/* ===================================================================
   MODERN CV WEBSITE - MAIN STYLES
   Component-based CSS architecture with custom properties
   =================================================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400&display=swap');

/* ===================================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   =================================================================== */
:root {
  /* Color Palette */
  --color-primary: #1e6674;
  --color-secondary: #2d2d2d;
  --color-background-light: #fafafa;
  --color-background-dark: #2d2d2d;
  --color-surface: #ffffff;
  --color-surface-elevated: #f8f9fa;
  --color-text-primary: #2d2d2d;
  --color-text-secondary: #666666;
  --color-text-light: #999999;
  --color-border: #e0e0e0;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-elevated: rgba(0, 0, 0, 0.15);
  
  /* Gradients */
  --gradient-header: linear-gradient(135deg, #B0BEC5 0%, #CFD8DC 50%, #ECEFF1 100%);
  --gradient-sidebar: linear-gradient(180deg, #B0BEC5 0%, #CFD8DC 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8f9fa 100%);
  
  /* Typography */
  --font-family-primary: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 2rem;       /* 32px */
  --font-size-4xl: 2.5rem;     /* 40px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing System */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */
  --space-4xl: 6rem;      /* 96px */
  
  /* Layout */
  --container-max-width: 1200px;
  --sidebar-width: 350px;
  --border-radius-sm: 4px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px var(--color-shadow);
  --shadow: 0 2px 4px var(--color-shadow);
  --shadow-md: 0 4px 8px var(--color-shadow);
  --shadow-lg: 0 8px 16px var(--color-shadow);
  --shadow-xl: 0 16px 32px var(--color-shadow);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-all: all var(--transition-normal);
  
  /* Z-index scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ===================================================================
   RESET & BASE STYLES
   =================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Remove default margins and paddings */
h1, h2, h3, h4, h5, h6,
p, ul, ol, li,
figure, blockquote {
  margin: 0;
  padding: 0;
}

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

a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

/* Lists */
ul, ol {
  list-style: none;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Buttons */
button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  margin: 0;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  transition: var(--transition-all);
}

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

/* App Container - Main Grid Layout */
.app-container {
  display: grid;
  grid-template-areas: 
    "header header"
    "sidebar main"
    "footer footer";
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  max-width: var(--container-max-width);
  margin: 0 auto;
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
}

/* Header */
.app-header {
  grid-area: header;
  background: var(--gradient-header);
  padding: var(--space-xl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
  opacity: 0.3;
  pointer-events: none;
}

/* Sidebar */
.app-sidebar {
  grid-area: sidebar;
  background: var(--gradient-sidebar);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* Main Content */
.app-main {
  grid-area: main;
  padding: var(--space-xl) var(--space-2xl);
  background: var(--color-surface);
  overflow-y: auto;
}

/* Footer */
.app-footer {
  grid-area: footer;
  background: var(--gradient-header);
  padding: var(--space-xl) var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* ===================================================================
   COMPONENT STYLES
   =================================================================== */

/* Card Component */
.card {
  background: var(--gradient-card);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow);
  transition: var(--transition-all);
  border: 1px solid var(--color-border);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: var(--space-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.card-content {
  color: var(--color-text-secondary);
}

/* Section Component */
.section {
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--color-secondary);
}

/* Header Content */
.header-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.header-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  font-style: italic;
}

/* Language Switcher */
.language-switcher {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 2;
}

.language-switcher-list {
  display: flex;
  gap: var(--space-sm);
}

.language-switcher-item {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius);
  transition: var(--transition-all);
  overflow: hidden;
}

.language-switcher-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: var(--transition-all);
}

.language-switcher-item:hover {
  background: var(--color-surface);
  box-shadow: var(--shadow);
}

.language-switcher-item.active {
  background: var(--color-primary);
}

.language-switcher-item.active .language-switcher-link {
  color: var(--color-surface);
}

/* Profile Image */
.profile-image-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-xl);
}

.profile-image {
  width: 200px;
  height: 200px;
  border-radius: var(--border-radius-xl);
  object-fit: cover;
  object-position: center;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-all);
  border: 4px solid rgba(255, 255, 255, 0.9);
}

.profile-image:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.skill-icon {
  width: 50px;
  height: 50px;
  object-fit: contain;
  transition: var(--transition-all);
  filter: grayscale(20%);
}

