/* ─────────────────────────────────────────────
   BÁRBARA SALA INTERIORES — Design System
   ───────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;1,300;1,400&family=Inter:wght@300;400;500&display=swap');

/* ── Variables ── */
:root {
  --bg:        #F4F1EC;
  --black:     #0F0F0F;
  --mid:       #6B6B6B;
  --light:     #C8C3BC;
  --accent:    #B87155;
  --white:     #FFFFFF;

  --serif:     'Cormorant Garamond', Georgia, serif;
  --sans:      'Inter', system-ui, sans-serif;

  --gap:       clamp(1.5rem, 4vw, 3rem);
  --section:   clamp(5rem, 12vw, 10rem);
  --max-w:     1440px;
}

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

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

body {
  background-color: var(--bg);
  color: var(--black);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

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

/* ── Utility ── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 5vw, 5rem);
}

/* ─────────────────────────────────────────────
   NAV
   ───────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.75rem clamp(1.5rem, 5vw, 5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.4s ease, backdrop-filter 0.4s ease;
}

nav.scrolled {
  background: rgba(244, 241, 236, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--light);
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
  transition: color 0.4s;
}

nav.scrolled .nav-logo {
  color: var(--black);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 400;
  color: rgba(255,255,255,0.9);
  transition: color 0.2s;
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

nav.scrolled .nav-links a {
  color: var(--black);
  text-shadow: none;
}

.nav-links a:hover {
  color: var(--accent);
}

/* Mobile burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.burger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--white);
  transition: transform 0.3s, opacity 0.3s, background 0.4s;
}

nav.scrolled .burger span {
  background: var(--black);
}

.burger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3rem;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-family: var(--serif);
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--black);
  transition: color 0.2s;
}

.mobile-menu a:hover {
  color: var(--accent);
}

/* ─────────────────────────────────────────────
   HERO
   ───────────────────────────────────────────── */
#hero {
  position: relative;
  height: 100svh;
  min-height: 600px;
  display: grid;
  grid-template-rows: 1fr;
  overflow: hidden;
}

.hero-img {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(15,15,15,0.55) 0%, rgba(15,15,15,0) 20%),
    linear-gradient(to top,    rgba(15,15,15,0.65) 0%, rgba(15,15,15,0) 55%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: clamp(2rem, 5vw, 5rem) clamp(1.5rem, 5vw, 5rem);
  padding-bottom: clamp(3rem, 7vw, 6rem);
  color: var(--white);
}

.hero-label {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 400;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(3.5rem, 9vw, 9rem);
  font-weight: 300;
  line-height: 0.95;
  letter-spacing: -0.01em;
}

.hero-title em {
  font-style: italic;
  font-weight: 300;
}

.hero-sub {
  margin-top: 1.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  right: clamp(1.5rem, 5vw, 5rem);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--white);
  opacity: 0.9;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-shadow: 0 1px 6px rgba(0,0,0,0.5);
}

.hero-scroll::after {
  content: '';
  display: block;
  width: 1px;
  height: 3rem;
  background: var(--white);
  animation: scrollLine 1.8s ease-in-out infinite;
}

@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ─────────────────────────────────────────────
   SECTION HEADERS
   ───────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--black);
  padding-top: 1.25rem;
}

.section-number {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--mid);
  min-width: 1.8rem;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.section-title em {
  font-style: italic;
}

/* ─────────────────────────────────────────────
   PROJECTS
   ───────────────────────────────────────────── */
#proyectos {
  padding: var(--section) 0 clamp(2.5rem, 5vw, 4rem);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2vw, 1.5rem);
}

/* Alternating layout: wide, narrow, narrow, wide */
.project-card:nth-child(1) { grid-column: span 7; }
.project-card:nth-child(2) { grid-column: span 5; }
.project-card:nth-child(3) { grid-column: span 5; }
.project-card:nth-child(4) { grid-column: span 7; }
.project-card:nth-child(5) { grid-column: span 4; }
.project-card:nth-child(6) { grid-column: span 4; }
.project-card:nth-child(7) { grid-column: span 4; }

.project-card {
  cursor: pointer;
  position: relative;
  overflow: hidden;
  background: transparent;
}

.project-card-img {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--light);
}

.project-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              filter 0.5s ease;
  filter: saturate(0.9);
}

.project-card:hover .project-card-img img {
  transform: scale(1.04);
  filter: saturate(1);
}

.project-card-info {
  padding: 1.1rem 0 0.25rem;
}

.project-card-category {
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 0.35rem;
}

.project-card-title {
  font-family: var(--serif);
  font-size: clamp(1rem, 2.2vw, 1.4rem);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--black);
}

.project-card-arrow {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--mid);
  transition: color 0.2s, gap 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.project-card:hover .project-card-arrow {
  color: var(--accent);
  gap: 0.8rem;
}

