/* =========================================================
   TLBB Mobile – Máy chủ Đại Lý · Trang chủ
   Tông màu: đỏ đậm · vàng kim · đen
   ========================================================= */

:root {
  --black: #0b0706;
  --black-2: #140b08;
  --red: #a3121b;
  --red-bright: #d42a2a;
  --red-dark: #5c0a0e;
  --gold: #e2b85c;
  --gold-light: #f8e3a3;
  --gold-dark: #8a6326;
  --text: #ece0c4;
  --text-muted: #a8977a;

  --header-h: 64px;
  --font-title: "Playfair Display", "Times New Roman", serif;
  --font-body: "Be Vietnam Pro", "Segoe UI", Arial, sans-serif;

  --gold-text: linear-gradient(180deg, #fff8dc 0%, #f7da86 34%, #d6a03c 54%, #f4d27a 74%, #b07722 100%);

  /* Khung vàng cổ trang (9-slice cho border-image): viền đôi + góc chữ L + hạt thoi */
  --frame: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' viewBox='0 0 48 48' width='48' height='48'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' y1='0' x2='1' y2='1'%3E%3Cstop offset='0' stop-color='%23fbe7a6'/%3E%3Cstop offset='.5' stop-color='%23d9a744'/%3E%3Cstop offset='1' stop-color='%23f3d27f'/%3E%3C/linearGradient%3E%3Cg id='c' fill='url(%23g)'%3E%3Cpath d='M0 0h13v2.6H2.6V13H0z'/%3E%3Cpath d='M5 5h6v1.6H6.6V11H5z'/%3E%3Cpath d='M10 7.2l2.8 2.8-2.8 2.8-2.8-2.8z'/%3E%3C/g%3E%3C/defs%3E%3Crect x='1.3' y='1.3' width='45.4' height='45.4' fill='none' stroke='url(%23g)' stroke-width='1.4'/%3E%3Crect x='4.5' y='4.5' width='39' height='39' fill='none' stroke='%238a6326' stroke-width='1'/%3E%3Cuse xlink:href='%23c'/%3E%3Cuse xlink:href='%23c' transform='translate(48 0) scale(-1 1)'/%3E%3Cuse xlink:href='%23c' transform='translate(0 48) scale(1 -1)'/%3E%3Cuse xlink:href='%23c' transform='translate(48 48) scale(-1 -1)'/%3E%3C/svg%3E");
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 8px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--black);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--gold-light);
  outline-offset: 3px;
}

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  background: linear-gradient(180deg, rgba(8, 5, 4, 0.92), rgba(12, 7, 5, 0.72));
  border-bottom: 1px solid rgba(226, 184, 92, 0.45);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.6), 0 6px 24px rgba(0, 0, 0, 0.35);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: background-color 0.3s ease;
}

/* đường chỉ vàng mảnh sát mép dưới header */
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(226, 184, 92, 0.55) 20%, rgba(248, 227, 163, 0.8) 50%, rgba(226, 184, 92, 0.55) 80%, transparent);
  pointer-events: none;
}

.header-inner {
  height: 100%;
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.brand img {
  height: 46px;
  width: auto;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.7));
  transition: transform 0.3s ease;
}

.brand:hover img {
  transform: scale(1.05);
}

.main-nav ul {
  display: flex;
  gap: clamp(18px, 2.6vw, 44px);
}

.main-nav a {
  position: relative;
  display: block;
  padding: 8px 2px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  transition: color 0.25s ease;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  right: 50%;
  bottom: 2px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-light), transparent);
  transition: left 0.3s ease, right 0.3s ease;
}

.main-nav a:hover,
.main-nav a.is-active {
  color: var(--gold);
}

.main-nav a:hover::after,
.main-nav a.is-active::after {
  left: 0;
  right: 0;
}

.nav-toggle {
  display: none;
  justify-self: end;
  grid-column: 3;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(226, 184, 92, 0.6);
  border-radius: 4px;
  background: rgba(20, 11, 8, 0.8);
  color: var(--gold);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  background: var(--red-dark);
  color: var(--gold-light);
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  padding-top: var(--header-h);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  isolation: isolate;
  background: var(--black);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -3;
  background: url("assets/hero-bg.jpg") center 30% / cover no-repeat;
  filter: brightness(0.68) saturate(0.88) contrast(1.06);
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(180deg, rgba(8, 5, 4, 0.7) 0%, rgba(8, 5, 4, 0.05) 16%, rgba(8, 5, 4, 0) 46%, rgba(10, 6, 5, 0.72) 74%, var(--black) 100%),
    linear-gradient(90deg, rgba(8, 5, 4, 0.55) 0%, rgba(8, 5, 4, 0) 38%),
    radial-gradient(ellipse 60% 55% at 50% 38%, rgba(120, 30, 10, 0.18), transparent 70%);
}

