/* PREMIUM MONOCHROME THEME - POLESTAR MINIMALISM */
:root {
    --bg-color: #ffffff;
    --text-main: #000000;
    --text-muted: #666666;
    --border-color: #1a1a1a;
    --strava-orange: #fc4c02;
    --container-max: 1400px; /* Wide Polestar containment */
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 6rem;
}

.mono { font-family: 'Roboto Mono', monospace; letter-spacing: 0.05em; }

/* STICKY NAV */
.sticky-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #f0f0f0;
    padding: 2rem 0;
}

.nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
.nav { display: flex; gap: 4rem; }
.nav a {
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* HERO SECTION */
.hero-section {
    padding-top: 20rem;
    padding-bottom: 15rem;
}

.hero-title {
    font-size: 8rem;
    line-height: 0.85;
    font-weight: 900;
    letter-spacing: -0.04em;
    margin-bottom: 4rem;
}

.hero-subtitle {
    font-size: 1.8rem;
    max-width: 900px;
    color: var(--text-muted);
}

/* TECHNICAL HUB AREA */
.tech-hub-area {
    background: #000000;
    color: #ffffff;
    padding: 15rem 0;
}

.tech-header {
    margin-bottom: 10rem;
    border-top: 1px solid #333;
    padding-top: 2rem;
}

.tech-main-title {
    font-size: 5rem;
    font-weight: 900;
    margin-top: 1.5rem;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem;
}

.tech-card {
    border: 1px solid #222;
    padding: 4rem;
    display: flex;
    flex-direction: column;
    transition: border-color 0.3s;
}

.tech-card:hover { border-color: #555; }
.tech-card-wide { grid-column: span 2; }

.tech-tag {
    font-size: 0.7rem;
    color: #555;
    margin-bottom: 2rem;
}

.tech-card h3 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 2rem;
    text-transform: uppercase;
}

.tech-card p {
    font-size: 1.1rem;
    color: #888;
    margin-bottom: 3rem;
    line-height: 1.7;
}

.mono-specs {
    background: #0a0a0a;
    border: 1px solid #1a1a1a;
    padding: 2rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    color: #ffffff;
    line-height: 2;
}

/* EXTENSION GUIDE */
.extension-guide-grid {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 4rem;
    margin-top: 2rem;
    padding-top: 3rem;
    border-top: 1px solid #1a1a1a;
}

.guide-text { font-size: 0.85rem; color: #666; line-height: 2; }

/* BUTTONS */
.btn {
    display: inline-block;
    padding: 1.2rem 2.5rem;
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: 0.3s;
    border: none;
    text-align: center;
}

.btn-secondary { border: 1px solid #fff; color: #fff; background: transparent; }
.btn-secondary:hover { background: #fff; color: #000; }
.btn-cta { background: var(--strava-orange); color: #fff; }

/* SECTIONS */
.section { padding: 15rem 0; }
.section-header { margin-bottom: 8rem; border-top: 1px solid #000; padding-top: 2rem; }
.title { font-size: 3.5rem; font-weight: 900; text-transform: uppercase; }

/* PROJECT CARDS */
.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6rem; }
.project-card { background: #fafafa; padding: 5rem; border: 1px solid #eee; transition: 0.4s; }
.project-card.large { grid-column: span 2; }
.project-card:hover { transform: translateY(-10px); background: #f5f5f5; }

/* FOOTER */
.footer-contact { padding-bottom: 10rem; }
.footer-title { font-size: 10rem; font-weight: 900; letter-spacing: -0.05em; }
.contact-links { display: flex; gap: 4rem; margin-top: 4rem; }
.large-link { font-size: 3.5rem; font-weight: 800; text-decoration: none; color: #000; transition: transform 0.3s; }
.large-link:hover { transform: translateX(20px); }
.footer-meta { margin-top: 12rem; color: #999; font-size: 0.7rem; text-transform: uppercase; }

/* TECHNICAL SPECS & STATUS */
.tech-status-row {
    font-size: 0.75rem;
    color: #444;
    border-bottom: 1px solid #111;
    padding-bottom: 1rem;
    margin-bottom: 4rem;
    text-transform: uppercase;
}

.tech-spec-box {
    background: #0a0a0a;
    border: 1px solid #1a1a1a;
    padding: 2rem;
    margin-top: 1rem;
}

.tech-spec-box p {
    font-size: 0.85rem !important;
    color: #fff !important;
    margin-bottom: 0.5rem !important;
    line-height: 1.8 !important;
}

.tech-spec-box p:last-child {
    margin-bottom: 0 !important;
}

.strava-orange {
    color: var(--strava-orange);
    font-weight: 700;
}

/* TECHNICAL PROOF GALLERY */
.tech-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 6rem;
}

.gallery-item {
    background: #0a0a0a;
    border: 1px solid #1a1a1a;
    overflow: hidden;
    transition: all 0.4s ease;
}

.gallery-item:hover {
    border-color: #555;
    transform: translateY(-5px);
}

.gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    filter: grayscale(100%) contrast(120%);
    opacity: 0.7;
    transition: all 0.4s ease;
}

.gallery-item:hover img {
    opacity: 1;
    filter: grayscale(0%);
}

.gallery-caption {
    padding: 1.5rem;
    background: #000;
}

.gallery-caption h4 {
    font-size: 0.75rem;
    color: var(--strava-orange);
    margin-bottom: 0.5rem;
}

.gallery-caption p {
    font-size: 0.7rem;
    line-height: 1.4;
    color: #666;
    margin: 0;
}

/* WHITE PAPER SECTION */
.wp-container {
    background-color: #ffffff;
    padding: 10rem 0;
    border-top: 1px solid #f0f0f0;
}

.wp-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.wp-title {
    font-size: 3rem;
    font-weight: 900;
    text-transform: uppercase;
    margin-bottom: 2rem;
    color: #000;
    letter-spacing: -0.02em;
}

.wp-description {
    font-size: 1.2rem;
    color: #444;
    line-height: 1.6;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.wp-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.wp-btn {
    padding: 1.2rem 2.5rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-block;
    border: none;
}

.wp-btn-primary {
    background-color: #000;
    color: #fff;
}

.wp-btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.wp-btn-secondary {
    background-color: #f0f0f0;
    color: #000;
}

.wp-btn-secondary:hover {
    background-color: #e5e5e5;
    transform: translateY(-2px);
}

/* Inline PDF Viewer */
#pdf-viewer-wrap {
    transition: all 0.5s ease;
    overflow: hidden;
    margin-top: 2rem;
}

.pdf-hidden {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.pdf-visible {
    max-height: 1000px;
    opacity: 1;
}

.pdf-container {
    position: relative;
    width: 100%;
    height: 800px;
    background: #f9f9f9;
    border: 1px solid #eee;
    border-radius: 12px;
}

.pdf-iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 12px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .tech-gallery {
        grid-template-columns: 1fr;
    }
}
    .container { padding: 0 3rem; }
    .hero-title { font-size: 5rem; }
    .footer-title { font-size: 6rem; }
}

@media (max-width: 768px) {
    .tech-grid, .extension-guide-grid, .project-grid, .contact-links {
        grid-template-columns: 1fr;
    }
    .guide-actions { margin-top: 2rem; }
    .large-link { font-size: 2rem; }
}