/* ============================================================
   Bình An – Landing page styles
   Bảng màu: xanh dương đậm, xanh cyan, trắng, xám nhạt
   ============================================================ */

:root {
  --navy: #0a2540;        /* xanh dương đậm */
  --navy-700: #123a63;
  --blue: #1565d8;        /* xanh dương */
  --cyan: #06b6d4;        /* xanh cyan */
  --cyan-soft: #e0f7fb;
  --white: #ffffff;
  --gray-50: #f5f7fa;     /* xám nhạt */
  --gray-100: #eef2f7;
  --gray-200: #e2e8f0;
  --gray-500: #64748b;
  --gray-700: #334155;
  --text: #1b2733;

  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(10, 37, 64, 0.08);
  --shadow-hover: 0 18px 40px rgba(10, 37, 64, 0.16);
  --container: 1160px;
  --transition: 0.25s ease;
}

/* ---------- Reset cơ bản ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { line-height: 1.25; color: var(--navy); margin: 0 0 .5rem; }
h1 { font-size: clamp(1.9rem, 4.2vw, 3rem); font-weight: 800; letter-spacing: -.5px; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; }
p  { margin: 0 0 1rem; color: var(--gray-700); }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 820px; }
.section { padding: 72px 0; }
.section-alt { background: var(--gray-50); border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200); }
.section-head { text-align: center; max-width: 700px; margin: 0 auto 44px; }
.section-sub { color: var(--gray-500); font-size: 1.05rem; }
.eyebrow {
  display: inline-block;
  text-transform: uppercase; letter-spacing: 1.2px; font-size: .76rem;
  font-weight: 700; color: #0e6b80; margin-bottom: .9rem;
  background: var(--cyan-soft); padding: .35rem .85rem; border-radius: 999px;
  border: 1px solid #b6e9f1;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 1100;
  background: var(--navy); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem; justify-content: center;
  padding: .8rem 1.4rem; border-radius: 999px; font-weight: 600; font-size: .98rem;
  cursor: pointer; border: 2px solid transparent; transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: linear-gradient(120deg, var(--blue), var(--cyan)); color: #fff; box-shadow: 0 8px 20px rgba(21, 101, 216, .28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(21, 101, 216, .38); }
.btn-outline { background: transparent; color: var(--navy); border-color: var(--gray-200); }
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 255, 255, .9); backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: 0 2px 12px rgba(10, 37, 64, .06);
}
.header-inner { display: flex; align-items: center; gap: 1.2rem; height: 84px; }
.logo { display: inline-flex; align-items: center; gap: .6rem; font-weight: 800; color: var(--navy); font-size: 1.25rem; }
.logo-img { height: 60px; width: auto; display: block; }
.logo-mark {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--navy), var(--cyan)); color: #fff; font-size: .9rem; font-weight: 800;
}
.main-nav { margin-left: auto; }
.main-nav ul { display: flex; align-items: center; gap: 1.3rem; }
.main-nav > ul > li { display: flex; align-items: center; }
.main-nav a { color: var(--gray-700); font-weight: 500; font-size: .95rem; position: relative; padding: 4px 0; }
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--cyan); transition: width var(--transition);
}
.main-nav a:hover { color: var(--navy); }
.main-nav a:hover::after { width: 100%; }
.header-cta { padding: .6rem 1.1rem; }