.hero-char {
  position: absolute;
  z-index: 1;
  left: clamp(-140px, -4vw, -10px);
  bottom: 0;
  height: min(calc(100% - var(--header-h) - 10px), 1040px);
  width: auto;
  max-width: none;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 62%, transparent 96%);
  mask-image: linear-gradient(180deg, #000 62%, transparent 96%);
  filter: drop-shadow(10px 0 30px rgba(0, 0, 0, 0.55));
}

.hero-content {
  position: relative;
  z-index: 4;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 8px 16px clamp(8px, 2vh, 24px);
  padding-left: clamp(16px, 10vw, 220px);
  text-align: center;
}

/* Logo nằm sát mép trên; slogan + nút căn giữa phần còn lại */
.hero-logo {
  margin: 0;
  width: clamp(130px, 15.5vw, 300px);
  filter: drop-shadow(0 10px 28px rgba(0, 0, 0, 0.65));
}

.hero-logo img {
  width: 100%;
  height: auto;
}

/* Slogan – ảnh chữ thư pháp vàng trên nền lụa đỏ */
.slogan {
  margin: auto 0 0;
  width: clamp(300px, 32vw, 620px);
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.6));
}

.slogan img {
  width: 100%;
  height: auto;
}

/* Nút tải game */
.download {
  margin: clamp(14px, 2.6vh, 30px) 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.btn-download {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: clamp(220px, 17vw, 300px);
  padding: 14px 54px;
  border: 2px solid var(--gold);
  border-radius: 8px;
  font-family: var(--font-title);
  font-size: clamp(22px, 1.75vw, 30px);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff4d2;
  text-shadow: 0 2px 0 #4a0508, 0 0 12px rgba(255, 200, 120, 0.35);
  background:
    linear-gradient(110deg, transparent 38%, rgba(255, 238, 200, 0.42) 50%, transparent 62%) -160% 0 / 220% 100% no-repeat,
    linear-gradient(180deg, var(--red-bright) 0%, var(--red) 48%, #6d080d 100%);
  box-shadow:
    inset 0 0 0 3px rgba(70, 6, 8, 0.85),
    inset 0 0 0 4px rgba(248, 227, 163, 0.45),
    inset 0 10px 18px rgba(255, 140, 110, 0.18),
    0 10px 26px rgba(0, 0, 0, 0.6);
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-position 0.8s ease;
}

/* hạt thoi vàng hai đầu nút */
.btn-download::before,
.btn-download::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 12px;
  height: 12px;
  background: linear-gradient(135deg, var(--gold-light), var(--gold-dark));
  border: 1px solid #3b1a06;
  transform: translateY(-50%) rotate(45deg);
}

.btn-download::before {
  left: -8px;
}

.btn-download::after {
  right: -8px;
}

.btn-download:hover,
.btn-download:focus-visible {
  transform: translateY(-2px);
  background-position: 160% 0, 0 0;
  box-shadow:
    inset 0 0 0 3px rgba(70, 6, 8, 0.85),
    inset 0 0 0 4px rgba(248, 227, 163, 0.7),
    inset 0 10px 18px rgba(255, 160, 120, 0.25),
    0 0 18px rgba(255, 196, 90, 0.75),
    0 0 46px rgba(212, 42, 42, 0.55),
    0 10px 26px rgba(0, 0, 0, 0.6);
}

.platforms {
  display: flex;
  gap: 12px;
}

.platforms a {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(226, 184, 92, 0.55);
  border-radius: 50%;
  background: rgba(10, 6, 5, 0.6);
  color: var(--gold);
  transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.platforms svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.platforms a:hover,
.platforms a:focus-visible {
  color: var(--gold-light);
  border-color: var(--gold-light);
  box-shadow: 0 0 14px rgba(255, 196, 90, 0.5);
  transform: translateY(-2px);
}

/* =========================================================
   Sương mờ trôi + cánh hoa rơi (chỉ dùng transform/opacity)
   ========================================================= */
.mist {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 14%;
  height: 42%;
  z-index: 2;
  overflow: hidden;
  pointer-events: none;
}

