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

        :root {
            --primary-navy: #1e3d6f;
            --primary-blue: #2c5aa0;
            --primary-cyan: #06b6d4;
            --accent-cyan: #4fc3f7;
            --accent-orange: #f39c12;
            --accent-green: #10b981;
            --text-dark: #2d2d2d;
            --text-light: #555;
            --background-light: #f8f9fa;
            --background-white: #ffffff;
            --border-light: #e5e7eb;
            --shadow-sm: 0 2px 10px rgba(0,0,0,0.1);
            --shadow-md: 0 5px 15px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
        }
        [data-theme="dark"] {
            --primary-navy: #4fc3f7;
            --primary-blue: #3b82f6;
            --primary-cyan: #22d3ee;
            --text-dark: #f0f0f0;
            --text-light: #d0d0d0;
            --background-light: #1a1a1a;
            --background-white: #2d2d2d;
            --border-light: #374151;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background: var(--background-white);
        }

        .container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

        /* ===== HERO ===== */
        .hero {
            background: linear-gradient(135deg, var(--primary-navy), var(--primary-blue));
            color: white;
            padding: 3rem 0 2.5rem;
            text-align: center;
        }
        .hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; margin-bottom: 0.75rem; }
        .hero p { opacity: 0.92; max-width: 720px; margin: 0 auto; font-size: clamp(1rem, 2vw, 1.15rem); }

        /* ===== SPEAKER LIST ===== */
        .speakers-list {
            padding: 3.5rem 0;
            display: flex;
            flex-direction: column;
            gap: 2.25rem;
        }

        .speaker-card {
            background: var(--background-white);
            border: 1px solid var(--border-light);
            border-radius: 18px;
            padding: 2rem;
            box-shadow: var(--shadow-sm);
            display: grid;
            grid-template-columns: 180px 1fr;
            gap: 2rem;
            align-items: start;
            transition: box-shadow 0.2s;
        }

        .speaker-card:hover { box-shadow: var(--shadow-md); }

        .speaker-photo {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-navy), var(--primary-blue));
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.6rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .speaker-photo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 50%;
        }

        .speaker-body { display: flex; flex-direction: column; gap: 0.6rem; }

        .speaker-badge {
            display: inline-block;
            background: var(--accent-orange);
            color: white;
            font-size: 0.7rem;
            padding: 0.3rem 0.85rem;
            border-radius: 999px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.4px;
            align-self: flex-start;
        }

        .speaker-badge.keynote { background: var(--primary-blue); }
        .speaker-badge.host { background: var(--accent-green); }

        .speaker-name {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--primary-navy);
            line-height: 1.2;
        }
        [data-theme="dark"] .speaker-name { color: var(--primary-cyan); }

        .speaker-title {
            color: var(--primary-blue);
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 0.4rem;
        }

        .speaker-bio {
            color: var(--text-dark);
            font-size: 0.95rem;
            line-height: 1.65;
        }

        .speaker-bio + .speaker-bio { margin-top: 0.6rem; }

        .speaker-bio.placeholder { font-style: italic; color: var(--text-light); }

        .speaker-quote {
            font-style: italic;
            color: var(--text-light);
            border-left: 3px solid var(--accent-cyan);
            padding-left: 1rem;
            margin-top: 0.7rem;
        }

        .speaker-events {
            margin-top: 1rem;
            padding-top: 0.85rem;
            border-top: 1px solid var(--border-light);
            font-size: 0.85rem;
            color: var(--text-light);
        }

        .speaker-events strong { color: var(--text-dark); font-weight: 600; }

        @media (max-width: 700px) {
            .speaker-card { grid-template-columns: 1fr; text-align: center; padding: 1.5rem; }
            .speaker-photo { margin: 0 auto; width: 140px; height: 140px; font-size: 2rem; }
            .speaker-events { text-align: left; }
            .speaker-quote { text-align: left; }
        }

        /* ===== CTA ===== */
        .submit-cta {
            background: var(--primary-navy);
            color: white;
            padding: 2.5rem 2rem;
            border-radius: 20px;
            text-align: center;
            margin: 1rem auto 3rem;
            max-width: 1100px;
        }
        .submit-cta h2 { font-size: clamp(1.3rem, 3vw, 1.8rem); margin-bottom: 0.6rem; color: white; }
        .submit-cta p { opacity: 0.9; margin-bottom: 1.25rem; }
        .submit-cta a.btn {
            display: inline-block;
            background: var(--accent-orange);
            color: white;
            padding: 0.85rem 2rem;
            border-radius: 999px;
            text-decoration: none;
            font-weight: 700;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .submit-cta a.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.25); }

        /* ===== FOOTER ===== */
        .footer { background: var(--primary-navy); color: white; padding: 3rem 0 1rem; margin-top: 3rem; }
        .footer-content { max-width: 1200px; margin: 0 auto; padding: 0 2rem; display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }
        .footer-section h3, .footer-section h4 { color: var(--accent-cyan); margin-bottom: 1rem; }
        .footer-section ul { list-style: none; }
        .footer-section ul li { margin-bottom: 0.5rem; }
        .footer-section a { color: white; text-decoration: none; opacity: 0.85; }
        .footer-section a:hover { opacity: 1; }
        .footer-bottom { text-align: center; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid rgba(255,255,255,0.2); opacity: 0.8; font-size: 0.9rem; }

        @media (max-width: 800px) { .footer-content { grid-template-columns: 1fr; text-align: center; } }