/* ══════════════════════════════════════
   Buttons Component
   ══════════════════════════════════════ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 600;
    font-family: inherit;
    line-height: 1;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
}

.btn:active {
    transform: scale(0.97);
}

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

/* ── Ripple Effect ── */
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 10%);
    background-repeat: no-repeat;
    background-position: center;
    transform: scale(10);
    opacity: 0;
    transition: transform 0.5s, opacity 0.5s;
}

.btn:active::after {
    transform: scale(0);
    opacity: 1;
    transition: 0s;
}

/* ── Primary Button ── */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: var(--text-on-primary);
    box-shadow: var(--shadow-sm), 0 2px 8px rgba(29, 107, 75, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-400), var(--primary-500));
    box-shadow: var(--shadow-md), 0 4px 16px rgba(29, 107, 75, 0.3);
    transform: translateY(-1px);
}

/* ── Secondary Button ── */
.btn-secondary {
    background: var(--bg-card);
    color: var(--primary-600);
    border-color: var(--primary-300);
}

.btn-secondary:hover {
    background: var(--primary-50);
    border-color: var(--primary-400);
    transform: translateY(-1px);
}

/* ── Accent Button ── */
.btn-accent {
    background: linear-gradient(135deg, var(--accent-400), var(--accent-500));
    color: var(--primary-900);
    box-shadow: var(--shadow-sm), var(--shadow-gold);
}

.btn-accent:hover {
    background: linear-gradient(135deg, var(--accent-300), var(--accent-400));
    box-shadow: var(--shadow-md), 0 4px 16px rgba(212, 165, 32, 0.3);
    transform: translateY(-1px);
}

/* ── Ghost Button ── */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ── Danger Button ── */
.btn-danger {
    background: linear-gradient(135deg, var(--error), hsl(0, 72%, 45%));
    color: #ffffff;
}

.btn-danger:hover {
    box-shadow: 0 4px 16px rgba(220, 38, 38, 0.3);
    transform: translateY(-1px);
}

/* ── Sizes ── */
.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
    border-radius: var(--radius-md);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    border-radius: var(--radius-xl);
}

.btn-xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
    border-radius: var(--radius-xl);
}

/* ── Full Width ── */
.btn-full {
    width: 100%;
}

/* ── Icon Button ── */
.btn-icon {
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    aspect-ratio: 1;
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* ── Loading State ── */
.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::before {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}