/* AcadmyAI website — clean and bright; dark mode follows the device. */
:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --surface: #ffffff;
  --border: #e4e7ef;
  --text: #0f172a;
  --muted: #526077;
  --accent: #4f46e5;
  --accent-ink: #ffffff;
  --accent-soft: #eef0ff;
  --biz: #4f46e5;   --biz-soft: #eef0ff;
  --dev: #0f8f86;   --dev-soft: #e6f6f4;
  --trade: #15803d; --trade-soft: #e8f6ec;
  --learn: #c2410c; --learn-soft: #fdf0e8;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 8px 24px rgba(15, 23, 42, .06);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0f19; --bg-alt: #111727; --surface: #141b2d; --border: #253049;
    --text: #e8ecf5; --muted: #9aa6bd; --accent: #8b85ff; --accent-ink: #0b0f19; --accent-soft: #1e2142;
    --biz: #8b85ff; --biz-soft: #1e2142; --dev: #3cc8bc; --dev-soft: #12302e;
    --trade: #4ade80; --trade-soft: #12301d; --learn: #fb923c; --learn-soft: #33200f;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0f19; --bg-alt: #111727; --surface: #141b2d; --border: #253049;
  --text: #e8ecf5; --muted: #9aa6bd; --accent: #8b85ff; --accent-ink: #0b0f19; --accent-soft: #1e2142;
  --biz: #8b85ff; --biz-soft: #1e2142; --dev: #3cc8bc; --dev-soft: #12302e;
  --trade: #4ade80; --trade-soft: #12301d; --learn: #fb923c; --learn-soft: #33200f;
  --shadow: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font: .85em ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 6px; padding: 1px 5px; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0; letter-spacing: -.01em; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
.center { text-align: center; }
.muted { color: var(--muted); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 50; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border-radius: 10px; padding: 9px 16px; font-weight: 600; font-size: 15px; border: 1px solid transparent; white-space: nowrap; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-outline { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn-outline:hover { border-color: var(--accent); }
.btn-ghost { color: var(--text); }
.btn-lg { padding: 13px 22px; font-size: 16px; }
.btn-small { padding: 7px 12px; font-size: 14px; background: var(--accent-soft); color: var(--accent); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.header-row { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand img { border-radius: 8px; }
.nav { display: flex; gap: 20px; margin-left: 8px; }
.nav a { color: var(--muted); font-weight: 500; }
.nav a:hover { color: var(--text); text-decoration: none; }
.header-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.account-pill { font-size: 14px; color: var(--muted); }

/* Hero */
.hero { padding: 56px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.eyebrow { color: var(--accent); font-weight: 700; font-size: 14px; letter-spacing: .02em; margin: 0 0 12px; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 800; }
.lead { font-size: 18px; color: var(--muted); margin: 18px 0 0; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.facts { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 6px; color: var(--muted); font-size: 15px; }
.facts li::before { content: "✓"; color: var(--trade); font-weight: 700; margin-right: 8px; }
.facts strong { color: var(--text); }
.hero-apps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.tile { display: flex; flex-direction: column; gap: 2px; padding: 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); color: var(--text); box-shadow: var(--shadow); transition: transform .15s; }
.tile:hover { transform: translateY(-2px); text-decoration: none; }
.tile b { font-size: 15px; }
.tile span { font-size: 13px; color: var(--muted); }
.t-biz { border-top: 3px solid var(--biz); }
.t-dev { border-top: 3px solid var(--dev); }
.t-trade { border-top: 3px solid var(--trade); }
.t-learn { border-top: 3px solid var(--learn); }
.t-more { background: var(--accent-soft); border-color: transparent; }
.t-more b { color: var(--accent); }

/* Steps */
.band { background: var(--bg-alt); border-block: 1px solid var(--border); padding: 32px 0; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.steps h3 { font-size: 17px; margin: 10px 0 6px; }
.steps p { margin: 0; color: var(--muted); font-size: 15px; }
.num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 14px; }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--border); }
.section-head { max-width: 720px; margin-bottom: 28px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; }
.section-head p { color: var(--muted); margin: 10px 0 0; font-size: 17px; }
.center .section-head, .section-head.center { margin-inline: auto; }
.note { color: var(--muted); font-size: 14px; margin: 16px 0 0; }

/* Chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.chip { padding: 8px 14px; border-radius: 999px; font-weight: 600; font-size: 14px; }
.chip:hover { text-decoration: none; filter: brightness(.97); }
.c-biz { background: var(--biz-soft); color: var(--biz); }
.c-dev { background: var(--dev-soft); color: var(--dev); }
.c-trade { background: var(--trade-soft); color: var(--trade); }
.c-learn { background: var(--learn-soft); color: var(--learn); }

/* Groups and cards */
.group { padding-top: 40px; }
.group-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.group-head h3 { font-size: 22px; }
.group-head p { margin: 0; color: var(--muted); }
#grow .card { --c: var(--biz); } #build .card { --c: var(--dev); }
#trade .card { --c: var(--trade); } #teach .card { --c: var(--learn); }
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card { display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--c); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.card > header { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.card h4 { font-size: 20px; }
.badge { font-size: 12px; font-weight: 600; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: 2px 8px; }
.one-line { font-size: 16.5px; font-weight: 500; margin: 10px 0 8px; }
.card ul { margin: 0 0 16px; padding-left: 18px; color: var(--muted); font-size: 15px; display: grid; gap: 4px; }
.card > footer { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 14px; border-top: 1px dashed var(--border); }
.plan { font-size: 13.5px; color: var(--text); font-weight: 600; }

/* Packages */
.toggles { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.seg { display: inline-flex; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 3px; }
.seg button { font: inherit; font-size: 14px; font-weight: 600; border: 0; background: transparent; color: var(--muted); padding: 7px 14px; border-radius: 8px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.seg em { font-style: normal; font-weight: 500; font-size: 12px; opacity: .85; margin-left: 4px; }
.packages { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.pkg { position: relative; display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 16px; }
.pkg.popular { border: 2px solid var(--accent); }
.pkg .tag { position: absolute; top: -11px; left: 16px; background: var(--accent); color: var(--accent-ink); font-size: 12px; font-weight: 700; padding: 2px 10px; border-radius: 999px; }
.pkg h3 { font-size: 18px; }
.pkg .price { font-size: 28px; font-weight: 800; margin: 10px 0 0; }
.pkg .per { font-size: 14px; font-weight: 500; color: var(--muted); }
.pkg .sub { font-size: 13px; color: var(--muted); min-height: 20px; }
.pkg .tagline { font-size: 14px; color: var(--muted); margin: 10px 0; }
.pkg .apps-count { font-size: 13px; font-weight: 700; color: var(--accent); }
.pkg ul { list-style: none; padding: 0; margin: 10px 0 16px; display: grid; gap: 6px; font-size: 13.5px; }
.pkg li { display: flex; gap: 6px; }
.pkg li::before { content: "+"; color: var(--accent); font-weight: 800; }
.pkg .inherit { font-size: 13px; color: var(--muted); margin-top: 6px; }
.pkg .btn { margin-top: auto; width: 100%; }

/* Finder */
.finder { margin-top: 48px; display: grid; grid-template-columns: 1fr 1.6fr 1fr; gap: 24px; align-items: start; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.finder h3 { font-size: 20px; }
.finder p { color: var(--muted); margin: 8px 0 0; font-size: 15px; }
.finder-apps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 14px; }
.finder-apps label { display: flex; gap: 8px; align-items: center; font-size: 15px; cursor: pointer; }
.finder-apps input { width: 17px; height: 17px; accent-color: var(--accent); }
.finder-result { background: var(--accent-soft); border-radius: 12px; padding: 16px; font-size: 15px; }
.finder-result strong { font-size: 20px; display: block; }

/* Proof */
.proof { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.stat strong { display: block; font-size: 32px; font-weight: 800; }
.stat span { color: var(--muted); font-size: 15px; }
.stores { margin-top: 40px; }
.stores h3 { font-size: 18px; margin-bottom: 12px; }
.store-links { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.store-links a { border: 1px solid var(--border); border-radius: 10px; padding: 8px 14px; color: var(--text); font-weight: 600; font-size: 14px; background: var(--surface); }
.store-links a::before { content: "▶ "; color: var(--trade); }
.store-links a:hover { border-color: var(--accent); text-decoration: none; }

/* FAQ */
details { border-bottom: 1px solid var(--border); padding: 16px 0; }
summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--accent); font-weight: 700; }
details[open] summary::after { content: "–"; }
details p { color: var(--muted); margin: 10px 0 0; }

/* Final CTA */
.final h2 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; }
.final .lead { margin-bottom: 24px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 48px 0 24px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 24px; }
.footer-grid h4 { font-size: 14px; margin-bottom: 10px; }
.footer-grid > div > a:not(.brand) { display: block; color: var(--muted); padding: 2px 0; }
.copyright { color: var(--muted); margin-top: 32px; font-size: 13px; }

