:root {
    /* --- BẢNG MÀU MẶC ĐỊNH (LIGHT MODE) --- */
    --wiki-bg: #ffffff;
    --wiki-card-bg: #ffffff;
    --wiki-sidebar-bg: #f6f6f6;
    --wiki-border: #a2a9b1;
    --wiki-link: #0645ad;
    --wiki-link-hover: #0b0080;
    --wiki-text: #202122;
    --wiki-text-muted: #54595d;
    --wiki-input-bg: #ffffff;
    --wiki-badge-bg: #eaecf0;
    
    /* Màu tiêu đề đặc trưng */
    --theme-yellow-text: #d47500;
    --theme-blue-text: #1a5bc4;
    --theme-green-text: #1e7045;

    --sidebar-width: 176px;
}

/* --- BẢNG MÀU DARK MODE --- */
body.dark-mode {
    --wiki-bg: #121212;
    --wiki-card-bg: #1e1e1e;
    --wiki-sidebar-bg: #181818;
    --wiki-border: #333333;
    --wiki-link: #6699ff;
    --wiki-link-hover: #99bbff;
    --wiki-text: #e0e0e0;
    --wiki-text-muted: #999999;
    --wiki-input-bg: #2a2a2a;
    --wiki-badge-bg: #2d2d2d;
    
    --theme-yellow-text: #f0a030;
    --theme-blue-text: #5b96f7;
    --theme-green-text: #4caf75;
}

/* --- BẢNG MÀU SAPPHIRE MODE --- */
body.sapphire-mode {
    --wiki-bg: #0d1726;
    --wiki-card-bg: #142238;
    --wiki-sidebar-bg: #0b1320;
    --wiki-border: #213554;
    --wiki-link: #6db1ff;
    --wiki-link-hover: #9bd0ff;
    --wiki-text: #c2d1e0;
    --wiki-text-muted: #7b93ab;
    --wiki-input-bg: #1a2a42;
    --wiki-badge-bg: #1d304a;
    
    --theme-yellow-text: #f5b958;
    --theme-blue-text: #7ab0ff;
    --theme-green-text: #6ed198;
}

body {
    font-family: sans-serif;
    background-color: var(--wiki-bg);
    color: var(--wiki-text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    font-size: 14px; 
    transition: background-color 0.3s, color 0.3s;
}

/* --- TỔNG QUAN LAYOUT --- */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* --- SIDEBAR WIKI STYLE --- */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--wiki-sidebar-bg);
    border-right: 1px solid var(--wiki-border);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    z-index: 2000;
    transition: background-color 0.3s, border-color 0.3s;
}

.sidebar-header {
    padding: 20px 10px;
    text-align: center;
    border-bottom: 1px solid var(--wiki-border);
    background: var(--wiki-card-bg);
    transition: background-color 0.3s;
}

.wiki-logo {
    font-size: 40px;
    color: var(--wiki-text);
    margin-bottom: 5px;
}

.sidebar-brand h2 {
    margin: 0;
    font-size: 17px;
    font-family: 'Times New Roman', Times, serif;
    color: var(--wiki-text);
    line-height: 1.3;
}

.sidebar-brand p {
    margin: 4px 0 0 0;
    font-size: 11px;
    color: var(--wiki-text-muted);
}

.sidebar-nav-title {
    font-size: 12px;
    color: var(--wiki-text-muted);
    padding: 15px 15px 5px 15px;
    border-top: 1px solid var(--wiki-border);
    margin-top: 10px;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu-item {
    padding: 5px 15px;
    cursor: pointer;
    font-size: 13px;
    color: var(--wiki-link);
}

.menu-item:hover {
    text-decoration: underline;
}

.menu-item.active {
    font-weight: bold;
    color: var(--wiki-text);
}

/* --- MAIN CONTENT WRAPPER --- */
.main-content-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    width: calc(100% - var(--sidebar-width));
    display: flex;
    flex-direction: column;
    background: var(--wiki-bg);
}

