:root {
    --accent: #ff5a1f; /* Оранжевый акцент как на промышленных сайтах */
    --text-main: #0f172a;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --border: #e2e8f0;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Navigation */
.main-nav {
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky; top: 0; z-index: 1000;
}
.nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 800; font-size: 1.5rem; letter-spacing: -1px; }
.logo span { color: var(--accent); }
.nav-links { display: flex; list-style: none; gap: 32px; }
.nav-links a { text-decoration: none; color: var(--text-main); font-weight: 600; font-size: 0.9rem; }

/* Hero */
.main-hero { padding: 120px 0 80px; background: var(--bg-light); border-bottom: 1px solid var(--border); }
.category-tag { color: var(--accent); font-weight: 800; text-transform: uppercase; font-size: 0.75rem; letter-spacing: 1.5px; }
.main-hero h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 900; margin: 24px 0; line-height: 1.05; letter-spacing: -2px; }
.main-hero h1 span { color: var(--accent); }
.hero-desc { font-size: 1.25rem; color: var(--text-muted); max-width: 650px; }

/* Sections */
.section { padding: 100px 0; }
.section-header { margin-bottom: 60px; max-width: 700px; }
.section-header h2 { font-size: 2.5rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 12px; }

.parts-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.part-item { background: var(--white); }
.part-img img { width: 100%; height: 350px; object-fit: cover; border-radius: 16px; margin-bottom: 24px; }
.part-num { color: var(--accent); font-weight: 900; font-size: 1rem; margin-bottom: 8px; display: block; }
.part-content h3 { font-size: 1.5rem; margin-bottom: 12px; }

/* Video Box */
.video-featured { display: grid; grid-template-columns: 1fr 1.5fr; background: #0f172a; color: var(--white); border-radius: 24px; overflow: hidden; }
.v-info { padding: 60px; display: flex; flex-direction: column; justify-content: center; }
.v-tag { color: var(--accent); font-weight: 700; font-size: 0.8rem; text-transform: uppercase; margin-bottom: 16px; }
.v-player iframe { width: 100%; min-height: 450px; border: none; }
.play-btn { background: var(--accent); border: none; color: white; padding: 14px 28px; border-radius: 8px; font-weight: 700; margin-top: 32px; width: fit-content; }

/* Clean Table & Calc */
.calc-card { background: var(--white); border: 1px solid var(--border); border-radius: 24px; padding: 48px; box-shadow: 0 10px 30px rgba(0,0,0,0.02); }
.cdn-badge { background: #fee2e2; color: #ef4444; padding: 4px 10px; border-radius: 6px; font-size: 0.7rem; font-weight: 700; }
.clean-table { width: 100%; border-collapse: collapse; margin-top: 40px; }
.clean-table th { text-align: left; padding: 20px; border-bottom: 2px solid #f1f5f9; font-size: 0.85rem; color: var(--text-muted); }
.clean-table td { padding: 20px; border-bottom: 1px solid #f1f5f9; }

.price-input, .qty-input { border: 1px solid var(--border); padding: 10px; border-radius: 8px; width: 80px; font-family: inherit; font-weight: 600; }
.ali-link { color: var(--accent); text-decoration: none; font-weight: 700; transition: 0.2s; }
.ali-link:hover { opacity: 0.7; }

.calc-footer { margin-top: 48px; border-top: 2px solid #f1f5f9; padding-top: 32px; text-align: right; }
.calc-footer strong { font-size: 3.5rem; font-weight: 900; color: var(--text-main); letter-spacing: -2px; }
.cur { font-size: 1.5rem; color: var(--accent); font-weight: 800; }

/* Reveal Animation */
.reveal { opacity: 0; transform: translateY(30px); transition: 1s ease-out; }
.reveal.active { opacity: 1; transform: translateY(0); }

.btn-primary { background: var(--text-main); color: white; padding: 12px 24px; border-radius: 10px; text-decoration: none; font-weight: 700; transition: 0.3s; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.1); }