:root {
    --primary-color: #333333;
    --accent-color: #B22222; /* 朱砂红 */
    --gold-color: #DAA520;
    --bg-color: #F4F1EA; /* 宣纸色 */
    --text-main: #2C2C2C;
    --text-secondary: #666666;
    --font-serif: 'Noto Serif SC', serif;
}

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

body {
    font-family: var(--font-serif);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

ul {
    list-style: none;
}

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

/* 导航栏 */
.navbar {
    padding: 20px 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(244, 241, 234, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    margin-right: 10px;
    font-size: 28px;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    font-size: 16px;
    color: var(--text-main);
}

.nav-links a:hover {
    color: var(--accent-color);
}

.btn-download-nav {
    border: 1px solid var(--primary-color);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
}

.btn-download-nav:hover {
    background-color: var(--primary-color);
    color: #fff;
}

/* Hero 区域 */
.hero {
    padding-top: 140px;
    padding-bottom: 80px;
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.ink-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 80% 20%, rgba(0,0,0,0.03) 0%, transparent 40%),
                radial-gradient(circle at 20% 80%, rgba(178, 34, 34, 0.03) 0%, transparent 30%);
    z-index: -1;
    pointer-events: none;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.hero-text {
    flex: 1;
    padding-right: 50px;
}

.sub-headline {
    font-size: 20px;
    color: var(--accent-color);
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.headline {
    font-size: 64px;
    line-height: 1.2;
    margin-bottom: 30px;
    font-weight: 700;
}

.description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    background-color: var(--primary-color);
    color: #fff;
    padding: 15px 35px;
    border-radius: 30px;
    font-size: 18px;
    gap: 10px;
    transition: transform 0.2s, background-color 0.3s;
}

.btn-primary:hover {
    background-color: #000;
    transform: translateY(-2px);
}

.poetic-line {
    margin-top: 40px;
    font-size: 14px;
    color: #999;
    letter-spacing: 4px;
    font-style: italic;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

/* 手机 Mockup */
.phone-frame {
    width: 320px;
    height: 650px;
    background-color: #1a1a1a;
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    position: relative;
}

.screen {
    width: 100%;
    height: 100%;
    background-color: #F4F1EA;
    border-radius: 30px;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* App UI (High Fidelity) */
.app-ui {
    width: 100%;
    height: 100%;
    background-color: #F4F1EA;
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 0 20px;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
}

/* 状态栏 */
.status-bar {
    height: 44px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
    font-size: 14px;
    font-weight: 600;
    color: #000;
}
.status-icons {
    display: flex;
    gap: 5px;
    font-size: 12px;
}

/* 顶部 Header */
.app-header-real {
    margin-top: 10px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

.avatar-group {
    position: relative;
}
.avatar {
    width: 40px;
    height: 40px;
    background: #E0E0E0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #333;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: #FFD700;
    color: #000;
    font-size: 10px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #fff;
    font-weight: bold;
}

.header-title {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.header-title .main {
    font-size: 18px;
    font-weight: bold;
    color: #1a1a1a;
}
.header-title .sub {
    font-size: 10px;
    color: #999;
    margin-top: 2px;
}

.header-pill {
    background: #fff;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid rgba(0,0,0,0.05);
}

/* 主标题 */
.main-heading {
    text-align: center;
    margin: 20px 0;
}
.main-heading h1 {
    font-size: 24px;
    font-weight: 800;
    color: #2C2C2C;
    letter-spacing: 1px;
}

/* 数据 Pills */
.stats-pills {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}
.pill {
    background: #fff;
    padding: 6px 10px;
    border-radius: 15px;
    font-size: 10px;
    color: #333;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
}

/* 卡片区域 */
.cards-container {
    position: relative;
    padding: 0 10px;
}
.card-row {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}
.app-card {
    flex: 1;
    background: #fff;
    height: 110px;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
    position: relative;
}
.card-icon {
    font-size: 24px;
    margin-bottom: 8px;
    color: #333;
}
.card-title {
    font-size: 16px;
    font-weight: bold;
    color: #1a1a1a;
    margin-bottom: 4px;
}
.card-sub {
    font-size: 10px;
    color: #ccc;
    font-weight: 300;
}

/* 中央按钮 */
.center-circle-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    z-index: 10;
}
.circle-inner {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #8B7355, #6d5a43); /* 棕金色 */
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 10px 20px rgba(139, 115, 85, 0.4);
    border: 3px solid rgba(255,255,255,0.8);
}
.circle-inner .text {
    font-size: 14px;
    font-weight: bold;
    margin-top: 2px;
}
.circle-inner .icon {
    font-size: 12px;
    opacity: 0.8;
}

