/* Trust1 Partner Program — Founding Agency (WaSend + TrustShop). Không framework. */
:root {
  --ink: #0f1f18;
  --ink-soft: #4a5c53;
  --muted: #6b7b73;
  --line: #dce7e0;
  --bg: #ffffff;
  --tint: #f5f8f4;
  --dark: #0d2b21;
  --dark-2: #12382b;
  --wa: #18754b;          /* WaSend primary */
  --wa-bright: #25d366;   /* WhatsApp green */
  --ts: #b7791f;          /* TrustShop — sao đánh giá */
  --ts-bright: #e7ae15;   /* màu logo TrustShop */
  --ok: #18754b;
  --no: #b42318;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 31, 24, .06), 0 8px 24px rgba(15, 31, 24, .06);
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --display: 'Be Vietnam Pro', var(--font);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; font: 16px/1.6 var(--font); color: var(--ink); background: var(--bg); -webkit-font-smoothing: antialiased; }
h1, h2, h3 { font-family: var(--display); line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); font-weight: 800; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--wa); }
img { max-width: 100%; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.wrap--narrow { max-width: 820px; }
.section { padding: 88px 0; }
.section--tint { background: var(--tint); }
.section--dark { background: radial-gradient(1200px 600px at 10% 0%, #155b3f 0%, var(--dark) 55%); color: #e6f2ec; }
.section__lead { color: var(--ink-soft); max-width: 640px; font-size: 1.08rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--wa); margin-bottom: .8em; }
.eyebrow--light { color: var(--wa-bright); }

/* Buttons & links */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 22px; border-radius: 999px; font: 600 1rem var(--font); text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s; }
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible, .link:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 3px solid rgba(37, 211, 102, .45); outline-offset: 2px; }
.btn--primary { background: var(--wa-bright); color: #062b1a; box-shadow: 0 6px 18px rgba(37, 211, 102, .35); }
.btn--primary:hover { background: #2ee070; }
.btn--ghost { border-color: rgba(255, 255, 255, .35); color: #fff; }
.btn--sm { padding: 9px 16px; font-size: .9rem; }
.btn--block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }
.link { background: none; border: 0; padding: 0; color: var(--wa); font: inherit; font-weight: 600; text-decoration: underline; cursor: pointer; }
.link--light { color: var(--wa-bright); }

/* Top bar */
.topbar { position: sticky; top: 0; z-index: 20; background: rgba(13, 43, 33, .92); backdrop-filter: blur(10px); color: #fff; }
.topbar__inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 600; }
/* Logo: icon app vuông → ô bo góc nền trắng (logo WaSend có nền trắng đặc, Trust1 màu navy). */
.logo { display: inline-block; flex: none; border-radius: 22%; background: #fff; object-fit: contain; vertical-align: middle; }
.logo--brand { width: 34px; height: 34px; padding: 3px; border-radius: 10px; }
.brand__text b { color: var(--wa-bright); font-weight: 700; }
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { color: #cfe3d9; text-decoration: none; font-size: .95rem; }
.nav a:hover { color: #fff; }
.topbar__actions { display: flex; align-items: center; gap: 12px; }
.lang { display: flex; border: 1px solid rgba(255, 255, 255, .25); border-radius: 999px; overflow: hidden; }
.lang button { background: none; border: 0; color: #cfe3d9; font: 600 .78rem var(--font); padding: 6px 10px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: rgba(255, 255, 255, .16); color: #fff; }

/* Hero */
.hero { background: radial-gradient(900px 500px at 85% 10%, rgba(245, 179, 1, .18), transparent 60%), radial-gradient(1100px 700px at 0% 0%, #176a47 0%, var(--dark) 60%); color: #fff; padding: 88px 0 96px; }
.hero__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.hero .eyebrow { color: var(--wa-bright); }
.hero__lead { font-size: 1.15rem; color: #cfe3d9; max-width: 560px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 32px; }
.hero__facts { display: flex; flex-wrap: wrap; gap: 28px; list-style: none; padding: 0; margin: 0; }
.hero__facts li { display: flex; flex-direction: column; color: #b9d3c5; font-size: .9rem; }
.hero__facts strong { font: 800 1.9rem var(--display); color: #fff; }
.hero__card { display: grid; gap: 14px; }
.mini { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; padding: 22px 24px; border-radius: 18px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12); }
.mini__logo { display: flex; align-items: center; gap: 10px; font: 800 1.35rem var(--display); }
.mini__logo .logo { width: 36px; height: 36px; }
.mini--wa .mini__logo b { color: var(--wa-bright); }
.mini--ts .mini__logo b { color: var(--ts-bright); }
.mini__tag { grid-column: 1; color: #b9d3c5; font-size: .9rem; }
.mini__rate { grid-row: 1 / span 2; grid-column: 2; align-self: center; font: 700 1.5rem var(--display); }
.mini--wa .mini__rate b { color: var(--wa-bright); }
.mini--ts .mini__rate b { color: var(--ts-bright); }
.mini__dur { grid-column: 1 / -1; font-size: .82rem; color: #fff; opacity: .8; }
.hero__note { font-size: .82rem; color: #9fbcae; margin: 4px 0 0; }

