* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    user-select: none;
}

html {
    scroll-behavior: smooth
}

body {
    background: #0b0e17;
    color: #e6e6e6;
    overflow-x: hidden;
    background-image: radial-gradient(circle at 20% 30%, rgba(14,24,24,0.7), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(22,12,40,0.7), transparent 50%);
}

#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1
}

.top-line {
    height: 2px;
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    background: linear-gradient(90deg, #00ffff, #7728ff, #ff0080, #00ffff);
    background-size: 400% 100%;
    animation: flow 8s linear infinite
}

@keyframes flow {
    0% { background-position: 0 0 }
    100% { background-position: 400% 0 }
}

.nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 99;
    padding: 18px 0;
    background: rgba(12,14,20,0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(119,40,255,0.2);
    transition: 0.3s;
}

.nav-wrap {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px
}

.logo {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(90deg, #0ef, #7728ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 15px currentColor;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    gap: 32px
}

.nav-menu a {
    color: #ccc;
    text-decoration: none;
    transition: .3s;
    font-size: 16px;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #7728ff, #ff0080);
    transition: 0.3s;
}

.nav-menu a:hover {
    color: #fff;
}

.nav-menu a:hover::after {
    width: 100%;
}

.wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px
}

.hero {
    padding: 180px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(119,40,255,0.15), transparent 60%);
    z-index: -1;
    animation: pulse 6s ease-in-out infinite;
}

@keyframes pulse {
    0%,100% { transform: translateX(-50%) scale(1); opacity: 0.8; }
    50% { transform: translateX(-50%) scale(1.1); opacity: 1; }
}

.hero h1 {
    font-size: 52px;
    background: linear-gradient(90deg, #00ffff, #7728ff, #ff0080);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: flicker 3s infinite alternate;
    text-shadow: 0 0 25px currentColor;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

@keyframes flicker {
    0% { filter: brightness(1) drop-shadow(0 0 15px rgba(119,40,255,0.2)) }
    100% { filter: brightness(1.2) drop-shadow(0 0 30px rgba(119,40,255,0.4)) }
}

.hero p {
    margin-top: 14px;
    font-size: 20px;
    color: #aaa;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
    opacity: 0.9;
}

.hero-btns {
    margin-top: 40px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 13px 28px;
    border-radius: 10px;
    font-weight: bold;
    text-decoration: none;
    transition: .3s;
    display: inline-block;
    overflow: hidden;
    position: relative;
    font-size: 15px;
    border: none;
    cursor: pointer;
}

.hero-btns .btn {
    padding: 16px 34px;
    font-size: 16px;
}

.btn-primary {
    background: linear-gradient(90deg, #7728ff, #ff0080);
    color: #fff;
    box-shadow: 0 0 20px rgba(119,40,255,0.3);
}

.btn-secondary {
    background: rgba(30, 36, 54, 0.85);
    color: #e0e0e0;
    border: 1px solid rgba(119, 40, 255, 0.3);
    backdrop-filter: blur(6px);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(119,40,255,0.2);
}
.btn:active { transform: scale(0.98); }

.title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 30px;
    background: linear-gradient(90deg, #0ef, #7728ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 15px currentColor;
    letter-spacing: 1px;
}

.features { padding: 80px 0 }

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px
}

.card {
    background: rgba(18,22,34,0.8);
    border: 1px solid rgba(119,40,255,0.15);
    border-radius: 14px;
    padding: 32px;
    position: relative;
    overflow: hidden;
    transition: .3s;
    backdrop-filter: blur(8px);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(119,40,255,0.08), transparent);
    animation: sweep 5s infinite linear
}

@keyframes sweep {
    0% { left: -100% }
    100% { left: 100% }
}

.card:hover { transform: translateY(-8px); border-color: #7728ff; box-shadow: 0 8px 25px rgba(119,40,255,0.15); }
.card:active { transform: scale(0.99); }
.card h3 { margin-bottom: 14px; color: #fff; font-size: 22px; }
.card p { color: #aaa; font-size: 15px; line-height: 1.7 }

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px
}
.tag {
    padding: 6px 14px;
    background: rgba(24,28,42,0.8);
    border: 1px solid rgba(42,48,70,0.8);
    border-radius: 30px;
    font-size: 13px;
    color: #aaa
}

.demo-faq-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.console {
    background: #090b11;
    border: 1px solid #1e2436;
    border-radius: 10px;
    padding: 24px;
    font-family: Consolas, monospace;
    line-height: 1.8;
    color: #00ff99;
    min-height: 360px;
    transition: 0.3s;
}

.console-content { display: inline; }
.console-cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: #00ff99;
    animation: blink 1s step-end infinite;
    margin-left: 2px;
}

