/**
 * Main Stylesheet
 * Custom Calculator Theme
 */

/* ============================================
   CSS Variables (Light Mode)
   ============================================ */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-secondary: #7c3aed;
    --color-tertiary: #059669;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    --color-border: #e5e7eb;
    --color-error: #dc2626;
    --color-success: #059669;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* ============================================
   Dark Mode Variables
   ============================================ */
[data-theme="dark"] {
    --color-text: #f9fafb;
    --color-text-light: #d1d5db;
    --color-bg: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;
    --color-border: #4b5563;
    --color-error: #ef4444;
    --color-success: #10b981;
}

[data-theme="dark"] #theme-color-meta {
    content: "#111827";
}

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

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

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

/* ============================================
   Container
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
    transition: var(--transition);
}

[data-theme="dark"] .site-header {
    background-color: rgba(17, 24, 39, 0.9);
}

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

.site-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.site-title a {
    color: var(--color-text);
}

.main-navigation .nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.main-navigation a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
}

.main-navigation a:hover {
    color: var(--color-primary);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    transform: scale(1.1);
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
    animation: fadeInUp 0.6s ease-out;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.5;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: #6d28d9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-tertiary {
    background-color: var(--color-tertiary);
    color: white;
}

.btn-tertiary:hover {
    background-color: #047857;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-calculate {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    margin-top: var(--spacing-md);
}

/* ============================================
   Features Marquee
   ============================================ */
.features-marquee {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-md) 0;
    overflow: hidden;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.marquee-container {
    overflow: hidden;
    white-space: nowrap;
}

.marquee-content {
    display: inline-flex;
    animation: marquee 30s linear infinite;
    gap: var(--spacing-xl);
}

.marquee-item {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text-light);
    padding: 0 var(--spacing-md);
    white-space: nowrap;
}

@keyframes marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* ============================================
   Tools Section
   ============================================ */
.tools-section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.tool-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.tool-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.tool-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.tool-description {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
}

/* ============================================
   Calculator Page
   ============================================ */
.calculator-page {
    padding: var(--spacing-xl) 0;
    min-height: 60vh;
}

.calculator-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-title {
    margin-bottom: var(--spacing-md);
}

.page-description {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

.calculator-container {
    max-width: 600px;
    margin: 0 auto;
}

.calculator-form {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-family: var(--font-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-error {
    display: block;
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    min-height: 1.25rem;
}

.form-help {
    display: block;
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.input-with-unit {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.input-with-unit .form-input {
    flex: 1;
}

.input-unit {
    color: var(--color-text-light);
    font-weight: 500;
}

.calculator-result {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.4s ease-out;
}

.result-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.result-item.result-total {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.result-item.result-total .result-label,
.result-item.result-total .result-value {
    color: white;
}

.result-label {
    font-weight: 600;
    color: var(--color-text);
}

.result-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-heading);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-2xl);
    text-align: center;
}

.footer-content p {
    color: var(--color-text-light);
    margin: 0;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .header-content {
        flex-wrap: wrap;
    }
    
    .main-navigation {
        order: 3;
        width: 100%;
    }
    
    .main-navigation .nav-menu {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .calculator-form,
    .calculator-result {
        padding: var(--spacing-md);
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
}