/* ============================================================
   BacaSoftware — Design System v2 (Modern)
   ============================================================ */

/* --- Variables --- */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #60a5fa;
    --color-accent: #06b6d4;
    --color-accent-dark: #0891b2;
    --color-purple: #7c3aed;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-gray: #f8fafc;
    --color-bg-dark: #040d1a;
    --color-border: #e2e8f0;
    --color-border-dark: #cbd5e1;
    --color-success: #059669;
    --color-error: #dc2626;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', Consolas, monospace;

    --radius: 10px;
    --radius-sm: 6px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow: 0 4px 20px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.05);
    --shadow-lg: 0 12px 40px rgba(0,0,0,.12), 0 4px 12px rgba(0,0,0,.06);
    --shadow-glow: 0 0 0 3px rgba(37,99,235,.18);

    --max-width: 1200px;
    --max-width-narrow: 760px;

    --header-height: 68px;

    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --gradient-hero: linear-gradient(135deg, #040d1a 0%, #0f172a 40%, #1e1b4b 80%, #0c1445 100%);
    --gradient-card: linear-gradient(135deg, rgba(37,99,235,.05) 0%, rgba(6,182,212,.05) 100%);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; font-feature-settings: 'kern', 'liga', 'calt'; }

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { list-style: none; }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 750;
    color: var(--color-text);
    letter-spacing: -.02em;
    margin-bottom: .5em;
}
h1 { font-size: clamp(1.85rem, 4.5vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.45rem); }
h4 { font-size: 1.1rem; letter-spacing: -.01em; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.container--narrow {
    max-width: var(--max-width-narrow);
}

.section {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

.section--gray {
    background: var(--color-bg-gray);
}

/* --- Grid --- */
.grid {
    display: grid;
    gap: 1.75rem;
}

.grid--3 {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .45rem;
    padding: .7rem 1.5rem;
    border-radius: var(--radius);
    font-size: .9rem;
    font-weight: 650;
    font-family: var(--font-sans);
    cursor: pointer;
    border: 2px solid transparent;
    text-decoration: none;
    transition: all .2s cubic-bezier(.4,0,.2,1);
    white-space: nowrap;
    letter-spacing: -.01em;
}

.btn--primary {
    background: var(--gradient-primary);
    background-size: 150% 150%;
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,99,235,.35);
}
.btn--primary:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #0891b2 100%);
    box-shadow: 0 6px 20px rgba(37,99,235,.45);
    transform: translateY(-1px);
    text-decoration: none;
    color: #fff;
}

.btn--secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn--secondary:hover {
    background: var(--color-primary);
    color: #fff;
    text-decoration: none;
    transform: translateY(-1px);
}

/* btn--secondary on dark backgrounds (hero) */
.hero .btn--secondary {
    background: rgba(255,255,255,.08);
    color: #fff;
    border-color: rgba(255,255,255,.3);
    backdrop-filter: blur(8px);
}
.hero .btn--secondary:hover {
    background: rgba(255,255,255,.18);
    border-color: rgba(255,255,255,.6);
    color: #fff;
}

.btn--small {
    padding: .4rem 1rem;
    font-size: .82rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    padding: .6rem 1.3rem;
    border-radius: var(--radius);
    font-weight: 650;
    border: none;
    cursor: pointer;
    font-size: .9rem;
    transition: all .2s;
    box-shadow: 0 3px 10px rgba(37,99,235,.3);
}
.btn-primary:hover {
    box-shadow: 0 5px 16px rgba(37,99,235,.45);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-muted);
    padding: .6rem 1.3rem;
    border-radius: var(--radius);
    font-weight: 600;
    border: 1.5px solid var(--color-border-dark);
    cursor: pointer;
    font-size: .9rem;
    transition: all .2s;
}
.btn-secondary:hover {
    background: var(--color-bg-gray);
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