@keyframes blink { 50% { opacity: 0; } }

.faq-box {
    background: rgba(18,22,34,0.8);
    border: 1px solid rgba(119,40,255,0.2);
    border-radius: 14px;
    padding: 24px;
    min-height: 360px;
    max-height: 520px;
    overflow-y: auto;
    backdrop-filter: blur(8px);
}
.faq-box::-webkit-scrollbar {
    width: 10px;
}
.faq-box::-webkit-scrollbar-thumb {
    background: rgba(119,40,255,0.35);
    border-radius: 999px;
}
.faq-box::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.03);
}
.faq-head {
    background: linear-gradient(90deg,#7728ff,#ff0080);
    color: #fff;
    font-weight: bold;
    text-align: center;
    padding: 8px;
    border-radius: 8px;
    margin-bottom: 20px;
}
.faq-item { padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.faq-q {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 15px;
    cursor: pointer;
}
.faq-q span {
    color: #7728ff;
    transition: 0.2s;
    font-weight: bold;
}
.faq-a {
    padding-top: 0;
    color: #aaa;
    font-size: 14px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.25s ease, padding-top 0.3s ease;
}
.faq-item.active .faq-a {
    display: block;
    max-height: 140px;
    opacity: 1;
    padding-top: 8px;
}
.faq-item.active .faq-q span { transform: rotate(45deg); }

.vip-section { padding: 80px 0 }
.vip-compare {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    align-items: stretch;
}

.vip-card {
    background: rgba(19,23,36,0.9);
    border-radius: 16px;
    padding: 28px 24px;
    border: 1px solid rgba(37,43,63,0.8);
    position: relative;
    overflow: hidden;
    text-align: center;
    transition: all 0.35s ease;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
}

.vip-card.free { border-color: rgba(37,43,63,0.8); }
.vip-card.ultra {
    border-color: #ff0080;
    background: rgba(30,20,45,0.95);
    box-shadow: 0 0 40px rgba(255,0,128,0.25);
    transform: scale(1.03);
    z-index: 3;
}
.vip-card.pro {
    border-color: #7728ff;
    background: rgba(25,30,50,0.95);
    box-shadow: 0 0 30px rgba(119,40,255,0.2);
    transform: scale(1.02);
    z-index: 2;
}

.vip-card:hover { transform: translateY(-6px); }
.vip-tag {
    padding: 5px 12px;
    border-radius: 30px;
    display: inline-block;
    margin-bottom: 16px;
    font-size: 12px;
    color: #fff;
    font-weight: bold;
}
.vip-tag.free { background: #252b3f; }
.vip-tag.ultra { background: linear-gradient(90deg, #7728ff, #ff0080); }
.vip-tag.pro { background: #7728ff; }

.vip-name {
    font-size: 20px;
    color: #fff;
    margin-bottom: 6px;
    font-weight: bold;
}

.vip-desc {
    color: #aaa;
    font-size: 13px;
    margin-bottom: 16px;
}

.vip-price {
    font-size: 32px;
    font-weight: bold;
    background: linear-gradient(90deg, #00ffff, #7728ff, #ff0080);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 22px;
    text-shadow: 0 0 12px currentColor;
}

.vip-features {
    list-style: none;
    margin-bottom: 28px;
    flex-grow: 1;
    text-align: left;
}

.vip-features li {
    padding: 8px 0;
    color: #ddd;
    font-size: 14px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    border-bottom: 1px dashed rgba(34,40,58,0.5);
}

.vip-features li span {
    color: #00ff99;
    font-weight: bold;
    font-size: 14px;
    line-height: 1.4;
    min-width: 18px;
}

.vip-features li.no span { color: #ff4444; }

.vip-btn {
    display: block;
    padding: 12px 0;
    border-radius: 10px;
    text-decoration: none;
    font-weight: bold;
    font-size: 14px;
    transition: 0.3s;
    text-align: center;
}

.vip-btn-free {
    background: rgba(34,40,58,0.9);
    color: #ccc;
}

.vip-btn-ultra {
    background: linear-gradient(90deg, #ff0080, #7728ff);
    color: #fff;
    box-shadow: 0 0 20px rgba(255,0,128,0.2);
}

.vip-btn-pro {
    background: linear-gradient(90deg, #7728ff, #ff0080);
    color: #fff;
    box-shadow: 0 0 15px rgba(119,40,255,0.15);
}

.vip-btn:hover {
    filter: brightness(1.15);
    transform: scale(1.02);
}

.steps { padding: 80px 0 }
.step-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px
}
.step-item { text-align: center }
.step-num {
    width: 48px;
    height: 48px;
    background: linear-gradient(90deg, #7728ff, #ff0080);
    border-radius: 50%;
    color: #fff;
    display: grid;
    place-items: center;
    margin: 0 auto 16px;
    font-weight: bold;
    font-size: 18px;
    box-shadow: 0 0 15px rgba(119,40,255,0.2);
}
.step-item h4 { margin-bottom: 8px; font-size: 18px; }
.step-item p { color: #aaa; font-size: 14px; line-height: 1.6; }