/* ---------- Dropdown menu "Dịch vụ" ---------- */
.has-dropdown { position: relative; }
.has-dropdown > a { display: inline-flex; align-items: center; gap: .3rem; }
.caret {
  display: inline-block; width: .55em; height: .55em; margin-top: -2px;
  border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg); transition: transform var(--transition); opacity: .65;
}
.has-dropdown:hover > a .caret,
.has-dropdown:focus-within > a .caret { transform: rotate(-135deg); margin-top: 2px; opacity: 1; }
.dropdown {
  position: absolute; top: calc(100% + 12px); left: 50%; transform: translate(-50%, 8px);
  min-width: 240px; max-width: 280px;
  background: #fff; border: 1px solid var(--gray-200); border-radius: 12px;
  box-shadow: 0 12px 32px rgba(10, 37, 64, .14); padding: 6px; display: flex; flex-direction: column; gap: 1px;
  opacity: 0; visibility: hidden;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 1001;
}
.has-dropdown:hover > .dropdown,
.has-dropdown:focus-within > .dropdown { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.dropdown::before { /* mũi tên nhỏ trỏ lên + vùng đệm rê chuột */
  content: ""; position: absolute; top: -16px; left: 0; right: 0; height: 16px;
}
.dropdown::after {
  content: ""; position: absolute; top: -6px; left: 50%; transform: translateX(-50%) rotate(45deg);
  width: 12px; height: 12px; background: #fff; border-left: 1px solid var(--gray-200); border-top: 1px solid var(--gray-200);
}
.dropdown li { width: 100%; }
.dropdown a {
  display: block; padding: 9px 12px; border-radius: 8px; font-size: .9rem; font-weight: 500;
  line-height: 1.35; color: var(--gray-700); transition: background var(--transition), color var(--transition);
}
.dropdown a::after { display: none; }
.dropdown a:hover { background: var(--cyan-soft); color: var(--navy); }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: 0;
  cursor: pointer; padding: 8px; margin-left: auto;
}
.menu-toggle span { width: 26px; height: 3px; background: var(--navy); border-radius: 3px; transition: var(--transition); }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Breadcrumb ---------- */
.breadcrumb { background: var(--gray-100); border-bottom: 1px solid var(--gray-200); font-size: .88rem; }
.breadcrumb ol { margin: 0; display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; min-height: 44px; padding: 8px 0; color: var(--gray-500); line-height: 1.4; }
.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li::after { content: "›"; margin-left: .5rem; color: var(--gray-500); font-size: 1.1em; line-height: 1; }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb li[aria-current="page"] { color: var(--navy); font-weight: 600; }
.breadcrumb a { color: var(--gray-700); }
.breadcrumb a:hover { color: var(--blue); }

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1200px 500px at 80% -10%, rgba(6,182,212,.15), transparent 60%),
              linear-gradient(180deg, #f8fbff, #ffffff);
  padding: 56px 0 64px;
}
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero-desc { font-size: 1.1rem; max-width: 560px; }
.hero-cta { display: flex; gap: .9rem; flex-wrap: wrap; margin: 1.6rem 0 1.4rem; }
.hero-points { display: flex; flex-direction: column; gap: .5rem; }
.hero-points li { display: flex; align-items: center; gap: .6rem; font-weight: 500; color: var(--gray-700); }
.hero-points span {
  width: 24px; height: 24px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff;
  display: grid; place-items: center; font-weight: 800; font-size: .78rem; flex: none;
  box-shadow: 0 3px 8px rgba(21, 101, 216, .3);
}
.hero-media img {
  width: 100%; border-radius: 20px; box-shadow: var(--shadow);
  object-fit: cover; aspect-ratio: 4/3; background: var(--gray-100);
}

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

/* ---------- Cards ---------- */
.card {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(10, 37, 64, .06);
  overflow: hidden; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--cyan); }
.card-media { overflow: hidden; aspect-ratio: 16/10; background: var(--gray-100); }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.card:hover .card-media img { transform: scale(1.06); }
.card-body { padding: 22px; }
.card-icon {
  width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--navy), var(--cyan)); font-size: 1.5rem;
  margin-bottom: .8rem; box-shadow: 0 6px 14px rgba(10, 37, 64, .18);
}
.service-card p { font-size: .96rem; }
.card-link { font-weight: 700; color: var(--blue); display: inline-block; margin-top: .4rem; transition: gap var(--transition); }
.card-link:hover { color: var(--navy); }

.project-card img { aspect-ratio: 16/9; object-fit: cover; background: var(--gray-100); }