.btn-link {
    color: var(--color-primary-light);
    font-size: .85rem;
    text-decoration: underline;
    padding: .55rem .5rem;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid rgba(226,232,240,.7);
    box-shadow: 0 1px 20px rgba(0,0,0,.06);
}

.site-header .container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-logo {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: .5rem;
    flex-shrink: 0;
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -.03em;
}

#main-nav ul {
    display: flex;
    align-items: center;
    gap: .15rem;
}

#main-nav a {
    display: block;
    padding: .45rem .85rem;
    border-radius: var(--radius-sm);
    font-weight: 550;
    font-size: .9rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: all .18s;
    position: relative;
}

#main-nav a:hover {
    color: var(--color-text);
    background: rgba(37,99,235,.06);
    text-decoration: none;
}

#main-nav a[aria-current="page"] {
    color: var(--color-primary);
    background: rgba(37,99,235,.08);
    font-weight: 650;
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 38px;
    height: 38px;
    padding: 7px;
    background: none;
    border: 1.5px solid var(--color-border);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: border-color .2s;
}
.nav-toggle:hover { border-color: var(--color-border-dark); }
.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform .3s cubic-bezier(.4,0,.2,1), opacity .3s;
}
.nav-toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    background: var(--color-bg-dark);
    color: #94a3b8;
    margin-top: 6rem;
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(37,99,235,.5), rgba(6,182,212,.4), transparent);
}

.site-footer .container {
    padding-top: 3.5rem;
    padding-bottom: 2rem;
    position: relative;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1fr;
    gap: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid rgba(255,255,255,.07);
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: inline-block;
    margin-bottom: .85rem;
    letter-spacing: -.03em;
}

.footer-brand p {
    font-size: .875rem;
    line-height: 1.7;
    color: #64748b;
    margin: 0;
    max-width: 300px;
}

.site-footer nav h3 {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: #475569;
    font-weight: 700;
    margin-bottom: 1rem;
}

.site-footer nav ul {
    display: flex;
    flex-direction: column;
    gap: .5rem;
}

.site-footer nav a {
    color: #64748b;
    font-size: .875rem;
    text-decoration: none;
    transition: color .15s;
    display: inline-flex;
    align-items: center;
}
.site-footer nav a:hover { color: #e2e8f0; }

.footer-bottom {
    padding-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-bottom p {
    font-size: .8rem;
    color: #334155;
    margin: 0;
}

.footer-bottom p:last-child {
    color: #1e293b;
    font-variant-numeric: tabular-nums;
    letter-spacing: .02em;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    background: var(--gradient-hero);
    color: #fff;
    padding: 6rem 0 5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 100%;
    background: radial-gradient(ellipse at center top, rgba(37,99,235,.25) 0%, transparent 65%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(6,182,212,.4), transparent);
}

.hero .container { position: relative; z-index: 1; }

.hero h1 {
    color: #fff;
    font-size: clamp(2rem, 5.5vw, 3.5rem);
    margin-bottom: 1.25rem;
    letter-spacing: -.03em;
    line-height: 1.1;
}

.hero h1 em {
    font-style: normal;
    background: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: #94a3b8;
    max-width: 580px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================================
   PAGE HEADER (blog index, courses, category)
   ============================================================ */
.page-header {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 60%, #1e3a8a 100%);
    color: #fff;
    padding: 3.5rem 0;
    margin-bottom: 0;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 70% 50%, rgba(37,99,235,.2) 0%, transparent 60%);
}

.page-header .container { position: relative; }

.page-header h1 {
    color: #fff;
    margin-bottom: .5rem;
}

.page-header p {
    color: #94a3b8;
    font-size: 1rem;
    margin: 0;
}

/* ============================================================
   CARDS (home featured section, courses index, category)
   ============================================================ */
.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: box-shadow .25s, transform .25s;
    position: relative;
}
.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: rgba(37,99,235,.15);
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: var(--gradient-card);
    opacity: 0;
    transition: opacity .25s;
    pointer-events: none;
}
.card:hover::before { opacity: 1; }

