:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #131316;
    --bg-card: #1a1a1f;
    --bg-card-hover: #222228;
    --border-color: #2a2a32;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --header-color: #3b82f6;
    --payload-color: #22c55e;
    --signature-color: #f97316;
    --error-color: #ef4444;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --radius: 12px;
    --radius-sm: 8px;
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo svg {
    color: var(--accent);
}

.controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
}

.sun-icon { display: none; }
.moon-icon { display: block; }

[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

.lang-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
}

.lang-select:focus {
    border-color: var(--accent);
}

/* Main Content */
.main {
    flex: 1;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.bento-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.card-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Input Card */
.input-card {
    grid-column: 1;
}

.jwt-input {
    width: 100%;
    height: 120px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.875rem;
    resize: vertical;
    outline: none;
    transition: border-color 0.2s ease;
}

.jwt-input:focus {
    border-color: var(--accent);
}

.jwt-input::placeholder {
    color: var(--text-muted);
}

.input-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.action-btn {
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
}

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

.action-btn.primary:hover {
    background: var(--accent-hover);
}

.clear-btn {
    padding: 6px 12px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: color 0.2s ease;
}

.clear-btn:hover {
    color: var(--error-color);
}

/* Output Card */
.output-card {
    grid-column: 2;
    grid-row: 1 / 3;
}

.expiry-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.expiry-badge.valid {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success-color);
}

.expiry-badge.expired {
    background: rgba(239, 68, 68, 0.15);
    color: var(--error-color);
}

.expiry-badge.pending {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning-color);
}

.expiry-status::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-right: 6px;
}

.expiry-badge.valid .expiry-status::before {
    background: var(--success-color);
}

.expiry-badge.expired .expiry-status::before {
    background: var(--error-color);
}

.expiry-badge.pending .expiry-status::before {
    background: var(--warning-color);
}

.decoded-sections {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.decoded-section {
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.header-section .section-label { color: var(--header-color); }
.payload-section .section-label { color: var(--payload-color); }
.signature-section .section-label { color: var(--signature-color); }

.code-output {
    padding: 12px;
    margin: 0;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.8125rem;
    line-height: 1.5;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 150px;
    overflow-y: auto;
}

.header-color {
    background: rgba(59, 130, 246, 0.08);
    color: var(--header-color);
}

.payload-color {
    background: rgba(34, 197, 94, 0.08);
    color: var(--payload-color);
}

.signature-color {
    background: rgba(249, 115, 22, 0.08);
    color: var(--signature-color);
}

.raw-json {
    background: var(--bg-secondary);
    color: var(--text-primary);
    max-height: 200px;
}

.copy-btn {
    padding: 4px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.6875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

/* Claims Info */
.claims-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.claim-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.claim-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.claim-value {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Raw Card */
.raw-card {
    grid-column: 1;
}

/* Info Card */
.info-card {
    grid-column: 2;
}

.info-card h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.info-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.algorithm-info h4 {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.algo-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.algo-tag {
    padding: 4px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: 'Monaco', 'Menlo', monospace;
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Empty State */
.empty-state {
    color: var(--text-muted);
    font-style: italic;
}

/* Responsive */
@media (max-width: 900px) {
    .bento-grid {
        grid-template-columns: 1fr;
    }
    
    .input-card,
    .output-card,
    .raw-card,
    .info-card {
        grid-column: 1;
        grid-row: auto;
    }
    
    .output-card {
        grid-row: span 1;
    }
    
    .claims-info {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .app {
        padding: 12px;
    }
    
    .header {
        flex-direction: column;
        gap: 12px;
        padding: 12px 16px;
    }
    
    .bento-card {
        padding: 16px;
    }
    
    .input-actions {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
    }
}