.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    border: 1px solid transparent;
}

.btn:disabled,
.btn-icon-neutral:disabled,
.btn-icon-danger:disabled,
.btn-icon-active:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-red-500), var(--color-red-700));
    color: var(--color-white);
    box-shadow: 0 12px 28px -12px var(--color-red-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 32px -12px var(--color-red-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-ghost {
    background: var(--color-surface);
    color: var(--color-ink);
    border-color: var(--color-border-light);
}

.btn-ghost:hover {
    background: var(--color-surface-alt);
}

.btn-success {
    background: linear-gradient(135deg, #22c55e, #15803d);
    color: var(--color-white);
    box-shadow: 0 12px 24px -12px rgba(34, 197, 94, 0.45);
}

.btn-success:hover {
    transform: translateY(-1px);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.78rem;
}

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

.btn-icon-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: rgba(255, 84, 104, 0.1);
    color: var(--color-danger-text);
    transition: background-color 0.15s ease;
}

.btn-icon-danger:hover {
    background: rgba(255, 84, 104, 0.2);
}

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

.btn-icon-neutral {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border-light);
    color: var(--color-red-600);
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-icon-neutral:hover {
    background: var(--color-surface);
    border-color: var(--color-red-500);
}

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

.btn-icon-active {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-red-500), var(--color-red-700));
    color: var(--color-white);
    box-shadow: 0 8px 18px -8px var(--color-red-glow);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-icon-active:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 22px -8px var(--color-red-glow);
}

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