.card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform .35s;
}
.card:hover .card__image { transform: scale(1.03); }

.card__body {
    padding: 1.4rem;
    display: flex;
    flex-direction: column;
    gap: .6rem;
    flex: 1;
}

.card__category {
    font-size: .7rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-primary);
}

.card__title {
    font-size: 1.05rem;
    margin: 0;
    line-height: 1.3;
    letter-spacing: -.015em;
}
.card__title a { color: var(--color-text); text-decoration: none; }
.card__title a:hover { color: var(--color-primary); }

.card__excerpt {
    font-size: .875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
    flex: 1;
}

.card__date {
    font-size: .78rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.section__more {
    text-align: center;
    margin-top: 3rem;
}

/* ============================================================
   BLOG INDEX — post-card list view
   ============================================================ */
.blog-layout { max-width: 100%; }

.blog-main {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.post-card {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow .25s, transform .25s, border-color .25s;
    position: relative;
}
.post-card::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity .25s;
    border-radius: 0;
}
.post-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: rgba(37,99,235,.18);
}
.post-card:hover::after { opacity: 1; }

.post-card__image {
    width: 100%;
    height: 100%;
    min-height: 190px;
    object-fit: cover;
    display: block;
    transition: transform .35s;
}
.post-card:hover .post-card__image { transform: scale(1.04); }

.post-card__body {
    padding: 1.5rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: .55rem;
}

.post-card__category {
    font-size: .7rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-primary);
    text-decoration: none;
}
.post-card__category:hover { text-decoration: underline; }

.post-card__title {
    font-size: 1.2rem;
    margin: 0;
    line-height: 1.25;
    letter-spacing: -.02em;
}
.post-card__title a { color: var(--color-text); text-decoration: none; }
.post-card__title a:hover { color: var(--color-primary); }

.post-card__excerpt {
    font-size: .875rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    flex: 1;
    margin: 0;
}

.post-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: .8rem;
    color: var(--color-text-light);
    margin-top: .15rem;
}
.post-card__link {
    font-weight: 650;
    font-size: .82rem;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: .3rem;
}
.post-card__link::after { content: '→'; transition: transform .2s; }
.post-card__link:hover { text-decoration: none; color: var(--color-primary-dark); }
.post-card__link:hover::after { transform: translateX(3px); }

/* KnpPaginator — div.pagination > span.{current|page|first|previous|next|last} */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: .35rem;
    margin-top: 3.5rem;
    flex-wrap: wrap;
}

.pagination span {
    display: inline-flex;
}

.pagination span a,
.pagination span.current {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.4rem;
    height: 2.4rem;
    padding: 0 .7rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
    font-size: .875rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: all .18s;
    font-weight: 550;
    background: var(--color-bg);
}

.pagination span a:hover {
    background: rgba(37,99,235,.06);
    border-color: rgba(37,99,235,.3);
    color: var(--color-primary);
}

.pagination span.current {
    background: var(--gradient-primary);
    border-color: transparent;
    color: #fff;
    font-weight: 700;
    box-shadow: 0 3px 10px rgba(37,99,235,.35);
}

.pagination span.first a,
.pagination span.last a,
.pagination span.previous a,
.pagination span.next a {
    font-size: .8rem;
    letter-spacing: 0;
}

.pagination span.first a:hover,
.pagination span.last a:hover,
.pagination span.previous a:hover,
.pagination span.next a:hover {
    color: var(--color-primary);
    background: rgba(37,99,235,.06);
    border-color: rgba(37,99,235,.3);
}

/* ============================================================
   BLOG POST SINGLE
   ============================================================ */
.post-single {
    padding: 3.5rem 0 6rem;
}

