/* =========================================================
   Sensoul 产品介绍页 — 样式表
   配色：温暖珊瑚粉 + 蜜桃粉 渐变（契合 Sensoul Logo 粉系配色）
   ========================================================= */

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 —— 基于 logo 暖粉系 */
    --pink: #FF5C8A;       /* logo 文字珊瑚粉 */
    --pink-soft: #FF9AB3;  /* 浅蜜桃粉 */
    --pink-deep: #E63870;  /* 深珊瑚粉 */
    --peach: #FFB7C8;      /* 蜜桃粉 */
    --rose: #FF4D7D;       /* 主强调色 */

    /* 渐变 —— 纯暖粉系，去紫色 */
    --grad-main: linear-gradient(135deg, #FF9AB3 0%, #FF5C8A 55%, #FF4075 100%);
    --grad-soft: linear-gradient(135deg, #FFD6E1 0%, #FFB7C8 100%);
    --grad-text: linear-gradient(120deg, #FF4D7D, #FF9AB3);

    /* 中性色 */
    --ink: #3B1A28;        /* 暖深棕粉 */
    --ink-soft: #6B4A58;   /* 柔和粉棕 */
    --muted: #9A7A88;      /* 柔和灰粉 */
    --line: rgba(255, 92, 138, 0.16);
    --bg: #FFF3F6;         /* 极淡粉底 */
    --card: #ffffff;

    /* 阴影 —— 改为暖粉阴影 */
    --shadow-sm: 0 4px 14px rgba(255, 92, 138, 0.10);
    --shadow-md: 0 12px 32px rgba(255, 92, 138, 0.18);
    --shadow-lg: 0 24px 60px rgba(255, 92, 138, 0.26);
    --shadow-pink: 0 18px 44px rgba(255, 92, 138, 0.42);

    --radius: 18px;
    --radius-lg: 28px;
    --maxw: 1200px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Segoe UI", system-ui, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 100%;
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 820px;
}

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 15px 34px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform .28s cubic-bezier(.2,.8,.2,1), box-shadow .28s, filter .28s;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--grad-main);
    color: #fff;
    box-shadow: var(--shadow-pink);
}

.btn-primary:hover {
    transform: translateY(-3px);
    filter: brightness(1.05);
    box-shadow: 0 24px 54px rgba(255, 94, 138, 0.55);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.7);
    color: var(--pink-deep);
    border: 1.5px solid var(--line);
    backdrop-filter: blur(6px);
}

.btn-ghost:hover {
    transform: translateY(-3px);
    border-color: var(--pink);
    color: var(--rose);
}

/* =========================================================
   顶部导航
   ========================================================= */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    transition: background .3s, box-shadow .3s, padding .3s;
}

.nav.scrolled {
    background: rgba(255, 248, 251, 0.85);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow-sm);
    padding: 10px 0;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 22px;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--grad-main);
    box-shadow: var(--shadow-sm);
}

.brand-name {
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: .5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--ink-soft);
    position: relative;
    transition: color .25s;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: var(--grad-main);
    border-radius: 2px;
    transition: width .3s;
}

.nav-link:hover {
    color: var(--rose);
}

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

.nav-cta {
    background: var(--grad-main);
    color: #fff !important;
    padding: 10px 24px;
    border-radius: 50px;
    box-shadow: var(--shadow-sm);
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    transform: translateY(-2px);
    filter: brightness(1.06);
    box-shadow: var(--shadow-pink);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    width: 26px;
    height: 2.5px;
    background: var(--ink);
    border-radius: 3px;
    transition: .3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* =========================================================
   首屏 Hero
   ========================================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 15% 20%, rgba(255, 154, 179, 0.32), transparent 60%),
        radial-gradient(ellipse 55% 50% at 85% 30%, rgba(255, 92, 138, 0.26), transparent 60%),
        radial-gradient(ellipse 50% 40% at 50% 100%, rgba(255, 64, 117, 0.18), transparent 60%),
        linear-gradient(180deg, #FFF3F6 0%, #FFE1E8 100%);
    z-index: 0;
}

.hero-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.5) 0, transparent 2px),
        radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.4) 0, transparent 2px),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.5) 0, transparent 2px);
    background-size: 180px 180px;
    opacity: .6;
}

.hero-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 7px 18px;
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--line);
    backdrop-filter: blur(8px);
    font-size: 13px;
    font-weight: 600;
    color: var(--pink-deep);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: clamp(2.4rem, 5vw, 4rem);
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.hero-title .accent {
    background: var(--grad-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    color: var(--ink-soft);
    margin-bottom: 28px;
    max-width: 540px;
}

.hero-desc b {
    color: var(--rose);
    font-weight: 600;
}

.hero-meta {
    display: inline-flex;
    align-items: center;
    gap: 22px;
    padding: 14px 26px;
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    margin-bottom: 34px;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.meta-label {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: .5px;
}

