/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Neutral Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Typography */
    --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Container Width */
    --container-max: 1400px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
}

/* Reset & Base Styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

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

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

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

/* ===================================
   Utility Classes
   =================================== */
.hidden {
    display: none !important;
}

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

/* ===================================
   Privacy Banner
   =================================== */
.privacy-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-md);
    z-index: 1000;
    animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.privacy-content {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.privacy-content i {
    font-size: 1.5rem;
}

.privacy-content p {
    flex: 1;
    margin: 0;
    color: white;
}

.close-banner {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    min-width: 44px;
    min-height: 44px;
}

.close-banner:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 1.25rem;
    color: var(--text-primary);
    transition: all var(--transition-base);
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
    transform: rotate(180deg);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero-title {
    margin: var(--spacing-lg) 0 var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
}

/* ===================================
   Upload Zone
   =================================== */
.upload-zone {
    position: relative;
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    margin: var(--spacing-xl) auto;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-secondary);
    animation: fadeInScale 0.5s ease-out 0.2s both;
}

@keyframes fadeInScale {
    from {
        transform: scale(0.95);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.upload-zone.drag-over {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.upload-subtext {
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.supported-formats {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.format-badge {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* ===================================
   Loading Spinner
   =================================== */
.loading-spinner {
    text-align: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

#loadingText {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===================================
   Results Section
   =================================== */
.results-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
    animation: slideUp 0.5s ease-out;
}

.results-container {
    max-width: var(--container-max);
    margin: 0 auto;
}

/* GPS Warning */
.gps-warning {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(245, 158, 11, 0.1));
    border: 2px solid var(--warning-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    align-items: start;
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.gps-warning i {
    font-size: 2rem;
    color: var(--warning-color);
}

.gps-warning strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.action-btn {
    flex: 1;
    min-width: 150px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-primary);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 44px;
}

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

.action-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
}

.action-btn.primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   Tabs
   =================================== */
.tabs-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.tabs {
    display: flex;
    background: var(--bg-primary);
    border-bottom: 2px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: thin;
}

.tab {
    flex: 1;
    min-width: 120px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 3px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 44px;
}

.tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--bg-secondary);
}

.tab i {
    font-size: 1.125rem;
}

/* Tab Panels */
.tab-content {
    padding: var(--spacing-xl);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-panel.active {
    display: block;
}

/* ===================================
   Metadata Display
   =================================== */
.metadata-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
    animation: staggerFadeIn 0.5s ease-out;
}

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

.metadata-item {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    animation: slideInBounce 0.4s ease-out both;
}

@keyframes slideInBounce {
    0% {
        transform: translateY(20px);
        opacity: 0;
    }
    60% {
        transform: translateY(-5px);
        opacity: 1;
    }
    100% {
        transform: translateY(0);
    }
}

.metadata-item:nth-child(1) { animation-delay: 0.05s; }
.metadata-item:nth-child(2) { animation-delay: 0.1s; }
.metadata-item:nth-child(3) { animation-delay: 0.15s; }
.metadata-item:nth-child(4) { animation-delay: 0.2s; }
.metadata-item:nth-child(5) { animation-delay: 0.25s; }
.metadata-item:nth-child(6) { animation-delay: 0.3s; }

.metadata-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.metadata-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.metadata-value {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    word-wrap: break-word;
}

.metadata-value.mono {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
}

/* Image Preview */
.image-preview {
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.image-preview img {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    display: block;
}

/* Map Container */
.map-container {
    width: 100%;
    height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
    background: var(--bg-tertiary);
}

.map-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Color Palette */
.color-palette {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.color-swatch {
    aspect-ratio: 1;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
    cursor: pointer;
}

.color-swatch:hover {
    transform: scale(1.1);
}

/* Histogram */
.histogram-container {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
}

.histogram-canvas {
    width: 100%;
    height: 200px;
}

/* ===================================
   Features Section
   =================================== */
.features-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: var(--bg-secondary);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    animation: fadeInScale 0.5s ease-out both;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.feature-card p {
    font-size: 0.9375rem;
}

/* ===================================
   About Section
   =================================== */
.about-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
}

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

.footer-content {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

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

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

.social-links a {
    width: 44px;
    height: 44px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.footer-bottom p {
    color: var(--text-tertiary);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .upload-zone {
        padding: var(--spacing-xl);
    }
    
    .tabs {
        flex-wrap: nowrap;
        justify-content: flex-start;
    }
    
    .tab {
        flex: 0 0 auto;
        font-size: 0.875rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
    }
    
    .metadata-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===================================
   Accessibility
   =================================== */
:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .header, .footer, .action-buttons, .privacy-banner {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}