/* AIPhoto — trang giới thiệu công khai. Ai cũng xem được; muốn dùng phải đăng nhập. */
:root {
  --bg: #0d1016;
  --bg-soft: #12161e;
  --panel: #161b24;
  --panel-2: #1c222d;
  --border: #262f3d;
  --text: #eaeff7;
  --muted: #94a1b4;
  --accent: #e0a96d;
  --accent-2: #f4d0a1;
  --good: #6fd0a0;
  --bad: #e5736b;
  --radius: 16px;
  --shadow: 0 18px 50px rgba(0, 0, 0, .35);
}
:root[data-theme="light"] {
  --bg: #fdfaf6; --bg-soft: #f5efe7; --panel: #ffffff; --panel-2: #faf6f0;
  --border: #e8ded0; --text: #241f1a; --muted: #7a6f63;
  --accent: #b07d43; --accent-2: #8c6234; --shadow: 0 18px 50px rgba(120, 90, 50, .10);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #fdfaf6; --bg-soft: #f5efe7; --panel: #ffffff; --panel-2: #faf6f0;
    --border: #e8ded0; --text: #241f1a; --muted: #7a6f63;
    --accent: #b07d43; --accent-2: #8c6234; --shadow: 0 18px 50px rgba(120, 90, 50, .10);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
  line-height: 1.65; -webkit-font-smoothing: antialiased;
}
.wrap { width: min(1080px, 90vw); margin: 0 auto; }
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; letter-spacing: -.02em; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); }
.hl { color: var(--accent); }

/* ---------------- thanh trên ---------------- */
.top {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px); border-bottom: 1px solid var(--border);
}
.top-inner { display: flex; align-items: center; gap: 16px; height: 66px; }
.logo {
  display: flex; align-items: center; gap: 10px; color: var(--text);
  text-decoration: none; font-size: 17px; font-weight: 600; letter-spacing: -.01em;
}
.logo b { color: var(--accent); font-weight: 800; }
.logo-mark {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 11px;
  background: linear-gradient(140deg, var(--accent), var(--accent-2)); font-size: 19px;
}
.top-nav { margin-left: auto; display: flex; align-items: center; gap: 24px; }
.top-nav a { color: var(--muted); text-decoration: none; font-size: 14.5px; }
.top-nav a:hover { color: var(--text); }
.btn-login {
  border: 1px solid var(--accent); background: transparent; color: var(--accent);
  padding: 9px 22px; border-radius: 999px; font-size: 14px; font-weight: 650;
  cursor: pointer; font-family: inherit; white-space: nowrap; transition: .18s;
}
.btn-login:hover { background: var(--accent); color: var(--bg); }

/* ---------------- nút ---------------- */
.btn-primary {
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  color: #1c1206; border: 0; padding: 13px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 700; cursor: pointer; font-family: inherit;
  transition: .18s; box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 28%, transparent);
}
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.06); }
.btn-primary.big { padding: 16px 40px; font-size: 16.5px; }
.btn-primary.wide { width: 100%; margin-top: 6px; }
.btn-ghost {
  border: 1px solid var(--border); background: var(--panel); color: var(--text);
  padding: 15px 28px; border-radius: 999px; font-size: 15px; text-decoration: none;
  display: inline-block; transition: .18s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------- hero ---------------- */
.hero {
  padding: 92px 0 74px; text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; top: -180px; left: 50%; transform: translateX(-50%);
  width: 780px; height: 460px; pointer-events: none;
  background: radial-gradient(ellipse at center,
    color-mix(in srgb, var(--accent) 16%, transparent), transparent 68%);
}
.hero .wrap { position: relative; }
.badge {
  display: inline-block; padding: 7px 18px; border-radius: 999px; margin-bottom: 26px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 38%, transparent);
  color: var(--accent); font-size: 13px; font-weight: 600;
}
.hero h1 { font-size: clamp(29px, 4.7vw, 52px); font-weight: 780; }
.lead {
  color: var(--muted); font-size: clamp(15px, 1.7vw, 18.5px);
  max-width: 640px; margin: 20px auto 0;
}
.hero-actions {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 34px;
}
.hero-note { color: var(--muted); font-size: 13px; margin-top: 18px; min-height: 20px; }

