/* =========================================================
   九天传奇官网 - 通用样式 common.css
   配色规范：
   主色调（湖蓝）#1098AD / 辅助色（墨绿）#1F4E3D / 点缀色（红）#E53935
   基础色（白）#FFFFFF / 中性色（橙）#FF8C42
   ========================================================= */

:root {
    /* 主色调 - 湖蓝色 */
    --color-primary: #1098AD;
    --color-primary-dark: #0B7A8C;
    --color-primary-light: #4FB8C9;
    --color-primary-soft: #E6F6F8;

    /* 辅助色 - 墨绿色 */
    --color-secondary: #1F4E3D;
    --color-secondary-dark: #143729;
    --color-secondary-light: #3A6E5A;

    /* 点缀色 - 红色 */
    --color-accent: #E53935;
    --color-accent-dark: #B71C1C;
    --color-accent-light: #FF6B68;

    /* 基础色 - 白 / 灰 */
    --color-white: #FFFFFF;
    --color-bg: #F7FAFB;
    --color-text: #2C3E50;
    --color-text-light: #5A6E7F;
    --color-border: #E1E8ED;
    --color-shadow: rgba(16, 152, 173, 0.12);

    /* 中性色 - 橙 */
    --color-orange: #FF8C42;
    --color-orange-light: #FFB07A;

    /* 尺寸 / 字体 */
    --header-h: 70px;
    --container-w: 1200px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 14px;
    --shadow-sm: 0 2px 8px var(--color-shadow);
    --shadow-md: 0 6px 20px rgba(16, 152, 173, 0.18);
    --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.12);
    --transition: all .3s ease;
}

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

html, body { height: 100%; }
body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========== 关键修复：让所有主内容区域自动填充剩余空间 ========== */
/* 方式一：匹配所有以 -main 结尾的 class */
[class*="-main"] {
    flex: 1;
}

/* 方式二：同时匹配 main 标签，双重保险 */
main {
    flex: 1;
}

a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; outline: none; }

.container {
    width: 100%;
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    user-select: none;
    white-space: nowrap;
}
/* 重要按钮：主色填充 + 红色描边 */
.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-accent);
    box-shadow: 0 4px 14px rgba(229, 57, 53, 0.25);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(229, 57, 53, 0.35);
}
/* 普通按钮：辅助色填充 + 主色描边 */
.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-white);
    border-color: var(--color-primary);
}
.btn-secondary:hover {
    background: var(--color-secondary-dark);
    transform: translateY(-2px);
}
/* 镂空按钮 */
.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}
.btn-lg { padding: 16px 40px; font-size: 17px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- 导航栏 ---------- */
.navbar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-h);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    z-index: 1000;
    box-shadow: 0 2px 16px rgba(11, 122, 140, 0.25);
}
.nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-white);
}
.nav-logo img { width: 38px; height: 38px; border-radius: 8px; background: #fff; padding: 3px; }
.nav-logo span { letter-spacing: 1px; }
.nav-logo small {
    font-size: 11px;
    background: var(--color-accent);
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 400;
    margin-left: 4px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-menu a {
    position: relative;
    color: rgba(255, 255, 255, 0.92);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: var(--transition);
}
.nav-menu a:hover { background: rgba(255, 255, 255, 0.15); color: #fff; }
.nav-menu a.active {
    background: var(--color-white);
    color: var(--color-primary);
    font-weight: 600;
}
.nav-menu a.nav-cta {
    background: var(--color-accent);
    color: #fff;
    margin-left: 8px;
    padding: 8px 18px;
}
.nav-menu a.nav-cta:hover { background: var(--color-accent-dark); }

.nav-toggle {
    display: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
}

/* ---------- 悬浮立即下载按钮 ---------- */
.float-download {
    position: fixed;
    right: 24px;
    bottom: 80px;
    z-index: 998;
    background: var(--color-primary);
    color: #fff;
    border: 2px solid var(--color-accent);
    padding: 14px 18px;
    border-radius: 50px;
    box-shadow: 0 8px 24px rgba(229, 57, 53, 0.35);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    animation: pulse 2s infinite;
}
.float-download:hover {
    background: var(--color-primary-dark);
    transform: scale(1.06);
}
.float-download i { font-size: 18px; }
@keyframes pulse {
    0%, 100% { box-shadow: 0 8px 24px rgba(229, 57, 53, 0.35); }
    50% { box-shadow: 0 10px 32px rgba(229, 57, 53, 0.55); }
}

