/* ============================================================
   dv01stack — shared design system
   Dark default, light via [data-theme="light"]
   ============================================================ */

:root {
  /* brand accents (shared across themes) */
  --accent: #14b8a6;       /* teal */
  --accent-2: #6366f1;     /* indigo */
  --accent-grad: linear-gradient(120deg, #2dd4bf, #818cf8);

  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1080px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "Paper Mono", ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---- Dark theme (default) ---- */
:root, :root[data-theme="dark"] {
  --bg: #0a0e1a;
  --bg-2: #0e1424;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-2: rgba(255, 255, 255, 0.05);
  --fg: #e6edf6;
  --muted: #8a96ab;
  --muted-2: #5d6880;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --shadow: 0 18px 40px -20px rgba(0, 0, 0, 0.7);
  --glow-1: rgba(20, 184, 166, 0.22);
  --glow-2: rgba(99, 102, 241, 0.18);
  color-scheme: dark;
}

/* ---- Light theme ---- */
:root[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-2: #ffffff;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --fg: #0f172a;
  --muted: #51607a;
  --muted-2: #8a97ad;
  --line: rgba(15, 23, 42, 0.10);
  --line-strong: rgba(15, 23, 42, 0.18);
  --shadow: 0 18px 40px -24px rgba(15, 23, 42, 0.25);
  --glow-1: rgba(20, 184, 166, 0.14);
  --glow-2: rgba(99, 102, 241, 0.12);
  color-scheme: light;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

/* subtle backdrop glows */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(620px 420px at 78% -8%, var(--glow-1), transparent 70%),
    radial-gradient(560px 420px at 8% 108%, var(--glow-2), transparent 70%);
  pointer-events: none;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
main { flex: 1; }
.section { padding: clamp(48px, 8vw, 96px) 0; }
.section-tight { padding: clamp(32px, 5vw, 56px) 0; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 650; letter-spacing: -0.01em; font-size: 1.06rem; }
.brand .logo {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: 9px; background: var(--surface);
}
.brand .logo svg { width: 19px; height: 19px; }
.brand b { color: var(--accent); font-weight: 650; }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 8px 14px; border-radius: 9px; color: var(--muted);
  font-size: 0.94rem; font-weight: 500; transition: color 0.15s, background 0.15s;
}
.nav-links a:hover { color: var(--fg); background: var(--surface-2); }
.nav-links a.active { color: var(--fg); background: var(--surface-2); }

.nav-right { display: flex; align-items: center; gap: 8px; }

.theme-toggle, .nav-burger {
  width: 38px; height: 38px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 9px; background: var(--surface);
  color: var(--fg); cursor: pointer; transition: background 0.15s, border-color 0.15s;
}
.theme-toggle:hover, .nav-burger:hover { background: var(--surface-2); border-color: var(--line-strong); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
.nav-burger { display: none; }
.nav-burger svg { width: 20px; height: 20px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 11px; font-weight: 600; font-size: 0.95rem;
  cursor: pointer; border: 1px solid transparent; transition: transform 0.12s, filter 0.15s, background 0.15s, border-color 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent-grad); color: #06121a; }
.btn-primary:hover { filter: brightness(1.06); }
.btn-ghost { background: var(--surface); border-color: var(--line-strong); color: var(--fg); }
.btn-ghost:hover { background: var(--surface-2); }

/* ---------- pills / tags ---------- */
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.78rem; color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 5px 13px; background: var(--surface);
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.tag {
  display: inline-block; font-size: 0.72rem; font-weight: 600; letter-spacing: 0.03em;
  text-transform: uppercase; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border-radius: 6px; padding: 3px 9px;
}
.tag.alt { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 14%, transparent); }

/* ---------- hero ---------- */
.hero { padding: clamp(56px, 10vw, 120px) 0 clamp(40px, 7vw, 80px); }
.hero h1 {
  font-size: clamp(2.4rem, 6.5vw, 4.4rem); line-height: 1.03; letter-spacing: -0.03em;
  font-weight: 720; margin: 22px 0 20px; max-width: 16ch;
}
.hero h1 .accent { background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .lede { font-size: clamp(1.05rem, 2.2vw, 1.28rem); color: var(--muted); max-width: 56ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

