/* BC10 Mail product site — BrandCode10 "Liquid Glass".
   Tokens mirror the desktop app (apps/desktop/src/renderer/src/index.css: Light / Dark / Glassy)
   and the bc10-id base theme (#6B6577 / #8B84A0 muted foreground). Never hard-code colours below
   the token blocks. */

:root {
  color-scheme: light;
  --bg: #eef0f7;
  --bg-grad: linear-gradient(135deg, #eceff8 0%, #f5f2fb 45%, #e9f0f8 100%);
  --orb-1: rgba(124, 92, 236, 0.26);
  --orb-2: rgba(80, 150, 240, 0.18);
  --orb-3: rgba(236, 120, 190, 0.12);
  --fg: #1b1924;
  --muted-fg: #55505f;
  --card: rgba(255, 255, 255, 0.62);
  --card-strong: rgba(255, 255, 255, 0.86);
  --card-edge: rgba(255, 255, 255, 0.9);
  --line: rgba(28, 24, 56, 0.11);
  --primary: #5b3ccc;
  --primary-2: #7d5bea;
  --primary-fg: #ffffff;
  --accent: rgba(120, 90, 230, 0.12);
  --shadow: 0 1px 2px rgba(28, 24, 56, 0.05), 0 10px 30px -12px rgba(28, 24, 56, 0.18);
  --shadow-lg: 0 1px 2px rgba(28, 24, 56, 0.06), 0 30px 70px -20px rgba(28, 24, 56, 0.32);
  --read: #2f8a55;
  --opened: #5b3ccc;
  --auto: #b8661a;
  --none: #6b6577;
  --warn-bg: rgba(224, 137, 47, 0.12);
  --warn-line: rgba(184, 102, 26, 0.35);
  --code-bg: rgba(28, 24, 56, 0.06);
  --radius: 18px;
  --radius-sm: 12px;
  --font: 'Segoe UI Variable Text', 'Segoe UI Variable', 'Segoe UI', system-ui, -apple-system,
    'Helvetica Neue', Arial, sans-serif;
  --font-display: 'Segoe UI Variable Display', 'Segoe UI Variable', 'Segoe UI', system-ui,
    -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Cascadia Code', 'Cascadia Mono', Consolas, 'SFMono-Regular', Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    color-scheme: dark;
    --bg: #14111f;
    --bg-grad: linear-gradient(160deg, #17132a 0%, #120f1c 55%, #0f1320 100%);
    --orb-1: rgba(142, 107, 245, 0.28);
    --orb-2: rgba(80, 140, 245, 0.16);
    --orb-3: rgba(220, 100, 180, 0.1);
    --fg: #f3f0fa;
    --muted-fg: #a59fb8;
    --card: rgba(255, 255, 255, 0.055);
    --card-strong: rgba(30, 26, 43, 0.82);
    --card-edge: rgba(255, 255, 255, 0.1);
    --line: rgba(255, 255, 255, 0.1);
    --primary: #8e6bf5;
    --primary-2: #a98bff;
    --primary-fg: #ffffff;
    --accent: rgba(150, 115, 245, 0.18);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 10px 30px -12px rgba(0, 0, 0, 0.55);
    --shadow-lg: 0 1px 2px rgba(0, 0, 0, 0.35), 0 30px 70px -20px rgba(0, 0, 0, 0.7);
    --read: #5ccf8a;
    --opened: #b39cff;
    --auto: #f0a85a;
    --none: #8b84a0;
    --warn-bg: rgba(240, 168, 90, 0.1);
    --warn-line: rgba(240, 168, 90, 0.35);
    --code-bg: rgba(255, 255, 255, 0.07);
  }
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #14111f;
  --bg-grad: linear-gradient(160deg, #17132a 0%, #120f1c 55%, #0f1320 100%);
  --orb-1: rgba(142, 107, 245, 0.28);
  --orb-2: rgba(80, 140, 245, 0.16);
  --orb-3: rgba(220, 100, 180, 0.1);
  --fg: #f3f0fa;
  --muted-fg: #a59fb8;
  --card: rgba(255, 255, 255, 0.055);
  --card-strong: rgba(30, 26, 43, 0.82);
  --card-edge: rgba(255, 255, 255, 0.1);
  --line: rgba(255, 255, 255, 0.1);
  --primary: #8e6bf5;
  --primary-2: #a98bff;
  --primary-fg: #ffffff;
  --accent: rgba(150, 115, 245, 0.18);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 10px 30px -12px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 1px 2px rgba(0, 0, 0, 0.35), 0 30px 70px -20px rgba(0, 0, 0, 0.7);
  --read: #5ccf8a;
  --opened: #b39cff;
  --auto: #f0a85a;
  --none: #8b84a0;
  --warn-bg: rgba(240, 168, 90, 0.1);
  --warn-line: rgba(240, 168, 90, 0.35);
  --code-bg: rgba(255, 255, 255, 0.07);
}

