/* BookMart - Exchange Page Styles */
.exchange-page { padding: var(--spacing-2xl) 0; }
.exchange-intro { text-align: center; max-width: 700px; margin: 0 auto var(--spacing-xl); }
.exchange-intro h2 { margin-bottom: var(--spacing-sm); }
.exchange-intro p { line-height: 1.8; }
.how-it-works { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-lg); margin-bottom: var(--spacing-2xl); }
.step { text-align: center; padding: var(--spacing-lg); position: relative; }
.step-number { width: 50px; height: 50px; background: var(--accent); color: var(--text-white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 700; margin: 0 auto var(--spacing-md); }
.step h3 { margin-bottom: var(--spacing-sm); }
.step p { font-size: 0.9rem; }
.exchange-form-section { background: var(--bg-secondary); padding: var(--spacing-2xl) 0; }
.exchange-form { max-width: 600px; margin: 0 auto; background: var(--bg-primary); padding: var(--spacing-xl); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.exchange-form h3 { margin-bottom: var(--spacing-lg); text-align: center; }
.upload-area { border: 2px dashed var(--border); border-radius: var(--radius-md); padding: 40px; text-align: center; cursor: pointer; transition: var(--transition); }
.upload-area:hover { border-color: var(--accent); background: var(--bg-accent); }
.upload-area .icon { font-size: 2.5rem; margin-bottom: var(--spacing-md); }
.upload-area p { font-size: 0.9rem; }
/* Exchange Benefits */
.exchange-benefits {
    padding: var(--spacing-2xl) 0;
}

.exchange-benefits .benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.exchange-benefits .benefit-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.exchange-benefits .benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.exchange-benefits .benefit-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.exchange-benefits .benefit-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.exchange-benefits .benefit-card p {
    font-size: 0.9rem;
}

/* Error & Success Messages */
.error-message {
    display: block;
    color: var(--accent);
    font-size: 0.8rem;
    margin-top: 4px;
    min-height: 1.2em;
}

.has-error input,
.has-error select {
    border-color: var(--accent) !important;
    background: rgba(232, 93, 117, 0.10);
}

.success-message {
    background: rgba(47, 191, 113, 0.14);
    color: var(--color-success);
    border: 1px solid rgba(47, 191, 113, 0.35);
    padding: 15px 20px;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    text-align: center;
    font-weight: 600;
}

.exchange-submit {
    width: 100%;
}

.exchange-form-desc {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.upload-hint {
    font-size: 0.8rem;
    color: var(--text-light);
}

@media (max-width: 768px) {
    .how-it-works { grid-template-columns: repeat(2, 1fr); }
    .exchange-benefits .benefits-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .how-it-works { grid-template-columns: 1fr; }
}