/* ==============================
   MODELFINDER — Shared Blog CSS
   ============================== */

:root {
    --bg-color: #fcfcfc;
    --text-main: #111111;
    --text-muted: #666666;
    --accent: #4338ca;
    --accent-hover: #3730a3;
    --card-bg: #ffffff;
    --border-color: #eaeaea;
    --nav-bg: rgba(252, 252, 252, 0.95);
    --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 20px 35px rgba(67, 56, 202, 0.08);
    --tag-free-bg: #e0f2fe;
    --tag-free-text: #0369a1;
    --tag-paid-bg: #fef3c7;
    --tag-paid-text: #b45309;
}

body.dark-mode {
    --bg-color: #0d1117;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --card-bg: #1e293b;
    --border-color: #334155;
    --nav-bg: rgba(13, 17, 23, 0.95);
    --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 20px 35px rgba(0, 0, 0, 0.5);
    --tag-free-bg: #064e3b;
    --tag-free-text: #34d399;
    --tag-paid-bg: #78350f;
    --tag-paid-text: #fbbf24;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ── Navigation ── */
nav {
    padding: 1.25rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-main);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
}

.nav-cta {
    background-color: var(--accent);
    color: white !important;
    padding: 0.45rem 1.1rem;
    border-radius: 20px;
    font-weight: 600 !important;
    font-size: 0.85rem !important;
    transition: background-color 0.2s ease !important;
}

.nav-cta:hover {
    background-color: var(--accent-hover) !important;
    color: white !important;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.dark-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.2s ease;
}

.dark-toggle:hover { background: var(--border-color); }

/* ── Page Hero ── */
.page-hero {
    padding: 4rem 5% 3rem;
    max-width: 860px;
    margin: 0 auto;
    width: 100%;
}

.page-hero .breadcrumb {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.page-hero .breadcrumb a {
    color: var(--accent);
    text-decoration: none;
}

.page-hero .article-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    background: rgba(67, 56, 202, 0.08);
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    margin-bottom: 1rem;
}

.page-hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.page-hero .article-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.page-hero .article-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* ── Article Body ── */
.article-body {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 5% 5rem;
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.article-body h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 2.5rem 0 1rem;
    letter-spacing: -0.02em;
}

.article-body h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 2rem 0 0.75rem;
}

.article-body p {
    margin-bottom: 1.25rem;
}

.article-body ul,
.article-body ol {
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body strong {
    color: var(--text-main);
    font-weight: 600;
}

.article-body a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-body a:hover {
    color: var(--accent-hover);
}

.article-body blockquote {
    border-left: 3px solid var(--accent);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    background: rgba(67, 56, 202, 0.04);
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: var(--text-main);
}

/* ── Comparison Table inside articles ── */
.article-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    margin: 1.5rem 0 2rem;
    color: var(--text-main);
}

.article-body th,
.article-body td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.article-body th {
    font-weight: 600;
    background: var(--bg-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.article-body tr:hover td {
    background: rgba(67, 56, 202, 0.03);
}

/* ── Callout Box ── */
.callout {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent);
    border-radius: 0 12px 12px 0;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    font-size: 0.95rem;
}

.callout strong {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--accent);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* ── CTA Box ── */
.cta-box {
    background: linear-gradient(135deg, rgba(67, 56, 202, 0.08) 0%, rgba(99, 102, 241, 0.05) 100%);
    border: 1px solid rgba(67, 56, 202, 0.2);
    border-radius: 16px;
    padding: 2rem;
    margin: 3rem 0;
    text-align: center;
}

.cta-box h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.cta-box p {
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}

.cta-box a {
    display: inline-block;
    background: var(--accent);
    color: white !important;
    text-decoration: none !important;
    padding: 0.75rem 2rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: background 0.2s ease;
}

.cta-box a:hover {
    background: var(--accent-hover) !important;
}

/* ── Related Articles Grid ── */
.related-section {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 5% 5rem;
}

.related-section h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.related-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.25rem;
    text-decoration: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    display: block;
}

.related-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-hover);
}

.related-card .rc-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 0.5rem;
    display: block;
}

.related-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.4;
}

/* ── Blog Index Page ── */
.blog-index-hero {
    padding: 4rem 5% 2rem;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
    text-align: center;
}

.blog-index-hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.blog-index-hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto;
}

.blog-grid-container {
    max-width: 1100px;
    margin: 3rem auto;
    padding: 0 5% 5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.blog-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    padding: 2rem;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: transform 0.3s cubic-bezier(0.16,1,0.3,1), box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: var(--shadow-subtle);
}

.blog-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: var(--shadow-hover);
}

.blog-card .bc-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
}

.blog-card h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.4;
}

.blog-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
    flex: 1;
}

.blog-card .bc-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
    margin-top: auto;
}

/* ── Contact Page ── */
.contact-container {
    max-width: 680px;
    margin: 4rem auto;
    padding: 0 5% 5rem;
}

.contact-container h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 0.75rem;
}

.contact-container .contact-sub {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-size: 1.05rem;
}

.contact-form {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow-subtle);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.85rem 1rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(67, 56, 202, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.6;
}

.submit-btn {
    width: 100%;
    background: var(--accent);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.1s ease;
    letter-spacing: 0.02em;
}

.submit-btn:hover { background: var(--accent-hover); }
.submit-btn:active { transform: scale(0.99); }

.success-msg {
    display: none;
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
    border-radius: 10px;
    padding: 1rem 1.25rem;
    margin-top: 1rem;
    font-weight: 600;
    font-size: 0.9rem;
}

body.dark-mode .success-msg {
    background: #064e3b;
    color: #34d399;
    border-color: #34d399;
}

/* ── Footer ── */
footer {
    text-align: center;
    padding: 2rem 5%;
    color: var(--text-muted);
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer-main {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.footer-links {
    margin-top: 0.75rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.footer-disclaimer {
    font-size: 0.75rem;
    color: #999;
    max-width: 600px;
    margin: 0.75rem auto 0;
    line-height: 1.5;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .nav-links .hide-mobile { display: none; }
    .blog-grid-container { grid-template-columns: 1fr; }
    .contact-form { padding: 1.5rem; }
    .page-hero { padding: 2.5rem 5% 2rem; }
}