/* ===== 基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary: #8ec5fc;
    --primary-dark: #0093e9;
    --secondary: #e0c3fc;
    --bg-dark: #0a0a1a;
    --bg-gradient: linear-gradient(135deg, #0a0a1a 0%, #1a1a2e 50%, #16213e 100%);
    --bg-card: rgba(25, 25, 35, 0.8);
    --bg-card-hover: rgba(35, 35, 50, 0.95);
    --text-light: #f0f8ff;
    --text-dim: #a0a0c0;
    --accent-green: #4ade80;
    --accent-red: #f87171;
    --accent-yellow: #fbbf24;
    --shadow: 0 20px 35px -8px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 25px 45px -8px rgba(142, 197, 252, 0.25);
    --transition: all 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.1);
    --border-glow: 1px solid rgba(142, 197, 252, 0.15);
    --radius-card: 22px;
}
body {
    font-family: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-light);
    min-height: 100vh;
    line-height: 1.6;
    background-attachment: fixed;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 16px;
    position: relative;
}
/* 粒子画布 */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
    display: block;
}
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}
.bg-circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(142, 197, 252, 0.08) 0%, transparent 70%);
    will-change: transform;
}
@keyframes float1 {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 20px); }
}
@keyframes float2 {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-25px, 35px); }
}
@keyframes float3 {
    0% { transform: translate(0, 0); }
    100% { transform: translate(20px, -20px); }
}
@keyframes float4 {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-30px, -15px); }
}
.circle-1 { 
    width: 350px; height: 350px; top: 5%; left: 5%; 
    animation: float1 22s infinite alternate ease-in-out;
}
.circle-2 { 
    width: 250px; height: 250px; bottom: 10%; right: 10%; 
    background: radial-gradient(circle, rgba(224, 195, 252, 0.06) 0%, transparent 70%);
    animation: float2 18s infinite alternate ease-in-out;
}
.circle-3 { 
    width: 200px; height: 200px; top: 40%; right: 20%; 
    background: radial-gradient(circle, rgba(0, 147, 233, 0.04) 0%, transparent 70%);
    animation: float3 25s infinite alternate ease-in-out;
}
.circle-4 { 
    width: 280px; height: 280px; bottom: 20%; left: 15%; 
    background: radial-gradient(circle, rgba(142, 197, 252, 0.05) 0%, transparent 70%);
    animation: float4 20s infinite alternate ease-in-out;
}
.main-container {
    width: 100%;
    max-width: 1500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    min-height: 80vh;
}
.header-container {
    width: 100%;
    display: flex;
    justify-content: center;
    margin: 30px 0 20px;
}
header {
    width: 100%;
    max-width: 1000px;
    text-align: center;
    padding: 40px 30px 35px;
    border-radius: 40px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: var(--border-glow);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--primary), var(--secondary), transparent);
}
header:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(142, 197, 252, 0.3);
}
h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, var(--primary) 40%, var(--secondary) 80%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 1px;
    margin-bottom: 8px;
    line-height: 1.2;
}
.domain-badge {
    display: inline-block;
    margin-top: 8px;
    padding: 8px 24px;
    background: rgba(142, 197, 252, 0.1);
    border-radius: 60px;
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--primary);
    border: 1px solid rgba(142, 197, 252, 0.3);
    backdrop-filter: blur(4px);
}
.tagline {
    color: var(--text-dim);
    font-size: 1.2rem;
    margin-top: 12px;
    letter-spacing: 0.3px;
}
.nav-container {
    margin: 20px 0 40px;
}
.nav-menu {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}
.nav-btn {
    padding: 14px 36px;
    background: rgba(25, 25, 35, 0.7);
    backdrop-filter: blur(8px);
    color: var(--primary);
    border: 1px solid rgba(142, 197, 252, 0.2);
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    text-decoration: none;
}
.nav-btn:hover {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #0a0a1a;
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(142, 197, 252, 0.4);
}
.section {
    width: 100%;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}
.hidden {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none;
    position: absolute;
    width: 100%;
}
/* 科技感返回按钮 - 放大版本 */
.back-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 18px 42px;
    background: rgba(10, 10, 26, 0.7);
    backdrop-filter: blur(12px);
    border: 2px solid rgba(142, 197, 252, 0.5);
    border-radius: 60px;
    color: var(--primary);
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 0 20px rgba(142, 197, 252, 0.3);
    overflow: hidden;
    z-index: 10;
    margin: 20px 0 30px;
    min-width: 220px;
}

