/* 现代深色科技风，带轻玻璃拟态卡片和霓虹高亮点缀 */

:root {
    --page-bg: #0f172a;               /* slate-900 */
    --card-bg: rgba(15, 23, 42, 0.6); /* slate-900 with alpha */
    --card-stroke: rgba(148, 255, 207, 0.22);

    --text-main: #f8fafc;     /* almost white */
    --text-dim: #94a3b8;      /* slate-400 */
    --accent: #34d399;        /* emerald-400 */
    --accent-soft: rgba(52, 211, 153, 0.12);

    --radius-lg: 1.25rem;
    --radius-md: .75rem;
    --radius-full: 999px;

    --container-max: 1280px;
    --transition-base: .28s cubic-bezier(.2,.8,.4,1);

    font-size: 16px;
    font-family:
        "Inter",
        "Noto Sans SC",
        -apple-system,
        BlinkMacSystemFont,
        "PingFang SC",
        "Microsoft YaHei",
        "Helvetica Neue",
        Arial,
        sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-color: var(--page-bg);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img,
svg {
    display: block;
    max-width: 100%;
}

/* 通用布局 */

.container {
    width: 100%;
    max-width: var(--container-max);
    padding-left: 1.25rem;
    padding-right: 1.25rem;
    margin-left: auto;
    margin-right: auto;
}

.section {
    padding: clamp(3rem, 2vw, 4rem) 0 clamp(4rem, 3vw, 6rem);
    position: relative;
}

.section-head {
    max-width: 680px;
    margin: 0 auto 3rem;
    text-align: center;
}

.section-title {
    font-size: clamp(1.5rem, 1vw + 1rem, 2rem);
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.3;
    margin: 0 0 .75rem;
    letter-spacing: -0.03em;
}

.section-desc {
    font-size: 1rem;
    color: var(--text-dim);
    margin: 0 0 1rem;
    line-height: 1.6;
}

/* 顶部导航栏 */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(148, 255, 207, 0.08);
}

.nav-inner {
    display: flex;
    align-items: center;
    min-height: 64px;
    justify-content: space-between;
    position: relative;
}

.brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-main);
    gap: .75rem;
}

.brand-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    display: grid;
    place-items: center;
    border-radius: var(--radius-md);
    background: radial-gradient(circle at 20% 20%, #1e293b 0%, #0f172a 60%);
    box-shadow: 0 20px 40px rgba(0,0,0,.8),
                0 0 30px rgba(52,211,153,.35);
    border: 1px solid rgba(148,255,207,.3);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    white-space: nowrap;
}

.brand-text .cn {
    font-size: .9rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.03em;
}
.brand-text .en {
    font-size: .7rem;
    font-weight: 500;
    color: var(--accent);
    opacity: .8;
}

/* nav menu */

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: .9rem;
    font-weight: 500;
}

.nav-link {
    color: var(--text-main);
    text-decoration: none;
    line-height: 1;
    padding: .6rem .8rem;
    border-radius: var(--radius-full);
    position: relative;
    transition: color var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.nav-link:hover {
    background: rgba(148,255,207,.08);
    box-shadow: 0 0 20px rgba(52,211,153,.6);
    color: var(--accent);
}

.cta-nav {
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid rgba(52,211,153,.4);
}
.cta-nav:hover {
    background: rgba(52,211,153,.18);
}

/* burger button (mobile only by default hidden on desktop) */

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid rgba(148,255,207,.3);
    box-shadow: 0 20px 40px rgba(0,0,0,.8),
                0 0 20px rgba(52,211,153,.4);
    cursor: pointer;
    padding: 0;
}

.nav-toggle .bar {
    width: 20px;
    height: 2px;
    background: var(--text-main);
    border-radius: 1px;
    transition: all var(--transition-base);
}
.nav-toggle .bar + .bar {
    margin-top: 4px;
}

.nav-toggle.open .bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
.nav-toggle.open .bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle.open .bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Hero */

