:root {
    --color-green: #32b04f;
    --color-green-dark: #218838;
    --color-green-darker: #1a6d2e;
    --color-green-soft: #e8f5ec;
    --color-white: #ffffff;
    --color-bg: #f8f9fa;
    --color-text: #2d3436;
    --color-text-muted: #5c636a;
}

* {
    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-bg);
}

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

/* Header */
.header {
    background-color: var(--color-white);
    padding: 0;
    box-shadow: 0 2px 8px rgba(50, 176, 79, 0.12);
    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: var(--color-green-soft);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 2px solid rgba(50, 176, 79, 0.25);
    overflow: hidden;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

.logo-name {
    font-size: 24px;
    color: var(--color-green);
    font-weight: bold;
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-text-muted);
    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-green-dark);
    background-color: var(--color-green-soft);
}

.nav-link.active {
    background-color: var(--color-green);
    color: var(--color-white);
}

.nav-link.active:hover {
    background-color: var(--color-green-dark);
    color: var(--color-white);
}

/* Banner */
.banner {
    background: linear-gradient(135deg, var(--color-green) 0%, var(--color-green-dark) 100%);
    padding: 80px 0;
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.banner::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 60% at 80% 0%, rgba(255, 255, 255, 0.12), transparent 50%);
    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(255, 255, 255, 0.15);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid rgba(255, 255, 255, 0.85);
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.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-white);
}

.banner-slogan {
    font-size: 22px;
    margin-bottom: 30px;
    color: rgba(255, 255, 255, 0.96);
    line-height: 1.5;
    font-weight: 600;
}

.banner-description {
    font-size: 16px;
    line-height: 1.85;
    color: rgba(255, 255, 255, 0.92);
}

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

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

.section-title {
    font-size: 36px;
    color: var(--color-green);
    margin-bottom: 20px;
    font-weight: bold;
    text-align: center;
}

.section-title::after {
    content: "";
    display: block;
    width: 56px;
    height: 3px;
    background: var(--color-green);
    margin: 14px auto 0;
    border-radius: 2px;
}

.about-lead {
    font-size: 20px;
    color: var(--color-green-dark);
    font-weight: bold;
    text-align: center;
    line-height: 1.6;
    margin-bottom: 28px;
}

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

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

.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: #889096;
    display: block;
    margin-left: 5px;
    margin-bottom: 15px;
}

.app-title-line {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--color-green) 0%, rgba(50, 176, 79, 0.15) 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(50, 176, 79, 0.12);
    background: var(--color-white);
    box-shadow: 0 2px 12px rgba(50, 176, 79, 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-green-soft) 100%);
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
    letter-spacing: 0.5px;
    position: relative;
    border-left: 4px solid var(--color-green);
}

.app-description::before {
    content: '"';
    font-size: 60px;
    color: var(--color-green);
    opacity: 0.12;
    position: absolute;
    top: 20px;
    left: 20px;
    font-family: Georgia, serif;
    line-height: 1;
}

.app-description::after {
    content: '"';
    font-size: 60px;
    color: var(--color-green);
    opacity: 0.12;
    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-green);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.feature-title {
    font-size: 24px;
    color: var(--color-green);
    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-white);
}

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

.contact-title {
    font-size: 36px;
    color: var(--color-green);
    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-bg);
    padding: 40px;
    border-radius: 8px;
    border: 1px solid rgba(50, 176, 79, 0.2);
}

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

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

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

.contact-link {
    color: var(--color-green);
    text-decoration: none;
    font-weight: 600;
}

.contact-link:hover {
    color: var(--color-green-dark);
    text-decoration: underline;
}

/* Footer */
.footer {
    background: linear-gradient(180deg, var(--color-green-darker) 0%, #145522 100%);
    color: var(--color-white);
    padding: 40px 0;
    text-align: center;
}

.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, 0.9);
}

.footer-link {
    color: rgba(255, 255, 255, 0.95);
    text-decoration: none;
    font-weight: 500;
}

.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: 18px;
    }

    .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 var(--color-green-soft);
    }

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

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

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