/* ---------- Base ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Soft colour orbs behind the glass. */
body::before {
  content: '';
  position: fixed;
  inset: -20vmax;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(38vmax 30vmax at 82% 8%, var(--orb-1), transparent 70%),
    radial-gradient(34vmax 28vmax at 8% 62%, var(--orb-2), transparent 70%),
    radial-gradient(30vmax 24vmax at 70% 95%, var(--orb-3), transparent 70%);
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--primary-2);
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 6px;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.2rem, 5.6vw, 3.9rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  font-weight: 650;
}

h3 {
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1em;
}

code,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.1em 0.4em;
  word-break: break-all;
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 16px;
  top: 12px;
  z-index: 100;
  background: var(--card-strong);
  padding: 8px 14px;
  border-radius: 10px;
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

@media (min-width: 640px) {
  .wrap {
    padding: 0 28px;
  }
}

.muted {
  color: var(--muted-fg);
}

.small {
  font-size: 0.875rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
}

.glass {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  backdrop-filter: blur(22px) saturate(160%);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass {
    background: var(--card-strong);
  }
}

@media (prefers-reduced-transparency: reduce) {
  .glass {
    background: var(--card-strong);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 12px 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px 8px 14px;
  border-radius: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  text-decoration: none;
  font-weight: 650;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  margin-right: auto;
  white-space: nowrap;
}

.brand img {
  width: 30px;
  height: 30px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-links a {
  color: var(--muted-fg);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 6px 10px;
  border-radius: 10px;
}

.nav-links a:hover,
.nav-links a[aria-current='page'] {
  color: var(--fg);
  background: var(--accent);
}

.nav-links .hide-sm {
  display: none;
}

@media (min-width: 720px) {
  .nav-links .hide-sm {
    display: inline-block;
  }
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  flex: none;
}

.icon-btn:hover {
  background: var(--accent);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 22px;
  border-radius: 14px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn svg {
  width: 20px;
  height: 20px;
  flex: none;
}

.btn-primary {
  color: var(--primary-fg);
  background: linear-gradient(135deg, var(--primary-2), var(--primary));
  box-shadow: 0 10px 26px -10px var(--primary);
}

.btn-primary:hover {
  color: var(--primary-fg);
  transform: translateY(-1px);
  box-shadow: 0 14px 32px -10px var(--primary);
}

.btn-ghost {
  color: var(--fg);
  background: var(--card);
  border-color: var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.btn-ghost:hover {
  color: var(--fg);
  background: var(--accent);
}

.btn-sm {
  min-height: 36px;
  padding: 6px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
}

.btn-block {
  width: 100%;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-label {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
  text-align: left;
}

