@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ===== DESIGN TOKENS (matches landing page) ===== */
:root {
    --bg:          #f7f4ec;
    --paper:       #fffdf7;
    --panel:       rgba(255, 253, 247, 0.82);
    --panel-2:     #f0eadf;
    --ink:         #161a22;
    --muted:       #596273;
    --soft:        #8790a0;
    --line:        rgba(22, 26, 34, 0.1);
    --line-strong: rgba(22, 26, 34, 0.18);
    --blue:        #2257d6;
    --cyan:        #047c9b;
    --green:       #16803d;
    --amber:       #b86500;
    --red:         #c24b4b;
    --radius:      22px;
    --radius-sm:   14px;
    --shadow:      0 24px 70px rgba(44, 37, 25, 0.12);
    --transition:  all 0.2s ease;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
    min-height: 100vh;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.65;
    color: var(--muted);
    background:
        radial-gradient(circle at 18% 0%, rgba(34, 87, 214, 0.14), transparent 32%),
        radial-gradient(circle at 84% 10%, rgba(22, 128, 61, 0.11), transparent 30%),
        linear-gradient(180deg, #fffdf7 0%, #f7f4ec 52%, #f2ede3 100%);
    -webkit-font-smoothing: antialiased;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(rgba(22, 26, 34, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 26, 34, 0.035) 1px, transparent 1px);
    background-size: 76px 76px;
    mask-image: radial-gradient(circle at 50% 12%, #000, transparent 78%);
}

a { color: var(--ink); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--blue); }

p { color: var(--muted); line-height: 1.7; }

h1, h2, h3 {
    color: var(--ink);
    line-height: 1.04;
    letter-spacing: -0.055em;
}

.serif { font-family: 'Instrument Serif', Georgia, serif; font-weight: 400; }
.mono  { font-family: 'JetBrains Mono', monospace; }

.container {
    width: min(1180px, calc(100% - 44px));
    margin: 0 auto;
}

/* ===== NAV ===== */
header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 50;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 253, 247, 0.78);
    backdrop-filter: blur(22px);
}

nav .nav-container {
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.nav-back {
    font: 700 0.72rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    padding: 8px 11px;
    border-radius: 999px;
}
.nav-back:hover { background: rgba(34, 87, 214, 0.08); color: var(--blue); opacity: 1; }

.nav-brand {
    font-weight: 800;
    color: var(--ink);
    letter-spacing: -0.04em;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 4px;
}

nav ul a {
    color: var(--muted);
    font: 700 0.72rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 8px 11px;
    border-radius: 999px;
    transition: var(--transition);
}
nav ul a:hover { background: rgba(34, 87, 214, 0.08); color: var(--blue); opacity: 1; }

.search-container { flex-shrink: 0; }

.search-container input {
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 253, 247, 0.82);
    color: var(--ink);
    outline: none;
    width: 200px;
    font: 500 0.82rem 'JetBrains Mono', monospace;
    transition: var(--transition);
}
.search-container input::placeholder { color: var(--soft); }
.search-container input:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(34, 87, 214, 0.1);
}

/* ===== HERO ===== */
.hero {
    padding: 138px 0 70px;
    text-align: center;
    border-bottom: 1px solid var(--line);
    position: relative;
}

.blog-hero { padding: 148px 0 80px; }

.hero-eyebrow {
    display: inline-block;
    font: 800 0.72rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--blue);
    margin-bottom: 16px;
    border: 1px solid rgba(34, 87, 214, 0.2);
    background: rgba(34, 87, 214, 0.06);
    padding: 6px 14px;
    border-radius: 999px;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--ink);
    line-height: 1.04;
}

.hero-accent {
    color: var(--amber);
    font-style: italic;
    letter-spacing: -0.025em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: #3f4858;
    max-width: 680px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.stat {
    text-align: center;
    padding: 16px 22px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: linear-gradient(180deg, rgba(255, 253, 247, 0.96), rgba(246, 241, 230, 0.94));
    box-shadow: 0 12px 30px rgba(44, 37, 25, 0.08);
    min-width: 130px;
}

