/* ======================================================
   DESIGN SYSTEM — CSS VARIABLES
====================================================== */
:root {
  --bg: #f6f8fd;
  --bg-soft: #edf3ff;
  --surface: #ffffff;
  --surface-alt: #f8fbff;
  --surface-strong: #e7efff;
  --ink: #0f172a;
  --muted: #4a5a78;
  --line: #dbe5f4;
  --brand: #145df6;
  --brand-strong: #0d47c7;
  --brand-soft: #eef4ff;
  --accent: #53a2ff;
  --nav-bg: rgba(255, 255, 255, 0.92);
  --shadow-sm: 0 10px 30px rgba(15, 23, 42, 0.06);
  --shadow: 0 18px 60px rgba(20, 93, 246, 0.12);
  --shadow-lg: 0 24px 70px rgba(15, 23, 42, 0.14);
  --radius-sm: 14px;
  --radius: 20px;
  --radius-lg: 28px;
  --content: 1080px;
}

/* ======================================================
   RESET & BASE
====================================================== */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Sora", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(20, 93, 246, 0.08), transparent 28%),
    radial-gradient(circle at bottom left, rgba(83, 162, 255, 0.1), transparent 32%),
    linear-gradient(180deg, #fcfdff 0%, var(--bg) 100%);
  line-height: 1.72;
  overflow-x: hidden;
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-strong); }
img { max-width: 100%; display: block; }
main { position: relative; }
.site-shell { min-height: 100vh; }

/* ======================================================
   LAYOUT — WRAP & GRIDS
====================================================== */
.wrap {
  width: min(calc(100% - 2rem), var(--content));
  margin: 0 auto;
}

/* 2 cột: main content + sidebar */
.hero-grid,
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(290px, 0.75fr);
  gap: 1.5rem;
  align-items: start;
}

.cards-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.cards-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.deal-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.blog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.media-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.media-grid.two-up { grid-template-columns: 1fr; }
/* ======================================================
.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1.25rem;
}

section {
  padding: 2.5rem 0 2.5rem 0;
  margin-bottom: 0.5rem;
  background: linear-gradient(90deg, #f8fbff 0%, #eef4ff 100%);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 24px rgba(20,93,246,0.04);
  margin-top: 2.2rem;
}

/* ======================================================
   HEADER & NAVIGATION
====================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.07);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 62px;
  padding: 0.65rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.brand strong { color: var(--brand); }

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
}

.nav-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.18s ease, color 0.18s ease;
}

.nav-list a:hover,
.nav-list a.active {
  background: var(--brand-soft);
  color: var(--brand);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 8px 26px rgba(20, 93, 246, 0.28);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.nav-cta:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 14px 34px rgba(20, 93, 246, 0.34);
}

/* ======================================================
   TYPOGRAPHY
====================================================== */
h1, h2, h3 {
  line-height: 1.14;
  letter-spacing: -0.03em;
  margin: 0 0 0.8rem;
}

h1 { font-size: clamp(2.15rem, 5vw, 3.75rem); max-width: 12ch; }
h2, .section-title { font-size: clamp(1.5rem, 3vw, 2.18rem); }
h3 { font-size: 1.08rem; }
p, li, td, th { font-size: 0.96rem; }
p { margin: 0 0 1rem; color: var(--ink); }
li { color: var(--ink); }
.lede { font-size: 1.02rem; color: var(--muted); max-width: 68ch; }
.muted { color: var(--muted); }
.small { font-size: 0.84rem; }

/* ======================================================
   HERO SECTION
====================================================== */
.hero { padding: 3.3rem 0 2.2rem; }

/* Card nền cho hero content */
.hero-grid > div:first-child,
.hero .wrap:not(.hero-grid) {
  background: linear-gradient(135deg, #ffffff 0%, #f5f9ff 50%, #edf4ff 100%);
  border: 1px solid rgba(20, 93, 246, 0.12);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

/* Decorative blobs */
.hero-grid > div:first-child::before,
.hero .wrap:not(.hero-grid)::before {
  content: "";
  position: absolute;
  top: -86px; right: -86px;
  width: 260px; height: 260px;
  background: radial-gradient(circle, rgba(20, 93, 246, 0.14) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid > div:first-child::after,
.hero .wrap:not(.hero-grid)::after {
  content: "";
  position: absolute;
  bottom: -70px; left: -50px;
  width: 220px; height: 220px;
  background: radial-gradient(circle, rgba(83, 162, 255, 0.12) 0%, transparent 72%);
  pointer-events: none;
}

/* ======================================================
   COMPONENTS
====================================================== */

/* --- Eyebrow label --- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.78rem;
  border-radius: 999px;
  background: var(--brand-soft);
  border: 1px solid rgba(20, 93, 246, 0.14);
  color: var(--brand-strong);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 5px rgba(20, 93, 246, 0.1);
}

/* --- Tags --- */
.tag-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid rgba(20, 93, 246, 0.12);
  color: var(--brand-strong);
  font-size: 0.76rem;
  font-weight: 600;
}

