/* ========================================
   GPS Verifier - Apple Liquid Design
   ======================================== */

/* CSS Variables - Apple Inspired */
:root {
    /* Colors */
    --primary-color: #007AFF;
    --primary-hover: #0051D5;
    --success-color: #34C759;
    --error-color: #FF3B30;
    --warning-color: #FF9500;
    
    /* Backgrounds - Glassmorphism */
    --bg-primary: rgba(255, 255, 255, 0.8);
    --bg-secondary: rgba(249, 249, 251, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.72);
    --bg-glass-dark: rgba(0, 0, 0, 0.05);
    
    /* Text */
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    
    /* Borders */
    --border-color: rgba(0, 0, 0, 0.06);
    
    /* Shadows - Soft and Layered */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.16);
    
    /* Radius - Apple's Continuous Curves */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    
    /* Blur */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 24px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation - Glassmorphism */
.navbar {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-lg)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Hero Section - Liquid Gradient */
.hero {
    background: transparent;
    color: white;
    padding: 4rem 0 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: liquidMove 15s ease-in-out infinite;
}

@keyframes liquidMove {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(10%, 10%) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.hero-subtitle {
    font-size: 1.375rem;
    opacity: 0.95;
    max-width: 640px;
    margin: 0 auto;
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* Main Content */
.main-content {
    padding: 3rem 0;
}

/* Upload Section */
.upload-section {
    margin-bottom: 2rem;
}

.upload-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-md)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-md)) saturate(180%);
    border-radius: var(--radius-2xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.18);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.drop-zone {
    border: 2px dashed rgba(0, 122, 255, 0.3);
    border-radius: var(--radius-xl);
    padding: 3.5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
}

.drop-zone:hover {
    border-color: var(--primary-color);
    background: rgba(0, 122, 255, 0.08);
    transform: scale(1.01);
}

.drop-zone.drag-over {
    border-color: var(--primary-color);
    border-width: 3px;
    background: rgba(0, 122, 255, 0.12);
    transform: scale(1.02);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
}

.drop-zone h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.drop-zone p {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.supported-formats {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 1rem;
}

/* Preview Section */
.preview-section {
    animation: fadeIn 0.3s;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.preview-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.btn-clear {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-clear:hover {
    background: var(--bg-secondary);
    border-color: var(--text-secondary);
}

.image-preview {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.image-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Buttons - Apple Style */
.btn-primary,
.btn-secondary {
    padding: 0.875rem 2.25rem;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 1.0625rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.4);
    transform: translateY(-2px) scale(1.02);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
    color: var(--text-primary);
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.btn-secondary:active {
    transform: translateY(0) scale(0.98);
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Results Section */
.results-section {
    animation: slideUp 0.4s;
}

.results-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-md)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-md)) saturate(180%);
    border-radius: var(--radius-2xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.18);
    animation: slideUpSmooth 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.result-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.status-badge {
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.9375rem;
    letter-spacing: -0.01em;
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
}

.status-badge.valid {
    background: rgba(52, 199, 89, 0.15);
    color: #0f7c3b;
    border: 1px solid rgba(52, 199, 89, 0.3);
    box-shadow: 0 0 20px rgba(52, 199, 89, 0.2);
}

.status-badge.invalid {
    background: rgba(255, 59, 48, 0.15);
    color: #c41e17;
    border: 1px solid rgba(255, 59, 48, 0.3);
    box-shadow: 0 0 20px rgba(255, 59, 48, 0.2);
}

/* Result Blocks - Glass Effect */
.result-block {
    margin-bottom: 2rem;
    padding: 1.75rem;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(var(--blur-sm));
    -webkit-backdrop-filter: blur(var(--blur-sm));
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.result-block:hover {
    background: rgba(255, 255, 255, 0.6);
    transform: translateX(4px);
}

.result-block h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.result-block .icon {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-item.full-width {
    grid-column: 1 / -1;
}

.info-item .label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.info-item .value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* Map Container */
.map-container {
    margin-top: 1rem;
}

.map-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s;
}

.map-link:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.map-link svg {
    width: 16px;
    height: 16px;
}

/* Result Actions */
.result-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* Error Section */
.error-section {
    animation: slideUp 0.4s;
}

.error-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.error-icon {
    width: 64px;
    height: 64px;
    color: var(--error-color);
    margin: 0 auto 1rem;
}

.error-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--error-color);
}

.error-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.error-suggestions {
    list-style: none;
    text-align: left;
    max-width: 500px;
    margin: 0 auto 2rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.error-suggestions li {
    padding: 0.5rem;
    color: var(--text-secondary);
}

.error-suggestions li::before {
    content: "• ";
    color: var(--error-color);
    font-weight: bold;
}

/* How It Works Section - Glass */
.how-it-works {
    padding: 5rem 0;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 3.5rem;
    letter-spacing: -0.02em;
    color: white;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step-card {
    text-align: center;
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-md)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-md)) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
}

.step-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 255, 255, 0.3);
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.625rem;
    font-weight: 600;
    margin: 0 auto 1.25rem;
    box-shadow: 0 4px 20px rgba(0, 122, 255, 0.4);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-card:hover .step-number {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 8px 28px rgba(0, 122, 255, 0.5);
}

.step-card h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 0.875rem;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.step-card p {
    color: var(--text-secondary);
    line-height: 1.65;
    font-size: 1.0625rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-column a {
    display: block;
    color: var(--text-tertiary);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-tertiary);
}

/* Animations - Apple Smooth */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.9;
        transform: scale(1.02);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* ========================================
   API Documentation Section
   ======================================== */
.api-docs {
    padding: 5rem 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, white 100%);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-top: 0.5rem;
    margin-bottom: 3rem;
}

.api-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.api-link-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-md));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    align-items: start;
    gap: 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
}

.api-link-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.api-link-card.interactive-docs:hover {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.05) 0%, rgba(0, 122, 255, 0.1) 100%);
}

.api-link-card.redoc-docs:hover {
    background: linear-gradient(135deg, rgba(52, 199, 89, 0.05) 0%, rgba(52, 199, 89, 0.1) 100%);
}

.api-icon {
    width: 48px;
    height: 48px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.api-link-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.api-link-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.api-endpoints {
    margin-bottom: 3rem;
}

.api-endpoints h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.endpoint-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.endpoint-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.endpoint-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.http-method {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.http-method.post {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-color);
}

.http-method.get {
    background: rgba(52, 199, 89, 0.1);
    color: var(--success-color);
}

.endpoint-path {
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.9375rem;
    color: var(--text-primary);
    background: var(--bg-glass-dark);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
}

.endpoint-description {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.endpoint-details {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.8;
}

.api-features {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--blur-md));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.api-features h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.api-features ul {
    list-style: none;
    padding: 0;
}

.api-features li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.api-features li:last-child {
    border-bottom: none;
}

.api-features strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* ========================================
   End API Documentation Section
   ======================================== */

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .result-actions {
        flex-direction: column;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .upload-card,
    .results-card {
        padding: 1.5rem;
    }

    .hero {
        padding: 2rem 0;
    }
}