/* ============= CSS VARIABLES ============= */
:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #13172e;
    --bg-tertiary: #1a1f3a;
    
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-hover: rgba(255, 255, 255, 0.06);
    
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    
    --accent-blue: #60a5fa;
    --accent-purple: #a78bfa;
    --accent-pink: #f472b6;
    --accent-green: #34d399;
    --accent-yellow: #fbbf24;
    --accent-red: #f87171;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body[data-theme="light"] {
    --bg-primary: #f0f4f8;
    --bg-secondary: #e2e8f0;
    --bg-tertiary: #cbd5e1;
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-hover: rgba(255, 255, 255, 0.9);
    
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
}

/* ============= RESET & BASE ============= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: var(--transition);
    width: 100%;
}

/* Background gradient animation */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(96, 165, 250, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(167, 139, 250, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ============= CONTAINER ============= */
.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    position: relative;
    z-index: 1;
    width: 100%;
}

/* ============= NAVIGATION ============= */
nav {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    width: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
}

.nav-brand:hover {
    opacity: 0.8;
    transform: scale(1.02);
}

.nav-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.9rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-blue);
    background: var(--glass-hover);
}

.theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    background: var(--glass-hover);
    transform: scale(1.05);
    box-shadow: var(--shadow-sm);
}

/* ============= LAYOUT ============= */
.modern-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

@media (max-width: 1200px) {
    .modern-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        order: 2;
    }

    .main-content {
        order: 1;
    }
}

/* ============= SIDEBAR ============= */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 100px;
    width: 100%;
    overflow: hidden;
}

.sidebar-section {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    width: 100%;
    overflow: hidden;
}

.sidebar-section:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-lg);
}

.sidebar-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Period Selector */
.period-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    width: 100%;
}

.period-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.6rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.85rem;
    transition: var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.period-btn.active {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
    width: 100%;
}

.stat-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
    transition: var(--transition);
    overflow: hidden;
}

.stat-card:hover {
    background: var(--glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* Charts */
.chart-wrapper {
    position: relative;
    height: 220px;
    margin-top: 1rem;
    width: 100%;
    overflow: hidden;
}

.chart-wrapper canvas {
    max-width: 100%;
    height: auto !important;
}

.chart-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

/* Top List */
.top-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.top-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    overflow: hidden;
}

.top-item:hover {
    background: var(--glass-hover);
    transform: translateX(4px);
}

.top-rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-red));
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
    color: white;
    flex-shrink: 0;
}

.top-period {
    flex: 1;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.top-count {
    color: var(--accent-green);
    font-weight: 600;
    font-size: 0.85rem;
    flex-shrink: 0;
}

/* ============= MAIN CONTENT ============= */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
    min-width: 0;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    width: 100%;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.add-task-trigger {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    border: none;
    color: white;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-xl);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    box-shadow: 0 4px 16px rgba(96, 165, 250, 0.4);
    transition: var(--transition);
    white-space: nowrap;
}

.add-task-trigger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(96, 165, 250, 0.5);
}

.add-icon {
    font-size: 1.5rem;
    line-height: 1;
}

/* ============= ADD TASK PANEL ============= */
.add-task-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s ease;
    width: 100%;
    overflow: hidden;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
}

.form-grid {
    display: grid;
    gap: 1.25rem;
    width: 100%;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
    min-width: 0;
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    width: 100%;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input,
.form-select,
.form-textarea {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.875rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    transition: var(--transition);
    font-family: inherit;
    width: 100%;
    max-width: 100%;
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    background: var(--glass-hover);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

.subtask-toggle {
    background: transparent;
    border: 2px dashed var(--glass-border);
    color: var(--accent-blue);
    padding: 0.875rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    width: 100%;
}

.subtask-toggle:hover {
    border-color: var(--accent-blue);
    background: rgba(96, 165, 250, 0.05);
}

.subtasks-input {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    width: 100%;
}

#subtasksList {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    width: 100%;
}

.subtask-input {
    background: var(--glass-bg) !important;
    width: 100%;
}

.btn-link {
    background: transparent;
    border: none;
    color: var(--accent-blue);
    padding: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    text-align: left;
}

