/* ---- Reset + tokens --------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "SF Pro Text", Inter, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }

:root {
  --bg:        #0b0e14;
  --bg-alt:    #11151f;
  --bg-card:   #161b27;
  --fg:        #e7ecf3;
  --fg-muted:  #8e96a8;
  --fg-strong: #ffffff;
  --accent:    #5b8cff;
  --accent-2:  #8a5dff;
  --accent-fg: #0b0e14;
  --line:      #232838;
  --warn:      #ff7b54;
  --ok:        #5dd6a5;
  --radius:    14px;
  --container: 1200px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #fbfbfc;
    --bg-alt:    #f1f3f8;
    --bg-card:   #ffffff;
    --fg:        #0e1320;
    --fg-muted:  #5b6478;
    --fg-strong: #02040a;
    --accent:    #2c5cff;
    --accent-2:  #6f3fff;
    --accent-fg: #ffffff;
    --line:      #e3e6ee;
  }
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

/* ---- Layout ----------------------------------------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow { max-width: 760px; }

section { padding: 72px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: none; }

.h1 { font-size: clamp(2rem, 4vw, 3rem); line-height: 1.15; margin: 0 0 16px; color: var(--fg-strong); letter-spacing: -0.02em; }
.h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); line-height: 1.2;  margin: 0 0 16px; color: var(--fg-strong); letter-spacing: -0.01em; }
.h3 { font-size: 1.2rem; line-height: 1.3; margin: 0 0 8px; color: var(--fg-strong); }

.lead { font-size: 1.1rem; color: var(--fg-muted); max-width: 720px; margin: 0 0 36px; }
.muted { color: var(--fg-muted); }
.small { font-size: 0.9rem; }
.accent { color: var(--accent); }

/* ---- Topbar ----------------------------------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg), transparent 12%);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar__inner {
  display: flex; align-items: center; gap: 16px;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--fg-strong); }
.brand__mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.15);
  flex-shrink: 0;
}
.brand__name { font-size: 1.05rem; letter-spacing: -0.01em; }
.brand__sub {
  display: none;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--fg-muted);
  padding-left: 12px;
  margin-left: 4px;
  border-left: 1px solid var(--line);
}
@media (min-width: 900px) {
  .brand__sub { display: inline; }
}
.nav { display: flex; gap: 22px; flex: 1; margin-left: 24px; color: var(--fg-muted); font-size: 0.95rem; }
.nav a:hover { color: var(--fg-strong); }
.topbar__cta { display: flex; gap: 8px; }
@media (max-width: 720px) {
  .nav { display: none; }
}

/* ---- Buttons ---------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 500; font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer; user-select: none;
  transition: transform 0.05s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-fg);
}
.btn--primary:hover { transform: translateY(-1px); color: var(--accent-fg); }
.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--line);
}
.btn--ghost:hover { background: var(--bg-alt); color: var(--fg-strong); border-color: var(--fg-muted); }
.btn--lg { padding: 14px 24px; font-size: 1rem; }
.btn--block { width: 100%; justify-content: center; }

/* ---- Hero ------------------------------------------------------------- */
.hero {
  padding: 96px 0 72px;
  background:
    radial-gradient(800px 400px at 80% -20%, color-mix(in oklab, var(--accent) 25%, transparent), transparent),
    radial-gradient(500px 300px at 0% 30%, color-mix(in oklab, var(--accent-2) 20%, transparent), transparent),
    var(--bg);
  border-top: none;
}
.hero__inner { max-width: 880px; }
.hero__pill {
  display: inline-block;
  padding: 6px 12px; border-radius: 999px;
  background: color-mix(in oklab, var(--accent) 18%, transparent);
  color: var(--accent);
  font-size: 0.85rem; font-weight: 500;
  margin: 0 0 20px;
}
.hero__title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
  color: var(--fg-strong);
}
.hero__subtitle {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 760px;
  margin: 0 0 32px;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 24px; }
.hero__meta { color: var(--fg-muted); font-size: 0.9rem; }

/* ---- Grids + cards ---------------------------------------------------- */
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

.card, .module, .tariff, .auth__card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.card p, .module p, .tariff__list { color: var(--fg-muted); margin: 0; }

/* ---- Audience -------------------------------------------------------- */
.audience__fit {
  margin: 32px 0 0; padding: 16px 20px;
  background: var(--bg-alt); border-radius: 10px;
  color: var(--fg-muted);
}

