* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

:root {
    --logo-dark: #0a0a0a;
    --logo-gold: #D9C288;
    --logo-blue: #005f87;
    --border-color: rgba(217, 194, 136, 0.8);
    --card-bg: rgba(10, 10, 10, 0.65);
    --text-main: #E5E5E5;
    --text-title: #F0F0F0;
    --text-light: #E5E5E5;
    --shadow-color: rgba(217, 194, 136, 0.4);

    --btn-unactive-bg: #0a0a0a;
    --btn-unactive-text: #D9C288;
    --btn-unactive-border: #D9C288;
    --btn-active-bg: #D9C288;
    --btn-active-text: #0a0a0a;
    --btn-active-border: #0a0a0a;

    --tip-text-color: #E6B800;
    --tip-text-shadow: 0 0 2px rgba(0,0,0,0.7);

    --core-sentence-weight: bold;
    --core-sentence-color: #D9C288;
    --core-sentence-size: 1.1em;
}

body {
    background: url('../images/circuit-bg.jpg') fixed center/cover no-repeat;
    background-color: rgba(0, 0, 0, 0.4);
    color: var(--text-main);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    transition: 0.3s;
}

.top-nav {
    background-color: rgba(10, 10, 10, 0.9);
    border-bottom: 2px solid var(--logo-gold);
    box-shadow: 0 1px 8px var(--shadow-color);
    width: 100%;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.nav-container {
    max-width: 100%;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 80px;
    padding: 0 10px;
}
.logo-container {
    width: 150px;
    height: 80px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
}
.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}
.nav-menu {
    display: flex;
    list-style: none;
    width: calc(100% - 140px);
    justify-content: space-around;
    padding: 0;
    margin: 0;
}
.nav-menu li {
    flex: 1;
    text-align: center;
    height: 80px;
    line-height: 80px;
    border-right: 1px solid rgba(255,255,255,0.1);
    padding: 0 5px;
    white-space: nowrap;
}
.nav-menu li:last-child {
    border-right: none;
}
.nav-menu li a {
    color: var(--text-light);
    opacity: 0.9;
    display: block;
    width: 100%;
    height: 100%;
}
.nav-menu li a:hover {
    color: var(--logo-gold);
    opacity: 1;
    background-color: rgba(255,255,255,0.08);
}
.lang-switch {
    color: var(--logo-gold) !important;
    cursor: pointer;
    opacity: 0.95;
    user-select: none;
    display: block;
    width: 100%;
    height: 100%;
}
.lang-switch:hover {
    background-color: rgba(255,255,255,0.08);
}

.carousel-section {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
    width: 100%;
}

#carouselExampleControls {
    width: 100%;
    height: 400px;
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.carousel-inner {
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    background-color: #000;
    width: 100%;
    height: 100%;
    position: relative;
}

.carousel-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.carousel-control-prev,
.carousel-control-next {
    width: 50px;
    height: 50px;
    top: 50%;
    transform: translateY(-50%);
    border-radius: 50%;
    background-color: rgba(10, 10, 10, 0.7);
    border: 1px solid var(--logo-gold);
    z-index: 10;
    opacity: 1;
}

.carousel-control-prev {
    left: 10px;
}

.carousel-control-next {
    right: 10px;
}

.carousel-control-prev:hover,
.carousel-control-next:hover {
    background-color: rgba(217, 194, 136, 0.8);
}

.concept-section,
.intro-section {
    max-width: 1200px;
    margin: 25px auto;
    padding: 25px 30px;
    background: var(--card-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    height: auto !important;
    min-height: 400px;
    overflow: visible !important;
    padding-bottom: 30px !important;
}
.concept-title,
.intro-title {
    font-size: 19px;
    color: var(--logo-gold);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
}
.concept-content, .intro-content {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-main);
    height: auto !important;
    overflow: visible !important;
    white-space: normal !important;
}

.concept-content strong {
    font-weight: var(--core-sentence-weight) !important;
    color: var(--core-sentence-color) !important;
    font-size: var(--core-sentence-size) !important;
    display: inline-block;
    margin: 5px 0;
}

.quote-btn-group {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px auto;
    max-width: 1200px;
    padding: 0 20px;
}
.quote-btn {
    background: var(--btn-unactive-bg) !important;
    color: var(--btn-unactive-text) !important;
    border: 2px solid var(--btn-unactive-border) !important;
    opacity: 1 !important;
    filter: none !important;
    padding: 15px 30px !important;
    font-size: 18px !important;
    font-weight: 500 !important;
    border-radius: 6px !important;
    cursor: pointer !important;
    min-width: 180px;
    white-space: nowrap;
    text-align: center;
    box-shadow: 0 2px 8px var(--shadow-color);
}
.quote-btn.active, 
.quote-btn:focus, 
.quote-btn:active {
    background: var(--btn-active-bg) !important;
    color: var(--btn-active-text) !important;
    border: 2px solid var(--btn-active-border) !important;
    outline: none !important;
    box-shadow: 0 4px 12px var(--shadow-color);
}
.quote-btn:hover:not(.active) {
    background: var(--logo-blue) !important;
    color: #FFFFFF !important;
    border-color: var(--logo-gold) !important;
    transform: translateY(-2px);
}

