/* =========================================================================
   VINAWELL — assets/css/main.css
   BỘ KHUNG (skeleton). Token thiết kế lấy cảm hứng từ MẪU LÕI KHOAN ĐỊA CHẤT:
   càng cuộn xuống trang, tông màu càng "đi sâu vào lòng đất" (từ đất mặt sáng
   ở header → đá gốc tối ở footer). Đây là "chữ ký" hình ảnh xuyên suốt site.
   ========================================================================= */

/* ---------- 1. DESIGN TOKENS ------------------------------------------- */
:root {
	/* Màu — bảng "địa tầng" */
	--ink:          #1C1A16; /* than đen ấm, gần basalt */
	--ink-soft:     #40392F;
	--paper:        #ECE7DA; /* trầm tích nhạt (không dùng cream #F4F1EA mặc định) */
	--paper-tint:   #E2DAC5; /* dải đất sét — nền section xen kẽ */
	--slate:        #2E4A5C; /* xanh xám thép/khoan — màu chủ đạo */
	--slate-dark:   #1F323E;
	--rust:         #B94A24; /* gỉ sắt ống khoan — accent CTA */
	--rust-dark:    #8F3818;
	--ochre:        #9C7A3D; /* đất hoàng thổ — số liệu/nhấn phụ */
	--line:         #CFC7B4; /* hairline */
	--bedrock:      #14212A; /* đá gốc — nền footer/strata đáy */

	/* Typography */
	--font-display: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
	--font-body:    'Inter', 'Helvetica Neue', Arial, sans-serif;
	--font-mono:    'IBM Plex Mono', 'Courier New', monospace;

	/* Layout */
	--container-w: 1240px;
	--header-h: 108px;
	--header-h-scrolled: 76px;
	--topbar-h: 38px;
	--strata-h: 10px;
	--radius: 4px;
	--ease: cubic-bezier(.4,0,.2,1);
}

/* ---------- 2. RESET / BASE --------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h-scrolled) + var(--strata-h) + 60px); }
body {
	margin: 0;
	background: var(--paper);
	color: var(--ink);
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font: inherit; cursor: pointer; }

h1, h2, h3, h4, .h2 {
	font-family: var(--font-display);
	font-weight: 600;
	line-height: 1.15;
	margin: 0 0 .5em;
	color: var(--slate-dark);
	letter-spacing: -.01em;
}
h1, .h1 { font-size: clamp(2rem, 4vw, 3.25rem); }
h2, .h2 { font-size: clamp(1.5rem, 2.6vw, 2.25rem); }

.screen-reader-text {
	position: absolute; width: 1px; height: 1px; overflow: hidden;
	clip: rect(1px,1px,1px,1px); white-space: nowrap;
}
.skip-link {
	position: fixed; top: -60px; left: 0; z-index: 999; background: var(--rust); color: #fff;
	padding: .75em 1.25em; transition: top .2s var(--ease);
}
.skip-link:focus { top: 0; width: auto; height: auto; clip: auto; }

.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }

.section { padding: clamp(48px, 6vw, 96px) 0; }
.section--flush { padding: 0; }
.section--tint { background: var(--paper-tint); }

/* ---------- 3. STRATA BAND (chữ ký hình ảnh) ---------------------------- */
.strata-band {
	height: var(--strata-h);
	width: 100%;
	position: relative;
	display: flex;
	align-items: center;
	justify-content: flex-end;
	padding-right: 16px;
}
.strata-band--top {
	background: linear-gradient(90deg, var(--paper-tint) 0%, var(--ochre) 35%, var(--slate) 70%, var(--rust) 100%);
}
.strata-band--bottom {
	background: linear-gradient(90deg, var(--rust-dark) 0%, var(--slate-dark) 45%, var(--bedrock) 100%);
}
.strata-band__depth {
	font-family: var(--font-mono);
	font-size: 11px;
	color: rgba(255,255,255,.85);
	background: rgba(0,0,0,.25);
	padding: 1px 6px;
	border-radius: 2px;
	letter-spacing: .04em;
}