/* ---------- Process ---------- */
.process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; counter-reset: step; }
.process-step {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(10, 37, 64, .06);
  padding: 26px 18px; text-align: center; position: relative; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.process-step:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--cyan); }
.process-num {
  width: 46px; height: 46px; border-radius: 50%; margin: 0 auto 12px;
  display: grid; place-items: center; font-weight: 800; color: #fff; font-size: 1.1rem;
  background: linear-gradient(135deg, var(--navy), var(--cyan));
}
.process-step h3 { font-size: 1rem; }
.process-step p { font-size: .9rem; margin: 0; }

/* ---------- Features ---------- */
.feature {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  box-shadow: 0 4px 16px rgba(10, 37, 64, .06);
  padding: 26px; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  border-left: 4px solid var(--cyan);
}
.feature:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--cyan); }
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  font-size: 1.7rem; margin-bottom: .8rem; background: var(--cyan-soft); border: 1px solid #c5ecf2;
}
.feature p { margin: 0; font-size: .95rem; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-sm);
  padding: 4px 20px; transition: box-shadow var(--transition);
}
.faq-item[open] { box-shadow: var(--shadow); border-color: var(--cyan); }
.faq-item summary {
  cursor: pointer; font-weight: 600; color: var(--navy); padding: 16px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.5rem; color: var(--cyan); transition: transform var(--transition); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-answer { padding-bottom: 16px; }
.faq-answer p { margin: 0; }

/* ---------- CTA band ---------- */
.cta-band { background: linear-gradient(120deg, var(--navy), var(--navy-700)); color: #fff; padding: 50px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; margin-bottom: .3rem; }
.cta-band p { color: rgba(255,255,255,.85); margin: 0; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1.3fr .9fr; gap: 32px; align-items: start; }
.contact-form {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.form-row { margin-bottom: 16px; }
.form-row label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .92rem; color: var(--navy); }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--gray-200); border-radius: var(--radius-sm);
  font: inherit; color: var(--text); background: var(--gray-50); transition: border-color var(--transition), box-shadow var(--transition);
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(6,182,212,.18); background: #fff;
}
.form-row textarea { resize: vertical; }
.error-msg { color: #dc2626; font-size: .82rem; display: block; margin-top: 4px; min-height: 1em; }
.form-row.invalid input, .form-row.invalid select { border-color: #dc2626; }
.form-success { color: #16a34a; font-weight: 600; margin: 14px 0 0; }

.contact-info {
  background: var(--navy); color: #fff; border-radius: var(--radius); padding: 28px;
}
.contact-info h3 { color: #fff; }
.contact-list { display: flex; flex-direction: column; gap: 18px; margin-top: 16px; }
.contact-list li { display: flex; gap: 12px; align-items: flex-start; }
.contact-list span { font-size: 1.2rem; flex: none; }
.contact-list strong { color: var(--cyan); font-weight: 600; }
.contact-list a { color: #fff; }
.contact-list a:hover { color: var(--cyan); }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: rgba(255,255,255,.78); margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1.2fr 1.2fr; gap: 32px; padding: 56px 20px 40px; }
.footer-col h3 { color: #fff; font-size: 1.05rem; margin-bottom: 1rem; }
.footer-col p { color: rgba(255,255,255,.7); font-size: .95rem; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: rgba(255,255,255,.78); font-size: .95rem; }
.footer-col a:hover { color: var(--cyan); }
.logo-footer {
  display: inline-flex; align-items: center; justify-content: center; margin-bottom: 1.1rem;
  background: #fff; padding: 10px 16px; border-radius: 14px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .25); transition: transform var(--transition);
}
.logo-footer:hover { transform: translateY(-2px); }
.footer-logo-img { height: 60px; width: auto; display: block; }
.footer-contact li { display: flex; gap: 6px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 18px 0; font-size: .88rem; }
.footer-bottom p { margin: 0; color: rgba(255,255,255,.6); text-align: center; }

