:root {
    --color-primary: #4A90E2;
    --color-primary-dark: #357ABD;
    --color-secondary: #7B8A9A;
    --color-success: #52C41A;
    --color-danger: #FF4D4F;
    --color-warning: #FAAD14;
    
    --bg-light: #F4F7F9;
    --bg-white: #FFFFFF;
    --bg-card: #FFFFFF;
    --text-primary: #1A202C;
    --text-secondary: #718096;
    --border-color: #E2E8F0;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    --radius: 8px;
    --spacing: 1rem;
}

.dark-mode {
    --bg-light: #1A202C;
    --bg-white: #2D3748;
    --bg-card: #2D3748;
    --text-primary: #F7FAFC;
    --text-secondary: #A0AEC0;
    --border-color: #4A5568;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing);
}

/* Navigation */
.navbar {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo a {
    text-decoration: none;
    color: inherit;
}

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

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
}

.btn-primary.running {
    background-color: var(--color-danger);
}

.btn-primary.running:hover {
    background-color: #E63946;
}

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

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

.btn-google {
    background-color: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    width: 100%;
}

.btn-google:hover {
    background-color: var(--bg-light);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius);
}

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

/* Cards */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing);
    border: 1px solid var(--border-color);
}

.auth-card {
    max-width: 400px;
    margin: 4rem auto;
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.auth-card h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    background-color: var(--bg-white);
    color: var(--text-primary);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background-color: var(--border-color);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.divider span {
    background-color: var(--bg-card);
    padding: 0 1rem;
    color: var(--text-secondary);
}

.auth-link {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.auth-link a {
    color: var(--color-primary);
    text-decoration: none;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Dashboard */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing);
}

.project-card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.project-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.project-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
    background-color: var(--bg-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-badge.stopped {
    background-color: var(--bg-light);
    color: var(--text-secondary);
}

.status-badge.running {
    background-color: var(--color-danger);
    color: white;
}

.status-badge.completed {
    background-color: var(--color-success);
    color: white;
}

.status-badge.error {
    background-color: var(--color-warning);
    color: white;
}

/* Project Page */
.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.project-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing);
}

.project-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    font-weight: 600;
    color: var(--color-primary);
}

/* Upload Areas */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 1rem;
}

.upload-area:hover {
    border-color: var(--color-primary);
    background-color: var(--bg-light);
}

.upload-area.dragover {
    border-color: var(--color-primary);
    background-color: var(--bg-light);
}

.document-list {
    margin-bottom: 1rem;
}

.document-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background-color: var(--bg-light);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
}

.document-item span {
    color: var(--text-primary);
    font-size: 0.875rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

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

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .project-layout {
        grid-template-columns: 1fr;
    }
    
    .project-header {
        flex-direction: column;
    }
    
    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.error-message {
    background-color: var(--color-danger);
    color: white;
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.success-message {
    background-color: var(--color-success);
    color: white;
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}