/* ==========================================================================
   EduGame Guide — Modern Stylesheet
   ========================================================================== */

/* --- Design Tokens --- */
:root {
    --primary: #ff8200;
    --primary-light: #fff0e0;
    --primary-hover: #e67400;
    --secondary: #1e3155;
    --secondary-light: #2a4470;
    --secondary-lighter: #e8edf4;

    --bg-body: #f4f6fa;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;

    --text-primary: #1a1d26;
    --text-secondary: #5a6478;
    --text-muted: #8c95a8;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --shadow-sm: 0 1px 3px rgba(30, 49, 85, 0.06);
    --shadow-md: 0 4px 12px rgba(30, 49, 85, 0.08);
    --shadow-lg: 0 8px 30px rgba(30, 49, 85, 0.1);
    --shadow-glow: 0 4px 20px rgba(255, 130, 0, 0.15);

    --navbar-h: 64px;
    --sidebar-w: 280px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Navbar --- */
.theme-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--navbar-h);
    background: var(--secondary);
    backdrop-filter: blur(12px);
    border-bottom: none;
    display: flex;
    align-items: center;
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0 24px;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #fff;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    border-radius: var(--radius-sm);
    font-size: 18px;
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: #fff;
}

.logo-highlight {
    color: var(--primary);
}

.navbar-actions {
    display: flex;
    align-items: center;
}

.navbar-back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.navbar-back-link:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

/* --- App Layout --- */
.app-layout {
    display: flex;
    padding-top: var(--navbar-h);
    min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    position: fixed;
    top: var(--navbar-h);
    left: 0;
    bottom: 0;
    width: var(--sidebar-w);
    background: var(--bg-sidebar);
    border-right: 1px solid rgba(30, 49, 85, 0.08);
    overflow-y: auto;
    z-index: 900;
    transition: transform var(--transition-smooth);
}

.sidebar-inner {
    padding: 20px 16px;
}

/* Sidebar Search */
.sidebar-search {
    margin-bottom: 24px;
}

.search-box {
    position: relative;
}

.search-box .search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: 10px 14px 10px 40px;
    border: 1.5px solid rgba(30, 49, 85, 0.12);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-body);
    outline: none;
    transition: var(--transition-fast);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(255, 130, 0, 0.1);
}

/* Sidebar Sections */
.sidebar-section {
    margin-bottom: 8px;
}

.sidebar-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    padding: 0 12px;
    margin-bottom: 6px;
}

/* ── Collapsible category ─────────────────────────── */
.sidebar-section-collapsible {
    margin-bottom: 2px;
}

.sidebar-category-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    background: none;
    border: none;
    outline: none;
    box-shadow: none;
    border-radius: var(--radius-sm);
    padding: 7px 10px 7px 12px;
    cursor: pointer;
    transition: background var(--transition-fast);
    text-align: left;
}

.sidebar-category-toggle:focus,
.sidebar-category-toggle:focus-visible {
    outline: none;
    box-shadow: none;
}

.sidebar-category-toggle:hover {
    background: var(--primary-light);
}

/* Dot accent bên trái */
.sidebar-category-toggle::before {
    content: '';
    display: block;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--text-muted);
    flex-shrink: 0;
    transition: background var(--transition-fast),
                transform var(--transition-fast);
}

.sidebar-category-toggle:not(.collapsed)::before {
    background: var(--primary);
    transform: scale(1.3);
}

/* Label */
.sidebar-category-toggle .sidebar-label {
    flex: 1;
    padding: 0;
    margin-bottom: 0;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.sidebar-category-toggle:hover .sidebar-label {
    color: var(--text-secondary);
}

.sidebar-category-toggle:not(.collapsed) .sidebar-label {
    color: var(--primary);
}

/* Chevron */
.sidebar-cat-chevron {
    font-size: 0.55rem;
    color: var(--text-muted);
    flex-shrink: 0;
    margin-left: auto;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                color var(--transition-fast);
}

.sidebar-category-toggle:not(.collapsed) .sidebar-cat-chevron {
    transform: rotate(180deg);
    color: var(--primary);
}

/* Vùng nội dung collapse — indent trái + đường kẻ */
.sidebar-section-collapsible .collapse,
.sidebar-section-collapsible .collapsing {
    border-left: 2px solid rgba(255, 130, 0, 0.15);
    margin-left: 18px;
    padding-left: 2px;
}

.sidebar-section-collapsible .collapse.show {
    border-left-color: rgba(255, 130, 0, 0.35);
}

/* Nav bên trong collapse */
.sidebar-section-collapsible .sidebar-nav {
    margin-bottom: 4px;
    padding-top: 2px;
}

.sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0 0 8px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.sidebar-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 60%;
    border-radius: 0 4px 4px 0;
    background: var(--primary);
    transition: transform var(--transition-fast);
}

.sidebar-link:hover {
    background: var(--primary-light);
    color: var(--primary-hover);
}

.sidebar-link:hover::before {
    transform: translateY(-50%) scaleY(1);
}

.sidebar-link.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: #fff;
    font-weight: 600;
    box-shadow: var(--shadow-glow);
}