/* 底部区域 */
.bottom-area {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding-bottom: 20px;
    overflow: hidden;
}

.bottom-text {
    font-size: 12px;
    color: #999;
    letter-spacing: 4px;
    margin-bottom: 20px;
    z-index: 5;
}

.bottom-mountain {
    position: absolute;
    bottom: -40px;
    width: 120%;
    height: 100px;
    background: linear-gradient(to top, #2C3E50, transparent);
    border-radius: 50% 50% 0 0;
    opacity: 0.8;
    filter: blur(20px);
}

.fish-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    bottom: 0;
}
/* 复用之前的鱼样式，但微调颜色 */
.fish {
    background: #FF7F50;
    width: 30px;
    height: 12px;
}
.fish::after {
    background: #FF7F50;
}

/* Features */
.features {
    padding: 100px 0;
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background-color: var(--accent-color);
    margin: 15px auto 0;
}

/* 灵龟守护特色展示 */
.turtle-feature {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
    margin-bottom: 80px;
    background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.4));
    padding: 40px;
    border-radius: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    border: 1px solid rgba(255,255,255,0.6);
}

.turtle-visual {
    width: 120px;
    height: 120px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.turtle-shape {
    position: relative;
    width: 80px;
    height: 100px;
    z-index: 2;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.shell {
    width: 70px;
    height: 80px;
    background: #4A5D4F; /* 深墨绿 */
    border-radius: 50%;
    position: absolute;
    top: 10px;
    left: 5px;
    z-index: 2;
    box-shadow: inset -5px -5px 10px rgba(0,0,0,0.3);
}

.shell-pattern {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 60px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 40%;
}

.head {
    width: 25px;
    height: 30px;
    background: #6B8E23;
    border-radius: 50%;
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.leg {
    width: 20px;
    height: 25px;
    background: #6B8E23;
    border-radius: 50%;
    position: absolute;
    z-index: 1;
}

.leg-fl { top: 10px; left: -5px; transform: rotate(-45deg); }
.leg-fr { top: 10px; right: -5px; transform: rotate(45deg); }
.leg-bl { bottom: 5px; left: 0; transform: rotate(45deg); }
.leg-br { bottom: 5px; right: 0; transform: rotate(-45deg); }

.tail {
    width: 10px;
    height: 15px;
    background: #6B8E23;
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    clip-path: polygon(50% 100%, 0 0, 100% 0);
    z-index: 1;
}

.turtle-aura {
    position: absolute;
    width: 140px;
    height: 140px;
    background: radial-gradient(circle, rgba(107, 142, 35, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

.turtle-desc {
    flex: 1;
}

.turtle-desc h3 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.turtle-desc .subtitle {
    font-size: 16px;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.turtle-desc .text {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 30px;
    border-radius: 20px;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card .icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Philosophy */
.philosophy {
    padding: 120px 0;
    background-color: var(--bg-color);
    position: relative;
    overflow: hidden;
}

.philosophy-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 80px;
}

.vertical-text {
    writing-mode: vertical-rl;
    font-size: 24px;
    color: rgba(0,0,0,0.1);
    font-weight: 700;
    letter-spacing: 10px;
    height: 300px;
    line-height: 2;
}

.main-desc {
    max-width: 500px;
}

.main-desc h2 {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.stats {
    display: flex;
    gap: 50px;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-item .number {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-item .label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Download */
.download-section {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(rgba(244, 241, 234, 0.9), rgba(244, 241, 234, 0.9)), 
                url('assets/images/texture.png'); /* 假设有纹理 */
}

.download-section h2 {
    font-size: 42px;
    margin-bottom: 20px;
}

.download-section p {
    font-size: 18px;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.btn-primary.large {
    padding: 18px 50px;
    font-size: 20px;
}

/* Footer */
footer {
    padding: 40px 0;
    background-color: #2C2C2C;
    color: rgba(255,255,255,0.6);
    font-size: 14px;
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a:hover {
    color: #fff;
}

/* 响应式适配 */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text {
        padding-right: 0;
        margin-bottom: 60px;
    }

    .headline {
        font-size: 42px;
    }

    .philosophy-content {
        flex-direction: column;
        gap: 40px;
    }

    .vertical-text {
        writing-mode: horizontal-tb;
        height: auto;
        margin-bottom: 20px;
    }
    
    footer .container {
        flex-direction: column;
        gap: 20px;
    }
    
    .turtle-feature {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }
}