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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 560px;
    position: relative;
    z-index: 1;
}

.card {
    background: #fff;
    border-radius: 16px;
    padding: 40px 36px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    font-size: 28px;
    color: #1a1a2e;
    margin-bottom: 4px;
}

.subtitle {
    color: #666;
    margin-bottom: 28px;
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 6px;
    font-size: 14px;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: #fafafa;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: #302b63;
    box-shadow: 0 0 0 3px rgba(48, 43, 99, 0.15);
    background: #fff;
}

textarea {
    resize: vertical;
    min-height: 120px;
}

button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #302b63, #24243e);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    margin-top: 4px;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(48, 43, 99, 0.4);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.alert {
    padding: 14px 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-size: 14px;
    line-height: 1.5;
}

.alert.success {
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #a5d6a7;
}

.alert.error {
    background: #fce4ec;
    color: #c62828;
    border: 1px solid #ef9a9a;
}

.btn-spinner {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#loading-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(15, 12, 41, 0.88);
    z-index: 99999;
    display: none;
    align-items: center;
    justify-content: center;
    text-align: center;
}

#loading-overlay.visible {
    display: flex;
}

#loading-overlay::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 64px;
    height: 64px;
    margin: -32px 0 0 -32px;
    border: 5px solid rgba(255, 255, 255, 0.15);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

#loading-overlay::after {
    content: 'Odesílám váš dotaz...\AProsím počkejte, odesílám emaily.';
    white-space: pre;
    position: relative;
    top: 80px;
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.6;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

@media (max-width: 480px) {
    .card {
        padding: 28px 20px;
    }

    h1 {
        font-size: 22px;
    }
}