/* ---------- Floating call (mobile) ---------- */
.floating-call {
  position: fixed; right: 16px; bottom: 16px; z-index: 1050;
  background: linear-gradient(135deg, var(--blue), var(--cyan)); color: #fff;
  display: none; align-items: center; gap: .5rem; padding: 14px 18px; border-radius: 999px;
  font-weight: 700; box-shadow: 0 10px 26px rgba(21,101,216,.45);
  animation: pulse 2s infinite;
}
.floating-call-label { font-size: .95rem; }
@keyframes pulse {
  0%   { box-shadow: 0 10px 26px rgba(21,101,216,.45), 0 0 0 0 rgba(6,182,212,.5); }
  70%  { box-shadow: 0 10px 26px rgba(21,101,216,.45), 0 0 0 14px rgba(6,182,212,0); }
  100% { box-shadow: 0 10px 26px rgba(21,101,216,.45), 0 0 0 0 rgba(6,182,212,0); }
}

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Broken-image placeholder (chạy khi mở trực tiếp, chưa có ảnh thật) ---------- */
img.img-fallback {
  background: linear-gradient(135deg, var(--gray-100), var(--cyan-soft));
  position: relative; min-height: 120px;
}
img.img-fallback::after {
  content: attr(alt); position: absolute; inset: 0; display: grid; place-items: center;
  padding: 10px; text-align: center; font-size: .8rem; color: var(--gray-500); background: inherit;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-media { order: -1; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .header-inner { height: 80px; }
  .logo-img { height: 60px; }
  html { scroll-padding-top: 92px; }
  .header-cta { display: none; }
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed; inset: 80px 0 auto 0; background: #fff; margin: 0;
    border-bottom: 1px solid var(--gray-200); box-shadow: var(--shadow);
    transform: translateY(-120%); transition: transform var(--transition); max-height: calc(100vh - 80px); overflow-y: auto;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 0; padding: 8px 20px 16px; }
  .main-nav > ul > li { display: block; }
  .main-nav li { border-bottom: 1px solid var(--gray-100); }
  .main-nav a { display: block; padding: 14px 0; }
  .main-nav a::after { display: none; }

  /* Dropdown hiển thị inline trên mobile (không dùng hover) */
  .has-dropdown > a .caret { display: none; }
  .dropdown {
    position: static; opacity: 1; visibility: visible; transform: none;
    border: 0; box-shadow: none; padding: 0 0 8px 14px; min-width: 0; max-width: none;
  }
  .dropdown::before, .dropdown::after { display: none; }
  .dropdown li { border-bottom: 0; }
  .dropdown a { padding: 10px 0; font-size: .9rem; color: var(--gray-500); }
  .dropdown a:hover { background: none; color: var(--navy); }

  .floating-call { display: inline-flex; }
}

@media (max-width: 600px) {
  .section { padding: 52px 0; }
  .grid-3, .grid-2, .process { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; padding: 40px 20px 32px; }
  .hero-cta .btn { flex: 1 1 100%; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- Trang dịch vụ chi tiết ---------- */
.page-hero {
  background: radial-gradient(900px 400px at 85% -20%, rgba(6,182,212,.14), transparent 60%),
              linear-gradient(180deg, #f8fbff, #ffffff);
  padding: 48px 0 52px;
}
.prose p { font-size: 1.05rem; color: var(--gray-700); }
.prose + h3, .section .container-narrow h3 { margin-top: 1.6rem; color: var(--navy); }
.check-list { display: grid; gap: 12px; margin: 1rem 0 0; }
.check-list li {
  position: relative; padding-left: 34px; color: var(--gray-700); font-weight: 500;
}
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  width: 22px; height: 22px; border-radius: 50%; background: var(--cyan-soft); color: var(--cyan);
  display: grid; place-items: center; font-weight: 800; font-size: .8rem;
}

/* ---------- Giảm chuyển động khi người dùng yêu cầu ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}