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

:root {
    --black: #111;
    --gray-900: #1a1a1a;
    --gray-700: #4a4a4a;
    --gray-500: #8a8a8a;
    --gray-300: #d4d4d4;
    --gray-200: #eaeaea;
    --gray-100: #f5f5f5;
    --white: #fff;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--white);
    color: var(--black);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--black);
    text-decoration: underline;
}

a:hover {
    text-decoration: none;
}

.site-header {
    border-bottom: 1px solid var(--black);
    padding: 20px 24px;
    background: var(--white);
}

.site-header .logo {
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 18px;
}

.hero {
    background: var(--black);
    color: var(--white);
    padding: 72px 24px;
    text-align: center;
}

.hero h1 {
    font-size: clamp(32px, 5vw, 48px);
    margin: 0 0 16px;
    letter-spacing: -0.5px;
}

.hero p {
    max-width: 640px;
    margin: 0 auto;
    color: var(--gray-300);
    font-size: 18px;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 48px 24px 72px;
}

.donation-card {
    border: 2px solid var(--black);
    background: var(--white);
    padding: 32px;
}

.donation-card h2 {
    margin: 0 0 8px;
    font-size: 24px;
    letter-spacing: -0.3px;
}

.donation-card .lead {
    margin: 0 0 24px;
    color: var(--gray-700);
}

.field {
    margin-bottom: 20px;
}

.field > label,
.field-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.amounts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

@media (max-width: 520px) {
    .amounts { grid-template-columns: repeat(2, 1fr); }
}

.amount-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.amount-option label {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 56px;
    border: 2px solid var(--black);
    background: var(--white);
    color: var(--black);
    font-weight: 700;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease;
    user-select: none;
}

.amount-option label:hover {
    background: var(--gray-100);
}

.amount-option input[type="radio"]:checked + label {
    background: var(--black);
    color: var(--white);
}

.amount-option input[type="radio"]:focus-visible + label {
    outline: 3px solid var(--gray-500);
    outline-offset: 2px;
}

.custom-amount-wrapper {
    margin-top: 12px;
    display: none;
}

.custom-amount-wrapper.is-visible {
    display: block;
}

.input-with-suffix {
    display: flex;
    align-items: stretch;
    border: 2px solid var(--black);
    background: var(--white);
}

.input-with-suffix input {
    flex: 1;
    border: none;
    padding: 12px 14px;
    font-size: 16px;
    background: transparent;
    outline: none;
}

.input-with-suffix .suffix {
    background: var(--black);
    color: var(--white);
    padding: 0 16px;
    display: flex;
    align-items: center;
    font-weight: 700;
}

.field input[type="text"],
.field input[type="email"] {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--black);
    background: var(--white);
    font-size: 16px;
    color: var(--black);
    outline: none;
}

.field input[type="text"]:focus,
.field input[type="email"]:focus,
.input-with-suffix:focus-within {
    box-shadow: inset 0 0 0 2px var(--black);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 520px) {
    .grid-2 { grid-template-columns: 1fr; gap: 0; }
}

.consent {
    border-top: 1px solid var(--gray-300);
    padding-top: 20px;
    margin-top: 24px;
}

.consent .admin-info {
    font-size: 12px;
    color: var(--gray-700);
    margin: 0 0 16px;
    line-height: 1.5;
}

.checkbox {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    color: var(--gray-900);
    cursor: pointer;
    line-height: 1.5;
}

.checkbox input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: 2px solid var(--black);
    background: var(--white);
    display: inline-block;
    margin-top: 1px;
    cursor: pointer;
    position: relative;
}

.checkbox input[type="checkbox"]:checked {
    background: var(--black);
}

.checkbox input[type="checkbox"]:checked::after {
    content: "";
    position: absolute;
    left: 4px;
    top: 0px;
    width: 6px;
    height: 12px;
    border: solid var(--white);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.submit {
    width: 100%;
    padding: 18px 24px;
    margin-top: 24px;
    background: var(--black);
    color: var(--white);
    border: 2px solid var(--black);
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease;
}

.submit:hover {
    background: var(--white);
    color: var(--black);
}

.submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.error-text {
    display: none;
    color: var(--black);
    font-size: 12px;
    margin-top: 6px;
    padding: 6px 8px;
    background: var(--gray-100);
    border-left: 3px solid var(--black);
}

.field.has-error .error-text {
    display: block;
}

.field.has-error input[type="text"],
.field.has-error input[type="email"],
.field.has-error .input-with-suffix {
    box-shadow: inset 0 0 0 2px var(--black);
    background: var(--gray-100);
}

.site-footer {
    border-top: 1px solid var(--black);
    padding: 24px;
    text-align: center;
    color: var(--gray-700);
    font-size: 13px;
}

.flash {
    border: 2px solid var(--black);
    padding: 14px 16px;
    margin-bottom: 24px;
    background: var(--gray-100);
    font-size: 14px;
}

.flash.flash-error {
    background: var(--black);
    color: var(--white);
}

.flash.flash-success {
    background: var(--white);
    color: var(--black);
}

.status-page {
    max-width: 640px;
    margin: 0 auto;
    padding: 72px 24px;
    text-align: center;
}

.status-page h1 {
    font-size: clamp(28px, 5vw, 40px);
    margin: 0 0 16px;
}

.status-page .status-badge {
    display: inline-block;
    background: var(--black);
    color: var(--white);
    padding: 8px 18px;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 24px;
}

.status-page .btn-back {
    display: inline-block;
    margin-top: 32px;
    padding: 14px 28px;
    border: 2px solid var(--black);
    color: var(--black);
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.status-page .btn-back:hover {
    background: var(--black);
    color: var(--white);
}