/* ===== 基础重置与变量 ===== */
:root {
    --color-primary: #A63C22;
    --color-primary-dark: #843018;
    --color-accent: #D9A047;
    --color-accent-light: #F3D69A;
    --color-bg: #FFF8F3;
    --color-bg-warm: #FFEEE4;
    --color-text: #3D2B24;
    --color-text-light: #6D5950;
    --color-white: #FFFFFF;
    --radius: 18px;
    --radius-sm: 12px;
    --shadow: 0 8px 24px rgba(61, 43, 36, 0.10);
    --shadow-hover: 0 12px 32px rgba(61, 43, 36, 0.16);
    --max-width: 1100px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    text-align: center;
}

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

img {
    max-width: 100%;
    height: auto;
}

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

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    border-radius: 50px;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
    cursor: pointer;
    border: none;
}

.btn-large {
    min-height: 64px;
    padding: 16px 48px;
    font-size: 1.15rem;
}

.btn-block {
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    box-shadow: 0 6px 18px rgba(166, 60, 34, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 26px rgba(166, 60, 34, 0.45);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 3px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-bg-warm);
}

/* ===== 顶部导航 ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 248, 243, 0.96);
    backdrop-filter: blur(8px);
    border-bottom: 2px solid var(--color-bg-warm);
    padding: 16px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--color-primary);
}

.logo img {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    object-fit: cover;
}

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

.nav a {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    padding: 10px 18px;
    border-radius: 50px;
    transition: background-color 0.2s, color 0.2s;
}

.nav a:hover {
    background-color: var(--color-bg-warm);
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    font-size: 1.8rem;
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
}

/* ===== Hero 区 ===== */
.hero {
    padding: 80px 0 100px;
    background: linear-gradient(180deg, var(--color-bg-warm) 0%, var(--color-bg) 100%);
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
}

.hero-text {
    flex: 1 1 480px;
    text-align: left;
}

.hero-text h1 {
    font-size: 3.2rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-light);
    margin-bottom: 16px;
    font-weight: 600;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--color-accent);
    font-weight: 700;
    margin-bottom: 36px;
    letter-spacing: 1px;
}

.hero-actions {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-visual {
    flex: 0 0 360px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-logo {
    width: 320px;
    height: 320px;
    border-radius: 48px;
    box-shadow: var(--shadow);
    background-color: var(--color-white);
    padding: 24px;
}

/* ===== 通用标题 ===== */
.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-light);
    margin-bottom: 48px;
}

/* ===== 下载区 ===== */
.download {
    padding: 80px 0;
    background-color: var(--color-white);
}

.download-cards {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 40px;
    flex-wrap: wrap;
}

.download-card {
    flex: 1 1 380px;
    max-width: 460px;
    background-color: var(--color-bg);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

.qr-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.qr-code {
    width: 240px;
    height: 240px;
    border-radius: var(--radius-sm);
    background-color: var(--color-white);
    padding: 12px;
    margin-bottom: 20px;
}

.qr-tip {
    font-size: 1.1rem;
    color: var(--color-text-light);
    font-weight: 600;
}

.info-card {
    text-align: left;
    display: flex;
    flex-direction: column;
}

.app-info {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
}

.app-icon {
    width: 88px;
    height: 88px;
    border-radius: 22px;
    object-fit: cover;
}

.app-info h3 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.version {
    font-size: 1rem;
    color: var(--color-text-light);
}

.app-meta {
    list-style: none;
    margin-bottom: 32px;
}

.app-meta li {
    font-size: 1.05rem;
    color: var(--color-text);
    padding: 10px 0;
    border-bottom: 1px dashed var(--color-accent-light);
}

.download-note {
    margin-top: 16px;
    font-size: 0.95rem;
    color: var(--color-text-light);
    text-align: center;
}

/* ===== 功能介绍 ===== */
.features {
    padding: 80px 0;
    background-color: var(--color-bg-warm);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.feature-card {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 36px 28px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.4rem;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 1.05rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== 公司简介 ===== */
.company {
    padding: 80px 0;
    background-color: var(--color-bg);
}

.company-card {
    max-width: 880px;
    margin: 0 auto;
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 48px;
    box-shadow: var(--shadow);
    text-align: left;
}

.company-card h3 {
    font-size: 1.6rem;
    color: var(--color-primary);
    margin-bottom: 24px;
    text-align: center;
}

.company-card p {
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: 20px;
    line-height: 1.9;
}

.company-contact {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 2px solid var(--color-bg-warm);
}

.company-contact p {
    margin-bottom: 10px;
    font-size: 1.05rem;
}

.company-contact strong {
    color: var(--color-primary);
}

/* ===== 底部 ===== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 40px 0;
}

.copyright {
    font-size: 1rem;
    margin-bottom: 12px;
    opacity: 0.95;
}

.footer-links {
    font-size: 1rem;
    opacity: 0.9;
}

.footer-links a {
    margin: 0 12px;
    text-decoration: underline;
    text-underline-offset: 4px;
}

.footer-links span {
    opacity: 0.6;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    html {
        font-size: 18px;
    }

    .nav-toggle {
        display: block;
    }

    .nav {
        display: none;
        position: absolute;
        top: 92px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        gap: 0;
        padding: 12px 24px;
        box-shadow: var(--shadow);
        border-top: 2px solid var(--color-bg-warm);
    }

    .nav.open {
        display: flex;
    }

    .nav a {
        padding: 16px;
        border-bottom: 1px solid var(--color-bg-warm);
        border-radius: 0;
    }

    .hero {
        padding: 48px 0 64px;
    }

    .hero-inner {
        flex-direction: column-reverse;
        text-align: center;
    }

    .hero-text {
        text-align: center;
    }

    .hero-text h1 {
        font-size: 2.4rem;
    }

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

    .hero-logo {
        width: 220px;
        height: 220px;
        border-radius: 36px;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .download-cards {
        flex-direction: column;
        align-items: center;
    }

    .download-card {
        width: 100%;
        padding: 28px;
    }

    .company-card {
        padding: 28px;
    }
}