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

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px 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);
    
    --status-todo: #94a3b8;
    --status-in-progress: #3b82f6;
    --status-in-approval: #f59e0b;
    --status-done: #10b981;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    margin: 1rem;
}

.login-box h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    text-align: center;
    color: var(--text-primary);
}

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

.login-hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.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: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

/* Buttons */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

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

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

.btn-secondary:hover {
    background-color: #475569;
}

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

.btn-success:hover {
    background-color: #059669;
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    border-radius: 0.25rem;
    transition: all 0.2s;
}

.btn-icon:hover {
    color: var(--danger-color);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Admin Container */
.admin-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.admin-header {
    background: var(--surface);
    padding: 1.25rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header h1 {
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

.admin-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 1.5rem;
    overflow-y: auto;
}

.sidebar h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.project-item {
    padding: 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.5rem;
    border: 1px solid transparent;
}

.project-item:hover {
    background-color: var(--background);
}

.project-item.active {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: var(--primary-color);
}

.project-item h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.project-item small {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.no-projects {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-align: center;
    padding: 2rem 0;
}

/* Main Content */
.main-content {
    padding: 2rem;
    overflow-y: auto;
}

.project-header {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.project-info h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.project-info p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.project-dates {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.project-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

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

.view-tabs {
    display: flex;
    gap: 0.5rem;
    background: var(--surface);
    padding: 0.25rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.tab-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: none;
    border-radius: 0.375rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

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

.tab-btn:hover:not(.active) {
    background-color: var(--background);
}

.task-controls {
    display: flex;
    gap: 0.5rem;
}

/* Task Groups */
.task-group {
    background: var(--surface);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border);
}

.group-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.tasks-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.no-tasks {
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: 1rem;
    text-align: center;
}

/* Task Cards */
.task-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.client-task-card {
    cursor: default;
}

.client-task-card:hover {
    transform: none;
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.task-header h4 {
    font-size: 1rem;
    flex: 1;
}

.task-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.task-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.task-dates {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Status Badges */
.status-badge {
    padding: 0.25rem 0.625rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.status-to-do {
    background-color: rgba(148, 163, 184, 0.2);
    color: var(--status-todo);
}

.status-in-progress {
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--status-in-progress);
}

.status-in-approval {
    background-color: rgba(245, 158, 11, 0.2);
    color: var(--status-in-approval);
}

.status-done {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--status-done);
}

/* Timeline View */
.timeline {
    background: var(--surface);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.timeline-calendar-header {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding-bottom: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border);
    align-items: flex-end;
}

.timeline-label {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1rem;
    letter-spacing: 0.025em;
}

.timeline-calendar-grid {
    position: relative;
    height: 60px;
    background: linear-gradient(to bottom, rgba(59, 130, 246, 0.03) 0%, transparent 100%);
    border-radius: 0.5rem;
}

.calendar-marker {
    position: absolute;
    top: 0;
    bottom: 0;
    transform: translateX(-50%);
}

.calendar-marker-line {
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color) 0%, rgba(59, 130, 246, 0.2) 100%);
    margin: 0 auto;
}

.calendar-marker-label {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--surface);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    white-space: nowrap;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.125rem;
}

.calendar-marker-badge {
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    color: var(--surface);
    background: var(--primary-color);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    box-shadow: 0 1px 2px rgba(59, 130, 246, 0.3);
}

.timeline-group-separator {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
    padding: 1rem 1.5rem;
    margin: 2rem -1.5rem 0.5rem -1.5rem;
    border-left: 4px solid var(--primary-color);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(59, 130, 246, 0.02) 100%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    position: relative;
}

.timeline-group-separator:first-of-type {
    margin-top: 0;
}

.timeline-group-info {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.timeline-group-name {
    font-weight: 700;
    font-size: 1rem;
    color: var(--primary-color);
    letter-spacing: 0.015em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.timeline-group-name .btn-icon {
    opacity: 0;
    transition: opacity 0.2s;
}

.timeline-group-separator:hover .timeline-group-name .btn-icon {
    opacity: 1;
}

.timeline-group-dates {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.timeline-group-dates::before {
    content: '📋';
    font-size: 0.875rem;
}

.timeline-group-bar-wrapper {
    position: relative;
    height: 2.75rem;
    display: flex;
    align-items: center;
}

.timeline-group-bar-container {
    position: relative;
    width: 100%;
    height: 4px;
}

.timeline-group-bar {
    position: absolute;
    height: 100%;
    background: var(--primary-color);
    box-shadow: 0 1px 3px rgba(59, 130, 246, 0.3);
    border-radius: 2px;
}

