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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #e2e8f0;
    background: #0f172a;
}

/* HEADER */
header {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #334155;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: #60a5fa;
    letter-spacing: -1px;
}

nav a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 2.2rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

nav a:hover {
    color: #60a5fa;
    transform: translateY(-2px);
}

/* HERO */
.hero {
    min-height: 100vh;
    background: linear-gradient(rgba(15, 23, 42, 0.75), rgba(15, 23, 42, 0.85)), 
                url('https://images.unsplash.com/photo-1488521787991-ed7bbaae773c?ixlib=rb-4.0.3&auto=format&fit=crop&q=80') center/cover no-repeat;
    display: flex;
    align-items: center;
    text-align: center;
    padding-top: 90px;
}

.hero-content {
    max-width: 850px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: white;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.35rem;
    margin-bottom: 2.8rem;
    color: #cbd5e1;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    color: white;
    padding: 18px 48px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 600;
    box-shadow: 0 15px 30px rgba(59, 130, 246, 0.35);
    transition: all 0.4s ease;
}

.btn-primary:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 35px rgba(59, 130, 246, 0.45);
}

/* FORMULARIO */
.registro {
    padding: 120px 20px 100px;
    background: #1e2937;
}

.registro-box {
    max-width: 720px;
    margin: 0 auto;
    background: #0f172a;
    padding: 55px 50px;
    border-radius: 20px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border: 1px solid #334155;
}

.form-header h2 {
    text-align: center;
    font-size: 2.2rem;
    color: #60a5fa;
    margin-bottom: 8px;
}

.form-description {
    text-align: center;
    color: #94a3b8;
    margin-bottom: 40px;
    font-size: 1.05rem;
}

.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: #cbd5e1;
    font-weight: 600;
    font-size: 0.98rem;
}

/* Estilo para inputs, textarea y SELECT (Países) */
.input-group input,
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 16px 18px;
    background: #1e2937;
    border: 1.5px solid #475569;
    border-radius: 12px;
    color: #e2e8f0;
    font-size: 1.05rem;
    transition: all 0.3s ease;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    border-color: #60a5fa;
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.15);
    outline: none;
}

/* Estilo específico para el select de países */
.input-group select {
    cursor: pointer;
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="%23cbd5e1" viewBox="0 0 16 16"><path d="M7 10l-5-5 1.5-1.5L7 7l5.5-5.5L14 5z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 18px center;
}

/* Botón Enviar */
.btn-enviar {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.4s ease;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

.btn-enviar:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px rgba(59, 130, 246, 0.4);
}

/* CONTACTO */
.contacto {
    padding: 100px 20px;
    background: #0f172a;
    text-align: center;
}

.contacto h2 {
    color: #60a5fa;
    margin-bottom: 35px;
    font-size: 2.2rem;
}

.contact-info p {
    font-size: 1.15rem;
    margin: 15px 0;
    color: #cbd5e1;
}

/* FOOTER */
footer {
    background: #020617;
    padding: 50px 20px 30px;
    text-align: center;
    border-top: 1px solid #334155;
}

.footer-small {
    margin-top: 12px;
    color: #64748b;
    font-size: 0.95rem;
}