/* ═══════════════════════════════════════════════════════════
   THEME COMPARTIDO — usado por index.php, post.php y admin/
   dentro de /publicaciones. Extraído del mismo sistema visual
   del index.php principal para que todo el sitio se vea igual.
   ═══════════════════════════════════════════════════════════ */

:root {
    --bg-primary:  #070710;
    --bg-secondary: #0d0d1a;
    --bg-card:     rgba(255,255,255,0.04);
    --border:      rgba(255,255,255,0.08);
    --accent-1:    #6366f1;
    --accent-2:    #8b5cf6;
    --accent-3:    #06b6d4;
    --text-primary:   #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted:     #64748b;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body::before {
    content: '';
    position: fixed;
    top: -40%;
    left: -15%;
    width: 55%;
    height: 80%;
    background: radial-gradient(ellipse, rgba(99,102,241,.15) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}
body::after {
    content: '';
    position: fixed;
    bottom: -30%;
    right: -15%;
    width: 55%;
    height: 80%;
    background: radial-gradient(ellipse, rgba(6,182,212,.1) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}

main { flex: 1; }

/* ─── NAVBAR ─── */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(7,7,16,.85);
    border-bottom: 1px solid var(--border);
}
.nav-logo {
    font-size: 1.4rem;
    font-weight: 800;
    text-decoration: none;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: .9rem;
    font-weight: 500;
    transition: color .3s;
}
.nav-links a:hover, .nav-links a.is-active { color: var(--text-primary); }
.nav-cta {
    padding: .5rem 1.2rem;
    background: var(--gradient) !important;
    color: white !important;
    border-radius: 6px;
    font-weight: 600 !important;
}
@media (max-width: 768px) { .nav-links { display: none; } }

/* ─── SECTION BASE ─── */
.section { position: relative; z-index: 1; padding: 9rem 5% 6rem; max-width: 1200px; margin: 0 auto; }
.section-tag {
    display: inline-block;
    font-size: .75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: #818cf8;
    margin-bottom: .6rem;
}
.section-title {
    font-size: clamp(1.75rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -.025em;
    line-height: 1.15;
    margin-bottom: 1rem;
}
.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 620px;
    line-height: 1.75;
    margin-bottom: 3.5rem;
}

/* ─── BUTTONS ─── */
.btn-primary {
    padding: .875rem 2rem;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    transition: opacity .3s, transform .3s;
}
.btn-primary:hover { opacity: .88; transform: translateY(-2px); }
.btn-secondary {
    padding: .875rem 2rem;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    transition: border-color .3s, background .3s;
}
.btn-secondary:hover { border-color: rgba(99,102,241,.5); background: rgba(99,102,241,.06); }
.btn-danger { color: #fca5a5; border-color: rgba(239,68,68,.35); }
.btn-danger:hover { border-color: rgba(239,68,68,.6); background: rgba(239,68,68,.08); }
.btn-sm { padding: .5rem 1rem; font-size: .8rem; }

/* ─── BLOG GRID / CARDS ─── */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color .3s, transform .3s, background .3s;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}
.post-card:hover { border-color: rgba(99,102,241,.4); transform: translateY(-4px); background: rgba(99,102,241,.05); }
.post-card-cover { width: 100%; height: 170px; object-fit: cover; background: rgba(255,255,255,.03); }
.post-card-body { padding: 1.5rem; display: flex; flex-direction: column; gap: .6rem; flex: 1; }
.post-card-date { font-size: .75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .08em; }
.post-card h3 { font-size: 1.15rem; font-weight: 700; line-height: 1.35; }
.post-card p { font-size: .88rem; color: var(--text-secondary); line-height: 1.6; }
.post-card-more { font-size: .85rem; font-weight: 600; color: #a5b4fc; margin-top: auto; }

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    border: 1px dashed var(--border);
    border-radius: 16px;
    color: var(--text-secondary);
}