/* ---------- page header (interior pages) ---------- */
.page-head { padding: clamp(40px, 7vw, 72px) 0 clamp(20px, 3vw, 32px); border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: clamp(2rem, 5vw, 3.1rem); letter-spacing: -0.025em; line-height: 1.08; font-weight: 700; margin: 16px 0 14px; }
.page-head p { color: var(--muted); max-width: 60ch; font-size: 1.05rem; }
.eyebrow { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }

/* ---------- cards / grids ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: border-color 0.18s, transform 0.18s, background 0.18s;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.card h3 { font-size: 1.18rem; letter-spacing: -0.01em; margin: 12px 0 8px; line-height: 1.3; }
.card p { color: var(--muted); font-size: 0.96rem; }
.card .card-meta { display: flex; align-items: center; gap: 10px; font-size: 0.82rem; color: var(--muted-2); margin-top: 14px; }
.card .icon-box {
  width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent);
  border: 1px solid var(--line);
}
.card .icon-box svg { width: 21px; height: 21px; }

/* research list rows */
.research-list { display: flex; flex-direction: column; gap: 0; }
.research-item {
  display: flex; gap: 20px; align-items: baseline; justify-content: space-between;
  padding: 22px 4px; border-bottom: 1px solid var(--line); transition: padding-left 0.18s;
}
.research-item:hover { padding-left: 12px; }
.research-item .ri-main { min-width: 0; }
.research-item h3 { font-size: 1.16rem; letter-spacing: -0.01em; margin: 8px 0 6px; }
.research-item p { color: var(--muted); font-size: 0.95rem; }
.research-item .ri-date { color: var(--muted-2); font-size: 0.85rem; white-space: nowrap; font-family: var(--mono); }

/* ---------- newsletter ---------- */
.subscribe-card {
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: clamp(24px, 4vw, 40px); box-shadow: var(--shadow);
}
.subscribe-form { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.subscribe-form input[type="email"] {
  flex: 1; min-width: 220px; padding: 13px 16px; font-size: 1rem; font-family: var(--font);
  color: var(--fg); background: var(--bg-2); border: 1px solid var(--line-strong); border-radius: 11px;
  transition: border-color 0.15s;
}
.subscribe-form input[type="email"]:focus { outline: none; border-color: var(--accent); }
.subscribe-form input::placeholder { color: var(--muted-2); }
.form-note { font-size: 0.84rem; color: var(--muted-2); margin-top: 12px; }
.form-status { margin-top: 14px; font-size: 0.92rem; min-height: 1.2em; }
.form-status.ok { color: var(--accent); }
.form-status.err { color: #f87171; }

.issue-item {
  display: flex; gap: 18px; align-items: baseline; justify-content: space-between;
  padding: 18px 4px; border-bottom: 1px solid var(--line);
}
.issue-item h3 { font-size: 1.05rem; font-weight: 600; letter-spacing: -0.01em; }
.issue-item .issue-date { font-family: var(--mono); font-size: 0.82rem; color: var(--muted-2); white-space: nowrap; }

/* ---------- about ---------- */
.prose { max-width: 68ch; }
.prose p { color: var(--muted); margin: 0 0 18px; font-size: 1.06rem; }
.prose h2 { font-size: 1.5rem; letter-spacing: -0.02em; margin: 36px 0 14px; color: var(--fg); }
.prose strong { color: var(--fg); }
.prose a { color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 50%, transparent); }

.stat-row { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 8px; }
.stat .num { font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .lbl { color: var(--muted); font-size: 0.9rem; }

/* ---------- placeholder marker ---------- */
.ph { border-left: 2px dashed var(--accent-2); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 30px 0; margin-top: 40px; }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-row .muted { color: var(--muted-2); font-size: 0.85rem; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--muted); font-size: 0.88rem; }
.footer-links a:hover { color: var(--fg); }

/* ---------- mobile ---------- */
@media (max-width: 760px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav-burger { display: grid; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--bg-2); border-bottom: 1px solid var(--line);
    padding: 10px 16px 16px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .research-item { flex-direction: column; gap: 6px; }
  .research-item .ri-date { order: -1; }
}