.btn-label small {
  font-weight: 500;
  font-size: 0.78rem;
  opacity: 0.85;
}

/* ---------- Sections ---------- */

main {
  display: block;
}

section {
  padding: 56px 0;
}

@media (min-width: 900px) {
  section {
    padding: 84px 0;
  }
}

.section-head {
  max-width: 720px;
  margin-bottom: 36px;
}

.section-head p {
  color: var(--muted-fg);
  font-size: 1.08rem;
}

/* ---------- Hero ---------- */

.hero {
  padding-top: 40px;
}

.hero-grid {
  display: grid;
  gap: 44px;
  align-items: center;
}

@media (min-width: 980px) {
  .hero-grid {
    grid-template-columns: 1.02fr 1fr;
    gap: 56px;
  }
}

.hero h1 .grad {
  background: linear-gradient(120deg, var(--primary-2), var(--primary) 50%, #4f7fe8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  color: var(--muted-fg);
  max-width: 560px;
  margin-bottom: 28px;
}

.hero-meta {
  margin-top: 18px;
  font-size: 0.88rem;
  color: var(--muted-fg);
}

/* App window mock (pure HTML, no screenshots) */

.mock {
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted-fg);
}

.dots {
  display: flex;
  gap: 6px;
  margin-right: 8px;
}

.dots i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
}

.mock-body {
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .mock-body {
    grid-template-columns: 150px 1fr;
  }
}

.mock-side {
  display: none;
  padding: 14px 10px;
  border-right: 1px solid var(--line);
  font-size: 0.82rem;
}

@media (min-width: 560px) {
  .mock-side {
    display: block;
  }
}

.mock-side div {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 8px;
  color: var(--muted-fg);
}

.mock-side .on {
  background: var(--accent);
  color: var(--fg);
  font-weight: 600;
}

.acct {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.mock-list {
  list-style: none;
  margin: 0;
  padding: 6px;
}

.mock-list li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 12px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 0.86rem;
}

.mock-list li + li {
  border-top: 1px solid var(--line);
}

.mock-list .who {
  font-weight: 600;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.mock-list .subj {
  grid-column: 1 / -1;
  color: var(--muted-fg);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* Tracking status chips */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid currentColor;
  background: color-mix(in srgb, currentColor 10%, transparent);
}

.chip::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.chip.read {
  color: var(--read);
}

.chip.opened {
  color: var(--opened);
}

.chip.auto {
  color: var(--auto);
}

.chip.none {
  color: var(--none);
}

.chip.none::before {
  background: transparent;
  border: 1.5px solid currentColor;
}

/* ---------- Tracking explainer ---------- */

.status-grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 720px) {
  .status-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1040px) {
  .status-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.status {
  padding: 22px;
}

.status .conf {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted-fg);
  margin: 14px 0 6px;
}

.meter {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.meter i {
  height: 5px;
  flex: 1;
  border-radius: 3px;
  background: var(--line);
}

.meter.c3 i,
.meter.c2 i:nth-child(-n + 2),
.meter.c1 i:nth-child(1) {
  background: currentColor;
}

.status p {
  font-size: 0.94rem;
  color: var(--muted-fg);
  margin: 0;
}

.signals {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

@media (min-width: 860px) {
  .signals {
    grid-template-columns: repeat(3, 1fr);
  }
}

.signal {
  padding: 22px;
}

.signal h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

.signal p {
  color: var(--muted-fg);
  font-size: 0.95rem;
  margin: 0;
}

.callout {
  margin-top: 28px;
  padding: 22px 24px;
  display: grid;
  gap: 6px;
}

.callout strong {
  font-family: var(--font-display);
  font-size: 1.1rem;
}

/* ---------- Features ---------- */

.feature-grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  padding: 24px;
}

.feature p {
  color: var(--muted-fg);
  font-size: 0.95rem;
  margin: 0;
}

.ficon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  margin-bottom: 14px;
  color: var(--primary);
  background: var(--accent);
  border: 1px solid var(--line);
}

.ficon svg {
  width: 22px;
  height: 22px;
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: 6px;
  vertical-align: 2px;
  color: var(--muted-fg);
  border: 1px solid var(--line);
}