/* ---------- 4. HEADER ---------------------------------------------------- */
.site-header { position: sticky; top: 0; z-index: 100; }

.topbar {
	background: var(--slate-dark);
	color: #E8E4D8;
	height: var(--topbar-h);
	font-size: 13px;
	overflow: hidden;
	transition: height .25s var(--ease), opacity .25s var(--ease);
}
.topbar__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.topbar__contact { display: flex; gap: 20px; }
.topbar__link { display: inline-flex; align-items: center; gap: 6px; opacity: .9; transition: opacity .2s; }
.topbar__link:hover { opacity: 1; color: #fff; }
.topbar__lang { display: flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 12px; }
.lang-btn { background: none; border: none; color: inherit; opacity: .6; padding: 2px 4px; }
.lang-btn.is-active { opacity: 1; font-weight: 600; color: #fff; }
.lang-sep { opacity: .4; }

.header-main {
	background: var(--paper);
	border-bottom: 1px solid var(--line);
	height: var(--header-h);
	display: flex;
	align-items: center;
	transition: height .25s var(--ease), box-shadow .25s var(--ease);
}
.header-main__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }

/* .is-scrolled: gắn bằng JS khi cuộn > 60px — header tự co nhỏ + đổ bóng, ẩn topbar */
.site-header.is-scrolled .topbar { height: 0; opacity: 0; }
.site-header.is-scrolled .header-main { height: var(--header-h-scrolled); box-shadow: 0 4px 16px rgba(20,30,20,.08); }

.site-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.site-logo__mark {
	width: 44px; height: 44px; border-radius: var(--radius);
	border: 1.5px dashed var(--line);
	background: repeating-linear-gradient(180deg, var(--paper-tint) 0 6px, var(--paper) 6px 12px);
	flex-shrink: 0;
}
.site-logo__text {
	font-family: var(--font-display); font-weight: 700; font-size: 20px; letter-spacing: -.01em;
	color: var(--slate-dark); line-height: 1.1;
}
.site-logo__text-sub { display: block; font-size: 11px; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; color: var(--ochre); }

.main-nav .nav-menu { display: flex; align-items: center; gap: 4px; }
.main-nav .nav-menu > li { position: relative; }
.main-nav .nav-menu > li > a {
	display: block; padding: 10px 14px; font-weight: 500; font-size: 15px; color: var(--ink-soft);
	border-radius: var(--radius); transition: color .2s, background .2s;
}
.main-nav .nav-menu > li > a:hover { color: var(--slate-dark); background: var(--paper-tint); }
.main-nav .menu-item-has-children > a::after { content: '▾'; font-size: 10px; margin-left: 5px; opacity: .6; }
.main-nav .sub-menu {
	position: absolute; top: 100%; left: 0; min-width: 240px;
	background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
	box-shadow: 0 12px 28px rgba(20,30,20,.12);
	opacity: 0; visibility: hidden; transform: translateY(6px);
	transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
	padding: 6px;
}
.main-nav .menu-item-has-children:hover .sub-menu,
.main-nav .menu-item-has-children:focus-within .sub-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.main-nav .sub-menu a { display: block; padding: 9px 12px; font-size: 14px; border-radius: var(--radius); color: var(--ink-soft); }
.main-nav .sub-menu a:hover { background: var(--paper-tint); color: var(--rust); }