/* Responsive */
@media (max-width: 1080px) {
  .packages { grid-template-columns: repeat(3, 1fr); }
  .finder { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 20px; }
  .proof { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { display: none; }
}
@media (max-width: 560px) {
  .hero { padding-top: 32px; }
  .packages { grid-template-columns: 1fr; }
  .hero-apps { grid-template-columns: repeat(2, 1fr); }
  .finder-apps { grid-template-columns: 1fr 1fr; }
  .header-actions .btn-ghost { display: none; }
  .section { padding: 52px 0; }
}

/* App pages (/rankai …) */
.tone-biz { --c: var(--biz); --c-soft: var(--biz-soft); }
.tone-dev { --c: var(--dev); --c-soft: var(--dev-soft); }
.tone-trade { --c: var(--trade); --c-soft: var(--trade-soft); }
.tone-learn { --c: var(--learn); --c-soft: var(--learn-soft); }
.narrow-wide { max-width: 880px; }
.crumbs { font-size: 14px; color: var(--muted); margin: 0 0 14px; }
.crumbs a { color: var(--muted); }
.app-hero h1 { font-size: clamp(36px, 6vw, 56px); font-weight: 800; color: var(--c); }
.app-headline { font-size: clamp(20px, 2.6vw, 26px); font-weight: 700; margin: 12px 0 0; line-height: 1.3; }
.facts-inline { margin: 22px 0 0; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; font-size: 14px; }
.pill { background: var(--c-soft); color: var(--c); font-weight: 700; padding: 4px 12px; border-radius: 999px; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature { background: var(--surface); border: 1px solid var(--border); border-top: 3px solid var(--c); border-radius: var(--radius); padding: 18px; }
.feature h3 { font-size: 17px; }
.feature p { margin: 8px 0 0; color: var(--muted); font-size: 15px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.two-col h2 { font-size: 24px; font-weight: 800; margin-bottom: 14px; }
.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.ticks li::before { content: "✓"; color: var(--c); font-weight: 800; margin-right: 10px; }
.steps-list { margin: 0; padding-left: 22px; display: grid; gap: 10px; }
.steps-list li::marker { color: var(--c); font-weight: 800; }
.plan-table { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.plan-cell { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.plan-cell.on { border-color: var(--c); }
.plan-cell h3 { font-size: 15px; }
.plan-cell .p-price { color: var(--muted); font-size: 13px; }
.plan-cell .p-value { margin-top: 8px; font-weight: 700; font-size: 15px; }
.plan-cell.off .p-value { color: var(--muted); font-weight: 500; }
.related { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.card h4 a { color: inherit; }
.card .more { font-size: 14px; font-weight: 600; }
@media (max-width: 860px) {
  .features { grid-template-columns: 1fr 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 28px; }
  .plan-table { grid-template-columns: 1fr 1fr; }
  .related { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
}

/* Legal pages */
.legal { padding: 48px 0 72px; }
.legal h1 { font-size: clamp(30px, 4.4vw, 42px); font-weight: 800; }
.legal .meta { color: var(--muted); font-size: 14px; margin: 10px 0 28px; }
.legal h2 { font-size: 22px; font-weight: 800; margin: 40px 0 12px; scroll-margin-top: 80px; }
.legal h3 { font-size: 17px; margin: 22px 0 8px; }
.legal p, .legal li { color: var(--text); font-size: 16px; }
.legal ul, .legal ol { padding-left: 22px; display: grid; gap: 6px; }
.legal .summary { background: var(--accent-soft); border-radius: var(--radius); padding: 18px 20px; }
.legal .summary h2 { margin-top: 0; font-size: 18px; }
.legal .toc { columns: 2; gap: 24px; font-size: 15px; }
.legal table { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 8px 0; }
.legal th, .legal td { text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); padding: 10px 8px; }
.legal th { background: var(--bg-alt); }
.legal .table-wrap { overflow-x: auto; }
@media (max-width: 560px) { .legal .toc { columns: 1; } }

/* Shared AcadmyAI profile menu (vendor/acadmyai-profile-menu.js, same component as every app) */
.profile-menu-slot { display: flex; align-items: center; min-height: 40px; }
[data-acadmy-auth="signed_in"] .signed-out-only { display: none; }
@media (max-width: 560px) { .header-actions .signed-out-only { display: none; } }