.project-card-arrow::after {
  content: '→';
  transition: transform 0.2s;
}

.project-card:hover .project-card-arrow::after {
  transform: translateX(4px);
}

/* ─────────────────────────────────────────────
   GALLERY OVERLAY
   ───────────────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--black);
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  transition: transform 0.6s cubic-bezier(0.77, 0, 0.175, 1);
}

.overlay.open {
  transform: translateY(0);
}

.overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem clamp(1.5rem, 5vw, 5rem);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
}

.overlay-meta {
  color: var(--white);
}

.overlay-category {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.3rem;
}

.overlay-title {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 300;
  color: var(--white);
}

.overlay-close {
  background: none;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--white);
  cursor: pointer;
  padding: 0.6rem 1.2rem;
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: background 0.2s, border-color 0.2s;
}

.overlay-close:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.4);
}

.overlay-body {
  flex: 1;
  overflow-y: auto;
  padding: clamp(1.5rem, 3vw, 3rem) clamp(1.5rem, 5vw, 5rem);
}

.overlay-description {
  color: rgba(255,255,255,0.78);
  font-size: 0.88rem;
  line-height: 1.8;
  max-width: 560px;
  margin-bottom: 2.5rem;
}

/* ── Before / After Slider ── */
.ba-slider {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  max-height: 52vh;
  cursor: ew-resize;
  margin-bottom: 2rem;
  user-select: none;
}

.ba-after,
.ba-before {
  position: absolute;
  inset: 0;
}

.ba-after img,
.ba-before img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: unset;
  cursor: ew-resize;
}

.ba-before {
  clip-path: inset(0 50% 0 0);
}

.ba-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: rgba(255,255,255,0.8);
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.ba-handle-btn {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
  flex-shrink: 0;
  font-size: 0.65rem;
  color: var(--black);
  letter-spacing: 0.05em;
}

.ba-label {
  position: absolute;
  bottom: 1rem;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--white);
  background: rgba(0,0,0,0.45);
  padding: 0.3rem 0.7rem;
  pointer-events: none;
}

.ba-label-before { left: 1rem; }
.ba-label-after  { right: 1rem; }

/* ── Gallery Grid ── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  gap: 0.5rem;
}

.gallery-grid img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  cursor: zoom-in;
  transition: opacity 0.2s;
}

.gallery-grid img:hover {
  opacity: 0.85;
}

/* ─────────────────────────────────────────────
   LIGHTBOX
   ───────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0,0,0,0.95);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  cursor: zoom-out;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  pointer-events: none;
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: rgba(255,255,255,0.6);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.lightbox-close:hover {
  color: var(--white);
}

/* ─────────────────────────────────────────────
   ABOUT
   ───────────────────────────────────────────── */
#sobre {
  padding: clamp(2.5rem, 5vw, 4rem) 0 var(--section);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}

.about-img-wrap {
  position: relative;
}

.about-img-wrap img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: top;
}

.about-img-caption {
  margin-top: 1rem;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--mid);
}

.about-text-wrap {
  padding-top: 1rem;
}

.about-lead {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3.5vw, 2.6rem);
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
}

.about-lead em {
  font-style: italic;
}

.about-body {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--mid);
  max-width: 500px;
}

.about-body p + p {
  margin-top: 1.2rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--light);
}

.stat-number {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 300;
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  margin-top: 0.4rem;
  display: block;
}

/* ─────────────────────────────────────────────
   CONTACT
   ───────────────────────────────────────────── */
#contacto {
  padding: var(--section) 0;
  background: var(--black);
  color: var(--white);
}

#contacto .section-header {
  border-top-color: rgba(255,255,255,0.15);
}

#contacto .section-number {
  color: rgba(255,255,255,0.35);
}

#contacto .section-title {
  color: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 8vw, 8rem);
  align-items: end;
}

.contact-headline {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
}

.contact-headline em {
  font-style: italic;
}

.contact-body {
  font-size: 0.85rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.72);
  max-width: 420px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.contact-item-label {
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.58);
}

.contact-item-value {
  font-family: var(--serif);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 300;
  color: var(--white);
  transition: color 0.2s;
}

.contact-item-value:hover {
  color: var(--accent);
}

/* ─────────────────────────────────────────────
   FOOTER
   ───────────────────────────────────────────── */
footer {
  background: var(--black);
  color: rgba(255,255,255,0.55);
  padding: 2rem clamp(1.5rem, 5vw, 5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ─────────────────────────────────────────────
   FADE-IN ANIMATIONS
   ───────────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────────
   RESPONSIVE
   ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .burger    { display: flex; }

  .projects-grid {
    grid-template-columns: 1fr 1fr;
  }

  .project-card:nth-child(n) { grid-column: span 1; }
  .project-card:nth-child(1) { grid-column: span 2; }
  .project-card:nth-child(4) { grid-column: span 2; }

  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }

  .about-img-wrap { max-width: 380px; }
}

@media (max-width: 560px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .project-card:nth-child(n) { grid-column: span 1; }

  .about-stats { grid-template-columns: repeat(3,1fr); }

  footer {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}