.skill-icon:hover {
  transform: translateY(-4px);
  filter: grayscale(0%);
}

/* Experience Timeline */
.experience-timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.experience-timeline::before {
  content: '';
  position: absolute;
  left: var(--space-md);
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
}

.experience-item {
  position: relative;
  margin-bottom: var(--space-2xl);
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition-all);
}

.experience-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) - 6px);
  top: var(--space-lg);
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow);
}

.experience-item:hover {
  transform: translateX(var(--space-sm));
  box-shadow: var(--shadow-md);
}

.experience-period {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-xs);
}

.experience-company {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.experience-position {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.experience-responsibilities {
  margin-top: var(--space-md);
}

.responsibility-item {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  position: relative;
}

.responsibility-item::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

.responsibility-title {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.responsibility-description {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Skills List */
.skills-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.skill-item {
  background: var(--color-surface-elevated);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: var(--transition-all);
  border-left: 3px solid var(--color-primary);
}

.skill-item:hover {
  background: var(--color-surface);
  transform: translateX(var(--space-xs));
}

/* Footer Content */
.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  text-align: center;
}

.footer-section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-all);
}

.footer-link:hover {
  color: var(--color-secondary);
  transform: translateY(-2px);
}

/* PDF Button */
.pdf-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--border-radius);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-all);
  box-shadow: var(--shadow);
  margin: var(--space-sm);
}

.pdf-button:hover {
  background: var(--color-secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--color-surface);
}

.pdf-button:active {
  transform: translateY(0);
}

/* Loading Indicator */
.loading-indicator {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-surface);
  padding: var(--space-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-modal);
  display: none;
  text-align: center;
}

.loading-indicator.visible {
  display: block;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-md);
}

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

/* ===================================================================
   ANIMATION CLASSES
   =================================================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stagger animation for child elements */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.stagger-children.animate-in > * {
  opacity: 1;
  transform: translateY(0);
}

.stagger-children.animate-in > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.animate-in > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.animate-in > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.animate-in > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.animate-in > *:nth-child(5) { transition-delay: 0.5s; }

/* ===================================================================
   RESPONSIVE DESIGN
   =================================================================== */

/* Tablet Styles */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 300px;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  .app-main {
    padding: var(--space-xl) var(--space-lg);
  }
  
  .header-title {
    font-size: var(--font-size-3xl);
  }
}

/* Mobile Styles */
@media (max-width: 768px) {
  :root {
    --font-size-base: 1.125rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  .app-container {
    grid-template-areas: 
      "header"
      "main"
      "footer";
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }
  
  .app-sidebar {
    display: none;
  }
  
  .app-header {
    padding: var(--space-lg);
  }
  
  .app-main {
    padding: var(--space-lg);
  }
  
  .header-title {
    font-size: var(--font-size-2xl);
    letter-spacing: 0.05em;
  }
  
  .header-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .language-switcher {
    position: static;
    margin-top: var(--space-lg);
    display: flex;
    justify-content: center;
  }
  
  .profile-image {
    width: 150px;
    height: 150px;
  }
  
  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
  }
  
  .skill-icon {
    width: 40px;
    height: 40px;
  }
  
  .experience-timeline {
    padding-left: var(--space-lg);
  }
  
  .experience-timeline::before {
    left: var(--space-sm);
  }
  
  .experience-item::before {
    left: calc(-1 * var(--space-lg) - 6px);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* Small Mobile Styles */
@media (max-width: 480px) {
  .app-header,
  .app-main,
  .app-footer {
    padding: var(--space-md);
  }
  
  .header-title {
    font-size: var(--font-size-xl);
  }
  
  .header-subtitle {
    font-size: var(--font-size-base);
  }
  
  .profile-image {
    width: 120px;
    height: 120px;
  }
  
  .skills-list {
    grid-template-columns: 1fr;
  }
  
  .experience-item {
    padding: var(--space-md);
  }
}

/* Print Styles */
@media print {
  .app-container {
    grid-template-areas: 
      "header header"
      "sidebar main";
    grid-template-columns: 300px 1fr;
    grid-template-rows: auto 1fr;
    max-width: none;
    box-shadow: none;
  }
  
  .app-footer {
    display: none;
  }
  
  .language-switcher {
    display: none;
  }
  
  .pdf-button {
    display: none;
  }
  
  .animate-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
  
  * {
    transition: none !important;
    animation: none !important;
  }
}