.header-main__actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }

/* Buttons */
.btn {
	display: inline-flex; align-items: center; justify-content: center; gap: 8px;
	padding: 12px 22px; border-radius: var(--radius); font-weight: 600; font-size: 14.5px;
	border: 1.5px solid transparent; transition: transform .15s var(--ease), background .2s, box-shadow .2s;
	white-space: nowrap;
}
.btn--rust { background: var(--rust); color: #fff; }
.btn--rust:hover { background: var(--rust-dark); box-shadow: 0 6px 16px rgba(185,74,36,.28); }
.btn--outline { border-color: var(--slate); color: var(--slate-dark); }
.btn--outline:hover { background: var(--slate); color: #fff; }
.btn--block { width: 100%; }
.btn--sm { padding: 8px 14px; font-size: 13px; }

/* Pulse — nút hotline, nhấp nháy nhịp tim, nhẹ nhàng không gây khó chịu */
@keyframes vinawell-pulse {
	0%   { box-shadow: 0 0 0 0 rgba(185,74,36,.45); }
	70%  { box-shadow: 0 0 0 14px rgba(185,74,36,0); }
	100% { box-shadow: 0 0 0 0 rgba(185,74,36,0); }
}
.btn-pulse { animation: vinawell-pulse 2.4s ease-out infinite; }

/* Hamburger (mobile) */
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; padding: 6px; }
.hamburger__line { width: 22px; height: 2px; background: var(--slate-dark); border-radius: 2px; transition: transform .25s var(--ease), opacity .25s; }
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
	position: fixed; top: 0; right: 0; height: 100%; width: min(320px, 86vw); z-index: 210;
	background: var(--paper); box-shadow: -12px 0 32px rgba(0,0,0,.18);
	padding: 20px; transform: translateX(100%); transition: transform .3s var(--ease);
	overflow-y: auto;
}
.mobile-nav.is-open { transform: translateX(0); }
.mobile-nav__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.mobile-nav__close { background: none; border: none; font-size: 26px; line-height: 1; color: var(--ink-soft); }
.mobile-nav nav .nav-menu { flex-direction: column; align-items: stretch; gap: 2px; margin-bottom: 18px; }
.mobile-nav .sub-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding-left: 12px; }
.mobile-nav__overlay {
	position: fixed; inset: 0; z-index: 205; background: rgba(20,30,26,.45);
	opacity: 0; visibility: hidden; transition: opacity .25s var(--ease), visibility .25s;
}
.mobile-nav__overlay.is-open { opacity: 1; visibility: visible; }

@media (max-width: 860px) {
	.main-nav { display: none; }
	.header-main__actions .btn--rust { display: none; }
	.hamburger { display: inline-flex; }
	.topbar__contact { gap: 12px; }
	.topbar__link span:last-child { display: none; }
}

/* ---------- 5. SKELETON PLACEHOLDER BLOCKS ------------------------------- */
.skeleton-block {
	border: 1.5px dashed var(--line);
	border-radius: var(--radius);
	background: repeating-linear-gradient(135deg, rgba(46,74,92,.035) 0 10px, transparent 10px 20px);
	padding: 22px 20px;
	display: flex; flex-direction: column; gap: 6px;
	min-height: 96px;
	justify-content: center;
}
.skeleton-block--tall { min-height: min(70vh, 560px); }
.skeleton-block__label { font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--slate); text-transform: uppercase; letter-spacing: .04em; }
.skeleton-block__note { font-size: 13.5px; color: var(--ink-soft); opacity: .75; }

/* ---------- 6. STATS / COUNT-UP ------------------------------------------ */
.stats-band { background: linear-gradient(120deg, var(--slate-dark), var(--slate)); color: #fff; }
.count-up-group { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.count-up-item { min-height: 110px; border-color: rgba(255,255,255,.28); background: rgba(255,255,255,.04); }
.stats-band .skeleton-block__label { color: #fff; }
.stats-band .skeleton-block__note { color: rgba(255,255,255,.75); }
.count-up-item .count-up-value { font-family: var(--font-mono); font-size: 2.2rem; font-weight: 600; color: var(--ochre); }
@media (max-width: 860px) { .count-up-group { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 7. SERVICE / PROJECT / PRODUCT CARDS -------------------------- */
.service-card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.service-card-grid--2col { grid-template-columns: repeat(2, 1fr); }
.service-card { min-height: 220px; }
@media (max-width: 1024px) { .service-card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .service-card-grid, .service-card-grid--2col { grid-template-columns: 1fr; } }

