:root {
    --color-red: #b01028;
    --color-red-deep: #8a0c1f;
    --color-red-banner: #c8102e;
    --color-gold: #d4af37;
    --color-gold-light: #e8c547;
    --color-gold-muted: #c9a227;
    --color-cream: #faf5ef;
    --color-cream-card: #fff9f2;
    --color-text: #2c2c2c;
    --color-text-muted: #5a534c;
    --color-white: #fff;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "SimHei", Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-cream);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(180deg, var(--color-red-banner) 0%, var(--color-red) 100%);
    padding: 0;
    box-shadow: 0 2px 12px rgba(139, 12, 31, 0.35);
    height: 80px;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    height: 100%;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
    height: 100%;
}

.logo-circle {
    width: 60px;
    height: 60px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 2px solid var(--color-gold-light);
    box-shadow: 0 0 0 1px rgba(212, 175, 55, 0.35);
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 50%;
}

.logo-name {
    font-size: 24px;
    color: var(--color-gold-light);
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.nav {
    display: flex;
    gap: 0;
    align-items: stretch;
    height: 100%;
}

.nav-link {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.92);
    font-size: 16px;
    padding: 0 30px;
    border-radius: 0;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-width: 140px;
    width: 140px;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-red-deep);
    background-color: var(--color-gold-light);
}

.nav-link.active {
    background-color: var(--color-gold);
    color: var(--color-red-deep);
    font-weight: bold;
}

/* Banner */
.banner {
    background: linear-gradient(135deg, var(--color-red-banner) 0%, var(--color-red-deep) 55%, #6d0818 100%);
    padding: 80px 0;
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.banner::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 50% at 70% 20%, rgba(212, 175, 55, 0.12), transparent 55%);
    pointer-events: none;
}

.banner .container {
    position: relative;
    z-index: 1;
}

.banner-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

.banner-logo {
    flex-shrink: 0;
}

.banner-logo-circle {
    width: 150px;
    height: 150px;
    background: rgba(0, 0, 0, 0.12);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-gold-light);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
    overflow: hidden;
}

.banner-logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.banner-text {
    flex: 1;
}

.banner-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    color: var(--color-gold-light);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.banner-slogan {
    font-size: 24px;
    margin-bottom: 30px;
    color: rgba(255, 255, 255, 0.95);
    letter-spacing: 0.05em;
}

.banner-description {
    font-size: 16px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

/* 关于我们 */
.about-section {
    padding: 60px 0 40px;
    background-color: var(--color-cream);
}

.about-inner {
    max-width: 900px;
    margin: 0 auto;
}

.section-title {
    font-size: 36px;
    color: var(--color-red);
    margin-bottom: 28px;
    font-weight: bold;
    text-align: center;
}

.section-title::after {
    content: "";
    display: block;
    width: 64px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light));
    margin: 14px auto 0;
    border-radius: 2px;
}

.about-body p {
    font-size: 17px;
    color: var(--color-text-muted);
    line-height: 2;
    margin-bottom: 1.25em;
    text-align: justify;
}

.about-body p:last-child {
    margin-bottom: 0;
}

/* App section background stripe */
.app-section {
    padding: 50px 0 60px;
    background-color: var(--color-cream-card);
}

/* Content Section (shared) */
.content {
    padding: 60px 0;
}

.app-title-section {
    margin-bottom: 40px;
}

.app-title {
    font-size: 36px;
    color: var(--color-text);
    margin: 0;
    margin-bottom: 5px;
    font-weight: normal;
}

.app-subtitle {
    font-size: 16px;
    color: #8a8278;
    display: block;
    margin-left: 5px;
    margin-bottom: 15px;
}

.app-title-line {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--color-gold) 0%, rgba(212, 175, 55, 0.2) 100%);
    margin-top: 15px;
}

.app-content-row {
    display: flex;
    align-items: flex-start;
    gap: 40px;
    margin-bottom: 50px;
}

.app-image {
    width: 400px;
    height: 300px;
    border-radius: 8px;
    flex-shrink: 0;
    object-fit: contain;
    border: 1px solid rgba(176, 16, 40, 0.12);
    box-shadow: 0 4px 20px rgba(139, 12, 31, 0.08);
}

.app-description {
    font-size: 18px;
    color: var(--color-text);
    line-height: 2;
    margin: 0;
    flex: 1;
    padding: 40px;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-cream-card) 100%);
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(139, 12, 31, 0.06);
    letter-spacing: 0.5px;
    position: relative;
    border-left: 4px solid var(--color-gold);
}

.app-description::before {
    content: '"';
    font-size: 60px;
    color: var(--color-gold);
    opacity: 0.2;
    position: absolute;
    top: 20px;
    left: 20px;
    font-family: Georgia, serif;
    line-height: 1;
}

.app-description::after {
    content: '"';
    font-size: 60px;
    color: var(--color-gold);
    opacity: 0.2;
    position: absolute;
    bottom: 20px;
    right: 20px;
    font-family: Georgia, serif;
    line-height: 1;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.feature-item {
    padding: 30px;
    background-color: var(--color-white);
    border-radius: 8px;
    border-left: 4px solid var(--color-red);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.feature-title {
    font-size: 24px;
    color: var(--color-red);
    margin-bottom: 15px;
    font-weight: bold;
}

.feature-description {
    font-size: 16px;
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* Contact Section */
.contact-content {
    padding: 80px 0;
    background-color: var(--color-cream);
}

.contact-section {
    max-width: 800px;
    margin: 0 auto;
}

.contact-title {
    font-size: 36px;
    color: var(--color-red);
    margin-bottom: 30px;
    text-align: center;
    font-weight: bold;
}

.contact-description {
    font-size: 16px;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 50px;
    text-align: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
    background-color: var(--color-white);
    padding: 40px;
    border-radius: 8px;
    border: 1px solid rgba(212, 175, 55, 0.35);
    box-shadow: 0 4px 20px rgba(139, 12, 31, 0.06);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.contact-label {
    font-size: 18px;
    color: var(--color-red);
    font-weight: bold;
    min-width: 100px;
}

.contact-value {
    font-size: 18px;
    color: var(--color-text-muted);
    flex: 1;
}

/* Footer */
.footer {
    background: linear-gradient(180deg, var(--color-red-deep) 0%, #5a0714 100%);
    color: var(--color-white);
    padding: 40px 0;
    text-align: center;
}

.footer-brand {
    font-size: 17px;
    color: var(--color-gold-light);
    margin-bottom: 8px;
    font-weight: bold;
}

.footer-company {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
}

.footer-info {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.88);
}

.footer-link {
    color: var(--color-gold-light);
    text-decoration: none;
}

.footer-link:hover {
    color: var(--color-white);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .banner-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .banner-title {
        font-size: 36px;
    }

    .banner-slogan {
        font-size: 20px;
    }

    .app-content-row {
        flex-direction: column;
    }

    .app-image {
        width: 100%;
        height: auto;
        max-height: 300px;
    }

    .header .container {
        flex-direction: column;
        gap: 0;
        height: auto;
    }

    .header {
        height: auto;
    }

    .logo-section {
        padding: 15px 0;
    }

    .nav {
        width: 100%;
        justify-content: stretch;
        flex-direction: column;
    }

    .nav-link {
        min-height: 50px;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .contact-item {
        flex-direction: column;
        gap: 10px;
    }

    .contact-label {
        min-width: auto;
    }
}