/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    padding: 30px 0;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Content */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    margin-bottom: 0;
}

.task-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: var(--background);
    padding: 4px 12px;
    border-radius: 20px;
}

/* Form Styles */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

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

input[type="text"],
input[type="number"],
input[type="time"],
select {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--card-bg);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.checkbox-group {
    margin-bottom: 16px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-weight: normal;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-group span {
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-shuffle {
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    color: white;
    flex: 1;
    font-size: 1.1rem;
    padding: 14px 28px;
}

.btn-shuffle:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-shuffle:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--background);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

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

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

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

.btn-small {
    padding: 8px 16px;
    font-size: 0.875rem;
    background: var(--background);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

.shuffle-controls {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.shuffle-icon {
    font-size: 1.2rem;
}

/* Task Actions */
.task-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

/* Tasks Container */
.tasks-container {
    min-height: 100px;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 20px;
    background: var(--background);
    border-radius: var(--radius-sm);
}

/* Task Item */
.task-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    background: var(--background);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.task-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.task-priority-indicator {
    width: 4px;
    height: 40px;
    border-radius: 2px;
    flex-shrink: 0;
}

.priority-high {
    background: var(--danger-color);
}

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

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

.task-info {
    flex: 1;
    min-width: 0;
}

.task-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.task-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.task-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.task-badges {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-category {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.badge-fixed {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

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

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: background 0.2s;
}

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

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

/* Schedule Styles */
.schedule-container {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.schedule-item {
    display: flex;
    align-items: stretch;
    background: var(--background);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: transform 0.2s;
}

.schedule-item:hover {
    transform: scale(1.01);
}

.schedule-time {
    width: 100px;
    padding: 14px;
    background: var(--primary-color);
    color: white;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.schedule-time .start {
    font-size: 1rem;
}

.schedule-time .end {
    font-size: 0.75rem;
    opacity: 0.8;
}

.schedule-details {
    flex: 1;
    padding: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.schedule-task-name {
    font-weight: 600;
    color: var(--text-primary);
}

.schedule-duration {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Category Colors for Schedule */
.schedule-item[data-category="health"] .schedule-time {
    background: #10b981;
}

.schedule-item[data-category="work"] .schedule-time {
    background: #3b82f6;
}

.schedule-item[data-category="personal"] .schedule-time {
    background: #8b5cf6;
}

.schedule-item[data-category="leisure"] .schedule-time {
    background: #f59e0b;
}

.schedule-item[data-category="chores"] .schedule-time {
    background: #64748b;
}

.schedule-item[data-category="learning"] .schedule-time {
    background: #ec4899;
}

/* Schedule Summary */
.schedule-summary {
    margin-top: 20px;
    padding: 16px;
    background: var(--background);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 16px;
}

.summary-item {
    text-align: center;
}

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

.summary-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    margin-top: auto;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--primary-color);
}

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

.task-item,
.schedule-item {
    animation: fadeIn 0.3s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* Responsive Design */
@media (max-width: 600px) {
    .app-container {
        padding: 12px;
    }

    header {
        padding: 20px 0;
    }

    .logo-container {
        flex-direction: column;
        gap: 8px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .card {
        padding: 16px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .shuffle-controls {
        flex-direction: column;
    }

    .task-item {
        flex-wrap: wrap;
    }

    .task-badges {
        width: 100%;
        margin-top: 8px;
        padding-left: 16px;
    }

    .task-actions-btns {
        width: 100%;
        justify-content: flex-end;
        padding-left: 16px;
    }

    .schedule-time {
        width: 80px;
        padding: 10px;
    }

    .schedule-time .start {
        font-size: 0.9rem;
    }

    .schedule-details {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .schedule-summary {
        flex-direction: column;
        gap: 12px;
    }

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

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #0f172a;
        --card-bg: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --border-color: #334155;
    }

    input[type="text"],
    input[type="number"],
    input[type="time"],
    select {
        background: var(--background);
        color: var(--text-primary);
    }

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

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

    .btn-small {
        background: var(--card-bg);
        color: var(--text-secondary);
    }

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