:root {
    --nav-height: 80px;
    --nav-gap: 20px;
    --safe-top: calc(var(--nav-height) + var(--nav-gap));
}

html {
    scroll-behavior: smooth;
}

/* index-smooth-scroll.css - 永久固定用户精调数值与紧凑间距排版 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap');

/* 🔒 导航栏常驻最顶端 (z-index 99999) */
.nav {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    z-index: 99999 !important;
    background: #000000 !important;
    box-sizing: border-box;
}

/* 隐藏原生浏览器右侧滚动条 */
html::-webkit-scrollbar, body::-webkit-scrollbar, .scroll-section::-webkit-scrollbar {
    display: none;
    width: 0 !important;
    height: 0 !important;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
    scroll-behavior: smooth;
    color: #ffffff;
    height: 100%;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* 背景蒙版 */
.bg-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.88) 100%);
    z-index: 1;
    pointer-events: none;
}

/* 💻 电脑端规则（>= 769px） */
@media screen and (min-width: 769px) {
    body {
        min-width: 1080px;
    }
}

#sec-hero {
    justify-content: center !important;
}

.scroll-section {
    min-height: 100vh;
    min-height: 100dvh;
    width: 100%;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    position: relative;
    box-sizing: border-box;
    padding: calc(var(--safe-top) + 10px) 40px 50px 40px;
    z-index: 2;
}

/* 右侧侧边小点指示器 */
.section-dots {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: rgba(0, 0, 0, 0.5);
    padding: 10px 6px;
    border-radius: 20px;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.dot-item {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(216, 216, 216, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dot-item:hover {
    background: #00bfff;
    transform: scale(1.3);
}

.dot-item.active {
    background: #00bfff;
    box-shadow: 0 0 12px #00bfff;
    transform: scale(1.4);
    border-color: #ffffff;
}

/* 玻璃拟态卡片 */
.glass-card {
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(0, 191, 255, 0.35);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.7);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px 0 rgba(0, 191, 255, 0.3);
    border-color: rgba(0, 191, 255, 0.6);
}

/* 首屏经典层次排版：左上“这里是九维空间的” + 右下“个人网站” */
.hero-text-box {
    width: 100%;
    max-width: 850px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 0 20px;
    box-sizing: border-box;
}

.hero-title-top {
    font-size: 3.2rem;
    font-weight: 700;
    color: #ffffff;
    text-align: left;
    margin: 0;
    white-space: nowrap;
    text-shadow: 0 4px 20px rgba(0,0,0,0.95), 0 0 10px rgba(0,0,0,0.8);
}

.hero-title-bottom {
    font-size: 4.2rem;
    font-weight: 800;
    color: #ffffff;
    text-align: right;
    margin-top: 10px;
    margin-bottom: 0;
    white-space: nowrap;
    text-shadow: 0 4px 20px rgba(0,0,0,0.95), 0 0 12px rgba(0,0,0,0.9);
}

.scroll-hint {
    position: absolute;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(216, 216, 216, 0.9);
    font-size: 14px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.section-header {
    position: relative;
    text-align: center;
    margin-bottom: 30px;
    z-index: 2;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 10px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.8);
}

.section-header p {
    color: #d8d8d8;
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    width: 100%;
    max-width: 1100px;
}

.tech-card {
    padding: 26px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.tech-icon {
    font-size: 2.2rem;
    background: rgba(0, 191, 255, 0.12);
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid rgba(0, 191, 255, 0.3);
    background: rgba(0, 0, 0, 0.65);
}

.tech-card h3 {
    font-size: 1.3rem;
    color: #00bfff;
    margin: 0;
}

.tech-card p {
    color: #d8d8d8;
    line-height: 1.6;
    font-size: 0.95rem;
    margin: 0;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 6px;
}

.tag-badge {
    background: rgba(0, 191, 255, 0.1);
    color: #d8d8d8;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid rgba(0, 191, 255, 0.25);
}

.cycling-container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.carousel-box {
    position: relative;
    width: 100%;
    height: 360px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.6);
    border: 1px solid rgba(0, 191, 255, 0.3);
    background: rgba(0, 0, 0, 0.65);
}

.carousel-img {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: none;
    transition: opacity 0.5s ease-in-out;
}

.carousel-img.active {
    display: block;
}

.carousel-btn {
    z-index: 2;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.65);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
    z-index: 10;
}

.carousel-btn:hover {
    background: #00bfff;
    border-color: #00bfff;
}

.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }

.carousel-indicators {
    z-index: 2;
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
}

.carousel-dot.active {
    background: #00bfff;
    width: 20px;
    border-radius: 6px;
}

.cycling-info {
    padding: 12px 30px;
    display: flex;
    flex-direction: row;
    background: rgba(20, 20, 20, 0.4);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 10;
}

.cycling-stats {
    display: flex;
    flex-direction: row;
    gap: 30px;
    align-items: center;
}

