/*
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: 1.0.0
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; }

/* ===== 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{ background:#fff; border:1px solid var(--htta-border); border-radius:var(--htta-radius); padding:18px; text-align:center; }
.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-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; }

/* ===== 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; }