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

        body {
            font-family: 'Inter', sans-serif;
            background: #0a0f1e;
            color: #eef2ff;
            line-height: 1.5;
            scroll-behavior: smooth;
        }

        /* космический градиентный фон */
        .stars-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 20% 30%, #0f172a, #030712);
            z-index: -2;
        }

        .stars-bg::before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            background-image: radial-gradient(2px 2px at 20px 40px, #ffffff20, rgba(0,0,0,0)),
                              radial-gradient(1px 1px at 80px 200px, #ffffff30, rgba(0,0,0,0));
            background-repeat: repeat;
            background-size: 200px 200px, 150px 150px;
            opacity: 0.6;
            pointer-events: none;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem 1.5rem;
            position: relative;
            z-index: 1;
        }

        /* header */
        .hero {
            text-align: center;
            margin-bottom: 3rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 2rem;
        }

        .hero h1 {
            font-family: 'Space Grotesk', monospace;
            font-size: 2.6rem;
            font-weight: 700;
            background: linear-gradient(135deg, #FFFFFF, #94a3f8, #38bdf8);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
            margin-bottom: 0.5rem;
        }

        .hero p {
            font-size: 1.2rem;
            color: #cbd5e6;
            max-width: 700px;
            margin: 0.5rem auto 0;
        }

        .org-badge {
            display: inline-block;
            background: #1e293bb3;
            backdrop-filter: blur(6px);
            padding: 0.4rem 1.2rem;
            border-radius: 40px;
            font-size: 0.9rem;
            margin-top: 1rem;
            border: 1px solid #2d3a5e;
        }

        /* навигация по дням */
        .day-nav {
            display: flex;
            gap: 1rem;
            justify-content: center;
            margin-bottom: 2.5rem;
            flex-wrap: wrap;
        }

        .day-btn {
            background: #111827cc;
            backdrop-filter: blur(8px);
            border: 1px solid #2d3a5e;
            padding: 0.7rem 2rem;
            border-radius: 60px;
            font-weight: 600;
            font-size: 1rem;
            color: #e2e8f0;
            cursor: pointer;
            transition: all 0.2s;
            font-family: inherit;
        }

        .day-btn.active {
            background: #2563eb;
            border-color: #60a5fa;
            color: white;
            box-shadow: 0 0 12px #3b82f680;
        }

        .day-btn:hover:not(.active) {
            background: #1e293b;
            border-color: #5b6e8c;
        }

        /* секции дней */
        .day-section {
            display: none;
            animation: fade 0.3s ease;
        }

        .day-section.active-day {
            display: block;
        }

        @keyframes fade {
            from { opacity: 0; transform: translateY(8px);}
            to { opacity: 1; transform: translateY(0);}
        }

        /* карточки */
        .section-card {
            background: rgba(15, 23, 42, 0.7);
            backdrop-filter: blur(12px);
            border-radius: 2rem;
            border: 1px solid rgba(71, 85, 105, 0.5);
            margin-bottom: 2.5rem;
            overflow: hidden;
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.4);
        }

        .section-header {
            background: linear-gradient(90deg, #0f172a, #111827);
            padding: 1.2rem 1.8rem;
            border-bottom: 1px solid #2d3a5e;
        }

        .section-header h2 {
            font-size: 1.7rem;
            font-weight: 600;
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .section-header h2 span {
            background: #2563eb30;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 400;
            border: 1px solid #3b82f640;
        }

        .subcat {
            font-size: 1rem;
            font-weight: 500;
            color: #94a3b8;
            margin-top: 0.3rem;
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
        }

        .online-link {
            background: #0f212e;
            padding: 0.2rem 0.8rem;
            border-radius: 30px;
            font-size: 0.75rem;
            font-family: monospace;
            color: #7dd3fc;
            text-decoration: none;
        }

        .schedule-grid {
            padding: 1rem 0;
        }

        .talk-item {
            display: grid;
            grid-template-columns: 100px 1fr auto;
            gap: 1rem;
            padding: 1rem 1.8rem;
            border-bottom: 1px solid rgba(71, 85, 105, 0.3);
            transition: background 0.15s;
            align-items: start;
        }

        .talk-item:hover {
            background: #1e293b40;
        }

        .talk-time {
            font-weight: 600;
            color: #90cdf4;
            font-family: 'Space Grotesk', monospace;
            font-size: 0.9rem;
            padding-top: 0.1rem;
        }

        .talk-info {
            flex: 1;
        }

        .talk-title {
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 0.3rem;
            color: #f1f5f9;
        }

        .talk-author {
            font-size: 0.85rem;
            color: #a5b4fc;
            margin-bottom: 0.2rem;
        }

        .talk-org {
            font-size: 0.75rem;
            color: #94a3b8;
        }

        .badge-online {
            background: #0f2c2f;
            color: #5ee0fa;
            border-radius: 20px;
            padding: 0.2rem 0.7rem;
            font-size: 0.7rem;
            font-weight: 500;
            display: inline-block;
            margin-left: 0.6rem;
            vertical-align: middle;
        }

        .talk-extra {
            text-align: right;
            min-width: 80px;
        }

        .coffee-break {
            background: #1e2a3a60;
            padding: 0.8rem 1.8rem;
            font-style: italic;
            color: #cbd5e6;
            border-left: 3px solid #f59e0b;
            font-weight: 500;
        }

        .full-dome {
            background: linear-gradient(90deg, #1e1b4b20, #2e106520);
            border-left: 3px solid #a855f7;
        }

        .two-columns {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
        }

        @media (max-width: 880px) {
            .two-columns {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .talk-item {
                grid-template-columns: 90px 1fr;
            }
            .talk-extra {
                display: none;
            }
            .hero h1 {
                font-size: 1.9rem;
            }
            .container {
                padding: 1.2rem;
            }
        }

        footer {
            text-align: center;
            margin-top: 3rem;
            padding: 2rem 1rem;
            border-top: 1px solid #2d3a5e;
            font-size: 0.85rem;
            color: #8192b0;
        }

        .button-link {
            background: #2563eb;
            border-radius: 30px;
            padding: 0.2rem 0.9rem;
            font-size: 0.7rem;
            font-weight: 500;
            color: white;
            text-decoration: none;
            white-space: nowrap;
        }

        .button-link:hover {
            background: #1d4ed8;
        }