.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.75rem 1rem; border-radius: 0.5rem; font-weight: 600;
    cursor: pointer; border: 1px solid transparent; transition: all 0.2s ease;
    text-decoration: none; gap: 0.5rem;
    position: relative;
    min-height: 46px;
}
.btn-primary { background-color: var(--primary-color); color: var(--primary-text-color); width: 100%; font-size: 1.125rem; }
.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover-color); }
.btn-secondary { background-color: var(--secondary-color); color: var(--primary-text-color); }
.btn-secondary:hover { background-color: var(--secondary-hover-color); }
.btn-icon { background: none; border: none; padding: 0.5rem; color: var(--text-muted-color); min-height: auto; }
.btn-icon:hover { color: var(--text-color); }
.btn-special { background-color: var(--success-color); color: var(--primary-text-color); }
.btn-special:hover { background-color: #059669; }
.btn-install {
    width: 100%;
    background-color: var(--success-color);
    color: var(--primary-text-color);
    font-size: 1.1rem;
    padding: 0.8rem 1rem;
}
.btn-install:hover { background-color: #059669; }
.btn-danger {
    background-color: var(--error-color);
    color: var(--primary-text-color);
    border: 1px solid var(--error-color);
}
.btn-danger:hover {
    background-color: #c53030;
}
.btn svg { width: 20px; height: 20px; }
.button-row { display: flex; gap: 1rem; margin-top: 1rem; }
.button-row .btn { flex-grow: 1; }
.btn:disabled {
    cursor: not-allowed;
    opacity: 0.65;
}

.btn .btn-content, .btn.loading .loading-dots {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: opacity 0.2s, visibility 0.2s;
}
.btn.loading .btn-content {
    opacity: 0;
    visibility: hidden;
}
.loading-dots {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
}
.loading-dots .loading-text {
    font-size: 0.95rem;
    font-weight: 600;
    margin-left: 0.75rem;
    transition: opacity 0.3s ease-in-out;
}
.loading-dots .dot-container { display: flex; align-items: center; }
.loading-dots .dot-container > div {
    width: 8px; height: 8px; margin: 0 3px;
    border-radius: 50%;
    background-color: var(--primary-text-color);
    animation: dot-bounce 1.4s infinite ease-in-out both;
}
.loading-dots .dot-container > div:nth-child(1) { animation-delay: -0.32s; }
.loading-dots .dot-container > div:nth-child(2) { animation-delay: -0.16s; }
@keyframes dot-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

#toast-container {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    pointer-events: none;
    width: calc(100% - 2rem);
    max-width: 500px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    color: #fff;
    background-color: var(--secondary-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    width: 100%;
    user-select: none;
    touch-action: none;
    pointer-events: auto;
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.2, 1, 0.4, 1), opacity 0.3s ease;
}
.toast.show {
    opacity: 1;
    transform: translateY(0) scale(1);
}
.toast.dismissing {
    opacity: 0 !important;
    transform: translateY(10px) scale(0.9) !important;
}
.toast.swipe-right {
    opacity: 0 !important;
    transform: translateX(120%) !important;
}
.toast.swipe-left {
    opacity: 0 !important;
    transform: translateX(-120%) !important;
}
.toast.dragging {
    transition: none;
}
.toast.clickable {
    cursor: pointer;
}
.toast.toast-success { background-color: var(--success-color); }
.toast.toast-error { background-color: var(--error-color); }
.toast.toast-info { background-color: var(--info-color); }
.toast.toast-warning { background-color: var(--warning-color); }

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-grow: 1;
}
.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}
.toast-icon svg {
    width: 100%;
    height: 100%;
}
.toast-text {
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.5;
}
.toast-close-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    font-size: 1.5rem;
    line-height: 1;
    padding: 0 0.25rem;
    margin-right: -0.25rem;
    align-self: flex-start;
    transition: color 0.2s ease;
}
.toast-close-btn:hover {
    color: white;
}

.info-icon { cursor: pointer; color: var(--text-muted-color); }
.info-icon:hover { color: var(--primary-color); }
.info-icon svg { width: 14px; height: 14px; }
.modal-title { font-size: 1.25rem; font-weight: bold; margin: 0; }
.close-btn { font-size: 2rem; font-weight: bold; cursor: pointer; color: var(--text-muted-color); line-height: 1; }

.loader {
    width: 24px; height: 24px;
    border: 3px solid var(--primary-color);
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block; box-sizing: border-box;
    animation: rotation 1s linear infinite;
}
@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.online-mode-toggle {
    position: relative; display: inline-block;
    width: 50px; height: 28px; cursor: pointer;
}
.online-mode-toggle input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--secondary-color);
    transition: .4s;
    border: 1px solid var(--border-color);
}
.slider.round { border-radius: 34px; }
.slider:before {
    position: absolute; content: "";
    height: 20px; width: 20px; left: 4px; bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
.slider::after {
    content: '';
    position: absolute;
    right: 7px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background-color: var(--success-color);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}
body.online-mode .slider::after {
    opacity: 1;
    animation: pulse-animation 1.5s infinite;
}
@keyframes pulse-animation {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}
input:checked + .slider { background-color: var(--success-color); border-color: var(--success-color); }
input:checked + .slider:before { transform: translateX(22px); }
.online-mode-toggle .toggle-icon-on,
.online-mode-toggle .toggle-icon-off {
    position: absolute; top: 50%; transform: translateY(-50%);
    color: white; transition: opacity 0.3s ease;
    display: flex; align-items: center; justify-content: center;
}
.online-mode-toggle .toggle-icon-on { right: 7px; opacity: 0; }
.online-mode-toggle .toggle-icon-off { left: 7px; opacity: 1; }
input:checked ~ .toggle-icon-on { opacity: 1; }
input:checked ~ .toggle-icon-off { opacity: 0; }
body.online-mode .toggle-icon-on svg { display: none; }

.setting-group { margin-bottom: 1.5rem; }
.setting-group:last-child { margin-bottom: 0; }
.setting-title {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 0.75rem;
}
.setting-title > span:first-child { display: flex; align-items: center; gap: 0.75rem; }
.setting-title svg { color: var(--primary-color); }
.setting-description { font-size: 0.875rem; color: var(--text-muted-color); margin-bottom: 1rem; line-height: 1.7; }
.setting-control { margin-top: 0.5rem; }

@media (max-width: 768px) {
    .btn {
        padding: 0.75rem 0.5rem; font-size: 0.9rem;
        min-height: 48px; flex-direction: row; gap: 0.5rem; line-height: 1.2;
    }
    .btn svg { width: 18px; height: 18px; flex-shrink: 0; }
    .btn-primary { font-size: 1rem; }
    .online-mode-toggle { width: 45px; height: 25px; }
    .slider:before { height: 18px; width: 18px; left: 3px; bottom: 3px; }
    input:checked + .slider:before { transform: translateX(20px); }
}