#donation {
    --text: #111827;
    --surface: #ffffff;
    --muted: #6b7280;
    --border: #e5e7eb;
    --accent: #1a56db;
    --accent-hover: #1447c0;
    --preset-bg: #eef2fb;
    --preset-hover: #dde6f8;
    --preset-selected-bg: #1a56db;
    --preset-selected-text: #ffffff;
    --toggle-track: #e5e7eb;
    --disabled-bg: #d1d5db;
    --disabled-text: #9ca3af;
    --radius: 10px;
    --radius-sm: 7px;
}

@keyframes donationDialogFadeIn {
    from {
        scale: 0.95;
    }
    to {
        scale: 1;
    }
}

#donation {
    position: fixed;
    top: 50%;
    left: 50%;
    translate: -50% -50%;

    border: none;
    border-radius: 20px;
    padding: 2rem;
    background: var(--surface);
    box-shadow: none;
    max-width: 420px;

    animation: donationDialogFadeIn 0.2s ease-out;
}

#donation:focus {
    outline: none;
}

#donation::backdrop {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
}

/* Buttons */
#donation .btn-back, #donation .btn-close {
    position: absolute;
    outline: none;
    padding: 0;
    margin: 0;
    border: 0;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 0.5rem;
    background: transparent center no-repeat;
    cursor: pointer;
    z-index: 100;
}

/*#donation button.btn-back:focus, #donation button.btn-close:focus {*/
/*    background-color: rgba(50, 50, 50, 0.9);*/
/*}*/

#donation .btn-back {
    display: none;
    top: 0.5rem;
    left: 0.5rem;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 44 60" stroke-width="3" stroke="black" fill="transparent"><polyline points="30 10 10 30 30 50"/></svg>');
}

#donation .btn-back.visible {
    display: block;
}

#donation .btn-close {
    top: 0.5rem;
    right: 0.5rem;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 44 44" stroke-width="3" stroke="black" fill="transparent"><line x1="10" y1="10" x2="34" y2="34"/><line x1="10" y1="34" x2="34" y2="10"/></svg>');
}

#donation .panels {
    position: relative;
    overflow: hidden;
}

#donation .panel1, #donation .panel2 {
    width: 100%;
    transition: transform .45s cubic-bezier(.4, 0, .2, 1), opacity .35s ease;
}

#donation .panel1 {
    transform: translateX(0);
    opacity: 1;
}

#donation .panel1.slide {
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
}

#donation .panel2 {
    position: absolute;
    top: 0;
    left: 0;
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
}

#donation .panel2.visible {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

/* donation frequency */
#donation .frequency {
    background: var(--toggle-track);
    border-radius: 999px;
    padding: 3px;
    display: flex;
    margin-bottom: 24px;
}

#donation .frequency button {
    flex: 1;
    border: none;
    background: transparent;
    border-radius: 999px;
    padding: 8px 0;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    cursor: pointer;
    transition: background .18s, color .18s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

#donation .frequency button.active {
    background: var(--accent);
    color: #fff;
}

/* Amount label: one-time vs monthly */
#donation .amount-label {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 12px;
    text-align: center;
}

#donation .amount-label em {
    color: var(--text);
    font-weight: bold;
    padding: 0 0.2rem 0 0.2rem;
}

/* Preset grid */
#donation .preset-amounts {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 8px;
}

#donation .preset-amounts button {
    border: none;
    background: var(--preset-bg);
    border-radius: var(--radius-sm);
    padding: 12px 4px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: background .15s, color .15s, transform .1s;
}

#donation .preset-amounts button:hover {
    background: var(--preset-hover);
}

#donation .preset-amounts button.active {
    background: var(--preset-selected-bg);
    color: var(--preset-selected-text);
}

#donation .preset-amounts button:active {
    transform: scale(.96);
}

/* Custom amount */
#donation .custom-amount {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

#donation .currency {
    appearance: none;
    -webkit-appearance: none;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    padding: 0 28px 0 10px;
    height: 44px;
    cursor: pointer;
    transition: border-color .15s;
    width: 80px;
}

#donation .currency:focus {
    outline: none;
    border-color: var(--accent);
}

#donation .currency.active {
    background: var(--preset-selected-bg);
    color: var(--preset-selected-text);
    border-color: var(--preset-selected-bg);
}

#donation .custom-amount input {
    flex: 1;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    /*background: var(--bg);*/
    color: var(--text);
    padding: 0 14px;
    height: 44px;
    transition: border-color .15s, background .15s;
}

#donation .custom-amount input::placeholder {
    color: var(--muted);
}

#donation .custom-amount input:focus {
    outline: none;
    border-color: var(--accent);
    background: #fff;
}

#donation .comment {
    width: 100%;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    /*background: var(--bg);*/
    /*font-family: inherit;*/
    /*font-size: 14px;*/
    color: var(--text);
    padding: 10px 14px;
    resize: none;
    min-height: 72px;
    margin-bottom: 20px;
    transition: border-color .15s, background .15s;
}

#donation .comment::placeholder {
    color: var(--muted);
}

#donation .comment:focus {
    outline: none;
    border-color: var(--accent);
    background: #fff;
}

/* Button continue-to-panel2 */
#donation .btn-to-panel2 {
    width: 100%;
    border: none;
    border-radius: var(--radius);
    padding: 14px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background .18s, transform .1s;
}

#donation .btn-to-panel2:disabled {
    background: var(--disabled-bg);
    color: var(--disabled-text);
    cursor: not-allowed;
}

#donation .btn-to-panel2:not(:disabled) {
    background: var(--accent);
    color: #fff;
}

#donation .btn-to-panel2:not(:disabled):hover {
    background: var(--accent-hover);
}

#donation .btn-to-panel2:not(:disabled):active {
    transform: scale(.98);
}