/* ===== Brewer Rocketry — Stylesheet ===== */
/* Design: Dark, modern, aerospace-inspired. Lightweight, no frameworks. */

:root {
    --bg: #0a0a0f;
    --bg-alt: #12121f;
    --bg-card: #1a1a2e;
    --surface: #16213e;
    --accent: #e94560;
    --accent-glow: rgba(233, 69, 96, 0.4);
    --accent-2: #0f3460;
    --text: #eee;
    --text-dim: #999;
    --text-bright: #fff;
    --border: rgba(255,255,255,0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --max-width: 1100px;
    --font-head: 'Space Grotesk', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-head);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--text-bright); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Navbar ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: padding .3s;
}
.navbar.scrolled { padding: 4px 0; }
.nav-container {
    max-width: var(--max-width); margin: 0 auto;
    padding: 16px 24px;
    display: flex; justify-content: space-between; align-items: center;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: 1px; color: var(--text-bright); }
.logo-icon { font-size: 24px; }
.nav-menu { display: flex; gap: 28px; list-style: none; }
.nav-menu a { color: var(--text-dim); font-size: 15px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; transition: color .2s; }
.nav-menu a:hover, .nav-menu a.active { color: var(--text-bright); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

/* ===== Hero ===== */
.hero {
    min-height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center;
    text-align: center; position: relative; overflow: hidden;
    padding: 100px 24px 60px;
}
.hero-bg {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 50% 30%, rgba(15, 52, 96, 0.5), transparent 60%),
                radial-gradient(ellipse at 80% 70%, rgba(233, 69, 96, 0.15), transparent 50%);
    z-index: 0;
}
/* Subtle starfield */
.hero-bg::before {
    content: ''; position: absolute; inset: 0;
    background-image: 
        radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.6), transparent),
        radial-gradient(1px 1px at 60% 70%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 85% 20%, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 15% 80%, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 45% 50%, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 75% 40%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 35% 15%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 90% 85%, rgba(255,255,255,0.4), transparent);
    background-size: 100% 100%;
}
.hero-content { position: relative; z-index: 1; }
.hero-badge {
    display: inline-block; padding: 8px 20px;
    background: rgba(233, 69, 96, 0.1); border: 1px solid rgba(233, 69, 96, 0.3);
    border-radius: 100px; font-size: 13px; font-weight: 500; letter-spacing: 1px;
    color: var(--accent); margin-bottom: 32px;
}
.hero-title {
    font-size: clamp(2.5rem, 7vw, 5.5rem); font-weight: 700;
    line-height: 1.05; letter-spacing: -1px;
    background: linear-gradient(180deg, var(--text-bright) 0%, var(--text-dim) 100%);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 24px;
}
.hero-subtitle { font-size: clamp(1rem, 2vw, 1.2rem); color: var(--text-dim); max-width: 580px; margin: 0 auto 40px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
    display: inline-block; padding: 14px 32px; border-radius: var(--radius-sm);
    font-weight: 600; font-size: 15px; letter-spacing: 0.5px; cursor: pointer;
    transition: all .2s; border: none; text-transform: uppercase;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #ff5575; color: #fff; box-shadow: 0 0 30px var(--accent-glow); transform: translateY(-2px); }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--text); color: var(--text-bright); }

.hero-stats {
    display: flex; gap: 48px; margin-top: 64px; position: relative; z-index: 1;
    flex-wrap: wrap; justify-content: center;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 2rem; font-weight: 700; color: var(--text-bright); }
.stat-label { font-size: 13px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }

/* ===== Sections ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { font-size: 2rem; font-weight: 700; margin-bottom: 40px; text-align: center; }

/* ===== Cards ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.card {
    background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--border); transition: transform .2s, box-shadow .2s;
    display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.4); border-color: rgba(233, 69, 96, 0.3); }
.card-image {
    height: 180px; display: flex; align-items: center; justify-content: center;
    position: relative; overflow: hidden;
}
.card-image-text { font-size: 1.5rem; font-weight: 700; color: rgba(255,255,255,0.9); letter-spacing: 2px; z-index: 1; }
.card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { font-size: 1.3rem; margin-bottom: 8px; color: var(--text-bright); }
.card-body p { color: var(--text-dim); font-size: 14px; flex: 1; margin-bottom: 16px; }
.card-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
    font-size: 12px; padding: 4px 12px; border-radius: 100px;
    background: rgba(233, 69, 96, 0.1); color: var(--accent);
    border: 1px solid rgba(233, 69, 96, 0.2);
    font-family: var(--font-mono);
}