.post-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

.post-category {
    display: inline-flex;
    align-items: center;
    font-size: .7rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-primary);
    margin-bottom: 1rem;
    text-decoration: none;
    background: rgba(37,99,235,.08);
    padding: .3rem .8rem;
    border-radius: 100px;
    transition: background .18s;
}
.post-category:hover {
    background: rgba(37,99,235,.14);
    text-decoration: none;
}

.post-header h1 {
    text-align: center;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.15;
}

.post-meta {
    margin-top: 1rem;
    font-size: .82rem;
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
}
.post-meta::before { content: '·'; display: none; }

.post-featured-image {
    margin: 0 0 2.5rem;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.post-featured-image img {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: cover;
}

/* Post body typography */
.post-content {
    font-size: 1.07rem;
    line-height: 1.85;
    color: #1e293b;
}
.post-content > * + * { margin-top: 1.5em; }
.post-content h2 {
    font-size: 1.65rem;
    margin-top: 3rem;
    margin-bottom: .85rem;
    padding-bottom: .5rem;
    border-bottom: 2px solid var(--color-border);
    letter-spacing: -.025em;
}
.post-content h3 {
    font-size: 1.25rem;
    margin-top: 2.25rem;
    margin-bottom: .6rem;
    letter-spacing: -.02em;
}
.post-content h4 {
    font-size: 1.08rem;
    margin-top: 1.75rem;
    margin-bottom: .4rem;
}
.post-content p { margin-bottom: 0; }
.post-content ul, .post-content ol {
    margin: 0 0 0 1.5rem;
    padding: 0;
}
.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }
.post-content li { margin-bottom: .45rem; }
.post-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: rgba(37,99,235,.35);
    text-underline-offset: 3px;
    transition: text-decoration-color .18s;
}
.post-content a:hover {
    color: var(--color-primary-dark);
    text-decoration-color: var(--color-primary-dark);
}
.post-content blockquote {
    border-left: 3px solid var(--color-accent);
    margin: 0;
    padding: 1.25rem 1.75rem;
    background: linear-gradient(135deg, rgba(6,182,212,.05) 0%, rgba(37,99,235,.04) 100%);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    color: #334155;
    font-style: italic;
    font-size: 1.05rem;
}
.post-content blockquote p { margin: 0; }
.post-content code {
    font-family: var(--font-mono);
    font-size: .85em;
    background: #f1f5f9;
    padding: .18em .5em;
    border-radius: var(--radius-sm);
    color: #c026d3;
    border: 1px solid #e2e8f0;
}
.post-content pre {
    background: #0d1117;
    color: #e2e8f0;
    padding: 1.5rem 1.75rem;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: 0;
    font-size: .875rem;
    line-height: 1.7;
    border: 1px solid rgba(255,255,255,.06);
    box-shadow: var(--shadow-lg);
}
.post-content pre code {
    background: none;
    color: inherit;
    padding: 0;
    border-radius: 0;
    border: none;
    font-size: inherit;
}
.post-content img {
    border-radius: var(--radius-lg);
    margin: 0 auto;
    max-width: 100%;
    box-shadow: var(--shadow);
}
.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
    font-size: .9rem;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.post-content th, .post-content td {
    padding: .7rem 1.1rem;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
}
.post-content th {
    background: var(--color-bg-gray);
    font-weight: 700;
    font-size: .82rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--color-text-muted);
}
.post-content tr:last-child td { border-bottom: none; }
.post-content tr:hover td { background: #f8fafc; }

/* Post tags */
.post-tags {
    margin-top: 3.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: .5rem;
    font-size: .875rem;
    color: var(--color-text-muted);
}

.tag {
    display: inline-flex;
    align-items: center;
    background: rgba(37,99,235,.07);
    color: var(--color-primary);
    border: 1px solid rgba(37,99,235,.15);
    padding: .25rem .75rem;
    border-radius: 100px;
    font-size: .78rem;
    font-weight: 600;
    transition: background .15s, border-color .15s;
}
.tag:hover {
    background: rgba(37,99,235,.12);
    border-color: rgba(37,99,235,.25);
}

