/* 全站统一顶栏（政策页等未引入 business-detail.css 时使用） */
:root {
    --primary: #0066FF;
    --primary-dark: #0047B3;
    --accent: #00B4D8;
    --sub-gray: #F4F6F9;
    --dark: #0A1628;
    --dark-soft: #132337;
    --text: #1a1a1a;
    --text-light: #5c6370;
    --nav-h: 64px;
    --nav-bg: #071a33;
    --nav-bg-deep: #051226;
    --nav-text: #ffffff;
    --floating-yellow: #FFC107;
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: clamp(19px, 2.65vw, 39px);
    padding: 0 clamp(26px, 6.5vw, 68px);
    height: var(--nav-h);
    min-height: var(--nav-h);
    background: linear-gradient(180deg, var(--nav-bg) 0%, var(--nav-bg-deep) 100%);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: box-shadow 0.35s, background 0.35s;
    overflow: visible;
}
.nav.scrolled { box-shadow: 0 8px 28px rgba(0,0,0,0.35); }
.logo {
    font-size: 26px;
    font-weight: 700;
    color: var(--nav-text);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    flex-shrink: 0;
}
.logo img {
    display: block;
    filter: brightness(0) invert(1);
    height: calc(var(--nav-h) * 0.45) !important;
    width: auto !important;
    max-height: 32px;
}
.nav-menu {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    flex: 1 1 auto;
    min-width: 0;
    justify-content: center;
    gap: clamp(22px, 2.9vw, 48px);
    padding: 0 clamp(10px, 1.9vw, 34px);
    overflow: visible;
}
.nav-menu > a,
.nav-menu > .nav-dropdown {
    padding-inline: clamp(6px, 0.75vw, 12px);
}
.nav-menu a {
    margin: 0;
    flex-shrink: 0;
    text-decoration: none;
    color: rgba(255,255,255,0.92);
    font-size: clamp(14px, calc(var(--nav-h) * 0.26), 20px);
    line-height: 1.2;
    font-weight: 500;
    transition: color 0.25s;
    position: relative;
    white-space: nowrap;
}
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -0.2em;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.25s;
}
.nav-menu a:hover { color: var(--nav-text); }
.nav-menu a:hover::after { width: 100%; }
.nav-dropdown {
    position: relative;
    margin: 0;
    flex-shrink: 0;
}
.nav-dropdown-trigger {
    cursor: default;
    color: rgba(255,255,255,0.92);
    font-size: clamp(14px, calc(var(--nav-h) * 0.26), 20px);
    line-height: 1.2;
    font-weight: 500;
    display: inline-block;
    position: relative;
    white-space: nowrap;
    user-select: none;
}
.nav-dropdown-trigger::after {
    content: '';
    position: absolute;
    bottom: -0.2em;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.25s;
}
.nav-dropdown:hover .nav-dropdown-trigger::after,
.nav-dropdown:focus-within .nav-dropdown-trigger::after { width: 100%; }
.nav-dropdown:hover .nav-dropdown-trigger,
.nav-dropdown:focus-within .nav-dropdown-trigger { color: var(--nav-text); }
.nav-dropdown-hover-zone {
    display: none;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 100%;
    padding-top: 14px;
    min-width: 100%;
    z-index: 1001;
}
.nav-dropdown:hover .nav-dropdown-hover-zone,
.nav-dropdown:focus-within .nav-dropdown-hover-zone { display: block; }
.nav-dropdown-panel {
    min-width: 240px;
    padding: 10px 0;
    background: #fff;
    border: 1px solid rgba(10, 22, 40, 0.1);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}
.nav-dropdown-panel a {
    display: block;
    padding: 10px 20px;
    margin: 0;
    color: var(--dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    transition: background 0.2s, color 0.2s;
}
.nav-dropdown-panel a::after { display: none !important; }
.nav-dropdown-panel a:hover {
    background: rgba(0, 102, 255, 0.08);
    color: var(--primary);
}
.nav-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.lang-select {
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,0.28);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    cursor: pointer;
    background: rgba(255,255,255,0.1);
    color: var(--nav-text);
}
.lang-select:focus { border-color: var(--accent); }
.lang-select option { background: var(--nav-bg-deep); color: var(--nav-text); }
.btn {
    padding: 9px 22px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    white-space: nowrap;
}
.btn-console {
    background: linear-gradient(135deg, #FFC107 0%, #FF9800 100%);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(255,193,7,0.3);
}
.btn-console:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255,193,7,0.4);
}