/*
Theme Name: Học Tiếng Trung AI Theme
Theme URI: https://hoctiengtrungai.com
Author: Hoc Tieng Trung AI
Description: Theme frontend cho nền tảng học tiếng Trung AI - đồng bộ với plugin Học Tiếng Trung AI (Từ vựng, Ngữ pháp, Hội thoại, Luyện thi HSK, Dịch, Tài khoản...). Yêu cầu cài plugin "Học Tiếng Trung AI" để có đầy đủ dữ liệu và REST API.
Version: 1.2.3
License: GPLv2 or later
Text Domain: htta-theme
*/

:root{
	--htta-primary:#6366F1; --htta-primary-hover:#4F46E5; --htta-success:#10B981;
	--htta-warning:#F59E0B; --htta-danger:#EF4444; --htta-info:#3882F6; --htta-secondary:#6B7280;
	--htta-bg:#F8FAFC; --htta-surface:#FFFFFF; --htta-border:#E5E7EB;
	--htta-text:#111827; --htta-text-secondary:#6B7280; --htta-text-muted:#9CA3AF;
	--htta-radius:12px; --htta-radius-sm:8px;
	--htta-shadow:0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
}
*{ box-sizing:border-box; }
body{ margin:0; font-family:'Inter',-apple-system,Segoe UI,Roboto,sans-serif; color:var(--htta-text); background:var(--htta-bg); line-height:1.6; }
a{ color:var(--htta-primary); text-decoration:none; }
img{ max-width:100%; display:block; }
.htta-container{ max-width:1200px; margin:0 auto; padding:0 20px; }
h1,h2,h3,h4{ font-weight:700; line-height:1.25; margin:0 0 12px; }
.htta-btn{ display:inline-flex; align-items:center; gap:6px; padding:10px 20px; border-radius:var(--htta-radius-sm); font-weight:600; font-size:14px; border:1px solid transparent; cursor:pointer; }
.htta-btn-primary, .htta-btn-primary[type=submit]{ background:var(--htta-primary); color:#fff; }
.htta-btn-primary:hover{ background:var(--htta-primary-hover); }
.htta-btn-outline{ background:#fff; border-color:var(--htta-border); color:var(--htta-text); }
.htta-btn-outline:hover{ border-color:var(--htta-primary); color:var(--htta-primary); }
.htta-badge{ display:inline-block; padding:2px 10px; border-radius:999px; font-size:12px; font-weight:600; }
.htta-badge-success{ background:#D1FAE5; color:#047857; }
.htta-badge-warning{ background:#FEF3C7; color:#B45309; }
.htta-badge-info{ background:#DBEAFE; color:#1D4ED8; }
.htta-badge-muted{ background:#F1F5F9; color:#475569; }

/* ===== Header ===== */
.htta-header{ background:var(--htta-surface); border-bottom:1px solid var(--htta-border); position:sticky; top:0; z-index:100; }
.htta-header-inner{ display:flex; align-items:center; gap:24px; padding:14px 0; }
.htta-logo{ font-size:20px; font-weight:800; color:var(--htta-text); display:flex; align-items:center; gap:8px; }
.htta-logo span{ color:var(--htta-primary); }
.htta-nav{ display:flex; gap:20px; flex:1; }
.htta-nav a{ color:var(--htta-text); font-weight:500; font-size:14px; }
.htta-nav a:hover{ color:var(--htta-primary); }
.htta-header-actions{ display:flex; align-items:center; gap:12px; }
.htta-icon-btn{ background:none; border:none; cursor:pointer; font-size:18px; color:var(--htta-text-secondary); }
.htta-mobile-toggle{ display:none; background:none; border:none; font-size:22px; cursor:pointer; }
@media (max-width:900px){
	.htta-nav{ display:none; flex-direction:column; position:absolute; top:100%; left:0; right:0; background:#fff; padding:16px 20px; border-bottom:1px solid var(--htta-border); }
	.htta-nav.is-open{ display:flex; }
	.htta-mobile-toggle{ display:block; }
}

/* ===== Search & Auth Modal ===== */
.htta-modal-overlay{ position:fixed; inset:0; background:rgba(17,24,39,.5); display:none; align-items:center; justify-content:center; z-index:1000; }
.htta-modal-overlay.is-open{ display:flex; }
.htta-modal{ background:#fff; border-radius:var(--htta-radius); padding:24px; width:90%; max-width:480px; max-height:85vh; overflow:auto; position:relative; }
.htta-modal-close{ position:absolute; top:14px; right:14px; background:none; border:none; font-size:20px; cursor:pointer; }
.htta-search-input{ width:100%; padding:12px 14px; border:1px solid var(--htta-border); border-radius:var(--htta-radius-sm); font-size:15px; }
.htta-search-results{ margin-top:14px; }
.htta-search-result-item{ display:flex; justify-content:space-between; padding:10px 0; border-bottom:1px solid var(--htta-border); }

/* ===== Auth form ===== */
.htta-auth-tabs{ display:flex; gap:8px; margin-bottom:16px; }
.htta-auth-tab{ flex:1; padding:10px; border:1px solid var(--htta-border); background:#fff; border-radius:var(--htta-radius-sm); cursor:pointer; font-weight:600; }
.htta-auth-tab.active{ background:var(--htta-primary); color:#fff; border-color:var(--htta-primary); }
.htta-auth-form label{ display:block; margin-bottom:12px; font-size:13px; color:var(--htta-text-secondary); }
.htta-auth-form input{ width:100%; padding:10px 12px; border:1px solid var(--htta-border); border-radius:var(--htta-radius-sm); margin-top:4px; font-size:14px; }

