/* ==========================
   LÊ THỊ ÁNH HỒNG — STYLE.CSS
   Theme: Purple / Red (Premium)
   Works with: index.html (8 sections)
   ========================== */

/* ---------- CSS RESET (modern) ---------- */
*, *::before, *::after { box-sizing: border-box; }
html:focus-within { scroll-behavior: smooth; }
html, body { height: 100%; }
body { margin: 0; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }
a { color: inherit; text-decoration: none; }
p { margin: 0 0 1rem; }
h1, h2, h3 { margin: 0 0 .75rem; line-height: 1.15; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
details summary { cursor: pointer; }

/* ---------- THEME TOKENS ---------- */
:root{
  /* Surfaces */
  --bg: #070611;            /* deep */
  --bg2:#0B0920;            /* section alt */
  --card:#0E0C24;
  --card2:#0C0A1C;
  --stroke: rgba(255,255,255,.10);

  /* Text */
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.70);
  --muted2: rgba(255,255,255,.56);

  /* Purple / Red accents */
  --p1:#8B5CF6;             /* purple */
  --p2:#EC4899;             /* pink */
  --r1:#EF4444;             /* red */
  --r2:#FB7185;             /* rose */

  /* Gradients */
  --grad: linear-gradient(135deg, var(--p1), var(--p2) 55%, var(--r1));
  --grad2: linear-gradient(135deg, rgba(139,92,246,.25), rgba(236,72,153,.18) 55%, rgba(239,68,68,.14));
  --glow: 0 18px 60px rgba(139,92,246,.18), 0 12px 40px rgba(236,72,153,.12);

  /* Radii & spacing */
  --r-lg: 22px;
  --r-md: 16px;
  --r-sm: 12px;

  --container: 1120px;

  /* Shadow */
  --shadow: 0 12px 40px rgba(0,0,0,.45);
  --shadow2: 0 10px 26px rgba(0,0,0,.35);

  /* Typography */
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}

/* ---------- BASE ---------- */
body{
  font-family: var(--font);
  background:
    radial-gradient(900px 500px at 12% 12%, rgba(139,92,246,.18), transparent 50%),
    radial-gradient(700px 460px at 80% 14%, rgba(239,68,68,.12), transparent 52%),
    radial-gradient(720px 520px at 70% 78%, rgba(236,72,153,.10), transparent 55%),
    var(--bg);
  color: var(--text);
}

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

.skip-link{
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 9999;
  background: #fff;
  color: #111;
  padding: .75rem 1rem;
  border-radius: 10px;
}
.skip-link:focus{ left: 12px; }

/* ---------- HEADER / NAV ---------- */
.header{
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7,6,17,.65);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.header__inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .9rem 0;
}

.brand{
  display:flex;
  align-items:center;
  gap:.8rem;
  min-width: 220px;
}
.brand__mark{
  width: 44px; height: 44px;
  border-radius: 14px;
  display:grid; place-items:center;
  background: var(--grad);
  box-shadow: var(--glow);
  font-weight: 800;
  letter-spacing:.5px;
}
.brand__text{ display:flex; flex-direction:column; gap:.1rem; }
.brand__text strong{ font-size: .98rem; }
.brand__sub{ font-size: .78rem; color: var(--muted2); }

.nav{ display:flex; align-items:center; gap:.6rem; }
.nav__menu{
  display:flex;
  align-items:center;
  gap: .9rem;
}
.nav__menu a{
  font-size: .92rem;
  color: var(--muted);
  padding: .55rem .6rem;
  border-radius: 12px;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
.nav__menu a:hover{
  background: rgba(255,255,255,.06);
  color: var(--text);
  transform: translateY(-1px);
}

.nav__toggle{
  display:none;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: var(--text);
}
.nav__toggleLines{
  width: 18px;
  height: 2px;
  background: var(--text);
  display:block;
  margin: 0 auto;
  position: relative;
}
.nav__toggleLines::before,
.nav__toggleLines::after{
  content:"";
  position:absolute;
  left:0;
  width: 18px;
  height: 2px;
  background: var(--text);
}
.nav__toggleLines::before{ top: -6px; }
.nav__toggleLines::after{ top: 6px; }

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  border-radius: 14px;
  padding: .85rem 1.05rem;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: var(--text);
  cursor:pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  box-shadow: 0 8px 22px rgba(0,0,0,.24);
}
.btn:hover{ transform: translateY(-1px); border-color: rgba(255,255,255,.18); }
.btn:active{ transform: translateY(0); }
.btn--primary{
  background: var(--grad);
  border-color: rgba(255,255,255,.10);
  box-shadow: var(--glow);
}
.btn--primary:hover{ filter: brightness(1.03); }
.btn--ghost{
  background: transparent;
  border-color: rgba(255,255,255,.14);
}
.btn--sm{ padding: .6rem .85rem; border-radius: 12px; font-size: .9rem; }
.btn--block{ width: 100%; }

