/* ═══════════════════════════════════════════════════════════
   Hoàng Đắc Phúc — landing page
   Tông chủ đạo: xanh nước biển + trắng, điểm màu sống động
   ═══════════════════════════════════════════════════════════ */

:root {
  /* Bảng màu */
  --muc:    #071B3E;  /* mực — navy sâu, dùng cho chữ và nền tối */
  --bien:   #0B5CF6;  /* biển — xanh nước biển chủ đạo */
  --troi:   #34D2FF;  /* trời — cyan sáng */
  --nang:   #FFC53D;  /* nắng — vàng */
  --san:    #FF5A5F;  /* san hô — đỏ hồng */
  --la:     #21D4A2;  /* lá — bạc hà */
  --giay:   #EEF5FF;  /* giấy — trắng ngả xanh */
  --trang:  #FFFFFF;

  --vien: 2.5px solid var(--muc);
  --bong: 10px 10px 0 var(--muc);
  --bong-nho: 6px 6px 0 var(--muc);

  --r-lon: 28px;
  --r-vua: 18px;
  --r-nho: 12px;

  --do-rong: 1180px;
  --le: clamp(20px, 5vw, 56px);

  --dai: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--trang);
  color: var(--muc);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: clamp(16px, .55vw + 14.5px, 18px);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

::selection { background: var(--nang); color: var(--muc); }

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--san);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 100;
  background: var(--muc);
  color: var(--trang);
  padding: 10px 18px;
  border-radius: var(--r-nho);
  font-weight: 600;
  text-decoration: none;
}
.skip:focus { left: 12px; }

/* ─── Khối dùng chung ─────────────────────────────────────── */

.wrap {
  width: 100%;
  max-width: var(--do-rong);
  margin-inline: auto;
  padding-inline: var(--le);
}
.wrap--narrow { max-width: 760px; }

.band { padding-block: clamp(72px, 11vw, 140px); }
.band--tint { background: var(--giay); }
.band--deep {
  background:
    radial-gradient(110% 85% at 15% 0%, #123FB4 0%, transparent 62%),
    radial-gradient(85% 70% at 92% 96%, #0B5CA8 0%, transparent 60%),
    var(--muc);
  color: var(--trang);
}

.eyebrow {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--troi);
  margin: 0 0 18px;
}
.eyebrow--dark { color: var(--bien); }

.h2 {
  font-family: "Bricolage Grotesque", "Be Vietnam Pro", sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 5.2vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -.025em;
  margin: 0 0 clamp(32px, 5vw, 54px);
  text-wrap: balance;
}
.h2--center { text-align: center; }
.h2--light { color: var(--trang); }

/* ─── Thanh trên cùng ─────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px var(--le);
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(14px);
  border-bottom: 1.5px solid rgba(7, 27, 62, .1);
}

.topbar__mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: -.02em;
  text-decoration: none;
}

.topbar__dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--bien);
  box-shadow: 0 0 0 4px rgba(11, 92, 246, .18);
}

.topbar__nav {
  display: flex;
  gap: clamp(14px, 3vw, 30px);
  font-size: .92rem;
  font-weight: 600;
}
.topbar__nav a {
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: border-color .2s, color .2s;
}
.topbar__nav a:hover { color: var(--bien); border-bottom-color: var(--bien); }

@media (max-width: 560px) {
  .topbar__nav a:nth-child(2) { display: none; }
}

/* ─── Hero ────────────────────────────────────────────────── */

.hero {
  position: relative;
  padding-block: clamp(56px, 9vw, 110px) clamp(72px, 10vw, 130px);
  overflow: hidden;
}

.hero__glow {
  position: absolute;
  inset: -30% -20% auto -20%;
  height: 130%;
  background:
    radial-gradient(46% 46% at 80% 20%, rgba(52, 210, 255, .42) 0%, transparent 70%),
    radial-gradient(44% 44% at 10% 12%, rgba(11, 92, 246, .28) 0%, transparent 70%),
    radial-gradient(30% 30% at 96% 6%, rgba(255, 197, 61, .30) 0%, transparent 70%),
    radial-gradient(34% 34% at 42% 96%, rgba(33, 212, 162, .18) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  width: 100%;
  max-width: var(--do-rong);
  margin-inline: auto;
  padding-inline: var(--le);
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(36px, 6vw, 76px);
  align-items: center;
}