.mist-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 200%;
  height: 100%;
  background-image:
    radial-gradient(ellipse 16% 34% at 12% 62%, rgba(232, 226, 220, 0.2), transparent 72%),
    radial-gradient(ellipse 22% 30% at 42% 44%, rgba(232, 226, 220, 0.15), transparent 72%),
    radial-gradient(ellipse 15% 40% at 76% 58%, rgba(232, 226, 220, 0.18), transparent 72%);
  background-size: 50% 100%;
  background-repeat: repeat-x;
  will-change: transform;
  animation: mist-drift 80s linear infinite;
}

.mist-b {
  top: 18%;
  opacity: 0.7;
  animation-duration: 120s;
  animation-direction: reverse;
}

@keyframes mist-drift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-50%, 0, 0); }
}

.petals {
  position: absolute;
  inset: 0;
  z-index: 3;
  overflow: hidden;
  pointer-events: none;
}

.petal {
  position: absolute;
  top: -6%;
  left: var(--x);
  width: var(--s);
  height: calc(var(--s) * 0.72);
  border-radius: 0 100% 0 100%;
  background: radial-gradient(circle at 30% 30%, #ff7a6e 0%, #c0141f 55%, #6a060b 100%);
  opacity: var(--o);
  will-change: transform;
  animation: petal-fall var(--d) linear var(--delay) infinite;
}

.hero.is-offscreen .petal,
.hero.is-offscreen .mist-layer {
  animation-play-state: paused;
}

@keyframes petal-fall {
  0% { transform: translate3d(0, -8vh, 0) rotate(0deg); }
  50% { transform: translate3d(calc(var(--drift) * -0.5), 50vh, 0) rotate(calc(var(--rot) * 0.5)); }
  100% { transform: translate3d(var(--drift), 112vh, 0) rotate(var(--rot)); }
}

/* =========================================================
   Slider tính năng
   ========================================================= */
.features {
  position: relative;
  z-index: 4;
  width: min(1440px, 100% - 140px);
  margin: 0 auto;
  padding: 26px 0 34px;
}

.features-crest {
  position: absolute;
  top: -8px;
  left: 50%;
  width: min(320px, 70%);
  transform: translateX(-50%);
  pointer-events: none;
}

.features-crest svg {
  width: 100%;
  height: auto;
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.4;
  filter: drop-shadow(0 0 6px rgba(226, 184, 92, 0.4));
}

.features-crest .crest-fill {
  fill: rgba(92, 10, 14, 0.9);
}

.slider {
  --gap: 22px;
  display: flex;
  gap: var(--gap);
  padding: 16px 8px 18px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 8px;
  scroll-behavior: smooth;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.slider::-webkit-scrollbar {
  display: none;
}

.card {
  position: relative;
  flex: 0 0 calc((100% - var(--gap) * 3) / 4);
  scroll-snap-align: start;
  background: var(--black-2);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.65);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

/* khung vàng cổ trang phủ lên toàn thẻ */
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  border: 14px solid transparent;
  border-image: var(--frame) 16 / 14px stretch;
  pointer-events: none;
}

.card-media {
  overflow: hidden;
  aspect-ratio: 2 / 1;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.card-body {
  position: relative;
  padding: 10px 18px 18px;
  text-align: center;
  background: linear-gradient(180deg, #1d0f0a 0%, #0f0806 100%);
  border-top: 1px solid rgba(226, 184, 92, 0.55);
}

.card-body h3 {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(15px, 1.15vw, 19px);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fbf0d6;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

.card-body p {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--gold);
}

.card:hover,
.card:focus-within {
  z-index: 3;
  transform: scale(1.04);
  box-shadow: 0 0 0 1px rgba(248, 227, 163, 0.6), 0 0 28px rgba(226, 184, 92, 0.38), 0 16px 34px rgba(0, 0, 0, 0.7);
}

.card:hover .card-media img {
  transform: scale(1.07);
}

.card.is-active {
  box-shadow: 0 0 0 1px rgba(248, 227, 163, 0.45), 0 0 22px rgba(226, 184, 92, 0.3), 0 12px 30px rgba(0, 0, 0, 0.65);
}

.slider-arrow {
  position: absolute;
  top: calc(50% + 4px);
  z-index: 5;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(226, 184, 92, 0.75);
  border-radius: 50%;
  background: rgba(12, 7, 5, 0.82);
  color: var(--gold);
  cursor: pointer;
  transform: translateY(-50%);
  transition: background-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.slider-arrow svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.slider-arrow:hover {
  background: var(--red);
  color: var(--gold-light);
  box-shadow: 0 0 16px rgba(255, 196, 90, 0.5);
}

