/* Design System and Tokens */
:root {
    --font-primary: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
    
    /* Light Mode Palette */
    --bg-app: #f8fafc;
    --bg-surface: rgba(255, 255, 255, 0.85);
    --bg-surface-solid: #ffffff;
    --border-color: rgba(226, 232, 240, 0.8);
    --border-focus: #6366f1;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: rgba(79, 70, 229, 0.1);
    
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.1);
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

/* Dark Mode Palette */
[data-theme="dark"] {
    --bg-app: #0b0f19;
    --bg-surface: rgba(17, 24, 39, 0.8);
    --bg-surface-solid: #111827;
    --border-color: rgba(37, 99, 235, 0.1);
    --border-focus: #818cf8;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.15);
    
    --success: #34d399;
    --success-light: rgba(52, 211, 153, 0.1);
    --warning: #fbbf24;
    --warning-light: rgba(251, 191, 36, 0.1);
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.1);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
}

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-primary);
}

body {
    background-color: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.03) 0px, transparent 50%);
    background-attachment: fixed;
}

header {
    background-color: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0.75rem 2rem;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-section h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.025em;
}

.logo-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Switcher Button */
.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    color: var(--text-primary);
    background-color: var(--primary-light);
    border-color: var(--primary);
    transform: translateY(-1px);
}

/* Container & Layout */
.main-wrapper {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 1.5rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .main-wrapper {
        grid-template-columns: 1fr;
    }
}

/* Sidebar Navigation */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid transparent;
    background-color: transparent;
    text-align: left;
    transition: all 0.2s ease;
}

.nav-item i {
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

.nav-item:hover {
    color: var(--text-primary);
    background-color: var(--bg-surface);
    border-color: var(--border-color);
}

.nav-item.active {
    color: var(--primary);
    background-color: var(--primary-light);
    border-color: rgba(99, 102, 241, 0.2);
    font-weight: 600;
}

.nav-item.active i {
    color: var(--primary);
}

/* Content Area */
.content-area {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Card Style */
.card {
    background-color: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.2);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.card-title i {
    color: var(--primary);
}

/* Form Styles */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

@media (max-width: 576px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group-full {
    grid-column: 1 / -1;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    width: 16px;
    height: 16px;
    pointer-events: none;
}

.form-control {
    width: 100%;
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
}

/* Button Styles */
.btn-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    user-select: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(99, 102, 241, 0.3);
}

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

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

.btn-danger {
    background-color: var(--danger-light);
    border-color: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

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

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

/* Converter Panel Layout */
.converter-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 1200px) {
    .converter-layout {
        grid-template-columns: 1fr;
    }
}

.results-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Result Card Styles */
.result-card {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
    transition: all 0.2s ease;
}

.result-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--text-muted);
}

.result-card.active-wgs84::before { background-color: var(--primary); }
.result-card.active-gcj02::before { background-color: var(--success); }
.result-card.active-bd09::before { background-color: var(--warning); }
.result-card.active-mercator::before { background-color: #ec4899; }

.result-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-info {
    display: flex;
    flex-direction: column;
}

.result-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.result-badge {
    padding: 0.15rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 600;
}

.badge-wgs84 { background: rgba(99, 102, 241, 0.1); color: var(--primary); }
.badge-gcj02 { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-bd09 { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-mercator { background: rgba(236, 72, 153, 0.1); color: #ec4899; }

.result-values {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 0.25rem;
}

.value-box {
    background-color: var(--bg-app);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.value-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
}

.value-text {
    font-size: 0.9rem;
    font-weight: 600;
    font-family: monospace;
    word-break: break-all;
}

.result-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.btn-text-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.btn-text-icon:hover {
    background-color: var(--primary-light);
    color: var(--primary);
}

/* Map Style */
#map-container {
    height: 480px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}

#map {
    height: 100%;
    width: 100%;
    z-index: 1;
}

/* Map Legend */
.map-legend {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    background: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot-wgs84 { background-color: var(--primary); }
.dot-gcj02 { background-color: var(--success); }
.dot-bd09 { background-color: var(--warning); }

/* Quick Location Selector */
.location-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.location-tag {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.location-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
    background-color: var(--primary-light);
    transform: translateY(-1px);
}

/* Status Indicator Widget */
.status-indicator {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-top: 1rem;
}

.status-label {
    font-size: 0.85rem;
    font-weight: 600;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.status-success {
    background-color: var(--success-light);
    color: var(--success);
}

.status-danger {
    background-color: var(--danger-light);
    color: var(--danger);
}

/* Batch Conversion Styles */
.batch-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .batch-container {
        grid-template-columns: 1fr;
    }
}

.textarea-control {
    width: 100%;
    min-height: 250px;
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-family: monospace;
    outline: none;
    resize: vertical;
    transition: all 0.2s ease;
}

.textarea-control:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.table-wrapper {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface-solid);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    text-align: left;
}

.table th, .table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--bg-app);
    color: var(--text-secondary);
    font-weight: 600;
}

.table tbody tr:hover {
    background-color: var(--primary-light);
}

.table td.font-mono {
    font-family: monospace;
}

.empty-state {
    padding: 3rem;
    text-align: center;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.empty-state i {
    font-size: 2.5rem;
}

/* Reverse Geocode Amap API card style */
.api-key-banner {
    padding: 0.75rem 1rem;
    background-color: var(--primary-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.json-tree {
    background-color: var(--bg-app);
    padding: 1rem;
    border-radius: var(--radius-md);
    font-family: monospace;
    font-size: 0.8rem;
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    white-space: pre-wrap;
    word-break: break-all;
}

/* Toast Notification Styles */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 9999;
}

.toast {
    background-color: var(--bg-surface-solid);
    border-left: 4px solid var(--primary);
    color: var(--text-primary);
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
    min-width: 250px;
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.toast-success { border-left-color: var(--success); }
.toast-error { border-left-color: var(--danger); }

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* API Docs Styles */
.doc-section {
    margin-bottom: 1.5rem;
}

.doc-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.doc-section p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.code-block {
    background-color: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-family: monospace;
    font-size: 0.8rem;
    overflow-x: auto;
    color: var(--text-secondary);
}

/* Footer Styles */
footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    background-color: var(--bg-surface);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: auto;
}

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

footer a:hover {
    text-decoration: underline;
}