:root {
    --primary: #25D366; /* WhatsApp Green */
    --primary-dark: #128C7E;
    --dark: #1e1e1e;
    --gray: #888888;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --bg-color: #0f172a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 50% -20%, #1e293b, #0f172a);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--white);
    padding: 20px;
}

.whatsapp-container {
    width: 100%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.brand-header {
    text-align: center;
}

.brand-header .logo {
    max-width: 180px;
    height: auto;
}

.form-card, .success-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
    text-align: center;
}

.form-card h1 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    font-weight: 800;
}

.form-card p {
    color: #cbd5e1;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 30px;
}

.input-group {
    text-align: left;
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #e2e8f0;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
    color: var(--white);
    font-size: 1rem;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background-color: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    margin-top: 10px;
}

.btn-submit:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-submit:disabled {
    background-color: var(--gray);
    cursor: not-allowed;
    transform: none;
}

.error-msg {
    color: #ef4444 !important;
    font-weight: 600;
    margin-bottom: 20px !important;
    display: none;
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
    font-size: 0.8rem;
    color: #94a3b8;
}

.success-card h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--primary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    margin: 30px auto 0;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 480px) {
    .form-card {
        padding: 30px 20px;
    }
}