/* ============================================================
   One-Time Secret — Application Styles
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-primary: #1e3a5f;
  --color-primary-hover: #152d4a;
  --color-primary-light: #e8eef5;
  --color-secondary: #4a6fa5;
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #5a6270;
  --color-border: #d1d5db;
  --color-border-focus: #4a6fa5;
  --color-error: #c0392b;
  --color-error-bg: #fdecea;
  --color-success: #1a7f37;
  --color-success-bg: #e6f9ed;
  --color-warning: #92400e;
  --color-warning-bg: #fef3c7;
  --color-warning-border: #f59e0b;
  --color-link: #2563eb;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --radius: 6px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --focus-ring: 0 0 0 3px rgba(74, 111, 165, 0.4);
  --transition: 150ms ease;
}

/* --- Reset / Normalize --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Header / Navigation --- */
header[role="banner"] {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 0 1.5rem;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  height: 56px;
}

.nav-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-title:hover {
  opacity: 0.9;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-link {
  color: #ffffff;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius);
  transition: background-color var(--transition);
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

.nav-link:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

.nav-btn {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.375rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--transition);
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

.nav-btn:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

/* --- Main Content --- */
main[role="main"] {
  flex: 1;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* --- Views --- */
.view {
  animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.view h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.view > p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

/* --- Auth Panels --- */
.auth-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.auth-panel h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.auth-toggle {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* --- Form Controls --- */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--color-text);
}

.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="text"],
.form-group textarea,
.form-group select {
  display: block;
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--focus-ring);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235a6270' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
  cursor: pointer;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.form-help {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 0.375rem;
  line-height: 1.4;
}

/* --- Character Counter --- */
.char-count {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-align: right;
  margin-top: 0.25rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.5;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-light);
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-link);
  font-size: inherit;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.btn-link:hover {
  color: var(--color-primary);
}

.btn-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Error & Success Messages --- */
.form-error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1rem;
  line-height: 1.4;
}

.form-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1rem;
  line-height: 1.4;
}

/* --- Secret Warning Box --- */
.secret-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid var(--color-warning-border);
  border-left: 4px solid var(--color-warning-border);
  border-radius: var(--radius);
  padding: 0.875rem 1rem;
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.secret-warning strong {
  font-weight: 700;
}

/* --- Secret Display --- */
.secret-display {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.secret-content {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--color-text);
  margin: 0;
}

/* --- Link Display --- */
.link-display {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.75rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

.secret-link-output {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-primary);
  word-break: break-all;
  padding: 0.5rem 0.625rem;
  background-color: var(--color-primary-light);
  border-radius: calc(var(--radius) - 2px);
  display: flex;
  align-items: center;
  line-height: 1.4;
}

.link-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

/* --- Footer --- */
footer[role="contentinfo"] {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

/* --- Utility: hidden attribute support --- */
[hidden] {
  display: none !important;
}

/* --- Responsive: Mobile Adjustments --- */
@media (max-width: 640px) {
  header nav {
    height: 48px;
  }

  .nav-title {
    font-size: 1.1rem;
  }

  main[role="main"] {
    padding: 1.25rem 1rem;
  }

  .view h1 {
    font-size: 1.375rem;
  }

  .auth-panel {
    padding: 1.25rem 1rem;
  }

  .link-display {
    flex-direction: column;
  }

  .link-display .btn-secondary {
    width: 100%;
  }

  .btn {
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }
}

/* --- Accessibility: Focus Visible --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Override for inputs that use box-shadow focus instead */
.form-group input:focus-visible,
.form-group textarea:focus-visible,
.form-group select:focus-visible {
  outline: none;
}

/* --- Accessibility: Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}