.hero-section {
    position: relative;
    padding-top: 4rem;
    padding-bottom: 4rem;
    overflow: hidden;
    background: radial-gradient(circle at 20% 20%, rgba(52,211,153,.15) 0%, rgba(15,23,42,0) 70%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 80% 20%, rgba(37,99,235,.15) 0%, rgba(15,23,42,0) 70%),
        radial-gradient(circle at 50% 80%, rgba(148,255,207,.12) 0%, rgba(15,23,42,0) 70%);
    filter: blur(60px);
    opacity: .6;
}

.hero-inner {
    position: relative;
    display: grid;
    align-items: flex-start;
    gap: 2rem;
    z-index: 1;
}

@media (min-width: 900px) {
    .hero-inner {
        grid-template-columns: minmax(0,1fr) minmax(0,400px);
        align-items: stretch;
    }
}

.hero-copy {
    max-width: 640px;
}

.hero-title {
    margin: 0 0 1rem;
    font-size: clamp(1.9rem, 1vw + 1rem, 2.4rem);
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-main);
    letter-spacing: -0.04em;
}

.hero-title .accent {
    color: var(--accent);
    text-shadow: 0 0 15px rgba(52,211,153,.6);
}

.hero-desc {
    margin: 0 0 1.5rem;
    font-size: 1rem;
    color: var(--text-dim);
    line-height: 1.6;
}

.hero-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-bottom: 2rem;
}

.btn-primary {
    display: inline-block;
    background: var(--accent);
    color: #0f172a;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-full);
    padding: .7rem 1rem;
    font-size: .9rem;
    line-height: 1.2;
    border: 0;
    cursor: pointer;
    box-shadow:
        0 20px 40px rgba(0,0,0,.9),
        0 0 30px rgba(52,211,153,.8);
    transition: all var(--transition-base);
}
.btn-primary:hover {
    box-shadow:
        0 30px 60px rgba(0,0,0,1),
        0 0 40px rgba(52,211,153,1);
}

.btn-ghost {
    display: inline-block;
    background: rgba(148,255,207,.08);
    border: 1px solid rgba(148,255,207,.4);
    border-radius: var(--radius-full);
    color: var(--accent);
    font-weight: 500;
    text-decoration: none;
    padding: .7rem 1rem;
    font-size: .9rem;
    line-height: 1.2;
    transition: all var(--transition-base);
}
.btn-ghost:hover {
    background: rgba(148,255,207,.18);
    box-shadow: 0 0 24px rgba(52,211,153,.8);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 2rem;
    font-size: .8rem;
    color: var(--text-dim);
}

.meta-item {
    min-width: 6rem;
}
.meta-num {
    color: var(--accent);
    font-weight: 600;
    font-size: .9rem;
    line-height: 1.2;
    text-shadow: 0 0 15px rgba(52,211,153,.6);
}
.meta-label {
    font-size: .75rem;
    color: var(--text-dim);
}

.hero-card {
    display: grid;
    gap: 1rem;
    align-self: stretch;
}

.mini-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-stroke);
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 80px rgba(52,211,153,.3);
    padding: 1.25rem 1rem 1rem;
    font-size: .8rem;
}

.mini-head {
    color: var(--accent);
    font-weight: 500;
    font-size: .75rem;
    margin: 0 0 .25rem;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}
.mini-main {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0 0 .75rem;
}
.mini-stats {
    list-style: none;
    padding: 0;
    margin: 0 0 .75rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: .5rem .75rem;
}
.mini-stats li {
    background: rgba(15,23,42,.6);
    border-radius: var(--radius-md);
    border: 1px solid rgba(148,255,207,.2);
    padding: .5rem .6rem;
    line-height: 1.4;
    box-shadow: 0 20px 40px rgba(0,0,0,.8);
}
.mini-stats li span {
    display: block;
    font-size: .7rem;
    color: var(--text-dim);
}
.mini-stats li b {
    font-size: .9rem;
    font-weight: 600;
    color: var(--text-main);
}
.mini-foot {
    margin: 0;
    font-size: .7rem;
    color: var(--text-dim);
    line-height: 1.4;
}

.glass-note {
    font-size: .75rem;
    line-height: 1.4;
    color: var(--text-main);
    background: rgba(148,255,207,.08);
    border: 1px solid rgba(148,255,207,.4);
    border-radius: var(--radius-md);
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 40px rgba(52,211,153,.4);
    padding: .75rem 1rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .5rem;
}
.glass-note .dot {
    width: .4rem;
    height: .4rem;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 10px rgba(52,211,153,.9);
}

