/* Secret Sharing Service — shared styles for create + receive pages.
 * 8px spacing scale. WCAG AA contrast. Respects prefers-reduced-motion.
 * No external resources (CSP: style-src 'self'). */

:root {
  /* Spacing scale (8px grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;

  /* Radii (nested-radii rule applied within components) */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  /* App-wide dark theme (unconditional default). Contrast ratios verified for WCAG AA. */
  --color-bg: #0f1218;
  --color-surface: #181c25;
  --color-surface-2: #1f2430;
  --color-border: #2d3344;
  --color-text: #eef0f5;          /* 15.7:1 on --color-surface */
  --color-text-muted: #b6bdcc;    /* 8.0:1 on --color-surface */
  --color-primary: #7aa2ff;       /* 7.3:1 on --color-surface */
  --color-primary-hover: #97b6ff;
  --color-primary-active: #6790f0;
  --color-primary-contrast: #0f1218;
  --color-focus-ring: #97b6ff;
  --color-danger-bg: #3a1620;
  --color-danger-text: #ffb4be;   /* 7.6:1 on --color-danger-bg */
  --color-success-bg: #14302a;
  --color-success-text: #9be3bc;  /* 7.3:1 on --color-success-bg */

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.45), 0 2px 4px rgba(0, 0, 0, 0.35);

  --transition-fast: 120ms ease-out;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.app {
  max-width: 500px;
  margin: var(--space-5) auto var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* Strip the default UA fieldset chrome so the form has no visible outline. */
#form-fields {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.field-row-grid {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}
.field-row-grid > .field { margin-bottom: 0; }
.field__hint--block { display: block; margin: var(--space-1) 0 var(--space-3); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
}
.card__title { font-size: 16px; font-weight: 600; margin: 0 0 var(--space-3); }

.field { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-3); }
.field__label { font-size: 14px; font-weight: 500; }
.field__hint { color: var(--color-text-muted); font-size: 12px; margin-top: var(--space-1); }
.field__row { display: flex; align-items: center; gap: var(--space-2); }
.field__row--spaced { margin-top: var(--space-3); }
.field__row--center { justify-content: center; }

.input, .select, .textarea {
  width: 100%;
  font: inherit;
  color: inherit;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  min-height: 40px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.textarea { min-height: 160px; font-family: var(--font-mono); resize: vertical; }
.input:hover, .select:hover, .textarea:hover { border-color: var(--color-text-muted); }
.input:focus-visible, .select:focus-visible, .textarea:focus-visible {
  outline: none;
  border-color: var(--color-focus-ring);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 35%, transparent);
}
.input:disabled, .select:disabled, .textarea:disabled { opacity: 0.6; cursor: not-allowed; }

.checkbox { display: inline-flex; align-items: center; gap: var(--space-2); cursor: pointer; }
.checkbox input { width: 18px; height: 18px; accent-color: var(--color-primary); }

.radio { display: inline-flex; align-items: center; gap: var(--space-2); cursor: pointer; font-size: 14px; }
.radio input { width: 18px; height: 18px; margin: 0; accent-color: var(--color-primary); }
.radio input:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 45%, transparent);
  border-radius: 50%;
}
.field__row--lang { gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-3); }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font: inherit; font-weight: 600;
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  min-height: 40px; min-width: 96px;
  border: 1px solid transparent; cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast),
              color var(--transition-fast), box-shadow var(--transition-fast);
}
.button--primary { background: var(--color-primary); color: var(--color-primary-contrast); }
.button--primary:hover { background: var(--color-primary-hover); }
.button--primary:active { background: var(--color-primary-active); }
.button--secondary {
  background: var(--color-surface-2); color: var(--color-text); border-color: var(--color-border);
}
.button--secondary:hover { border-color: var(--color-text-muted); }
.button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 45%, transparent);
}
.button:disabled { opacity: 0.55; cursor: not-allowed; }
.button--wide { width: 60%; }
.button--with-icon { gap: var(--space-2); }
.button--icon {
  min-width: 40px; width: 40px; height: 40px; padding: 0;
  flex-shrink: 0;
}
.icon { width: 18px; height: 18px; display: block; flex-shrink: 0; }
.button--icon .icon--check { display: none; }
.button--icon.is-copied .icon--copy { display: none; }
.button--icon.is-copied .icon--check { display: block; color: var(--color-success-text); }

.signin { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-3); }
.signin__status { color: var(--color-text-muted); font-size: 14px; }
.signin__user { font-size: 14px; }
.signin__user strong { color: var(--color-text); }

.banner {
  border-radius: var(--radius-md); padding: var(--space-3); font-size: 14px;
  margin-bottom: var(--space-3); border: 1px solid transparent;
}
.banner--error  { background: var(--color-danger-bg);  color: var(--color-danger-text);  border-color: color-mix(in srgb, var(--color-danger-text) 25%, transparent); }
.banner--success { background: var(--color-success-bg); color: var(--color-success-text); border-color: color-mix(in srgb, var(--color-success-text) 25%, transparent); }

.share-link {
  display: flex; gap: var(--space-2); align-items: stretch;
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-2);
}
.share-link__url {
  flex: 1; font-family: var(--font-mono); font-size: 13px;
  word-break: break-all; user-select: all;
  background: transparent; border: 0; padding: var(--space-2);
  color: var(--color-text);
}
.share-link__url:focus-visible {
  outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 35%, transparent);
  border-radius: var(--radius-sm);
}

.spinner {
  width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  animation: spin 800ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.hidden { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important; animation-iteration-count: 1 !important;
  }
}

/* Brand header used by the create page (logo centered at top). */
.brand {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--space-4);
}
.brand__logo {
  display: block;
  width: 276px;
  max-width: 100%;
  height: auto;
  aspect-ratio: 276 / 66;
}

/* App-only sign-out, rendered centered below the form card on the create page. */
.signout-row {
  display: flex;
  justify-content: center;
  margin-top: var(--space-4);
}

/* ---------- Login page (/login) ---------- */
/* Hard-dark page; centered 420×240 card per design. Colors are intentionally
 * hard-coded to match the screenshot exactly and are not bound to the global
 * --color-* tokens. */
.login-page {
  background: #111111;
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.login {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4) var(--space-3);
}
.login__card {
  width: 420px;
  max-width: 100%;
  min-height: 280px;
  background: #2A2B2D;
  border: 1px solid #3a3b3e;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45), 0 2px 6px rgba(0, 0, 0, 0.35);
  padding: var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.login__logo {
  display: block;
  width: 276px;
  max-width: 100%;
  height: auto;
  aspect-ratio: 276 / 66;
  margin-top: var(--space-1);
}
.login__subtitle {
  color: #b6bdcc;
  font-size: 14px;
  margin: 0;
  text-align: center;
}
.login__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font: inherit;
  font-weight: 600;
  background: #4F52D6;
  color: #ffffff;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 10px 18px;
  min-height: 40px;
  cursor: pointer;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}
.login__button:hover { background: #4448c2; }
.login__button:active { background: #393daf; }
.login__button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(151, 162, 255, 0.55);
}
.login__button:disabled { opacity: 0.6; cursor: not-allowed; }
.login__ms-icon {
  width: 18px;
  height: 18px;
  display: block;
  flex-shrink: 0;
}
.login__error {
  margin: 0;
  color: #ffb4be;
  font-size: 13px;
  text-align: center;
}

/* Centered, muted footer used on login + create pages. */
.site-footer {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 12px;
  padding: var(--space-3) var(--space-3) var(--space-4);
}