/* ===== Hero ===== */
.htta-hero{ background:linear-gradient(135deg,#EEF2FF 0%, #F5F3FF 100%); padding:64px 0; }
.htta-hero-inner{ display:grid; grid-template-columns:1.1fr .9fr; gap:40px; align-items:center; }
@media (max-width:900px){ .htta-hero-inner{ grid-template-columns:1fr; } }
.htta-hero h1{ font-size:40px; margin-bottom:16px; }
.htta-hero h1 span{ color:var(--htta-primary); }
.htta-hero p{ color:var(--htta-text-secondary); font-size:16px; margin-bottom:24px; }
.htta-hero-actions{ display:flex; gap:12px; }
.htta-hero-stats{ display:flex; gap:28px; margin-top:32px; }
.htta-hero-stats div strong{ display:block; font-size:24px; color:var(--htta-primary); }
.htta-hero-stats div span{ font-size:13px; color:var(--htta-text-secondary); }
.htta-hero-visual{ background:#fff; border-radius:var(--htta-radius); padding:24px; box-shadow:var(--htta-shadow); }

/* ===== Sections / grids ===== */
.htta-section{ padding:56px 0; }
.htta-section-head{ text-align:center; max-width:640px; margin:0 auto 36px; }
.htta-section-head p{ color:var(--htta-text-secondary); }
.htta-grid{ display:grid; gap:20px; }
.htta-grid-2{ grid-template-columns:repeat(2,1fr); }
.htta-grid-3{ grid-template-columns:repeat(3,1fr); }
.htta-grid-4{ grid-template-columns:repeat(4,1fr); }
@media (max-width:900px){ .htta-grid-2,.htta-grid-3,.htta-grid-4{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:600px){ .htta-grid-2,.htta-grid-3,.htta-grid-4{ grid-template-columns:1fr; } }

.htta-feature-card{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:24px; }
.htta-feature-card .icon{ width:44px; height:44px; border-radius:10px; background:#EEF2FF; color:var(--htta-primary); display:flex; align-items:center; justify-content:center; font-size:20px; margin-bottom:14px; }

.htta-course-card{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); overflow:hidden; }
.htta-course-thumb{ height:120px; display:flex; align-items:center; justify-content:center; color:#fff; font-weight:800; font-size:20px; }
.htta-course-thumb-green{ background:#10B981; } .htta-course-thumb-blue{ background:#3882F6; }
.htta-course-thumb-orange{ background:#F59E0B; } .htta-course-thumb-pink{ background:#EC4899; }
.htta-course-body{ padding:18px; }
.htta-course-body ul{ list-style:none; padding:0; margin:8px 0; font-size:13px; color:var(--htta-text-secondary); }
.htta-course-price{ font-weight:700; margin-top:10px; color:var(--htta-primary); }

/* ===== Listing pages (Từ vựng, Ngữ pháp...) ===== */
.htta-page-hero{ background:#fff; border-bottom:1px solid var(--htta-border); padding:32px 0; }
.htta-breadcrumb{ font-size:13px; color:var(--htta-text-secondary); margin-bottom:10px; }
.htta-breadcrumb a{ color:var(--htta-text-secondary); }
.htta-filter-row{ display:flex; gap:10px; flex-wrap:wrap; margin:20px 0; }
.htta-filter-row select, .htta-filter-row input{ padding:9px 12px; border:1px solid var(--htta-border); border-radius:var(--htta-radius-sm); background:#fff; }

.htta-vocab-card{ display:block; background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:18px; text-align:center; color:inherit; transition:box-shadow .15s, transform .15s, border-color .15s; position:relative; }
a.htta-vocab-card:hover{ box-shadow:var(--htta-shadow); transform:translateY(-2px); border-color:var(--htta-primary); }
.htta-vocab-card .hz{ font-size:34px; font-weight:700; }
.htta-vocab-card .py{ color:var(--htta-primary); font-size:14px; margin:4px 0; }
.htta-vocab-card .mn{ color:var(--htta-text-secondary); font-size:13px; }
.htta-vocab-card .htta-audio-btn{ margin-top:8px; }

/* ---- Trang chi tiết từ vựng ---- */
.htta-vocab-detail-head{ text-align:center; background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:36px 20px 28px; }
.htta-vocab-detail-hz{ font-size:64px; font-weight:800; line-height:1.1; }
.htta-vocab-detail-py{ color:var(--htta-primary); font-size:22px; margin-top:8px; }
.htta-vocab-detail-tags{ display:flex; flex-wrap:wrap; gap:8px; justify-content:center; margin:16px 0 4px; }
.htta-vocab-detail-block{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:20px 22px; margin-top:18px; }
.htta-vocab-detail-block h3{ margin:0 0 10px; font-size:16px; }
.htta-vocab-examples{ list-style:none; margin:0; padding:0; }
.htta-vocab-examples li{ padding:12px 0; border-bottom:1px solid var(--htta-border); }
.htta-vocab-examples li:last-child{ border-bottom:0; }
.htta-vocab-examples .ex-hz{ font-size:20px; font-weight:600; }
.htta-vocab-examples .ex-py{ color:var(--htta-primary); font-size:13px; margin-top:2px; }
.htta-vocab-examples .ex-mn{ color:var(--htta-text-secondary); font-size:14px; margin-top:2px; }
.htta-vocab-related{ margin-top:34px; }
.htta-vocab-related h3{ margin-bottom:14px; }

