/*
Theme Name: Rai One
Theme URI: https://example.com/
Author: Giang Do Tien
Description: Theme tối giản chuẩn SEO dành cho WordPress.
Version: 1.0
Text Domain: rai
*/

/* -------------------------------------------------------
   CSS VARIABLES — Màu sắc & giá trị tái sử dụng
------------------------------------------------------- */
:root {
    --color-text: #222;
    --color-muted: #666;
    --color-meta: #777;
    --color-border: #eee;
    --color-border-hover: #ddd;
    --color-bg: #fff;
    --color-bg-soft: #f7f7f7;
    --color-primary: #333;
    --color-heading: #111;
    --radius: 6px;
    --transition: 0.2s ease;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-soft: 0 3px 10px rgba(0,0,0,0.05);
    --container-max: 1200px;
}

/* -------------------------------------------------------
   RESET CSS
------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; }
body { font-family: Arial, Helvetica, sans-serif; font-size: 16px; line-height: 1.6; color: var(--color-text); background: var(--color-bg); }

/* -------------------------------------------------------
   LAYOUT CHUNG
------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 16px;
}
.site-header {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.logo img { height: 40px; }
.site-main { padding: 40px 0; }
.site-footer {
    padding: 20px 0;
    text-align: center;
    font-size: 14px;
    color: var(--color-muted);
    border-top: 1px solid var(--color-border);
}

/* -------------------------------------------------------
   MENU
------------------------------------------------------- */
.main-nav .menu { display: flex; gap: 24px; }
.main-nav .menu a { padding: 6px 0; }

/* Mobile menu toggle */
.menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }
.mobile-menu,
.overlay { display: none; }

@media (max-width: 768px) {
    .main-nav { display: none; }
    .menu-toggle { display: block; }
    .mobile-menu {
        display: block;
        position: fixed;
        top: 0;
        right: -80%;
        width: 80%;
        height: 100vh;
        padding: 24px;
        background: var(--color-bg);
        box-shadow: -2px 0 8px rgba(0,0,0,0.15);
        transition: right 0.3s ease;
        z-index: 2000;
    }
    .mobile-menu.open { right: 0; }
    .mobile-menu .close-menu {
        font-size: 32px; background: none; border: none; cursor: pointer; margin-bottom: 16px;
    }
    .menu-mobile li { margin-bottom: 16px; }
    .overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        opacity: 0;
        visibility: hidden;
        transition: 0.3s;
        z-index: 1500;
    }
    .overlay.active { opacity: 1; visibility: visible; }
}

/* -------------------------------------------------------
   POST LIST / INDEX
------------------------------------------------------- */
.post-list {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.post-item {
    border: 1px solid var(--color-border);
    padding: 16px;
    border-radius: var(--radius);
    transition: var(--transition);
}
.post-item:hover { box-shadow: var(--shadow); }
.post-thumbnail img { margin-bottom: 12px; }
.post-title { font-size: 20px; font-weight: bold; margin-bottom: 10px; }
.post-excerpt { font-size: 15px; color: var(--color-muted); margin-bottom: 10px; }

/* -------------------------------------------------------
   PAGINATION
------------------------------------------------------- */
.nav-links {
    display: flex; gap: 8px; justify-content: center; margin-top: 40px;
}
.page-numbers {
    display: inline-block;
    padding: 8px 14px;
    font-size: 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
}
.page-numbers:hover { background: var(--color-bg-soft); border-color: var(--color-border-hover); box-shadow: var(--shadow-soft); }
.page-numbers.current { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.page-numbers.dots { border: none; padding: 8px 6px; box-shadow: none; }
.page-numbers.prev, .page-numbers.next { font-weight: bold; }

/* -------------------------------------------------------
   SINGLE ARTICLE
------------------------------------------------------- */
.single-content { max-width: 720px; margin: 0 auto; }
.single-title { font-size: 32px; margin-bottom: 16px; font-weight: bold; color: var(--color-heading); }
.single-meta { font-size: 14px; color: var(--color-meta); margin-bottom: 20px; }
.single-thumbnail img { margin-bottom: 24px; }
.single-body { font-size: 18px; line-height: 1.8; }
.single-body p { margin-bottom: 18px; }
.single-body h2 { font-size: 26px; margin: 32px 0 16px; }
.single-body h3 { font-size: 22px; margin: 24px 0 12px; }
.single-body ul, .single-body ol { margin-left: 20px; margin-bottom: 18px; }
.single-body img { margin: 24px auto; }