.project-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.project-card-grid--wide { grid-template-columns: repeat(3, 1fr); }
.project-card { min-height: 200px; }
@media (max-width: 860px) { .project-card-grid, .project-card-grid--wide { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .project-card-grid, .project-card-grid--wide { grid-template-columns: 1fr; } }

.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 24px; }
.product-card { min-height: 180px; transition: transform .2s var(--ease), box-shadow .2s var(--ease); align-items: flex-start; }
.product-card:hover { transform: scale(1.02); box-shadow: 0 10px 24px rgba(20,30,20,.10); border-style: solid; }
@media (max-width: 1024px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .product-grid { grid-template-columns: 1fr; } }

.contact-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 32px; }
.contact-card { min-height: 100px; }
@media (max-width: 760px) { .contact-cards { grid-template-columns: 1fr; } }

/* ---------- 8. FILTER (bộ lọc sản phẩm / dự án) --------------------------- */
.product-filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 8px; }
.filter-btn {
	background: #fff; border: 1.5px solid var(--line); color: var(--ink-soft);
	padding: 9px 18px; border-radius: 999px; font-size: 13.5px; font-weight: 500;
	transition: transform .18s var(--ease), background .2s, color .2s, border-color .2s;
}
.filter-btn:hover { transform: scale(1.02); border-color: var(--ochre); }
.filter-btn.is-active { background: var(--slate-dark); border-color: var(--slate-dark); color: #fff; }
/* Trạng thái ẩn khi filter (JS toggle .is-hidden) — transition mượt, không giật layout */
.is-filter-hidden { opacity: 0; transform: scale(.96); pointer-events: none; position: absolute; visibility: hidden; }
[data-filter-item] { transition: opacity .25s var(--ease), transform .25s var(--ease); }

/* ---------- 9. SERVICE TABS (sticky) --------------------------------------- */
.service-tabs {
	position: sticky; top: var(--header-h-scrolled); z-index: 50;
	background: rgba(236,231,218,.94); backdrop-filter: blur(6px);
	border-bottom: 1px solid var(--line);
}
.service-tabs__inner { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.service-tabs__inner::-webkit-scrollbar { display: none; }
.service-tab {
	padding: 16px 18px; font-weight: 500; font-size: 14.5px; color: var(--ink-soft);
	border-bottom: 2.5px solid transparent; white-space: nowrap; transition: color .2s, border-color .2s;
}
.service-tab:hover, .service-tab.is-active { color: var(--rust); border-color: var(--rust); }

/* ---------- 10. PROCESS TRACK (quy trình 7 bước) --------------------------- */
.process-track { display: grid; grid-template-columns: repeat(7, 1fr); gap: 12px; }
.process-step { min-height: 150px; align-items: flex-start; }
.process-step__num { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 600; color: var(--rust); }
@media (max-width: 1024px) { .process-track { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 640px) { .process-track { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 11. SERVICE DETAIL (trang Dịch vụ) ------------------------------ */
.service-detail__inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.service-detail--reverse .service-detail__inner { direction: rtl; }
.service-detail--reverse .service-detail__inner > * { direction: ltr; }
.service-detail__media { min-height: 320px; }
.service-detail__content > .skeleton-block { margin-bottom: 14px; }
@media (max-width: 860px) { .service-detail__inner { grid-template-columns: 1fr; } .service-detail--reverse .service-detail__inner { direction: ltr; } }

/* ---------- 12. FORM SPLIT / CTA STRIP -------------------------------------- */
.form-split { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.form-split__form, .form-split__map { min-height: 340px; }
@media (max-width: 860px) { .form-split { grid-template-columns: 1fr; } }

