/* ============================================================
   style.css - FINAL ULTIMATE EDITION
   ============================================================ */

/* 1. KHAI BÁO BIẾN MÀU (COLOR VARIABLES) */
:root {
    /* --- LIGHT MODE --- */
    --bg-body: #f8f9fa;
    --bg-sidebar: #ffffff;
    --bg-editor: #ffffff;
    --bg-input: #f8f9fa;
    --bg-hover: #f1f3f5;
    --bg-active: #e7f1ff;
    
    --text-main: #212529;
    --text-muted: #6c757d;       /* Màu xám vừa phải */
    --text-placeholder: #adb5bd; /* Màu riêng cho placeholder */
    
    --border-color: #dee2e6;
    --scroll-thumb: #ced4da;
    --accent-color: #0d6efd;
}

/* --- DARK MODE --- */
body.dark-mode {
    --bg-body: #121212;
    --bg-sidebar: #1e1e1e;
    --bg-editor: #1e1e1e;
    --bg-input: #2d2d2d;
    --bg-hover: #2c2c2c;
    --bg-active: #0d3b66;
    
    --text-main: #e0e0e0;
    --text-muted: #b0b0b0;       /* Sáng hơn để dễ đọc trên nền tối */
    --text-placeholder: #888888; /* Màu placeholder sáng hơn */
    
    --border-color: #444444;
    --scroll-thumb: #555555;
    --accent-color: #6ea8fe;
}

/* 2. CẤU HÌNH CHUNG */
html, body {
    height: 100%;
    margin: 0;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    font-size: 14px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* XỬ LÝ PLACEHOLDER (QUAN TRỌNG CHO DARK MODE) */
::placeholder {
    color: var(--text-placeholder) !important;
    opacity: 1 !important; /* Fix lỗi Firefox tự làm mờ */
}
::-webkit-input-placeholder { color: var(--text-placeholder) !important; }
::-moz-placeholder { color: var(--text-placeholder) !important; opacity: 1 !important; }

/* Custom Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border-radius: 10px; }

/* 3. SIDEBAR (CỘT TRÁI) */
.col-md-3, .col-lg-2 {
    background-color: var(--bg-sidebar) !important;
    border-right: 1px solid var(--border-color) !important;
}

/* Ô tìm kiếm */
#search-input {
    background-color: var(--bg-input) !important;
    color: var(--text-main) !important;
    border: 1px solid transparent;
}
#search-input:focus { 
    border-color: var(--accent-color); 
    background-color: var(--bg-sidebar) !important; 
}

/* Danh sách Folder & Note (Có thanh cuộn) */
#folder-list, #note-list {
    background-color: var(--bg-sidebar);
    border-top: 1px solid var(--border-color);
    overflow-y: auto; /* Tự hiện thanh cuộn khi nội dung dài */
}

/* Tree View (Thư mục) */
.tree-group { border-bottom: 1px solid var(--border-color); margin-bottom: 5px; }
.tree-divider { color: var(--text-muted); font-size: 0.75rem; font-weight: 700; padding: 10px 15px 5px; }

.tree-item { 
    color: var(--text-main); 
    padding: 8px 15px; 
    cursor: pointer; 
    border-radius: 6px; 
    margin: 2px 8px; 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
}
.tree-item:hover { background-color: var(--bg-hover); }
.tree-item.active { 
    background-color: var(--bg-active); 
    color: var(--accent-color); 
    font-weight: 600; 
}
.tree-item i:first-child { 
    margin-right: 10px; 
    width: 18px; 
    text-align: center; 
    color: var(--text-muted); 
}
.tree-item.active i:first-child { color: var(--accent-color); }

/* Nút hành động trên Folder (Sửa/Xóa) */
.folder-action-btn {
    opacity: 0;
    transition: all 0.2s;
    padding: 6px;
    cursor: pointer;
    border-radius: 4px;
}
.tree-item:hover .folder-action-btn { opacity: 1; }
.folder-action-btn:hover {
    background-color: rgba(0,0,0,0.1); 
    opacity: 1;
}
/* Trên mobile luôn hiện nút để dễ bấm */
@media (max-width: 767.98px) {
    .folder-action-btn { opacity: 1 !important; }
}

/* Note List Item */
.list-group-item {
    background-color: var(--bg-sidebar); 
    color: var(--text-main);
    border: none; 
    border-bottom: 1px solid var(--border-color); 
    border-radius: 0 !important;
    padding: 12px 15px;
}
.list-group-item:hover:not(.active) { background-color: var(--bg-hover); }
.list-group-item.active { 
    background-color: var(--bg-active); 
    color: var(--text-main); 
    border-left: 3px solid var(--accent-color); 
}
#note-count { background-color: var(--bg-hover) !important; color: var(--text-main) !important; }

/* 4. EDITOR (TRÌNH SOẠN THẢO) */
.col-md-9, .col-lg-10 { background-color: var(--bg-editor) !important; }
#editor-wrapper { 
    background-color: var(--bg-editor); 
    border-top: 1px solid var(--border-color) !important; 
}

/* Tiêu đề Note */
#note-title { 
    background-color: var(--bg-editor) !important; 
    color: var(--text-main) !important; 
    border: none; 
    padding-left: 20px !important; 
    font-size: 1.4rem; 
}

/* QuillJS Toolbar & Editor */
.ql-toolbar { 
    background-color: var(--bg-editor) !important; 
    border-bottom: 1px solid var(--border-color) !important; 
}
body.dark-mode .ql-stroke { stroke: #e0e0e0 !important; }
body.dark-mode .ql-fill { fill: #e0e0e0 !important; }
body.dark-mode .ql-picker { color: #e0e0e0 !important; }
body.dark-mode .ql-picker-options { background-color: var(--bg-sidebar) !important; }

.ql-editor { color: var(--text-main); padding: 20px; font-size: 16px; }
.ql-editor.ql-blank::before { color: var(--text-placeholder) !important; font-style: italic; }

/* Các thành phần Bootstrap mặc định */
.bg-light { 
    background-color: var(--bg-sidebar) !important; 
    border-color: var(--border-color) !important; 
    color: var(--text-muted) !important; 
}

/* 5. MODAL & FORM */
.modal-content { background-color: var(--bg-sidebar); color: var(--text-main); border: 1px solid var(--border-color); }
.form-control { background-color: var(--bg-input); color: var(--text-main); border: 1px solid var(--border-color); }
.form-control:focus { background-color: var(--bg-input); color: var(--text-main); border-color: var(--accent-color); }

/* 6. MOBILE RESPONSIVE (OFF-CANVAS SIDEBAR) */
@media (max-width: 767.98px) {
    /* Menu trượt từ trái sang */
    #sidebar-wrapper {
        position: fixed; 
        top: 0; 
        left: -280px; 
        width: 280px; 
        height: 100vh;
        z-index: 1050; 
        transition: left 0.3s ease-in-out;
        box-shadow: 4px 0 15px rgba(0,0,0,0.1);
        display: flex !important; 
        flex-direction: column;
    }
    #sidebar-wrapper.show { left: 0; }

    /* Overlay che nền */
    .sidebar-overlay {
        position: fixed; 
        top: 0; 
        left: 0; 
        width: 100vw; 
        height: 100vh;
        background: rgba(0, 0, 0, 0.5); 
        z-index: 1040;
        display: none; 
        backdrop-filter: blur(2px);
    }
    .sidebar-overlay.show { display: block; }

    /* Chiều cao Editor trên Mobile */
    #editor-wrapper { 
        height: calc(100vh - 56px - 50px); /* Trừ Navbar và Footer */
    }
}