:root {
    --primary-color: #5865F2;
    --secondary-color: #4752C4;
    --success-color: #57F287;
    --danger-color: #ED4245;
    --warning-color: #FEE75C;
    --bg-primary: #f0f0f5;
    --bg-secondary: #ffffff;
    --text-primary: #2c2c2c;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

[data-theme="dark"] {
    --primary-color: #5865F2;
    --secondary-color: #4752C4;
    --success-color: #57F287;
    --danger-color: #ED4245;
    --warning-color: #FEE75C;
    --bg-primary: #1e1e2e;
    --bg-secondary: #2a2a3e;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #3a3a4e;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
}

.header-right {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.user-info {
    font-weight: 500;
}

@media (max-width: 768px) {
    .header {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
    }

    .logo {
        font-size: 1.5rem;
    }

    .header-right {
        gap: 0.5rem;
        width: 100%;
        justify-content: flex-end;
        margin-top: 0.5rem;
    }

    .user-info {
        width: 100%;
        text-align: right;
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }

    .header-right .btn {
        font-size: 0.85rem;
        padding: 0.4rem 0.8rem;
    }

    /* Hide text on mobile, show only icons */
    .header-right .btn:not(#logoutBtn) {
        padding: 0.5rem;
        min-width: 40px;
    }

    #changeMyPasswordBtn::before {
        content: '🔑';
    }

    #changeMyPasswordBtn {
        font-size: 0;
    }

    #changeMyPasswordBtn::before {
        font-size: 1.2rem;
    }

    #telegramBtn::before {
        content: '📱';
    }

    #telegramBtn {
        font-size: 0;
    }

    #telegramBtn::before {
        font-size: 1.2rem;
    }

    #themeToggle::before {
        content: '🌓';
    }

    #themeToggle {
        font-size: 0;
    }

    #themeToggle::before {
        font-size: 1.2rem;
    }
}

/* Main Layout */
.main-container {
    display: flex;
    min-height: calc(100vh - 70px);
}

.sidebar {
    width: 300px;
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    overflow-y: auto;
}

.content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

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

.content-actions {
    display: flex;
    gap: 1rem;
}

/* Sidebar */
.sidebar-section {
    margin-bottom: 2rem;
}

.sidebar-section h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-transform: uppercase;
}

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

.project-item {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background-color: var(--bg-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.project-item:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

.project-item.active {
    background-color: var(--primary-color);
    color: white;
}

/* Categories */
.categories-container {
    display: grid;
    gap: 2rem;
}

.category-section {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.category-title {
    font-size: 1.3rem;
    font-weight: 600;
}

.category-count {
    background-color: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

.tasks-list {
    display: grid;
    gap: 1rem;
}

.task-card {
    background-color: var(--bg-primary);
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    border-left: 4px solid var(--primary-color);
}

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

.task-card.priority-urgent {
    border-left-color: var(--danger-color);
}

.task-card.priority-high {
    border-left-color: var(--warning-color);
}

.task-card.priority-low {
    border-left-color: var(--text-secondary);
}

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

.task-title {
    font-weight: 600;
    font-size: 1.1rem;
    flex: 1;
}

.task-status {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.task-status.pending {
    background-color: var(--text-secondary);
    color: white;
}

.task-status.in_progress {
    background-color: var(--primary-color);
    color: white;
}

.task-status.completed {
    background-color: var(--success-color);
    color: black;
}

.task-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.task-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
}

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

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

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

.btn-success:hover {
    opacity: 0.9;
}

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

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

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

.btn-outline {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline:hover {
    background-color: rgba(255,255,255,0.1);
}

.btn-block {
    width: 100%;
    margin-top: 0.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group small {
    display: block;
    margin-top: 0.3rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

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

.input-group {
    display: flex;
    gap: 0.5rem;
}

.input-group input {
    flex: 1;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.6);
    z-index: 1000;
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    position: relative;
}

.modal-content.modal-large {
    max-width: 900px;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

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

/* Login Page */
.login-page {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-box {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    text-align: center;
}

.login-box .logo {
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.login-footer {
    margin-top: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.error-message {
    color: var(--danger-color);
    margin-top: 1rem;
    font-size: 0.9rem;
}

.logout-message {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background-color: var(--success-color);
    color: black;
    padding: 1rem 2rem;
    border-radius: 8px;
    display: none;
    box-shadow: var(--shadow);
}

.logout-message.show {
    display: block;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.admin-content {
    min-height: 400px;
}

/* Responsive */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: 1rem;
    }

    .content {
        padding: 1rem;
    }

    .content-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .content-actions {
        width: 100%;
        flex-direction: column;
    }

    .content-actions button {
        width: 100%;
    }

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

    .modal-content {
        width: 95%;
        padding: 1.5rem;
        max-height: 85vh;
    }

    .task-card {
        padding: 0.75rem;
    }

    .task-meta {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }

    .category-section {
        padding: 1rem;
    }

    /* Make buttons more touch-friendly */
    .btn {
        min-height: 44px;
        touch-action: manipulation;
    }

    /* Improve form inputs on mobile */
    input, textarea, select {
        font-size: 16px !important; /* Prevent zoom on iOS */
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.hidden {
    display: none;
}