/* ─── StemLab Donate v2.1.0 ───
   Rebuilt on stemlab-core design tokens + premium enhancements. */

/* ─── Keyframes ─── */
@keyframes sldon-btn-glow {
    0%, 100% { box-shadow: 0 0 16px rgba(240, 23, 111, 0.20); }
    50%       { box-shadow: 0 0 28px rgba(240, 23, 111, 0.35); }
}

@keyframes sldon-selected-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(240, 23, 111, 0.0),
                           0 0 20px rgba(240, 23, 111, 0.20); }
    50%       { box-shadow: 0 0 0 3px rgba(240, 23, 111, 0.10),
                           0 0 32px rgba(240, 23, 111, 0.30); }
}

/* ─── Panel ─── */
.sldon-panel {
    max-width: 560px;
    margin: var(--space-10) auto;
    padding: 0 var(--space-5);
    font-family: var(--font-sans);
}

/* ─── Hero Section ─── */
.sldon-hero {
    text-align: center;
    margin-bottom: var(--space-8);
}

.sldon-title {
    font-size: var(--text-h3);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-3) 0;
}

.sldon-pink {
    color: var(--color-accent);
    text-shadow: 0 0 20px rgba(240, 23, 111, 0.25);
}

.sldon-subtitle {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin: 0;
    max-width: 440px;
    margin-left: auto;
    margin-right: auto;
}

/* ─── Amount Buttons Grid ─── */
.sldon-amounts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

/* ─── Amount Buttons: premium toggle styling ─── */
.sldon-amount-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-3);
    font-size: var(--text-body);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    transition: border-color 150ms var(--ease-standard),
                background 150ms var(--ease-standard),
                box-shadow 150ms var(--ease-standard),
                color 150ms var(--ease-standard),
                transform 150ms var(--ease-standard);
    text-align: center;
    font-family: var(--font-sans);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25),
                inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* Sheen overlay */
.sldon-amount-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
    border-radius: inherit;
    pointer-events: none;
    opacity: 0;
    transition: opacity 150ms var(--ease-standard);
}

.sldon-amount-btn:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-tint);
    box-shadow: 0 0 20px rgba(240, 23, 111, 0.20),
                0 4px 16px rgba(0, 0, 0, 0.3),
                inset 0 1px 0 rgba(255, 255, 255, 0.06);
    color: var(--color-accent);
    text-decoration: none;
    transform: translateY(-2px);
}

.sldon-amount-btn:hover::before {
    opacity: 1;
}

.sldon-amount-btn:active {
    transform: translateY(0) scale(0.97);
}

/* ─── Selected/Active state (set via JS) ─── */
.sldon-amount-btn.sldon-selected,
.sldon-amount-btn[aria-pressed="true"],
.sldon-amount-btn:focus-visible {
    border-color: var(--color-accent);
    background: var(--color-accent-tint);
    color: var(--color-accent);
    animation: sldon-selected-pulse 2s ease-in-out infinite;
    outline: none;
}

/* ─── Custom amount button: distinct style ─── */
.sldon-amount-custom {
    grid-column: span 1;
    font-size: var(--text-caption);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-normal);
    border-style: dashed;
    color: var(--color-text-subdued);
}

.sldon-amount-custom:hover {
    border-style: solid;
    color: var(--color-accent);
}

/* ─── Custom amount input (inline mode) ─── */
.sldon-custom-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.sldon-custom-prefix {
    position: absolute;
    left: var(--space-4);
    color: var(--color-accent);
    font-weight: var(--weight-bold);
    font-size: var(--text-body);
    pointer-events: none;
    z-index: 1;
}

.sldon-custom-input {
    width: 100%;
    background: rgba(10, 10, 18, 0.9);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    padding: var(--space-4) var(--space-4) var(--space-4) var(--space-7);
    font-size: var(--text-body);
    font-weight: var(--weight-bold);
    font-family: var(--font-sans);
    transition: border-color 150ms var(--ease-standard),
                box-shadow 150ms var(--ease-standard);
    outline: none;
    text-align: center;
}

.sldon-custom-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(240, 23, 111, 0.18),
                0 0 20px rgba(240, 23, 111, 0.10);
}

.sldon-custom-input::placeholder {
    color: var(--color-text-disabled);
    font-weight: var(--weight-regular);
}

/* ─── Disabled state ─── */
.sldon-amount-disabled {
    opacity: 0.35;
    cursor: default;
    pointer-events: none;
    filter: grayscale(0.5);
}

/* ─── Note ─── */
.sldon-note {
    font-size: var(--text-overline);
    color: var(--color-text-subdued);
    text-align: center;
    margin: 0 0 var(--space-10) 0;
    letter-spacing: 0.04em;
}

/* ─── FAQ Section: frosted glass card ─── */
.sldon-faq {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--card-padding);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25),
                inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

/* Top highlight */
.sldon-faq::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent);
    pointer-events: none;
}

.sldon-faq-title {
    font-size: var(--text-body-sm);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-5) 0;
    letter-spacing: 0.01em;
}

.sldon-faq-item {
    margin-bottom: var(--space-4);
}

.sldon-faq-item:last-child {
    margin-bottom: 0;
}

.sldon-faq-q {
    font-size: var(--text-caption);
    font-weight: var(--weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.sldon-faq-a {
    font-size: var(--text-caption);
    color: var(--color-text-subdued);
    line-height: var(--leading-relaxed);
}

/* ─── Responsive ─── */
@media (max-width: 480px) {
    .sldon-panel {
        padding: 0 var(--space-3);
        margin: var(--space-6) auto;
    }

    .sldon-amounts {
        grid-template-columns: repeat(2, 1fr);
    }

    .sldon-amount-custom {
        grid-column: span 2;
    }
}

/* 5-column layout for larger screens */
@media (min-width: 481px) {
    .sldon-amounts {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* ─── Reduced motion ─── */
@media (prefers-reduced-motion: reduce) {
    .sldon-amount-btn,
    .sldon-custom-input {
        transition-duration: 0.01ms;
    }

    .sldon-amount-btn.sldon-selected,
    .sldon-amount-btn[aria-pressed="true"] {
        animation: none;
        box-shadow: 0 0 16px rgba(240, 23, 111, 0.20);
    }
}