/*
Theme Name: AlgorithmDevZ Hub
Theme URI: https://xi0.in
Author: AlgorithmDevZ
Author URI: https://t.me/algorithmdevZ
Description: High-performance personal hub with compact two-column article + comments layout.
Version: 1.2.0
Requires at least: 5.9
Tested up to: 6.5
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: algorithmdevz
Tags: blog, dark-mode, custom-header, custom-logo
*/

/* ════════════════════════════════════════
   DESIGN TOKENS
════════════════════════════════════════ */
:root {
    --sp-font:        'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --sp-mono:        ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;

    /* Light */
    --sp-bg:          #f6f8fa;
    --sp-bg-alt:      #ffffff;
    --sp-text:        #111827;
    --sp-muted:       #6b7280;
    --sp-light:       #9ca3af;
    --sp-border:      #e5e7eb;
    --sp-accent:      #06b6d4;
    --sp-accent-dk:   #0891b2;
    --sp-card:        #ffffff;
    --sp-nav-bg:      rgba(246,248,250,0.9);
    --sp-code-bg:     #f3f4f6;
    --sp-sidebar-bg:  #ffffff;

    --sp-wrap:        1200px;
    --sp-nav-h:       42px;
    --sp-art-col:     minmax(0,1fr);
    --sp-side-col:    320px;
    --sp-gap:         20px;
}
html.dark {
    --sp-bg:          #0a0a0a;
    --sp-bg-alt:      #111111;
    --sp-text:        #e5e7eb;
    --sp-muted:       #9ca3af;
    --sp-light:       #6b7280;
    --sp-border:      rgba(255,255,255,0.09);
    --sp-accent:      #22d3ee;
    --sp-accent-dk:   #06b6d4;
    --sp-card:        #141414;
    --sp-nav-bg:      rgba(10,10,10,0.92);
    --sp-code-bg:     #1a1a1a;
    --sp-sidebar-bg:  #111111;
}

/* ════════════════════════════════════════
   RESET + BASE
════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
html, body {
    font-family: var(--sp-font);
    background: var(--sp-bg);
    color: var(--sp-text);
    font-size: 14px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { color: var(--sp-accent); text-decoration: none; }
a:hover { color: var(--sp-accent-dk); }
img { max-width: 100%; height: auto; display: block; }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--sp-border); border-radius: 4px; }

/* ════════════════════════════════════════
   WRAPPER
════════════════════════════════════════ */
.sp-wrap {
    max-width: var(--sp-wrap);
    width: 100%;
    margin: 0 auto;
    padding: 0 1.125rem;
}

/* ════════════════════════════════════════
   NAV
════════════════════════════════════════ */
.sp-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--sp-nav-h);
    background: var(--sp-nav-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--sp-border);
}
.sp-nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}
.sp-nav-brand {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    text-decoration: none;
    flex-shrink: 0;
}
.sp-brand-ico {
    width: 24px; height: 24px;
    border-radius: 5px;
    border: 1px solid var(--sp-border);
    object-fit: cover;
}
.sp-brand-name {
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    background: linear-gradient(90deg,#ff6b6b,#ffd93d,#6bcb77,#4d96ff,#c77dff,#ff6b6b);
    background-size: 300%;
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rainbowShift 8s linear infinite;
}
.sp-nav-right { display: flex; align-items: center; gap: 0.5rem; }
.sp-nav-back {
    display: flex; align-items: center; gap: 0.2rem;
    font-size: 0.65rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.1em;
    color: var(--sp-muted); text-decoration: none;
    transition: color 0.15s;
}
.sp-nav-back:hover { color: var(--sp-text); }
.sp-nav-back svg { width: 12px; height: 12px; flex-shrink: 0; }
.sp-theme-btn {
    width: 28px; height: 28px;
    border-radius: 50%;
    border: 1px solid var(--sp-border);
    background: transparent;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    color: var(--sp-muted);
    transition: background 0.15s, color 0.15s;
}
.sp-theme-btn:hover { background: var(--sp-card); color: var(--sp-text); }
.sp-theme-btn svg { width: 13px; height: 13px; }

/* ════════════════════════════════════════
   BREADCRUMB
════════════════════════════════════════ */
.sp-breadcrumb { border-bottom: 1px solid var(--sp-border); background: var(--sp-bg); }
.sp-bc-inner {
    display: flex; align-items: center; gap: 0.3rem; flex-wrap: wrap;
    padding-top: 0.45rem; padding-bottom: 0.45rem;
    font-size: 0.6rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--sp-light);
}
.sp-bc-inner a { color: var(--sp-muted); transition: color 0.15s; }
.sp-bc-inner a:hover { color: var(--sp-accent); }
.sp-bc-inner span { opacity: 0.45; }
.sp-bc-current { color: var(--sp-muted); }

