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

:root {
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-elevated: #222222;
    --color-border-primary: #2a2a2a;
    --color-border-secondary: #333333;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a3a3a3;
    --color-text-tertiary: #737373;
    --color-accent-primary: #0ea5e9;
    --color-accent-secondary: #0284c7;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
}

body {
    font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    font-feature-settings: 'rlig' 1, 'calt' 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-primary);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.header-content {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.brand-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.025em;
}

.brand-subtitle {
    font-size: 14px;
    color: var(--color-text-tertiary);
    font-weight: 400;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.main {
    flex: 1;
    padding: 24px;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

.workspace {
    display: grid;
    grid-template-columns: 320px 1fr 420px;
    gap: 24px;
    height: calc(100vh - 112px);
    min-height: 600px;
}

.sidebar,
.generator-panel,
.preview-panel {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 24px;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.templates-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.template-card {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.template-card:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-border-secondary);
    transform: translateY(-1px);
}

.template-icon {
    font-size: 20px;
    opacity: 0.8;
}

.template-card span {
    font-size: 12px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.recent-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.recent-list {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-state {
    color: var(--color-text-tertiary);
    font-size: 14px;
    text-align: center;
}

.recent-item {
    padding: 12px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 8px;
}

.recent-item:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-border-secondary);
}

.recent-type {
    font-size: 11px;
    color: var(--color-accent-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.recent-content {
    font-size: 13px;
    color: var(--color-text-primary);
    margin-bottom: 4px;
    line-height: 1.4;
}

.recent-date {
    font-size: 11px;
    color: var(--color-text-tertiary);
}

.content {
    display: flex;
    flex-direction: column;
}

.generator-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 24px 24px 0;
    border-bottom: 1px solid var(--color-border-primary);
}

.type-tabs {
    display: flex;
    gap: 2px;
    background: var(--color-bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.tab-btn {
    flex: 1;
    padding: 8px 16px;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    background: var(--color-accent-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.panel-body {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    max-height: calc(100vh - 200px);
}

.input-section {
    margin-bottom: 32px;
}

.input-group {
    display: none;
}

.input-group.active {
    display: block;
}

.input-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.input-group input,
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-fast);
    margin-bottom: 16px;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgb(14 165 233 / 0.1);
}

.input-group textarea {
    resize: vertical;
    font-family: inherit;
}

.input-hint {
    font-size: 12px;
    color: var(--color-text-tertiary);
    margin-top: -12px;
    margin-bottom: 16px;
}

.vcard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.customization-section {
    border-top: 1px solid var(--color-border-primary);
    padding-top: 24px;
    margin-bottom: 32px;
}

.custom-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.custom-group label {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.custom-group select {
    width: 100%;
    padding: 8px 12px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a3a3a3' stroke-width='2'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 16px;
    padding-right: 32px;
}

.custom-group select:hover {
    border-color: var(--color-border-secondary);
    background-color: var(--color-bg-elevated);
}

.custom-group select:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.custom-group select option {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    padding: 8px 12px;
}

.actions {
    border-top: 1px solid var(--color-border-primary);
    padding-top: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent-primary);
    color: white;
    width: 100%;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-accent-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
    background: var(--color-bg-elevated);
    color: var(--color-text-tertiary);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-primary);
}

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

.btn-icon {
    padding: 8px;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-primary);
}

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

.preview-panel {
    display: flex;
    flex-direction: column;
}

.preview-header {
    padding: 24px 24px 16px;
    border-bottom: 1px solid var(--color-border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.preview-actions {
    display: flex;
    gap: 8px;
}

.preview-content {
    flex: 1;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.qr-preview {
    width: 100%;
    height: 320px;
    background: var(--color-bg-tertiary);
    border: 2px dashed var(--color-border-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.qr-preview.has-qr {
    border: 2px solid var(--color-accent-primary);
    background: white;
}

.preview-placeholder {
    text-align: center;
    color: var(--color-text-tertiary);
}

.placeholder-icon {
    margin-bottom: 12px;
    opacity: 0.6;
}

.preview-placeholder p {
    font-size: 14px;
    margin-bottom: 8px;
}

.preview-placeholder small {
    font-size: 12px;
    color: var(--color-text-tertiary);
    opacity: 0.7;
}

.qr-preview canvas,
.qr-preview img {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-md);
}

.preview-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-primary);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-label {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.info-value {
    font-size: 13px;
    color: var(--color-text-primary);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
}

.download-actions {
    display: flex;
    gap: 12px;
}

.download-actions .btn {
    flex: 1;
}

.notification {
    position: fixed;
    top: 24px;
    right: 24px;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: white;
    transform: translateX(400px);
    transition: transform var(--transition-normal);
    z-index: 1000;
    min-width: 300px;
    box-shadow: var(--shadow-lg);
}

.notification.show {
    transform: translateX(0);
}

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

.notification.error {
    background: var(--color-error);
}

.notification.warning {
    background: var(--color-warning);
}

.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

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

@media (max-width: 1200px) {
    .workspace {
        grid-template-columns: 1fr 350px;
        gap: 16px;
    }
    
    .sidebar {
        position: fixed;
        top: 64px;
        left: 0;
        height: calc(100vh - 64px);
        width: 300px;
        z-index: 200;
        background: var(--color-bg-secondary);
        border-right: 1px solid var(--color-border-primary);
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 199;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .sidebar-overlay.show {
        opacity: 1;
        visibility: visible;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0 16px;
    }
    
    .main {
        padding: 16px;
    }
    
    .workspace {
        grid-template-columns: 1fr;
        gap: 16px;
        height: auto;
    }
    
    .generator-panel,
    .preview-panel {
        height: auto;
    }
    
    .type-tabs {
        flex-wrap: wrap;
    }
    
    .custom-grid,
    .vcard-grid {
        grid-template-columns: 1fr;
    }
    
    .download-actions {
        flex-direction: column;
    }
    
    .header-actions {
        gap: 4px;
    }
    
    .header-actions .btn {
        padding: 8px 12px;
        font-size: 13px;
    }
    
    .brand {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

@media (max-width: 480px) {
    .main {
        padding: 12px;
    }
    
    .panel-body,
    .preview-content {
        padding: 16px;
    }
    
    .notification {
        right: 12px;
        left: 12px;
        transform: translateY(-100px);
        min-width: auto;
    }
    
    .notification.show {
        transform: translateY(0);
    }
}