/* ============================================================
   SafeW Windows 下载页面 - 独立样式表
   文件: static_safew/css/style.css
   说明: 包含全局变量、布局、下载区、步骤、FAQ 及响应式
   ============================================================ */

/* ---------- 全局变量 ---------- */
:root {
    --bg-base: #06010d;
    --accent-purple: #a855f7;
    --accent-blue: #3b82f6;
    --text-white: #ffffff;
    --text-gray: #b0aac2;
    --card-blend-bg: rgba(26, 12, 46, 0.3);
    --card-blend-border: rgba(168, 85, 247, 0.12);
    --gradient-main: linear-gradient(90deg, #a855f7 0%, #3b82f6 100%);
}

/* ---------- 全局重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
html {
    scroll-behavior: smooth;
}
body {
    background-color: var(--bg-base);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* ---------- 背景光晕 ---------- */
.neon-bg-glow {
    position: absolute;
    width: 900px;
    height: 900px;
    background: radial-gradient(circle, rgba(147, 51, 234, 0.45) 0%, rgba(59, 130, 246, 0.1) 45%, rgba(6, 1, 13, 0) 70%);
    pointer-events: none;
    z-index: 1;
    filter: blur(50px);
}
.glow-1 {
    top: -150px;
    right: -100px;
}
.glow-2 {
    top: 800px;
    left: -250px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.35) 0%, rgba(147, 51, 234, 0.2) 50%, rgba(6, 1, 13, 0) 70%);
}
.glow-3 {
    top: 1800px;
    right: -250px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.4) 0%, rgba(6, 1, 13, 0) 70%);
}

/* 保证内容在光晕之上 */
section,
header,
footer {
    position: relative;
    z-index: 2;
}

/* ---------- 头部 ---------- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 8%;
    background: rgba(6, 1, 13, 0.75);
    backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 9999;
    border-bottom: 1px solid rgba(168, 85, 247, 0.08);
    box-sizing: border-box;
}
.logo-img {
    height: 32px;
    display: block;
    cursor: pointer;
    z-index: 10;
}
.nav-wrapper {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
}
nav {
    display: flex;
    gap: 35px;
}
nav span {
    color: rgba(255, 255, 255, 0.65);
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s;
}
nav span:hover {
    color: var(--text-white);
}
nav .active {
    color: var(--text-white);
}

.lang-container {
    position: absolute;
    right: 8%;
    z-index: 10;
}
.lang-select {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}
.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: rgba(20, 10, 35, 0.95);
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 8px;
    width: 130px;
    padding: 6px 0;
    display: none;
    backdrop-filter: blur(10px);
}
.lang-container:hover .lang-dropdown {
    display: block;
}
.lang-dropdown a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
}
.lang-dropdown a:hover {
    background: rgba(168, 85, 247, 0.2);
    color: var(--text-white);
}

/* ---------- 主内容容器 ---------- */
.content-section {
    padding: 180px 8% 80px;
    max-width: 1200px;
    margin: 0 auto;
}
.section-title {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 16px;
    text-align: center;
}
.section-subtitle {
    font-size: 16px;
    color: var(--text-gray);
    text-align: center;
    margin-bottom: 50px;
}

/* ============================================================
   Windows 专用下载区域
   ============================================================ */
.windows-download-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--card-blend-bg);
    border: 1px solid var(--card-blend-border);
    border-radius: 32px;
    padding: 50px 40px 40px;
    backdrop-filter: blur(10px);
    margin-bottom: 40px;
    text-align: center;
}
.windows-download-area .big-icon {
    font-size: 72px;
    color: var(--accent-purple);
    margin-bottom: 16px;
    background: rgba(168, 85, 247, 0.08);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.windows-download-area h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}
.windows-download-area .version-tag {
    background: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: 30px;
    padding: 4px 18px;
    font-size: 13px;
    color: #c4b8dc;
    display: inline-block;
    margin-bottom: 20px;
}
.windows-download-area .desc {
    color: var(--text-gray);
    font-size: 15px;
    max-width: 500px;
    margin-bottom: 28px;
}

/* 主下载按钮 */
.download-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(135deg, #a855f7, #3b82f6);
    color: #fff;
    padding: 16px 44px;
    border-radius: 60px;
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 8px 30px rgba(147, 51, 234, 0.3);
}
.download-btn-primary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(147, 51, 234, 0.5);
    filter: brightness(1.05);
}
.download-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}
.download-btn-primary i {
    font-size: 22px;
}

/* 系统信息网格 */
.win-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 30px;
    width: 100%;
    max-width: 700px;
}
.win-info-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(168, 85, 247, 0.08);
    border-radius: 14px;
    padding: 14px 10px;
    font-size: 13px;
    color: var(--text-gray);
}
.win-info-item strong {
    color: #e0d8f0;
    display: block;
    font-size: 14px;
}