/* ---------------- khung chung ---------------- */
.section { padding: 78px 0; }
.section.alt { background: var(--bg-soft); border-block: 1px solid var(--border); }
.sec-title {
  font-size: clamp(22px, 2.9vw, 33px); text-align: center; margin-bottom: 52px; font-weight: 730;
}
.sec-title .muted { font-weight: 500; }
.bolt { color: var(--accent); }

/* ---------------- khối tính năng ---------------- */
.feat {
  display: grid; grid-template-columns: 132px 1fr; gap: 8px; align-items: start;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 38px 40px; margin-bottom: 22px; position: relative; overflow: hidden;
}
.feat::after {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 4px;
  background: linear-gradient(180deg, var(--accent), transparent);
}
.feat.alt { background: var(--panel-2); }
.feat-num {
  font-size: 62px; font-weight: 800; line-height: 1; letter-spacing: -.05em;
  color: transparent; -webkit-text-stroke: 1.5px color-mix(in srgb, var(--accent) 58%, transparent);
}
.feat-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.feat-ico {
  display: grid; place-items: center; width: 42px; height: 42px; flex: 0 0 42px;
  border-radius: 12px; font-size: 21px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.feat h3 { font-size: clamp(18px, 2.1vw, 23px); margin: 0; }
.feat-lead { color: var(--text); font-weight: 600; font-size: 15.5px; }
.feat p { color: var(--muted); font-size: 15px; }
.feat-lead { color: var(--text); }
.ticks { list-style: none; margin: 18px 0; padding: 0; }
.ticks li {
  position: relative; padding-left: 28px; margin-bottom: 9px;
  color: var(--muted); font-size: 14.5px;
}
.ticks li::before {
  content: "✓"; position: absolute; left: 0; top: -1px; color: var(--accent);
  font-weight: 800; font-size: 15px;
}
.ticks b { color: var(--text); }
.feat-kick {
  margin: 20px 0 0; padding: 14px 18px 14px 44px; border-radius: 12px; position: relative;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  color: var(--text) !important; font-weight: 650; font-size: 15px;
}
.feat-kick::before {
  content: "→"; position: absolute; left: 18px; color: var(--accent); font-weight: 800;
}
.mini-flow {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 4px 0 16px;
}
.mini-flow span {
  padding: 7px 16px; border-radius: 999px; background: var(--bg);
  border: 1px solid var(--border); font-size: 14px; font-weight: 600;
}
.mini-flow i { color: var(--accent); font-style: normal; font-weight: 800; }

/* ---------------- chuỗi quy trình ---------------- */
.chain {
  list-style: none; margin: 0 auto 46px; padding: 0; max-width: 620px;
  counter-reset: c;
}
.chain li {
  display: flex; align-items: center; gap: 16px; padding: 15px 22px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 13px;
  position: relative; font-size: 15.5px;
}
.chain li + li { margin-top: 30px; }
.chain li + li::before {
  content: ""; position: absolute; left: 41px; top: -25px; width: 2px; height: 20px;
  background: linear-gradient(180deg, transparent, var(--accent));
}
.chain li + li::after {
  content: ""; position: absolute; left: 37px; top: -8px;
  border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 7px solid var(--accent);
}
.chain-ico {
  display: grid; place-items: center; width: 38px; height: 38px; flex: 0 0 38px;
  border-radius: 11px; font-size: 18px; background: var(--bg-soft); border: 1px solid var(--border);
}
.chain li.done {
  border-color: color-mix(in srgb, var(--good) 55%, transparent);
  background: color-mix(in srgb, var(--good) 10%, transparent);
}
.chain li.done .chain-ico { background: color-mix(in srgb, var(--good) 18%, transparent); }

