/* An Mộc Interior — tinh tế, kiến trúc, nhiều khoảng trắng: trắng xương, than chì, gỗ óc chó. */
:root {
  --bone: #f4f1ec;
  --white: #fbfaf7;
  --char: #22211f;
  --char-2: #34322f;
  --walnut: #6b4a33;
  --walnut-deep: #553a27;
  --oak: #c9a77f;
  --sage: #7d8a72;
  --stone: #cfc8bd;
  --muted: #5d5851;
  --line: #ddd6cb;
  --serif: "Newsreader", "Times New Roman", Georgia, serif;
  --sans: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--white); color: var(--char); font: 400 15.5px/1.75 var(--sans); overflow-x: hidden; }
body.menu-locked { overflow: hidden; }
h1, h2, h3 { margin: 0 0 .5em; font-family: var(--serif); font-weight: 400; line-height: 1.1; letter-spacing: -.022em; font-optical-sizing: auto; }
h1 { font-size: clamp(2.5rem, 9.4vw, 5rem); font-weight: 300; }
h2 { font-size: clamp(2rem, 6vw, 3.3rem); font-weight: 300; }
h3 { font-size: 1.42rem; letter-spacing: -.01em; }
h1 em, h2 em { font-style: italic; color: var(--walnut); }
strong { font-weight: 500; }
p { margin: 0 0 1em; }
a { color: var(--walnut); text-underline-offset: 4px; }
:focus-visible { outline: 2px solid var(--walnut); outline-offset: 4px; }
.wrap { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 22px; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; padding: 10px 16px; background: var(--char); color: #fff; }
.skip:focus { top: 12px; }
.overline {
  display: flex; align-items: center; gap: 14px; margin: 0 0 20px; font-size: .74rem; font-weight: 500;
  letter-spacing: .22em; text-transform: uppercase; color: var(--muted);
}
.overline span { font: italic 500 1.05rem var(--serif); letter-spacing: 0; color: var(--walnut); padding-right: 14px; border-right: 1px solid var(--stone); }

/* ---- Nút ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 50px; padding: 12px 28px;
  border: 1px solid transparent; border-radius: 0; cursor: pointer; text-decoration: none;
  font: 500 .86rem/1.2 var(--sans); letter-spacing: .1em; text-transform: uppercase; transition: background-color .25s, color .25s;
}
.btn-block { width: 100%; }
.btn-walnut { background: var(--walnut); color: #fff; }
.btn-walnut:hover { background: var(--walnut-deep); color: #fff; }
.btn-text { padding-left: 0; padding-right: 0; color: var(--char); border-bottom: 1px solid var(--char); min-height: 44px; }
.btn-text:hover { color: var(--walnut); border-color: var(--walnut); }
.btn-light { background: var(--white); color: var(--char); }
.btn-light:hover { background: var(--oak); }
.link-btn { padding: 0; border: 0; background: none; cursor: pointer; font: 500 1rem var(--sans); color: var(--walnut); text-decoration: underline; text-underline-offset: 4px; }

/* ---- Header ---- */
.site-header { position: sticky; top: 0; z-index: 40; background: rgba(251, 250, 247, .95); border-bottom: 1px solid var(--line); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--char); }
.logo-mark { width: 38px; height: 38px; color: var(--walnut); }
.logo > span { display: flex; flex-direction: column; font: 600 1.45rem/1 var(--serif); letter-spacing: .04em; }
.logo small { margin-top: 4px; font: 400 .64rem var(--sans); letter-spacing: .24em; text-transform: uppercase; color: var(--muted); }
.menu-btn {
  display: none; align-items: center; gap: 12px; min-height: 44px; padding: 0 4px; border: 0; background: none; cursor: pointer;
  font: 500 .78rem var(--sans); letter-spacing: .2em; text-transform: uppercase; color: var(--char);
}
.menu-lines { position: relative; width: 26px; height: 9px; border-top: 1px solid var(--char); border-bottom: 1px solid var(--char); transition: transform .25s; }
.nav-open .menu-lines { height: 1px; border-bottom: 0; transform: rotate(-45deg); }
.nav ul { display: flex; flex-wrap: wrap; gap: 0 6px; margin: 0; padding: 0; list-style: none; }
.nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 8px; text-decoration: none; color: var(--char); font-size: .88rem; font-weight: 400; }
.nav a:hover { color: var(--walnut); }
.nav-cta { display: none; }
.js .menu-btn { display: inline-flex; }
.js .nav { display: none; }
.js .nav-open .nav {
  position: absolute; left: 0; right: 0; top: 100%; display: flex; flex-direction: column; gap: 26px;
  height: calc(100vh - 70px); height: calc(100dvh - 70px); padding: 30px 22px 120px; overflow-y: auto; background: var(--bone);
}
.js .nav-open .nav ul { flex-direction: column; }
.js .nav-open .nav a { font: 400 2rem/1.2 var(--serif); padding: 10px 0; border-bottom: 1px solid var(--line); width: 100%; }
.js .nav-open .nav-cta { display: inline-flex; }