.download-notice {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(119,40,255,0.1), rgba(255,0,128,0.1));
    margin: 0 20px;
    border-radius: 20px;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(119,40,255,0.2);
}
.download-notice .wrap {
    text-align: center;
}
.download-notice h2 {
    font-size: 48px;
    font-weight: bold;
    background: linear-gradient(90deg, #fff, #f0f0f0);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 24px;
}
.download-notice .notice-text {
    font-size: 18px;
    color: #ccc;
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto 32px;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 42px;
    min-width: 240px;
    white-space: nowrap;
    background: #000;
    color: #fff;
    font-size: 24px;
    font-weight: bold;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    background-clip: padding-box;
    position: relative;
}
.download-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    padding: 2px;
    background: linear-gradient(90deg, #7728ff, #ff0080);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}
.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(119,40,255,0.3);
}
.download-btn-group {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 20px;
}

.download-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: rgba(30, 36, 54, 0.85);
    color: #e0e0e0;
    font-size: 20px;
    font-weight: bold;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid rgba(119, 40, 255, 0.3);
    backdrop-filter: blur(6px);
    position: relative;
}

.download-btn-secondary::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    padding: 1px;
    background: linear-gradient(90deg, #7728ff, #ff0080);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.download-btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(119,40,255,0.3);
    color: #fff;
}

.download-btn-secondary:hover::before {
    opacity: 1;
}
.download-info {
    margin-top: 24px;
    font-size: 16px;
    color: #aaa;
}
.download-info span {
    color: #7728ff;
    font-weight: bold;
}

.contact-section {
    padding: 70px 0;
    background: rgba(12,14,22,0.9);
    border-top: 1px solid rgba(119,40,255,0.3);
    border-bottom: 1px solid rgba(119,40,255,0.3);
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}
.contact-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(119,40,255,0.06), transparent);
    animation: sweep 8s infinite linear;
}
.contact-wrap {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}
.contact-title {
    font-size: 28px;
    margin-bottom: 40px;
    background: linear-gradient(90deg, #00ffff, #7728ff, #ff0080);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: bold;
    text-shadow: 0 0 12px currentColor;
}
.contact-items {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}
.contact-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 24px;
    background: rgba(25,30,50,0.7);
    border: 1px solid rgba(119,40,255,0.25);
    border-radius: 12px;
    font-size: 16px;
    color: #eee;
    transition: 0.3s;
    backdrop-filter: blur(6px);
}
.contact-item:hover {
    border-color: #7728ff;
    background: rgba(35,40,65,0.8);
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(119,40,255,0.15);
}
.contact-item strong {
    background: linear-gradient(90deg, #0ef, #7728ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: bold;
}

#topBtn {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 44px;
    height: 44px;
    background: linear-gradient(90deg, #7728ff, #ff0080);
    color: #fff;
    border-radius: 50%;
    display: grid;
    place-items: center;
    cursor: pointer;
    z-index: 999;
    font-size: 18px;
    box-shadow: 0 4px 15px rgba(119,40,255,0.3);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px) scale(0.9);
}
#topBtn.show {
    opacity: 1;
    transform: translateY(0) scale(1);
}
#topBtn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 6px 20px rgba(119,40,255,0.4);
}

.footer {
    padding: 40px 20px;
    text-align: center;
    color: #666;
    margin-top: 0;
}

.fade {
    opacity: 0;
    transform: translateY(20px);
    animation: fade-in 1s forwards
}

@keyframes fade-in {
    to { opacity: 1; transform: translateY(0) }
}

.d1 { animation-delay: .1s }
.d2 { animation-delay: .2s }
.d3 { animation-delay: .3s }

@media (max-width: 992px) {
    .vip-compare { grid-template-columns: 1fr; gap: 20px; }
    .vip-card.ultra, .vip-card.pro { transform: scale(1); }
    .demo-faq-wrap { grid-template-columns: 1fr; }
    .download-notice h2 { font-size: 36px; }
    .download-btn { padding: 14px 36px; font-size: 20px; }
    .download-btn-secondary { padding: 10px 20px; font-size: 16px; }
}
@media (max-width: 768px) {
    .nav-menu { gap: 14px; font-size: 14px; }
    .hero h1 { font-size: 36px; }
    .hero p { font-size: 16px; }
    .hero-btns { flex-direction: row; flex-wrap: wrap; }
    .download-notice h2 { font-size: 28px; }
    .download-notice .notice-text { font-size: 16px; }
    .download-btn-group { flex-direction: row; gap: 15px; }
    .contact-items { gap: 20px; }
    .contact-item { padding: 12px 18px; font-size: 15px; }
}