.stat h3 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--amber);
    margin-bottom: 4px;
    line-height: 1;
}

.stat p {
    font: 700 0.68rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--soft);
    margin: 0;
}

/* ===== FILTER BAR ===== */
.filter-bar { margin-bottom: 2.5rem; }

.blog-filters {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 253, 247, 0.7);
    color: var(--muted);
    cursor: pointer;
    font: 700 0.7rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    transition: var(--transition);
}

.filter-btn:hover {
    background: rgba(34, 87, 214, 0.08);
    border-color: rgba(34, 87, 214, 0.2);
    color: var(--blue);
}

.filter-btn.active {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
    font-weight: 700;
}

/* ===== BLOG GRID ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
}

/* ===== BLOG CARD ===== */
.blog-card {
    min-height: 280px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: linear-gradient(180deg, rgba(255, 253, 247, 0.96), rgba(246, 241, 230, 0.94));
    padding: 24px;
    box-shadow: 0 18px 55px rgba(44, 37, 25, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.blog-card::after {
    content: '';
    position: absolute;
    width: 170px;
    height: 170px;
    right: -75px;
    top: -75px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(34, 87, 214, 0.12), transparent 66%);
    pointer-events: none;
}

.blog-card:hover {
    transform: translateY(-2px);
    border-color: rgba(34, 87, 214, 0.22);
}

.blog-card.hidden { display: none; }

.blog-card-header {
    padding: 0 0 14px;
}

.blog-category-badge {
    display: inline-block;
    font: 800 0.7rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--amber);
    border: 1px solid rgba(184, 101, 0, 0.2);
    background: rgba(184, 101, 0, 0.06);
    padding: 4px 10px;
    border-radius: 4px;
}

.blog-content {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.blog-content h3 {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 10px;
    line-height: 1.15;
}

.blog-content p {
    font-size: 0.92rem;
    color: var(--muted);
    margin-bottom: 16px;
    flex: 1;
    line-height: 1.65;
}

/* ===== TAGS ===== */
.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: 16px;
}

.tag {
    display: inline-flex;
    padding: 5px 9px;
    border-radius: 999px;
    border: 1px solid rgba(34, 87, 214, 0.13);
    color: #43506a;
    background: rgba(34, 87, 214, 0.045);
    font: 600 0.68rem 'JetBrains Mono', monospace;
}

/* ===== READ MORE ===== */
.read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--line-strong);
    color: var(--ink);
    border-radius: 999px;
    font-weight: 800;
    font-size: 0.8rem;
    background: rgba(255, 253, 247, 0.64);
    transition: var(--transition);
    align-self: flex-start;
    margin-top: auto;
}

.read-more:hover {
    border-color: var(--blue);
    color: var(--blue);
    transform: translateY(-1px);
    opacity: 1;
}

/* ===== MAIN CONTENT ===== */
main { min-height: calc(100vh - 140px); }

.blogs-listing { padding: 82px 0; }

/* ===== FOOTER ===== */
footer {
    padding: 38px 0 54px;
    border-top: 1px solid var(--line);
}

footer p { color: var(--soft); font-size: 0.86rem; }

.site-footer {
    padding: 38px 0 54px;
    border-top: 1px solid var(--line);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.footer-left strong { color: var(--ink); font-weight: 800; }

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--muted);
    font: 700 0.72rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.footer-links a:hover { color: var(--blue); opacity: 1; }

.footer-muted { color: var(--soft); font-size: 0.85rem; }

/* ===== PAGE HEADER (for sub-pages) ===== */
.page-header {
    padding: 138px 0 60px;
    border-bottom: 1px solid var(--line);
    text-align: center;
}

.page-header h1 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    margin-bottom: 14px;
}

.page-header p {
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
    color: #3f4858;
}

/* ===== CONTENT SECTIONS ===== */
.intro, .features, .content {
    padding: 82px 0;
}