/* --- Trang chi tiết từ vựng (nâng cấp) --- */
.htta-vocab-detail-toptags{ display:flex; gap:8px; justify-content:center; margin-bottom:14px; }
.htta-vocab-detail-actions{ display:flex; gap:10px; justify-content:center; margin-top:18px; }
.htta-audio-btn-lg{ font-size:14px; padding:10px 18px; background:var(--htta-primary); color:#fff; font-weight:600; }
.htta-audio-btn-lg:hover{ background:var(--htta-primary-hover); }
.htta-copy-btn{ display:inline-flex; align-items:center; gap:6px; cursor:pointer; background:#F1F5F9; border:none; border-radius:999px; padding:10px 18px; font-size:14px; font-weight:600; color:var(--htta-text); }
.htta-copy-btn:hover{ background:#E2E8F0; }
.htta-copy-btn.copied{ background:#D1FAE5; color:#047857; }

.htta-vocab-quickinfo{ display:grid; grid-template-columns:repeat(auto-fit,minmax(120px,1fr)); gap:1px; background:var(--htta-border); border:1px solid var(--htta-border); border-radius:var(--htta-radius); overflow:hidden; margin-top:18px; }
.htta-quick-item{ background:#fff; padding:14px 12px; text-align:center; }
.htta-quick-item .qi-label{ display:block; font-size:12px; color:var(--htta-text-secondary); margin-bottom:4px; }
.htta-quick-item .qi-value{ display:block; font-size:16px; font-weight:700; color:var(--htta-text); }

.htta-block-icon{ margin-right:4px; }
.htta-vocab-detail-block h3{ display:flex; align-items:center; }
.htta-vocab-meaning{ font-size:17px; margin:0; }

.htta-char-grid{ display:flex; flex-wrap:wrap; gap:12px; }
.htta-char-card{ display:flex; flex-direction:column; align-items:center; gap:8px; background:var(--htta-bg); border:1px solid var(--htta-border); border-radius:var(--htta-radius-sm); padding:14px 18px; min-width:78px; }
.htta-char-hz{ font-size:40px; font-weight:800; line-height:1; }
.htta-char-audio{ padding:4px 10px; font-size:12px; }
.htta-char-note{ margin:14px 0 0; font-size:13px; color:var(--htta-text-secondary); }

.htta-vocab-note{ background:#FFFBEB; border-color:#FDE68A; }
.htta-vocab-topics{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin-top:18px; }
.htta-vocab-topics-label{ font-size:13px; color:var(--htta-text-secondary); }
.htta-audio-btn{ display:inline-flex; align-items:center; gap:6px; cursor:pointer; background:#F1F5F9; border:none; border-radius:999px; padding:6px 12px; font-size:13px; color:var(--htta-text); }
.htta-audio-btn:hover{ background:#E2E8F0; }
.htta-audio-btn-lg{ margin-top:16px; padding:10px 18px; font-size:14px; font-weight:600; }

.htta-grammar-card, .htta-sentence-card, .htta-reading-card, .htta-dialogue-card, .htta-test-card{
	background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:20px;
}
.htta-card-top{ display:flex; justify-content:space-between; align-items:center; margin-bottom:10px; }

.htta-audio-btn{ background:#EEF2FF; border:none; border-radius:50%; width:30px; height:30px; cursor:pointer; font-size:14px; }

/* Ghi đè: các nút audio đặc biệt KHÔNG bị bó về hình tròn 30px */
.htta-vocab-detail-actions .htta-audio-btn-lg{
	display:inline-flex; align-items:center; justify-content:center; gap:8px;
	width:auto; height:auto; border-radius:999px;
	padding:11px 20px; font-size:14px; font-weight:600; line-height:1; white-space:nowrap;
	background:var(--htta-primary); color:#fff;
}
.htta-vocab-detail-actions .htta-audio-btn-lg:hover{ background:var(--htta-primary-hover); }
.htta-char-card .htta-char-audio{
	display:inline-flex; align-items:center; justify-content:center;
	width:38px; height:38px; border-radius:50%; font-size:16px;
	background:var(--htta-primary); color:#fff; border:none;
	line-height:1; cursor:pointer; box-shadow:0 2px 6px rgba(99,102,241,.35);
}
.htta-char-card .htta-char-audio:hover{ background:var(--htta-primary-hover); transform:translateY(-1px); }
.htta-vocab-examples .ex-hz .htta-audio-btn{
	width:30px; height:30px; vertical-align:middle; margin-left:4px;
}