.sidebar-link.active::before {
    display: none;
}

.sidebar-link-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    font-size: 13px;
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.sidebar-link:not(.active) .sidebar-link-icon {
    background: var(--secondary-lighter);
    color: var(--secondary);
}

.sidebar-link.active .sidebar-link-icon {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

.sidebar-link:hover:not(.active) .sidebar-link-icon {
    background: rgba(255, 130, 0, 0.15);
    color: var(--primary);
}

/* --- Mobile Sidebar Toggle --- */
.sidebar-toggle {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 1001;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: #fff;
    font-size: 18px;
    box-shadow: var(--shadow-glow);
    cursor: pointer;
    transition: var(--transition-fast);
}

.sidebar-toggle:hover {
    transform: scale(1.1);
}

/* --- Main Content --- */
.main-content {
    margin-left: var(--sidebar-w);
    flex: 1;
    padding: 32px 40px 60px;
    max-width: 100%;
    min-height: calc(100vh - var(--navbar-h));
}

/* --- Guide Sections --- */
.guide-section {
    display: none;
    animation: fadeInUp 0.4s ease;
}

.guide-section.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Section Header --- */
.section-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(30, 49, 85, 0.08);
}

.section-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 12px;
}

.breadcrumb-sep {
    font-size: 0.6rem;
    color: var(--text-muted);
}

.section-breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.section-breadcrumb a:hover {
    color: var(--primary);
}

.section-title {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--secondary);
    letter-spacing: -0.5px;
    margin: 0 0 8px;
    line-height: 1.3;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
    max-width: 680px;
}

/* --- Feature Cards --- */
.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid rgba(30, 49, 85, 0.06);
    box-shadow: var(--shadow-sm);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-hover));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card:hover::after {
    transform: scaleX(1);
}

.feature-card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 18px;
}

.bg-orange-soft {
    background: linear-gradient(135deg, rgba(255, 130, 0, 0.12), rgba(255, 130, 0, 0.05));
    color: var(--primary);
}

.bg-blue-soft {
    background: linear-gradient(135deg, rgba(30, 49, 85, 0.12), rgba(30, 49, 85, 0.05));
    color: var(--secondary);
}

.bg-green-soft {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.12), rgba(34, 197, 94, 0.05));
    color: #16a34a;
}

.feature-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 8px;
}

.feature-card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}

.feature-card-link {
    display: inline-flex;
    align-items: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.feature-card-link:hover {
    color: var(--primary-hover);
    gap: 2px;
}

.feature-card-link i {
    transition: transform var(--transition-fast);
}

.feature-card-link:hover i {
    transform: translateX(4px);
}

/* --- Content Card (for sub-pages) --- */
.content-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    border: 1px solid rgba(30, 49, 85, 0.06);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
}

.content-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 12px;
}

.content-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.text-primary {
    color: var(--primary) !important;
}

/* --- Info Banner --- */
.info-banner {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 24px;
    background: linear-gradient(135deg, var(--primary-light), rgba(255, 130, 0, 0.04));
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary);
}

.info-banner-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: #fff;
    font-size: 18px;
    flex-shrink: 0;
}

.info-banner-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--secondary);
    margin: 0 0 4px;
}

.info-banner-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* --- Scrollbar --- */
.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(30, 49, 85, 0.15);
    border-radius: 10px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(30, 49, 85, 0.25);
}

/* ── BS Component Toolbar Dropdown ──────────────────────── */
.sn-bs-dropdown-wrap {
    position: relative;
    display: inline-flex;
}

.sn-bs-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px !important;
    font-size: 13px !important;
    color: #333 !important;
    background: transparent !important;
    border: none !important;
    border-radius: 4px !important;
    cursor: pointer;
    transition: background 0.15s;
    white-space: nowrap;
}

.sn-bs-btn:hover {
    background: rgba(255, 130, 0, 0.1) !important;
    color: var(--primary) !important;
}

/* Dropdown panel */
.sn-bs-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    z-index: 99999;
    min-width: 220px;
    background: #fff;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 10px;
    box-shadow: 0 8px 24px rgba(30,49,85,0.14);
    overflow: hidden;
    animation: sn-drop-in 0.15s ease;
}

.sn-bs-dropdown.show {
    display: block;
}

@keyframes sn-drop-in {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Label tiêu đề dropdown */
.sn-bs-dropdown-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    padding: 8px 14px 4px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    margin-bottom: 4px;
}

/* Items */
.sn-bs-dropdown .sn-bs-item {
    display: block;
    padding: 7px 14px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background 0.12s, color 0.12s;
    cursor: pointer;
    white-space: nowrap;
}

.sn-bs-dropdown .sn-bs-item:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.sn-bs-dropdown .sn-bs-item:last-child {
    margin-bottom: 4px;
}

/* Summernote toolbar: nhóm BS nổi bật hơn */
.note-toolbar .note-bs .note-btn:first-child {
    border-left: 2px solid rgba(255,130,0,0.3);
    margin-left: 4px;
    padding-left: 6px;
}

/* --- Responsive --- */
@media (max-width: 991.98px) {
    .main-content {
        padding: 24px 20px 60px;
    }
}

@media (max-width: 767.98px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }

    .main-content {
        margin-left: 0;
        padding: 20px 16px 80px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .feature-card {
        padding: 20px;
    }
}