/* ---- Hero ---- */
.hero { padding: 46px 0 0; }
.hero-grid { display: grid; gap: 40px; align-items: center; }
.lead { max-width: 33em; font-size: 1.06rem; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 30px; margin-top: 30px; }
.hero-figure { margin: 0; padding: 22px; background: var(--bone); }
.iso { display: block; width: 100%; height: auto; }
.iso-floor path { fill: #ebe4d8; stroke: var(--char); stroke-width: 1; }
.iso-wall-l path { fill: #f7f4ee; stroke: var(--char); stroke-width: 1; }
.iso-wall-r path { fill: #efeae2; stroke: var(--char); stroke-width: 1; }
.iso-line path { fill: none; stroke: var(--char); stroke-width: 1; }
.iso-wood path { fill: var(--oak); stroke: var(--char); stroke-width: 1; }
.iso-sofa path { fill: #d9d3c7; stroke: var(--char); stroke-width: 1; }
.iso-table ellipse, .iso-table path { fill: var(--walnut); stroke: var(--char); stroke-width: 1; }
.iso-accent { fill: var(--sage); }
.iso-dim path { fill: none; stroke: var(--walnut); stroke-width: 1; }
.iso-dim text { fill: var(--walnut); font: italic 500 17px var(--serif); }
.hero-figure figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 16px; margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--stone); font-size: .82rem; color: var(--muted); }
.hero-meta { display: grid; grid-template-columns: repeat(2, 1fr); margin: 50px auto 0; list-style: none; border-top: 1px solid var(--line); }
.hero-meta li { display: flex; flex-direction: column; padding: 22px 0; border-bottom: 1px solid var(--line); }
.hero-meta strong { font: 500 2rem/1.1 var(--serif); }
.hero-meta span { font-size: .82rem; color: var(--muted); }

/* ---- Section ---- */
.section { padding: 80px 0; }
.section-bone { background: var(--bone); }
.section-dark { background: var(--char); color: #e8e3db; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark h2 em { color: var(--oak); }
.section-dark .overline { color: #bdb6ab; }
.section-dark .overline span { color: var(--oak); border-color: #4a4743; }
.section-head { max-width: 720px; margin-bottom: 46px; }
.section-head > p:last-child { color: var(--muted); }

/* ---- Dịch vụ ---- */
.services { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--char); }
.service { display: grid; gap: 10px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.s-num { font: italic 500 1.2rem var(--serif); color: var(--walnut); }
.s-body h3 { margin-bottom: .3em; }
.s-body p { margin: 0; color: var(--muted); max-width: 30em; }
.s-price { margin: 0; display: flex; flex-direction: column; }
.s-price strong { font: 500 2rem/1.1 var(--serif); }
.s-price span { font-size: .84rem; color: var(--muted); }
.s-note { margin: 0; font-size: .86rem; color: var(--walnut); }
.s-tiers { margin: 0; padding: 0; list-style: none; }
.s-tiers li { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; border-bottom: 1px dotted var(--stone); font-size: .94rem; }
.s-tiers li:last-child { border-bottom: 0; }
.s-tiers strong { white-space: nowrap; }

.services-cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 30px; margin-top: 40px; padding: 26px 24px; background: var(--bone); }
.services-cta p { margin: 0; max-width: 34em; font: italic 500 1.35rem/1.4 var(--serif); }

/* ---- Ước tính ---- */
.estimator { display: grid; gap: 10px; }
.calc { display: grid; gap: 26px; padding: 26px 22px; background: var(--white); border: 1px solid var(--line); }
.calc-field { margin: 0; padding: 0; border: 0; min-width: 0; }
.calc-field > label, .calc-field legend { display: block; margin-bottom: 10px; padding: 0; font-size: .74rem; font-weight: 500; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }
.calc-area { display: flex; align-items: center; gap: 18px; }
.calc-area input { flex: 1; min-width: 0; height: 44px; accent-color: var(--walnut); cursor: pointer; }
.calc-area output { min-width: 84px; text-align: right; font: 500 1.8rem var(--serif); }
.calc-options { display: grid; gap: 8px; }
.opt { position: relative; display: block; cursor: pointer; }
.opt input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.opt span { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 54px; padding: 10px 16px; border: 1px solid var(--line); transition: border-color .2s, background-color .2s; }
.opt small { font-size: .84rem; color: var(--muted); text-align: right; }
.opt input:checked + span { border-color: var(--walnut); background: #f3ece4; box-shadow: inset 3px 0 0 var(--walnut); }
.opt input:focus-visible + span { outline: 2px solid var(--walnut); outline-offset: 2px; }
.calc-result { padding-top: 22px; border-top: 1px solid var(--char); }
.calc-label { margin: 0; font-size: .74rem; font-weight: 500; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); }
.calc-value { margin: 4px 0 6px; font: 500 clamp(2.2rem, 8vw, 3rem)/1.1 var(--serif); color: var(--walnut); }
.calc-note { font-size: .86rem; color: var(--muted); }