/* ---------- Substack button ---------- */
.btn-substack { background: #FF6719; color: #fff; }
.btn-substack:hover { filter: brightness(1.05); }
.btn-substack svg { width: 17px; height: 17px; }

/* "or" divider */
.or-divider { display: flex; align-items: center; gap: 14px; margin: 20px 0 6px; color: var(--muted-2); font-size: 0.82rem; }
.or-divider::before, .or-divider::after { content: ""; height: 1px; flex: 1; background: var(--line); }

/* ---------- free / paid research ---------- */
.section-label { display: flex; align-items: center; gap: 12px; margin: 8px 0 6px; }
.section-label h2 { font-size: 1.3rem; letter-spacing: -0.02em; }
.badge-free { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--accent); background: color-mix(in srgb, var(--accent) 15%, transparent); border-radius: 6px; padding: 3px 9px; }
.badge-members { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: #FF8a4c; background: rgba(255,103,25,0.14); border-radius: 6px; padding: 3px 9px; display: inline-flex; align-items: center; gap: 5px; }
.badge-members svg { width: 12px; height: 12px; }

.research-item.locked .ri-main h3 { color: var(--muted); }
.research-item.locked { opacity: 0.92; }
.lock-cta { font-size: 0.84rem; font-weight: 600; color: #FF8a4c; white-space: nowrap; display: inline-flex; align-items: center; gap: 6px; }
.lock-cta svg { width: 13px; height: 13px; }

/* members banner */
.members-banner {
  margin-top: 30px; border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: linear-gradient(120deg, color-mix(in srgb, #FF6719 10%, var(--surface)), var(--surface));
  padding: clamp(22px, 3.5vw, 34px);
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.members-banner h3 { font-size: 1.25rem; letter-spacing: -0.01em; margin-bottom: 4px; }
.members-banner p { color: var(--muted); font-size: 0.95rem; max-width: 52ch; }

/* ---------- pricing ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; align-items: stretch; margin-top: 30px; }
.price-card {
  display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 22px; position: relative;
}
.price-card.featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.price-badge {
  position: absolute; top: -11px; left: 22px; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: #06121a; background: var(--accent-grad); border-radius: 6px; padding: 4px 10px;
}
.price-name { font-size: 1.15rem; font-weight: 650; letter-spacing: -0.01em; }
.price-tagline { color: var(--muted); font-size: 0.88rem; margin-top: 4px; min-height: 2.4em; }
.price-amount { margin: 16px 0 6px; display: flex; align-items: baseline; gap: 4px; }
.price-amount .amt { font-size: 2.2rem; font-weight: 720; letter-spacing: -0.03em; }
.price-amount .per { color: var(--muted-2); font-size: 0.9rem; }
.perk-list { list-style: none; margin: 16px 0 22px; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.perk-list li { color: var(--muted); font-size: 0.9rem; display: flex; gap: 9px; align-items: flex-start; line-height: 1.4; }
.perk-list li svg { width: 15px; height: 15px; color: var(--accent); flex: none; margin-top: 2px; }
.price-card .price-cta { margin-top: auto; }
.price-card .price-cta .btn { width: 100%; }
.notice { padding: 12px 16px; border-radius: 11px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--muted); font-size: 0.92rem; margin-bottom: 20px; }

.billing-toggle { display: inline-flex; gap: 4px; padding: 4px; border: 1px solid var(--line-strong); border-radius: 12px; background: var(--surface); margin-bottom: 4px; }
.bt-opt { border: none; background: transparent; color: var(--muted); font: inherit; font-weight: 600; font-size: 0.92rem; padding: 8px 16px; border-radius: 9px; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; transition: background 0.15s, color 0.15s; }
.bt-opt.active { background: var(--accent-grad); color: #06121a; }
.bt-save { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent); border-radius: 5px; padding: 2px 6px; }
.bt-opt.active .bt-save { background: rgba(6,18,26,0.18); color: #06121a; }
.price-subnote { font-size: 0.8rem; color: var(--accent); min-height: 1.1em; margin: -2px 0 4px; }