.hero__name {
  font-family: "Bricolage Grotesque", "Be Vietnam Pro", sans-serif;
  font-weight: 800;
  font-size: clamp(3.1rem, 9.5vw, 6.4rem);
  line-height: .92;
  letter-spacing: -.045em;
  margin: 0 0 24px;
}
.hero__name-line { display: block; }
.hero__name-line--accent {
  color: var(--bien);
  width: fit-content;
  /* gạch chân màu nắng, vẽ bằng chính nền của dòng chữ */
  background-image: linear-gradient(var(--nang), var(--nang));
  background-size: 100% .13em;
  background-position: 0 88%;
  background-repeat: no-repeat;
}

.hero__lead {
  font-size: clamp(1.02rem, 1.4vw, 1.16rem);
  max-width: 46ch;
  margin: 0 0 34px;
  color: #26406E;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }

.btn {
  display: inline-block;
  padding: 14px 26px;
  border-radius: 99px;
  font-weight: 700;
  font-size: .96rem;
  text-decoration: none;
  border: var(--vien);
  transition: transform .18s var(--dai), box-shadow .18s var(--dai);
}
.btn--solid { background: var(--bien); color: var(--trang); box-shadow: var(--bong-nho); }
.btn--ghost { background: var(--trang); color: var(--muc); box-shadow: var(--bong-nho); }
.btn:hover { transform: translate(-3px, -3px); box-shadow: 9px 9px 0 var(--muc); }
.btn:active { transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--muc); }

/* ─── Thẻ giới thiệu (điểm nhấn của trang) ────────────────── */

.hero__card-slot { perspective: 1100px; }

.idcard {
  position: relative;
  background: var(--trang);
  border: var(--vien);
  border-radius: var(--r-lon);
  box-shadow: var(--bong);
  padding: 22px;
  max-width: 430px;
  margin-inline: auto;
  transform: rotate(-2deg);
  transform-style: preserve-3d;
  overflow: hidden;
  will-change: transform;
}

.idcard__shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 38%, rgba(255, 255, 255, .55) 50%, transparent 62%);
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.idcard:hover .idcard__shine { opacity: 1; }

.idcard__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  font-family: "JetBrains Mono", monospace;
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding-bottom: 14px;
  border-bottom: 2px dashed rgba(7, 27, 62, .22);
}
.idcard__title { font-weight: 700; color: var(--bien); }
.idcard__serial { color: #6B82AB; }

.idcard__body {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 20px;
  padding-block: 18px;
}

.idcard__photo {
  margin: 0;
  border: var(--vien);
  border-radius: var(--r-vua);
  overflow: hidden;
  background: linear-gradient(160deg, var(--troi), var(--bien));
  aspect-ratio: 3 / 4;
}
.idcard__photo img { width: 100%; height: 100%; object-fit: cover; }

.idcard__fields { margin: 0; display: grid; align-content: center; gap: 11px; }
.idcard__row { display: grid; gap: 1px; }
.idcard__row dt {
  font-family: "JetBrains Mono", monospace;
  font-size: .6rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #7B90B6;
}
.idcard__row dd {
  margin: 0;
  font-weight: 600;
  font-size: .96rem;
  line-height: 1.25;
}

.idcard__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  border-top: 2px dashed rgba(7, 27, 62, .22);
}
.idcard__stripe {
  flex: 1;
  height: 12px;
  border-radius: 99px;
  background: repeating-linear-gradient(
    90deg,
    var(--bien) 0 10px, var(--troi) 10px 18px,
    var(--la) 18px 24px, var(--nang) 24px 32px, var(--san) 32px 38px
  );
}
.idcard__sign {
  font-family: "Bricolage Grotesque", cursive;
  font-weight: 800;
  font-size: 1.5rem;
  font-style: italic;
  letter-spacing: -.03em;
  color: var(--bien);
  transform: rotate(-6deg);
}