/* ════════════════════════════════════════
   TWO-COLUMN LAYOUT
════════════════════════════════════════ */
.sp-layout {
    display: grid;
    grid-template-columns: var(--sp-art-col) var(--sp-side-col);
    gap: var(--sp-gap);
    align-items: start;
    padding-top: 1rem;
    padding-bottom: 2.5rem;
}

/* ════════════════════════════════════════
   LEFT: ARTICLE
════════════════════════════════════════ */
.sp-main { min-width: 0; }

.sp-article {
    background: var(--sp-card);
    border: 1px solid var(--sp-border);
    border-radius: 12px;
    overflow: hidden;
}

/* Hero image */
.sp-hero {
    width: 100%;
    aspect-ratio: 16/8;
    overflow: hidden;
    background: var(--sp-code-bg);
}
.sp-hero img {
    width: 100%; height: 100%;
    object-fit: cover; display: block;
    transition: transform 0.5s ease;
}
.sp-article:hover .sp-hero img { transform: scale(1.015); }

/* Header block */
.sp-header { padding: 0.875rem 1rem 0; }

.sp-cat {
    display: inline-flex; align-items: center; gap: 0.3rem;
    padding: 0.18rem 0.55rem;
    border-radius: 999px;
    background: rgba(6,182,212,0.1);
    color: var(--sp-accent);
    font-size: 0.58rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.18em;
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: background 0.15s;
}
.sp-cat:hover { background: rgba(6,182,212,0.2); color: var(--sp-accent); }
.sp-cat-dot {
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--sp-accent);
    animation: pulse 2s ease infinite;
    flex-shrink: 0;
}

.sp-title {
    font-size: clamp(1.15rem, 2.5vw, 1.6rem);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--sp-text);
    margin-bottom: 0.625rem;
}

/* Meta row */
.sp-meta {
    display: flex; align-items: center; flex-wrap: wrap;
    gap: 0.3rem 0.5rem;
    font-size: 0.65rem; font-weight: 600;
    color: var(--sp-muted);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--sp-border);
    margin-bottom: 0;
}
.sp-author-avatar {
    width: 18px; height: 18px;
    border-radius: 50%; overflow: hidden;
    border: 1px solid var(--sp-border); flex-shrink: 0;
}
.sp-author-avatar img { width: 100%; height: 100%; object-fit: cover; }
.sp-sep { opacity: 0.35; }
.sp-meta-cmt {
    display: inline-flex; align-items: center; gap: 0.25rem;
    color: var(--sp-muted); text-decoration: none;
    transition: color 0.15s;
}
.sp-meta-cmt:hover { color: var(--sp-accent); }
.sp-meta-cmt svg { width: 11px; height: 11px; }

/* Content */
.sp-content {
    padding: 0.875rem 1rem 1rem;
    font-size: 0.9rem;
    line-height: 1.72;
    color: var(--sp-text);
}
.sp-content > * + * { margin-top: 1em; }

.sp-content h1,
.sp-content h2,
.sp-content h3,
.sp-content h4,
.sp-content h5,
.sp-content h6 {
    font-weight: 800; line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--sp-text);
    margin-top: 1.6em; margin-bottom: 0.45em;
}
.sp-content h2 { font-size: 1.2rem; }
.sp-content h3 { font-size: 1.05rem; }
.sp-content h4 { font-size: 0.95rem; }

.sp-content p { margin-bottom: 0; }
.sp-content a { color: var(--sp-accent); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.sp-content a:hover { color: var(--sp-accent-dk); }

.sp-content ul, .sp-content ol {
    padding-left: 1.3em;
}
.sp-content li { margin-bottom: 0.3em; }

.sp-content blockquote {
    padding: 0.65rem 0.875rem;
    margin: 1.5em 0;
    border-left: 3px solid var(--sp-accent);
    background: var(--sp-code-bg);
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: var(--sp-muted);
    font-size: 0.925rem;
}

.sp-content pre {
    background: var(--sp-code-bg);
    border: 1px solid var(--sp-border);
    border-radius: 8px;
    padding: 0.875rem 1rem;
    overflow-x: auto;
    font-family: var(--sp-mono);
    font-size: 0.82rem;
    line-height: 1.6;
    margin: 1.5em 0;
}
.sp-content code {
    font-family: var(--sp-mono);
    font-size: 0.82em;
    background: var(--sp-code-bg);
    border: 1px solid var(--sp-border);
    border-radius: 4px;
    padding: 0.12em 0.38em;
    color: var(--sp-accent);
}
.sp-content pre code { background: none; border: none; padding: 0; color: var(--sp-text); font-size: inherit; }

