/* KGame – k-game-app.lat */
:root {
  --bg: #f2f5f9;
  --bg-alt: #e8eef6;
  --surface: #ffffff;
  --ink: #0f1c2e;
  --ink-soft: #3d4f66;
  --muted: #6b7c91;
  --line: #d5deea;
  --brand: #1a6fd4;
  --brand-deep: #0d4a9a;
  --brand-soft: #e8f1fc;
  --accent: #c9a227;
  --accent-soft: #f7f0d8;
  --navy: #0b1628;
  --navy-mid: #132338;
  --ok: #1a7a4c;
  --danger: #b42318;
  --radius: 12px;
  --shadow: 0 12px 40px rgba(15, 28, 46, 0.08);
  --header-h: 72px;
  --font-display: "Outfit", "Be Vietnam Pro", sans-serif;
  --font-body: "Be Vietnam Pro", "Segoe UI", sans-serif;
  --max: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(26, 111, 212, 0.12), transparent 60%),
    radial-gradient(900px 420px at 100% 0%, rgba(201, 162, 39, 0.08), transparent 55%),
    linear-gradient(180deg, #eef3f9 0%, var(--bg) 28%, #f7f9fc 100%);
  line-height: 1.65;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--brand-deep);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--brand);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
  color: var(--ink);
}

p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

ul, ol {
  color: var(--ink-soft);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 10000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(11, 22, 40, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  max-width: min(48vw, 220px);
  overflow: hidden;
}

.brand img {
  height: 36px;
  width: auto;
  max-height: 40px;
  max-width: 168px;
  object-fit: contain;
  object-position: left center;
  mix-blend-mode: screen;
}

.brand-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
  letter-spacing: 0.04em;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 0.15rem;
  margin-left: auto;
}

.nav-desktop a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.header-actions {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.15rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
  font-family: inherit;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
}

.btn-primary:hover {
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.28);
}

.btn-ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.btn-outline {
  background: var(--surface);
  color: var(--brand-deep);
  border-color: var(--line);
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #fff;
  border-radius: 10px;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
}

.menu-toggle svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--navy-mid);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1rem;
  z-index: 999;
  animation: slideDown 0.22s ease;
}

.nav-mobile.open {
  display: block;
}

.nav-mobile a {
  display: block;
  color: rgba(255, 255, 255, 0.9);
  padding: 0.75rem 0.85rem;
  border-radius: 8px;
  font-weight: 500;
}

.nav-mobile a:hover,
.nav-mobile a.active {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.nav-mobile .mobile-auth {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes softPulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

.reveal {
  animation: fadeUp 0.7s ease both;
}

.reveal-delay-1 { animation-delay: 0.12s; }
.reveal-delay-2 { animation-delay: 0.24s; }

main {
  padding-top: var(--header-h);
}

/* Hero */
.hero {
  position: relative;
  min-height: min(78vh, 640px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--navy);
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 16, 30, 0.92) 0%, rgba(8, 16, 30, 0.72) 48%, rgba(8, 16, 30, 0.35) 100%),
    linear-gradient(0deg, rgba(8, 16, 30, 0.85) 0%, transparent 45%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 3.5rem 0 3rem;
  max-width: 640px;
  color: #fff;
}

.hero-content h1 {
  color: #fff;
  font-size: clamp(1.85rem, 4.2vw, 3rem);
  margin-bottom: 0.85rem;
}

.hero-content p {
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.05rem;
  max-width: 36rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

/* Sections */
.section {
  padding: 3.5rem 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(232, 238, 246, 0.9));
  border-block: 1px solid var(--line);
}

.section-head {
  margin-bottom: 1.75rem;
  max-width: 42rem;
}

.section-head h2 {
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.section-head p {
  margin-bottom: 0;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 0.55rem;
}

/* Intro / prose */
.prose {
  max-width: 70ch;
}

.prose h2,
.prose h3 {
  margin-top: 1.75rem;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.intro-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 900px) {
  .intro-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.intro-visual {
  position: relative;
}

.intro-visual img {
  width: 100%;
  border-radius: var(--radius);
  background: var(--navy);
}

.intro-visual::after {
  content: "";
  position: absolute;
  inset: auto -12px -12px auto;
  width: 42%;
  height: 42%;
  background: radial-gradient(circle, rgba(26, 111, 212, 0.25), transparent 70%);
  z-index: -1;
  animation: softPulse 4s ease-in-out infinite;
}

/* Category grid */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 700px) {
  .cat-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1000px) {
  .cat-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.cat-item {
  display: block;
  text-align: center;
  color: inherit;
  transition: transform 0.2s ease;
}

