body {
    background: linear-gradient(135deg, #f3f4fa 0%, #e6eaf0 100%);
    margin: 0;
    font-family: 'Segoe UI', 'Arial', sans-serif;
    min-height: 100vh;
}
.container {
    max-width: 440px;
    margin: 0 auto;
    padding: 36px 8px 28px 8px;
}
.logo-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 18px;
}
.logo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e0e4ed 0%, #bfc7d1 100%);
    box-shadow: 0 6px 32px rgba(108,99,255,0.13), 0 0 0 8px #25d36633;
    object-fit: contain;
    padding: 10px;
    border: 4px solid #6C63FF;
    outline: 3px solid #fff;
    transition: box-shadow 0.2s, border 0.2s;
}
.logo:hover {
    box-shadow: 0 12px 40px rgba(108,99,255,0.18), 0 0 0 10px #25d36644;
    border-color: #25d366;
}
.lang-switch {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 22px;
}
.lang-switch label span {
    font-weight: 700;
    color: #6C63FF;
    font-size: 1.08rem;
}
.lang-slider {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background: linear-gradient(90deg, #e0e4ed 0%, #f3f4fa 100%);
    border-radius: 32px;
    border: 2.5px solid #6C63FF;
    box-shadow: 0 2px 12px rgba(108,99,255,0.10);
    margin-bottom: 24px;
}
.lang-slider label {
    color: #6C63FF;
    font-weight: 700;
    border-radius: 24px;
    transition: background 0.2s, color 0.2s;
}
.lang-slider input[type="radio"]:checked + label {
    background: linear-gradient(90deg, #6C63FF 0%, #25d366 100%);
    color: #fff;
}
.welcome-text {
    text-align: center;
    color: #3a3a4a;
    margin-bottom: 28px;
}
.welcome-text h2 {
    font-size: 1.45rem;
    font-weight: 700;
    margin: 0 0 7px 0;
    letter-spacing: 0.5px;
    color: #6C63FF;
}
.welcome-text p {
    font-size: 1.02rem;
    margin: 0;
    color: #5a5a6e;
}
.guide-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}
.guide-item {
    display: flex;
    align-items: center;
    background: linear-gradient(90deg, #f6f8fa 0%, #e6eaf0 100%);
    border-radius: 22px;
    padding: 10px 18px;
    box-shadow: 0 2px 12px rgba(108,99,255,0.08);
    min-height: 44px;
    position: relative;
    transition: box-shadow 0.18s, transform 0.18s, background 0.18s, border 0.18s;
    border: 3px solid #6C63FF;
}
.guide-item:hover {
    box-shadow: 0 6px 24px rgba(37,211,102,0.13);
    transform: translateY(-2px) scale(1.025);
    background: linear-gradient(90deg, #e0e4ed 0%, #f3f4fa 100%);
    border: 3px solid #25d366;
}
.guide-item .item-icon {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e0e4ed 0%, #bfc7d1 100%);
    margin-right: 16px;
    object-fit: cover;
    flex-shrink: 0;
    border: 2.5px solid #6C63FF;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 6px rgba(108,99,255,0.10);
    transition: border 0.18s;
}
.guide-item:hover .item-icon {
    border: 2.5px solid #25d366;
}
.guide-item .item-text {
    flex: 1;
    font-size: 1.08rem;
    color: #3a3a4a;
    font-family: inherit;
    font-weight: 900;
    letter-spacing: 0.5px;
}
.guide-item .item-menu {
    font-size: 1.2rem;
    color: #6C63FF;
    margin-left: 10px;
    cursor: pointer;
    user-select: none;
}
.guide-item, .guide-item *, .guide-item:visited, .guide-item:active, .guide-item:hover, .guide-item:focus {
    text-decoration: none !important;
}
.video-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0; top: 0; right: 0; bottom: 0;
    background: rgba(40, 40, 60, 0.35);
    justify-content: center;
    align-items: center;
}
.video-modal-content {
    background: #fff;
    border-radius: 16px;
    padding: 18px 18px 12px 18px;
    box-shadow: 0 8px 32px rgba(80,80,100,0.18);
    max-width: 90vw;
    max-height: 70vh;
    width: 400px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}
.video-modal-close {
    position: absolute;
    top: 10px;
    right: 18px;
    font-size: 1.7rem;
    color: #888;
    cursor: pointer;
    font-weight: bold;
    z-index: 2;
    transition: color 0.2s;
}
.video-modal-close:hover {
    color: #6C63FF;
