/* ================================
   INFLATION CALCULATOR - MAIN STYLES
   ================================ */

:root {
    /* Primary Colors */
    --primary-color: #323b34;
    --primary-dark: #25b34a;
    --primary-light: #323b34;
    
    /* Secondary Colors */
    --secondary-color: #323b34;
    --secondary-light: #4a5850;
    
    /* Light Theme */
    --bg-light: #ffffff;
    --bg-light-alt: #f8f9fa;
    --text-light: #212529;
    --text-light-secondary: #6c757d;
    --border-light: #dee2e6;
    --shadow-light: rgba(0, 0, 0, 0.1);
    
    /* Dark Theme */
    --bg-dark: #1a1d1f;
    --bg-dark-alt: #252829;
    --text-dark: #e8eaed;
    --text-dark-secondary: #9aa0a6;
    --border-dark: #3c4043;
    --shadow-dark: rgba(0, 0, 0, 0.3);
    
    /* Semantic Colors */
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Borders */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Light Theme (Default) */
body {
    --bg-primary: var(--bg-light);
    --bg-secondary: var(--bg-light-alt);
    --text-primary: var(--text-light);
    --text-secondary: var(--text-light-secondary);
    --border-color: var(--border-light);
    --shadow-color: var(--shadow-light);
}

/* Dark Theme */
body.dark-theme {
    --bg-primary: var(--bg-dark);
    --bg-secondary: var(--bg-dark-alt);
    --text-primary: var(--text-dark);
    --text-secondary: var(--text-dark-secondary);
    --border-color: var(--border-dark);
    --shadow-color: var(--shadow-dark);
}

/* ================================
   RESET & BASE STYLES
   ================================ */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ================================
   UTILITIES
   ================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ================================
   SIDEBAR NAVIGATION
   ================================ */

.sidebar {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100vh;
    background: var(--bg-secondary);
    box-shadow: 2px 0 10px var(--shadow-color);
    z-index: var(--z-modal);
    transition: left var(--transition-base);
    overflow-y: auto;
}

.sidebar.active {
    left: 0;
}

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

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.close-sidebar {
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.close-sidebar:hover {
    background: var(--primary-color);
    color: white;
}

.sidebar-menu {
    list-style: none;
    padding: var(--spacing-md) 0;
}

.sidebar-menu li {
    margin: 0;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: var(--bg-primary);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

.sidebar-menu i {
    width: 20px;
    font-size: var(--font-size-lg);
}

.sidebar-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.theme-toggle-btn {
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
    background: var(--primary-color);
    color: white;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ================================
   HEADER
   ================================ */

.header {
    background: var(--bg-secondary);
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.menu-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--primary-color);
    color: white;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.header-logo i {
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
}

/* Language Selector */
.language-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

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

.lang-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 20px var(--shadow-color);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

.language-selector:hover .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.lang-dropdown a:hover {
    background: var(--primary-color);
    color: white;
}

.lang-dropdown a:first-child {
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.lang-dropdown a:last-child {
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

/* ================================
   HERO SECTION
   ================================ */

.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: var(--spacing-xxl) 0;
    overflow: hidden;
    min-height: 500px;
    display: flex;
    align-items: center;
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    opacity: 0.1;
}

.particle {
    position: absolute;
    color: white;
    font-size: var(--font-size-3xl);
    animation: float 15s infinite ease-in-out;
}

.particle:nth-child(1) {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 20%;
    left: 80%;
    animation-delay: 2s;
}

.particle:nth-child(3) {
    top: 60%;
    left: 20%;
    animation-delay: 4s;
}

.particle:nth-child(4) {
    top: 70%;
    left: 70%;
    animation-delay: 6s;
}

.particle:nth-child(5) {
    top: 40%;
    left: 50%;
    animation-delay: 8s;
}

.particle:nth-child(6) {
    top: 80%;
    left: 40%;
    animation-delay: 10s;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl));
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(var(--font-size-base), 2vw, var(--font-size-xl));
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-xl);
    backdrop-filter: blur(10px);
}

.feature-badge i {
    font-size: var(--font-size-lg);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xxl);
    background: white;
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    font-weight: 700;
    border-radius: var(--border-radius-xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-base);
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.3);
    color: var(--primary-dark);
}

/* ================================
   INTRODUCTION SECTION
   ================================ */

.intro-section {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-primary);
}

.intro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xxl);
    align-items: center;
}

.intro-text h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.intro-text p {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.info-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 20px var(--shadow-color);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow-color);
}

.info-card > i {
    font-size: var(--font-size-4xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.info-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.info-card ul {
    list-style: none;
}

.info-card li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.info-card li i {
    color: var(--success-color);
    margin-top: 4px;
    flex-shrink: 0;
}

/* ================================
   FEATURES SECTION
   ================================ */

.features-section {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

.features-section h2 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-xxl);
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px var(--shadow-color);
    border-color: var(--primary-color);
}

.feature-item i {
    font-size: var(--font-size-4xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.feature-item h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ================================
   FOOTER
   ================================ */

.footer {
    background: var(--secondary-color);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xxl);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-brand i {
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-col h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: var(--spacing-sm);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
    margin-bottom: var(--spacing-sm);
}

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

@media (max-width: 768px) {
    .header-logo span {
        display: none;
    }
    
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-features {
        flex-direction: column;
        align-items: stretch;
    }
    
    .feature-badge {
        justify-content: center;
    }
    
    .intro-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .sidebar {
        width: 100%;
        left: -100%;
    }
}