.cta-strip { background: var(--slate-dark); padding: 40px 0; }
.cta-strip__inner { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-strip .btn--outline { border-color: rgba(255,255,255,.5); color: #fff; }
.cta-strip .btn--outline:hover { background: rgba(255,255,255,.12); }

.page-banner { background: var(--slate-dark); padding: 56px 0; }
.page-banner__inner { min-height: 140px; border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.04); }
.page-banner .skeleton-block__label { color: #fff; }
.page-banner .skeleton-block__note { color: rgba(255,255,255,.7); }

/* ---------- 13. FOOTER ------------------------------------------------------- */
.site-footer { background: var(--bedrock); color: #D9D4C4; padding-top: 40px; }
.footer-legal { font-size: 12.5px; opacity: .65; line-height: 1.7; padding-bottom: 24px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; padding: 36px 0; }
.footer-col__title { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col__slogan { font-size: 13.5px; opacity: .75; margin: 12px 0; max-width: 34ch; }
.footer-menu li { margin-bottom: 9px; }
.footer-menu a, .footer-contact-list a { opacity: .8; font-size: 14px; transition: opacity .2s, color .2s; }
.footer-menu a:hover, .footer-contact-list a:hover { opacity: 1; color: var(--ochre); }
.footer-contact-list li { margin-bottom: 9px; font-size: 14px; opacity: .85; }
.site-logo--footer .site-logo__text { color: #fff; }
.site-logo--footer .site-logo__text-sub { color: var(--ochre); }
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.social-icon {
	width: 34px; height: 34px; border-radius: 50%; border: 1px solid rgba(255,255,255,.25);
	display: flex; align-items: center; justify-content: center; font-size: 11px; font-family: var(--font-mono);
	transition: background .2s, border-color .2s;
}
.social-icon:hover { background: var(--rust); border-color: var(--rust); }
.footer-bottom { padding: 18px 0 28px; font-size: 12.5px; opacity: .55; text-align: center; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---------- 14. FLOATING WIDGETS -------------------------------------------- */
.floating-widgets {
	position: fixed; right: 20px; bottom: 20px; z-index: 150;
	display: flex; flex-direction: column; gap: 12px; align-items: center;
}
.fab {
	width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
	background: var(--slate-dark); color: #fff; border: none; box-shadow: 0 8px 20px rgba(20,30,20,.25);
	transition: transform .2s var(--ease);
}
.fab:hover { transform: translateY(-3px); }
.fab--zalo { background: #0068FF; }
.fab--hotline { background: var(--rust); }
.fab--top { background: #fff; color: var(--slate-dark); border: 1.5px solid var(--line); opacity: 0; visibility: hidden; transform: translateY(10px); }
.fab--top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.icon { display: inline-block; width: 18px; height: 18px; }

/* ---------- 15. HOTSPOT / TOOLTIP (địa tầng, thiết bị) ----------------------- */
.hotspot {
	position: relative; width: 14px; height: 14px; border-radius: 50%;
	background: var(--rust); border: 2px solid #fff; box-shadow: 0 0 0 3px rgba(185,74,36,.35);
	cursor: pointer;
}
.hotspot-tooltip {
	position: absolute; bottom: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(4px);
	background: var(--slate-dark); color: #fff; padding: 10px 14px; border-radius: var(--radius);
	font-size: 13px; white-space: nowrap; box-shadow: 0 10px 24px rgba(0,0,0,.22);
	opacity: 0; visibility: hidden; transition: opacity .18s var(--ease), transform .18s var(--ease);
	pointer-events: none;
}
.hotspot.is-active .hotspot-tooltip { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ---------- 16. AOS override (giảm khoảng cách trượt mặc định cho tinh tế) --- */
[data-aos] { transition-timing-function: var(--ease) !important; }

/* ---------- 17. REDUCED MOTION ---------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
	.btn-pulse { animation: none; }
}