/* --- Global & Layout --- */
:root {
    --color-bg: #FFFFFF;
    --color-bg-alt: #FAFAFA;
    --color-border: #EEEEEE;
    --color-text: #202020;
    --color-text-alt: #808080;
    --color-accent: #DB4C3F;
    --color-danger: #DB4C3F;
    --color-selection: #BBDEFB; /* Changed from Yellow to Light Blue */
    --color-bg-collapsed: #F9F9F9;
    --indent-size: 24px;

    /* --- NEW: Subtask Count Colors --- */
    --color-green-1: #C8E6C9; /* 1-2 */
    --color-green-2: #A5D6A7; /* 3-4 */
    --color-green-3: #81C784; /* 5-6 */
    --color-green-4: #66BB6A; /* 7-8 */
    --color-green-5: #4CAF50; /* 9-10+ */
    --color-blue-1: #BBDEFB; /* 1-2 */
    --color-blue-2: #90CAF9; /* 3-4 */
    --color-blue-3: #64B5F6; /* 5-6 */
    --color-blue-4: #42A5F5; /* 7-8 */
    --color-blue-5: #2196F3; /* 9-10+ */
    /* --- END NEW --- */
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    overscroll-behavior-y: contain;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

button {
    cursor: pointer;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg-alt);
    padding: 6px 12px;
    border-radius: 5px;
    font-weight: 500;
}

button:hover {
    background-color: var(--color-border);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
    background-color: var(--color-bg-alt);
}

.error-banner {
    display: none;
    background-color: #FFF0F0;
    color: var(--color-danger);
    padding: 8px 10px;
    text-align: center;
    font-weight: 500;
    border-bottom: 1px solid var(--color-danger);
}