:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --success-bg: #d1fae5;
    --error-color: #ef4444;
    --error-bg: #fee2e2;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.widget-container {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 420px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 32px;
    transition: all 0.3s ease;
}

.widget-header {
    text-align: center;
    margin-bottom: 28px;
}

.widget-header h2 {
    color: var(--text-main);
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.widget-header p {
    color: var(--text-muted);
    font-size: 14px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-main);
    font-size: 14px;
    font-weight: 600;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    color: var(--text-main);
    background-color: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.form-group input::placeholder {
    color: #94a3b8;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    background-color: #93c5fd;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    width: 100%;
    background-color: #f1f5f9;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 20px;
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

/* Result Card */
.result-card {
    text-align: center;
    animation: fadeIn 0.4s ease forwards;
}

.result-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.result-icon.success {
    background-color: var(--success-bg);
    color: var(--success-color);
}

.result-icon.error {
    background-color: var(--error-bg);
    color: var(--error-color);
}

.result-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-main);
}

.result-card p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.5;
}

/* Loader */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive iframe friendly */
@media (max-width: 480px) {
    .widget-container {
        padding: 24px 20px;
        box-shadow: none;
        border-radius: 0;
    }
    body {
        padding: 0;
        background-color: var(--card-bg);
    }
}