/* --- Buttons --- */
.button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 46px;
  padding: 0.8rem 1.2rem;
  border-radius: 14px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #fff;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(20, 93, 246, 0.28);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.button:hover,
.button-link:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 16px 38px rgba(20, 93, 246, 0.35);
}

.button.alt {
  background: #fff;
  color: var(--brand);
  border-color: rgba(20, 93, 246, 0.18);
  box-shadow: none;
}

.button.alt:hover {
  background: var(--brand-soft);
  color: var(--brand-strong);
}

/* --- Cards --- */
.card,
.panel,
.coupon-box,
.faq-item,
.deal-box,
.table-wrap {
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.card, .panel, .table-wrap { padding: 1.35rem; }

.faq-item, .deal-box { padding: 1.25rem; }

.coupon-box {
  padding: 1.45rem;
  background: linear-gradient(135deg, #ffffff 0%, #f5f9ff 100%);
  border-color: rgba(20, 93, 246, 0.12);
  box-shadow: var(--shadow);
}

.card:hover, .panel:hover, .faq-item:hover, .deal-box:hover {
  transform: translateY(-3px);
  border-color: rgba(20, 93, 246, 0.16);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.1);
}

/* --- Coupon code display --- */
.coupon-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 64px;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  background: #fff;
  border: 1px dashed rgba(20, 93, 246, 0.28);
  color: var(--brand);
  font-family: "DM Mono", monospace;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

/* --- Metrics row --- */
.metric {
  padding: 0.95rem;
  border-radius: 16px;
  background: linear-gradient(135deg, #f3f8ff, #ecf3ff);
  border: 1px solid rgba(20, 93, 246, 0.08);
}
.metric strong {
  display: block;
  margin-bottom: 0.28rem;
  font-size: 1.25rem;
  color: var(--brand);
}

/* --- List (clean, no bullet, custom dot) --- */
.list-clean { list-style: none; padding: 0; margin: 0; }
.list-clean li { position: relative; padding-left: 1.1rem; }
.list-clean li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.6rem;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--brand);
}
.list-clean li + li { margin-top: 0.78rem; }

/* --- Table --- */
.table-wrap { overflow-x: auto; }
.table { width: 100%; min-width: 640px; border-collapse: collapse; }
.table th, .table td {
  padding: 0.95rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.table th {
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.table td:first-child { font-weight: 700; }

/* --- FAQ list --- */
.faq-list { display: grid; gap: 1rem; }

/* --- Deal box --- */
.deal-box p { margin-bottom: 0; }
.deal-box hr { border: 0; border-top: 1px solid var(--line); margin: 0.9rem 0 0; }

/* --- Media card (images) --- */
.media-card {
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.media-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.media-card figcaption { display: none; }
/* NOTE: Vẫn viết figcaption trong HTML để screen reader và SEO đọc được */

/* --- Breadcrumbs --- */
.breadcrumbs { font-size: 0.85rem; color: var(--muted); padding-top: 1.1rem; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--brand); }

/* ======================================================
   FOOTER
====================================================== */
.site-footer { margin-top: 2.5rem; padding: 0 0 3rem; }

.footer-panel {
  background: linear-gradient(135deg, #0f49cf 0%, #145df6 55%, #2a7dff 100%);
  color: #fff;
  border-radius: 28px;
  padding: 2.2rem;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
}

.footer-panel::before {
  content: "";
  position: absolute;
  top: -50px; right: -50px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.footer-panel::after {
  content: "";
  position: absolute;
  bottom: -70px; left: -20px;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
}

.footer-panel h3, .footer-panel p,
.footer-panel a, .footer-panel li { color: #fff; }
.footer-panel p { opacity: 0.88; }

.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li + li { margin-top: 0.52rem; }
.footer-links a { opacity: 0.92; }
.footer-links a:hover { opacity: 1; }

.footer-note {
  position: relative;
  z-index: 1;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 0.8rem;
  line-height: 1.7;
  opacity: 0.88;
}

/* ======================================================
   STANDARD LIST BULLETS (cho <ul> thường)
====================================================== */
ul:not(.list-clean):not(.nav-list):not(.footer-links) {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
}
ul:not(.list-clean):not(.nav-list):not(.footer-links) li + li {
  margin-top: 0.52rem;
}

/* ======================================================
   RESPONSIVE — MOBILE BREAKPOINT
====================================================== */
@media (max-width: 920px) {
  .hero-grid, .split, .cards-2, .cards-3,
  .deal-grid, .blog-grid, .media-grid,
  .metrics, .footer-grid {
    grid-template-columns: 1fr;
  }

  .menu-toggle { display: inline-flex; }

  .nav-row {
    width: 100%;
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-list {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding-top: 0.75rem;
  }

  .nav-list a, .nav-cta {
    width: 100%;
    justify-content: center;
  }

  .nav-list.open { display: flex; }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-grid > div:first-child,
  .hero .wrap:not(.hero-grid),
  .coupon-box { padding: 1.5rem; }

  h1 { max-width: none; }
}