/* ==========================================================================
   Discovery Airways — nền tảng độc lập
   Thay thế toàn bộ lớp dùng chung của discoverygroup.vn (sector-system,
   subpage-shell, shared-shell, spacing-system, typography-scale...). Trang này
   không còn phụ thuộc file nào của web chính.
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #fff;
}

body {
  margin: 0;
  color: var(--tb-ink);
  background: #fff;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

:root {
  --font-body: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-title: "Montserrat", var(--font-body);
  --da-header-h: 84px;
}

img, svg, video { max-width: 100%; }
img { border-style: none; }
a { color: inherit; }
button { font: inherit; }

h1, h2, h3, h4 { font-family: var(--font-title); font-weight: 600; margin: 0; }
h1 { font-size: clamp(46px, 4.5vw, 66px); line-height: 1.08; letter-spacing: -.035em; }
h2 { font-size: clamp(34px, 3.4vw, 50px); line-height: 1.1; letter-spacing: -.028em; }
h3 { font-family: var(--font-body); font-size: clamp(16px, 1.6vw, 21px); line-height: 1.25; letter-spacing: -.015em; }
p { margin: 0 0 14px; }
p:last-child { margin-bottom: 0; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* --- ô nhập liệu (trước đây do subpage-shell.css cấp) --- */
input, select, textarea {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--tb-ink);
  background: #fff;
  border: 1px solid var(--tb-line);
  border-radius: 2px;
  color-scheme: light;
}
input::placeholder, textarea::placeholder { color: #77766f; opacity: 1; }

/* ==========================================================================
   Header riêng của Discovery Airways
   ========================================================================== */
.da-header {
  position: fixed;
  z-index: 1000;
  inset: 0 0 auto 0;
  height: var(--da-header-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 40px);
  padding: 0 clamp(20px, 5.2vw, 96px);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: height .3s ease, background-color .35s ease, box-shadow .35s ease,
              transform .45s cubic-bezier(.16, 1, .3, 1), border-color .35s ease;
}
.da-header.is-solid {
  height: 68px;
  background: rgba(255, 255, 255, .97);
  border-bottom-color: var(--tb-line-soft);
  box-shadow: 0 8px 30px rgba(46, 39, 25, .08);
  backdrop-filter: blur(12px);
}
.da-header.is-hidden { transform: translateY(-102%); }

.da-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; flex: 0 0 auto; }
.da-brand i {
  width: 24px;
  height: 34px;
  background: url("assets/airways-mark.svg") center / contain no-repeat;
  transition: width .3s ease, height .3s ease;
}
.da-header.is-solid .da-brand i { width: 20px; height: 29px; }
.da-brand span { display: grid; gap: 1px; line-height: 1; }
.da-brand b {
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .13em;
  color: #fff;
  transition: color .35s ease;
}
.da-brand em {
  font-style: normal;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .38em;
  text-indent: .38em;
  color: var(--tb-gold-lt);
  transition: color .35s ease;
}
.da-header.is-solid .da-brand b { color: var(--tb-ink); }
.da-header.is-solid .da-brand em { color: var(--tb-gold); }

.da-nav { flex: 1 1 auto; display: flex; align-items: center; justify-content: center; gap: clamp(12px, 1.7vw, 30px); }
.da-nav a {
  position: relative;
  padding: 6px 0;
  text-decoration: none;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .07em;
  white-space: nowrap;
  color: rgba(255, 255, 255, .84);
  transition: color .3s ease;
}
.da-nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1.5px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .38s cubic-bezier(.16, 1, .3, 1);
}
.da-nav a:hover { color: #fff; }
.da-nav a:hover::after, .da-nav a[aria-current="page"]::after { transform: scaleX(1); }
.da-nav a[aria-current="page"] { color: var(--tb-gold-lt); font-weight: 600; }
.da-header.is-solid .da-nav a { color: var(--tb-muted); }
.da-header.is-solid .da-nav a:hover { color: var(--tb-ink); }
.da-header.is-solid .da-nav a[aria-current="page"] { color: var(--tb-gold); }

.da-cta {
  flex: 0 0 auto;
  padding: 10px 22px;
  border: 1px solid rgba(255, 255, 255, .48);
  border-radius: 999px;
  text-decoration: none;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #fff;
  white-space: nowrap;
  transition: color .35s ease, background-color .35s ease, border-color .35s ease;
}
.da-cta:hover { color: #22190a; background: var(--tb-gold-lt); border-color: var(--tb-gold-lt); }
.da-header.is-solid .da-cta { color: var(--tb-gold); border-color: var(--tb-line); }
.da-header.is-solid .da-cta:hover { color: #22190a; background: var(--tb-gold-lt); border-color: var(--tb-gold-lt); }