}
#tutorial-video {
    margin-top: 18px;
    background: #f6f8fa;
}
.product-modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0; top: 0; right: 0; bottom: 0;
    background: rgba(40, 40, 60, 0.35);
    justify-content: center;
    align-items: center;
}
.product-modal-content {
    background: #fff;
    border-radius: 24px;
    padding: 22px 22px 16px 22px;
    box-shadow: 0 8px 32px rgba(108,99,255,0.13);
    max-width: 96vw;
    max-height: 80vh;
    width: 480px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}
.product-modal-close {
    position: absolute;
    top: 12px;
    right: 22px;
    font-size: 2.1rem;
    color: #6C63FF;
    cursor: pointer;
    font-weight: bold;
    z-index: 2;
    transition: color 0.2s;
}
.product-modal-close:hover {
    color: #25d366;
}
.product-carousel {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 18px;
}
.carousel-images {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 120px;
    min-height: 220px;
    position: relative;
}
.carousel-img {
    max-width: 320px;
    max-height: 340px;
    border-radius: 18px;
    box-shadow: 0 2px 12px rgba(108,99,255,0.10);
    background: #f6f8fa;
    position: absolute;
    left: 0; top: 0; right: 0; bottom: 0;
    margin: auto;
    opacity: 0;
    transition: opacity 0.5s;
    z-index: 1;
}
.carousel-img.active {
    opacity: 1;
    z-index: 2;
}
.carousel-thumbnails {
    display: flex;
    flex-direction: row;
    gap: 8px;
    margin-top: 14px;
    overflow-x: auto;
    padding-bottom: 4px;
    justify-content: center;
}
.carousel-thumb {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: 10px;
    border: 2.5px solid #e0e4ed;
    cursor: pointer;
    opacity: 0.7;
    transition: border 0.2s, opacity 0.2s;
    box-shadow: 0 1px 4px rgba(108,99,255,0.08);
    background: #f6f8fa;
}
.carousel-thumb.active {
    border: 2.5px solid #6C63FF;
    opacity: 1;
    box-shadow: 0 2px 8px rgba(108,99,255,0.13);
}
.carousel-prev, .carousel-next {
    background: linear-gradient(135deg, #e0e4ed 0%, #bfc7d1 100%);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.6rem;
    color: #6C63FF;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    box-shadow: 0 1px 6px rgba(108,99,255,0.10);
    margin: 0 6px;
}
.carousel-prev:hover, .carousel-next:hover {
    background: linear-gradient(135deg, #25d366 0%, #6C63FF 100%);
    color: #fff;
    box-shadow: 0 2px 12px rgba(37,211,102,0.13);
}
.lang-slider, .lang-slider label, .lang-slider-bg {
    box-sizing: border-box;
}
.lang-slider label {
    flex: 1 1 0;
    min-width: 0;
    border-radius: 24px;
    font-size: 1.08rem;
    color: #3a3a4a;
    cursor: pointer;
    transition: color 0.2s;
    user-select: none;
    font-weight: 500;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
    background: transparent;
    padding: 0;
}
.lang-slider label span {
    display: block;
    width: 100%;
    padding: 8px 0;
}
.lang-slider input[type="radio"]:checked + label {
    color: #fff;
    font-weight: 700;
}
.lang-slider-bg {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    border-radius: 24px;
    z-index: 1;
    transition: left 0.3s, background 0.3s, width 0.3s;
    box-shadow: 0 2px 12px rgba(108,99,255,0.13), 0 0 0 2px #fff, 0 0 0 4px #6C63FF;
    width: 0;
    background: linear-gradient(90deg, #6C63FF 0%, #25d366 100%);
}
/* 动态滑块位置和宽度 */
.lang-slider input#lang-zh:checked ~ .lang-slider-bg { left: 0; width: 90px; background: linear-gradient(90deg, #6C63FF 0%, #25d366 100%); }
.lang-slider input#lang-en:checked ~ .lang-slider-bg { left: 92px; width: 90px; background: linear-gradient(90deg, #25d366 0%, #6C63FF 100%); }
.lang-slider input#lang-es:checked ~ .lang-slider-bg { left: 184px; width: 110px; background: linear-gradient(90deg, #ff9800 0%, #dd2a7b 100%); }
.lang-slider input#lang-it:checked ~ .lang-slider-bg { left: 296px; width: 110px; background: linear-gradient(90deg, #009e7a 0%, #6C63FF 100%); }