/* ---------- Footer ---------- */
.footer {
    background: linear-gradient(180deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
    color: rgba(255,255,255,0.85);
    padding: 50px 0 0;
    margin-top: 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 36px;
}
.footer-brand .footer-logo {
    display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
}
.footer-brand .footer-logo img { width: 44px; height: 44px; border-radius: 8px; background:#fff; padding:4px; }
.footer-brand .footer-logo b { font-size: 20px; color: #fff; letter-spacing: 1px; }
.footer-brand p { font-size: 13px; line-height: 1.8; color: rgba(255,255,255,0.7); }
.footer-brand .footer-health {
    margin-top: 14px;
    background: rgba(255,255,255,0.06);
    border-left: 3px solid var(--color-orange);
    padding: 10px 12px;
    border-radius: 4px;
    font-size: 12px;
    color: rgba(255,255,255,0.75);
}
.footer h4 {
    color: #fff;
    font-size: 15px;
    margin-bottom: 18px;
    position: relative;
    padding-bottom: 8px;
}
.footer h4::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 28px; height: 2px;
    background: var(--color-primary-light);
}
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255,255,255,0.7); font-size: 13px; transition: var(--transition); }
.footer-links a:hover { color: var(--color-primary-light); padding-left: 4px; }

.footer-contact p {
    font-size: 13px;
    color: rgba(255,255,255,0.75);
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.footer-contact i { color: var(--color-primary-light); margin-top: 4px; }

.footer-download .btn {
    margin-bottom: 12px;
    width: 100%;
}
/* footer 下载按钮：点缀色填充+主色描边（题目要求） */
.btn-footer-dl {
    background: var(--color-accent);
    color: #fff;
    border: 2px solid var(--color-primary);
}
.btn-footer-dl:hover { background: var(--color-accent-dark); transform: translateY(-2px); }

.footer-health-img {
    margin-top: 12px;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.15);
}
.footer-health-img img { width: 100%; }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.12);
    padding: 18px 0;
    text-align: center;
    font-size: 12px;
    color: rgba(255,255,255,0.55);
}
.footer-bottom a { color: rgba(255,255,255,0.7); }
.footer-bottom a:hover { color: var(--color-primary-light); text-decoration: underline; }
.footer-bottom .sep { margin: 0 8px; color: rgba(255,255,255,0.3); }

/* ---------- Toast 提示 ---------- */
.toast {
    position: fixed;
    top: 90px; left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: var(--color-secondary);
    color: #fff;
    padding: 12px 22px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    z-index: 9999;
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transition: all .35s ease;
    border-left: 4px solid var(--color-accent);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { border-left-color: #34a853; }
.toast.error   { border-left-color: var(--color-accent); }
.toast.info    { border-left-color: var(--color-primary); }

/* ---------- 通用区块 ---------- */
.section { padding: 70px 0; }
.section-title {
    text-align: center;
    margin-bottom: 50px;
}
.section-title h2 {
    font-size: 32px;
    color: var(--color-primary);
    position: relative;
    display: inline-block;
    padding-bottom: 12px;
    letter-spacing: 2px;
}
.section-title h2::after {
    content: "";
    position: absolute;
    left: 50%; bottom: 0;
    transform: translateX(-50%);
    width: 60px; height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
}
.section-title p {
    margin-top: 12px;
    color: var(--color-text-light);
    font-size: 15px;
}

/* ---------- 返回顶部按钮 ---------- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 997;
    box-shadow: var(--shadow-md);
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 768px) {
    :root { --header-h: 60px; }
    .nav-toggle { display: block; }
    .nav-menu {
        position: absolute;
        top: var(--header-h);
        left: 0; right: 0;
        background: var(--color-primary-dark);
        flex-direction: column;
        align-items: stretch;
        padding: 10px 16px 18px;
        transform: translateY(-110%);
        transition: transform .35s ease;
        max-height: calc(100vh - var(--header-h));
        overflow-y: auto;
    }
    .nav-menu.open { transform: translateY(0); }
    .nav-menu a { padding: 12px 14px; border-radius: 6px; }
    .nav-menu a.nav-cta { margin-left: 0; margin-top: 6px; text-align: center; }
    .float-download { right: 16px; bottom: 16px; padding: 10px 14px; font-size: 13px; }
    .section { padding: 50px 0; }
    .section-title h2 { font-size: 24px; }
    .footer-grid { grid-template-columns: 1fr; gap: 26px; }
    .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 16px; }
}