/* ========================================
   和存在感薄弱的妹妹一起的简单生活 - 样式表
   日式轻小说风格设计
   主色调：淡粉色+白色+温馨色调
   ======================================== */

/* 自定义字体加载 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

/* CSS变量定义 */
:root {
    /* 主色调 - 淡粉色系 */
    --primary-color: #FFB3BA;
    --primary-light: #FFE4E6;
    --primary-dark: #FF8A95;
    
    /* 辅助色调 - 日式温馨色 */
    --secondary-color: #F5F5DC;  /* 米白色 */
    --accent-color: #FDF5E6;     /* 白橡木色 */
    --warm-yellow: #FFF8DC;      /* 米黄色 */
    
    /* 中性色 */
    --white: #FFFFFF;
    --light-gray: #F8F9FA;
    --gray: #6C757D;
    --dark-gray: #495057;
    --black: #212529;
    
    /* 阴影和边框 */
    --shadow-light: 0 2px 10px rgba(255, 179, 186, 0.1);
    --shadow-medium: 0 4px 20px rgba(255, 179, 186, 0.15);
    --shadow-heavy: 0 8px 30px rgba(255, 179, 186, 0.2);
    --border-radius: 12px;
    --border-radius-small: 8px;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* 动画 */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--dark-gray);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--white) 50%, var(--accent-color) 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
    padding: 1rem 0;
    transition: var(--transition);
    border-bottom: 1px solid var(--primary-light);
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--primary-dark) !important;
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-small);
    margin-right: 0.75rem;
    object-fit: cover;
    box-shadow: var(--shadow-light);
}

.navbar-nav .nav-link {
    color: var(--dark-gray) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    margin: 0 0.25rem;
    border-radius: var(--border-radius-small);
    transition: var(--transition);
    position: relative;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-dark) !important;
    background: var(--primary-light);
    transform: translateY(-2px);
}

/* 英雄区域样式 */
.hero-section {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--white) 100%);
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="%23FFB3BA" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%23FFB3BA" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="%23FFB3BA" opacity="0.1"/><circle cx="10" cy="50" r="0.5" fill="%23FFB3BA" opacity="0.1"/><circle cx="90" cy="50" r="0.5" fill="%23FFB3BA" opacity="0.1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 2rem 0;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(255, 179, 186, 0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--dark-gray);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-buttons .btn {
    padding: 0.875rem 2rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    border: none;
    color: var(--white);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
    background: linear-gradient(45deg, var(--primary-dark), var(--primary-color));
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-dark);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.hero-image {
    position: relative;
    z-index: 2;
}

.hero-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    transition: var(--transition);
}

.hero-image img:hover {
    transform: scale(1.02);
    box-shadow: 0 12px 40px rgba(255, 179, 186, 0.25);
}

/* 通用区块样式 */
.section-padding {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray);
    margin-bottom: 2rem;
}

/* 内容区块样式 */
.content-block {
    padding: 2rem 0;
}

.content-block .lead {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--dark-gray);
    margin-bottom: 2rem;
}

.feature-list {
    list-style: none;
}

.feature-item {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--white);
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-medium);
}

.feature-item i {
    font-size: 1.25rem;
    margin-right: 1rem;
    width: 24px;
    text-align: center;
}

/* 特色功能样式 */
.feature-content {
    padding: 2rem 0;
}

.feature-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
}

.feature-title i {
    font-size: 1.5rem;
}

/* 亮点卡片样式 */
.highlight-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    height: 100%;
    transition: var(--transition);
    border: 1px solid var(--primary-light);
}

.highlight-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.highlight-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--white);
    font-size: 1.5rem;
}

.highlight-card h4 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.highlight-card p {
    color: var(--dark-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* 截图画廊样式 */
.screenshot-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
}

.screenshot-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-heavy);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    transition: var(--transition);
    cursor: pointer;
}

.screenshot-item:hover img {
    filter: brightness(1.1);
}

/* 更新日志样式 */
.update-log {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--primary-light);
}

.update-item {
    margin-bottom: 2rem;
}

.update-date {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-small);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.update-version {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.update-list {
    list-style: none;
    padding-left: 0;
}

.update-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--dark-gray);
}

.update-list li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* FAQ手风琴样式 */
.accordion-item {
    border: 1px solid var(--primary-light);
    margin-bottom: 1rem;
    border-radius: var(--border-radius) !important;
    overflow: hidden;
}

.accordion-button {
    background: var(--white);
    border: none;
    color: var(--dark-gray);
    font-weight: 500;
    padding: 1.25rem;
    text-align: left;
}

.accordion-button:not(.collapsed) {
    background: var(--primary-light);
    color: var(--primary-dark);
    box-shadow: none;
}

.accordion-button::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23FFB3BA'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
}

.accordion-body {
    background: var(--white);
    padding: 1.25rem;
    color: var(--dark-gray);
    line-height: 1.6;
}

/* 页脚样式 */
.footer {
    background: linear-gradient(135deg, var(--dark-gray) 0%, var(--black) 100%);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 5rem;
}

.footer h5, .footer h6 {
    color: var(--primary-light);
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--light-gray);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
    transform: translateX(5px);
    display: inline-block;
}

.footer-divider {
    border-color: var(--gray);
    margin: 2rem 0 1rem;
}

.footer-copyright {
    color: var(--light-gray);
    font-size: 0.875rem;
    margin: 0;
}

.seo-tools a {
    font-size: 0.75rem;
    text-decoration: none;
    transition: var(--transition);
}

.seo-tools a:hover {
    color: var(--primary-light) !important;
}

/* 模态框样式 */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
}

.modal-header {
    border-bottom: 1px solid var(--primary-light);
    background: var(--primary-light);
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-dark);
    opacity: 0.7;
}

.btn-close:hover {
    opacity: 1;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

/* 背景装饰样式 */
.bg-light {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--white) 50%, var(--secondary-color) 100%) !important;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.25rem;
    }
}

@media (max-width: 992px) {
    .hero-section {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-padding {
        padding: 4rem 0;
    }
    
    .hero-buttons {
        text-align: center;
        margin-top: 2rem;
    }
    
    .hero-buttons .btn {
        display: block;
        margin: 0.5rem 0;
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 1.875rem;
    }
    
    .section-padding {
        padding: 3rem 0;
    }
    
    .highlight-card {
        padding: 1.5rem;
        margin-bottom: 2rem;
    }
    
    .navbar-brand {
        font-size: 1rem;
    }
    
    .logo-img {
        width: 35px;
        height: 35px;
    }
}

@media (max-width: 576px) {
    :root {
        --font-size-base: 14px;
    }
    
    .hero-section {
        padding: 80px 0 40px;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-padding {
        padding: 2rem 0;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

/* 滚动动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* 特殊效果 */
.hero-image img {
    animation: pulse 4s infinite;
}

/* 加载优化 */
img {
    loading: lazy;
}

/* 打印样式 */
@media print {
    .navbar,
    .back-to-top,
    .hero-buttons {
        display: none !important;
    }
    
    body {
        background: white !important;
    }
    
    .section-padding {
        padding: 1rem 0 !important;
    }
}