.cat-item:hover {
  transform: translateY(-4px);
  color: inherit;
}

.cat-item figure {
  margin: 0;
  background: var(--navy);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.cat-item img {
  width: 86%;
  height: 86%;
  object-fit: contain;
}

.cat-item h3 {
  margin: 0.7rem 0 0.2rem;
  font-size: 1rem;
}

.cat-item p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Article cards */
.card-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 700px) {
  .card-grid.cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  color: inherit;
  height: 100%;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 44px rgba(15, 28, 46, 0.12);
  color: inherit;
}

.article-card .thumb {
  background: var(--navy);
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.article-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card .body {
  padding: 1.1rem 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.85rem;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.55rem;
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-deep);
  font-size: 0.75rem;
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.45rem;
}

.article-card p {
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 0.85rem;
}

.read-more {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--brand-deep);
}

/* FAQ */
.faq-list {
  display: grid;
  gap: 0.75rem;
  max-width: 820px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  padding: 1rem 1.15rem;
  font-weight: 600;
  font-family: var(--font-display);
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--brand);
  font-weight: 400;
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item .faq-a {
  padding: 0 1.15rem 1.1rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  margin-top: 0;
  padding-top: 0.9rem;
}

/* Brands strip */
.brand-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.brand-strip img {
  height: 36px;
  width: auto;
  object-fit: contain;
  opacity: 0.85;
  filter: grayscale(0.15);
}

/* Breadcrumb */
.breadcrumb {
  padding: 1.1rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.35rem;
  color: var(--line);
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--brand);
}

.page-hero {
  padding: 1.5rem 0 0.5rem;
}

.page-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.35rem);
}

/* Article page */
.article-layout {
  display: grid;
  gap: 2rem;
  padding-bottom: 3rem;
}

@media (min-width: 960px) {
  .article-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}

.article-cover {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--navy);
  margin: 1.25rem 0 1.5rem;
  aspect-ratio: 16 / 9;
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem;
  box-shadow: var(--shadow);
}

.article-body h2 {
  font-size: 1.35rem;
  margin-top: 1.6rem;
}

.article-body h3 {
  font-size: 1.1rem;
  margin-top: 1.25rem;
}

.article-body ul,
.article-body ol {
  padding-left: 1.2rem;
  margin-bottom: 1rem;
}

.article-body li {
  margin-bottom: 0.35rem;
}

.sidebar {
  display: grid;
  gap: 1rem;
}

.sidebar-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem;
}

.sidebar-box h3 {
  font-size: 1rem;
  margin-bottom: 0.85rem;
}

.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.related-list a {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 0.7rem;
  align-items: center;
  color: inherit;
}

.related-list img {
  width: 72px;
  height: 54px;
  object-fit: cover;
  border-radius: 8px;
  background: var(--navy);
}

.related-list span {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.35;
}

/* Checklist */
.check-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  display: grid;
  gap: 0.65rem;
}

.check-list li {
  position: relative;
  padding: 0.85rem 1rem 0.85rem 2.6rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0.95rem;
  top: 1.05rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px var(--brand-soft);
}

/* Error pages */
.error-page {
  min-height: calc(100vh - var(--header-h));
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--brand), var(--navy));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 0.5rem;
}

/* Footer */
.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.78);
  padding: 3rem 0 1.5rem;
  margin-top: 2rem;
}

.footer-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 800px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.site-footer h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.85rem;
}

.site-footer p,
.site-footer a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
}

.site-footer a:hover {
  color: #fff;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
}

/* Desktop nav */
@media (min-width: 960px) {
  .nav-desktop {
    display: flex;
  }
  .header-actions {
    display: flex;
  }
  .menu-toggle {
    display: none;
  }
  .nav-mobile {
    display: none !important;
  }
}

/* Utilities */
.cta-band {
  background: linear-gradient(135deg, var(--navy) 0%, var(--brand-deep) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  display: grid;
  gap: 1rem;
  align-items: center;
}

@media (min-width: 800px) {
  .cta-band {
    grid-template-columns: 1fr auto;
    padding: 2.25rem 2rem;
  }
}

.cta-band h2 {
  color: #fff;
  margin-bottom: 0.35rem;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.two-col {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 800px) {
  .two-col {
    grid-template-columns: 1fr 1fr;
  }
}

.note-box {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.1rem;
  border-radius: 0 10px 10px 0;
  margin: 1.25rem 0;
}

.note-box p {
  margin: 0;
  color: var(--ink);
}

.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

th {
  background: var(--bg-alt);
  font-weight: 600;
  color: var(--ink);
}

tr:last-child td {
  border-bottom: none;
}