.save {
  display: flex; align-items: center; gap: 26px; flex-wrap: wrap; justify-content: center;
  max-width: 620px; margin: 0 auto; padding: 30px 32px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}
.save-num {
  font-size: 62px; font-weight: 820; line-height: 1; letter-spacing: -.04em;
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.save-num span { font-size: 30px; }
.save-text { flex: 1; min-width: 220px; }
.save-text b { font-size: 17px; display: block; margin-bottom: 4px; }
.save-text p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* ---------------- bảng giá ---------------- */
.price-note {
  text-align: center; color: var(--muted); font-size: 14.5px;
  max-width: 620px; margin: -32px auto 34px;
}
.price-note b { color: var(--text); }
.plans {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); gap: 16px;
  align-items: stretch;
}
.plan {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 22px; display: flex; flex-direction: column; position: relative;
}
.plan.free { background: transparent; border-style: dashed; }
.plan.featured {
  border-color: var(--accent); border-width: 2px;
  box-shadow: 0 14px 40px color-mix(in srgb, var(--accent) 16%, transparent);
}
.plan-flag {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(140deg, var(--accent), var(--accent-2)); color: #1c1206;
  font-size: 11px; font-weight: 750; padding: 4px 14px; border-radius: 999px;
  white-space: nowrap; letter-spacing: .02em;
}
.plan-tag {
  font-size: 12px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.plan-price { font-size: 30px; font-weight: 800; letter-spacing: -.03em; line-height: 1.1; }
.plan-price span { font-size: 17px; font-weight: 650; margin-left: 2px; }
.plan-sub { color: var(--muted); font-size: 13px; margin: 5px 0 18px; }
.plan ul { list-style: none; margin: 0 0 22px; padding: 0; font-size: 13.5px; }
.plan li {
  padding-left: 22px; position: relative; margin-bottom: 9px; color: var(--text);
}
.plan li::before {
  content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 800;
}
.plan li i { color: var(--muted); font-style: normal; font-size: 12px; }
.plan-btn { margin-top: auto; cursor: pointer; font-family: inherit; }
button.btn-ghost.wide {
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  padding: 12px 20px; border-radius: 999px; font-size: 14.5px;
}
button.btn-ghost.wide:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary.wide, .btn-ghost.wide { width: 100%; text-align: center; }
.price-fine { text-align: center; color: var(--muted); font-size: 13px; margin-top: 26px; }

/* ---------------- giới thiệu / hoa hồng ---------------- */
.hh-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px;
}
.hh-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; text-align: center;
}
.hh-card.featured { border-color: var(--accent); }
.hh-num {
  font-size: 46px; font-weight: 820; letter-spacing: -.03em; line-height: 1;
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hh-num span { font-size: 24px; }
.hh-ico { font-size: 40px; line-height: 1; }
.hh-card b { display: block; margin: 12px 0 6px; font-size: 16px; }
.hh-card p { color: var(--muted); font-size: 13.5px; margin: 0; }

/* ---------------- bảng giá gọn trong hộp đăng nhập ---------------- */
.modal-plans {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px;
  padding: 13px 15px; margin-bottom: 18px;
}
.mp-title {
  font-size: 11.5px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 9px;
}
.mp-row {
  display: flex; align-items: baseline; gap: 8px; font-size: 13px; padding: 5px 0;
  border-bottom: 1px dashed var(--border);
}
.mp-row:last-child { border-bottom: 0; }
.mp-row .mp-ten { font-weight: 650; min-width: 92px; }
.mp-row .mp-luot { color: var(--muted); font-size: 12px; flex: 1; }
.mp-row .mp-gia { font-weight: 750; color: var(--accent); white-space: nowrap; }
.mp-row.free .mp-gia { color: var(--good); }

/* ---------------- form đăng ký trong hộp đăng nhập ---------------- */
.tuy-chon { color: var(--muted); font-weight: 400; }
.code-note { color: var(--muted); font-size: 13px; margin: 0 0 14px; text-align: center; }
.code-note b { color: var(--text); }
/* Cụ thể hơn `.modal form input` để không bị quy tắc chung đè mất cỡ chữ lớn */
.modal form input.code-input {
  width: 100%; text-align: center; font-size: 28px; font-weight: 700;
  letter-spacing: .38em; text-indent: .38em; padding: 15px 13px; margin-top: 0;
  border-radius: 12px; border: 2px solid var(--border);
  background: var(--bg-soft); color: var(--text); font-family: Consolas, monospace;
}
.modal form input.code-input::placeholder { letter-spacing: .38em; opacity: .35; }
.code-actions { display: flex; justify-content: space-between; margin-top: 12px; }
.link-btn {
  background: none; border: 0; color: var(--accent); font-size: 13px; cursor: pointer;
  font-family: inherit; padding: 0; text-decoration: underline;
}
.link-btn:disabled { color: var(--muted); cursor: default; text-decoration: none; }
.modal-switch {
  margin-top: 16px; padding-top: 15px; border-top: 1px solid var(--border);
  text-align: center; font-size: 13px; color: var(--muted);
}
.modal-switch .link-btn { margin-left: 5px; font-size: 13px; font-weight: 650; }

