/* ============================================================================
   Welcome Page - Brutally Minimal Clinical Design
   Physics of Parasitism Color Scheme (ADR-005)
   ============================================================================ */

/* CSS Variables - Light Mode (Default) */
:root {
  /* Brand Colors (Physics of Parasitism) */
  --accent-primary: #EB1F17;
  --accent-secondary: #1DA924;
  --accent-hover: #C91810;
  --accent-muted: #E88A86;

  /* Background Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-tertiary: #E9ECEF;

  /* Text Colors */
  --text-primary: #343A40;
  --text-secondary: #6C757D;
  --text-muted: #ADB5BD;
  --text-on-accent: #FFFFFF;

  /* Border Colors */
  --border-color: #DEE2E6;
  --border-light: #E9ECEF;

  /* Semantic Colors */
  --success-color: #1DA924;
  --warning-color: #FFC107;
  --danger-color: #DC3545;
  --info-color: #17A2B8;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

/* Dark Mode */
[data-theme="dark"] {
  --accent-primary: #EB1F17;
  --accent-secondary: #28A745;
  --accent-hover: #FF3B30;
  --accent-muted: #E88A86;

  --bg-primary: #1A1A1A;
  --bg-secondary: #2D2D2D;
  --bg-tertiary: #3D3D3D;

  --text-primary: #F8F9FA;
  --text-secondary: #ADB5BD;
  --text-muted: #6C757D;
  --text-on-accent: #FFFFFF;

  --border-color: #4D4D4D;
  --border-light: #3D3D3D;

  --success-color: #28A745;
  --warning-color: #FFD93D;
  --danger-color: #FF6B6B;
  --info-color: #4ECDC4;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.4);
}

/* ============================================================================
   Reset & Base
   ============================================================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================================
   Logo Row - Top Right
   ============================================================================ */

.logo-row {
  position: fixed;
  top: 32px;
  right: 32px;
  display: flex;
  gap: 20px;
  align-items: center;
  z-index: 100;
}

.logo-link {
  display: block;
  opacity: 0.75;
  transition: opacity 0.2s ease;
}

.logo-link:hover {
  opacity: 1;
}

.logo {
  height: 64px;
  width: auto;
  display: block;
  border-radius: 4px;
}

/* ============================================================================
   Theme Toggle - Top Left
   ============================================================================ */

.theme-toggle {
  position: fixed;
  top: 32px;
  left: 32px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  z-index: 100;
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--text-muted);
}

.theme-icon {
  width: 20px;
  height: 20px;
  color: var(--text-primary);
}

/* Show sun in dark mode, moon in light mode */
.theme-icon.sun {
  display: none;
}

.theme-icon.moon {
  display: block;
}

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

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

/* ============================================================================
   Main Container
   ============================================================================ */

.welcome-main {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 48px;
}

/* ============================================================================
   Header - Swiss Typography
   ============================================================================ */

.welcome-header {
  text-align: center;
  margin-bottom: 48px;
}

.welcome-header h1 {
  font-size: 2.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.2;
}

.tagline {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================================================
   Auth Container
   ============================================================================ */

.auth-container {
  width: 100%;
  max-width: 440px;
}

/* Auth Tabs */
.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
}

.auth-tab {
  flex: 1;
  padding: 14px 24px;
  background: transparent;
  border: none;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.2s ease;
  position: relative;
}

.auth-tab:hover {
  color: var(--text-primary);
}

.auth-tab.active {
  color: var(--accent-primary);
}

.auth-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent-primary);
}

/* Auth Forms */
.auth-form {
  animation: fadeIn 0.2s ease;
}

.auth-form.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Form Groups */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(235, 31, 23, 0.1);
}

[data-theme="dark"] .form-group input:focus {
  box-shadow: 0 0 0 3px rgba(235, 31, 23, 0.2);
}

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

.form-group small {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* Form Rows (for register form) */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Messages */
.error-message {
  background-color: rgba(220, 53, 69, 0.1);
  border: 1px solid var(--danger-color);
  color: var(--danger-color);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  margin-bottom: 20px;
  display: none;
}

.error-message.visible {
  display: block;
}

.success-message {
  background-color: rgba(29, 169, 36, 0.1);
  border: 1px solid var(--success-color);
  color: var(--success-color);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  margin-bottom: 20px;
  display: none;
}

.success-message.visible {
  display: block;
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn-primary {
  width: 100%;
  padding: 16px 24px;
  font-size: 0.8125rem;
  font-weight: 600;
  font-family: inherit;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background-color: var(--accent-primary);
  color: var(--text-on-accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  margin-top: 8px;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

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

.btn-primary:active {
  transform: scale(0.98);
}

/* ============================================================================
   Authenticated State
   ============================================================================ */

.authenticated-container {
  text-align: center;
  max-width: 320px;
}

.authenticated-container.hidden {
  display: none;
}

.welcome-user {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.welcome-user span {
  color: var(--text-primary);
  font-weight: 500;
}

.btn-launch {
  display: block;
  margin-bottom: 16px;
  padding: 18px 32px;
  font-size: 0.875rem;
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 12px 24px;
  font-size: 0.8125rem;
  font-family: inherit;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* Admin link */
.admin-link {
  display: block;
  margin-top: 24px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ============================================================================
   Loading Overlay
   ============================================================================ */

.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.loading-overlay.visible {
  display: flex;
}

.loading-content {
  background-color: var(--bg-primary);
  padding: 40px 56px;
  border-radius: 12px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px;
}

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

.loading-content p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ============================================================================
   Responsive
   ============================================================================ */

@media (max-width: 768px) {
  .logo-row {
    top: 20px;
    right: 20px;
    gap: 12px;
  }

  .logo {
    height: 48px;
  }

  .theme-toggle {
    top: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
  }

  .welcome-main {
    padding: 100px 20px 40px;
  }

  .welcome-header h1 {
    font-size: 1.75rem;
  }

  .tagline {
    font-size: 0.9375rem;
  }

  .auth-container {
    max-width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

@media (max-width: 480px) {
  .logo-row {
    top: 16px;
    right: 16px;
    gap: 8px;
  }

  .logo {
    height: 40px;
  }

  .theme-toggle {
    top: 16px;
    left: 16px;
    width: 36px;
    height: 36px;
  }

  .welcome-main {
    padding: 90px 16px 32px;
  }

  .welcome-header {
    margin-bottom: 36px;
  }

  .welcome-header h1 {
    font-size: 1.5rem;
  }

  .auth-tabs {
    margin-bottom: 24px;
  }

  .auth-tab {
    padding: 12px 16px;
    font-size: 0.75rem;
  }
}

/* ============================================================================
   Utility
   ============================================================================ */

.hidden {
  display: none !important;
}