/* ---------- Tokens ---------- */
:root {
  --bg: #f7f5f1;
  --bg-elev: #ffffff;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-mute: #8a8a8a;
  --rule: #e6e1d8;

  /* Villa: warm bronze/sand */
  --accent-villa: #8a6a3e;
  --accent-villa-soft: #c9b48a;
  --hero-villa: linear-gradient(135deg, #2a2520 0%, #4a3a28 55%, #8a6a3e 100%);

  /* Arsa: deep olive/earth */
  --accent-arsa: #4a5a3a;
  --accent-arsa-soft: #a8b08a;
  --hero-arsa: linear-gradient(135deg, #1f2418 0%, #364027 55%, #6a7a4a 100%);

  --accent: var(--accent-villa);
  --accent-soft: var(--accent-villa-soft);
  --hero-grad: var(--hero-villa);

  --maxw: 1180px;
  --pad-x: clamp(20px, 5vw, 64px);

  --serif: "Cormorant Garamond", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;

  --t-fast: 220ms cubic-bezier(.2,.7,.2,1);
  --t-med: 480ms cubic-bezier(.2,.7,.2,1);
}

[data-brand="arsa"] {
  --accent: var(--accent-arsa);
  --accent-soft: var(--accent-arsa-soft);
  --hero-grad: var(--hero-arsa);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background var(--t-med);
}
a { color: inherit; }
img { max-width: 100%; display: block; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  padding: 18px var(--pad-x);
  background: rgba(247, 245, 241, 0.85);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule);
  transition: background var(--t-med), border-color var(--t-med);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 500;
  color: var(--ink);
}
.brand-logo {
  width: 34px;
  height: 34px;
  color: var(--ink);
  transition: color var(--t-med);
}
.brand-logo.small { width: 24px; height: 24px; }
.brand-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  letter-spacing: 0.18em;
}
.brand-name { font-size: 14px; }
.brand-suffix {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--accent);
  text-transform: lowercase;
  transition: color var(--t-med);
}

.primary-nav {
  justify-self: center;
  display: flex;
  gap: 28px;
}
.primary-nav a {
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.primary-nav a:hover { color: var(--ink); border-bottom-color: var(--accent); }

/* ---------- Brand toggle ---------- */
.brand-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 4px;
  isolation: isolate;
}
.brand-toggle button {
  position: relative;
  z-index: 2;
  border: 0;
  background: transparent;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--ink-soft);
  transition: color var(--t-fast);
}
.brand-toggle button[aria-selected="true"] { color: #fff; }
.brand-toggle-thumb {
  position: absolute;
  z-index: 1;
  top: 4px;
  bottom: 4px;
  width: calc(50% - 4px);
  left: 4px;
  background: var(--accent);
  border-radius: 999px;
  transition: transform var(--t-med), background var(--t-med);
}
[data-brand="arsa"] .brand-toggle-thumb { transform: translateX(100%); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 78vh;
  padding: clamp(80px, 14vh, 160px) var(--pad-x) clamp(60px, 10vh, 120px);
  color: #f5f1e8;
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: #1a1a1a;
  background-image: var(--hero-image, none), var(--hero-grad);
  background-size: cover, auto;
  background-position: center, center;
  background-blend-mode: multiply, normal;
  transition: background-image var(--t-med);
}
[data-brand="villa"] .hero-bg { --hero-image: url("assets/images/riva-deresi.jpg"); }
[data-brand="arsa"]  .hero-bg { --hero-image: url("assets/images/riva-deresi-2.jpg"); }
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(20,16,12,0.35) 0%, rgba(20,16,12,0.65) 100%),
    radial-gradient(1200px 600px at 80% 10%, rgba(255,255,255,0.08), transparent 60%);
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; }
.eyebrow {
  margin: 0 0 28px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--accent-soft);
  text-transform: uppercase;
  transition: color var(--t-med);
}
.hero-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  max-width: 18ch;
}
.hero-title em { display: block; font-style: italic; color: var(--accent-soft); transition: color var(--t-med); }
.hero-lede {
  margin: 28px 0 36px;
  max-width: 58ch;
  font-size: 17px;
  color: rgba(245, 241, 232, 0.82);
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta {
  position: absolute;
  left: var(--pad-x);
  right: var(--pad-x);
  bottom: 28px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(245, 241, 232, 0.6);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast), background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.btn-primary { background: #fff; color: #1a1a1a; }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { border-color: rgba(255,255,255,0.5); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,0.08); }