/* --- TOP HEADER (TABS, TOOLS & SEARCH) --- */
.wiki-top-header {
    padding: 15px 30px 0 30px;
    background-color: var(--wiki-bg);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.wiki-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    border-bottom: 1px solid var(--wiki-border);
    flex-wrap: wrap;
}

.tabs {
    display: flex;
}

.tab-btn {
    background: transparent;
    border: 1px solid transparent;
    border-bottom: none;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 16px; /* Chữ Tab bự */
    color: var(--wiki-link);
    margin-bottom: -1px;
}

.tab-btn:hover {
    text-decoration: underline;
}

.tab-btn.active {
    background: var(--wiki-bg);
    border: 1px solid var(--wiki-border);
    border-bottom: 1px solid var(--wiki-bg);
    color: var(--wiki-text);
    font-weight: bold;
}

/* --- VIEW CONTROLS & SEARCH --- */
.top-bar-right {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 4px;
}

.view-controls {
    display: flex;
    gap: 4px;
}

.view-btn {
    background: var(--wiki-card-bg);
    border: 1px solid var(--wiki-border);
    color: var(--wiki-text-muted);
    border-radius: 3px;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 13px;
    transition: all 0.2s ease;
}

.view-btn:hover {
    background: var(--wiki-border);
    color: var(--wiki-text);
}

.search-box {
    position: relative;
}

.search-icon {
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--wiki-text-muted);
    font-size: 12px;
}

#searchInput {
    padding: 4px 10px 4px 25px;
    font-size: 13px;
    border: 1px solid var(--wiki-border);
    border-radius: 2px;
    width: 250px;
    background-color: var(--wiki-input-bg);
    color: var(--wiki-text);
}

/* --- PAGE TITLE --- */
.wiki-page-header {
    padding: 15px 0 10px 0;
    border-bottom: 1px solid var(--wiki-border);
}

.firstHeading {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.8em;
    font-weight: normal;
    margin: 0 0 10px 0;
    border-bottom: none;
    color: var(--wiki-text);
}

/* --- ALPHABET FILTER --- */
.alphabet-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.alpha-btn {
    background: var(--wiki-sidebar-bg);
    border: 1px solid var(--wiki-border);
    color: var(--wiki-link);
    padding: 2px 6px;
    cursor: pointer;
    font-size: 12px;
}

.alpha-btn:hover {
    background: var(--wiki-border);
    color: var(--wiki-text);
}

.alpha-btn.active {
    background: var(--wiki-text-muted);
    color: #fff;
    border-color: var(--wiki-text-muted);
}

/* =========================================================
   THIẾT KẾ ĐIỂM NHẤN CHO DANH SÁCH (CARD)
   ========================================================= */
.container {
    padding: 15px 30px 60px 30px;
}

.wiki-entry {
    border: 1px solid var(--wiki-border);
    margin-bottom: 24px;
    background-color: var(--wiki-card-bg);
    clear: both;
    transition: background-color 0.3s, border-color 0.3s;
}

.wiki-entry-header {
    padding: 8px 12px;
    border-bottom: 1px solid var(--wiki-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--wiki-card-bg);
}

.wiki-entry-header h2 {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.25em;
    font-weight: bold;
    margin: 0;
    display: flex;
    align-items: center;
}

/* Link màu Theme */
.theme-yellow .en-title { color: var(--theme-yellow-text); }
.theme-blue .en-title { color: var(--theme-blue-text); }
.theme-green .en-title { color: var(--theme-green-text); }

.vi-title {
    font-family: sans-serif;
    font-size: 0.7em;
    font-weight: normal;
    color: var(--wiki-text-muted);
    margin-left: 6px;
    font-style: italic;
}

/* Cụm nút hành động (Copy, Share, Edit) */
.wiki-entry-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.wiki-action-btn {
    font-size: 12px;
    color: var(--wiki-link);
    cursor: pointer;
    user-select: none;
    transition: color 0.2s;
}