.timeline-row {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
    padding: 0.875rem 1.5rem;
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    cursor: pointer;
    transition: all 0.2s;
    margin: 0 -1.5rem;
    position: relative;
    align-items: center;
}

.timeline-row:hover {
    background-color: rgba(59, 130, 246, 0.03);
}

.timeline-row::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: transparent;
    transition: background 0.2s;
}

.timeline-row:hover::before {
    background: var(--primary-color);
}

.timeline-task-info {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    padding-right: 1rem;
}

.timeline-task-info strong {
    font-size: 0.9375rem;
    color: var(--text-primary);
    line-height: 1.3;
    font-weight: 600;
}

.timeline-task-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.timeline-task-dates {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.timeline-task-dates::before {
    content: '📅';
    font-size: 0.875rem;
}

.timeline-task-duration {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.timeline-bar-wrapper {
    position: relative;
}

.timeline-bar-container {
    position: relative;
    height: 2.5rem;
    background: repeating-linear-gradient(
        90deg,
        rgba(226, 232, 240, 0.25) 0px,
        rgba(226, 232, 240, 0.25) calc(100% / 30 - 1px),
        rgba(226, 232, 240, 0.5) calc(100% / 30 - 1px),
        rgba(226, 232, 240, 0.5) calc(100% / 30)
    );
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.timeline-bar {
    position: absolute;
    height: 100%;
    border-radius: 0.5rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.timeline-row:hover .timeline-bar {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.timeline-bar.status-to-do {
    background: linear-gradient(135deg, var(--status-todo) 0%, #7c8fa8 100%);
}

.timeline-bar.status-in-progress {
    background: linear-gradient(135deg, var(--status-in-progress) 0%, #2563eb 100%);
}

.timeline-bar.status-in-approval {
    background: linear-gradient(135deg, var(--status-in-approval) 0%, #d97706 100%);
}

.timeline-bar.status-done {
    background: linear-gradient(135deg, var(--status-done) 0%, #059669 100%);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    margin: 1rem;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content h2 {
    margin-bottom: 1.5rem;
}

/* Client Page */
.client-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.client-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 2rem;
    border-radius: 1rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

.client-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.project-goal {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.project-timeline {
    display: flex;
    gap: 0.75rem;
    font-size: 0.875rem;
    opacity: 0.9;
}

.client-view-controls {
    justify-content: center;
    margin-bottom: 2rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state h2 {
    margin-bottom: 0.5rem;
}

/* Error Page */
.error-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background);
}

.error-box {
    background: var(--surface);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 500px;
    margin: 1rem;
}

.error-box h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--danger-color);
}

.error-box p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.error-hint {
    font-size: 0.875rem;
    margin-top: 1rem !important;
}

.error-message {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .admin-content {
        grid-template-columns: 220px 1fr;
    }
    
    .tasks-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .admin-content {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
        max-height: 200px;
    }
    
    .project-header {
        padding: 1.5rem;
    }
    
    .project-actions {
        flex-direction: column;
    }
    
    .view-controls {
        flex-direction: column;
        gap: 1rem;
    }
    
    .timeline-calendar-header {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .timeline-group-separator {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        padding: 1rem;
    }
    
    .timeline-group-name {
        font-size: 0.9375rem;
    }
    
    .timeline-group-dates {
        font-size: 0.75rem;
    }
    
    .timeline-group-bar-wrapper {
        height: 2rem;
    }
    
    .timeline-group-bar-container {
        height: 4px;
    }
    
    .timeline-row {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        padding: 1rem 1rem;
    }
    
    .timeline-calendar-grid {
        height: 50px;
    }
    
    .timeline-task-info {
        padding-right: 0;
    }
    
    .timeline-task-info strong {
        font-size: 0.875rem;
    }
    
    .timeline-task-dates {
        font-size: 0.75rem;
    }
    
    .timeline-task-duration {
        font-size: 0.7rem;
    }
    
    .calendar-marker-label {
        font-size: 0.65rem;
        padding: 0.2rem 0.4rem;
    }
    
    .timeline-bar-container {
        height: 2rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .client-header h1 {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .main-content,
    .client-container {
        padding: 1rem;
    }
    
    .admin-header {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-actions {
        width: 100%;
        justify-content: stretch;
    }
    
    .header-actions .btn {
        flex: 1;
    }
    
    .task-controls {
        width: 100%;
        flex-direction: column;
    }
    
    .timeline {
        padding: 1rem;
    }
    
    .timeline-task-dates::before {
        content: '';
    }
    
    .timeline-group-dates::before {
        content: '';
    }
    
    .calendar-marker-label {
        font-size: 0.6rem;
        padding: 0.15rem 0.35rem;
    }
}