/* ---------- HERO ---------- */
.hero{
  padding: 3.25rem 0 1.25rem;
  position: relative;
  overflow: hidden;
}
.hero::before{
  content:"";
  position:absolute;
  inset: -2px;
  background: radial-gradient(600px 360px at 20% 20%, rgba(139,92,246,.22), transparent 60%),
              radial-gradient(640px 420px at 80% 20%, rgba(239,68,68,.15), transparent 62%),
              radial-gradient(760px 520px at 70% 80%, rgba(236,72,153,.12), transparent 65%);
  pointer-events:none;
  z-index: 0;
}
.hero__grid{
  position: relative;
  z-index: 1;
  display:grid;
  grid-template-columns: 1.2fr .9fr;
  gap: 2rem;
  align-items: center;
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  color: var(--muted);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  padding: .5rem .75rem;
  border-radius: 999px;
  width: fit-content;
  margin-bottom: 1rem;
}
.dot{
  width: 10px; height: 10px;
  border-radius: 99px;
  background: var(--grad);
  box-shadow: 0 0 0 4px rgba(139,92,246,.18);
}

.hero__title{
  font-size: clamp(2rem, 4vw, 3.35rem);
  letter-spacing: -0.02em;
}
.accent{
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle{
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 62ch;
}

.hero__badges{
  display:grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin: 1.35rem 0 1.1rem;
}
.badge{
  border-radius: var(--r-md);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.10);
  padding: .85rem .9rem;
  box-shadow: var(--shadow2);
}
.badge__title{ display:block; font-weight: 700; }
.badge__desc{ display:block; color: var(--muted2); margin-top: .2rem; font-size: .92rem; }

.hero__note{
  color: var(--muted);
  line-height: 1.7;
}

.hero__cta{
  display:flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin: 1.25rem 0 1rem;
}

.hero__meta{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
}
.metaItem{
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  padding: .85rem .9rem;
  border-radius: var(--r-md);
}
.metaItem__label{ display:block; color: var(--muted2); font-size: .82rem; }
.metaItem__value{ display:block; margin-top: .2rem; color: var(--text); font-weight: 600; }

.hero__media{ display:flex; justify-content: flex-end; }
.portrait{
  margin: 0;
  width: min(420px, 100%);
  border-radius: var(--r-lg);
  overflow:hidden;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.03);
  box-shadow: var(--shadow);
  position: relative;
}
.portrait img{
  width:100%;
  height:auto;
  transform: scale(1.02);
  filter: saturate(1.05) contrast(1.02);
}
.portrait::after{
  content:"";
  position:absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7,6,17,.60), transparent 55%);
  pointer-events:none;
}
.portrait__cap{
  position:absolute;
  left: 14px;
  right: 14px;
  bottom: 14px;
  padding: .85rem .9rem;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(7,6,17,.55);
  backdrop-filter: blur(10px);
}
.portrait__capTitle{ display:block; font-weight: 800; }
.portrait__capSub{ display:block; color: var(--muted2); margin-top: .15rem; }

.hero__strip{
  position: relative;
  z-index: 1;
  display:flex;
  flex-wrap: wrap;
  gap: .55rem;
  padding: 1.1rem 0 0;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  border-radius: 999px;
  padding: .55rem .85rem;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  color: var(--muted);
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
.chip:hover{ transform: translateY(-1px); background: rgba(255,255,255,.06); color: var(--text); }

/* ---------- SECTIONS ---------- */
.section{
  padding: 4rem 0;
}
.section--alt{
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00));
}
.section__head{
  margin-bottom: 1.5rem;
}
.section__title{
  font-size: clamp(1.55rem, 2.5vw, 2.2rem);
  letter-spacing: -0.015em;
}
.section__lead{
  color: var(--muted);
  line-height: 1.75;
  max-width: 78ch;
}

/* ---------- GRID ---------- */
.grid{
  display:grid;
  gap: 1.1rem;
}
.grid--2{ grid-template-columns: 1fr 1fr; }
.grid--3{ grid-template-columns: repeat(3, 1fr); }

/* ---------- CARD ---------- */
.card{
  border-radius: var(--r-lg);
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  box-shadow: var(--shadow2);
  padding: 1.25rem 1.25rem;
  position: relative;
  overflow: hidden;
}
.card::before{
  content:"";
  position:absolute;
  inset: -1px;
  background: var(--grad2);
  opacity: .42;
  pointer-events:none;
  mask: linear-gradient(#000, transparent 58%);
}
.card--soft{ background: rgba(255,255,255,.025); }
.card--accent{
  border-color: rgba(236,72,153,.25);
  box-shadow: var(--glow);
}
.card__title{
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.card__text{
  color: var(--muted);
  line-height: 1.8;
}