/* ===== Hội thoại / Chat ===== */
.htta-chat-widget{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:16px; display:flex; flex-direction:column; height:420px; }
.htta-chat-messages{ flex:1; overflow-y:auto; padding:6px; }
.htta-chat-bubble{ max-width:75%; padding:10px 14px; border-radius:14px; margin-bottom:10px; font-size:14px; }
.htta-chat-bubble.ai{ background:#F3F4F6; align-self:flex-start; }
.htta-chat-bubble.user{ background:var(--htta-primary); color:#fff; align-self:flex-end; margin-left:auto; }
.htta-chat-form{ display:flex; gap:8px; margin-top:10px; }
.htta-chat-form input{ flex:1; padding:10px 12px; border:1px solid var(--htta-border); border-radius:999px; }
.htta-chat-form button{ background:var(--htta-primary); color:#fff; border:none; border-radius:50%; width:38px; height:38px; cursor:pointer; }

/* ===== Translate widget ===== */
.htta-translate-widget{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:24px; }
.htta-translate-controls{ display:flex; align-items:center; gap:10px; margin-bottom:14px; }
.htta-translate-controls select{ padding:8px 10px; border:1px solid var(--htta-border); border-radius:8px; }
.htta-translate-cols{ display:grid; grid-template-columns:1fr 1fr; gap:14px; }
@media (max-width:700px){ .htta-translate-cols{ grid-template-columns:1fr; } }
.htta-translate-cols textarea{ width:100%; padding:12px; border:1px solid var(--htta-border); border-radius:8px; resize:vertical; font-family:inherit; }
.htta-translate-output{ background:#F9FAFB; border:1px solid var(--htta-border); border-radius:8px; padding:12px; min-height:140px; }

/* ===== Account page ===== */
.htta-account-layout{ display:grid; grid-template-columns:240px 1fr; gap:24px; }
@media (max-width:800px){ .htta-account-layout{ grid-template-columns:1fr; } }
.htta-account-sidebar{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:16px; }
.htta-account-sidebar a{ display:block; padding:10px 12px; border-radius:8px; color:var(--htta-text); margin-bottom:4px; font-size:14px; }
.htta-account-sidebar a.active, .htta-account-sidebar a:hover{ background:#EEF2FF; color:var(--htta-primary); }
.htta-stat-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-bottom:20px; }
@media (max-width:700px){ .htta-stat-row{ grid-template-columns:repeat(2,1fr); } }
.htta-stat-card{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:16px; }
.htta-stat-card strong{ display:block; font-size:22px; }

/* ===== Blog ===== */
.htta-blog-grid{ display:grid; grid-template-columns:2fr 1fr; gap:30px; }
@media (max-width:900px){ .htta-blog-grid{ grid-template-columns:1fr; } }
.htta-post-card{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); overflow:hidden; margin-bottom:24px; }
.htta-post-card img{ width:100%; height:200px; object-fit:cover; }
.htta-post-card .body{ padding:18px; }
.htta-post-meta{ font-size:12px; color:var(--htta-text-muted); margin-bottom:6px; }

/* ===== Footer ===== */
.htta-footer{ background:#111827; color:#D1D5DB; padding:48px 0 20px; margin-top:40px; }
.htta-footer-grid{ display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:30px; }
@media (max-width:800px){ .htta-footer-grid{ grid-template-columns:1fr 1fr; } }
.htta-footer h4{ color:#fff; font-size:14px; margin-bottom:14px; }
.htta-footer ul{ list-style:none; padding:0; margin:0; }
.htta-footer ul li{ margin-bottom:8px; }
.htta-footer a{ color:#9CA3AF; font-size:13px; }
.htta-footer a:hover{ color:#fff; }
.htta-footer-bottom{ text-align:center; font-size:12px; color:#6B7280; margin-top:30px; padding-top:20px; border-top:1px solid #1F2937; }

/* ===== 404 / pagination ===== */
.htta-404{ text-align:center; padding:80px 20px; }
.htta-404 h1{ font-size:64px; color:var(--htta-primary); }
.htta-pagination{ display:flex; gap:6px; justify-content:center; margin:30px 0; }
.htta-pagination .page-numbers{ padding:8px 12px; border:1px solid var(--htta-border); border-radius:6px; color:var(--htta-text); }
.htta-pagination .page-numbers.current{ background:var(--htta-primary); color:#fff; border-color:var(--htta-primary); }

.htta-error{ color:var(--htta-danger); }
.htta-flashcard-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:14px; }
.htta-flashcard{ border:1px solid var(--htta-border); border-radius:10px; padding:16px; text-align:center; background:#fff; }
.htta-flashcard .hz{ font-size:24px; font-weight:700; }
.htta-flashcard .py{ color:var(--htta-primary); font-size:13px; }
.htta-flashcard .mn{ color:var(--htta-text-secondary); font-size:12px; }

/* =========================================================
   TRANG CHI TIẾT TỪ VỰNG — PHIÊN BẢN CHUYÊN NGHIỆP (vp-)
   Thiết kế: giấy ấm + thư pháp + dấu triện đỏ
   ========================================================= */
.htta-vocab-pro{
	--vp-paper:#FAF8F3; --vp-paper-2:#F3EFE6; --vp-ink:#1A1A2E;
	--vp-seal:#C8492E; --vp-seal-dark:#A53A22;
	--vp-indigo:#3B4A6B; --vp-muted:#8A8578; --vp-line:#E5E0D5;
	--vp-serif:'Noto Serif SC',serif;
	background:var(--vp-paper); color:var(--vp-ink);
	font-family:'Inter',-apple-system,Segoe UI,Roboto,sans-serif;
	margin-top:-1px;
}
.vp-container{ max-width:1080px; margin:0 auto; padding:0 24px; }