.back-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(142, 197, 252, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    z-index: -1;
}

.back-btn:hover::before {
    width: 400px;
    height: 400px;
}

.back-btn:hover {
    border-color: var(--secondary);
    color: #fff;
    box-shadow: 0 0 40px var(--primary);
    transform: translateY(-4px);
    background: rgba(20, 20, 40, 0.8);
}

.back-btn:active {
    transform: translateY(-2px);
}

/* 返回按钮中的箭头图标样式 */
.back-btn span {
    font-size: 1.6rem;
    transition: transform 0.3s ease;
}

.back-btn:hover span {
    transform: translateX(-5px);
}
.api-grid-home {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 25px;
    margin-top: 20px;
    width: 100%;
}
/* 卡片入场动画 */
@keyframes cardAppear {
    0% { opacity: 0; transform: translateY(20px) scale(0.95); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}
.api-square {
    aspect-ratio: 1 / 1;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: var(--border-glow);
    border-radius: 28px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
    animation: cardAppear 0.6s cubic-bezier(0.2, 0.9, 0.3, 1.1) forwards;
    animation-delay: calc(var(--index, 0) * 0.03s);
}
.api-square::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: transform 0.4s ease;
    transform-origin: left;
}
.api-square:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(142, 197, 252, 0.4);
    background: var(--bg-card-hover);
}
.api-square:hover::before {
    transform: scaleX(1);
}
.square-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}
.square-name {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.3;
    word-break: break-word;
}
.square-status {
    font-size: 0.8rem;
    padding: 4px 10px;
    border-radius: 30px;
    background: rgba(74, 222, 128, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(74, 222, 128, 0.3);
    white-space: nowrap;
}
.square-status.premium {
    background: rgba(142, 197, 252, 0.15);
    color: var(--primary);
    border-color: rgba(142, 197, 252, 0.3);
}
.square-desc {
    margin: 15px 0;
    color: var(--text-dim);
    font-size: 0.95rem;
    line-height: 1.4;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.square-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}
.square-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-green);
    background: rgba(74, 222, 128, 0.1);
    padding: 4px 12px;
    border-radius: 40px;
    border: 1px solid rgba(74, 222, 128, 0.2);
}
.square-price.free {
    color: var(--text-dim);
    background: rgba(160, 160, 192, 0.08);
    border-color: rgba(160, 160, 192, 0.2);
}
.square-view {
    font-size: 0.9rem;
    padding: 6px 16px;
    background: rgba(142, 197, 252, 0.1);
    border: 1px solid rgba(142, 197, 252, 0.3);
    border-radius: 40px;
    color: var(--primary);
    transition: var(--transition);
}
.api-square:hover .square-view {
    background: rgba(142, 197, 252, 0.2);
}
.api-detail-card {
    border-radius: var(--radius-card);
    padding: 30px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: var(--border-glow);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}
.detail-title {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 20px;
    word-break: break-word;
}
.detail-method {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 40px;
    background: rgba(142, 197, 252, 0.2);
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 20px;
}
.detail-url {
    background: rgba(0, 0, 0, 0.4);
    padding: 16px 20px;
    border-radius: 18px;
    font-family: monospace;
    word-break: break-all;
    margin: 20px 0;
    border: 1px solid rgba(255,255,255,0.05);
    cursor: pointer;
    transition: var(--transition);
}
.detail-url:hover {
    border-color: var(--primary);
    box-shadow: 0 0 12px rgba(142, 197, 252, 0.3);
}
.params-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
.params-table th {
    text-align: left;
    color: var(--primary);
    font-weight: 600;
    padding: 12px 8px;