/* ---------- Sections ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(72px, 12vh, 130px) var(--pad-x);
  border-top: 1px solid var(--rule);
}
.section:first-of-type { border-top: 0; }
.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 48px;
}
.section-number {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--accent);
  transition: color var(--t-med);
}
.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 44px);
  letter-spacing: -0.005em;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(28px, 5vw, 80px);
}
.about-grid .lead {
  font-family: var(--serif);
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.3;
  margin: 0;
  color: var(--ink);
}
.about-grid p:not(.lead) {
  color: var(--ink-soft);
  font-size: 16px;
  margin: 0;
}

/* Approach */
.approach-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  counter-reset: step;
}
.approach-list li {
  padding: 28px;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 4px;
  counter-increment: step;
  position: relative;
}
.approach-list li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 16px;
  right: 20px;
  font-family: var(--serif);
  font-size: 14px;
  color: var(--accent);
  transition: color var(--t-med);
}
.approach-list h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 24px;
}
.approach-list p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.services-grid article {
  padding: 28px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--bg-elev);
  transition: border-color var(--t-fast), transform var(--t-fast);
}
.services-grid article:hover { border-color: var(--accent); transform: translateY(-2px); }
.services-grid h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
}
.services-grid p { margin: 0; color: var(--ink-soft); font-size: 15px; }
[hidden] { display: none !important; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 32px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.contact-label {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.contact-value {
  margin: 0;
  font-family: var(--serif);
  font-size: 22px;
}
.contact-value a { text-decoration: none; border-bottom: 1px solid var(--accent); }
.contact-note {
  margin: 28px 0 0;
  font-size: 14px;
  color: var(--ink-mute);
  max-width: 64ch;
}

/* Social */
.social { margin-top: 36px; }
.social .contact-label { margin-bottom: 14px; }
.social-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.social-list a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--bg-elev);
  transition: border-color var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.social-list a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.social-list svg { width: 18px; height: 18px; }

/* WhatsApp floating action button */
.whatsapp-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px 14px 16px;
  background: #25d366;
  color: #fff;
  border-radius: 999px;
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  font-weight: 500;
  box-shadow: 0 10px 28px rgba(37, 211, 102, 0.35), 0 2px 6px rgba(0,0,0,0.15);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}
.whatsapp-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(37, 211, 102, 0.45), 0 2px 6px rgba(0,0,0,0.15);
}
.whatsapp-fab svg { width: 22px; height: 22px; }
@media (max-width: 520px) {
  .whatsapp-fab { padding: 14px; bottom: 16px; right: 16px; }
  .whatsapp-fab span { display: none; }
}

/* Footer */
.site-footer {
  padding: 28px var(--pad-x) 32px;
  border-top: 1px solid var(--rule);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.footer-meta { display: inline-flex; gap: 20px; flex-wrap: wrap; justify-content: flex-end; }
.footer-meta a { text-decoration: none; border-bottom: 1px solid var(--accent); }
.footer-credits {
  margin: 18px 0 0;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--ink-mute);
  max-width: 80ch;
  line-height: 1.6;
}

/* ---------- Brand swap animation ---------- */
[data-swap] { transition: opacity var(--t-fast); }
[data-swap].is-swapping { opacity: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .site-header { grid-template-columns: auto auto; row-gap: 12px; }
  .primary-nav { grid-column: 1 / -1; justify-self: start; gap: 18px; flex-wrap: wrap; }
  .about-grid, .approach-list, .services-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-meta { position: static; margin-top: 40px; flex-wrap: wrap; }
}
@media (max-width: 520px) {
  .contact-grid { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; align-items: flex-start; }
  .footer-meta { justify-content: flex-start; }
}