/* ============================================================
   特色区域 (Feature Banner)
   ============================================================ */
.feature-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 60px;
    padding-top: 60px;
    border-top: 1px solid rgba(168, 85, 247, 0.08);
}
.feature-banner-item {
    background: var(--card-blend-bg);
    border: 1px solid var(--card-blend-border);
    border-radius: 16px;
    padding: 36px 32px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: 0.3s;
}
.feature-banner-item:hover {
    border-color: rgba(168, 85, 247, 0.35);
}
.feature-banner-item .icon {
    font-size: 28px;
    color: var(--accent-purple);
    flex-shrink: 0;
    margin-top: 4px;
}
.feature-banner-item h4 {
    font-size: 17px;
    margin-bottom: 8px;
}
.feature-banner-item p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ============================================================
   安装步骤 & 使用步骤
   ============================================================ */
.steps-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px 60px;
    margin-top: 20px;
}
.step-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    background: var(--card-blend-bg);
    border: 1px solid var(--card-blend-border);
    border-radius: 14px;
    padding: 24px 28px;
    transition: 0.3s;
}
.step-item:hover {
    border-color: rgba(168, 85, 247, 0.3);
}
.step-num {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(59, 130, 246, 0.2));
    border: 1px solid rgba(168, 85, 247, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    color: var(--accent-purple);
}
.step-content h4 {
    font-size: 16px;
    margin-bottom: 4px;
}
.step-content p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ============================================================
   FAQ 折叠区
   ============================================================ */
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px 30px;
    margin-top: 20px;
}
.faq-item {
    background: var(--card-blend-bg);
    border: 1px solid var(--card-blend-border);
    border-radius: 14px;
    padding: 20px 26px;
    transition: 0.3s;
    cursor: pointer;
}
.faq-item:hover {
    border-color: rgba(168, 85, 247, 0.35);
    background: rgba(26, 12, 46, 0.5);
}
.faq-item .q {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 15px;
    color: #f0ecfc;
}
.faq-item .q i {
    color: var(--accent-purple);
    font-size: 14px;
    flex-shrink: 0;
}
.faq-item .a {
    margin-top: 8px;
    padding-left: 28px;
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.7;
    display: none;
}
.faq-item.open .a {
    display: block;
}
.faq-item .toggle-icon {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-gray);
    transition: transform 0.3s;
}
.faq-item.open .toggle-icon {
    transform: rotate(180deg);
}

/* ============================================================
   页脚
   ============================================================ */
.footer-new {
    background: #030008;
    padding: 60px 8% 30px 8%;
    border-top: 1px solid rgba(168, 85, 247, 0.08);
    color: #7a6f94;
    font-size: 13px;
}
.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(168, 85, 247, 0.06);
}
.footer-brand .logo {
    font-weight: 700;
    font-size: 22px;
    letter-spacing: 2px;
    background: linear-gradient(130deg, #a78bfa, #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    margin-bottom: 12px;
}
.footer-brand p {
    color: #7a6f94;
    font-size: 13px;
    line-height: 1.7;
    max-width: 300px;
    margin-bottom: 20px;
}
.social-icons {
    display: flex;
    gap: 14px;
}
.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(168, 85, 247, 0.08);
    border: 1px solid rgba(168, 85, 247, 0.12);
    color: #8a7aa8;
    transition: all 0.25s;
    text-decoration: none;
    font-size: 14px;
}
.social-icons a:hover {
    background: rgba(168, 85, 247, 0.2);
    border-color: rgba(168, 85, 247, 0.4);
    color: #fff;
    transform: translateY(-2px);
}
.footer-col h4 {
    color: #f0ecfc;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 16px;
    letter-spacing: 0.3px;
}
.footer-col ul {
    list-style: none;
}
.footer-col ul li {
    margin-bottom: 10px;
}
.footer-col ul li a {
    color: #7a6f94;
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}
.footer-col ul li a:hover {
    color: #e0d8f0;
}
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    font-size: 12px;
    color: #5b4e72;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-bottom-links {
    display: flex;
    gap: 24px;
}
.footer-bottom-links a {
    color: #5b4e72;
    text-decoration: none;
    transition: color 0.2s;
    font-size: 12px;
}
.footer-bottom-links a:hover {
    color: #b0aac2;
}

/* ============================================================
   响应式设计
   ============================================================ */
@media (max-width: 1024px) {
    header {
        padding: 15px 5%;
    }
    .nav-wrapper {
        position: static;
        transform: none;
    }
    nav {
        display: none;
    }
    .lang-container {
        position: static;
    }
    .feature-banner {
        grid-template-columns: 1fr;
    }
    .steps-grid {
        grid-template-columns: 1fr;
    }
    .faq-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
    .footer-brand p {
        max-width: 100%;
    }
    .win-info-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 600px) {
    .section-title {
        font-size: 26px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .footer-bottom-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    .content-section {
        padding: 140px 5% 60px;
    }
    .step-item {
        padding: 18px 20px;
    }
    .faq-item {
        padding: 16px 20px;
    }
    .windows-download-area {
        padding: 30px 20px;
    }
    .win-info-grid {
        grid-template-columns: 1fr;
    }
    .download-btn-primary {
        padding: 14px 30px;
        font-size: 16px;
    }
}