/* ---------- Split / privacy summary ---------- */

.split {
  display: grid;
  gap: 18px;
}

@media (min-width: 880px) {
  .split {
    grid-template-columns: 1fr 1fr;
  }
}

.panel {
  padding: 28px;
}

.ticks {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.ticks li {
  position: relative;
  padding-left: 28px;
}

.ticks li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.45em;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--read);
  border-bottom: 2px solid var(--read);
  transform: rotate(-45deg);
}

/* ---------- CTA band ---------- */

.cta {
  padding: 40px 28px;
  text-align: center;
  display: grid;
  justify-items: center;
  gap: 8px;
}

.cta .btn-row {
  justify-content: center;
  margin-top: 14px;
}

/* ---------- Download page ---------- */

.dl-grid {
  display: grid;
  gap: 18px;
  align-items: start;
}

@media (min-width: 920px) {
  .dl-grid {
    grid-template-columns: 1.2fr 1fr;
  }
}

.dl-card {
  padding: 28px;
}

.dl-card .btn-row {
  margin: 18px 0 8px;
}

.version {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 0.9rem;
  color: var(--muted-fg);
}

.alt-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 0.9rem;
  margin-top: 6px;
}

.notice {
  margin-top: 22px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
}

.notice h3 {
  margin-bottom: 6px;
}

.notice ol {
  margin: 8px 0 0;
  padding-left: 22px;
}

.notice li + li {
  margin-top: 4px;
}

.specs {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.specs th,
.specs td {
  text-align: left;
  vertical-align: top;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.specs th {
  width: 38%;
  padding-right: 14px;
  font-weight: 600;
}

.specs tr:last-child th,
.specs tr:last-child td {
  border-bottom: 0;
}

.hash {
  margin-top: 16px;
  font-size: 0.84rem;
}

.hash code {
  display: block;
  margin-top: 6px;
  padding: 10px 12px;
  line-height: 1.5;
}

details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

details:last-child {
  border-bottom: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  margin: 10px 0 0;
  color: var(--muted-fg);
}

/* ---------- Prose (privacy) ---------- */

.prose {
  max-width: 780px;
  padding: 32px 22px;
}

@media (min-width: 640px) {
  .prose {
    padding: 44px 48px;
  }
}

.prose h2 {
  font-size: 1.45rem;
  margin-top: 1.8em;
}

.prose h3 {
  margin-top: 1.4em;
}

.prose ul {
  padding-left: 22px;
}

.prose li + li {
  margin-top: 6px;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 8px 0 18px;
  display: block;
  overflow-x: auto;
}

.prose th,
.prose td {
  text-align: left;
  vertical-align: top;
  padding: 9px 12px 9px 0;
  border-bottom: 1px solid var(--line);
  min-width: 140px;
}

.prose th {
  font-weight: 600;
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 36px 0 44px;
  font-size: 0.9rem;
  color: var(--muted-fg);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-links a {
  color: var(--muted-fg);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--fg);
}

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: no-preference) {
  .rise {
    animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  }

  .rise.d1 {
    animation-delay: 0.08s;
  }

  .rise.d2 {
    animation-delay: 0.16s;
  }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(14px);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn {
    transition: none;
  }
}

.tone-read {
  color: var(--read);
}

.tone-opened {
  color: var(--opened);
}

.tone-auto {
  color: var(--auto);
}

.tone-none {
  color: var(--none);
}

[hidden] {
  display: none !important;
}

/* Theme toggle icon: moon in light mode, sun in dark mode. */
[data-theme-toggle] .i-sun {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) [data-theme-toggle] .i-sun {
    display: block;
  }

  :root:not([data-theme='light']) [data-theme-toggle] .i-moon {
    display: none;
  }
}

:root[data-theme='dark'] [data-theme-toggle] .i-sun {
  display: block;
}

:root[data-theme='dark'] [data-theme-toggle] .i-moon {
  display: none;
}

.prose .draft-note {
  font-size: 0.9rem;
}

@media (max-width: 420px) {
  .brand span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .nav {
    gap: 8px;
  }
}

.acct {
  background: currentColor;
}