/* ==================================================
   Nội thất Cường Nga — website tĩnh, tối ưu SEO local
   ================================================== */

:root {
  --color-bg: #faf6f1;
  --color-bg-alt: #f1e9df;
  --color-surface: #ffffff;
  --color-text: #2b211c;
  --color-text-muted: #6b5d52;
  --color-primary: #6b3f2a;
  --color-primary-dark: #4c2c1c;
  --color-accent: #b5793a;
  --color-border: #e5d9c9;
  --radius: 10px;
  --shadow: 0 4px 16px rgba(43, 33, 28, 0.08);
  --max-width: 1160px;
  --font-body: "Be Vietnam Pro", "Segoe UI", Roboto, -apple-system, sans-serif;
  --font-heading: "Playfair Display", "Be Vietnam Pro", Georgia, serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { padding: 0; margin: 0; list-style: none; }
h1, h2, h3 { font-family: var(--font-heading); line-height: 1.25; margin: 0 0 .5em; color: var(--color-primary-dark); }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section--alt { background: var(--color-bg-alt); }
.section-head { max-width: 640px; margin: 0 auto 40px; text-align: center; }
.section-head p { color: var(--color-text-muted); }
.eyebrow {
  display: inline-block;
  font-size: .8rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow); }
.btn--primary:hover { background: var(--color-primary-dark); }
.btn--outline { background: transparent; border-color: var(--color-primary); color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; }
.btn--light { background: #fff; color: var(--color-primary); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 246, 241, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}
.brand-mark {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.1rem;
}
.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}
.nav-links a {
  font-size: .95rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { border-color: var(--color-accent); color: var(--color-primary-dark); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  width: 42px; height: 42px;
  font-size: 1.3rem;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 56px 0 64px;
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.hero h1 { margin-bottom: 16px; }
.hero-lead { font-size: 1.05rem; color: var(--color-text-muted); margin-bottom: 24px; }
.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.hero-stat strong { display: block; font-size: 1.6rem; color: var(--color-primary); font-family: var(--font-heading); }
.hero-stat span { font-size: .85rem; color: var(--color-text-muted); }
.hero-media {
  aspect-ratio: 4/3;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  font-size: .9rem;
  text-align: center;
  padding: 24px;
}

/* Cards / grid */
.grid { display: grid; gap: 24px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  height: 100%;
}
.card .icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--color-bg-alt);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 14px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--color-text-muted); font-size: .95rem; margin-bottom: 0; }
.card a.card-link { display: inline-block; margin-top: 12px; font-weight: 600; color: var(--color-primary); font-size: .9rem; }

/* Gallery / before-after placeholders */
.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}
.gallery-thumb {
  aspect-ratio: 4/3;
  background: repeating-linear-gradient(135deg, var(--color-bg-alt), var(--color-bg-alt) 10px, #ece1d2 10px, #ece1d2 20px);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  font-size: .85rem;
  text-align: center;
  padding: 16px;
}
.gallery-caption { padding: 14px 16px; }
.gallery-caption h3 { font-size: 1rem; margin-bottom: 4px; }
.gallery-caption p { font-size: .85rem; margin: 0; color: var(--color-text-muted); }

/* Testimonials */
.testimonial {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.testimonial .stars { color: var(--color-accent); margin-bottom: 10px; letter-spacing: 2px; }
.testimonial footer { margin-top: 14px; font-weight: 600; color: var(--color-primary-dark); font-size: .9rem; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step { text-align: center; }
.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-family: var(--font-heading);
}
.step h3 { font-size: 1rem; }
.step p { font-size: .88rem; color: var(--color-text-muted); }

/* CTA band */
.cta-band {
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin-bottom: 6px; }
.cta-band p { color: #f1e3d3; margin: 0; }

/* Map embed */
.map-embed {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  aspect-ratio: 16/9;
}
.map-embed iframe { width: 100%; height: 100%; border: 0; }

/* Contact layout */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info li { display: flex; gap: 12px; margin-bottom: 18px; align-items: flex-start; }
.contact-info .icon { flex-shrink: 0; width: 38px; height: 38px; border-radius: 10px; background: var(--color-bg-alt); color: var(--color-primary); display: flex; align-items: center; justify-content: center; }
.contact-info strong { display: block; }
.contact-info span, .contact-info a { color: var(--color-text-muted); font-size: .93rem; }

form.contact-form { display: grid; gap: 14px; background: var(--color-surface); border: 1px solid var(--color-border); padding: 26px; border-radius: var(--radius); box-shadow: var(--shadow); }
form.contact-form label { font-size: .88rem; font-weight: 600; margin-bottom: 4px; display: block; }
form.contact-form input, form.contact-form textarea, form.contact-form select {
  width: 100%;
  padding: 11px 12px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  font-family: inherit;
  font-size: .95rem;
  background: #fff;
}
form.contact-form textarea { min-height: 110px; resize: vertical; }
.form-note { font-size: .8rem; color: var(--color-text-muted); }

/* Social floating buttons */
.float-actions {
  position: fixed;
  right: 18px;
  bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 60;
}
.float-actions a {
  width: 52px; height: 52px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 6px 18px rgba(43,33,28,.25);
  color: #fff;
}
.float-call { background: var(--color-primary); }
.float-zalo { background: #0068ff; }

/* Footer */
.site-footer { background: var(--color-primary-dark); color: #efe3d5; padding: 52px 0 24px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer-grid h3 { color: #fff; font-size: 1rem; margin-bottom: 14px; }
.footer-grid p, .footer-grid li, .footer-grid a { color: #d9c9b5; font-size: .9rem; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a:hover { color: #fff; }
.footer-social { display: flex; gap: 10px; margin-top: 14px; }
.footer-social a {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.25);
  display: flex; align-items: center; justify-content: center;
}
.footer-bottom {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.12);
  font-size: .82rem;
  color: #b8a48f;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* Breadcrumb */
.breadcrumb { font-size: .85rem; color: var(--color-text-muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--color-primary); }

/* Blog */
.blog-card { display: flex; flex-direction: column; }
.blog-meta { font-size: .8rem; color: var(--color-text-muted); margin-bottom: 8px; }
article.post { max-width: 760px; margin: 0 auto; }
article.post h2 { margin-top: 1.6em; }
article.post ul { list-style: disc; padding-left: 22px; margin-bottom: 1em; }
article.post li { margin-bottom: 6px; }
.post-hero { aspect-ratio: 16/8; margin-bottom: 24px; }

/* FAQ */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 22px;
  margin-bottom: 12px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 16px 0;
  color: var(--color-primary-dark);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; float: right; font-size: 1.3rem; color: var(--color-accent); }
.faq-item[open] summary::after { content: '\2212'; }
.faq-item p { padding-bottom: 16px; margin: 0; color: var(--color-text-muted); }

/* Table */
table.price-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
table.price-table th, table.price-table td { padding: 12px 16px; border-bottom: 1px solid var(--color-border); text-align: left; font-size: .92rem; }
table.price-table th { background: var(--color-bg-alt); color: var(--color-primary-dark); }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid--3, .grid--4, .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-links, .nav-cta .btn--outline { display: none; }
  .nav-toggle { display: block; }
  .nav.open .nav-links {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    gap: 16px;
  }
  .grid--3, .grid--4, .grid--2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band { flex-direction: column; text-align: center; }
  .section { padding: 44px 0; }
}