/* --- [修改] 基礎佈局與變數 --- */
:root {
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 75px;
    --transition-speed: 0.3s;
}

#wrapper {
    display: flex;
    width: 100%;
    align-items: stretch;
    transition: all var(--transition-speed);
}

/* Sidebar toggler */
#wrapper {
    overflow-x: hidden;
}

#sidebar-wrapper {
    min-height: 100vh;
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    transition: all var(--transition-speed);
    z-index: 1000;
    overflow-x: hidden;
    background: linear-gradient(180deg, #2d3436 0%, #000000 100%) !important;
}

/* 桌機版收合狀態 - 只顯示 Icon */
#wrapper.collapsed-sidebar #sidebar-wrapper {
    min-width: var(--sidebar-collapsed-width);
    max-width: var(--sidebar-collapsed-width);
}

#wrapper.collapsed-sidebar #sidebar-wrapper .sidebar-heading span,
#wrapper.collapsed-sidebar #sidebar-wrapper .list-group-item span {
    display: none; /* 隱藏文字 */
}

#wrapper.collapsed-sidebar #sidebar-wrapper .sidebar-heading {
    text-align: center;
    padding: 1.5rem 0;
}

#wrapper.collapsed-sidebar #sidebar-wrapper .list-group-item {
    text-align: center;
    padding: 1rem 0;
}

#sidebar-wrapper .sidebar-heading {
    padding: 1.5rem 1.25rem;
    font-size: 1.2rem;
    white-space: nowrap;
}

#sidebar-wrapper .list-group-item {
    padding: 1rem 1.25rem;
    font-size: 1.05rem;
    border: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

#sidebar-wrapper .list-group-item i {
    width: 20px;
    text-align: center;
}

#sidebar-wrapper .list-group-item:hover,
#sidebar-wrapper .list-group-item.active {
    background-color: rgba(255, 255, 255, 0.1) !important;
    border-left: 4px solid #6C5CE7;
    color: #fff !important;
}

#page-content-wrapper {
    flex-grow: 1;
    min-width: 0;
    width: 100%;
}

/* --- [手機版特有樣式] --- */
@media (max-width: 767.98px) {
    #sidebar-wrapper {
        position: fixed;
        margin-left: calc(-1 * var(--sidebar-width));
    }

    #wrapper.toggled #sidebar-wrapper {
        margin-left: 0;
    }

    /* 手機版遮罩 Overlay */
    .sidebar-overlay {
        display: none;
        position: fixed;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        top: 0;
        left: 0;
        backdrop-filter: blur(2px);
    }

    #wrapper.toggled .sidebar-overlay {
        display: block;
    }

    /* 防止滾動穿透 */
    body.sidebar-open {
        overflow: hidden;
    }
}

/* 桌機版預設顯示校正 */
@media (min-width: 768px) {
    #sidebar-wrapper {
        margin-left: 0 !important;
    }
}

/* Custom Component Colors */
.bg-primary { background-color: #6C5CE7 !important; }
.text-primary { color: #6C5CE7 !important; }
.btn-primary { 
    background-color: #6C5CE7; 
    border-color: #6C5CE7;
}
.btn-primary:hover {
    background-color: #5548c8; 
    border-color: #5548c8;
}

/* Cards & Shadows */
.card {
    border-radius: 12px;
}
.quiz-card {
    border-radius: 20px;
}
.result-card {
    border-radius: 20px;
    background-image: linear-gradient(45deg, rgba(255,255,255,0.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.15) 50%, rgba(255,255,255,0.15) 75%, transparent 75%, transparent);
    background-size: 1rem 1rem;
}

/* Quiz Buttons */
.quiz-btn {
    border-width: 2px;
    border-radius: 12px;
    transition: all 0.2s ease-in-out;
}
.quiz-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* Misc Utilities */
.min-vh-50 { min-height: 50vh; }