.meta-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--pink-deep);
}

.meta-divider {
    width: 1px;
    height: 32px;
    background: var(--line);
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ---------- 三图叠加区（手机竖版 9:16，水平扇形展开，便于悬停切换） ---------- */
.shots {
    position: relative;
    height: 560px;
    width: 100%;
    perspective: 1200px;
    margin: 0 auto;
}

.shot {
    position: absolute;
    top: 0;
    /* 三张图占 shot 容器高度的 90%，保证水平展开后每张都足够大 */
    height: 90%;
    aspect-ratio: 9 / 16;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--grad-soft);
    box-shadow: var(--shadow-md);
    transition: transform .55s cubic-bezier(.2,.8,.2,1), box-shadow .55s, z-index 0s, opacity .35s;
    cursor: pointer;
    border: 4px solid #fff;
    transform-origin: center bottom;
    /* 每张各自独立的水平位置：shot-1 右 / shot-2 中 / shot-3 左 */
}

.shot img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 水平扇形展开：
   shot-3 → 左（-32% X 偏移 + 逆时针旋转）
   shot-2 → 中（居中 + 几乎不旋转）
   shot-1 → 右（+32% X 偏移 + 顺时针旋转）
   每张之间有轻微重叠（15% 左右），但绝大部分区域独立，便于悬停切换 */
.shot-3 {
    left: 4%;
    transform: rotate(-10deg) translateY(3%);
    z-index: 1;
}

.shot-2 {
    left: 50%;
    transform: translateX(-50%) rotate(0deg) translateY(0);
    z-index: 2;
}

.shot-1 {
    right: 4%;
    transform: rotate(10deg) translateY(3%);
    z-index: 1;
}

/* 悬停时该图置顶、放大、正立，并居中 */
.shots .shot.is-active {
    z-index: 10;
    left: 50%;
    right: auto;
    transform: translateX(-50%) rotate(0deg) translateY(-2%) scale(1.08);
    box-shadow: 0 30px 70px rgba(255, 64, 117, 0.40);
}

/* 当某张图被激活时，其余图进一步下沉、透明度降低 */
.shots.has-active .shot:not(.is-active) {
    opacity: .5;
    filter: saturate(.85);
}

.shots-hint {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    font-size: 13px;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.7);
    padding: 6px 16px;
    border-radius: 50px;
    backdrop-filter: blur(8px);
    white-space: nowrap;
    transition: opacity .3s;
    z-index: 5;
}

.shots.has-active .shots-hint {
    opacity: 0;
}

/* =========================================================
   通用 Section
   ========================================================= */
.section {
    padding: 100px 0;
    position: relative;
}

.section-head {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--rose);
    background: rgba(255, 94, 138, 0.1);
    padding: 6px 16px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 14px;
}

.section-sub {
    font-size: 1.05rem;
    color: var(--muted);
    max-width: 560px;
    margin: 0 auto;
}

/* ---------- 功能卡片 ---------- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
}

.feature-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 36px 30px;
    transition: transform .35s, box-shadow .35s, border-color .35s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--grad-main);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .4s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 58px;
    height: 58px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    background: var(--grad-soft);
    color: var(--rose);
    margin-bottom: 20px;
    transition: transform .4s;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(-6deg);
    background: var(--grad-main);
    color: #fff;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--ink-soft);
    font-size: 0.97rem;
}

/* ---------- 用户评价 ---------- */
.reviews {
    background:
        radial-gradient(ellipse at top, rgba(255, 154, 179, 0.08), transparent 60%),
        var(--bg);
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
}

.review-card {
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--line);
    transition: transform .35s, box-shadow .35s;
    position: relative;
}

.review-card::before {
    content: "\201C";
    position: absolute;
    top: 10px;
    right: 26px;
    font-size: 72px;
    line-height: 1;
    color: var(--pink-soft);
    opacity: .35;
    font-family: Georgia, serif;
}

.review-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.review-stars {
    color: #ffb84d;
    font-size: 16px;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.review-card blockquote {
    font-size: 1rem;
    color: var(--ink);
    margin-bottom: 22px;
    line-height: 1.75;
}

.review-card figcaption {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.92rem;
    color: var(--ink-soft);
    font-weight: 600;
}

.review-card .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--grad-main);
    flex-shrink: 0;
}

/* ---------- FAQ ---------- */
.faq {
    background:
        radial-gradient(ellipse at bottom, rgba(255, 94, 138, 0.06), transparent 60%),
        var(--bg);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 4px 26px;
    transition: box-shadow .3s, border-color .3s;
    overflow: hidden;
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-item[open] {
    border-color: var(--pink-soft);
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 20px 0;
    font-size: 1.08rem;
    font-weight: 600;
    color: var(--ink);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    font-size: 24px;
    color: var(--rose);
    font-weight: 300;
    transition: transform .3s;
    flex-shrink: 0;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 0 22px;
    color: var(--ink-soft);
    font-size: 0.98rem;
    line-height: 1.8;
    animation: faqIn .35s ease;
}