.sp-content hr { border: none; border-top: 1px solid var(--sp-border); margin: 2em 0; }

.sp-content figure { margin: 1.5em 0; }
.sp-content figure img { border-radius: 8px; border: 1px solid var(--sp-border); }
.sp-content figcaption { margin-top: 0.4em; font-size: 0.75rem; text-align: center; color: var(--sp-light); }

.sp-content table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin: 1.5em 0; }
.sp-content th, .sp-content td { padding: 0.5rem 0.75rem; border: 1px solid var(--sp-border); text-align: left; }
.sp-content th { background: var(--sp-code-bg); font-weight: 700; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.07em; }

/* Tags */
.sp-tags {
    display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--sp-border);
}
.sp-tags-lbl {
    font-size: 0.6rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.12em;
    color: var(--sp-light); margin-right: 0.1rem;
}
.sp-tag {
    padding: 0.18rem 0.5rem;
    border: 1px solid var(--sp-border);
    border-radius: 999px;
    font-size: 0.6rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.07em;
    color: var(--sp-muted); text-decoration: none;
    transition: border-color 0.15s, color 0.15s;
}
.sp-tag:hover { border-color: var(--sp-accent); color: var(--sp-accent); }

/* Share */
.sp-share {
    display: flex; align-items: center; flex-wrap: wrap; gap: 0.4rem;
    padding: 0.625rem 1rem;
    border-top: 1px solid var(--sp-border);
    background: var(--sp-bg);
}
.sp-share-lbl {
    font-size: 0.6rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.12em;
    color: var(--sp-light); margin-right: 0.1rem;
}
.sp-share-btn {
    display: inline-flex; align-items: center; gap: 0.28rem;
    padding: 0.28rem 0.65rem;
    border-radius: 999px;
    font-size: 0.62rem; font-weight: 800;
    text-decoration: none;
    border: none; cursor: pointer;
    transition: opacity 0.15s, transform 0.12s;
    font-family: var(--sp-font);
}
.sp-share-btn:hover { opacity: 0.82; transform: translateY(-1px); }
.sp-share-btn svg { width: 11px; height: 11px; flex-shrink: 0; }
.sp-x    { background: #1d9bf0; color: #fff; }
.sp-tg   { background: #2aabee; color: #fff; }
.sp-copy { background: var(--sp-code-bg); color: var(--sp-muted); border: 1px solid var(--sp-border); }

/* Post nav */
.sp-postnav {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--sp-border);
}
.sp-postnav-item {
    display: flex; flex-direction: column; gap: 0.2rem;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--sp-border);
    border-radius: 8px; text-decoration: none;
    transition: border-color 0.15s, background 0.15s;
    background: var(--sp-bg);
}
.sp-postnav-item:hover { border-color: var(--sp-accent); background: var(--sp-card); }
.sp-pn-next { align-items: flex-end; text-align: right; }
.sp-pn-dir {
    font-size: 0.58rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.1em;
    color: var(--sp-light);
    display: flex; align-items: center; gap: 0.2rem;
}
.sp-pn-dir svg { width: 10px; height: 10px; flex-shrink: 0; }
.sp-pn-title {
    font-size: 0.72rem; font-weight: 700;
    color: var(--sp-text); line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ════════════════════════════════════════
   RIGHT: SIDEBAR — STICKY COMMENTS
════════════════════════════════════════ */
.sp-sidebar { position: relative; }

.sp-sidebar-sticky {
    position: sticky;
    top: calc(var(--sp-nav-h) + 0.75rem);
    max-height: calc(100vh - var(--sp-nav-h) - 1.5rem);
    display: flex; flex-direction: column;
    background: var(--sp-sidebar-bg);
    border: 1px solid var(--sp-border);
    border-radius: 12px;
    overflow: hidden;
}

.sp-sidebar-hd {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.625rem 0.875rem;
    font-size: 0.68rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.1em;
    color: var(--sp-text);
    border-bottom: 1px solid var(--sp-border);
    flex-shrink: 0;
    background: var(--sp-bg);
}
.sp-sidebar-hd svg { width: 13px; height: 13px; color: var(--sp-accent); flex-shrink: 0; }

