/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.5;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Primary Button - Gradient */
.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
    color: var(--on-brand-primary);
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(var(--background-primary-rgb), 0.2);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(var(--background-primary-rgb), 0.2);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Outline Primary Button - matches the "Koop credits" header button style */
.btn-outline-primary {
    background: transparent;
    color: var(--brand-primary-dark);
    border: 1.5px solid var(--brand-primary);
    border-radius: var(--radius-full);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--brand-primary);
    color: var(--on-brand-primary);
    border-color: var(--brand-primary);
}

.btn-outline-primary svg,
.btn-outline-primary .lucide {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Secondary Button */
.btn-secondary {
    background: var(--brand-secondary);
    color: var(--background-primary);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--brand-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-light);
}

.btn-ghost:hover:not(:disabled) {
    border-color: var(--brand-primary);
    color: var(--brand-primary-dark);
    background: rgba(var(--brand-primary-rgb), 0.05);
}

/* Small Button */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
}

/* Large Button */
.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: 1.0625rem;
}

/* Icon-only Button */
.btn-icon {
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--background-secondary);
    color: var(--text-primary);
}

/* Lucide icons inside buttons */
.btn [data-lucide].btn-icon,
.btn i.btn-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* ========================================
   FORM ELEMENTS
   ======================================== */

.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input,
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--background-primary);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 4px rgba(var(--brand-primary-rgb), 0.15);
}

.form-input::placeholder,
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

/* ========================================
   CARDS
   ======================================== */

.card {
    background: var(--background-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.card-elevated {
    box-shadow: var(--shadow-lg);
}

.card-bordered {
    box-shadow: none;
    border: 1px solid var(--border-light);
}