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

:root {
    --color-primary: #3b82f6;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-bg: #f9fafb;
    --color-card: #ffffff;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-border: #e5e7eb;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
}

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

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
}

.header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.header p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.form-section {
    background-color: var(--color-card);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: var(--spacing-lg);
}

form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
}

input[type="text"],
textarea {
    display: block;
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

button[type="submit"] {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

button[type="submit"]:hover {
    background-color: #2563eb;
}

button[type="submit"]:active {
    transform: scale(0.98);
}

.todo-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--color-text-light);
    font-style: italic;
}

.todo-item {
    background-color: var(--color-card);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    transition: all 0.2s;
}

.todo-item:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.todo-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 3px;
    cursor: pointer;
    accent-color: var(--color-success);
}

.todo-content {
    flex: 1;
    min-width: 0;
}

.todo-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    word-wrap: break-word;
}

.todo-item.completed .todo-title {
    text-decoration: line-through;
    color: var(--color-text-light);
}

.todo-description {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.todo-meta {
    font-size: 0.8rem;
    color: #9ca3af;
}

.todo-actions {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

/* Keep forms inside actions inline without inline style attributes */
.todo-actions form {
    display: inline-block;
    margin: 0;
}

/* Unified button sizing for Edit and Delete */
button.btn-edit,
button.btn-delete,
.btn-edit,
.btn-delete {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 8px 14px;
    min-height: 36px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 6px;
    box-sizing: border-box;
    font-family: inherit;
    line-height: 1;
    cursor: pointer;
    transition: background-color 0.15s, transform 0.06s;
}

/* Edit (primary) — blue outline */
.btn-edit,
button.btn-edit {
    color: var(--color-primary);
    background: transparent;
    border: 1px solid var(--color-primary);
    text-decoration: none;
}

.btn-edit:hover {
    background-color: rgba(59,130,246,0.08);
    transform: translateY(-1px);
}

/* Delete (danger) — solid red */
.btn-delete,
button.btn-delete {
    color: white;
    background-color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

.btn-delete:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
}

/* Ensure delete buttons (which are submit buttons) do not inherit the general submit hover color */
button.btn-delete:hover,
button[type="submit"].btn-delete:hover {
    background-color: #b91c1c; /* slightly darker red */
    border-color: #991b1b;
    color: #fff;
}

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .todo-item {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .todo-actions {
        width: 100%;
    }
}