.da-toggle {
  display: none;
  flex: 0 0 auto;
  width: 40px; height: 40px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  position: relative;
}
.da-toggle span {
  position: absolute;
  left: 9px;
  width: 22px;
  height: 1.5px;
  background: #fff;
  transition: transform .35s cubic-bezier(.16, 1, .3, 1), opacity .25s ease, background-color .35s ease;
}
.da-toggle span:nth-child(1) { top: 14px; }
.da-toggle span:nth-child(2) { top: 20px; }
.da-toggle span:nth-child(3) { top: 26px; }
.da-header.is-solid .da-toggle span { background: var(--tb-ink); }
body.da-menu-open .da-toggle span { background: var(--tb-ink); }
/* Menu mobile phủ nền sáng: chữ thương hiệu phải đổi sang mực, nếu không sẽ
   là trắng trên trắng. */
body.da-menu-open .da-brand b { color: var(--tb-ink); }
body.da-menu-open .da-brand em { color: var(--tb-gold); }
body.da-menu-open .da-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.da-menu-open .da-toggle span:nth-child(2) { opacity: 0; }
body.da-menu-open .da-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ==========================================================================
   Footer riêng
   ========================================================================== */
.da-footer {
  position: relative;
  padding: clamp(52px, 6vw, 90px) clamp(20px, 5.2vw, 96px) clamp(26px, 3vw, 40px);
  color: rgba(238, 232, 219, .78);
  background:
    radial-gradient(110% 80% at 8% 0%, rgba(183, 149, 82, .16), transparent 58%),
    linear-gradient(168deg, #0a1420 0%, #0f1d2c 56%, #16283a 100%);
}
.da-footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: clamp(26px, 3.4vw, 62px);
  padding-bottom: clamp(30px, 3.6vw, 54px);
  border-bottom: 1px solid rgba(183, 149, 82, .22);
}
.da-footer-brand { display: grid; align-content: start; gap: 16px; }
.da-footer-brand .da-brand b { color: #fff; }
.da-footer-brand .da-brand em { color: var(--tb-gold-lt); }
.da-footer-brand p { margin: 0; font-size: 12.5px; line-height: 1.75; max-width: 34ch; }
.da-footer h4 {
  margin: 0 0 14px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--tb-gold-lt);
}
.da-footer nav { display: grid; gap: 9px; }
.da-footer nav a, .da-footer-contact a {
  text-decoration: none;
  font-size: 12.5px;
  color: rgba(238, 232, 219, .78);
  transition: color .3s ease;
}
.da-footer nav a:hover, .da-footer-contact a:hover { color: var(--tb-gold-lt); }
.da-footer-contact { display: grid; gap: 9px; }
.da-footer-contact span { display: block; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: rgba(183, 149, 82, .8); }
.da-footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: clamp(18px, 2vw, 28px);
}
.da-footer-bottom p { margin: 0; font-size: 11px; color: rgba(238, 232, 219, .56); }
.da-footer-bottom a { font-size: 11px; text-decoration: none; color: rgba(238, 232, 219, .56); transition: color .3s ease; }
.da-footer-bottom a:hover { color: var(--tb-gold-lt); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1080px) {
  .da-nav { gap: 14px; }
  .da-nav a { font-size: 11px; }
  .da-cta { display: none; }
}

@media (max-width: 900px) {
  :root { --da-header-h: 64px; }
  .da-header.is-solid { height: 58px; }
  .da-toggle { display: block; }
  .da-nav {
    position: fixed;
    inset: 0;
    z-index: -1;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 4px;
    padding: 96px clamp(24px, 7vw, 56px) 48px;
    background: linear-gradient(160deg, #fff 0%, #faf8f3 100%);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
    overflow-y: auto;
  }
  body.da-menu-open { overflow: hidden; }
  body.da-menu-open .da-nav { opacity: 1; visibility: visible; }
  body.da-menu-open .da-header { background: transparent; box-shadow: none; border-bottom-color: transparent; }
  .da-nav a {
    width: 100%;
    padding: 13px 0;
    font-family: var(--font-title);
    font-size: clamp(26px, 7vw, 36px);
    font-weight: 600;
    letter-spacing: -.02em;
    color: var(--tb-ink);
    border-bottom: 1px solid var(--tb-line-soft);
  }
  .da-nav a::after { display: none; }
  .da-nav a[aria-current="page"] { color: var(--tb-gold); }
  .da-header.is-solid .da-nav a { color: var(--tb-ink); }
  .da-footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .da-footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  body { font-size: 13px; }
  h1 { font-size: clamp(34px, 9.5vw, 44px); line-height: 1.12; }
  h2 { font-size: clamp(27px, 7.6vw, 36px); line-height: 1.14; }
  .da-footer-grid { grid-template-columns: minmax(0, 1fr); }
  .da-footer-bottom { flex-direction: column; align-items: flex-start; }
}