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__text { text-align: center; }
  .hero__name-line--accent { margin-inline: auto; }
  .hero__lead { margin-inline: auto; }
  .hero__actions { justify-content: center; }
}
@media (max-width: 400px) {
  .idcard__body { grid-template-columns: 1fr; }
  .idcard__photo { max-width: 150px; margin-inline: auto; }
}

/* ─── Băng chữ chạy ───────────────────────────────────────── */

.ticker {
  background: var(--bien);
  color: var(--trang);
  border-block: var(--vien);
  padding-block: 13px;
  overflow: hidden;
}
.ticker__track {
  display: flex;
  width: max-content;
  animation: chay 30s linear infinite;
}
.ticker__group {
  display: flex;
  align-items: center;
  gap: 22px;
  padding-right: 22px;
  white-space: nowrap;
  font-family: "JetBrains Mono", monospace;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.ticker__group i { color: var(--nang); font-style: normal; }

@keyframes chay {
  to { transform: translateX(-50%); }
}

/* ─── Về mình ─────────────────────────────────────────────── */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 64px);
}
.about__head .h2 { margin-bottom: 0; font-size: clamp(1.9rem, 3.7vw, 2.9rem); }
.about__text p { margin: 0 0 20px; color: #2B4571; }
.about__text strong { color: var(--muc); font-weight: 700; }

.nowbox {
  grid-column: 1 / -1;
  margin-top: clamp(30px, 4vw, 46px);
  padding: 24px clamp(22px, 3vw, 32px) 28px;
  border: var(--vien);
  border-radius: var(--r-lon);
  background: var(--trang);
  box-shadow: var(--bong);
}

.nowbox__label {
  font-family: "JetBrains Mono", monospace;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--bien);
  margin: 0 0 16px;
}

.nowlist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr)); /* 4 mục → 2 hàng cân nhau */
  gap: 12px clamp(24px, 4vw, 56px);
}
@media (max-width: 640px) {
  .nowlist { grid-template-columns: 1fr; }
}
.nowlist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-weight: 500;
  line-height: 1.45;
}
.nowlist__dot {
  flex: none;
  width: 13px;
  height: 13px;
  margin-top: .42em;
  border-radius: 50%;
  border: 2px solid var(--muc);
}
.nowlist__dot--sea   { background: var(--bien); }
.nowlist__dot--sun   { background: var(--nang); }
.nowlist__dot--mint  { background: var(--la); }
.nowlist__dot--coral { background: var(--san); }

@media (max-width: 860px) {
  .about { grid-template-columns: 1fr; }
}

/* ─── Thẻ sở thích ────────────────────────────────────────── */

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
  gap: clamp(16px, 2.4vw, 26px);
}

.card {
  background: var(--trang);
  border: var(--vien);
  border-radius: var(--r-lon);
  box-shadow: var(--bong-nho);
  padding: 26px 24px 28px;
  transition: transform .22s var(--dai), box-shadow .22s var(--dai);
}
.card:hover { transform: translate(-4px, -4px); box-shadow: 10px 10px 0 var(--muc); }

.card__icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border: var(--vien);
  border-radius: var(--r-nho);
  margin-bottom: 18px;
  color: var(--muc);
}
.card__icon svg { width: 30px; height: 30px; }

.card__title {
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 800;
  font-size: 1.28rem;
  letter-spacing: -.02em;
  margin: 0 0 8px;
}
.card__text { margin: 0; color: #3A5382; font-size: .96rem; line-height: 1.55; }

.card--sea   .card__icon { background: var(--bien); color: var(--trang); }
.card--coral .card__icon { background: var(--san); color: var(--trang); }
.card--sun   .card__icon { background: var(--nang); }
.card--mint  .card__icon { background: var(--la); }
.card--sky   .card__icon { background: var(--troi); }
.card--deep  .card__icon { background: var(--muc); color: var(--trang); }