.vp-breadcrumb-wrap{ padding:18px 0 0; }
.htta-vocab-pro .htta-breadcrumb{ color:var(--vp-muted); }

/* ---------- HERO ---------- */
.vp-hero{ position:relative; overflow:hidden; padding:8px 0 44px; }
.vp-hero::before{
	content:""; position:absolute; inset:0; z-index:0;
	background:
		radial-gradient(120% 80% at 50% -10%, rgba(200,73,46,.06), transparent 60%),
		linear-gradient(180deg, var(--vp-paper) 0%, var(--vp-paper-2) 100%);
}
.vp-hero-inner{ position:relative; z-index:1; text-align:center; }
.vp-hero-meta{ display:flex; gap:8px; justify-content:center; margin-bottom:18px; }
.vp-eyebrow{
	font-size:12px; font-weight:700; letter-spacing:.12em; text-transform:uppercase;
	color:var(--vp-seal); border:1px solid rgba(200,73,46,.35);
	padding:5px 12px; border-radius:999px; background:rgba(200,73,46,.05);
}
.vp-eyebrow-soft{ color:var(--vp-muted); border-color:var(--vp-line); background:transparent; }

.vp-hero-hz{
	font-family:var(--vp-serif); font-weight:700; line-height:1;
	font-size:clamp(80px, 16vw, 150px); letter-spacing:.02em;
	color:var(--vp-ink); margin:4px 0;
	text-shadow:0 2px 0 rgba(0,0,0,.02);
}
.vp-hero-py{
	font-size:clamp(22px,4vw,30px); color:var(--vp-indigo);
	font-weight:500; letter-spacing:.04em; margin-top:6px;
}
.vp-hero-meaning{
	font-size:18px; color:var(--vp-muted); margin:10px auto 0; max-width:560px;
}

.vp-hero-actions{ display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin-top:26px; }

/* dấu triện */
.vp-seal{
	position:absolute; top:4px; right:0; z-index:1;
	width:58px; height:58px; border-radius:10px;
	background:var(--vp-seal); color:#fff; display:flex;
	align-items:center; justify-content:center;
	font-family:var(--vp-serif); font-size:28px; font-weight:700;
	box-shadow:0 6px 18px rgba(200,73,46,.3);
	transform:rotate(-6deg);
	border:2px solid rgba(255,255,255,.25);
	pointer-events:none;
}
.vp-seal::after{
	content:""; position:absolute; inset:5px; border:1px solid rgba(255,255,255,.4); border-radius:6px;
}
@media (max-width:980px){ .vp-seal{ display:none; } }

/* ---------- BUTTONS ---------- */
.vp-btn{
	display:inline-flex; align-items:center; justify-content:center; gap:8px;
	padding:12px 22px; border-radius:12px; font-size:15px; font-weight:600;
	cursor:pointer; border:1.5px solid transparent; line-height:1;
	transition:transform .12s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
	white-space:nowrap; font-family:inherit;
}
.vp-btn svg{ flex:0 0 auto; }
.vp-btn:active{ transform:translateY(1px); }
.vp-btn-primary{ background:var(--vp-seal); color:#fff; box-shadow:0 4px 14px rgba(200,73,46,.28); }
.vp-btn-primary:hover{ background:var(--vp-seal-dark); }
.vp-btn-ghost{ background:#fff; color:var(--vp-ink); border-color:var(--vp-line); }
.vp-btn-ghost:hover{ border-color:var(--vp-seal); color:var(--vp-seal); }
.vp-btn-outline{ background:transparent; color:var(--vp-ink); border-color:var(--vp-line); }
.vp-btn-outline:hover{ border-color:var(--vp-indigo); color:var(--vp-indigo); }
.vp-btn-block{ width:100%; }
.vp-save-btn.is-saved{ background:var(--vp-seal); color:#fff; border-color:var(--vp-seal); }
.vp-save-btn.is-saved .vp-ico-bookmark{ fill:#fff; }

/* ---------- BODY GRID ---------- */
.vp-body{ display:grid; grid-template-columns:1fr 300px; gap:32px; padding-top:34px; padding-bottom:20px; align-items:start; }
@media (max-width:880px){ .vp-body{ grid-template-columns:1fr; } }

/* ---------- FACTS ---------- */
.vp-facts{
	display:grid; grid-template-columns:repeat(auto-fit,minmax(96px,1fr));
	border:1px solid var(--vp-line); border-radius:16px; overflow:hidden;
	background:#fff; margin-bottom:24px;
}
.vp-fact{ padding:16px 12px; text-align:center; border-right:1px solid var(--vp-line); }
.vp-fact:last-child{ border-right:0; }
.vp-fact-label{ display:block; font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--vp-muted); margin-bottom:6px; }
.vp-fact-value{ display:block; font-size:17px; font-weight:700; color:var(--vp-ink); }

/* ---------- CARDS ---------- */
.vp-card{ background:#fff; border:1px solid var(--vp-line); border-radius:16px; padding:24px 26px; margin-bottom:20px; }
.vp-h2{ font-size:13px; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--vp-muted); margin:0 0 16px; }
.vp-card-head{ display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:18px; flex-wrap:wrap; }
.vp-card-head .vp-h2{ margin:0; }
.vp-meaning-full{ font-size:18px; line-height:1.7; margin:0; }
.vp-hint{ font-size:13px; color:var(--vp-muted); margin:16px 0 0; }