@keyframes faqIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   下载区域（着重突出）
   ========================================================= */
.download {
    position: relative;
    padding: 120px 0;
    overflow: hidden;
    background: var(--grad-main);
}

.download::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 50% 60% at 20% 30%, rgba(255, 255, 255, 0.18), transparent 60%),
        radial-gradient(ellipse 50% 60% at 80% 70%, rgba(255, 255, 255, 0.12), transparent 60%);
}

.download-inner {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #fff;
}

.download-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.25), transparent 60%);
    z-index: -1;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: .6; }
    50%      { transform: translate(-50%, -50%) scale(1.12); opacity: .9; }
}

.download-logo {
    width: 88px;
    height: 88px;
    margin: 0 auto 24px;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.2);
    border: 3px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.download-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.download-desc {
    font-size: 1.1rem;
    opacity: .92;
    margin-bottom: 18px;
}

.download-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    opacity: .85;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.download-meta .dot {
    opacity: .6;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 20px 52px;
    border-radius: 60px;
    background: #fff;
    color: var(--rose);
    font-size: 1.2rem;
    font-weight: 800;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.25);
    transition: transform .3s cubic-bezier(.2,.8,.2,1), box-shadow .3s;
    position: relative;
    overflow: hidden;
}

.btn-download::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--grad-text);
    opacity: 0;
    transition: opacity .3s;
    z-index: 0;
}

.btn-download > * {
    position: relative;
    z-index: 1;
}

.btn-download:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: 0 28px 64px rgba(0, 0, 0, 0.35);
    color: #fff;
}

.btn-download:hover::before {
    opacity: 1;
}

.btn-download-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.download-tip {
    margin-top: 18px;
    font-size: 0.88rem;
    opacity: .8;
}

/* =========================================================
   页脚
   ========================================================= */
.footer {
    background: #1a0f24;
    color: rgba(255, 255, 255, 0.7);
    padding: 50px 0 36px;
}

.footer-inner {
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 18px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
}

.footer-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--grad-main);
}

.footer-info {
    font-size: 0.9rem;
    margin-bottom: 10px;
    opacity: .85;
}

.footer-copy {
    font-size: 0.82rem;
    opacity: .55;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 980px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions,
    .hero-meta {
        justify-content: center;
    }

    .shots {
        order: 1;
        height: 460px;
        max-width: 460px;
        margin: 0 auto;
    }

    .feature-grid,
    .review-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 720px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        width: 78%;
        max-width: 320px;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        background: rgba(255, 243, 246, 0.97);
        backdrop-filter: blur(20px);
        box-shadow: -20px 0 60px rgba(255, 92, 138, 0.20);
        transform: translateX(100%);
        transition: transform .4s cubic-bezier(.2,.8,.2,1);
        padding: 40px;
    }

    .nav-links.open {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 18px;
    }

    .nav-cta {
        width: 100%;
        justify-content: center;
        padding: 14px 24px;
    }

    .nav-toggle {
        display: flex;
        z-index: 101;
    }

    .section {
        padding: 70px 0;
    }

    .hero {
        padding: 110px 0 60px;
        min-height: auto;
    }

    .shots {
        height: 400px;
    }

    /* 小屏：扇形收拢，旋转角度减半、水平偏移减少，避免溢出屏幕 */
    .shot-3 {
        left: 0%;
        transform: rotate(-6deg) translateY(4%);
    }
    .shot-2 {
        transform: translateX(-50%) rotate(0deg) translateY(0);
    }
    .shot-1 {
        right: 0%;
        transform: rotate(6deg) translateY(4%);
    }

    .feature-grid,
    .review-grid {
        grid-template-columns: 1fr;
    }

    .hero-meta {
        gap: 16px;
        padding: 12px 20px;
    }

    .btn-download {
        padding: 18px 40px;
        font-size: 1.05rem;
    }
}

@media (max-width: 420px) {
    .container {
        padding: 0 18px;
    }

    .shots {
        height: 340px;
    }

    /* 超小屏：再收紧扇形，以点击切换为主 */
    .shot {
        height: 92%;
    }
    .shot-3 {
        left: -2%;
        transform: rotate(-4deg) translateY(5%);
    }
    .shot-1 {
        right: -2%;
        transform: rotate(4deg) translateY(5%);
    }
}

/* 滚动出现动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .7s ease, transform .7s ease;
}

.reveal.in {
    opacity: 1;
    transform: translateY(0);
}