/*
Theme Name: Lumen
Theme URI: https://huydev.local/lumen/
Author: HuyDev
Author URI: https://huydev.local/
Description: A minimalist, reading-focused blog theme. Single centered column, elegant serif typography, generous whitespace, one warm accent. No page builder, no framework.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: lumen
Tags: blog, minimalist, one-column, custom-menu, featured-images, translation-ready
*/

/* ---------------------------------------------------------------
   Design tokens
--------------------------------------------------------------- */
:root{
    --ink: #1c1b19;
    --ink-soft: #4a4843;
    --muted: #8b8880;
    --line: #e7e3db;
    --paper: #fbfaf7;
    --paper-2: #f3f0e9;
    --accent: #b5502a;
    --accent-soft: #f0e2d9;

    --serif: "Fraunces", "Georgia", "Times New Roman", serif;
    --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    --measure: 42rem;      /* reading column ~672px */
    --wide: 60rem;         /* wider wrapper */
    --radius: 10px;
    --gap: clamp(1.25rem, 4vw, 2.5rem);
}

/* ---------------------------------------------------------------
   Reset & base
--------------------------------------------------------------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body{
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 1.0625rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
img{ max-width: 100%; height: auto; display: block; }
a{ color: var(--accent); text-decoration: none; }
a:hover{ text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3, h4{ font-family: var(--serif); font-weight: 600; line-height: 1.2; color: var(--ink); }
::selection{ background: var(--accent-soft); }

.wrap{ width: 100%; max-width: var(--measure); margin-inline: auto; padding-inline: 1.5rem; }
.wrap-wide{ max-width: var(--wide); }
.eyebrow{
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
}
.skip-link{ position: absolute; left: -9999px; }
.skip-link:focus{ left: 1rem; top: 1rem; background: var(--ink); color: #fff; padding: .5rem 1rem; border-radius: 6px; z-index: 100; }

/* ---------------------------------------------------------------
   Header / masthead
--------------------------------------------------------------- */
.site-header{
    border-bottom: 1px solid var(--line);
    background: var(--paper);
}
.masthead{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 1.4rem;
}
.site-branding .site-title{
    margin: 0;
    font-size: 1.5rem;
    letter-spacing: -0.01em;
}
.site-branding .site-title a{ color: var(--ink); text-decoration: none; }
.site-branding .site-title a:hover{ color: var(--accent); }
.site-branding .site-tagline{
    margin: 2px 0 0;
    font-family: var(--sans);
    font-size: 0.82rem;
    color: var(--muted);
}

.primary-nav ul{
    display: flex;
    align-items: center;
    gap: 1.6rem;
    margin: 0; padding: 0;
    list-style: none;
}
.primary-nav a{
    font-family: var(--sans);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-soft);
    text-decoration: none;
}
.primary-nav a:hover,
.primary-nav .current-menu-item > a{ color: var(--accent); }

.nav-toggle{
    display: none;
    background: none;
    border: 1px solid var(--line);
    border-radius: 8px;
    width: 42px; height: 42px;
    font-size: 1.1rem;
    color: var(--ink);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

/* ---------------------------------------------------------------
   Home / archive intro
--------------------------------------------------------------- */
.page-intro{
    text-align: center;
    padding-block: clamp(2.5rem, 7vw, 4.5rem) 1rem;
}
.page-intro h1{
    font-size: clamp(2rem, 5vw, 2.9rem);
    margin: 0.4rem 0 0;
    letter-spacing: -0.02em;
}
.page-intro p{
    margin: 0.9rem auto 0;
    max-width: 34rem;
    color: var(--ink-soft);
}

/* ---------------------------------------------------------------
   Post list
--------------------------------------------------------------- */
.post-feed{
    padding-block: 1.5rem 3rem;
    display: grid;
    gap: clamp(2.25rem, 5vw, 3.25rem);
}
.post-card{
    padding-bottom: clamp(2.25rem, 5vw, 3.25rem);
    border-bottom: 1px solid var(--line);
}
.post-feed > .post-card:last-child{ border-bottom: none; padding-bottom: 0; }

.post-card-media{
    display: block;
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.4rem;
    aspect-ratio: 16 / 9;
    background: var(--paper-2);
}
.post-card-media img{
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}
.post-card-media:hover img{ transform: scale(1.04); }

.post-card-meta{
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--sans);
    font-size: 0.78rem;
    color: var(--muted);
    margin-bottom: 0.6rem;
}
.post-card-meta .dot{ width: 3px; height: 3px; border-radius: 50%; background: var(--muted); }