/* Program cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-top: 32px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; background: #fff; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: 0 0 auto; height: 5px; background: var(--accent); }
.card--wa { --accent: linear-gradient(90deg, var(--wa-bright), #007f5f); }
.card--ts { --accent: linear-gradient(90deg, var(--ts-bright), var(--ts)); }
.card__head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.card__app { display: flex; align-items: center; gap: 12px; font: 800 1.4rem var(--display); }
.card__app .logo { width: 40px; height: 40px; box-shadow: 0 0 0 1px var(--line); }
.card__sub { color: var(--muted); font-size: .9rem; }
.card__rates { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 20px 0; }
.rate { background: var(--tint); border-radius: 12px; padding: 14px 16px; }
.rate b { display: block; font: 800 2rem var(--display); color: var(--rate-color, var(--wa)); }
.card--ts .rate b { --rate-color: var(--ts); }
.rate span { font-size: .85rem; color: var(--ink-soft); }
.card__list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; font-size: .95rem; }
.card__list li { display: flex; gap: 10px; }
.card__list li::before { content: "✓"; color: var(--wa); font-weight: 700; }
.card__upcoming { margin-top: 16px; padding: 10px 14px; border-radius: 10px; background: #fff8e1; color: #6b4d00; font-size: .88rem; }
.shared { margin-top: 28px; padding: 22px 26px; border-radius: var(--radius); background: var(--tint); }
.shared h3 { margin-bottom: 10px; }
.shared__list { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px 24px; list-style: none; padding: 0; margin: 0; font-size: .95rem; }
.shared__list b { display: block; font-size: 1.05rem; }
.shared__list span { color: var(--ink-soft); font-size: .88rem; }

/* Why */
.why { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 28px; }
.why__item { background: #fff; border-radius: var(--radius); padding: 28px; border: 1px solid var(--line); }
.why__item h3 { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.why__item h3 .logo { width: 32px; height: 32px; box-shadow: 0 0 0 1px var(--line); }
.why__item h3 span { color: var(--muted); font-weight: 500; }
.why__item ul { padding-left: 18px; margin: 0 0 14px; display: grid; gap: 6px; }
.why__item--wa li::marker { color: var(--wa-bright); }
.why__item--ts li::marker { color: var(--ts-bright); }
.why__plans { font-size: .85rem; color: var(--muted); margin: 0; border-top: 1px dashed var(--line); padding-top: 12px; }

