/* ── Skwiz Blog - Shared Styles ── */
/* Inherits design tokens and aesthetics from the landing page */

:root {
    --bg: #0c0c10;
    --bg-alt: #111116;
    --surface: #18181e;
    --surface-hover: #1f1f27;
    --border: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(255, 255, 255, 0.14);
    --text: #ededed;
    --text-sec: #999;
    --text-dim: #666;
    --accent: #667eea;
    --accent-dim: rgba(102, 126, 234, 0.12);
    --green: #2ecc71;
    --green-dim: rgba(46, 204, 113, 0.1);
    --mono: 'JetBrains Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 28px;
}

a {
    color: inherit;
}

/* ── Nav ── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    border-bottom: 1px solid var(--border);
    background: rgba(12, 12, 16, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-right a {
    font-size: 13px;
    color: var(--text-sec);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-right a:hover {
    color: var(--text);
}

.nav-btn {
    background: linear-gradient(135deg, #667eea, #764ba2) !important;
    color: #fff !important;
    padding: 7px 16px;
    border-radius: 8px;
    font-weight: 600 !important;
}

.nav-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

/* ── Footer ── */
footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
    text-align: center;
    color: var(--text-dim);
    font-size: 13px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 8px;
}

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 12px;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--text);
}

/* ── Reading Progress Bar ── */
.reading-progress {
    position: fixed;
    top: 56px;
    left: 0;
    width: 0%;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    z-index: 100;
    transition: width 0.1s linear;
}

/* ── Blog Index Page ── */
.blog-hero {
    padding: 120px 0 48px;
    text-align: center;
}

.blog-hero h1 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.blog-hero p {
    color: var(--text-sec);
    font-size: 16px;
    max-width: 500px;
    margin: 0 auto;
}

/* Tag Filters */
.tag-filters {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tag-filter {
    padding: 6px 16px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-sec);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.tag-filter:hover {
    border-color: var(--border-hover);
    color: var(--text);
}

.tag-filter.active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

/* Blog Grid */
.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 720px;
    margin: 0 auto;
    padding-bottom: 80px;
}

.blog-card {
    display: flex;
    flex-direction: column;
    padding: 28px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface);
    transition: border-color 0.25s, transform 0.2s ease, box-shadow 0.25s;
    text-decoration: none;
    cursor: pointer;
}

.blog-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.blog-tag {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
}

.blog-tag[data-tag="Guide"] {
    color: #10b981;
}

.blog-tag[data-tag="Deep Dive"] {
    color: #667eea;
}

.blog-tag[data-tag="Case Study"] {
    color: #f59e0b;
}

.blog-tag[data-tag="SEO"] {
    color: #14b8a6;
}

.blog-read-time {
    font-size: 11px;
    color: var(--text-dim);
    font-family: var(--mono);
}

.blog-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
    line-height: 1.4;
}

.blog-card p {
    font-size: 14px;
    color: var(--text-sec);
    line-height: 1.6;
    margin-bottom: 12px;
}

.blog-date {
    font-size: 11px;
    color: var(--text-dim);
    font-family: var(--mono);
}

.blog-empty {
    text-align: center;
    color: var(--text-dim);
    padding: 60px 0;
    font-size: 15px;
}

/* ── Single Post Page ── */
.post-header {
    padding: 120px 0 40px;
    max-width: 720px;
    margin: 0 auto;
}

.post-back {
    display: flex;
    width: fit-content;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-dim);
    text-decoration: none;
    margin-bottom: 24px;
    transition: color 0.2s;
}

.post-back:hover {
    color: var(--accent);
}

.post-header .blog-tag {
    margin-bottom: 16px;
    display: inline-block;
}

.post-header h1 {
    font-size: clamp(26px, 4vw, 36px);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.25;
    margin-bottom: 16px;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-dim);
    font-size: 13px;
}

.post-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.post-divider {
    height: 1px;
    background: var(--border);
    max-width: 720px;
    margin: 0 auto;
}

/* Article Content */
.post-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 0 80px;
}

.post-content h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 40px 0 16px;
    letter-spacing: -0.3px;
    color: var(--text);
}

.post-content h2:first-child {
    margin-top: 0;
}

.post-content h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 28px 0 12px;
    color: var(--text);
}