.slider-arrow.prev {
  left: -58px;
}

.slider-arrow.next {
  right: -58px;
}

.slider-dots {
  display: none;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}

.slider-dots span {
  width: 8px;
  height: 8px;
  background: rgba(226, 184, 92, 0.35);
  transform: rotate(45deg);
  transition: background-color 0.25s ease;
}

.slider-dots span.is-active {
  background: var(--gold);
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--black) 0%, #060303 100%);
  border-top: 1px solid rgba(226, 184, 92, 0.35);
  padding: 34px 16px 28px;
  text-align: center;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 50%;
  width: 12px;
  height: 12px;
  background: linear-gradient(135deg, var(--gold-light), var(--gold-dark));
  transform: translateX(-50%) rotate(45deg);
}

.server-name {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  background: var(--gold-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.social {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 16px 0 18px;
}

.social a {
  display: inline-block;
  padding: 7px 22px;
  border: 1px solid rgba(226, 184, 92, 0.5);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text);
  background: rgba(20, 11, 8, 0.7);
  transition: color 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
}

.social a:hover,
.social a:focus-visible {
  color: var(--gold-light);
  border-color: var(--gold);
  background: var(--red-dark);
}

.copyright {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1280px) {
  .hero-char {
    left: -12vw;
    opacity: 0.9;
  }
}

/* Tablet */
@media (max-width: 1024px) {
  .features {
    width: min(100% - 112px, 860px);
  }

  .card {
    flex-basis: calc((100% - var(--gap)) / 2);
  }

  .card-body h3 {
    font-size: 17px;
  }

  .slider-dots {
    display: flex;
  }

  .card-media {
    aspect-ratio: 16 / 9;
  }

  .hero-content {
    padding-left: clamp(16px, 22vw, 240px);
  }

  .hero-logo {
    width: clamp(130px, 23vw, 230px);
  }

  .slogan {
    width: clamp(300px, 54vw, 460px);
  }

  .hero-char {
    left: -34vw;
    height: min(78%, 900px);
    bottom: 22%;
    opacity: 0.8;
  }
}

/* Menu thu gọn */
@media (max-width: 900px) {
  .hero-bg {
    background-image: url("assets/hero-bg-sm.jpg");
    background-position: 62% 30%;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    padding: 0 16px;
  }

  .brand img {
    height: 40px;
  }

  .nav-toggle {
    display: block;
    grid-column: 2;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 6, 5, 0.97);
    border-bottom: 1px solid rgba(226, 184, 92, 0.45);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.55);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0.25s;
  }

  .main-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 6px 16px 12px;
  }

  .main-nav li + li {
    border-top: 1px solid rgba(226, 184, 92, 0.15);
  }

  .main-nav a {
    padding: 13px 4px;
    font-size: 14px;
  }

  .main-nav a::after {
    display: none;
  }
}

/* Điện thoại */
@media (max-width: 600px) {
  .hero-content {
    padding: 8px 16px 8px;
  }

  .hero-logo {
    width: min(43vw, 200px);
  }

  .slogan {
    width: min(92vw, 400px);
  }

  .btn-download {
    min-width: 210px;
    padding: 12px 40px;
  }

  .hero-char {
    left: auto;
    right: -34vw;
    bottom: 30%;
    height: 62%;
    opacity: 0.4;
  }

  .mist {
    bottom: 26%;
  }

  .features {
    width: 100%;
    padding: 24px 0 26px;
  }

  /* Điện thoại: lưới 2×2 để thấy đủ cả 4 thẻ, không cần mũi tên */
  .slider {
    --gap: 12px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 16px 16px 8px;
    overflow: visible;
    scroll-snap-type: none;
  }

  .card::after {
    border-width: 10px;
    border-image: var(--frame) 16 / 10px stretch;
  }

  .card-body {
    padding: 8px 8px 12px;
  }

  .card-body h3 {
    font-size: 13px;
    letter-spacing: 0.02em;
    line-height: 1.3;
  }

  .card-body p {
    font-size: 11.5px;
  }

  .slider-arrow,
  .slider-dots {
    display: none;
  }
}

/* Tắt chuyển động khi người dùng yêu cầu */
@media (prefers-reduced-motion: reduce) {
  html,
  .slider {
    scroll-behavior: auto;
  }

  .petals,
  .mist-b {
    display: none;
  }

  .mist-layer {
    animation: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}