.sp-sidebar-scroll {
    flex: 1; overflow-y: auto;
    padding: 0.625rem 0.875rem;
}
.sp-sidebar-scroll::-webkit-scrollbar { width: 3px; }
.sp-sidebar-scroll::-webkit-scrollbar-thumb { background: var(--sp-border); border-radius: 3px; }

/* Comments inside sidebar */
.sp-sidebar-scroll .comment-list { list-style: none; }
.sp-sidebar-scroll .comment {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--sp-border);
}
.sp-sidebar-scroll .comment:last-child { border-bottom: none; }
.sp-sidebar-scroll .comment-author {
    display: flex; align-items: center; gap: 0.4rem;
    margin-bottom: 0.3rem;
}
.sp-sidebar-scroll .comment-author img {
    width: 24px; height: 24px;
    border-radius: 50%;
    border: 1px solid var(--sp-border);
    flex-shrink: 0;
}
.sp-sidebar-scroll .comment-author .fn {
    font-weight: 700; font-size: 0.72rem; color: var(--sp-text);
}
.sp-sidebar-scroll .comment-author .says { display: none; }
.sp-sidebar-scroll .comment-meta {
    font-size: 0.58rem; color: var(--sp-light); margin-bottom: 0.3rem;
}
.sp-sidebar-scroll .comment-content p {
    font-size: 0.78rem; color: var(--sp-muted); line-height: 1.55;
}
.sp-sidebar-scroll .reply a {
    font-size: 0.58rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.07em;
    color: var(--sp-accent);
}

/* Comment form in sidebar */
.sp-sidebar-scroll .comment-respond { margin-top: 0.75rem; }
.sp-sidebar-scroll .comment-respond h3 {
    font-size: 0.72rem; font-weight: 800;
    margin-bottom: 0.625rem; color: var(--sp-text);
}
.sp-sidebar-scroll .comment-form label {
    display: block;
    font-size: 0.6rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.07em;
    color: var(--sp-muted); margin-bottom: 0.25rem;
}
.sp-sidebar-scroll .comment-form input[type="text"],
.sp-sidebar-scroll .comment-form input[type="email"],
.sp-sidebar-scroll .comment-form input[type="url"],
.sp-sidebar-scroll .comment-form textarea {
    width: 100%;
    background: var(--sp-bg);
    border: 1px solid var(--sp-border);
    border-radius: 6px;
    padding: 0.38rem 0.55rem;
    font-family: var(--sp-font);
    font-size: 0.78rem; color: var(--sp-text);
    outline: none; margin-bottom: 0.5rem;
    transition: border-color 0.15s;
}
.sp-sidebar-scroll .comment-form input:focus,
.sp-sidebar-scroll .comment-form textarea:focus { border-color: var(--sp-accent); }
.sp-sidebar-scroll .comment-form textarea { min-height: 80px; resize: vertical; }
.sp-sidebar-scroll .comment-form input[type="submit"] {
    display: inline-flex; align-items: center;
    padding: 0.38rem 1rem;
    border-radius: 999px;
    background: var(--sp-accent); color: #fff;
    border: none; font-family: var(--sp-font);
    font-size: 0.68rem; font-weight: 800;
    text-transform: uppercase; letter-spacing: 0.09em;
    cursor: pointer;
    transition: background 0.15s, transform 0.12s;
}
.sp-sidebar-scroll .comment-form input[type="submit"]:hover {
    background: var(--sp-accent-dk);
    transform: translateY(-1px);
}

/* No comments message */
.sp-sidebar-scroll p { font-size: 0.78rem; color: var(--sp-muted); }

/* ════════════════════════════════════════
   FOOTER
════════════════════════════════════════ */
.sp-footer {
    border-top: 1px solid var(--sp-border);
    font-size: 0.65rem; color: var(--sp-light);
    font-weight: 600; letter-spacing: 0.06em;
}
.sp-footer .sp-wrap {
    padding-top: 0.875rem; padding-bottom: 0.875rem;
    text-align: center;
}
.sp-footer a { color: var(--sp-light); }
.sp-footer a:hover { color: var(--sp-accent); }

/* ════════════════════════════════════════
   ANIMATIONS
════════════════════════════════════════ */
@keyframes rainbowShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.55; transform: scale(0.8); }
}

/* ════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════ */
@media (max-width: 900px) {
    :root { --sp-side-col: 280px; }
}
@media (max-width: 720px) {
    .sp-layout {
        grid-template-columns: 1fr;
    }
    .sp-sidebar {
        display: none; /* sidebar hidden on mobile — comments shown inline */
    }
    .sp-postnav { grid-template-columns: 1fr; }
    .sp-pn-next { align-items: flex-start; text-align: left; }
}