/* PASSA - Minimalist Luxury Design System */

:root {
  /* Color palette - dark luxury theme */
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-surface-elevated: #1a1a1a;
  --color-border: #2a2a2a;
  --color-text: #f5f5f5;
  --color-text-muted: #888888;
  --color-accent: #c9a962; /* Gold accent */
  --color-accent-hover: #dbb872;
  --color-danger: #c94a4a;
  --color-success: #4ac97a;

  /* Typography */
  --font-primary: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Courier New', monospace;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html, body {
  height: 100%;
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* App container */
#app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* Screens */
.screen {
  display: none;
  flex-direction: column;
  min-height: 100vh;
  padding: var(--spacing-md);
}

.screen.active {
  display: flex;
}

/* Loading screen */
#loading {
  justify-content: center;
  align-items: center;
  gap: var(--spacing-lg);
}

.loader {
  width: 40px;
  height: 40px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Logo */
.logo {
  font-size: 2.5rem;
  font-weight: 200;
  letter-spacing: 0.5em;
  color: var(--color-text);
  text-transform: uppercase;
}

.logo-small {
  font-size: 1.25rem;
  font-weight: 200;
  letter-spacing: 0.3em;
  color: var(--color-text);
  text-transform: uppercase;
}

/* Auth screen */
.auth-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xl);
  text-align: center;
}

.tagline {
  color: var(--color-text-muted);
  font-size: 1rem;
  font-weight: 300;
}

.nfc-hint {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

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

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

.btn-secondary:hover {
  border-color: var(--color-text-muted);
}

.btn-danger {
  background-color: var(--color-danger);
  color: var(--color-text);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.75rem;
}

.btn-icon-only {
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.btn-icon-only:hover {
  color: var(--color-text);
}

.btn-icon {
  font-size: 1.25rem;
}

/* App header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

/* Tab navigation */
.tab-nav {
  display: flex;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.tab-btn {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.tab-btn::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.tab-btn.active {
  color: var(--color-text);
}

.tab-btn.active::after {
  transform: scaleX(1);
}

/* Tab content */
.tab-content {
  display: none;
  flex: 1;
  padding: var(--spacing-lg) 0;
}

.tab-content.active {
  display: flex;
  flex-direction: column;
}

/* Empty state */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-muted);
  text-align: center;
}

.empty-state .hint {
  font-size: 0.875rem;
  max-width: 280px;
}

/* Message list */
.message-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.message-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.message-item:hover {
  background-color: var(--color-surface-elevated);
}

.message-item-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-bg);
  border-radius: var(--radius-full);
  font-size: 1.25rem;
}

.message-item-content {
  flex: 1;
}

.message-item-title {
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.message-item-time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Compose form */
.compose-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-group label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: 1rem;
  resize: none;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

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

.security-note {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Settings */
.settings-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.setting-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
}

.setting-item.danger {
  border: 1px solid var(--color-danger);
}

.setting-label {
  flex: 1;
  font-size: 0.875rem;
}

.setting-value {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.setting-value.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.about-section {
  margin-top: auto;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.version {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.disclaimer {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  max-width: 300px;
  margin: 0 auto;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-md);
}

.modal.active {
  display: flex;
}

.modal-content {
  width: 100%;
  max-width: 400px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.modal-small {
  max-width: 320px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 500;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.modal-footer .btn {
  flex: 1;
}

.message-display {
  padding: var(--spacing-md);
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 300px;
  overflow-y: auto;
}

.destruct-notice {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  background-color: rgba(201, 74, 74, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--color-danger);
  text-align: center;
}

/* Utility classes */
.hidden {
  display: none !important;
}

.mono {
  font-family: var(--font-mono);
}

/* Responsive */
@media (min-width: 768px) {
  .screen {
    max-width: 480px;
    margin: 0 auto;
  }
}