:root {
    --primary: #2563eb;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: #334155;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    color: var(--primary);
    text-align: center;
    margin-bottom: 8px;
}

.container {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    max-width: 900px;
    width: 100%;
}

.container > p.subtitle {
    text-align: center;
    margin: 0;
    color: #64748b;
}

.config-form {
    margin-top: 20px;
    margin-bottom: 24px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}

.config-form .form-group {
    margin-bottom: 16px;
}

.config-form label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #475569;
}

.config-form input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
}

.config-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.config-form button[type="submit"] {
    margin-top: 8px;
    padding: 12px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
}

.config-form button[type="submit"]:hover {
    background: #1d4ed8;
}

.config-form button[type="submit"]:disabled {
    background: #94a3b8;
    cursor: not-allowed;
}

.config-saved {
    color: #059669;
    font-weight: 500;
    margin-top: 10px;
    padding: 12px;
    background: #f0fdf4;
    border-radius: 8px;
}

.config-saved.hidden {
    display: none;
}

.iframe-wrap {
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #e2e8f0;
    min-height: 500px;
}

.iframe-wrap iframe {
    display: block;
    width: 100%;
    min-height: 500px;
    border: none;
}

.loading {
    padding: 40px;
    text-align: center;
    color: #64748b;
}

.error {
    color: #dc2626;
    font-weight: 500;
    margin-top: 10px;
    padding: 12px;
    background: #fef2f2;
    border-radius: 8px;
}

.error.hidden,
.loading.hidden,
.balance-display.hidden {
    display: none;
}

.balance-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.balance-display {
    margin-top: 24px;
    text-align: center;
    width: 100%;
}

.balance-number {
    display: block;
    font-size: clamp(3rem, 15vw, 8rem);
    font-weight: 700;
    color: var(--primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.balance-item {
    padding: 12px;
    margin-bottom: 8px;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.balance-json {
    margin: 0;
    padding: 16px;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    overflow-x: auto;
    font-size: 0.9rem;
}