/* ============================================================
   COURSE SINGLE
   ============================================================ */
.course-single {
    padding: 3.5rem 0 6rem;
}

.course-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

.course-header h1 {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.15;
}

.course-header__description {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 580px;
    margin: 1rem auto 0;
    line-height: 1.7;
}

.course-featured-image {
    margin: 0 0 2.5rem;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.course-featured-image img {
    width: 100%;
    height: auto;
    max-height: 450px;
    object-fit: cover;
}

.course-content {
    font-size: 1.07rem;
    line-height: 1.85;
    color: #1e293b;
}
.course-content > * + * { margin-top: 1.5em; }
.course-content h2 { font-size: 1.65rem; margin-top: 3rem; margin-bottom: .85rem; padding-bottom: .5rem; border-bottom: 2px solid var(--color-border); letter-spacing: -.025em; }
.course-content h3 { font-size: 1.25rem; margin-top: 2.25rem; margin-bottom: .6rem; letter-spacing: -.02em; }
.course-content p { margin-bottom: 0; }
.course-content ul, .course-content ol { margin: 0 0 0 1.5rem; }
.course-content ul { list-style: disc; }
.course-content ol { list-style: decimal; }
.course-content li { margin-bottom: .45rem; }
.course-content a { color: var(--color-primary); text-decoration: underline; text-decoration-color: rgba(37,99,235,.35); text-underline-offset: 3px; }
.course-content a:hover { color: var(--color-primary-dark); text-decoration-color: var(--color-primary-dark); }
.course-content code { font-family: var(--font-mono); font-size: .85em; background: #f1f5f9; padding: .18em .5em; border-radius: var(--radius-sm); color: #c026d3; border: 1px solid #e2e8f0; }
.course-content pre { background: #0d1117; color: #e2e8f0; padding: 1.5rem 1.75rem; border-radius: var(--radius-lg); overflow-x: auto; margin: 0; font-size: .875rem; line-height: 1.7; border: 1px solid rgba(255,255,255,.06); }
.course-content pre code { background: none; color: inherit; padding: 0; border: none; }
.course-content img { border-radius: var(--radius-lg); margin: 0 auto; box-shadow: var(--shadow); }
.course-content blockquote { border-left: 3px solid var(--color-accent); margin: 0; padding: 1.25rem 1.75rem; background: linear-gradient(135deg, rgba(6,182,212,.05) 0%, rgba(37,99,235,.04) 100%); border-radius: 0 var(--radius-lg) var(--radius-lg) 0; color: #334155; font-style: italic; }

/* ============================================================
   CONTACT FORM
   ============================================================ */
.contact-layout {
    max-width: 620px;
    margin: 0 auto;
}

.contact-form { display: flex; flex-direction: column; gap: 1.25rem; }

.form-group { display: flex; flex-direction: column; gap: .4rem; }

.form-group label {
    font-weight: 600;
    font-size: .85rem;
    color: var(--color-text);
    letter-spacing: -.01em;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: .75rem 1.1rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: .95rem;
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color .2s, box-shadow .2s;
    outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.form-group textarea { resize: vertical; min-height: 148px; }

.form-group--checkbox label {
    display: flex;
    align-items: flex-start;
    gap: .65rem;
    font-weight: 400;
    font-size: .875rem;
    cursor: pointer;
    line-height: 1.55;
}
.form-group--checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    font-size: .9rem;
    margin-bottom: 1.5rem;
}
.alert--success {
    background: #f0fdf4;
    color: #14532d;
    border: 1.5px solid #86efac;
}
.alert--error {
    background: #fef2f2;
    color: #991b1b;
    border: 1.5px solid #fca5a5;
}

