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

/* ── Base Button ────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 13px var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: transform var(--transition-fast),
        box-shadow var(--transition-base),
        background var(--transition-base),
        opacity var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

.btn svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

/* ── Ripple Effect ──────────────────────────────── */
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.25) 0%, transparent 70%);
    opacity: 0;
    transform: scale(0);
    transition: transform 0.4s ease, opacity 0.4s ease;
    pointer-events: none;
}

.btn:active::after {
    opacity: 1;
    transform: scale(2.5);
    transition: none;
}

/* ── Primary (gradient) ─────────────────────────── */
.btn--primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: var(--shadow-button);
}

.btn--primary:hover:not(:disabled) {
    box-shadow: var(--shadow-button-hover);
}

/* ── Secondary (glass) ──────────────────────────── */
.btn--secondary {
    background: rgba(255, 255, 255, 0.07);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn--secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
}

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

.btn--ghost:hover:not(:disabled) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* ── Generate Button (inline with input) ──────── */
.btn--generate {
    flex-shrink: 0;
    padding: var(--space-md) 20px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: var(--shadow-button);
}

.btn--generate:hover:not(:disabled) {
    box-shadow: var(--shadow-button-hover);
}

.btn--generate svg {
    width: 16px;
    height: 16px;
    stroke-width: 2.5;
}

/* ── Icon-only Button ───────────────────────────── */
.btn--icon {
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.btn--icon:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
}

.btn--icon svg {
    width: 16px;
    height: 16px;
}

/* ── Action Button Group ────────────────────────── */
.actions {
    display: flex;
    gap: var(--space-md);
}

.actions .btn {
    flex: 1;
}

/* ── Loading Spinner inside button ──────────────── */
.btn .spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}