/* Modern Monochrome Design System */

/* ========================================
   CSS VARIABLES - MONOCHROME PALETTE
======================================== */
:root {
  /* Monochrome Colors */
  --color-black: #000000;
  --color-gray-900: #0f0f0f;
  --color-gray-800: #1a1a1a;
  --color-gray-700: #2d2d2d;
  --color-gray-600: #404040;
  --color-gray-500: #6b6b6b;
  --color-gray-400: #9ca3af;
  --color-gray-300: #d1d5db;
  --color-gray-200: #e5e7eb;
  --color-gray-100: #f3f4f6;
  --color-white: #ffffff;
  
  /* Semantic Colors */
  --color-primary: var(--color-black);
  --color-secondary: var(--color-gray-700);
  --color-background: var(--color-white);
  --color-surface: var(--color-gray-100);
  --color-border: var(--color-gray-200);
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-500);
  
  /* Accent Colors (minimal use) */
  --color-accent: var(--color-gray-800);
  --color-success: #059669;
  --color-warning: #d97706;
  --color-error: #dc2626;
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-display: 'Playfair Display', Georgia, serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Font Sizes */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  --text-6xl: 3.75rem;   /* 60px */
  
  /* Spacing */
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-5: 1.25rem;    /* 20px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */
  
  /* Borders */
  --border-width: 1px;
  --border-width-2: 2px;
  --border-radius-sm: 0.25rem;
  --border-radius: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --navbar-height: 72px;
  --footer-height: 80px;
}

/* ========================================
   RESET & BASE STYLES
======================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

*::before,
*::after {
  box-sizing: border-box;
}

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========================================
   TYPOGRAPHY
======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-semibold);
  line-height: 1.25;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
}

h1 { font-size: var(--text-5xl); font-weight: var(--font-weight-bold); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Links */
a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
}

a:hover {
  color: var(--color-gray-600);
}

a.link-underline {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--color-gray-300);
}

a.link-underline:hover {
  text-decoration-color: var(--color-text-primary);
}

/* ========================================
   LAYOUT COMPONENTS
======================================== */

/* Loading Spinner */
.loading-spinner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-background);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.loading-spinner.active {
  opacity: 1;
  visibility: visible;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-gray-200);
  border-top: 3px solid var(--color-black);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Navigation */
.navbar {
  height: var(--navbar-height);
  background-color: var(--color-background);
  border-bottom: var(--border-width) solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

/* Navigation Components */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  height: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.nav__brand {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  text-decoration: none;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-medium);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

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

.nav__link--active {
  color: var(--color-primary);
  background-color: var(--color-background-secondary);
}

/* User Navigation */
.nav__user {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--border-radius);
  transition: background-color var(--transition-fast);
}

.nav__user:hover {
  background-color: var(--color-background-secondary);
}

.nav__avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-background);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
}

/* Dropdown Menu */
.nav__dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 280px;
  max-width: 320px;
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  border: var(--border-width) solid var(--color-border);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  margin-top: var(--space-2);
}

/* User menu hover feedback */
.nav__user {
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav__user:hover {
  background-color: rgba(0, 0, 0, 0.05);
  border-radius: var(--border-radius);
}

/* Dropdown hover will be handled by JavaScript for better control
.nav__user:hover .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
*/

.nav__dropdown-section {
  padding: var(--space-3) 0;
}

.nav__dropdown-section:not(:last-child) {
  border-bottom: var(--border-width) solid var(--color-border);
}

.nav__dropdown-header {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  margin: 0 0 var(--space-1) 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__dropdown-header i {
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.nav__dropdown-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  color: var(--color-text);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav__dropdown-link:hover {
  background-color: var(--color-background-secondary);
  color: var(--color-primary);
  text-decoration: none;
}

.nav__dropdown-link i {
  width: 1rem;
  text-align: center;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

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

.nav__dropdown-divider {
  height: var(--border-width);
  background-color: var(--color-border);
  margin: var(--space-2) 0;
}

/* Special styling for logout button */
.nav__dropdown-link.btn-logout {
  color: var(--color-error);
  font-weight: var(--font-medium);
}

.nav__dropdown-link.btn-logout:hover {
  background-color: rgb(254 242 242);
  color: rgb(185 28 28);
}

.nav__dropdown-link.btn-logout i {
  color: var(--color-error);
}

.nav__dropdown-link.btn-logout:hover i {
  color: rgb(185 28 28);
}

/* Main Content */
.main-content {
  flex: 1;
  min-height: calc(100vh - var(--navbar-height) - var(--footer-height));
}

.page-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

/* Messages */
.messages-container {
  position: fixed;
  top: calc(var(--navbar-height) + var(--space-4));
  right: var(--space-4);
  z-index: 1050;
  max-width: 400px;
}

.message {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  background-color: var(--color-background);
  border: var(--border-width) solid var(--color-border);
  animation: slideInRight 0.3s ease-out;
}

.message--success {
  border-color: var(--color-success);
  color: var(--color-success);
}

.message--error {
  border-color: var(--color-error);
  color: var(--color-error);
}