/* ============================================================
   ADSENSE BLOCKS
   ============================================================ */
.adsense-block {
    margin: 2.5rem 0;
    text-align: center;
    min-height: 90px;
    background: var(--color-bg-gray);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--color-border);
}
.adsense-top { margin-top: 2rem; margin-bottom: 2.5rem; }
.adsense-bottom { margin-top: 2.5rem; }

/* ============================================================
   COOKIE BANNER
   ============================================================ */
.cookie-banner {
    position: fixed;
    bottom: 1.25rem;
    left: 1.25rem;
    right: 1.25rem;
    z-index: 999;
    background: rgba(4,13,26,.95);
    color: #e2e8f0;
    box-shadow: 0 8px 40px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.06);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 2.5rem);
}

.cookie-banner__content {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.cookie-banner__content p {
    margin: 0;
    font-size: .875rem;
    line-height: 1.65;
    flex: 1;
    min-width: 240px;
    color: #94a3b8;
}

.cookie-banner__content a { color: #60a5fa; text-decoration: underline; }

.cookie-banner__actions {
    display: flex;
    gap: .75rem;
    align-items: center;
    flex-wrap: wrap;
    flex-shrink: 0;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
    .post-card {
        grid-template-columns: 200px 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
    :root { --header-height: 58px; }

    .nav-toggle { display: flex; }

    #main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(255,255,255,.97);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        padding: .75rem 1.25rem 1.25rem;
    }
    #main-nav.is-open { display: block; }
    #main-nav ul { flex-direction: column; gap: .1rem; }
    #main-nav a { padding: .7rem .85rem; font-size: .95rem; }

    .site-header { position: sticky; overflow: visible; }

    .hero { padding: 4rem 0 3.5rem; }
    .hero h1 { font-size: clamp(1.75rem, 7vw, 2.5rem); }

    .section { padding-top: 3rem; padding-bottom: 3rem; }

    .post-card {
        grid-template-columns: 1fr;
    }
    .post-card__image {
        min-height: 200px;
        max-height: 240px;
        width: 100%;
    }
    .post-card__body { padding: 1.25rem; }
    .post-card::after { display: none; }

    .footer-grid { grid-template-columns: 1fr; }
    .footer-brand { grid-column: 1; }

    .grid--3 { grid-template-columns: 1fr; }

    .cookie-banner {
        bottom: .75rem;
        left: .75rem;
        right: .75rem;
        width: calc(100% - 1.5rem);
        border-radius: var(--radius-lg);
        padding: 1rem 1.1rem;
    }
    .cookie-banner__content { flex-direction: column; gap: .9rem; }
    .cookie-banner__actions { width: 100%; justify-content: stretch; flex-direction: column; }
    .cookie-banner__actions .btn-primary,
    .cookie-banner__actions .btn-secondary,
    .cookie-banner__actions .btn-link { width: 100%; text-align: center; }

    .post-single, .course-single { padding: 2.5rem 0 4rem; }
    .contact-layout { max-width: 100%; }

    .about-cta { flex-direction: column; }
}

/* ============================================================
   ERROR PAGES
   ============================================================ */
.error-page {
    min-height: 65vh;
    display: flex;
    align-items: center;
    padding: 5rem 0;
    background: radial-gradient(ellipse at center, rgba(37,99,235,.04) 0%, transparent 65%);
}

.error-page__content {
    text-align: center;
    max-width: 540px;
    margin: 0 auto;
}

.error-page__code {
    font-size: clamp(5rem, 16vw, 10rem);
    font-weight: 900;
    line-height: 1;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: .5rem;
    letter-spacing: -.04em;
}

.error-page__content h1 {
    font-size: 1.75rem;
    margin-bottom: .85rem;
}

.error-page__content p {
    color: var(--color-text-muted);
    font-size: 1rem;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.error-page__actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================================
   SERVICIOS PAGE
   ============================================================ */
.services-intro {
    max-width: 680px;
    margin: 0 auto 3.5rem;
    text-align: center;
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.8;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.service-card {
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: box-shadow .25s, transform .25s, border-color .25s;
    position: relative;
    overflow: hidden;
}
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .3s;
}
.service-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: rgba(37,99,235,.2);
}
.service-card:hover::before { transform: scaleX(1); }