/* ---------- STROKE ORDER ---------- */
.vp-stroke-controls{ display:flex; gap:8px; }
.vp-mini-btn{
	background:var(--vp-paper-2); border:1px solid var(--vp-line); color:var(--vp-ink);
	border-radius:9px; padding:7px 13px; font-size:13px; font-weight:600; cursor:pointer; font-family:inherit;
}
.vp-mini-btn:hover{ border-color:var(--vp-seal); color:var(--vp-seal); }
.vp-stroke-grid{ display:flex; flex-wrap:wrap; gap:16px; }
.vp-stroke-cell{ display:flex; flex-direction:column; align-items:center; gap:10px; }
.vp-stroke-target{
	width:120px; height:120px; border-radius:12px;
	background:
		linear-gradient(#EFE9DC,#EFE9DC) center/100% 1px no-repeat,
		linear-gradient(#EFE9DC,#EFE9DC) center/1px 100% no-repeat,
		#fff;
	border:1px solid var(--vp-line);
	position:relative;
}
.vp-stroke-target::before, .vp-stroke-target::after{
	content:""; position:absolute; background:repeating-linear-gradient(0deg,#EFE9DC,#EFE9DC 4px,transparent 4px,transparent 8px);
}
.vp-stroke-target::before{ left:50%; top:6px; bottom:6px; width:1px; transform:translateX(-.5px); }
.vp-stroke-target::after{ top:50%; left:6px; right:6px; height:1px; transform:translateY(-.5px); }
.vp-char-audio{
	display:inline-flex; align-items:center; justify-content:center;
	width:34px; height:34px; border-radius:50%; cursor:pointer;
	background:var(--vp-indigo); color:#fff; border:none; line-height:1;
	box-shadow:0 2px 8px rgba(59,74,107,.3); transition:transform .12s ease, background .15s ease;
}
.vp-char-audio:hover{ background:#2c3a57; transform:translateY(-1px); }
.vp-char-audio svg{ display:block; }

/* ---------- EXAMPLES ---------- */
.vp-examples{ list-style:none; margin:0; padding:0; }
.vp-example{ padding:16px 0; border-bottom:1px solid var(--vp-line); }
.vp-example:first-child{ padding-top:0; }
.vp-example:last-child{ border-bottom:0; padding-bottom:0; }
.vp-example-top{ display:flex; align-items:center; gap:12px; }
.vp-example-hz{ font-family:var(--vp-serif); font-size:24px; font-weight:500; line-height:1.4; }
.vp-example-py{ color:var(--vp-indigo); font-size:14px; margin-top:5px; }
.vp-example-mn{ color:var(--vp-muted); font-size:15px; margin-top:3px; }

/* ---------- NOTE ---------- */
.vp-note{ background:#FBF6E9; border-color:#E9DCB8; }

/* ---------- ASIDE ---------- */
.vp-aside-sticky{ position:sticky; top:90px; display:flex; flex-direction:column; gap:16px; }
.vp-aside-card{ background:#fff; border:1px solid var(--vp-line); border-radius:16px; padding:18px 18px; }
.vp-aside-title{ font-size:12px; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--vp-muted); margin:0 0 14px; }
.vp-aside-card .vp-btn{ margin-bottom:10px; }
.vp-aside-card .vp-btn:last-child{ margin-bottom:0; }
@media (max-width:880px){ .vp-aside-sticky{ position:static; } }

/* ---------- SHARE ---------- */
.vp-share{ display:flex; gap:10px; }
.vp-share-btn{
	width:42px; height:42px; border-radius:12px; display:inline-flex; align-items:center; justify-content:center;
	background:var(--vp-paper-2); color:var(--vp-ink); border:1px solid var(--vp-line); cursor:pointer;
	transition:transform .12s ease, background .15s ease, color .15s ease;
}
.vp-share-btn:hover{ transform:translateY(-2px); }
.vp-share-btn[data-net="facebook"]:hover{ background:#1877F2; color:#fff; border-color:#1877F2; }
.vp-share-btn[data-net="x"]:hover{ background:#000; color:#fff; border-color:#000; }
.vp-share-btn[data-net="telegram"]:hover{ background:#229ED9; color:#fff; border-color:#229ED9; }
.vp-share-copy:hover{ background:var(--vp-indigo); color:#fff; border-color:var(--vp-indigo); }
.vp-share-copy.copied{ background:var(--vp-seal); color:#fff; border-color:var(--vp-seal); }

/* ---------- TOPIC TAGS ---------- */
.vp-topic-tags{ display:flex; flex-wrap:wrap; gap:8px; }
.vp-topic-tag{ font-size:13px; padding:6px 12px; border-radius:999px; background:var(--vp-paper-2); color:var(--vp-ink); border:1px solid var(--vp-line); }
.vp-topic-tag:hover{ border-color:var(--vp-seal); color:var(--vp-seal); }