.post-content p {
    font-size: 15px;
    color: var(--text-sec);
    line-height: 1.8;
    margin-bottom: 20px;
}

.post-content strong {
    color: var(--text);
    font-weight: 600;
}

.post-content ul,
.post-content ol {
    margin: 0 0 20px 20px;
    color: var(--text-sec);
    font-size: 15px;
    line-height: 1.8;
}

.post-content li {
    margin-bottom: 6px;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
}

.post-content thead th {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 2px solid var(--border-hover);
    color: var(--text);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-content tbody td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-sec);
}

.post-content tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.post-content code {
    font-family: var(--mono);
    font-size: 13px;
    background: rgba(102, 126, 234, 0.08);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 4px;
}

.post-content blockquote {
    border-left: 3px solid var(--accent);
    padding: 12px 20px;
    margin: 24px 0;
    background: var(--accent-dim);
    border-radius: 0 8px 8px 0;
}

.post-content blockquote p {
    margin-bottom: 0;
    color: var(--text);
    font-style: italic;
}

/* Article Hero Banner */
/* Callout boxes */
.callout {
    padding: 16px 20px;
    border-radius: 10px;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.7;
}

.callout-tip {
    background: rgba(46, 204, 113, 0.08);
    border: 1px solid rgba(46, 204, 113, 0.2);
    color: #2ecc71;
}

.callout-info {
    background: rgba(102, 126, 234, 0.08);
    border: 1px solid rgba(102, 126, 234, 0.2);
    color: #8b9cf7;
}

.callout-warning {
    background: rgba(241, 196, 15, 0.08);
    border: 1px solid rgba(241, 196, 15, 0.2);
    color: #f1c40f;
}

.callout strong {
    color: inherit;
}

/* Table of Contents */
.toc {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    margin: 0 0 32px;
    background: var(--surface);
}

.toc h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.toc ol {
    margin: 0 0 0 16px;
    font-size: 14px;
    color: var(--accent);
}

.toc li {
    margin-bottom: 4px;
}

/* Key Metric Cards */
.metric-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin: 24px 0;
}

.metric-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    text-align: center;
}

.metric-card .metric-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
    display: block;
}

.metric-card .metric-label {
    font-size: 11px;
    color: var(--text-dim);
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
    display: block;
}

/* Related Posts */
.related-posts {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 0 80px;
    border-top: 1px solid var(--border);
    padding-top: 40px;
}

.related-posts h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.related-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.related-card {
    display: flex;
    flex-direction: column;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    text-decoration: none;
    transition: border-color 0.25s, transform 0.2s;
}

.related-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.related-card .blog-tag {
    margin-bottom: 8px;
    font-size: 9px;
}

.related-card h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
}

/* CTA Banner */
.post-cta {
    max-width: 720px;
    margin: 0 auto 80px;
    padding: 32px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 14px;
    text-align: center;
}

.post-cta h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.post-cta p {
    font-size: 14px;
    color: var(--text-sec);
    margin-bottom: 16px;
}

.post-cta .btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: filter 0.2s, transform 0.2s;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    box-shadow: 0 2px 12px rgba(102, 126, 234, 0.3);
}

.post-cta .btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

/* Loading / Error States */
.blog-loading {
    text-align: center;
    padding: 120px 0;
    color: var(--text-dim);
    font-size: 15px;
}

.blog-loading .spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.blog-error {
    text-align: center;
    padding: 120px 0;
    color: var(--text-dim);
}

/* Scroll reveal */
.enter {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.enter.in {
    opacity: 1;
    transform: none;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .container {
        padding: 0 20px;
    }

    .nav-right {
        gap: 14px;
    }

    .nav-right a {
        font-size: 12px;
    }

    .blog-grid {
        gap: 12px;
    }

    .blog-card {
        padding: 20px;
    }

    .blog-card h3 {
        font-size: 16px;
    }

    .post-header h1 {
        font-size: 24px;
    }

    .post-content h2 {
        font-size: 19px;
    }

    .post-content p,
    .post-content ul,
    .post-content ol {
        font-size: 14px;
    }

    .related-grid {
        grid-template-columns: 1fr;
    }

    .post-cta {
        padding: 24px;
    }
}