.service-card__icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.service-card h2 {
    font-size: 1.1rem;
    margin-bottom: .65rem;
    border: none;
    padding: 0;
    letter-spacing: -.02em;
}

.service-card p {
    font-size: .875rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.65;
}

.service-card ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.service-card li {
    font-size: .855rem;
    color: var(--color-text-muted);
    padding: .22rem 0 .22rem 1.2rem;
    position: relative;
}
.service-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: .8rem;
}

.services-cta {
    text-align: center;
    background: linear-gradient(135deg, rgba(37,99,235,.05) 0%, rgba(6,182,212,.05) 100%);
    border: 1.5px solid rgba(37,99,235,.15);
    border-radius: var(--radius-xl);
    padding: 3.5rem 2rem;
}
.services-cta h2 { margin-bottom: .6rem; border: none; padding: 0; }
.services-cta p { color: var(--color-text-muted); margin-bottom: 1.75rem; }

/* ============================================================
   SOBRE MI PAGE
   ============================================================ */
.about-layout {
    max-width: 800px;
    margin: 0 auto;
}

.about-content h2 {
    font-size: 1.45rem;
    margin-top: 2.75rem;
    margin-bottom: .85rem;
    padding-bottom: .4rem;
    border-bottom: 2px solid var(--color-border);
    letter-spacing: -.025em;
}
.about-content h2:first-child { margin-top: 0; }

.about-content p {
    font-size: 1.05rem;
    line-height: 1.85;
    color: #1e293b;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin: 1rem 0 1.5rem;
}

.skill-badge {
    background: rgba(37,99,235,.07);
    color: var(--color-primary);
    border: 1.5px solid rgba(37,99,235,.18);
    padding: .35rem .9rem;
    border-radius: 100px;
    font-size: .82rem;
    font-weight: 650;
    letter-spacing: -.01em;
    transition: background .15s, border-color .15s;
}
.skill-badge:hover {
    background: rgba(37,99,235,.13);
    border-color: rgba(37,99,235,.3);
}

.about-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   LEGAL PAGES
   ============================================================ */
.legal-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: .975rem;
    line-height: 1.85;
}

.legal-content h2 {
    font-size: 1.3rem;
    margin-top: 2.75rem;
    margin-bottom: .7rem;
    padding-bottom: .35rem;
    border-bottom: 2px solid var(--color-border);
    letter-spacing: -.02em;
}

.legal-content h3 {
    font-size: 1.05rem;
    margin-top: 1.75rem;
    margin-bottom: .4rem;
}

.legal-content ul {
    margin: .75rem 0 1rem 1.5rem;
    list-style: disc;
}

.legal-content li { margin-bottom: .4rem; }

.legal-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.legal-update {
    margin-top: 3.5rem;
    font-size: .82rem;
    color: var(--color-text-light);
    border-top: 1px solid var(--color-border);
    padding-top: 1.25rem;
}

/* Cookies table */
.cookies-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0;
    font-size: .875rem;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
}
.cookies-table th, .cookies-table td {
    padding: .65rem 1rem;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    vertical-align: top;
}
.cookies-table th {
    background: var(--color-bg-gray);
    font-weight: 700;
    font-size: .78rem;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--color-text-muted);
    white-space: nowrap;
}
.cookies-table tr:last-child td { border-bottom: none; }
.cookies-table code {
    font-family: var(--font-mono);
    font-size: .82em;
    background: #f1f5f9;
    padding: .1em .4em;
    border-radius: 3px;
    border: 1px solid var(--color-border);
}

/* ============================================================
   UTILITIES
   ============================================================ */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}