.btn-link:hover {
    color: var(--accent-purple);
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 1rem;
    padding-top: 0.5rem;
    width: 100%;
}

.btn {
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    flex: 1;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    color: white;
    box-shadow: 0 4px 16px rgba(52, 211, 153, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(52, 211, 153, 0.4);
}

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

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

/* ============= TASKS CONTAINER ============= */
.tasks-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    width: 100%;
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem;
    gap: 1rem;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--glass-border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    gap: 1.5rem;
    width: 100%;
}

.empty-icon {
    font-size: 4rem;
    opacity: 0.5;
}

/* ============= TASK CARD ============= */
.task-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    animation: fadeIn 0.4s ease;
    width: 100%;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent-blue), var(--accent-purple));
    transform: scaleY(0);
    transition: var(--transition);
}

.task-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.task-card:hover::before {
    transform: scaleY(1);
}

.task-card.done {
    opacity: 0.7;
}

.task-card.done .task-title {
    text-decoration: line-through;
    opacity: 0.6;
}

/* Task Card Header */
.task-card-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1.25rem;
    align-items: start;
    width: 100%;
}

.task-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--accent-green);
    margin-top: 2px;
    flex-shrink: 0;
}

.task-info {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

.task-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.task-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.task-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.meta-icon {
    font-size: 1rem;
}

.priority-badge {
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.priority-low {
    background: rgba(52, 211, 153, 0.15);
    color: var(--accent-green);
}

.priority-medium {
    background: rgba(251, 191, 36, 0.15);
    color: var(--accent-yellow);
}

.priority-high {
    background: rgba(248, 113, 113, 0.15);
    color: var(--accent-red);
}

.task-delete {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1.75rem;
    line-height: 1;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
    flex-shrink: 0;
}

.task-delete:hover {
    background: rgba(248, 113, 113, 0.15);
    color: var(--accent-red);
}

/* ============= SUBTASKS ============= */
.subtasks-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
    width: 100%;
}

.subtasks-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    width: 100%;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--glass-bg);
    border-radius: var(--radius-xl);
    overflow: hidden;
    min-width: 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
    border-radius: var(--radius-xl);
    transition: width 0.5s ease;
}

.progress-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-green);
    white-space: nowrap;
    flex-shrink: 0;
}

.subtasks-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    width: 100%;
    overflow: hidden;
}

.subtask-item:hover {
    background: var(--glass-hover);
}

.subtask-item.completed {
    opacity: 0.5;
}

.subtask-item.completed span {
    text-decoration: line-through;
}

.subtask-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-green);
    flex-shrink: 0;
}

.subtask-item span {
    flex: 1;
    color: var(--text-primary);
    font-size: 0.9rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
    min-width: 0;
}

/* ============= AUTH PAGES ============= */
.auth-container {
    max-width: 440px;
    width: 100%;
    margin: 5rem auto;
    padding: 2.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.auth-container h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-container input {
    margin-bottom: 1.25rem;
    width: 100%;
}

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

.auth-link {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

.auth-link a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.auth-link a:hover {
    color: var(--accent-purple);
}

/* ============= UTILITY CLASSES ============= */
.loading,
.empty-message {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.9rem;
    padding: 2rem;
}

/* ============= RESPONSIVE ============= */
@media (max-width: 1200px) {
    .modern-layout {
        grid-template-columns: 1fr;
        padding: 1.5rem;
    }

    .sidebar {
        order: 2;
        position: static;
    }

    .main-content {
        order: 1;
    }
}

@media (max-width: 768px) {
    /* Navigation */
    nav {
        padding: 1rem;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .nav-brand {
        font-size: 1.3rem;
        flex: 1 1 100%;
    }

    .nav-icon {
        width: 28px;
        height: 28px;
    }

    .nav-links {
        flex: 1 1 100%;
        justify-content: center;
        gap: 0.75rem;
        font-size: 0.85rem;
    }

    /* Layout */
    .modern-layout {
        padding: 1rem;
        gap: 1.5rem;
    }

    /* Content Header */
    .content-header {
        flex-direction: column;
        align-items: stretch;
    }