.post-card-title{
    font-size: clamp(1.5rem, 3.4vw, 1.95rem);
    margin: 0 0 0.6rem;
    letter-spacing: -0.01em;
}
.post-card-title a{ color: var(--ink); text-decoration: none; }
.post-card-title a:hover{ color: var(--accent); }
.post-card-excerpt{ margin: 0 0 1rem; color: var(--ink-soft); }
.read-link{
    font-family: var(--sans);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}
.read-link .arrow{ transition: transform .2s ease; }
.read-link:hover{ text-decoration: none; }
.read-link:hover .arrow{ transform: translateX(4px); }

/* ---------------------------------------------------------------
   Pagination
--------------------------------------------------------------- */
.pagination{
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    padding-bottom: 3.5rem;
    font-family: var(--sans);
}
.pagination .page-numbers{
    min-width: 42px;
    padding: 0.55rem 0.75rem;
    text-align: center;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink-soft);
    font-size: 0.9rem;
    text-decoration: none;
}
.pagination .page-numbers.current,
.pagination .page-numbers:hover{
    background: var(--ink);
    border-color: var(--ink);
    color: var(--paper);
}

/* ---------------------------------------------------------------
   Single / page
--------------------------------------------------------------- */
.entry-header{
    text-align: center;
    padding-block: clamp(2.5rem, 7vw, 4rem) 0;
}
.entry-header .entry-title{
    font-size: clamp(2rem, 5vw, 3rem);
    margin: 0.6rem 0 0;
    letter-spacing: -0.02em;
}
.entry-meta{
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1.1rem;
    font-family: var(--sans);
    font-size: 0.82rem;
    color: var(--muted);
}
.entry-meta .dot{ width: 3px; height: 3px; border-radius: 50%; background: var(--muted); }

.featured-media{
    margin: clamp(2rem, 5vw, 3rem) 0 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.entry-content{
    padding-block: clamp(2rem, 5vw, 2.75rem) 0;
    font-size: 1.13rem;
    line-height: 1.8;
    color: var(--ink-soft);
}
.entry-content > * + *{ margin-top: 1.4rem; }
.entry-content p{ margin: 0; }
.entry-content h2{ font-size: 1.7rem; margin-top: 2.6rem; color: var(--ink); }
.entry-content h3{ font-size: 1.35rem; margin-top: 2.2rem; color: var(--ink); }
.entry-content a{ text-decoration: underline; text-underline-offset: 3px; }
.entry-content img,
.entry-content figure{ border-radius: var(--radius); margin-block: 2rem; }
.entry-content ul, .entry-content ol{ padding-left: 1.3rem; }
.entry-content li + li{ margin-top: 0.5rem; }
.entry-content blockquote{
    margin: 2rem 0;
    padding: 0.4rem 0 0.4rem 1.4rem;
    border-left: 3px solid var(--accent);
    font-family: var(--serif);
    font-style: italic;
    font-size: 1.3rem;
    color: var(--ink);
}
.entry-content code{
    background: var(--paper-2);
    padding: 0.15em 0.4em;
    border-radius: 5px;
    font-size: 0.9em;
}
.entry-content pre{
    background: var(--ink);
    color: #f5f2ec;
    padding: 1.2rem 1.4rem;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.92rem;
    line-height: 1.6;
}
.entry-content pre code{ background: none; padding: 0; }
.entry-content hr{ border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }

.entry-tags{
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding-block: 2.25rem;
    margin-top: 2rem;
    border-top: 1px solid var(--line);
}
.entry-tags a{
    font-family: var(--sans);
    font-size: 0.78rem;
    color: var(--ink-soft);
    background: var(--paper-2);
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    text-decoration: none;
}
.entry-tags a:hover{ background: var(--accent); color: #fff; }

/* Post navigation */
.post-nav{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding-block: 2rem;
    border-top: 1px solid var(--line);
    font-family: var(--sans);
}
.post-nav a{ color: var(--ink); text-decoration: none; }
.post-nav .nav-label{ font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.post-nav .nav-title{ font-family: var(--serif); font-weight: 600; margin-top: 0.3rem; display: block; }
.post-nav a:hover .nav-title{ color: var(--accent); }
.post-nav .next{ text-align: right; }

/* ---------------------------------------------------------------
   Author card
--------------------------------------------------------------- */
.author-card{
    display: flex;
    gap: 1.1rem;
    align-items: flex-start;
    padding: 1.5rem;
    background: var(--paper-2);
    border-radius: var(--radius);
    margin-block: 2.5rem;
}
.author-card img{ width: 56px; height: 56px; border-radius: 50%; flex: none; }
.author-card .author-name{ font-family: var(--serif); font-weight: 600; color: var(--ink); }
.author-card .author-bio{ font-size: 0.92rem; color: var(--ink-soft); margin-top: 0.2rem; }