/* ---- Công trình ---- */
.projects { display: grid; gap: 40px; }
.project h3 { margin: 18px 0 .2em; }
.plan { display: grid; place-items: center; aspect-ratio: 4 / 3; padding: 20px; }
/* Ảnh công trình đã bàn giao, bản vẽ mặt bằng thu nhỏ đặt góc ảnh như tờ ghim trên bảng của kiến trúc sư */
.project-media { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: var(--bone); }
.project-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s cubic-bezier(.2, .7, .2, 1); }
.project:hover .project-photo { transform: scale(1.04); }
.project-media .plan {
  position: absolute; right: 12px; bottom: 12px; width: 36%; padding: 8px; background: rgba(251, 250, 247, .9);
  box-shadow: 0 10px 28px rgba(34, 33, 31, .22); transition: transform .5s ease;
}
.project:hover .project-media .plan { transform: translateY(-4px); }
.plan svg { width: 100%; height: 100%; }
.plan svg rect, .plan svg path, .plan svg circle { fill: none; stroke: var(--char); stroke-width: 1.4; }
.plan svg .f { fill: rgba(107, 74, 51, .18); stroke: var(--walnut); stroke-width: 1; }
.plan-a { background: linear-gradient(135deg, #efe9df, #e2d8c8); }
.plan-b { background: linear-gradient(135deg, #e9ece4, #d5dbcd); }
.plan-c { background: linear-gradient(135deg, #f1ebe6, #dcccc0); }
.project-meta { margin: 0; font-size: .9rem; color: var(--muted); }
.project-cost { margin: 6px 0 0; font: italic 500 1.25rem var(--serif); color: var(--walnut); }

/* ---- Quy trình ---- */
.timeline { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; counter-reset: step; border-left: 1px solid #4a4743; }
.timeline li { position: relative; padding: 0 0 34px 30px; counter-increment: step; }
.timeline li::before {
  content: counter(step, decimal-leading-zero); position: absolute; left: -18px; top: -2px; display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 50%; background: var(--char); border: 1px solid var(--oak); color: var(--oak); font: italic 500 1rem var(--serif);
}
.t-time { margin: 0 0 4px; font-size: .74rem; font-weight: 500; letter-spacing: .18em; text-transform: uppercase; color: var(--oak); }
.timeline h3 { margin-bottom: .25em; }
.timeline p:last-child { margin: 0; color: #c9c2b8; }

/* ---- Vật liệu & cam kết ---- */
.materials-wrap { display: grid; gap: 10px; }
.materials { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px 18px; margin: 0 0 50px; padding: 0; list-style: none; }
.materials li { display: flex; flex-direction: column; }
.materials strong { margin-top: 12px; font-size: .92rem; }
.materials small { font-size: .82rem; color: var(--muted); }
.mat { display: block; aspect-ratio: 1; border: 1px solid var(--line); }
.mat-melamine { background: repeating-linear-gradient(92deg, #d9c7ad 0 6px, #cdb898 6px 9px, #dccbb3 9px 17px); }
.mat-acrylic { background: linear-gradient(135deg, #fbfaf7 0%, #e4e2de 45%, #ffffff 50%, #d9d6d0 100%); }
.mat-veneer { background: repeating-radial-gradient(ellipse at 20% 120%, #b88d62 0 5px, #a77c52 5px 8px, #c19a70 8px 14px); }
.mat-oak { background: repeating-linear-gradient(88deg, #a87b4f 0 4px, #966b42 4px 6px, #b48659 6px 13px, #8f6239 13px 15px); }
.mat-stone { background: radial-gradient(circle at 30% 30%, #ffffff 0 2px, transparent 3px), radial-gradient(circle at 70% 60%, #bdb7ad 0 1.5px, transparent 2.5px), linear-gradient(140deg, #eeebe6, #d8d3cb); background-size: 22px 22px, 17px 17px, 100% 100%; }
.promises { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--char); }
.promises li { display: grid; grid-template-columns: 110px 1fr; gap: 16px; align-items: baseline; padding: 18px 0; border-bottom: 1px solid var(--line); }
.promises strong { font: 500 1.6rem/1.1 var(--serif); color: var(--walnut); }
.promises span { color: var(--muted); font-size: .95rem; }