.stat-item {
    background: transparent;
    padding: 0;
    border-radius: 0;
    border: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: #00bfff;
}

.stat-label {
    display: none;
}

.sports-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    width: 100%;
    max-width: 1080px;
}

.sport-card {
    padding: 26px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: relative;
    overflow: hidden;
}

.sport-badge {
    align-self: flex-start;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    background: rgba(0, 191, 255, 0.15);
    color: #00bfff;
    border: 1px solid rgba(0, 191, 255, 0.4);
}

/* ========================================================================= */
/* 📱 手机端 (精调固定参数：高度 53px, 左右边距 0, Logo 50px, 菜单字号 7px) */
/* ========================================================================= */
@media screen and (max-width: 768px) {
    :root {
        --nav-height: 53px;
        --nav-gap: 16px;
    }
    html, body {
        scroll-snap-type: none !important;
        height: auto !important;
        overflow-y: auto !important;
        min-width: 100% !important;
        width: 100% !important;
        overflow-x: hidden !important;
    }

    .section-dots {
        display: none !important;
    }

    /* 1. 导航栏：高度 53px，左右边距 0，消除多余空隙 */
    .nav {
        padding: 0 0px !important;
        height: 53px !important;
        display: flex !important;
        align-items: center !important;
        overflow: hidden !important;
    }
    .nav table {
        width: 100% !important;
        table-layout: auto !important;
        border-collapse: collapse !important;
    }
    .nav tr {
        display: table-row !important;
    }
    .nav td {
        display: table-cell !important;
        white-space: nowrap !important;
        vertical-align: middle !important;
        padding: 0 1px !important;
    }

    /* Logo 高度固定 50px */
    .logo img {
        height: 50px !important;
        width: auto !important;
        vertical-align: middle;
    }

    /* 左侧标题与全站其他页面保持完全一致的原版字体 */
    .logo h1 {
        font-size: 9.5px !important;
        white-space: nowrap !important;
        margin: 0 2px 0 2px !important;
        display: inline-block !important;
        line-height: 1 !important;
        font-weight: 500 !important;
        color: #ffffff !important;
    }

    /* 右侧菜单：字号固定 7px，靠近左侧标题，解决间距过远问题 */
    .nav ul {
        display: flex !important;
        flex-direction: row !important;
        gap: 3px !important;
        margin: 0 0 0 2px !important;
        padding: 0 !important;
        white-space: nowrap !important;
        justify-content: flex-start !important;
    }
    .nav ul li {
        display: inline-block !important;
        margin: 0 !important;
        white-space: nowrap !important;
    }
    .nav ul li a {
        font-size: 7px !important;
        color: #d8d8d8 !important;
        white-space: nowrap !important;
        padding: 1px 2px !important;
        letter-spacing: 0 !important;
    }
    .nav ul li a:hover {
        color: #ffffff !important;
    }

    .hero-text-box {
        gap: 8px !important;
        padding: 0 8px !important;
    }

    .hero-title-top {
        font-size: 1.6rem !important;
        text-align: left !important;
        white-space: nowrap !important;
    }

    .hero-title-bottom {
        font-size: 2.2rem !important;
        text-align: right !important;
        margin-top: 12px !important;
        white-space: nowrap !important;
    }

#sec-hero {
    justify-content: center !important;
}

    .scroll-section {
        min-height: 100vh !important;
        min-height: 100dvh !important;
        height: auto !important;
        justify-content: flex-start !important;
        padding: calc(var(--safe-top) + 10px) 14px 20px 14px !important;
        box-sizing: border-box !important;
    }

    #sec-hero {
        justify-content: center !important;
        padding-top: 58px !important;
    }

    .scroll-hint {
        bottom: 20px !important;
    }
    .scroll-hint span:last-child {
        font-size: 22px !important;
        filter: drop-shadow(0 0 8px #00bfff);
    }

    .section-header {
        margin-bottom: 14px;
        width: 100%;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }
    .section-header p {
        font-size: 0.85rem;
    }

    .tech-grid, .cycling-container, .sports-container {
        grid-template-columns: 1fr !important;
        gap: 14px !important;
        width: 100% !important;
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: space-around;
    }

    .carousel-box {
        height: 300px !important;
        width: 100% !important;
    }

    .cycling-info, .sport-card, .tech-card {
        padding: 16px !important;
    }

    .section-dots {
        right: 8px;
        padding: 8px 4px;
        gap: 10px;
    }
    .dot-item {
        width: 8px;
        height: 8px;
    }
}

.carousel-bg {
    position: absolute;
    top: -10%; left: -10%;
    width: 120%; height: 120%;
    background-size: cover;
    background-position: center;
    filter: blur(15px) brightness(0.4);
    z-index: 0;
    transition: background-image 0.5s ease-in-out;
}

/* Fix for hero section being hidden under navbar */
#sec-hero {
    justify-content: center !important;
}

#sec-hero {
    justify-content: center !important;
}