/* ---------- RELATED ---------- */
.vp-related{ padding-top:20px; padding-bottom:8px; }
.vp-related-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
@media (max-width:880px){ .vp-related-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:520px){ .vp-related-grid{ grid-template-columns:1fr; } }
.vp-related-card{
	background:#fff; border:1px solid var(--vp-line); border-radius:14px; padding:18px;
	display:flex; flex-direction:column; gap:4px; transition:transform .12s ease, border-color .15s ease, box-shadow .15s ease;
}
.vp-related-card:hover{ transform:translateY(-2px); border-color:var(--vp-seal); box-shadow:0 8px 22px rgba(0,0,0,.05); }
.vp-related-hz{ font-family:var(--vp-serif); font-size:30px; font-weight:600; color:var(--vp-ink); line-height:1.1; }
.vp-related-py{ color:var(--vp-indigo); font-size:14px; }
.vp-related-mn{ color:var(--vp-muted); font-size:14px; }

/* ---------- BACK ---------- */
.vp-back{ padding-top:18px; padding-bottom:48px; }
.vp-back-link{ color:var(--vp-muted); font-weight:600; font-size:14px; }
.vp-back-link:hover{ color:var(--vp-seal); }

/* ---------- FLASHCARD MODAL ---------- */
.vp-modal{ position:fixed; inset:0; z-index:1000; display:flex; align-items:center; justify-content:center; padding:20px; }
.vp-modal[hidden]{ display:none; }
.vp-modal-backdrop{ position:absolute; inset:0; background:rgba(26,26,46,.55); backdrop-filter:blur(2px); }
.vp-modal-box{ position:relative; z-index:1; background:var(--vp-paper); border-radius:22px; padding:32px 28px 26px; width:100%; max-width:420px; box-shadow:0 24px 60px rgba(0,0,0,.3); }
.vp-modal-close{ position:absolute; top:14px; right:16px; background:none; border:none; font-size:26px; line-height:1; color:var(--vp-muted); cursor:pointer; }
.vp-modal-close:hover{ color:var(--vp-ink); }

.vp-flashcard{ perspective:1200px; cursor:pointer; }
.vp-flashcard-inner{ position:relative; width:100%; min-height:260px; transition:transform .55s cubic-bezier(.4,.2,.2,1); transform-style:preserve-3d; }
.vp-flashcard.flipped .vp-flashcard-inner{ transform:rotateY(180deg); }
.vp-flashcard-front, .vp-flashcard-back{
	position:absolute; inset:0; backface-visibility:hidden;
	display:flex; flex-direction:column; align-items:center; justify-content:center; gap:14px;
	background:#fff; border:1px solid var(--vp-line); border-radius:18px; padding:24px;
}
.vp-flashcard-back{ transform:rotateY(180deg); }
.vp-flashcard-hz{ font-family:var(--vp-serif); font-size:72px; font-weight:700; line-height:1; }
.vp-flashcard-tap{ font-size:13px; color:var(--vp-muted); }
.vp-flashcard-py{ font-size:24px; color:var(--vp-indigo); font-weight:500; }
.vp-flashcard-mn{ font-size:19px; text-align:center; }
.vp-flashcard-hint{ text-align:center; font-size:13px; color:var(--vp-muted); margin:16px 0 0; }

/* ---------- HANZI WRITER quiz overlay tweaks ---------- */
.vp-stroke-target svg{ border-radius:12px; }

/* reduce motion */
@media (prefers-reduced-motion:reduce){
	.vp-btn, .vp-share-btn, .vp-related-card, .vp-char-audio{ transition:none; }
	.vp-flashcard-inner{ transition:none; }
}

/* ---- Ghi đè rule .htta-audio-btn cũ cho các nút trong trang chuyên nghiệp ---- */
.htta-vocab-pro .vp-btn.htta-audio-btn,
.vp-modal .vp-btn.htta-audio-btn{
	width:auto; height:auto; border-radius:12px;
	background:var(--vp-seal); color:#fff;
	padding:12px 22px; font-size:15px; font-weight:600;
	display:inline-flex; align-items:center; justify-content:center; gap:8px;
}
.htta-vocab-pro .vp-btn-primary.htta-audio-btn:hover{ background:var(--vp-seal-dark); }

.htta-vocab-pro .vp-char-audio.htta-audio-btn{
	width:34px; height:34px; border-radius:50%;
	background:var(--vp-indigo); color:#fff;
	display:inline-flex; align-items:center; justify-content:center;
	box-shadow:0 2px 8px rgba(59,74,107,.3);
}
.htta-vocab-pro .vp-char-audio.htta-audio-btn:hover{ background:#2c3a57; }

.vp-modal .vp-mini-btn.htta-audio-btn{
	width:auto; height:auto; border-radius:9px;
	background:var(--vp-paper-2); color:var(--vp-ink);
	border:1px solid var(--vp-line); padding:8px 16px; font-size:14px; font-weight:600;
}
.vp-modal .vp-mini-btn.htta-audio-btn:hover{ border-color:var(--vp-seal); color:var(--vp-seal); }

