50%); display: flex; flex-direction: column; gap: 18px; z-index: 90; }
.dot { width: 10px; height: 10px; border-radius: 50%; border: 2px solid var(--color-ink); position: relative; }
.dot.active { background: var(--color-ink); }
.dot::after {
  content: attr(data-label); position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap;
  opacity: 0; transition: opacity 0.15s ease; background: var(--color-ink); color: #fff; padding: 3px 8px;
}
.dot:hover::after { opacity: 1; }
@media (max-width: 860px) { .dot-nav { display: none; } }

/* header */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--color-line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 84px; }
.brand { font-family: var(--font-display); font-size: 1rem; letter-spacing: 0.02em; }
.main-nav { display: flex; align-items: center; gap: 32px; font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.main-nav a { position: relative; padding-bottom: 4px; }
.main-nav a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px; background: var(--color-ink); transition: width 0.2s ease; }
.main-nav a:hover::after { width: 100%; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-ink); }

/* hero */
.hero { min-height: 84vh; display: flex; align-items: center; border-bottom: 1px solid var(--color-line); }
.hero-inner { max-width: 720px; }
.hero h1 { font-size: clamp(2.6rem, 7vw, 5rem); }
.hero h1 span { -webkit-text-stroke: 2px var(--color-ink); color: transparent; }
.hero-lead { font-size: 1.05rem; max-width: 44ch; margin: 24px 0 32px; }
.scroll-cue { font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.85rem; border-bottom: 2px solid var(--color-ink); padding-bottom: 4px; }

/* sections */
section { padding: 110px 0; }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }

/* filters + projects */
.filters { display: flex; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn { background: none; border: 1px solid var(--color-line); padding: 10px 20px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; cursor: pointer; color: var(--color-grey); }
.filter-btn:hover { border-color: var(--color-ink); color: var(--color-ink); }
.filter-btn.active { background: var(--color-ink); color: #fff; border-color: var(--color-ink); }

.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.project-card { position: relative; height: 280px; overflow: hidden; transition: opacity 0.25s ease, transform 0.25s ease; }
.project-card.hidden { display: none; }
.p1 { background: linear-gradient(135deg, #d9d9d9, #8a8a8a); }
.p2 { background: linear-gradient(135deg, #bfbfbf, #4a4a4a); }
.p3 { background: linear-gradient(135deg, #ececec, #a3a3a3); }
.p4 { background: linear-gradient(135deg, #9d9d9d, #2b2b2b); }
.p5 { background: linear-gradient(135deg, #cfcfcf, #6c6c6c); }
.p6 { background: linear-gradient(135deg, #b6b6b6, #3d3d3d); }
.project-overlay {
  position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 20px; background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.65));
  opacity: 0; transition: opacity 0.2s ease; color: #fff;
}
.project-card:hover .project-overlay { opacity: 1; }
.project-overlay span { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; opacity: 0.85; }
.project-overlay h3 { color: #fff; font-size: 1.1rem; margin: 0.2em 0 0; }

/* studio */
.studio { background: var(--color-ink); color: #fff; }
.studio h2, .studio .eyebrow { color: #fff; }
.studio p { color: #bdbdbd; }
.studio-inner { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 60px; align-items: center; }
.studio-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.stat { border: 1px solid rgba(255,255,255,0.2); padding: 24px; text-align: center; }
.stat-number { display: block; font-family: var(--font-display); font-size: 2.2rem; }
.stat-label { font-size: 0.78rem; color: #a3a3a3; text-transform: uppercase; letter-spacing: 0.05em; }

/* process */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-number { font-family: var(--font-display); font-size: 1.6rem; color: var(--color-line); display: block; margin-bottom: 12px; }
.process-step h3 { font-size: 1rem; }
.process-step p { font-size: 0.9rem; }

/* contact */
.contact { background: var(--color-bg-alt); }
.contact-inner { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; }
.contact-form { background: #fff; border: 1px solid var(--color-line); padding: 32px; }
.form-row { margin-bottom: 18px; }
label { display: block; font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 6px; }
input, select, textarea { width: 100%; padding: 0.75em 0.9em; border: 1px solid var(--color-line); font-family: inherit; background: #fff; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-ink); }
.form-status { margin-top: 14px; font-size: 0.85rem; font-weight: 700; }

/* footer */
.site-footer { border-top: 1px solid var(--color-line); padding: 40px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; }
.footer-inner .brand { font-size: 0.9rem; }
.footer-inner p { margin: 0; font-size: 0.82rem; }

/* responsive */
@media (max-width: 960px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .studio-inner, .contact-inner { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .main-nav { position: absolute; top: 84px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--color-line); flex-direction: column; align-items: flex-start; gap: 0; padding: 12px 32px 20px; display: none; }
  .main-nav.open { display: flex; }
  .main-nav a { width: 100%; padding: 12px 0; border-bottom: 1px solid var(--color-line); }
  .nav-toggle { display: flex; }
  .projects-grid, .process-grid { grid-template-columns: 1fr; }
  .studio-stats { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 10px; text-align: center; }
  section { padding: 64px 0; }
}