/* Sheeto - trang gioi thieu */

/* ------------------------------------------------------------ điều hướng */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.9); backdrop-filter: blur(14px);
  border-bottom: 2px solid var(--line);
}
.nav__in { display: flex; align-items: center; gap: 30px; height: 76px; }
.nav__links { display: flex; gap: 27px; margin-left: auto; font-weight: 600; font-size: 15px; color: var(--ink-2); }
.nav__links a { position: relative; padding: 4px 0; }
.nav__links a::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: var(--green); border-radius: 3px; transform: scaleX(0);
  transition: transform .22s var(--ease); transform-origin: left;
}
.nav__links a:hover { color: var(--green-dd); }
.nav__links a:hover::after { transform: scaleX(1); }
.nav__cta { display: flex; gap: 10px; align-items: center; }
@media (max-width: 940px) { .nav__links { display: none; } .nav__in { gap: 14px; } .nav__cta { margin-left: auto; } }
@media (max-width: 520px) { .nav__cta .btn--ghost { display: none; } }

/* ------------------------------------------------------------ hero */
.hero {
  position: relative; padding: 66px 0 46px; overflow: hidden;
  background:
    radial-gradient(900px 460px at 10% -10%, var(--green-soft) 0%, transparent 62%),
    radial-gradient(760px 440px at 94% 2%, var(--blue-soft) 0%, transparent 58%);
}
.hero__in { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 1.04fr; gap: 52px; align-items: center; }
.hero h1 { margin-bottom: 18px; }
.hero h1 u { text-decoration: none; position: relative; white-space: nowrap; z-index: 1; }
.hero h1 u::after {
  content: ''; position: absolute; left: -3%; right: -3%; bottom: 5px; height: 34%;
  background: var(--amber); border-radius: 7px; z-index: -1; transform: rotate(-1.4deg) scaleX(0);
  transform-origin: left; animation: shHi .7s .55s var(--ease) forwards;
}
@keyframes shHi { to { transform: rotate(-1.4deg) scaleX(1); } }
.hero__sub { font-size: 18.5px; max-width: 31em; }
.hero__cta { display: flex; gap: 13px; flex-wrap: wrap; margin: 26px 0 16px; }
.hero__note { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); font-weight: 600; }
.hero__stats { display: flex; gap: 30px; margin-top: 28px; flex-wrap: wrap; }
.hero__stats div b {
  font-family: var(--fh); font-size: 27px; display: block; line-height: 1;
  font-variant-numeric: tabular-nums; color: var(--ink);
}
.hero__stats div span { font-size: 13px; color: var(--muted); font-weight: 600; }
@media (max-width: 1000px) {
  .hero__in { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .hero__copy, .demo { min-width: 0; }
  .demo .ms-wrap { overflow-x: auto; }
}

/* khung demo */
.demo {
  position: relative;
  background: #fff; border: 2px solid var(--line); border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg); overflow: visible;
}
.demo__mascot { position: absolute; top: -42px; right: 18px; z-index: 3; height: auto; }
@media (max-width: 1000px) { .demo__mascot { width: 54px; top: -32px; right: 10px; } }
.demo__top {
  display: flex; align-items: center; gap: 11px; padding: 13px 17px;
  background: var(--bg-2); border-bottom: 2px solid var(--line);
  border-radius: calc(var(--r-xl) - 2px) calc(var(--r-xl) - 2px) 0 0;
}
.demo__dots { display: flex; gap: 6px; }
.demo__dots i { width: 11px; height: 11px; border-radius: 50%; background: var(--line-2); display: block; }
.demo__dots i:first-child { background: #FFB4B4; }
.demo__dots i:nth-child(2) { background: #FFDFA8; }
.demo__dots i:last-child { background: #A9E7C4; }
.demo__title { font-weight: 700; font-size: 13.5px; color: var(--ink-2); }
.demo__body { padding: 17px; }
.demo__task {
  display: flex; gap: 12px; align-items: flex-start; margin-bottom: 14px;
  background: var(--blue-soft); border-radius: var(--r); padding: 13px 15px;
}
.demo__task-ico { font-size: 20px; line-height: 1.2; flex: 0 0 auto; }
.demo__task p { margin: 0; font-size: 14.5px; color: var(--ink-2); }
.demo__task code {
  font-family: var(--fm); background: #fff; border: 1px solid var(--line-2);
  border-radius: 6px; padding: 1px 6px; font-size: 13px; color: var(--violet-d); font-weight: 600;
}
.demo__foot { display: flex; align-items: center; gap: 13px; margin-top: 14px; flex-wrap: wrap; }
.demo__msg { font-weight: 700; font-size: 14.2px; flex: 1; min-width: 200px; }
.demo__msg.ok { color: var(--green-dd); }
.demo__msg.no { color: var(--coral-d); }

