:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-ink: #09090b;
  --color-muted: #71717a;
  --color-line: #e4e4e7;
  --color-line-strong: #d4d4d8;
  --color-primary: #18181b;
  --color-primary-ink: #fafafa;
  --color-danger: #dc2626;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --shadow-panel: 0 1px 2px rgba(24, 24, 27, 0.06);
  --shadow-focus: 0 0 0 3px rgba(24, 24, 27, 0.12);
  --radius-sm: 4px;
  --radius-md: 6px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --border-width: 1px;
  --control-height: 44px;
  --control-small-height: 36px;
  --app-option-height: 48px;
  --state-dot-size: 10px;
  --button-group-min: 148px;
  --content-width: 760px;
  --qr-card-size: 180px;
  --qr-image-size: 156px;
  --qr-empty-size: 120px;
  --app-option-min: 128px;
  --toast-width: 360px;
  --font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.25rem;
  --duration-fast: 140ms;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-family);
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--color-bg);
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

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

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 10;
  padding: var(--space-2) var(--space-3);
  transform: translateY(calc(-100% - var(--space-6)));
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  transition: transform var(--duration-fast) ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: var(--space-4);
}

.panel,
.generated-card,
.app-card,
.info-block {
  border: var(--border-width) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-panel);
}

.panel {
  display: grid;
  gap: var(--space-4);
  margin: var(--space-4) 0;
  padding: var(--space-4);
}

.login-panel {
  min-height: calc(100vh - (var(--space-4) * 2));
  place-items: center;
  align-content: center;
}

.stack,
.stack-tight,
.activation-summary,
.subscription-renderer,
.platform-panels,
.platform-panel,
.app-details,
.app-card,
.info-block,
.button-group,
.action-form,
.field,
.generated-card {
  display: grid;
}

.stack,
.activation-summary,
.subscription-renderer,
.platform-panels,
.platform-panel,
.app-details,
.app-card {
  gap: var(--space-4);
}

.stack-tight,
.button-group,
.field,
.generated-card,
.info-block,
.action-form {
  gap: var(--space-3);
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

h1,
.panel h2,
.app-card h4,
.info-block h4 {
  color: var(--color-ink);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(1.5rem, 7vw, 2.25rem);
}

.panel h2 {
  font-size: var(--text-lg);
}

.app-card h4,
.info-block h4 {
  font-size: var(--text-md);
}

.muted,
.form-status,
.app-card p,
.info-block p {
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.compact {
  font-size: var(--text-xs);
}

.button,
.app-option {
  min-height: var(--control-height);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: var(--border-width) solid var(--color-line-strong);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition:
    border-color var(--duration-fast) ease,
    background-color var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
}

.button:hover,
.app-option:hover {
  background: var(--color-bg);
}

.button-primary {
  width: 100%;
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.button-primary:hover {
  background: var(--color-primary);
}

.button-secondary {
  background: var(--color-surface);
  color: var(--color-ink);
}

.button-small {
  min-height: var(--control-small-height);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.field label {
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
}

.field input,
.field select,
.copy-row input {
  width: 100%;
  min-height: var(--control-height);
  border: var(--border-width) solid var(--color-line-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  padding: var(--space-2) var(--space-3);
  outline: none;
}

.field select {
  appearance: auto;
}

.field input:focus,
.field select:focus,
.copy-row input:focus,
.button:focus-visible,
.app-option:focus-visible {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
  outline: none;
}

.copy-row {
  display: grid;
  gap: var(--space-2);
}

.generated-card[hidden],
.platform-panel[hidden],
.app-card[hidden] {
  display: none;
}

.state {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  align-items: center;
}

.state-dot {
  width: var(--state-dot-size);
  height: var(--state-dot-size);
  border-radius: 50%;
  background: var(--color-muted);
}

.state-pending .state-dot {
  background: var(--color-warning);
}

.state-success .state-dot {
  background: var(--color-success);
}

.state-warning .state-dot {
  background: var(--color-warning);
}

.state-error .state-dot {
  background: var(--color-danger);
}

.qr-card {
  width: min(var(--qr-card-size), 100%);
  display: grid;
  place-items: center;
  justify-self: center;
  border: var(--border-width) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: var(--space-3);
}

.qr-card span {
  width: var(--qr-empty-size);
  height: var(--qr-empty-size);
  display: grid;
  place-items: center;
  border: var(--border-width) solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.qr-card img {
  width: min(var(--qr-image-size), 100%);
  border-radius: var(--radius-sm);
}

.app-picker {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--app-option-min)), 1fr));
  gap: var(--space-2);
}

.app-option {
  width: 100%;
  min-height: var(--app-option-height);
  justify-content: space-between;
  text-align: left;
}

.app-option.is-active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.app-option small {
  color: var(--color-muted);
  font-size: var(--text-xs);
  font-weight: 500;
}

.app-option.is-active small {
  color: var(--color-primary-ink);
}

.app-card,
.info-block {
  padding: var(--space-4);
}

.status-code {
  color: var(--color-danger);
  font-size: clamp(2rem, 18vw, 5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.06em;
}

.toast {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  left: var(--space-4);
  z-index: 20;
  padding: var(--space-3) var(--space-4);
  transform: translateY(calc(100% + var(--space-6)));
  border: var(--border-width) solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-panel);
  opacity: 0;
  transition:
    opacity var(--duration-fast) ease,
    transform var(--duration-fast) ease;
}

.toast.is-visible {
  transform: translateY(0);
  opacity: 1;
}

@media (min-width: 680px) {
  .shell {
    padding: var(--space-8) var(--space-6);
  }

  .panel {
    padding: var(--space-6);
  }

  .copy-row,
  .subscription-row {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .button-primary {
    width: auto;
  }

  .button-group {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--button-group-min)), 1fr));
  }

  .action-form {
    grid-template-columns: auto 1fr;
    align-items: center;
  }

  .toast {
    right: var(--space-6);
    left: auto;
    max-width: var(--toast-width);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
  }
}