    .page-title {
        font-size: 1.5rem;
        text-align: center;
    }

    .add-task-trigger {
        width: 100%;
        justify-content: center;
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }

    /* Sidebar Sections */
    .sidebar-section {
        padding: 1rem;
    }

    .sidebar-title {
        font-size: 1rem;
    }

    /* Period Selector */
    .period-selector {
        gap: 0.4rem;
    }

    .period-btn {
        padding: 0.5rem 0.25rem;
        font-size: 0.75rem;
    }

    /* Stats Grid */
    .stats-grid {
        gap: 0.75rem;
    }

    .stat-card {
        padding: 1rem;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.7rem;
    }

    /* Charts */
    .chart-wrapper {
        height: 180px;
    }

    /* Add Task Panel */
    .add-task-panel {
        padding: 1.25rem;
    }

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

    .form-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    /* Task Cards */
    .task-card {
        padding: 1.25rem;
    }

    .task-card-header {
        grid-template-columns: auto 1fr;
        gap: 0.75rem;
    }

    .task-title {
        font-size: 1rem;
    }

    .task-description {
        font-size: 0.85rem;
    }

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

    .task-delete {
        position: absolute;
        top: 1rem;
        right: 1rem;
    }

    /* Top List */
    .top-item {
        padding: 0.6rem;
        gap: 0.75rem;
    }

    .top-rank {
        width: 24px;
        height: 24px;
        font-size: 0.75rem;
    }

    .top-period {
        font-size: 0.85rem;
    }

    .top-count {
        font-size: 0.8rem;
    }

    /* Auth Container */
    .auth-container {
        margin: 2rem 1rem;
        padding: 2rem 1.5rem;
        max-width: 100%;
    }

    .auth-container h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    /* Extra small screens */
    nav {
        padding: 0.875rem;
    }

    .nav-brand {
        font-size: 1.1rem;
    }

    .nav-icon {
        width: 24px;
        height: 24px;
    }

    .page-title {
        font-size: 1.3rem;
    }

    .add-task-trigger {
        padding: 0.65rem 1rem;
        font-size: 0.85rem;
    }

    .add-icon {
        font-size: 1.25rem;
    }

    .sidebar-section {
        padding: 0.875rem;
    }

    .period-selector {
        gap: 0.3rem;
    }

    .period-btn {
        padding: 0.45rem 0.2rem;
        font-size: 0.7rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        padding: 0.875rem;
    }

    .chart-wrapper {
        height: 160px;
    }

    .task-card {
        padding: 1rem;
    }

    .task-card-header {
        gap: 0.5rem;
    }

    .task-title {
        font-size: 0.95rem;
    }

    .task-checkbox {
        width: 20px;
        height: 20px;
    }

    .priority-badge {
        padding: 0.25rem 0.65rem;
        font-size: 0.7rem;
    }

    .subtasks-section {
        margin-top: 1rem;
        padding-top: 1rem;
    }

    .subtask-item {
        padding: 0.6rem;
        font-size: 0.85rem;
    }

    .form-input,
    .form-select,
    .form-textarea {
        padding: 0.75rem 0.875rem;
        font-size: 0.9rem;
    }

    .form-textarea {
        min-height: 80px;
    }

    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }

    .auth-container {
        margin: 1.5rem 0.75rem;
        padding: 1.5rem 1rem;
    }

    .modern-layout {
        padding: 0.75rem;
    }
}

/* Landscape orientation on mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .modern-layout {
        grid-template-columns: 1fr 1fr;
    }

    .sidebar {
        order: 1;
    }

    .main-content {
        order: 2;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    /* Increase touch targets */
    .task-checkbox,
    .subtask-item input[type="checkbox"] {
        width: 24px;
        height: 24px;
    }

    .task-delete {
        width: 40px;
        height: 40px;
        font-size: 2rem;
    }

    .period-btn {
        min-height: 44px;
    }

    .add-task-trigger {
        min-height: 48px;
    }

    .btn {
        min-height: 48px;
    }

    .nav-links a {
        padding: 0.6rem 1rem;
    }
}

#priorityChart {
    margin: 20px 0;
    max-width: 100%;
}