.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;overflow:hidden;padding:.75rem 1rem;border:1px solid transparent;border-radius:var(--radius-2);color:var(--text);font:inherit;font-size:1rem;font-weight:600;text-decoration:none;white-space:nowrap;cursor:pointer;transition:var(--transition-medium)}.btn:focus-visible{outline:none;box-shadow:var(--focus-ring)}.btn:disabled{cursor:not-allowed;opacity:.6;transform:none!important;box-shadow:none!important}.btn.age-confirm-btn{box-shadow:var(--glow-subtle)}.btn.age-confirm-btn:hover:not(:disabled){box-shadow:var(--glow-normal)}.btn.mark-all-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:.5rem;border-radius:6px;transition:var(--transition-fast)}.btn.mark-all-btn:hover:not(:disabled){background:var(--bg-hover);color:var(--text)}.btn__content{display:inline-flex;align-items:center;gap:.5rem;transition:opacity .2s}.btn__spinner{position:absolute;top:50%;left:50%;display:none;transform:translate(-50%,-50%)}.btn.is-loading{pointer-events:none}.btn.is-loading .btn__content{visibility:hidden;opacity:0}.btn.is-loading .btn__spinner{display:inline-flex;align-items:center;justify-content:center}.btn.btn-primary{border-color:var(--border-accent);background:color-mix(in srgb,var(--accent) 6%,transparent);color:var(--accent)}.btn.btn-primary:hover:not(:disabled){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 22%,transparent);box-shadow:var(--glow-subtle)}.btn.btn-primary:hover:not(:disabled):focus-visible{box-shadow:var(--focus-ring),var(--glow-subtle)}.btn.btn-secondary{border-color:var(--border);background:var(--surface-overlay);color:var(--text-muted)}.btn.btn-secondary:hover:not(:disabled){background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--accent);box-shadow:var(--glow-subtle)}.btn.btn-secondary:hover:not(:disabled):focus-visible{box-shadow:var(--focus-ring),var(--glow-subtle)}.btn.btn-danger{border-color:var(--danger);background:var(--danger);color:var(--text-inverse)}.btn.btn-danger:hover:not(:disabled){border-color:var(--danger);box-shadow:0 0 16px rgba(var(--danger-rgb),.4)}.btn.btn-danger-ghost{border-color:color-mix(in srgb,var(--danger) 30%,transparent);background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger)}.btn.btn-danger-ghost:hover:not(:disabled){border-color:var(--danger);background:var(--danger);color:var(--text-inverse)}.btn.btn-success{border-color:var(--success);background:var(--success);color:var(--text-inverse)}.btn.btn-success:hover:not(:disabled){border-color:var(--success);box-shadow:var(--glow-subtle)}.btn.btn-warning{border-color:var(--warning);background:var(--warning);color:var(--text-inverse)}.btn.btn-warning:hover:not(:disabled){border-color:var(--warning);box-shadow:var(--shadow-md)}.btn.btn-neon{border-color:var(--border);background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--accent)}.btn.btn-neon:hover:not(:disabled){border-color:var(--border-accent);background:color-mix(in srgb,var(--accent) 18%,transparent);box-shadow:var(--glow-subtle);transform:translateY(-2px)}.btn.btn-action{padding:.5rem 1rem;border-color:var(--border);border-radius:var(--radius-1);background:var(--surface-overlay);color:var(--text-muted);font-size:.875rem}.btn.btn-action:hover:not(:disabled){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--accent)}.btn.btn-icon-only,.btn.btn-icon,.btn.btn-ghost{background:transparent;color:var(--text-muted)}.btn.btn-icon-only,.btn.btn-icon{padding:.5rem;border-color:transparent;border-radius:var(--radius-1)}.btn.btn-icon-only:hover:not(:disabled),.btn.btn-icon:hover:not(:disabled),.btn.btn-ghost:hover:not(:disabled){background:var(--bg-hover);color:var(--text)}.btn.btn-retry{border-color:color-mix(in srgb,var(--warning) 30%,transparent);background:color-mix(in srgb,var(--warning) 12%,transparent);color:var(--warning)}.btn.btn-retry:hover:not(:disabled){border-color:var(--warning);background:color-mix(in srgb,var(--warning) 20%,transparent)}.btn.btn-google{border-color:#dadce0;background:var(--c-white);color:#757575;box-shadow:var(--shadow-xs)}.btn.btn-google:hover:not(:disabled){border-color:#c1c1c1;box-shadow:var(--shadow-sm)}.btn.btn-link{position:relative;display:inline-flex;align-items:center;padding:0;border:none;background:transparent;color:var(--accent);font-size:inherit;font-weight:600;text-decoration:none;cursor:pointer}.btn.btn-link:after{content:"";position:absolute;bottom:-2px;left:0;width:0;height:2px;background:var(--gradient-primary);transition:width .3s ease}.btn.btn-link:hover{color:var(--accent);text-decoration:none;text-shadow:0 0 8px color-mix(in srgb,var(--accent) 60%,transparent);transform:translateY(-1px)}.btn.btn-link:hover:after{width:100%}.btn.btn-outline{border-color:var(--border);background:transparent;color:var(--text)}.btn.btn-outline:hover:not(:disabled){border-color:var(--accent);background:color-mix(in srgb,var(--text) 5%,transparent)}.btn.btn-outline-primary{border-color:var(--accent);color:var(--accent)}.btn.btn-outline-primary:hover:not(:disabled){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent)}.btn.btn-outline-danger{border-color:var(--danger);color:var(--danger)}.btn.btn-outline-danger:hover:not(:disabled){border-color:var(--danger);background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger)}.btn.btn-xs{padding:.25rem .5rem;font-size:.75rem}.btn.btn-sm{padding:.5rem .75rem;font-size:.875rem}.btn.btn-md{padding:.75rem 1.25rem;font-size:1rem}.btn.btn-lg{padding:1rem 1.75rem;font-size:1.1rem}.btn.btn-xl{padding:1.25rem 2.5rem;font-size:1.25rem}.btn.btn-full{width:100%;white-space:normal}.btn.btn-full-max{width:100%;max-width:300px;white-space:normal}.btn.btn-flex-1{flex:1;min-width:0;white-space:normal}