/* ------------------------------------------------------------ dải công thức chạy */
.ticker {
  overflow: hidden; border-block: 2px solid var(--line); background: var(--bg-2);
  padding: 13px 0; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
          mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.ticker__row { display: flex; gap: 12px; width: max-content; animation: shTicker 42s linear infinite; }
.ticker:hover .ticker__row { animation-play-state: paused; }
@keyframes shTicker { to { transform: translateX(-50%); } }
.ticker__i {
  font-family: var(--fm); font-size: 13.5px; font-weight: 600; color: var(--ink-2);
  background: #fff; border: 2px solid var(--line); border-radius: 11px;
  padding: 7px 14px; white-space: nowrap;
}
.ticker__i b { color: var(--green-dd); font-weight: 600; }

/* ------------------------------------------------------------ khối chung */
/* .reveal--left/--right day phan tu lech 24px cho toi khi hien ra, gay tran ngang
   trong luc do. Cat o day thay vi bo hieu ung. */
.sec { padding: 84px 0; overflow-x: clip; }
.sec--alt { background: var(--bg-2); }
.sec__head { max-width: 660px; margin: 0 auto 48px; text-align: center; }
.sec__head p { font-size: 17.5px; }
.eyebrow {
  font-family: var(--fb); font-weight: 800; letter-spacing: .15em; text-transform: uppercase;
  font-size: 12.5px; color: var(--green-d); margin-bottom: 11px;
}

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 940px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: #fff; border: 2px solid var(--line); border-radius: var(--r-lg);
  padding: 27px 25px; box-shadow: 0 4px 0 var(--line);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 0 var(--line); }
.card__ico {
  width: 54px; height: 54px; border-radius: 17px; display: grid; place-items: center;
  font-size: 26px; margin-bottom: 15px; background: var(--bg-3);
}
.card h3 { margin-bottom: 8px; font-size: 20px; }
.card p { margin: 0; font-size: 15px; }
.card--pain .card__ico { background: var(--coral-soft); }
.card--pain h3 { color: var(--coral-d); }

/* ------------------------------------------------------------ ba bước */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
@media (max-width: 940px) { .steps { grid-template-columns: 1fr; } }
.step__n {
  width: 48px; height: 48px; border-radius: 16px; display: grid; place-items: center;
  font-family: var(--fh); font-weight: 800; font-size: 22px; color: #fff;
  background: var(--green); box-shadow: 0 4px 0 var(--green-dd); margin-bottom: 15px;
}
.step:nth-child(2) .step__n { background: var(--blue); box-shadow: 0 4px 0 var(--blue-d); }
.step:nth-child(3) .step__n { background: var(--violet); box-shadow: 0 4px 0 var(--violet-d); }
.step h3 { font-size: 20px; }
.step p { font-size: 15px; margin: 0; }