.wiki-action-btn:hover {
    text-decoration: underline;
    color: var(--wiki-link-hover);
}

.wiki-entry-body {
    padding: 12px 15px;
}

.wiki-badge {
    display: inline-block;
    padding: 2px 6px;
    background: var(--wiki-badge-bg);
    border: 1px solid var(--wiki-border);
    font-size: 11px;
    margin-bottom: 10px;
    color: var(--wiki-text);
}

.wiki-content-row {
    margin-bottom: 8px;
}

.wiki-content-row strong {
    color: var(--wiki-text);
}

/* --- COMING SOON --- */
.coming-soon {
    display: none;
    flex-direction: column;
    align-items: center;
    padding: 50px;
    color: var(--wiki-text-muted);
}

/* --- MODAL (POPUP ĐÓNG GÓP) --- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 3000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--wiki-card-bg);
    width: 500px;
    max-width: 90%;
    border: 1px solid var(--wiki-border);
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

.modal-header {
    padding: 15px;
    border-bottom: 1px solid var(--wiki-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--wiki-sidebar-bg);
}

.modal-header h2 {
    margin: 0; font-family: 'Times New Roman', Times, serif; font-size: 1.4em;
    color: var(--wiki-text);
}

.modal-close {
    font-size: 24px;
    cursor: pointer;
    color: var(--wiki-text-muted);
}

.modal-body {
    padding: 20px;
}

.modal-notice {
    background: var(--wiki-sidebar-bg);
    border: 1px solid var(--wiki-link);
    padding: 10px;
    font-size: 12px;
    margin-bottom: 15px;
    color: var(--wiki-text);
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block; font-weight: bold; margin-bottom: 5px; font-size: 13px; color: var(--wiki-text);
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    box-sizing: border-box;
    padding: 6px;
    border: 1px solid var(--wiki-border);
    font-family: sans-serif;
    font-size: 13px;
    background: var(--wiki-input-bg);
    color: var(--wiki-text);
}

.form-actions {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.btn-cancel {
    padding: 6px 12px;
    background: var(--wiki-sidebar-bg); 
    border: 1px solid var(--wiki-border); 
    cursor: pointer;
    color: var(--wiki-text);
}

.btn-submit {
    padding: 6px 12px;
    background: #36c; color: #fff; border: 1px solid #36c; cursor: pointer; font-weight: bold;
}

/* --- FOOTER --- */
.wiki-footer {
    border-top: 1px solid var(--wiki-border);
    padding: 15px 30px;
    font-size: 12px;
    color: var(--wiki-text-muted);
    margin-top: auto;
    background: var(--wiki-bg);
}

.back-to-top {
    position: fixed; bottom: 30px; right: 30px;
    width: 40px; height: 40px;
    background: var(--wiki-card-bg); border: 1px solid var(--wiki-border);
    cursor: pointer; display: none; align-items: center; justify-content: center;
    color: var(--wiki-text);
}

/* =========================================================
   THIẾT KẾ LIÊN KẾT CHÉO VÀ TRÍCH DẪN (WIKIPEDIA STYLE)
   ========================================================= */
.wiki-internal-link {
    color: var(--wiki-link);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.wiki-internal-link:hover {
    text-decoration: underline;
    color: var(--wiki-link-hover);
}

.reference {
    font-size: 10px;
    line-height: 1;
    color: var(--wiki-link);
    cursor: pointer;
    margin-left: 2px;
}

.wiki-references-block {
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px dashed var(--wiki-border);
}

.wiki-references-block h4 {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.1em;
    font-weight: bold;
    margin: 0 0 5px 0;
    color: var(--wiki-text);
}

.references-list {
    margin: 0;
    padding-left: 20px;
    font-size: 11.5px;
    color: var(--wiki-text-muted);
}

.references-list li {
    margin-bottom: 4px;
}