/* ---- Gia chủ ---- */
.quotes { display: grid; gap: 40px; }
.quote { margin: 0; padding-left: 26px; border-left: 1px solid var(--walnut); }
.quote blockquote { margin: 0 0 14px; }
.quote blockquote p { margin: 0; font: italic 400 clamp(1.4rem, 4vw, 1.85rem)/1.4 var(--serif); }
.quote figcaption { font-size: .86rem; letter-spacing: .06em; color: var(--muted); }

/* ---- Hỏi đáp ---- */
.faq-grid { display: grid; gap: 10px; }
.faq { border-top: 1px solid var(--char); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 64px; padding: 16px 0;
  cursor: pointer; list-style: none; font: 500 1.35rem/1.3 var(--serif);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; flex: none; width: 12px; height: 12px; border-right: 1px solid var(--char); border-bottom: 1px solid var(--char); transform: rotate(45deg) translateY(-4px); transition: transform .25s; }
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.faq details p { margin: 0 0 22px; color: var(--muted); max-width: 44em; }

/* ---- Liên hệ ---- */
.contact { padding: 80px 0; background: var(--walnut-deep); color: #f1e9df; }
.contact h2 { color: #fff; }
.contact h2 em { color: var(--oak); }
.contact .overline { color: #e1d4c4; }
.contact .overline span { color: var(--oak); border-color: rgba(255, 255, 255, .25); }
.contact-grid { display: grid; gap: 40px; }
.contact-lead { max-width: 28em; color: #e1d4c4; }
.contact-list { font-style: normal; border-top: 1px solid rgba(255, 255, 255, .3); }
.contact-list p { display: flex; flex-direction: column; margin: 0; padding: 16px 0; border-bottom: 1px solid rgba(255, 255, 255, .18); }
.contact-list a { color: #fff; }
.contact :focus-visible { outline-color: #fff; }
.lbl { font-size: .7rem; font-weight: 500; letter-spacing: .22em; text-transform: uppercase; color: var(--oak); }

/* ---- Footer ---- */
.site-footer { padding: 34px 0 110px; background: var(--char); color: #bdb6ab; font-size: .86rem; }
.site-footer a { color: #fff; }
.footer-logo { display: flex; flex-direction: column; font: 600 1.4rem/1 var(--serif); color: #fff; }
.footer-logo span { margin-top: 4px; font: 400 .62rem var(--sans); letter-spacing: .24em; text-transform: uppercase; color: #bdb6ab; }
.footer-note { margin: 0; color: #9d968c; }

/* ---- Màn hình lớn ---- */
@media (min-width: 720px) {
  .hero-meta { grid-template-columns: repeat(4, 1fr); }
  .hero-meta li { padding-right: 20px; }
  .service { grid-template-columns: 60px 1.3fr 1fr; gap: 10px 30px; align-items: start; }
  .service .s-note { grid-column: 3; }
  .projects { grid-template-columns: repeat(3, 1fr); gap: 28px; }
  .materials { grid-template-columns: repeat(5, 1fr); }
  .quotes { grid-template-columns: 1fr 1fr; gap: 50px; }
  .timeline { grid-template-columns: repeat(2, 1fr); border-left: 0; gap: 0 40px; }
  .timeline li { padding: 30px 0 34px; border-top: 1px solid #4a4743; }
  .timeline li::before { position: static; margin-bottom: 18px; }
}
@media (min-width: 1040px) {
  .js .menu-btn { display: none; }
  .nav, .js .nav { display: flex; align-items: center; gap: 20px; }
  .nav-cta { display: inline-flex; min-height: 44px; padding: 8px 18px; font-size: .78rem; }
  .header-row { min-height: 84px; }
  .hero { padding-top: 80px; }
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 70px; }
  .section, .contact { padding: 120px 0; }
  .timeline { grid-template-columns: repeat(3, 1fr); }
  .estimator { grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: start; }
  .calc { padding: 36px; }
  .materials-wrap { grid-template-columns: .8fr 1.2fr; gap: 0 70px; }
  .materials-wrap .section-head { grid-row: span 2; }
  .faq-grid { grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: start; }
  .contact-grid { grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
  .site-footer { padding-bottom: 34px; }
  .footer-row { display: grid; grid-template-columns: auto 1fr auto; gap: 40px; align-items: center; }
  .footer-row p { margin: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .opt span, .menu-lines, .faq summary::after { transition: none; }
}

/* Ảnh thật phòng khách */
.hero-figure .hero-photo { display: block; width: 100%; height: auto; aspect-ratio: 520 / 490; object-fit: cover; }
.hero h1 em { white-space: nowrap; }