.df-donation-form-wrapper {
    --df-primary: #2563eb;
    --df-primary-hover: #1d4ed8;
    --df-border: #d1d5db;
    --df-text: #111827;
    --df-muted: #6b7280;
    --df-error: #dc2626;
    --df-bg: #ffffff;
    --df-radius: 12px;
    --df-shadow: 0 10px 30px rgba(17, 24, 39, 0.08);
    box-sizing: border-box;
    max-width: 720px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.df-donation-form-wrapper *,
.df-donation-form-wrapper *::before,
.df-donation-form-wrapper *::after {
    box-sizing: border-box;
}

.df-donation-form {
    background: var(--df-bg);
    border: 1px solid var(--df-border);
    border-radius: var(--df-radius);
    box-shadow: var(--df-shadow);
    padding: 24px;
}

.df-form-lang {
    display: inline-flex;
    gap: 4px;
    margin-bottom: 16px;
    padding: 4px;
    border: 1px solid var(--df-border);
    border-radius: 999px;
    background: #f9fafb;
}

.df-lang-btn {
    appearance: none;
    border: none;
    border-radius: 999px;
    background: transparent;
    color: var(--df-muted);
    cursor: pointer;
    font-size: 13px;
    font-weight: 700;
    line-height: 1;
    min-width: 44px;
    padding: 8px 12px;
    transition: background 0.2s ease, color 0.2s ease;
}

.df-lang-btn.is-active {
    background: var(--df-primary);
    color: #fff;
}

.df-form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.df-form-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.df-form-field--full {
    grid-column: 1 / -1;
}

.df-form-field--inline {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 16px;
}

.df-form-field label {
    font-size: 14px;
    font-weight: 600;
    color: var(--df-text);
}

.df-form-field input,
.df-form-field select {
    width: 100%;
    border: 1px solid var(--df-border);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 15px;
    color: var(--df-text);
    background: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.df-form-field input:focus,
.df-form-field select:focus {
    outline: none;
    border-color: var(--df-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.df-form-section {
    margin-top: 4px;
    padding-top: 16px;
    border-top: 1px solid var(--df-border);
}

.df-form-section__title {
    margin: 0 0 12px;
    font-size: 16px;
    font-weight: 700;
    color: var(--df-text);
}

.df-donation-row {
    display: grid;
    grid-template-columns: minmax(140px, 1fr);
    gap: 16px;
}

.df-amount-picker {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.df-amount-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(72px, 1fr));
    gap: 0;
    border: 1px solid var(--df-border);
    border-radius: 8px;
    overflow: hidden;
    background: #fff;
}

.df-amount-btn {
    appearance: none;
    border: none;
    border-right: 1px solid var(--df-border);
    background: #fff;
    color: var(--df-muted);
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.2;
    min-height: 48px;
    padding: 10px 8px;
    transition: background 0.2s ease, color 0.2s ease;
}

.df-amount-btn:last-child {
    border-right: none;
}

.df-amount-btn.is-active {
    background: var(--df-primary);
    color: #fff;
}

.df-amount-btn.is-active .df-amount-suffix {
    color: rgba(255, 255, 255, 0.92);
}

.df-amount-suffix {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-top: 2px;
}

.df-amount-input.is-hidden {
    display: none;
}

.df-currency-badge {
    display: inline-flex;
    align-items: center;
    min-height: 46px;
    padding: 10px 14px;
    border: 1px solid var(--df-border);
    border-radius: 8px;
    background: #f9fafb;
    font-size: 15px;
    font-weight: 600;
    color: var(--df-text);
}

.df-field-error {
    color: var(--df-error);
    font-size: 12px;
}

.df-form-alert {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.df-form-alert--error {
    background: #fef2f2;
    color: var(--df-error);
    border: 1px solid #fecaca;
}

.df-form-actions {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
}

.df-btn {
    border: none;
    border-radius: 999px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

.df-btn--primary {
    background: var(--df-primary);
    color: #fff;
}

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

@media (max-width: 640px) {
    .df-form-grid,
    .df-form-field--inline,
    .df-donation-row {
        grid-template-columns: 1fr;
    }

    .df-donation-form {
        padding: 16px;
    }
}