/* ─── SINGLE POST ─── */
.post-header { max-width: 760px; margin: 0 auto 3rem; text-align: center; }
.post-header .section-tag { display: block; }
.post-header h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 900; line-height: 1.15; margin: .75rem 0 1rem; }
.post-meta { font-size: .85rem; color: var(--text-muted); }
.post-cover { width: 100%; max-height: 420px; object-fit: cover; border-radius: 16px; margin-bottom: 2.5rem; border: 1px solid var(--border); }
.post-content { max-width: 760px; margin: 0 auto; font-size: 1.05rem; line-height: 1.85; color: var(--text-secondary); }
.post-content h2 { color: var(--text-primary); font-size: 1.5rem; margin: 2rem 0 1rem; font-weight: 700; }
.post-content h3 { color: var(--text-primary); font-size: 1.2rem; margin: 1.75rem 0 .75rem; font-weight: 700; }
.post-content p { margin-bottom: 1.25rem; }
.post-content a { color: #a5b4fc; }
.post-content img { max-width: 100%; border-radius: 12px; margin: 1.5rem 0; }
.post-content ul, .post-content ol { margin: 0 0 1.25rem 1.5rem; }
.post-content code { background: rgba(255,255,255,.08); padding: .15rem .4rem; border-radius: 4px; font-size: .9em; }
.post-content pre { background: rgba(0,0,0,.35); border: 1px solid var(--border); border-radius: 10px; padding: 1rem; overflow-x: auto; margin-bottom: 1.25rem; }
.post-content blockquote { border-left: 3px solid var(--accent-1); padding-left: 1rem; color: var(--text-muted); margin-bottom: 1.25rem; }
.post-back { display: inline-flex; align-items: center; gap: .5rem; margin-bottom: 2.5rem; color: var(--text-secondary); text-decoration: none; font-size: .9rem; }
.post-back:hover { color: var(--text-primary); }

/* ─── FORMS (admin) ─── */
.form-group { display: flex; flex-direction: column; gap: .35rem; margin-bottom: 1.25rem; }
.form-group label { font-size: .75rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: .07em; }
.form-group input,
.form-group textarea,
.form-group select {
    padding: .8rem 1rem;
    background: rgba(0,0,0,.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: .9rem;
    outline: none;
    transition: border-color .3s;
    width: 100%;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: rgba(99,102,241,.55); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }
.form-group select option { background: #0d0d1a; }
.form-group textarea { resize: vertical; min-height: 120px; font-family: 'Courier New', monospace; }
.form-group small { color: var(--text-muted); font-size: .78rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    max-width: 720px;
    margin: 0 auto;
}

.form-alert {
    display: flex;
    align-items: flex-start;
    gap: .75rem;
    padding: .9rem 1rem;
    border-radius: 10px;
    font-size: .875rem;
    line-height: 1.55;
    margin-bottom: 1.5rem;
}
.form-alert.is-ok { background: rgba(34,197,94,.1); border: 1px solid rgba(34,197,94,.35); color: #86efac; }
.form-alert.is-error { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.35); color: #fca5a5; }

/* ─── ADMIN TABLE ─── */
.admin-bar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2rem; flex-wrap: wrap; gap: 1rem; }
.admin-table-wrap { overflow-x: auto; border-radius: 16px; border: 1px solid var(--border); }
.admin-table { width: 100%; border-collapse: collapse; background: var(--bg-card); }
.admin-table th, .admin-table td { padding: .9rem 1.2rem; text-align: left; font-size: .88rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
.admin-table th { color: var(--text-secondary); text-transform: uppercase; font-size: .72rem; letter-spacing: .08em; }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table td.actions { display: flex; gap: .6rem; }
.status-badge { display: inline-block; padding: .2rem .65rem; border-radius: 50px; font-size: .72rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; }
.status-badge.published { background: rgba(34,197,94,.12); color: #86efac; border: 1px solid rgba(34,197,94,.3); }
.status-badge.draft { background: rgba(148,163,184,.12); color: var(--text-secondary); border: 1px solid var(--border); }
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 2rem; position: relative; z-index: 1; }

/* ─── FOOTER ─── */
footer { position: relative; z-index: 1; border-top: 1px solid var(--border); padding: 3.5rem 5% 2rem; }
.footer-bottom { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; font-size: .8rem; color: var(--text-muted); flex-wrap: wrap; gap: 1rem; }

@media (max-width: 768px) {
    .footer-bottom { flex-direction: column; text-align: center; }
    .form-row { grid-template-columns: 1fr; }
    .admin-bar { flex-direction: column; align-items: flex-start; }
}