/* ─── Thẻ mô hình AI ──────────────────────────────────────── */

.ai__intro {
  max-width: 60ch;
  margin: -18px 0 clamp(32px, 5vw, 48px);
  color: rgba(255, 255, 255, .82);
  font-size: clamp(1rem, 1.3vw, 1.08rem);
}

.ai {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 22px);
}

.ai__card {
  display: flex;
  flex-direction: column;
  background: var(--trang);
  color: var(--muc); /* thẻ sáng nằm trên nền tối — phải đặt lại màu chữ */
  border: var(--vien);
  border-radius: var(--r-lon);
  box-shadow: 8px 8px 0 rgba(3, 12, 32, .55);
  padding: 24px 22px 26px;
  transition: transform .22s var(--dai), box-shadow .22s var(--dai);
}
.ai__card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 12px 12px 0 rgba(3, 12, 32, .55);
}

.ai__mark {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border: var(--vien);
  border-radius: var(--r-nho);
  margin-bottom: 18px;
  color: var(--muc);
}
.ai__mark svg { width: 30px; height: 30px; }

.ai__card--a .ai__mark { background: var(--bien); color: var(--trang); }
.ai__card--b .ai__mark { background: var(--troi); }
.ai__card--c .ai__mark { background: var(--nang); }
.ai__card--d .ai__mark { background: var(--la); }

.ai__lab {
  font-family: "JetBrains Mono", monospace;
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #7B90B6;
  margin: 0 0 6px;
}

.ai__name {
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 800;
  font-size: 1.18rem;
  letter-spacing: -.02em;
  line-height: 1.15;
  margin: 0 0 10px;
}

.ai__desc {
  margin: 0;
  color: #3A5382;
  font-size: .92rem;
  line-height: 1.5;
}

.ai__note {
  margin: clamp(26px, 4vw, 38px) 0 0;
  color: rgba(255, 255, 255, .62);
  font-size: .86rem;
  max-width: 62ch;
}

@media (max-width: 900px) {
  .ai { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  .ai { grid-template-columns: 1fr; }
}

/* ─── Lời cảm ơn ──────────────────────────────────────────── */

.thanks {
  position: relative;
  padding-block: clamp(84px, 13vw, 160px);
  text-align: center;
  background:
    radial-gradient(70% 110% at 50% -10%, rgba(52, 210, 255, .3) 0%, transparent 70%),
    linear-gradient(180deg, var(--giay) 0%, var(--trang) 100%);
  overflow: hidden;
}
.thanks::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: min(760px, 92vw);
  height: 5px;
  transform: translateX(-50%);
  border-radius: 0 0 99px 99px;
  background: linear-gradient(90deg, var(--bien), var(--troi), var(--la), var(--nang), var(--san));
}
.thanks .eyebrow { color: var(--bien); }

.thanks__title {
  font-family: "Bricolage Grotesque", "Be Vietnam Pro", sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 7.6vw, 4.6rem);
  line-height: .98;
  letter-spacing: -.04em;
  margin: 0 0 30px;
  color: var(--bien);
}

.thanks__body p {
  margin: 0 auto 18px;
  max-width: 56ch;
  color: #2B4571;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
}

.thanks__sign {
  display: inline-block;
  margin: 22px 0 0;
  padding: 11px 26px;
  border: var(--vien);
  border-radius: 99px;
  background: var(--trang);
  box-shadow: var(--bong-nho);
  font-family: "Bricolage Grotesque", sans-serif;
  font-weight: 800;
  font-size: 1.05rem;
}

/* ─── Chân trang ──────────────────────────────────────────── */

.foot {
  background: var(--muc);
  color: rgba(255, 255, 255, .72);
  padding-block: 26px;
  font-size: .85rem;
}
.foot__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
}
.foot__meta { font-family: "JetBrains Mono", monospace; font-size: .74rem; letter-spacing: .06em; }

/* ─── Hiệu ứng xuất hiện khi cuộn ─────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--dai), transform .7s var(--dai);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .ticker__track { animation: none; }
  .btn, .card, .pop__tile, .idcard { transition: none; }
  .card:hover, .btn:hover, .pop__tile:hover { transform: none; }
}