/* ---- Trạng thái đang tải audio: làm mờ + spinner, KHÔNG xóa nội dung nút ---- */
.htta-audio-btn.is-loading{ position:relative; opacity:.65; pointer-events:none; }
.htta-audio-btn.is-loading::after{
	content:""; position:absolute; top:50%; left:50%;
	width:16px; height:16px; margin:-8px 0 0 -8px;
	border:2px solid rgba(255,255,255,.55); border-top-color:#fff;
	border-radius:50%; animation:htta-spin .7s linear infinite;
}
/* Với nút nền sáng (char audio xanh, nút lớn đỏ) spinner trắng hợp; nếu nút nền nhạt thì dùng màu mực */
.vp-btn-ghost.htta-audio-btn.is-loading::after,
.vp-mini-btn.htta-audio-btn.is-loading::after{
	border-color:rgba(26,26,46,.25); border-top-color:var(--vp-ink,#1A1A2E);
}
@keyframes htta-spin{ to{ transform:rotate(360deg); } }
@media (prefers-reduced-motion:reduce){ .htta-audio-btn.is-loading::after{ animation:none; } }

/* ---- Thống kê lượt xem / lần nghe ở hero ---- */
.htta-vocab-pro .vp-hero-stats{
	display:flex; gap:18px; justify-content:center; flex-wrap:wrap; margin-top:16px;
}
.htta-vocab-pro .vp-stat{
	display:inline-flex; align-items:center; gap:6px;
	font-size:13px; color:var(--vp-muted);
}
.htta-vocab-pro .vp-stat svg{ opacity:.7; }

/* ---- Nút "Đã thuộc" ---- */
.htta-vocab-pro .vp-learned-btn.is-learned{
	background:#10B981; color:#fff; border-color:#10B981;
}
.htta-vocab-pro .vp-learned-btn.is-learned .vp-ico-check{ stroke:#fff; }

/* ---- Điều hướng Từ trước / Từ sau ---- */
.htta-vocab-pro .vp-pager{
	display:grid; grid-template-columns:1fr 1fr; gap:14px;
	padding-top:24px; padding-bottom:6px;
}
.htta-vocab-pro .vp-pager-link{
	display:flex; flex-direction:column; gap:4px;
	background:#fff; border:1px solid var(--vp-line); border-radius:14px;
	padding:16px 18px; transition:transform .12s ease, border-color .15s ease, box-shadow .15s ease;
}
.htta-vocab-pro .vp-pager-link:hover{ transform:translateY(-2px); border-color:var(--vp-seal); box-shadow:0 8px 22px rgba(0,0,0,.05); }
.htta-vocab-pro .vp-pager-next{ text-align:right; align-items:flex-end; }
.htta-vocab-pro .vp-pager-dir{ font-size:12px; font-weight:600; letter-spacing:.04em; color:var(--vp-muted); text-transform:uppercase; }
.htta-vocab-pro .vp-pager-hz{ font-family:var(--vp-serif); font-size:26px; font-weight:600; color:var(--vp-ink); line-height:1.1; }
.htta-vocab-pro .vp-pager-py{ font-size:13px; color:var(--vp-indigo); }
@media (max-width:520px){
	.htta-vocab-pro .vp-pager{ grid-template-columns:1fr; }
	.htta-vocab-pro .vp-pager-next{ text-align:left; align-items:flex-start; }
}

/* ===== Ngữ pháp (single-htta_grammar) ===== */
.vp-body-narrow{ grid-template-columns:1fr !important; max-width:760px; }
.vp-grammar-title{ font-size:clamp(28px,5vw,40px); font-weight:800; margin:6px 0; color:var(--vp-ink); }
.vp-grammar-structure{
	display:inline-block; font-family:var(--vp-serif); font-size:24px; font-weight:600;
	background:#fff; border:1.5px dashed var(--vp-seal); color:var(--vp-ink);
	padding:12px 22px; border-radius:12px; margin-top:8px;
}

/* ===== Hội thoại (single-htta_dialogue) ===== */
.vp-chat{ display:flex; flex-direction:column; gap:16px; }
.vp-chat-row{ display:flex; gap:10px; align-items:flex-end; max-width:80%; }
.vp-chat-left{ align-self:flex-start; }
.vp-chat-right{ align-self:flex-end; flex-direction:row-reverse; }
.vp-chat-avatar{
	flex:0 0 auto; width:38px; height:38px; border-radius:50%;
	display:flex; align-items:center; justify-content:center;
	font-weight:700; font-size:15px; color:#fff; background:var(--vp-indigo);
}
.vp-chat-right .vp-chat-avatar{ background:var(--vp-seal); }
.vp-chat-bubble{
	background:#fff; border:1px solid var(--vp-line); border-radius:16px;
	padding:12px 16px;
}
.vp-chat-left .vp-chat-bubble{ border-bottom-left-radius:4px; }
.vp-chat-right .vp-chat-bubble{ border-bottom-right-radius:4px; background:#F2F4FB; }
.vp-chat-hz{ font-family:var(--vp-serif); font-size:21px; font-weight:500; line-height:1.5; display:flex; align-items:center; gap:8px; flex-wrap:wrap; }
.vp-chat-py{ color:var(--vp-indigo); font-size:13px; margin-top:4px; }
.vp-chat-mn{ color:var(--vp-muted); font-size:14px; margin-top:2px; }
.vp-chat-bubble .vp-char-audio{ width:28px; height:28px; box-shadow:none; }
@media (max-width:600px){ .vp-chat-row{ max-width:92%; } }

/* ===== Single HSK Test page ===== */
.httat-test-hero-meta{ display:flex; flex-wrap:wrap; gap:8px; margin-top:12px; }