:root {
  color-scheme: light;
  --ink-deep: #02011b;
  --ink-saturated: #04006c;
  --deep-indigo: #003ab8;
  --indigo: #015cfe;
  --violet: #7b4cff;
  --magenta: #c010e8;
  --aqua: #0a786b;
  --success: #038566;
  --ink: #0b0a24;
  --ink-dim: rgba(11, 10, 36, 0.62);
  --ink-faint: rgba(11, 10, 36, 0.48);
  --line: rgba(11, 10, 36, 0.1);
  --line-hover: rgba(11, 10, 36, 0.24);
  --focus-ring: rgba(1, 92, 254, 0.32);
  --page-background:
    radial-gradient(900px 650px at 92% 95%, rgba(123, 76, 255, 0.1), transparent 62%),
    radial-gradient(800px 600px at 8% 0%, rgba(1, 92, 254, 0.1), transparent 60%),
    linear-gradient(180deg, #e9eeff 0%, #f1f3fc 45%, #f7f7fa 100%);
  --header-background: rgba(247, 247, 250, 0.76);
  --surface: rgba(255, 255, 255, 0.92);
  --surface-soft: rgba(255, 255, 255, 0.72);
  --control-background: rgba(255, 255, 255, 0.72);
  --control-hover: #ffffff;
  --field-background: rgba(255, 255, 255, 0.84);
  --card-shadow: 0 18px 42px rgba(11, 10, 36, 0.08);
  --control-shadow: 0 8px 20px rgba(11, 10, 36, 0.08);
  /* White wordmark -> ink. brightness(0) ONLY — calculator-style
     sepia/hue-rotate chains compute differently per engine (iOS Safari
     rendered the old chain MAGENTA). Pure black is deterministic in every
     browser and reads as attendInkDeep (#02011B) at header size. */
  --logo-filter: brightness(0);
  --aqua-border: rgba(10, 120, 107, 0.3);
  --aqua-bloom: rgba(10, 120, 107, 0.08);
  --aqua-fill: rgba(10, 120, 107, 0.12);
  --violet-border: rgba(123, 76, 255, 0.26);
  --violet-bloom: rgba(123, 76, 255, 0.1);
  --modal-backdrop: rgba(11, 10, 36, 0.56);
  --error: #b42318;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --aqua: #29f5d5;
  --ink: #ffffff;
  --ink-dim: rgba(255, 255, 255, 0.72);
  --ink-faint: rgba(255, 255, 255, 0.5);
  --line: rgba(255, 255, 255, 0.16);
  --line-hover: rgba(255, 255, 255, 0.28);
  --page-background:
    radial-gradient(900px 650px at 92% 95%, rgba(123, 76, 255, 0.28), transparent 62%),
    radial-gradient(800px 600px at 8% 0%, rgba(0, 58, 184, 0.32), transparent 60%),
    linear-gradient(180deg, #04006c 0%, #02022a 45%, #02011b 100%);
  --header-background: rgba(2, 1, 27, 0.42);
  --surface: rgba(255, 255, 255, 0.06);
  --surface-soft: rgba(255, 255, 255, 0.04);
  --control-background: rgba(255, 255, 255, 0.06);
  --control-hover: rgba(255, 255, 255, 0.1);
  --field-background: rgba(2, 1, 27, 0.35);
  --card-shadow: 0 18px 42px rgba(2, 1, 27, 0.28);
  --control-shadow: none;
  --logo-filter: none;
  --aqua-border: rgba(41, 245, 213, 0.28);
  --aqua-bloom: rgba(41, 245, 213, 0.1);
  --aqua-fill: rgba(41, 245, 213, 0.14);
  --violet-border: rgba(123, 76, 255, 0.34);
  --violet-bloom: rgba(123, 76, 255, 0.16);
  --modal-backdrop: rgba(2, 1, 27, 0.72);
  --error: #ff8a8a;
}

body {
  background: var(--page-background);
  background-attachment: fixed;
}

.site-header {
  background: var(--header-background);
}

.brand img {
  filter: var(--logo-filter);
}

.theme-toggle {
  width: 38px;
  height: 38px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: var(--control-background);
  box-shadow: var(--control-shadow);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--line-hover);
  background: var(--control-hover);
}

.theme-toggle:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 17px;
  height: 17px;
}

.theme-toggle .theme-icon-sun,
:root[data-theme="dark"] .theme-toggle .theme-icon-moon {
  display: none;
}

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

.theme-picker {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--control-background);
  box-shadow: var(--control-shadow);
}

.theme-picker button {
  min-width: 58px;
  height: 30px;
  padding: 0 10px;
  border: 0;
  border-radius: 999px;
  color: var(--ink-dim);
  background: transparent;
  font: inherit;
  font-size: 12px;
  font-weight: 650;
  line-height: 1;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, transform 120ms ease;
}

.theme-picker button:hover {
  color: var(--ink);
  transform: translateY(-1px);
}

.theme-picker button:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.theme-picker button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--control-hover);
}

.phone-control,
.btn-ghost {
  border-color: var(--line);
  background: var(--control-background);
  box-shadow: var(--control-shadow);
}

.phone-control:hover,
.btn-ghost:hover {
  border-color: var(--line-hover);
  background: var(--control-hover);
}

.download-card,
.pillar,
.app-download .card {
  border-color: var(--line);
  background: var(--surface);
  box-shadow: var(--card-shadow);
}

.demo-card {
  border-color: var(--aqua-border);
  background:
    radial-gradient(420px 200px at 6% 0%, var(--aqua-bloom), transparent 70%),
    var(--surface);
  box-shadow: var(--card-shadow);
}

.contact-card {
  border-color: var(--line);
  background: var(--surface);
  box-shadow: var(--card-shadow);
}

.demo-input,
.contact-input,
.contact-select,
.contact-textarea {
  background: var(--field-background);
  color: var(--ink);
}

.mp-icon,
.pillar {
  background-color: var(--surface-soft);
}

.pillar .icon {
  background: var(--aqua-fill);
}

.section-label::before {
  background: var(--line-hover);
}

.demo-note.is-error,
.contact-note.is-error {
  color: var(--error);
}

.qr-modal {
  background: var(--modal-backdrop);
}

.app-download p {
  color: var(--ink-dim);
}

.app-download {
  color: var(--ink);
}

.app-download .theme-toggle {
  position: fixed;
  z-index: 10;
  top: max(18px, env(safe-area-inset-top));
  right: max(18px, env(safe-area-inset-right));
}

@media (max-width: 640px) {
  .site-header .brand img {
    height: 12px;
  }

  .site-header .header-login {
    display: none;
  }

  .site-header .theme-toggle {
    width: 34px;
    height: 34px;
  }

  .theme-picker button {
    min-width: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle {
    transition: none;
  }

  .theme-picker button {
    transition: none;
  }
}