/* -------------------------------------------------------
   COMMENTS
------------------------------------------------------- */
.comments-area {
    padding-top: 30px; max-width: 720px; margin: 0 auto;
}
.comments-title { font-size: 22px; font-weight: bold; margin-bottom: 20px; color: var(--color-heading); }
.comment-list { list-style: none; margin: 0; padding: 0; }
.comment { margin-bottom: 24px; }
.comment .children { margin-left: 24px; border-left: 2px solid var(--color-border); padding-left: 16px; }
.comment-body { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--color-border); }
.comment-meta { margin-bottom: 6px; }
.comment .avatar { width: 48px; height: 48px; border-radius: 50%; }
.comment-author { font-weight: bold; color: var(--color-heading); }
.comment-author a { color: var(--color-heading); }
.comment-metadata { font-size: 13px; color: var(--color-muted); }
.comment-metadata a { color: var(--color-muted); }
.comment-content { font-size: 16px; line-height: 1.6; color: var(--color-text); }
.comment-content p { margin-bottom: 12px; }
.reply .comment-reply-link {
    display: inline-block; margin-top: 8px; padding: 6px 12px;
    font-size: 14px; border-radius: var(--radius); background: var(--color-primary);
    color: #fff; transition: var(--transition);
}
.reply .comment-reply-link:hover { opacity: 0.85; }
.comment-respond { padding-top: 30px; border-top: 1px solid var(--color-border); }
.comment-reply-title { font-size: 20px; font-weight: bold; margin-bottom: 16px; color: var(--color-heading); }
.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
    width: 100%; padding: 10px 12px; border: 1px solid var(--color-border);
    border-radius: var(--radius); background: var(--color-bg); font-size: 15px; color: var(--color-text);
    margin-bottom: 12px; transition: border var(--transition);
}
.comment-form textarea { min-height: 140px; }
.comment-form input:focus, .comment-form textarea:focus { border-color: var(--color-border-hover); outline: none; }
.comment-form input[type="submit"] {
    padding: 10px 22px; background: var(--color-primary); color: #fff;
    border: none; border-radius: var(--radius); cursor: pointer; font-weight: bold; transition: var(--transition);
}
.comment-form input[type="submit"]:hover { opacity: 0.85; }

/* -------------------------------------------------------
   BREADCRUMB — Rank Math
------------------------------------------------------- */
.rank-math-breadcrumb {
    margin: 32px 0 24px; font-size: 14px; color: var(--color-muted);
    display: flex; flex-wrap: wrap; gap: 4px;
}
.rank-math-breadcrumb a { color: var(--color-primary); text-decoration: none; }
.rank-math-breadcrumb a:hover { opacity: 0.8; }
.rank-math-breadcrumb .separator { color: var(--color-border-hover); }
.rank-math-breadcrumb .last { font-weight: 600; color: var(--color-heading); }

/* -------------------------------------------------------
   RELATED POSTS
------------------------------------------------------- */
.related-posts { border-top: 1px solid var(--color-border); padding-top: 10px; }
.related-title { font-size: 20px; font-weight: 600; margin-bottom: 24px; color: var(--color-heading); }
.related-grid {
    display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.related-item a { display: block; color: var(--color-heading); transition: var(--transition); }
.related-item-title { font-size: 16px; margin-top: 12px; line-height: 1.4; font-weight: 500; }
.related-item-title:hover { color: var(--color-primary); }

/* -------------------------------------------------------
   POST TAGS
------------------------------------------------------- */
.post-tags {
    margin: 20px 0; font-size: 15px; color: var(--color-meta);
    display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px;
}
.post-tags strong { margin-right: 8px; color: var(--color-heading); }
.post-tags ul { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.post-tags li a {
    display: inline-block; padding: 4px 10px; background: #f3f3f3; border-radius: 4px;
    font-size: 14px; text-decoration: none; transition: var(--transition);
}
.post-tags li a:hover { background: #e5e5e5; }