/* ============================================================
   小蝌蚪跨境ERP · 公共样式
   三页（index.html / 1.html / 2.html）共用的基础视觉与组件样式。
   修改全局主题（颜色、字体、公共组件）只需改这里。
   ============================================================ */

:root{
    --primary: #E33535;
    --primary-dark: #B91C1C;
    --secondary: #FF6B4A;
    --dark: #0A0F1A;
    --gray-deep: #0F1625;
    --gray-card: #121A2C;
    --gray-border: #1E2A3A;
}

/* 全局基础 */
body{
    background: linear-gradient(145deg, #0A0F1A 0%, #0F1625 100%);
    font-family: 'Inter', system-ui, sans-serif;
    color: #E6EDF5;
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

/* 卡片 */
.card-dark{
    background: rgba(18, 26, 44, 0.95);
    backdrop-filter: blur(2px);
    border: 1px solid rgba(30, 42, 58, 0.6);
    border-radius: 1.5rem;
    transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    box-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.3);
    cursor: pointer;
}
.card-dark:hover{
    transform: translateY(-6px);
    border-color: rgba(227, 53, 53, 0.55);
    box-shadow: 0 20px 32px -12px rgba(227, 53, 53, 0.2);
}

/* 按钮 */
.btn-primary{
    background: linear-gradient(95deg, #E33535 0%, #B91C1C 100%);
    box-shadow: 0 4px 12px rgba(227, 53, 53, 0.3);
    transition: all 0.25s ease;
    border: none;
}
.btn-primary:hover{
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(227, 53, 53, 0.45);
    filter: brightness(1.02);
}
.btn-outline-primary{
    border: 1px solid #E33535;
    color: #E33535;
    background: transparent;
    transition: all 0.2s;
}
.btn-outline-primary:hover{
    background: #E33535;
    color: #0A0F1A;
    border-color: #E33535;
}

/* 渐变文字 */
.gradient-text{
    background: linear-gradient(115deg, #E33535, #FF6B4A);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* 悬浮客服按钮 */
.floating-service{
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    cursor: pointer;
}
.float-btn{
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #E33535, #B91C1C);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 26px;
    box-shadow: 0 8px 20px rgba(227, 53, 53, 0.45);
    transition: all 0.3s ease;
    border: none;
    outline: none;
}
.float-btn:hover{
    transform: scale(1.08);
    box-shadow: 0 12px 28px rgba(227, 53, 53, 0.65);
}
.float-tooltip{
    position: absolute;
    right: 72px;
    top: 50%;
    transform: translateY(-50%);
    background: #121A2C;
    color: white;
    padding: 8px 16px;
    border-radius: 14px;
    font-size: 13px;
    white-space: nowrap;
    border: 1px solid #E33535;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    font-weight: 500;
    backdrop-filter: blur(4px);
}
.floating-service:hover .float-tooltip{ opacity: 1; }

/* 移动端菜单 */
.mobile-menu-btn{ display: none; }
@media (max-width: 768px){
    .mobile-menu-btn{ display: flex; }
    .desktop-nav{ display: none !important; }
    .mobile-nav-menu{
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(10, 15, 26, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(227, 53, 53, 0.3);
        border-top: 1px solid rgba(227, 53, 53, 0.2);
        padding: 1rem 1.5rem;
        flex-direction: column;
        gap: 1rem;
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        z-index: 40;
        display: flex;
    }
    .mobile-nav-menu.open{ transform: translateY(0); }
    .mobile-nav-menu a,
    .mobile-nav-menu button{
        display: block;
        padding: 0.5rem 0;
        font-size: 1rem;
        font-weight: 500;
        color: #D1D5DB;
    }
    .float-btn{ width: 50px; height: 50px; font-size: 22px; }
    .floating-service{ right: 16px; }
}

/* 公共弹窗基础 */
.modal-overlay{
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    transition: opacity 0.3s ease;
}
.modal-container{
    max-width: 520px;
    width: 90%;
    background: #121A2C;
    border: 1px solid #E33535;
    border-radius: 36px;
    box-shadow: 0 30px 40px -15px rgba(0, 0, 0, 0.6);
}
.close-modal-btn{ transition: all 0.2s; }
.close-modal-btn:hover{ color: #E33535; transform: rotate(90deg); }

/* 页脚 Logo / Hero 徽章 */
.footer-logo-img{ width: 100%; height: 100%; object-fit: cover; }
.hero-badge{
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(227, 53, 53, 0.12);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(227, 53, 53, 0.3);
}

/* ============ 品牌 logo 链接 ============ */
.brand-link {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}
.brand-link:hover { opacity: .92; }

/* ============ 一键回到顶部 ============ */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 28px;
    z-index: 998;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    outline: none;
    cursor: pointer;
    color: #fff;
    font-size: 18px;
    background: linear-gradient(135deg, #E33535, #B91C1C);
    box-shadow: 0 8px 20px rgba(227, 53, 53, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: opacity .3s ease, transform .3s ease, box-shadow .3s ease;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-3px) scale(1.08);
    box-shadow: 0 12px 26px rgba(227, 53, 53, 0.6);
}
@media (max-width: 768px) {
    .back-to-top {
        width: 42px;
        height: 42px;
        font-size: 16px;
        right: 15px;
        bottom: 20px;
    }
}