/* 解决方案 */

.solutions-grid {
    display: grid;
    gap: 1.5rem;
}
@media (min-width: 800px) {
    .solutions-grid {
        grid-template-columns: repeat(3, minmax(0,1fr));
    }
}

.sol-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-stroke);
    padding: 1.5rem 1.25rem 1.25rem;
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 60px rgba(52,211,153,.25);
}

.sol-icon {
    font-size: 1.25rem;
    line-height: 1;
    margin-bottom: .75rem;
    text-shadow: 0 0 15px rgba(52,211,153,.8);
}

.sol-title {
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    margin: 0 0 .5rem;
}
.sol-desc {
    margin: 0 0 .75rem;
    font-size: .9rem;
    color: var(--text-dim);
    line-height: 1.5;
}
.sol-list {
    padding-left: 1rem;
    margin: 0;
    font-size: .8rem;
    color: var(--text-main);
    line-height: 1.5;
}
.sol-list li {
    margin-bottom: .4rem;
}

/* 关于我们 */

.about-inner {
    display: grid;
    gap: 2rem;
}
@media (min-width: 900px) {
    .about-inner {
        grid-template-columns: minmax(0,1fr) minmax(0,360px);
        align-items: start;
    }
}

.about-copy .section-desc {
    max-width: 640px;
}

.about-highlights {
    display: grid;
    gap: 1rem;
    margin-top: 2rem;
}
@media (min-width: 600px) {
    .about-highlights {
        grid-template-columns: repeat(3, minmax(0,1fr));
    }
}
.hl-box {
    background: rgba(148,255,207,.08);
    border: 1px solid rgba(148,255,207,.4);
    border-radius: var(--radius-md);
    padding: 1rem .75rem;
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 40px rgba(52,211,153,.4);
}
.hl-num {
    font-size: .9rem;
    color: var(--accent);
    font-weight: 600;
    line-height: 1.3;
    text-shadow: 0 0 15px rgba(52,211,153,.7);
    margin-bottom: .25rem;
}
.hl-text {
    font-size: .75rem;
    color: var(--text-main);
    line-height: 1.4;
    opacity: .9;
}

.about-card {
    position: relative;
}
.about-glass {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-stroke);
    padding: 1.25rem 1rem 1rem;
    font-size: .8rem;
    line-height: 1.5;
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 60px rgba(52,211,153,.3);
}
.about-mini-title {
    font-size: .8rem;
    font-weight: 600;
    color: var(--accent);
    margin: 0 0 .5rem;
    text-shadow: 0 0 15px rgba(52,211,153,.7);
}
.about-list {
    margin: 0 0 .75rem;
    padding-left: 1rem;
    color: var(--text-main);
}
.about-list li {
    margin-bottom: .4rem;
    font-size: .8rem;
}
.about-mini-note {
    font-size: .7rem;
    color: var(--text-dim);
    margin: 0;
    line-height: 1.4;
}

/* 联系我们 */

.contact-inner {
    display: grid;
    gap: 2rem;
}
@media (min-width: 900px) {
    .contact-inner {
        grid-template-columns: minmax(0,1fr) minmax(0,420px);
        align-items: start;
    }
}

.contact-left .section-title {
    margin-bottom: .75rem;
}

.contact-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-stroke);
    padding: 1rem .75rem;
    font-size: .8rem;
    line-height: 1.5;
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 60px rgba(52,211,153,.25);
}

.contact-row {
    display: grid;
    grid-template-columns: 6rem minmax(0,1fr);
    gap: .5rem 1rem;
    padding: .5rem 0;
    border-bottom: 1px solid rgba(148,255,207,.1);
}
.contact-row:last-child {
    border-bottom: 0;
}
.contact-label {
    font-size: .7rem;
    color: var(--text-dim);
    line-height: 1.4;
}
.contact-value {
    font-size: .8rem;
    color: var(--text-main);
    line-height: 1.4;
    word-break: break-word;
}