/* ---------------------------------------------------------------
   Comments
--------------------------------------------------------------- */
.comments-area{ padding-block: 1rem 3rem; }
.comments-title{ font-size: 1.5rem; margin-bottom: 1.6rem; }
.comment-list{ list-style: none; margin: 0 0 2.5rem; padding: 0; }
.comment-list ul.children{ list-style: none; margin-left: 1.5rem; padding-left: 1rem; border-left: 1px solid var(--line); }
.comment-body{ padding: 1.1rem 0; }
.comment-meta{ display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.5rem; }
.comment-meta img{ width: 40px; height: 40px; border-radius: 50%; }
.comment-meta .fn{ font-weight: 600; font-style: normal; color: var(--ink); font-family: var(--sans); font-size: 0.92rem; }
.comment-meta .comment-date{ font-size: 0.76rem; color: var(--muted); font-family: var(--sans); }
.comment-content{ color: var(--ink-soft); font-size: 0.98rem; }
.comment-content p{ margin: 0 0 0.6rem; }
.comment .reply a{ font-family: var(--sans); font-size: 0.74rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; }

.comment-respond{
    background: var(--paper-2);
    border-radius: var(--radius);
    padding: clamp(1.5rem, 4vw, 2.25rem);
}
.comment-reply-title{ font-size: 1.35rem; margin: 0 0 0.4rem; }
.comment-notes, .logged-in-as{ font-family: var(--sans); font-size: 0.85rem; color: var(--muted); margin: 0 0 1.4rem; }
.comment-form p{ margin: 0 0 1.1rem; }
.comment-form label{ display: block; font-family: var(--sans); font-size: 0.8rem; font-weight: 600; margin-bottom: 0.4rem; }
.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea{
    width: 100%;
    font-family: var(--sans);
    font-size: 1rem;
    color: var(--ink);
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0.7rem 0.85rem;
}
.comment-form input:focus,
.comment-form textarea:focus{ outline: none; border-color: var(--accent); }
.comment-form textarea{ min-height: 130px; resize: vertical; }
.comment-form .form-submit{ margin-bottom: 0; }
.comment-form .submit{
    font-family: var(--sans);
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--ink);
    color: var(--paper);
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.6rem;
    cursor: pointer;
    transition: background .2s ease;
}
.comment-form .submit:hover{ background: var(--accent); }

/* ---------------------------------------------------------------
   404 / empty
--------------------------------------------------------------- */
.state-empty{ text-align: center; padding-block: clamp(3.5rem, 10vw, 7rem); }
.state-empty h1{ font-size: clamp(3rem, 12vw, 6rem); color: var(--accent); margin: 0; }
.state-empty p{ color: var(--ink-soft); margin: 0.6rem 0 1.6rem; }
.btn{
    display: inline-block;
    font-family: var(--sans);
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--ink);
    color: var(--paper);
    padding: 0.75rem 1.6rem;
    border-radius: 8px;
    text-decoration: none;
}
.btn:hover{ background: var(--accent); text-decoration: none; }

/* ---------------------------------------------------------------
   Footer
--------------------------------------------------------------- */
.site-footer{
    border-top: 1px solid var(--line);
    padding-block: 2.5rem;
    margin-top: 2rem;
}
.footer-inner{
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-family: var(--sans);
    font-size: 0.82rem;
    color: var(--muted);
}
.footer-social{ display: flex; gap: 1rem; }
.footer-social a{ color: var(--ink-soft); }
.footer-social a:hover{ color: var(--accent); }

/* Back to top */
.to-top{
    position: fixed;
    right: 1.5rem; bottom: 1.5rem;
    width: 44px; height: 44px;
    display: none;
    align-items: center;
    justify-content: center;
    background: var(--ink);
    color: var(--paper);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    opacity: 0.92;
}
.to-top:hover{ background: var(--accent); }
.to-top.show{ display: flex; }

/* Search form */
.search-form{ display: flex; gap: 0.5rem; }
.search-form input[type="search"]{
    flex: 1;
    font-family: var(--sans);
    font-size: 1rem;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
}
.search-form input[type="search"]:focus{ outline: none; border-color: var(--accent); }
.search-form button{
    background: var(--ink);
    color: var(--paper);
    border: none;
    border-radius: 8px;
    padding: 0 1.1rem;
    cursor: pointer;
}

/* ---------------------------------------------------------------
   Responsive
--------------------------------------------------------------- */
@media (max-width: 640px){
    .nav-toggle{ display: inline-flex; }
    .primary-nav{
        position: fixed;
        inset: 0 0 0 auto;
        width: min(78vw, 320px);
        background: var(--paper);
        border-left: 1px solid var(--line);
        transform: translateX(100%);
        transition: transform .28s ease;
        padding: 5rem 2rem 2rem;
        z-index: 60;
    }
    .primary-nav.open{ transform: translateX(0); }
    .primary-nav ul{ flex-direction: column; align-items: flex-start; gap: 1.2rem; }
    .primary-nav a{ font-size: 1rem; }
    .post-nav{ grid-template-columns: 1fr; }
    .post-nav .next{ text-align: left; }
}