/* ------------------------------------------------------------ tính năng */
.feat { display: grid; grid-template-columns: 1.05fr minmax(0, 1fr); gap: 58px; align-items: center; }
.feat + .feat { margin-top: 88px; }
.feat--flip .feat__media { order: -1; }
@media (max-width: 940px) { .feat { grid-template-columns: 1fr; gap: 28px; } .feat--flip .feat__media { order: 0; } }
.feat h3 { font-size: 26px; }
.feat ul { list-style: none; padding: 0; margin: 18px 0 0; }
.feat li {
  position: relative; padding-left: 34px; margin-bottom: 12px;
  font-size: 15.5px; color: var(--ink-2); line-height: 1.62;
}
.feat li::before {
  content: '✓'; position: absolute; left: 0; top: 2px;
  width: 23px; height: 23px; border-radius: 8px;
  background: var(--green-soft); color: var(--green-dd); font-weight: 800; font-size: 12.5px;
  display: grid; place-items: center;
}
.feat__media {
  background: #fff; border: 2px solid var(--line); border-radius: var(--r-lg);
  padding: 19px; box-shadow: var(--shadow); min-width: 0;
}
.mock-fb { border-radius: var(--r); padding: 16px 18px; display: flex; gap: 13px; align-items: flex-start; }
.mock-fb__ico { font-size: 26px; line-height: 1; flex: 0 0 auto; }
.mock-fb--ok { background: var(--green-soft); }
.mock-fb--no { background: var(--coral-soft); }
.mock-fb b { font-family: var(--fh); font-size: 18px; display: block; }
.mock-fb--ok b { color: var(--green-dd); }
.mock-fb--no b { color: var(--coral-d); }
.mock-fb span { font-size: 14px; color: var(--ink-2); }
.mock-fb + .mock-fb { margin-top: 12px; }
.hintlad { display: grid; gap: 10px; }
.hintlad div {
  border: 2px solid var(--line); border-radius: var(--r); padding: 13px 15px;
  font-size: 14.8px; background: #fff; color: var(--ink-2); line-height: 1.55;
}
.hintlad b { margin-right: 7px; }
.hintlad div.is-locked { opacity: .5; }
.hintlad b { font-family: var(--fh); color: var(--ink); }
.hintlad code { font-family: var(--fm); font-size: 13.5px; color: var(--violet-d); }

/* ------------------------------------------------------------ lộ trình */
.path { max-width: 580px; margin: 0 auto; position: relative; }
.path__row { display: flex; align-items: center; gap: 22px; padding: 11px 0; }
.path__row:nth-child(even) { padding-left: 92px; }
@media (max-width: 620px) { .path__row:nth-child(even) { padding-left: 34px; } }
.node {
  position: relative; flex: 0 0 auto;
  width: 80px; height: 76px; border-radius: 30px;
  display: grid; place-items: center; font-size: 30px; color: #fff;
  background: var(--green); box-shadow: 0 7px 0 var(--green-dd);
  border: 0; cursor: pointer; transition: transform .12s var(--ease), box-shadow .12s var(--ease);
}
.node:hover { transform: translateY(-2px); }
.node:active { transform: translateY(7px); box-shadow: 0 0 0 var(--green-dd); }
.node--blue   { background: var(--blue);   box-shadow: 0 7px 0 var(--blue-d); }
.node--violet { background: var(--violet); box-shadow: 0 7px 0 var(--violet-d); }
.node--lock   { background: var(--bg-3);   box-shadow: 0 7px 0 var(--line-2); color: var(--muted); }
.node--done::after {
  content: '✓'; position: absolute; right: -6px; bottom: -6px;
  width: 28px; height: 28px; border-radius: 50%; background: var(--green-dd);
  color: #fff; font-size: 15px; display: grid; place-items: center;
  border: 3px solid var(--bg-2); font-weight: 800;
}
.node__crown {
  position: absolute; top: -11px; right: -10px; background: var(--amber);
  color: #4A3200; font-size: 10.5px; font-weight: 800;
  padding: 3px 9px; border-radius: 999px; box-shadow: 0 2px 0 var(--amber-d); letter-spacing: .04em;
}
.path__txt h4 { font-family: var(--fh); font-size: 19px; margin: 0 0 2px; }
.path__txt p { margin: 0; font-size: 14.5px; color: var(--muted); }
.path__txt .chip { margin-top: 7px; }

/* ------------------------------------------------------------ bảng giá */
.price { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: stretch; }
@media (max-width: 980px) { .price { grid-template-columns: 1fr; } .plan--hot { transform: none; } }
.plan {
  background: #fff; border: 2px solid var(--line); border-radius: var(--r-lg);
  padding: 28px 26px; display: flex; flex-direction: column; box-shadow: 0 4px 0 var(--line);
}
.plan--hot {
  border-color: var(--green); box-shadow: 0 6px 0 var(--green-dd);
  position: relative; transform: translateY(-8px);
}
.plan__tag {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--green); color: #fff; font-family: var(--fh); font-weight: 800;
  font-size: 13px; padding: 4px 17px; border-radius: 999px; white-space: nowrap;
  box-shadow: 0 3px 0 var(--green-dd);
}
.plan h3 { font-size: 21px; margin-bottom: 4px; }
.plan__for { font-size: 13.5px; color: var(--muted); margin-bottom: 16px; min-height: 42px; }
.plan__p { font-family: var(--fh); font-size: 37px; font-weight: 800; line-height: 1; }
.plan__p small { font-size: 15px; font-weight: 700; color: var(--muted); font-family: var(--fb); }
.plan__p2 { font-size: 13.5px; color: var(--muted); margin: 7px 0 18px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 22px; }
.plan li {
  position: relative; padding-left: 22px; font-size: 14.8px;
  margin-bottom: 10px; color: var(--ink-2); line-height: 1.55;
}
.plan li::before { content: '✓'; position: absolute; left: 0; top: 0; color: var(--green-d); font-weight: 800; }
.plan li.no { color: var(--muted); }
.plan li.no::before { content: '·'; color: var(--muted); }
.plan .btn { margin-top: auto; }
.price__note {
  margin-top: 28px; text-align: center; font-size: 14.5px; color: #6B4A00;
  background: var(--amber-soft); border-radius: var(--r); padding: 15px 20px;
}