.quote-form {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.quote-form .form-item {
    margin-bottom: 15px;
}
.quote-form .form-item label {
    display: block;
    margin-bottom: 5px;
    color: var(--logo-gold);
    font-size: 16px;
}
.quote-form .file-input {
    padding: 8px 15px;
    background: var(--btn-unactive-bg);
    color: var(--btn-unactive-text);
    border: 1px solid var(--btn-unactive-border);
    border-radius: 4px;
    cursor: pointer;
    opacity: 1 !important;
}

.email-tip {
    font-size: 1.15rem !important;
    font-weight: 500 !important;
    color: var(--tip-text-color) !important;
    text-shadow: var(--tip-text-shadow) !important;
    margin-top: 25px !important;
    line-height: 1.8 !important;
    text-align: center !important;
}

#submitQuote {
    padding: 12px 30px !important;
    font-size: 1.1rem !important;
    border-radius: 6px !important;
    min-width: 200px !important;
    display: block !important;
    margin: 0 auto !important;
}

.footer {
    background-color: rgba(10, 10, 10, 0.9);
    color: var(--text-light);
    padding: 35px 0 20px;
    border-top: 2px solid var(--logo-gold);
    margin-top: 30px;
    box-shadow: 0 -2px 8px var(--shadow-color);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
}
.footer-left, .footer-right {
    width: 48%;
    opacity: 0.95;
}
.footer-nav {
    list-style: none;
    padding: 0;
}
.footer-nav li {
    margin-bottom: 8px;
}
.footer-nav a {
    color: var(--text-light);
    opacity: 0.9;
}
.footer-nav a:hover {
    color: var(--logo-gold);
    opacity: 1;
}
.footer-right p:first-child {
    color: var(--logo-gold);
    font-size: 16px;
    font-weight: 500;
}
.footer-copyright {
    text-align: center;
    padding: 15px;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 15px;
    font-size: 14px;
    opacity: 0.85;
}

.article-content-page {
    max-width: 900px;
    margin: 60px auto;
    padding: 40px 30px;
    color: var(--text-main);
    line-height: 1.9;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 3px 12px var(--shadow-color);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}
.article-content-page h1 {
    color: var(--logo-gold);
    font-size: 26px;
    margin-bottom: 30px;
    text-align: center;
}
.article-content-page p {
    font-size: 16px;
    margin-bottom: 16px;
}
.back-btn {
    margin-bottom: 30px;
}
.back-btn a {
    color: var(--logo-gold);
    text-decoration: none;
    font-size: 16px;
}

/* ====================== */
/* 移动端完整最终修复 */
/* ====================== */
@media (max-width:768px) {
    html, body {
        overflow-x: hidden !important;
        width: 100% !important;
    }

    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 10px 15px;
    }
    .logo-container {
        width: 120px;
        height: 60px;
        margin: 0 auto 10px;
        padding-bottom: 10px;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .nav-menu {
        flex-direction: column;
        width: 100%;
    }
    .nav-menu li {
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.1);
        height: auto;
        line-height: 44px;
        padding: 0;
        text-align: center;
    }
    .nav-menu li a {
        font-size: 15px;
        padding: 0 10px;
    }

    #carouselExampleControls {
        height: 220px !important;
    }
    .carousel-item img {
        height: 220px !important;
        object-fit: cover !important;
    }

    .concept-section,
    .intro-section,
    .article-content-page {
        margin: 20px 15px;
        padding: 20px 15px;
        font-size: 15px;
        line-height: 1.7;
    }
    .concept-title,
    .intro-title {
        font-size: 17px;
    }
    .concept-content,
    .intro-content {
        font-size: 15px;
    }

    .quote-btn-group {
        flex-direction: column;
        gap: 10px;
        padding: 0 15px;
    }
    .quote-btn {
        width: 100%;
        min-width: unset;
        padding: 12px 20px !important;
        font-size: 16px !important;
    }

    .quote-form {
        padding: 0 15px;
    }
    .form-item label {
        font-size: 15px;
    }

    .email-tip {
        font-size: 1rem !important;
        padding: 0 10px;
    }
    #submitQuote {
        padding: 12px 25px !important;
        font-size: 1rem !important;
        min-width: 180px !important;
    }

    .concept-content strong {
        font-size: 1.05em !important;
    }

    .footer-container {
        flex-direction: column;
        padding: 0 20px;
    }
    .footer-left, .footer-right {
        width: 100%;
        margin-bottom: 20px;
    }
    .footer-copyright {
        padding: 15px 10px;
        font-size: 13px;
    }
}