/* ---------- LISTS ---------- */
.list{
  margin-top: .75rem;
  display:grid;
  gap: .55rem;
}
.list li{
  color: var(--muted);
  line-height: 1.65;
  padding-left: 1.1rem;
  position: relative;
}
.list li::before{
  content:"";
  width: 8px; height: 8px;
  border-radius: 99px;
  background: var(--grad);
  position:absolute;
  left: 0;
  top: .55rem;
  box-shadow: 0 0 0 3px rgba(139,92,246,.14);
}
.list--cols{
  grid-template-columns: 1fr 1fr;
  column-gap: 1.2rem;
}

/* ---------- TIMELINE ---------- */
.timeline{
  margin-top: 1rem;
  display:grid;
  gap: .9rem;
}
.timeline__item{
  display:grid;
  grid-template-columns: 18px 1fr;
  gap: .8rem;
  align-items:flex-start;
}
.timeline__dot{
  width: 12px; height: 12px;
  margin-top: .35rem;
  border-radius: 99px;
  background: var(--grad);
  box-shadow: 0 0 0 4px rgba(236,72,153,.14);
}
.timeline__title{ font-weight: 800; }
.timeline__desc{ color: var(--muted); margin-top: .25rem; line-height: 1.7; }

/* ---------- QUOTE ---------- */
.quote{
  margin-top: 1.1rem;
  padding: 1.1rem 1.1rem;
  border-radius: var(--r-lg);
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.03);
}
.quote__text{ color: var(--text); line-height: 1.75; }
.quote__by{ color: var(--muted2); margin-top: .6rem; }

/* ---------- CALLOUT / NOTICE ---------- */
.callout{
  margin-top: 1.2rem;
  border-radius: var(--r-lg);
  padding: 1.2rem 1.2rem;
  border: 1px solid rgba(255,255,255,.12);
  background: linear-gradient(135deg, rgba(139,92,246,.12), rgba(236,72,153,.08) 55%, rgba(239,68,68,.06));
  box-shadow: var(--shadow2);
}
.callout__title{ font-size: 1.1rem; }
.callout__text{ color: var(--muted); line-height: 1.8; }

.notice{
  margin-top: 1rem;
  border-radius: var(--r-md);
  padding: .85rem .95rem;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.16);
  color: var(--muted);
  line-height: 1.65;
}
.notice strong{ color: var(--text); }

/* ---------- PILLS ---------- */
.pillGrid{
  display:flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: 1rem;
}
.pill{
  padding: .55rem .8rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  color: var(--muted);
  font-size: .92rem;
}

/* ---------- SPLIT ---------- */
.split{
  margin-top: 1.2rem;
  display:grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 1.1rem;
  align-items: start;
}
.split__title{ font-size: 1.15rem; }
.split__item p{ color: var(--muted); line-height: 1.85; }

/* ---------- STEPS ---------- */
.steps{
  margin-top: .75rem;
  display:grid;
  gap: .65rem;
  counter-reset: step;
}
.steps li{
  counter-increment: step;
  position: relative;
  padding: .8rem .85rem .8rem 3rem;
  border-radius: var(--r-md);
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  color: var(--muted);
  line-height: 1.65;
}
.steps li::before{
  content: counter(step);
  position:absolute;
  left: .8rem;
  top: .75rem;
  width: 28px; height: 28px;
  border-radius: 999px;
  display:grid; place-items:center;
  background: var(--grad);
  color: rgba(255,255,255,.92);
  font-weight: 800;
  box-shadow: 0 0 0 4px rgba(139,92,246,.14);
}
.steps--compact li{ padding-top: .7rem; padding-bottom: .7rem; }

/* ---------- HIGHLIGHTS ---------- */
.highlights{ margin-top: 1rem; display:grid; gap: .7rem; }
.highlight{
  display:flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .8rem .9rem;
  border-radius: var(--r-md);
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
}
.highlight__k{ color: var(--muted2); }
.highlight__v{ color: var(--text); font-weight: 650; }