/* ------------------------------------------------------------ B2B */
.b2b {
  background: linear-gradient(135deg, #0B1A15, #16302A);
  color: #fff; border-radius: var(--r-xl); padding: 54px 50px;
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 44px; align-items: center;
}
@media (max-width: 940px) { .b2b { grid-template-columns: 1fr; padding: 34px 26px; } }
.b2b h2 { color: #fff; }
.b2b p { color: #A9BDB5; }
.b2b__list { list-style: none; padding: 0; margin: 22px 0 0; }
.b2b__list li { display: flex; gap: 12px; margin-bottom: 13px; color: #D6E4DE; font-size: 15.5px; }
.b2b__list li i {
  flex: 0 0 auto; width: 23px; height: 23px; border-radius: 8px; background: rgba(0,191,111,.22);
  color: #4BE49C; display: grid; place-items: center; font-style: normal; font-weight: 800; font-size: 12px;
  margin-top: 3px;
}
.b2b__list li b { color: #fff; }
.b2b__card {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--r-lg); padding: 26px;
}
.b2b__card h4 { font-family: var(--fh); font-size: 18px; margin: 0 0 14px; color: #fff; }
.b2b__row {
  display: flex; justify-content: space-between; gap: 12px; font-size: 14.5px;
  padding: 10px 0; border-bottom: 1px dashed rgba(255,255,255,.15); color: #BACCC5;
}
.b2b__row:last-of-type { border: 0; }
.b2b__row b { color: var(--amber); white-space: nowrap; }

/* ------------------------------------------------------------ FAQ */
.faq { max-width: 780px; margin: 0 auto; }
.faq details {
  background: #fff; border: 2px solid var(--line); border-radius: var(--r);
  padding: 17px 21px; margin-bottom: 12px; transition: border-color .18s var(--ease);
}
.faq details[open] { border-color: var(--green); }
.faq summary {
  font-family: var(--fh); font-weight: 700; font-size: 17.5px; cursor: pointer;
  list-style: none; display: flex; justify-content: space-between; gap: 14px; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 25px; color: var(--green-d); line-height: 1; }
.faq details[open] summary::after { content: '−'; }
.faq p { margin: 12px 0 0; font-size: 15.5px; }

/* ------------------------------------------------------------ CTA + chân trang */
.cta-final { position: relative; text-align: center; padding: 92px 0; overflow: hidden; }
.cta-final .wrap { position: relative; z-index: 1; }
.foot { background: var(--ink); color: #93A8A0; padding: 48px 0 34px; font-size: 14.5px; }
.foot__in { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.foot a { color: #C6D6D0; }
.foot a:hover { color: #fff; }
.foot__cols { display: flex; gap: 58px; flex-wrap: wrap; }
.foot__col h5 { font-family: var(--fh); color: #fff; font-size: 15px; margin: 0 0 10px; }
.foot__col div { margin-bottom: 7px; }
.foot__bot { border-top: 1px solid #21332C; margin-top: 32px; padding-top: 20px; font-size: 13px; }

/* ============================================================
   Ba khối tương tác ở giữa trang (demo khoá $, thang gợi ý, phím tắt)
   ============================================================ */
.feat__thu {
  margin-top: 14px; font-size: 14px; font-weight: 700; color: var(--green-dd);
}