/* Calculator */
.calc { display: grid; grid-template-columns: 380px 1fr; gap: 24px; margin-top: 32px; }
.calc__inputs { display: grid; gap: 16px; align-content: start; }
.calc__app { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px 6px; margin: 0; }
.calc__app[data-app="wasend"] { border-top: 4px solid var(--wa-bright); }
.calc__app[data-app="trustshop"] { border-top: 4px solid var(--ts-bright); }
.calc__app.is-off .field { opacity: .45; pointer-events: none; }
.calc__app legend { padding: 0 6px; }
.calc__global { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.switch { display: inline-flex; align-items: center; gap: 8px; font: 700 1.05rem var(--display); cursor: pointer; }
.switch input { width: 18px; height: 18px; accent-color: var(--wa); }
.switch .logo { width: 22px; height: 22px; box-shadow: 0 0 0 1px var(--line); }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; border: 0; padding: 0; min-width: 0; }
.field > span, .field > legend { font-size: .85rem; font-weight: 600; color: var(--ink-soft); padding: 0; }
.field input:not([type="checkbox"]):not([type="range"]), .field select, .field textarea { width: 100%; padding: 11px 12px; border: 1px solid #c9d6ce; border-radius: 10px; font: 400 1rem var(--font); color: var(--ink); background: #fff; }
.field textarea { resize: vertical; }
.range { display: flex; align-items: center; gap: 12px; }
.range input { flex: 1; accent-color: var(--wa); }
.range output { min-width: 2ch; font-weight: 700; text-align: right; }
.calc__out { border-radius: var(--radius); background: var(--dark); color: #e6f2ec; padding: 26px; display: flex; flex-direction: column; gap: 16px; }
.kpis { display: grid; grid-template-columns: 1fr 1fr 1.3fr; gap: 12px; }
.kpi { background: rgba(255, 255, 255, .06); border-radius: 12px; padding: 14px 16px; }
.kpi span { font-size: .8rem; color: #9fbcae; }
.kpi b { display: block; font: 800 1.5rem var(--display); color: #fff; }
.kpi--big b { font-size: 2rem; color: var(--wa-bright); }
.chart { height: 240px; display: flex; align-items: flex-end; gap: 3px; padding-top: 8px; border-bottom: 1px solid rgba(255, 255, 255, .15); }
.chart__bar { flex: 1; display: flex; flex-direction: column-reverse; min-width: 3px; height: 100%; justify-content: flex-start; position: relative; }
.chart__seg { width: 100%; border-radius: 3px 3px 0 0; }
.chart__seg--wa { background: var(--wa-bright); }
.chart__seg--ts { background: var(--ts-bright); }
.chart__bar:hover::after { content: attr(data-tip); position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%); background: #fff; color: var(--ink); font-size: .75rem; padding: 4px 8px; border-radius: 6px; white-space: nowrap; z-index: 2; }
.legend { display: flex; gap: 16px; align-items: center; font-size: .85rem; color: #b9d3c5; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: -10px; }
.dot--wa { background: var(--wa-bright); }
.dot--ts { background: var(--ts-bright); }
.calc__note { font-size: .8rem; color: #9fbcae; margin: 0; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 32px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.steps li { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.steps b { font: 800 .9rem var(--display); color: var(--wa); }
.steps h3 { margin: 6px 0 8px; }
.steps p { color: var(--ink-soft); font-size: .95rem; margin: 0; }

/* Rules */
.rules { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 28px; }
.rules__col { border-radius: var(--radius); padding: 24px 26px; border: 1px solid var(--line); }
.rules__col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.rules__col li { display: flex; gap: 10px; }
.rules__col--ok li::before { content: "✓"; color: var(--ok); font-weight: 800; }
.rules__col--no li::before { content: "✕"; color: var(--no); font-weight: 800; }
.rules__col--ok { background: #f2faf5; }
.rules__col--no { background: #fdf4f3; }
.rules__more { margin-top: 18px; }

/* Apply */
.apply { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: start; }
.apply__intro p { color: #b9d3c5; font-size: 1.05rem; }
.apply__points { list-style: none; padding: 0; display: grid; gap: 10px; }
.apply__points li { display: flex; gap: 10px; }
.apply__points li::before { content: "✓"; color: var(--wa-bright); font-weight: 800; }
.form, .success { background: #fff; color: var(--ink); border-radius: 18px; padding: 28px; box-shadow: 0 20px 60px rgba(0, 0, 0, .3); }
.form__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { position: relative; cursor: pointer; }
.chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.chip span { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 999px; border: 1px solid #c9d6ce; font-size: .9rem; font-weight: 500; transition: all .15s; }
.chip input:checked + span { background: var(--dark); border-color: var(--dark); color: #fff; }
.chip .logo { width: 20px; height: 20px; }
.chip input:focus-visible + span { outline: 3px solid rgba(37, 211, 102, .45); outline-offset: 2px; }
/* Chọn chương trình: checkbox thường, mỗi app một dòng. */
.options { display: flex; flex-direction: column; gap: 8px; margin: 2px 0 4px; }
.option { display: flex; align-items: center; gap: 10px; cursor: pointer; font-weight: 500; }
.option input { width: 18px; height: 18px; margin: 0; accent-color: var(--wa); flex: none; }
.option .logo { width: 20px; height: 20px; box-shadow: 0 0 0 1px var(--line); }
.option small { color: var(--muted); font-weight: 400; font-size: .85rem; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: .92rem; margin: 6px 0 4px; }
.check input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--wa); flex: none; }
.check .link--light { color: var(--wa); }
.err { display: block; color: var(--no); font-style: normal; font-size: .82rem; min-height: 0; }
.err:empty { display: none; }
.field.has-error input:not([type="checkbox"]), .field.has-error select { border-color: var(--no); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
#apply-submit { margin-top: 16px; }
.form__status { font-size: .9rem; margin: 12px 0 0; min-height: 1.2em; }
.form__status.is-error { color: var(--no); }
.success { text-align: center; padding: 48px 32px; }
.success__icon { width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center; margin: 0 auto 16px; background: #e7f8ee; color: var(--wa); font-size: 2rem; font-weight: 800; }