/* ---------- FAQ ---------- */
.faq{ display:grid; gap: .75rem; }
.faq__item{
  border-radius: var(--r-lg);
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  box-shadow: var(--shadow2);
  overflow: hidden;
}
.faq__q{
  padding: 1rem 1.05rem;
  list-style: none;
  font-weight: 750;
  color: var(--text);
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 1rem;
}
.faq__q::-webkit-details-marker{ display:none; }
.faq__q::after{
  content:"+";
  display:inline-block;
  width: 28px; height: 28px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.03);
  text-align:center;
  line-height: 26px;
  color: var(--muted);
  flex: 0 0 auto;
  transition: transform .2s ease;
}
details[open] .faq__q::after{
  content:"–";
  transform: rotate(0deg);
  color: rgba(255,255,255,.88);
}
.faq__a{
  padding: 0 1.05rem 1rem;
  color: var(--muted);
  line-height: 1.75;
}

/* ---------- CONTACT ---------- */
.contact{
  display:grid;
  gap: .75rem;
  margin: 1rem 0 1.1rem;
}
.contact__row{
  display:flex;
  align-items:flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: .75rem .85rem;
  border-radius: var(--r-md);
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
}
.contact__k{ color: var(--muted2); }
.contact__v a{ text-decoration: underline; text-underline-offset: 3px; }

/* ---------- FORM ---------- */
.form{ margin-top: .9rem; display:grid; gap: .85rem; }
.field{ display:grid; gap: .45rem; }
.field span{ color: var(--muted2); font-size: .9rem; }
.field input, .field textarea{
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.14);
  color: var(--text);
  padding: .85rem .95rem;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field input:focus, .field textarea:focus{
  border-color: rgba(236,72,153,.38);
  box-shadow: 0 0 0 4px rgba(139,92,246,.18);
}
.form__hint{
  color: var(--muted2);
  font-size: .88rem;
  line-height: 1.6;
  margin-top: .2rem;
}

/* ---------- FOOTER ---------- */
.footer{
  padding: 2.8rem 0 1.3rem;
  border-top: 1px solid rgba(255,255,255,.06);
  background: rgba(0,0,0,.18);
}
.footer__grid{
  display:grid;
  grid-template-columns: 1.2fr .9fr 1fr;
  gap: 1.1rem;
  align-items:start;
}
.brand--footer .brand__mark{ width: 40px; height: 40px; border-radius: 14px; }
.footer__title{ font-size: 1rem; margin-bottom: .65rem; }
.footer__text{ color: var(--muted); line-height: 1.75; }
.footer__links{ display:grid; gap: .4rem; }
.footer__links a{
  color: var(--muted);
  padding: .25rem 0;
  border-radius: 10px;
}
.footer__links a:hover{ color: var(--text); text-decoration: underline; text-underline-offset: 3px; }

.footer__bottom{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.2rem;
  margin-top: 1.2rem;
  border-top: 1px solid rgba(255,255,255,.06);
  color: var(--muted2);
}
.toTop{
  width: 42px; height: 42px;
  border-radius: 14px;
  display:grid; place-items:center;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.03);
  transition: transform .2s ease, background .2s ease;
}
.toTop:hover{ transform: translateY(-1px); background: rgba(255,255,255,.06); }

/* ---------- NOSCRIPT ---------- */
.noscript{
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  padding: .9rem 1rem;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(7,6,17,.85);
  color: var(--muted);
  backdrop-filter: blur(10px);
}

/* ---------- REVEAL (used by main.js if present) ---------- */
[data-reveal]{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .7s ease, transform .7s ease;
}
.revealed{
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 980px){
  .hero__grid{ grid-template-columns: 1fr; }
  .hero__media{ justify-content: flex-start; }
  .hero__meta{ grid-template-columns: 1fr; }
  .split{ grid-template-columns: 1fr; }
  .grid--3{ grid-template-columns: 1fr; }
  .grid--2{ grid-template-columns: 1fr; }
  .footer__grid{ grid-template-columns: 1fr; }
  .list--cols{ grid-template-columns: 1fr; }
}

@media (max-width: 860px){
  .nav__toggle{ display:inline-flex; align-items:center; justify-content:center; }
  .nav__menu{
    position: absolute;
    right: 1rem;
    top: 68px;
    width: min(520px, calc(100% - 2rem));
    display:none;
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
    padding: .7rem;
    border-radius: var(--r-lg);
    border: 1px solid rgba(255,255,255,.12);
    background: rgba(7,6,17,.92);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
  }
  .nav__menu a{
    padding: .75rem .85rem;
    border-radius: 14px;
    background: rgba(255,255,255,.03);
  }
  .nav__menu a:hover{ background: rgba(255,255,255,.06); }
  .nav__menu.is-open{ display:flex; }
}

/* ---------- SMALL ---------- */
@media (max-width: 520px){
  .hero{ padding-top: 2.5rem; }
  .hero__cta{ flex-direction: column; }
  .btn{ width: 100%; }
  .brand__sub{ display:none; }
}