.linkish {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px dotted rgba(52,211,153,.4);
}
.linkish:hover {
    color: var(--text-main);
    text-shadow: 0 0 15px rgba(52,211,153,.8);
}

.contact-hint {
    font-size: .7rem;
    color: var(--text-dim);
    line-height: 1.5;
    margin-top: 1rem;
    max-width: 440px;
}

/* 联系右侧表单 */

.contact-form {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-stroke);
    box-shadow:
        0 30px 80px rgba(0,0,0,.9),
        0 0 60px rgba(52,211,153,.3);
    padding: 1.25rem 1rem 1rem;
    font-size: .8rem;
    line-height: 1.5;
}

.form-field {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}
.form-field label {
    font-size: .75rem;
    color: var(--text-main);
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: .4rem;
}
.form-field input,
.form-field textarea {
    appearance: none;
    border: 1px solid rgba(148,255,207,.4);
    background: rgba(0,0,0,.2);
    color: var(--text-main);
    border-radius: var(--radius-md);
    font-size: .8rem;
    line-height: 1.4;
    padding: .6rem .75rem;
    outline: none;
    font-family: inherit;
    box-shadow: 0 20px 40px rgba(0,0,0,.8),
                0 0 20px rgba(52,211,153,.3);
    transition: box-shadow var(--transition-base), border var(--transition-base);
}
.form-field input:focus,
.form-field textarea:focus {
    border: 1px solid var(--accent);
    box-shadow: 0 30px 80px rgba(0,0,0,1),
                0 0 30px rgba(52,211,153,.8);
}

.form-submit {
    width: 100%;
    justify-content: center;
    margin-bottom: .75rem;
}

.form-tip {
    font-size: .7rem;
    color: var(--text-dim);
    line-height: 1.4;
    margin: 0;
}

/* 页脚 */

.site-footer {
    border-top: 1px solid rgba(148,255,207,.08);
    background: rgba(15,23,42,0.6);
    backdrop-filter: blur(12px);
    padding: 2rem 0 3rem;
    font-size: .75rem;
    line-height: 1.4;
    color: var(--text-dim);
}

.footer-inner {
    display: grid;
    gap: 2rem;
}
@media (min-width: 800px) {
    .footer-inner {
        grid-template-columns: minmax(0,1fr) minmax(0,1fr);
    }
}

.footer-brand {
    font-size: .8rem;
    color: var(--text-main);
    font-weight: 500;
    line-height: 1.4;
}
.footer-slogan {
    margin-top: .5rem;
    font-size: .7rem;
    color: var(--text-dim);
}

.footer-right {
    display: grid;
    gap: 1rem;
    justify-items: start;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 1.5rem;
}
.footer-links a {
    color: var(--text-main);
    text-decoration: none;
    transition: color var(--transition-base), text-shadow var(--transition-base);
    font-size: .75rem;
    line-height: 1.4;
}
.footer-links a:hover {
    color: var(--accent);
    text-shadow: 0 0 15px rgba(52,211,153,.8);
}
.footer-legal {
    display: flex;
    flex-direction: column;
    gap: .4rem;
    font-size: .7rem;
    line-height: 1.4;
    color: var(--text-dim);
}
.footer-legal .icp {
    opacity: .8;
    font-size: .7rem;
}

/* reveal 动效（进场淡入上浮） */

.reveal {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
    transition: all .6s cubic-bezier(.16,1,.3,1);
    will-change: transform, opacity;
}
.reveal.show {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* 响应式菜单：小屏下把 .nav-menu 变成弹出层 */

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: calc(100% + .5rem);
        right: 1rem;
        background: rgba(15,23,42,.8);
        backdrop-filter: blur(16px);
        border: 1px solid rgba(148,255,207,.3);
        box-shadow:
            0 30px 80px rgba(0,0,0,1),
            0 0 60px rgba(52,211,153,.4);
        border-radius: var(--radius-lg);

        flex-direction: column;
        align-items: flex-start;
        padding: .75rem;
        min-width: 180px;

        display: none;
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-link {
        display: block;
        width: 100%;
        text-align: left;
        font-size: .9rem;
        padding: .75rem .8rem;
    }
}