.message--warning {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.message__close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-gray-400);
  margin-left: auto;
  padding: var(--space-1);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.message__close:hover {
  color: var(--color-gray-600);
  background-color: var(--color-gray-100);
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Footer */
.footer {
  height: var(--footer-height);
  background-color: var(--color-gray-900);
  color: var(--color-white);
  border-top: var(--border-width) solid var(--color-gray-800);
}

/* ========================================
   UTILITY CLASSES
======================================== */

/* Spacing */
.m-0 { margin: 0; }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Margin/Padding Directions */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.pt-0 { padding-top: 0; }
.pt-4 { padding-top: var(--space-4); }
.pt-8 { padding-top: var(--space-8); }
.pb-0 { padding-bottom: 0; }
.pb-4 { padding-bottom: var(--space-4); }
.pb-8 { padding-bottom: var(--space-8); }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* Flexbox */
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Width & Height */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* Borders */
.border { border: var(--border-width) solid var(--color-border); }
.border-t { border-top: var(--border-width) solid var(--color-border); }
.border-b { border-bottom: var(--border-width) solid var(--color-border); }
.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-full { border-radius: var(--border-radius-full); }

/* Shadows */
.shadow { box-shadow: var(--shadow); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Background Colors */
.bg-white { background-color: var(--color-white); }
.bg-gray-50 { background-color: var(--color-gray-100); }
.bg-gray-100 { background-color: var(--color-gray-100); }
.bg-gray-900 { background-color: var(--color-gray-900); }
.bg-black { background-color: var(--color-black); }

/* Text Colors */
.text-white { color: var(--color-white); }
.text-black { color: var(--color-black); }
.text-gray-500 { color: var(--color-gray-500); }
.text-gray-600 { color: var(--color-gray-600); }
.text-gray-900 { color: var(--color-gray-900); }

/* ========================================
   RESPONSIVE DESIGN
======================================== */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2.5rem;
    --text-4xl: 2rem;
    --text-3xl: 1.75rem;
    --navbar-height: 64px;
  }
  
  .page-container {
    padding: var(--space-4) var(--space-3);
  }
  
  .messages-container {
    left: var(--space-3);
    right: var(--space-3);
    max-width: none;
  }
  
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }
}

/* ========================================
   DARK MODE SUPPORT (Optional)
======================================== */
@media (prefers-color-scheme: dark) {
  .dark-mode-auto {
    --color-background: var(--color-gray-900);
    --color-surface: var(--color-gray-800);
    --color-border: var(--color-gray-700);
    --color-text-primary: var(--color-white);
    --color-text-secondary: var(--color-gray-300);
    --color-text-muted: var(--color-gray-400);
  }
}

/* ========================================
   LANGUAGE SELECTOR
======================================== */
.navbar__language {
  display: flex;
  align-items: center;
  margin-left: var(--space-3);
}

.language-selector {
  position: relative;
}

.language-selector__toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
}

.language-selector__toggle:hover {
  background: var(--color-surface);
  border-color: var(--color-gray-300);
}

.language-selector__current {
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.05em;
}

.language-selector__menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-1);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 140px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
}

.language-selector__menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-form {
  margin: 0;
  padding: 0;
}

.language-selector__option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.language-selector__option:hover {
  background: var(--color-surface);
}

.language-selector__option:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.language-selector__option:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.flag-icon {
  width: 16px;
  height: 12px;
  border-radius: 2px;
  background-size: cover;
  background-position: center;
  display: inline-block;
}

.flag-icon-us {
  background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTIiIHZpZXdCb3g9IjAgMCAxNiAxMiIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHJlY3Qgd2lkdGg9IjE2IiBoZWlnaHQ9IjEyIiBmaWxsPSIjQjIyMjM0Ii8+CjxyZWN0IHk9IjAuOTIzMDc3IiB3aWR0aD0iMTYiIGhlaWdodD0iMC45MjMwNzciIGZpbGw9IndoaXRlIi8+Cjwvc3ZnPgo=');
}

.flag-icon-es {
  background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTIiIHZpZXdCb3g9IjAgMCAxNiAxMiIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHJlY3Qgd2lkdGg9IjE2IiBoZWlnaHQ9IjEyIiBmaWxsPSIjQUEwMDFBIi8+CjxyZWN0IHk9IjMiIHdpZHRoPSIxNiIgaGVpZ2h0PSI2IiBmaWxsPSIjRkZEQjAwIi8+Cjwvc3ZnPgo=');
}

.flag-icon-de {
  background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTIiIHZpZXdCb3g9IjAgMCAxNiAxMiIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4KPHJlY3Qgd2lkdGg9IjE2IiBoZWlnaHQ9IjQiIGZpbGw9IiMwMDAiLz4KPHJlY3QgeT0iNCIgd2lkdGg9IjE2IiBoZWlnaHQ9IjQiIGZpbGw9IiNERAAwMDBBIi8+CjxyZWN0IHk9IjgiIHdpZHRoPSIxNiIgaGVpZ2h0PSI0IiBmaWxsPSIjRkZEQjAwIi8+Cjwvc3ZnPgo=');
}

@media (max-width: 768px) {
  .navbar__language {
    margin-left: 0;
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
  }
  
  .language-selector__menu {
    right: auto;
    left: 0;
  }
}