/* FAQ */
.faq { display: grid; gap: 10px; margin-top: 24px; }
.faq details { border: 1px solid var(--line); border-radius: 12px; padding: 0 20px; background: #fff; }
.faq summary { cursor: pointer; padding: 18px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--wa); font-size: 1.3rem; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--ink-soft); margin: 0 0 18px; }

/* Footer */
.footer { background: var(--dark); color: #9fbcae; font-size: .88rem; padding: 28px 0; }
.footer__inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer__brand { display: inline-flex; align-items: center; gap: 10px; }
.footer__brand .logo { width: 24px; height: 24px; padding: 2px; border-radius: 7px; }
.footer__links { display: flex; gap: 18px; }
.footer a { color: #cfe3d9; }

/* Terms dialog */
.dialog { width: min(860px, calc(100vw - 32px)); max-height: calc(100vh - 48px); border: 0; border-radius: 18px; padding: 0; box-shadow: 0 30px 80px rgba(0, 0, 0, .35); }
.dialog::backdrop { background: rgba(5, 20, 14, .55); }
.dialog__head { display: flex; justify-content: space-between; align-items: center; padding: 18px 24px; border-bottom: 1px solid var(--line); margin: 0; }
.dialog__head h3 { margin: 0; }
.dialog__close { background: none; border: 0; font-size: 1.2rem; cursor: pointer; color: var(--muted); }
.dialog__tabs { display: flex; gap: 8px; padding: 12px 24px 0; }
.dialog__tabs button { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 14px; font: 600 .88rem var(--font); cursor: pointer; }
.dialog__tabs .logo { width: 18px; height: 18px; }
.dialog__tabs button[aria-selected="true"] { background: var(--dark); color: #fff; border-color: var(--dark); }
.dialog__body { padding: 16px 24px 24px; overflow: auto; max-height: calc(100vh - 200px); }
.dialog__body pre { white-space: pre-wrap; font: .92rem/1.65 var(--font); margin: 0; }
.dialog__meta { font-size: .85rem; color: var(--muted); margin-bottom: 12px; }

/* Chế độ trang: invited (có link mời hợp lệ) · public (người truy cập thường) · loading. */
html[data-mode="public"] .invited-only,
html[data-mode="invited"] .public-only,
html[data-mode="loading"] .invited-only,
html[data-mode="loading"] .public-only,
html:not([data-mode="loading"]) .loading-only { display: none !important; }
.hero__loading { color: #b9d3c5; font-size: 1.1rem; grid-column: 1 / -1; padding: 80px 0; text-align: center; }
.greeting { font: 700 1.25rem var(--display); color: #fff; margin-bottom: 18px; display: inline-flex; align-items: center; gap: 10px; padding: 8px 16px 8px 10px; border-radius: 999px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .14); }
.greeting:empty { display: none; }
.greeting__badge { font: 700 .72rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: #062b1a; background: var(--wa-bright); border-radius: 999px; padding: 3px 9px; }
.hero__notice { background: rgba(245, 179, 1, .12); border: 1px solid rgba(245, 179, 1, .35); color: #ffe9a8; border-radius: 12px; padding: 12px 14px; font-size: .92rem; max-width: 560px; }
.mini:not(:has(.mini__rate)) { grid-template-columns: 1fr; }

/* Responsive */
@media (max-width: 960px) {
  .hero__grid, .apply, .calc, .why, .rules { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .nav { display: none; }
  .topbar__actions { margin-left: auto; }
}
@media (max-width: 600px) {
  .section { padding: 64px 0; }
  .hero { padding: 56px 0 64px; }
  .steps, .form__grid, .calc__global, .kpis { grid-template-columns: 1fr; }
  .wrap { padding: 0 16px; }
  .form, .success { padding: 22px 18px; }
  .brand__text { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}