* { box-sizing: border-box; }
        :root {
            --istem-navy: #191c54;
            --istem-indigo: #2d2f83;
            --istem-purple: #7548d8;
            --istem-magenta: #ee2f8d;
            --istem-orange: #ffb02e;
            --istem-teal: #23c7c9;
            --text: #181a35;
            --muted: #667085;
            --line: rgba(82, 66, 139, .16);
            --shadow: 0 24px 70px rgba(25, 28, 84, .16);
        }
        body {
            font-family: Tahoma, Arial, sans-serif;
            margin: 0;
            min-height: 100vh;
            padding: 24px;
            color: var(--text);
            background:
                radial-gradient(circle at 8% 10%, rgba(255,176,46,.32), transparent 28%),
                radial-gradient(circle at 92% 7%, rgba(238,47,141,.25), transparent 30%),
                radial-gradient(circle at 70% 90%, rgba(35,199,201,.18), transparent 34%),
                linear-gradient(135deg, #fff 0%, #fff7fb 35%, #f3efff 70%, #eef9ff 100%);
            display: grid;
            place-items: center;
        }
        body::before {
            content: '';
            position: fixed;
            inset: 0;
            pointer-events: none;
            background-image:
                linear-gradient(rgba(45,47,131,.045) 1px, transparent 1px),
                linear-gradient(90deg, rgba(45,47,131,.045) 1px, transparent 1px);
            background-size: 42px 42px;
            mask-image: linear-gradient(180deg, rgba(0,0,0,.7), rgba(0,0,0,.12));
        }
        .container {
            position: relative;
            width: min(960px, 100%);
            display: grid;
            grid-template-columns: 1.05fr .95fr;
            overflow: hidden;
            background: rgba(255,255,255,.92);
            border: 1px solid var(--line);
            border-radius: 30px;
            box-shadow: var(--shadow);
            backdrop-filter: blur(18px);
        }
        .hero-panel {
            position: relative;
            overflow: hidden;
            min-height: 560px;
            padding: 34px;
            color: #fff;
            background:
                radial-gradient(circle at 82% 18%, rgba(255,176,46,.45), transparent 26%),
                radial-gradient(circle at 18% 92%, rgba(35,199,201,.22), transparent 30%),
                linear-gradient(135deg, rgba(25,28,84,.98), rgba(45,47,131,.97) 48%, rgba(238,47,141,.92));
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            gap: 28px;
        }
        .hero-panel::after {
            content: '';
            position: absolute;
            right: -74px;
            bottom: -88px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(255,255,255,.12);
            border: 1px solid rgba(255,255,255,.18);
        }
        .hero-content { position: relative; z-index: 1; }
        .event-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 12px;
            border-radius: 999px;
            background: rgba(255,255,255,.13);
            border: 1px solid rgba(255,255,255,.22);
            font-size: 12px;
            font-weight: 900;
            letter-spacing: .3px;
            text-transform: uppercase;
        }
        .hero-title {
            margin: 20px 0 10px;
            font-size: clamp(30px, 4vw, 48px);
            line-height: 1.08;
            letter-spacing: -1px;
            font-weight: 900;
        }
        .hero-sub {
            color: rgba(255,255,255,.86);
            line-height: 1.75;
            font-size: 15px;
            max-width: 470px;
        }
        .meta-grid {
            position: relative;
            z-index: 1;
            display: grid;
            gap: 10px;
        }
        .meta-card {
            padding: 13px 14px;
            border-radius: 18px;
            background: rgba(255,255,255,.12);
            border: 1px solid rgba(255,255,255,.18);
        }
        .meta-card strong { display: block; margin-bottom: 4px; }
        .meta-card span { color: rgba(255,255,255,.80); font-size: 13px; line-height: 1.5; }
        .form-panel {
            padding: 38px 34px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        h1 { margin: 0 0 8px; font-size: 28px; letter-spacing: -.4px; color: var(--istem-navy); }
        .subtitle { color: var(--muted); line-height: 1.65; margin-bottom: 22px; font-size: 15px; }
        input, button {
            width: 100%;
            padding: 14px 15px;
            margin-top: 10px;
            border-radius: 16px;
            border: 1px solid rgba(82,66,139,.22);
            font-size: 16px;
            font-family: inherit;
            outline: none;
        }
        input:focus { border-color: var(--istem-magenta); box-shadow: 0 0 0 4px rgba(238,47,141,.10); }
        .submit-btn {
            background: linear-gradient(135deg, var(--istem-orange), var(--istem-magenta));
            color: white;
            border: 0;
            font-weight: 900;
            cursor: pointer;
            margin-top: 14px;
            box-shadow: 0 14px 32px rgba(238,47,141,.25);
        }
        .submit-btn:hover, .admin-btn:hover { transform: translateY(-1px); opacity: .96; }
        .error { background: #fff1f0; color: #b42318; padding: 12px; border-radius: 14px; margin-bottom: 16px; font-weight: bold; text-align: center; border: 1px solid #ffd0cc; }
        .note { margin-top: 12px; color: var(--muted); font-size: 13px; line-height: 1.6; text-align: center; }
        .admin-link { margin-top: 22px; text-align: center; font-size: 13px; }
        .admin-link a { color: var(--istem-magenta); text-decoration: none; cursor: pointer; font-weight: 900; }
        .admin-box { display: none; margin-top: 20px; border-top: 1px solid var(--line); padding-top: 18px; }
        .admin-title { font-weight: 900; margin-bottom: 8px; text-align: center; color: var(--istem-navy); }
        .admin-btn { background: linear-gradient(135deg, var(--istem-navy), var(--istem-purple)); color: #fff; border: 0; font-weight: 900; cursor: pointer; }
        .small-link { display: inline-block; margin-top: 16px; color: var(--muted); text-decoration: none; font-size: 12px; }
        @media (max-width: 820px) {
            body { padding: 14px; place-items: start center; }
            .container { grid-template-columns: 1fr; border-radius: 24px; }
            .hero-panel { min-height: auto; padding: 26px; }
            .meta-grid { grid-template-columns: 1fr; }
            .form-panel { padding: 28px 22px; }
        }