/* ---- Problem-list ---------------------------------------------------- */
.problem {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.problem--after {
  border-color: color-mix(in oklab, var(--accent) 60%, var(--line));
  background: linear-gradient(180deg, color-mix(in oklab, var(--accent) 6%, var(--bg-card)), var(--bg-card));
}
.problem__from { font-weight: 700; color: var(--fg-strong); margin: 0 0 16px; font-size: 1.1rem; }
.problem__from--before { color: var(--fg-muted); }
.problem__from--after { color: var(--accent); }
.problem__list { list-style: none; padding: 0; margin: 0; }
.problem__list li {
  padding: 10px 0 10px 28px;
  border-top: 1px solid var(--line);
  position: relative;
  color: var(--fg);
}
.problem__list li:first-child { border-top: none; }
.problem__list li::before {
  content: "—"; position: absolute; left: 0; top: 10px;
  color: var(--warn);
}
.problem--after .problem__list li::before { content: "✓"; color: var(--ok); }

/* ---- Modules --------------------------------------------------------- */
.module__num {
  display: inline-block;
  padding: 4px 10px; border-radius: 8px;
  background: color-mix(in oklab, var(--accent) 16%, transparent);
  color: var(--accent);
  font-weight: 700; font-size: 0.85rem;
  margin: 0 0 12px;
}

/* ---- Tariffs --------------------------------------------------------- */
.tariff { display: flex; flex-direction: column; position: relative; }
.tariff--featured {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 12px 30px -10px color-mix(in oklab, var(--accent) 50%, transparent);
}
.tariff__badge {
  position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
  padding: 4px 10px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-fg); font-size: 0.75rem; font-weight: 600;
}
.tariff__name { margin: 0 0 4px; color: var(--fg-strong); }
.tariff__price { font-size: 1.4rem; margin: 0 0 16px; color: var(--fg-strong); }
.tariff__price b { font-size: 2rem; font-weight: 700; }
.tariff__list { list-style: none; padding: 0; margin: 0; flex: 1; }
.tariff__list li {
  padding: 8px 0 8px 22px; position: relative;
  border-top: 1px solid var(--line);
  color: var(--fg);
}
.tariff__list li:first-child { border-top: none; }
.tariff__list li::before {
  content: "✓"; position: absolute; left: 0; top: 8px;
  color: var(--accent);
}

/* ---- Steps ----------------------------------------------------------- */
.steps { list-style: none; padding: 0; margin: 0 0 32px; display: grid; gap: 12px; }
.steps li {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px 20px;
}
.steps li p { margin: 0; }
.step__num {
  flex-shrink: 0;
  width: 32px; height: 32px; border-radius: 50%;
  background: color-mix(in oklab, var(--accent) 16%, transparent);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem;
}

/* ---- Article (install/login) ---------------------------------------- */
.article { padding: 48px 0 96px; }
.article p { color: var(--fg-muted); }
.article ul, .article ol { color: var(--fg-muted); padding-left: 22px; line-height: 1.7; }
.article li b { color: var(--fg); }
.article hr { border: none; height: 1px; background: var(--line); margin: 36px 0; }
.article details {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 8px 0;
  background: var(--bg-card);
}
.article details[open] { border-color: var(--accent); }
.article summary { cursor: pointer; font-weight: 500; color: var(--fg-strong); }
.article details p { margin: 12px 0 0; }
.article code {
  background: var(--bg-alt);
  padding: 1px 6px; border-radius: 4px;
  font-family: SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em; color: var(--fg);
}

.cta-block { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 0; }

/* ---- Auth ------------------------------------------------------------ */
.auth { padding: 80px 0; min-height: calc(100vh - 64px); display: flex; align-items: center; }
.auth__card { padding: 32px; }
.auth__entry { margin: 24px 0; }
.auth__entry-btn { width: 100%; justify-content: center; }
.auth__divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--fg-muted); font-size: 0.9rem;
  margin: 24px 0;
}
.auth__divider::before, .auth__divider::after {
  content: ""; flex: 1; height: 1px; background: var(--line);
}
.auth__form label { display: block; margin: 0 0 14px; }
.auth__form span { display: block; margin: 0 0 6px; font-size: 0.9rem; color: var(--fg-muted); }
.auth__form input {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--fg);
  font: inherit;
  transition: border-color 0.15s ease;
}
.auth__form input:focus { outline: none; border-color: var(--accent); }
.auth__msg {
  margin: 16px 0 0;
  padding: 12px 14px;
  background: color-mix(in oklab, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 40%, var(--line));
  border-radius: 10px;
  color: var(--fg);
  font-size: 0.92rem;
}
.auth__back { text-align: center; margin: 24px 0 0; }

/* ---- Footer ---------------------------------------------------------- */
.footer { padding: 32px 0; border-top: 1px solid var(--line); }
.footer__inner { display: flex; justify-content: space-between; gap: 24px; align-items: center; flex-wrap: wrap; color: var(--fg-muted); }
.footer__legal { font-size: 0.85rem; margin: 4px 0 0; }
.footer__nav { display: flex; gap: 22px; font-size: 0.95rem; }