    border-bottom: 1px solid rgba(142,197,252,0.2);
}
.params-table td {
    padding: 10px 8px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.params-table tr:last-child td {
    border-bottom: none;
}
.required-badge {
    color: var(--accent-red);
    background: rgba(248,113,113,0.1);
    padding: 2px 8px;
    border-radius: 30px;
    font-size: 0.7rem;
    margin-left: 8px;
}
.detail-price {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent-green);
    background: rgba(74,222,128,0.1);
    padding: 10px 30px;
    border-radius: 60px;
    display: inline-block;
    margin: 15px 0;
}
.detail-limits {
    color: var(--accent-yellow);
    font-weight: 600;
    margin: 10px 0;
}
.detail-note {
    margin-top: 25px;
    padding: 20px;
    background: rgba(251,191,36,0.05);
    border-left: 6px solid var(--accent-yellow);
    border-radius: 16px;
    color: var(--text-dim);
}
.detail-note strong {
    color: var(--accent-yellow);
}
.copy-btn {
    background: rgba(142, 197, 252, 0.1);
    border: 1px solid rgba(142,197,252,0.3);
    color: var(--primary);
    padding: 10px 28px;
    border-radius: 40px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    margin-right: 15px;
}
.copy-btn:hover {
    background: rgba(142,197,252,0.2);
}
.contact-section {
    width: 100%;
    max-width: 1200px;
    margin: 70px auto 50px;
    padding: 40px 30px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border-radius: 50px;
    border: var(--border-glow);
    box-shadow: var(--shadow);
}
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin: 40px 0 20px;
}
.contact-card {
    background: rgba(30, 30, 40, 0.5);
    border-radius: 36px;
    padding: 36px 24px;
    text-align: center;
    backdrop-filter: blur(6px);
    border: 1px solid rgba(142, 197, 252, 0.15);
    transition: var(--transition);
}
.contact-card:hover {
    transform: translateY(-8px);
    background: rgba(40, 40, 55, 0.8);
    border-color: rgba(142, 197, 252, 0.4);
    box-shadow: var(--shadow-hover);
}
.contact-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
}
.contact-title {
    color: var(--primary);
    font-size: 1.7rem;
    margin-bottom: 15px;
}
.contact-detail {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent-yellow);
    background: rgba(251, 191, 36, 0.08);
    padding: 12px 20px;
    border-radius: 60px;
    display: inline-block;
    margin: 15px 0 10px;
    border: 1px solid rgba(251,191,36,0.2);
    cursor: pointer;
    transition: 0.2s;
}
.contact-detail:hover {
    background: rgba(251,191,36,0.15);
    transform: scale(1.02);
}
.copy-success {
    color: var(--accent-green);
    font-size: 0.9rem;
    min-height: 24px;
    opacity: 0;
    transition: 0.2s;
}
.tips-box {
    margin-top: 40px;
    padding: 25px 30px;
    background: rgba(142,197,252,0.05);
    border-radius: 40px;
    border-left: 8px solid var(--primary);
}
.footer-container {
    width: 100%;
    margin-top: 40px;
}
footer {
    text-align: center;
    color: var(--text-dim);
    padding: 30px 20px;
    border-top: 1px solid rgba(142,197,252,0.15);
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin: 20px 0 10px;
}
.footer-link {
    color: var(--primary);
    text-decoration: none;
    padding: 8px 18px;
    border-radius: 30px;
}
.footer-link:hover {
    background: rgba(142,197,252,0.1);
}
.loading {
    text-align: center;
    padding: 50px;
    color: var(--text-dim);
    font-size: 1.2rem;
}
@media (max-width: 700px) {
    h1 { font-size: 2.8rem; }
    .contact-grid { grid-template-columns: 1fr; }
    .api-grid-home { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
    .detail-title { font-size: 1.8rem; }
    .square-name { font-size: 1.2rem; }
    .square-price { font-size: 1rem; padding: 2px 8px; }
    .square-view { padding: 4px 12px; }
    .back-btn {
        padding: 16px 36px;
        font-size: 1.2rem;
        min-width: 180px;
    }
    
    .back-btn span {
        font-size: 1.4rem;
    }
}