/* ===== Feature Grid ===== */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 32px; }
.feature { text-align: center; padding: 24px; }
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature h3 { font-size: 1.2rem; margin-bottom: 8px; color: var(--text-bright); }
.feature p { color: var(--text-dim); font-size: 14px; }

/* ===== Footer ===== */
.footer { padding: 40px 0; text-align: center; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 14px; }

/* ===== Build Pages ===== */
.page-header {
    padding: 140px 0 60px; text-align: center;
    background: radial-gradient(ellipse at 50% 0%, var(--surface), transparent 70%);
}
.page-header h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; color: var(--text-bright); margin-bottom: 12px; }
.page-header p { color: var(--text-dim); max-width: 600px; margin: 0 auto; }

.build-detail { padding: 60px 0; }
.build-detail .container { max-width: 800px; }
.spec-table {
    width: 100%; border-collapse: collapse; margin: 24px 0;
    font-family: var(--font-mono); font-size: 14px;
}
.spec-table th { text-align: left; padding: 12px 16px; background: var(--surface); color: var(--text-bright); border: 1px solid var(--border); }
.spec-table td { padding: 12px 16px; border: 1px solid var(--border); color: var(--text-dim); }
.spec-table td:first-child { color: var(--text); font-weight: 500; }

.prose { max-width: 800px; margin: 0 auto; }
.prose h2 { font-size: 1.6rem; margin: 40px 0 16px; color: var(--text-bright); }
.prose h3 { font-size: 1.2rem; margin: 32px 0 12px; color: var(--text-bright); }
.prose p { margin-bottom: 16px; color: var(--text); }
.prose ul, .prose ol { margin: 0 0 16px 24px; }
.prose li { margin-bottom: 8px; }
.prose code { font-family: var(--font-mono); background: var(--surface); padding: 2px 8px; border-radius: 4px; font-size: 0.9em; color: var(--accent); }
.callout {
    background: var(--surface); border-left: 3px solid var(--accent);
    padding: 20px 24px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 24px 0;
}
.callout-title { font-weight: 600; color: var(--text-bright); margin-bottom: 8px; }
.callout p { margin: 0; color: var(--text-dim); }

/* ===== Model Gallery ===== */
.model-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.model-card {
    background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--border); transition: transform .2s, box-shadow .2s;
}
.model-card:hover { transform: translateY(-4px); border-color: rgba(233, 69, 96, 0.3); }
.model-preview { height: 220px; display: flex; align-items: center; justify-content: center; background: var(--surface); }
.model-info { padding: 20px; }
.model-info h3 { font-size: 1.2rem; color: var(--text-bright); margin-bottom: 4px; }
.model-info p { color: var(--text-dim); font-size: 14px; margin-bottom: 16px; }
.model-downloads { display: flex; gap: 8px; }
.dl-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px; border-radius: var(--radius-sm);
    font-size: 13px; font-weight: 500; font-family: var(--font-mono);
    transition: all .2s;
}
.dl-stl { background: var(--accent); color: #fff; }
.dl-stl:hover { background: #ff5575; color: #fff; }
.dl-scad { background: transparent; color: var(--text); border: 1px solid var(--border); }
.dl-scad:hover { border-color: var(--text); color: var(--text-bright); }

/* ===== Resources ===== */
.calc-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 32px; max-width: 500px; margin: 0 auto;
}
.calc-card h3 { color: var(--text-bright); margin-bottom: 20px; text-align: center; }
.calc-form { display: grid; gap: 16px; }
.calc-form label { font-size: 14px; color: var(--text-dim); font-weight: 500; }
.calc-form input {
    background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: 12px 16px; color: var(--text-bright); font-family: var(--font-mono); font-size: 16px;
}
.calc-form input:focus { outline: none; border-color: var(--accent); }
.calc-result {
    margin-top: 24px; padding: 20px; border-radius: var(--radius-sm);
    background: var(--surface); text-align: center;
}
.calc-result .result-value { font-size: 2rem; font-weight: 700; color: var(--accent); font-family: var(--font-mono); }
.calc-result .result-label { font-size: 13px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }
.calc-note { font-size: 13px; color: var(--text-dim); text-align: center; margin-top: 16px; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-menu {
        position: fixed; top: 60px; right: -100%; width: 100%; height: calc(100vh - 60px);
        background: var(--bg); flex-direction: column; padding: 40px; gap: 20px;
        transition: right .3s;
    }
    .nav-menu.active { right: 0; }
    .hero-stats { gap: 24px; }
    .stat-num { font-size: 1.5rem; }
}