@media (max-width: 900px) { .pricing-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .pricing-grid { grid-template-columns: 1fr; } }

/* ---------- gated states / hub / jobs ---------- */
.gate {
  max-width: 540px; margin: 10px auto; text-align: center;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--surface); padding: clamp(28px, 5vw, 48px); box-shadow: var(--shadow);
}
.gate .lock-icon { width: 46px; height: 46px; margin: 0 auto 16px; display: grid; place-items: center; border-radius: 12px; background: color-mix(in srgb, var(--accent-2) 14%, transparent); color: var(--accent-2); }
.gate .lock-icon svg { width: 24px; height: 24px; }
.gate h2 { font-size: 1.5rem; letter-spacing: -0.02em; margin-bottom: 8px; }
.gate p { color: var(--muted); margin-bottom: 20px; }
.gate .gate-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.hub-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 22px; }
.hub-link { display: flex; flex-direction: column; gap: 8px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; transition: border-color 0.18s, transform 0.18s; }
.hub-link:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.hub-link h3 { font-size: 1.1rem; letter-spacing: -0.01em; }
.hub-link p { color: var(--muted); font-size: 0.92rem; }
.hub-link .go { margin-top: auto; color: var(--accent); font-weight: 600; font-size: 0.9rem; }

.jobs-list { display: flex; flex-direction: column; gap: 14px; margin-top: 20px; }
.job-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.job-card .job-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.job-card h3 { font-size: 1.12rem; letter-spacing: -0.01em; }
.job-card .job-co { color: var(--accent); font-weight: 600; font-size: 0.95rem; }
.job-card .job-meta { color: var(--muted-2); font-size: 0.84rem; display: flex; gap: 14px; flex-wrap: wrap; margin-top: 4px; }
.job-card .job-desc { color: var(--muted); font-size: 0.93rem; margin-top: 12px; white-space: pre-wrap; }
.job-card .job-apply { margin-top: 14px; }

.field { display: block; margin-bottom: 14px; }
.field label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 6px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px; font-size: 0.98rem; font-family: var(--font);
  color: var(--fg); background: var(--bg-2); border: 1px solid var(--line-strong); border-radius: 10px;
}
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--accent); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px){ .field-row { grid-template-columns: 1fr; } }

/* ---------- reviews ---------- */
.reviews-list { display: flex; flex-direction: column; gap: 14px; margin-top: 20px; }
.review-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.review-card .rv-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.review-card .rv-co { font-size: 1.12rem; font-weight: 650; letter-spacing: -0.01em; }
.review-card .rv-salary { color: var(--accent); font-weight: 700; font-size: 0.98rem; white-space: nowrap; }
.review-card .rv-meta { color: var(--muted-2); font-size: 0.84rem; display: flex; gap: 12px; flex-wrap: wrap; margin-top: 4px; align-items: center; }
.review-card .rv-body { color: var(--muted); font-size: 0.94rem; margin-top: 12px; white-space: pre-wrap; line-height: 1.6; }
.stars { display: inline-flex; gap: 1px; }
.stars svg { width: 15px; height: 15px; }
.star-on { color: #f5b301; } .star-off { color: var(--muted-2); }
.star-input { display: inline-flex; gap: 4px; }
.star-input button { background: none; border: none; cursor: pointer; padding: 2px; color: var(--muted-2); }
.star-input button.on { color: #f5b301; }
.star-input svg { width: 26px; height: 26px; }
.locked-stat { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-weight: 600; font-size: 0.92rem; }

/* ---------- account badges ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 0.78rem; font-weight: 600; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--fg); }
.badge svg { width: 13px; height: 13px; }
.badge.admin { background: linear-gradient(120deg, #f5b301, #f59e0b); color: #1a1206; border-color: transparent; }
.badge.tier { background: var(--accent-grad); color: #06121a; border-color: transparent; }
.badge.area { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.badge.verified { color: var(--accent); }
.badge.top { color: #f5b301; border-color: color-mix(in srgb, #f5b301 45%, transparent); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto; }
}