/* ---------------- CTA + chân trang ---------------- */
.cta { text-align: center; }
.cta { padding: 58px 0 70px; }
.foot {
  border-top: 1px solid var(--border); padding: 28px 0; text-align: center;
  color: var(--muted); font-size: 13px;
}

/* ---------------- hộp đăng nhập ---------------- */
.modal-back {
  position: fixed; inset: 0; z-index: 100; display: flex; align-items: center;
  justify-content: center; padding: 20px; background: rgba(0, 0, 0, .66);
  backdrop-filter: blur(4px);
}
.modal {
  position: relative; width: 408px; max-width: 100%; background: var(--panel);
  border: 1px solid var(--border); border-radius: 20px; padding: 30px 30px 26px;
  box-shadow: var(--shadow); max-height: 92vh; overflow-y: auto;
}
.modal-sub {
  color: var(--muted); font-size: 13px; margin: -12px 0 20px; line-height: 1.55;
}
/* Họ tên + SĐT nằm cạnh nhau cho gọn, màn hẹp thì tự xuống dòng */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
@media (max-width: 420px) { .form-row { grid-template-columns: 1fr; } }
.modal-x {
  position: absolute; top: 14px; right: 14px; background: transparent; border: 0;
  color: var(--muted); font-size: 17px; cursor: pointer; line-height: 1;
}
.modal-x:hover { color: var(--text); }
.modal-head { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.modal-head h2 { margin: 0; font-size: 19px; }
.btn-google {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
  background: #fff; color: #1f1f1f; border: 1px solid #dadce0; border-radius: 999px;
  padding: 12px 18px; font-size: 14.5px; font-weight: 600; cursor: pointer; font-family: inherit;
}
.btn-google:hover { background: #f3f4f6; }
.or { display: flex; align-items: center; gap: 12px; margin: 18px 0; color: var(--muted); font-size: 12px; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--border); }
/* Áp cho MỌI form trong hộp (đăng nhập, đăng ký, nhập mã) — trước đây chỉ áp cho
   #pw-form nên form đăng ký bị nhãn dính vào ô nhập. */
.modal form label {
  display: block; font-size: 12.5px; font-weight: 600; color: var(--muted);
  margin-bottom: 14px; letter-spacing: .01em;
}
.modal form input {
  display: block; width: 100%; margin-top: 6px; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
  font-size: 14.5px; font-family: inherit; font-weight: 400; transition: .15s;
}
.modal form input::placeholder { color: var(--muted); opacity: .65; }
.modal form input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.modal form input:not(:placeholder-shown):valid { border-color: var(--border); }
.modal form .btn-primary { margin-top: 6px; }
.modal-msg { margin-top: 12px; font-size: 13px; color: var(--bad); text-align: center; min-height: 18px; }
.alert {
  background: color-mix(in srgb, var(--bad) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--bad) 45%, transparent);
  color: var(--text); border-radius: 11px; padding: 12px 14px; font-size: 13px; margin-bottom: 16px;
}
/* Cùng hộp đó nhưng là lời hướng dẫn, không phải lỗi — đỏ ở đây làm khách tưởng hỏng. */
.alert.alert-info {
  background: color-mix(in srgb, var(--gold, #b07d43) 13%, transparent);
  border-color: color-mix(in srgb, var(--gold, #b07d43) 42%, transparent);
}

/* ---------------- màn hình nhỏ ---------------- */
@media (max-width: 820px) {
  .feat { grid-template-columns: 1fr; padding: 30px 24px; gap: 0; }
  .feat-num { font-size: 46px; margin-bottom: 10px; }
}
@media (max-width: 640px) {
  .top-nav a { display: none; }
  .hero { padding: 58px 0 48px; }
  .section { padding: 52px 0; }
  .sec-title { margin-bottom: 34px; }
  .btn-primary.big { padding: 14px 30px; font-size: 15.5px; width: 100%; }
  .btn-ghost { width: 100%; text-align: center; }
  .save { padding: 24px; gap: 16px; }
  .save-num { font-size: 50px; }
}