/* ------------------------------------------------ demo bài khoá $ */
.demo2__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 11px; }
.demo2__ref {
  font-family: var(--fm); font-size: 12px; font-weight: 800; color: var(--muted);
  background: var(--bg-2); border-radius: 7px; padding: 3px 9px;
}
.demo2__de { font-size: 14.4px; line-height: 1.6; margin: 0 0 13px; color: var(--ink-2); }
.demo2__de code {
  font-family: var(--fm); font-size: 13px; background: var(--bg-2);
  border-radius: 5px; padding: 1px 5px; color: var(--violet-d);
}
.demo2__foot { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 13px; }
.demo2__msg {
  margin-top: 11px; font-size: 13.8px; line-height: 1.6; border-radius: var(--r);
  padding: 0; max-height: 0; overflow: hidden; transition: max-height .25s ease, padding .25s ease;
}
.demo2__msg.ok, .demo2__msg.no, .demo2__msg.goiy {
  padding: 11px 13px; max-height: 220px; animation: shPop .22s var(--ease);
}
.demo2__msg.ok { background: var(--green-tint); color: var(--green-dd); border: 2px solid var(--green-soft); }
.demo2__msg.no { background: var(--coral-soft); color: var(--coral-d); border: 2px solid rgba(255,90,95,.28); }
.demo2__msg.goiy { background: #FFFBF0; color: #6B4A00; border: 2px solid #FFE6B0; }
.demo2__msg code { font-family: var(--fm); font-size: 13px; }

/* ------------------------------------------------ thang gợi ý bấm được */
.hintlad__de {
  font-size: 13.6px; color: var(--muted); background: var(--bg-2) !important;
  border-style: dashed !important;
}
.hintlad__i {
  opacity: .34; filter: blur(2.4px); transform: translateY(4px);
  transition: opacity .28s var(--ease), filter .28s var(--ease), transform .28s var(--ease);
  user-select: none;
}
.hintlad__i.is-mo { opacity: 1; filter: none; transform: none; }
.hintlad__i[data-nac="3"] { border-color: var(--violet) !important; }
.hintlad__i[data-nac="3"] b { color: var(--violet-d); }
.hintlad__i[data-nac="3"] code::after {
  content: '▌'; color: var(--violet); animation: nhayCon .7s steps(1) infinite;
}
.hintlad__i.is-mo[data-nac="3"] code:empty::after { content: '▌'; }
@keyframes nhayCon { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }
.hintlad .btn { margin-top: 4px; }

/* ------------------------------------------------ luyện phím tắt */
.phim { display: grid; gap: 9px; outline: 0; border-radius: var(--r); }
.phim.is-nghe { box-shadow: 0 0 0 3px rgba(24,201,100,.22); }
.phim__head {
  font-size: 12px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase;
  color: var(--muted);
}
.phim__i {
  display: flex; align-items: center; gap: 12px; position: relative;
  border: 2px solid var(--line); border-radius: var(--r); padding: 11px 14px;
  background: #fff; transition: .18s var(--ease);
}
.phim__i b {
  font-family: var(--fm); font-size: 13px; font-weight: 800; color: var(--ink);
  background: var(--bg-2); border: 1px solid var(--line); border-bottom-width: 3px;
  border-radius: 7px; padding: 4px 9px; flex: 0 0 auto; min-width: 84px; text-align: center;
}
.phim__i span { font-size: 13.6px; color: var(--ink-2); flex: 1; }
.phim__i i {
  width: 22px; height: 22px; flex: 0 0 auto; border-radius: 50%;
  border: 2px solid var(--line); transition: .18s var(--ease);
}
.phim__i.is-ok { border-color: var(--green); background: var(--green-tint); }
.phim__i.is-ok b { border-color: var(--green-soft); background: #fff; }
.phim__i.is-ok i {
  border-color: var(--green); background: var(--green);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3.4 3.4L15 7.2' fill='none' stroke='%23fff' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: 100%; transform: scale(1.12);
}
.phim__foot { font-size: 13px; color: var(--muted); margin-top: 3px; min-height: 20px; }
.phim.is-xong .phim__foot { color: var(--green-dd); font-weight: 700; }
@media (max-width: 480px) {
  .phim__i { flex-wrap: wrap; }
  .phim__i span { flex: 1 1 100%; }
}

/* Bảng tính trong khối tính năng hẹp hơn khối bài học — cho nó tự cuộn trong khung */
.demo2 .ms-wrap { overflow-x: auto; }
.demo2 { min-width: 0; }