.post-content p { margin-bottom: 1rem; }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.feature {
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 24px;
    box-shadow: 0 12px 35px rgba(44, 37, 25, 0.07);
    transition: var(--transition);
}

.feature:hover { border-color: rgba(34, 87, 214, 0.2); }

.feature h3 { font-size: 1rem; margin-bottom: 8px; }
.feature p { font-size: 0.9rem; }

.stages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.stage {
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 24px;
}

.stage h3 { font-size: 0.95rem; margin-bottom: 8px; }
.stage p { font-size: 0.875rem; }

.formula {
    background: linear-gradient(135deg, rgba(34, 87, 214, 0.055), rgba(22, 128, 61, 0.045));
    border-left: 3px solid var(--blue);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 16px 20px;
    margin: 1.5rem 0;
    color: #465166;
    font-size: 0.95rem;
}

.highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.highlight {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: rgba(247, 244, 236, 0.74);
    padding: 24px;
}

.highlight h3 a { font-size: 1rem; }
.highlight p { font-size: 0.9rem; }

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.post-meta span {
    font: 700 0.66rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
    background: rgba(255, 253, 247, 0.82);
    border: 1px solid var(--line);
    padding: 6px 12px;
    border-radius: 999px;
}

/* ===== DATA TABLES ===== */
.weights-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: rgba(255, 253, 247, 0.9);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--line);
}

.weights-table th, .weights-table td {
    border-bottom: 1px solid var(--line);
    padding: 12px 16px;
    text-align: left;
}

.weights-table th {
    color: var(--soft);
    font: 800 0.66rem 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    background: rgba(22, 26, 34, 0.035);
}

.weights-table tr:last-child td { border-bottom: none; }

.variable-name { color: var(--blue); font-weight: 700; }

/* Team */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.team-member {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 20px;
    text-align: center;
}

.team-member h4 { margin-bottom: 4px; }
.team-member p { font-size: 0.875rem; }

/* Data sources */
.data-sources {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.data-source {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 20px;
}

.data-source h4 { font-size: 0.95rem; margin-bottom: 6px; }
.data-source p { font-size: 0.85rem; }

.ui-components {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.ui-component {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 20px;
}

.results-preview {
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 24px;
    margin: 1.5rem 0;
    box-shadow: 0 12px 35px rgba(44, 37, 25, 0.07);
}

.tech-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin: 1.5rem 0;
}

.tech-option {
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 20px;
}

.tech-option.recommended {
    border-color: var(--green);
    background: rgba(22, 128, 61, 0.04);
}

.trajectory-preview {
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: rgba(255, 253, 247, 0.9);
    padding: 24px;
    margin: 1.5rem 0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--panel-2);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--blue), var(--green));
    transition: width 0.6s ease;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 980px) {
    .blog-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-stats { gap: 10px; }
}

@media (max-width: 768px) {
    .blog-grid { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 2rem; }
    .stat { min-width: 100px; padding: 14px; }
    .stat h3 { font-size: 1.3rem; }
    .nav-brand { display: none; }
    .footer-inner { flex-direction: column; text-align: center; }
    .footer-left { align-items: center; }
    .blog-hero { padding: 118px 0 50px; }
    .search-container input { width: 160px; }
    nav ul { gap: 2px; }
    .filter-btn { font-size: 0.68rem; padding: 6px 10px; }
    nav .nav-container { gap: 10px; }
    .blogs-listing { padding: 62px 0; }
}

@media (max-width: 560px) {
    .container { width: min(100% - 28px, 1180px); }
    .hero { padding-top: 116px; }
    .blog-card-header { padding: 0 0 10px; }
    .blog-content { padding: 0; }
    .search-container { display: none; }
    .stats-strip { grid-template-columns: 1fr; }
}

/* ===== UTILITY ===== */
.mb-2 { margin-bottom: 8px; }
.mt-3 { margin-top: 12px; }
.text-center { text-align: center; }