:root {
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-surface-alt: #f8fafc;
    --color-text: #0f172a;
    --color-muted: #475569;
    --color-border: #e2e8f0;
    --color-primary: #088868;
    --color-primary-600: #066C53;
    --shadow-elevated: 0 8px 30px rgba(2, 6, 23, 0.08);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0b1220;
        --color-surface: #0f172a;
        --color-surface-alt: #111827;
        --color-text: #e5e7eb;
        --color-muted: #94a3b8;
        --color-border: #1f2937;
        --shadow-elevated: 0 8px 30px rgba(0, 0, 0, 0.35);
    }
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-text);
    background: var(--color-bg);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
    line-height: 1.6;
    overflow-x: hidden;
}

img, svg, video {
    max-width: 100%;
    height: auto;
}

.container {
    width: 100%;
    max-width: 1120px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 20px;
    padding-right: 20px;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.skip-link:focus {
    left: 20px;
    top: 20px;
    width: auto;
    height: auto;
    padding: 8px 12px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 8px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--color-bg), transparent 12%);
    backdrop-filter: saturate(160%) blur(8px);
    border-bottom: 1px solid color-mix(in srgb, var(--color-border), transparent 50%);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.site-header.is-sticky .header-inner {
    height: 64px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: inherit;
    text-decoration: none;
}

.brand-logo {
    width: 32px;
    height: 32px;
    display: block;
    object-fit: contain;
    border-radius: 8px;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-600));
    color: #fff;
    font-weight: 700;
}

.brand-text {
    font-weight: 700;
}

.site-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 24px;
}

.site-nav a {
    color: inherit;
    text-decoration: none;
    font-weight: 500;
}

.site-nav a:hover {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    background: transparent;
    border: 0;
    padding: 8px;
    border-radius: 8px;
}

.nav-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.nav-toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    margin: 5px 0;
    background: currentColor;
}

@media (max-width: 920px) {
    .nav-toggle {
        display: inline-block;
    }

    .site-nav {
        position: fixed;
        inset: 0 0 0 40%;
        background: var(--color-surface);
        border-left: 1px solid var(--color-border);
        transform: translateX(100%);
        transition: transform 260ms ease;
        padding: 20px;
    }

    .site-nav ul {
        flex-direction: column;
        gap: 16px;
    }

    .site-nav.is-open {
        transform: translateX(0%);
    }
}

.hero {
    position: relative;
    padding: 96px 0 72px 0;
    background: radial-gradient(1200px 600px at 10% -10%, color-mix(in srgb, var(--color-primary), transparent 65%), transparent),
                linear-gradient(180deg, color-mix(in srgb, var(--color-surface-alt), transparent 0%), var(--color-bg));
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 32px;
    align-items: center;
}

@media (max-width: 920px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.hero-content h1 {
    margin: 0 0 12px 0;
    font-size: clamp(32px, 6vw, 48px);
    line-height: 1.15;
}

.hero-content p {
    margin: 0 0 20px 0;
    color: var(--color-muted);
}

.hero-cta {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    list-style: none;
    margin: 0;
    padding: 0;
}

@media (max-width: 480px) {
    .hero-stats {
        grid-template-columns: 1fr 1fr;
    }
}

.hero-stats li {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 12px 14px;
    box-shadow: var(--shadow-elevated);
    display: grid;
}

.hero-stats strong {
    font-size: 20px;
}

.hero-visual {
    position: relative;
    min-height: 300px;
}

.visual-blob {
    position: absolute;
    inset: 10% 10% 20% 0;
    background: conic-gradient(from 180deg at 50% 50%, color-mix(in srgb, var(--color-primary), transparent 10%), color-mix(in srgb, var(--color-primary-600), transparent 10%), transparent 60%);
    filter: blur(40px) saturate(120%);
    opacity: 0.6;
    border-radius: 50% 30% 60% 40% / 40% 60% 30% 50%;
}

.visual-grid {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(to right, color-mix(in srgb, var(--color-border), transparent 50%) 1px, transparent 1px),
                      linear-gradient(to bottom, color-mix(in srgb, var(--color-border), transparent 50%) 1px, transparent 1px);
    background-size: 24px 24px;
    border-radius: 16px;
    mask-image: radial-gradient(400px 300px at 60% 40%, black 60%, transparent 100%);
}

.section {
    padding: 72px 0;
    background: var(--color-surface);
}

.section.alt {
    background: var(--color-surface-alt);
}

.section h2 {
    margin: 0 0 8px 0;
    font-size: 28px;
}

.section-subtitle {
    margin: 0 0 28px 0;
    color: var(--color-muted);
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

@media (max-width: 1100px) {
    .cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .cards {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    padding: 20px;
    box-shadow: var(--shadow-elevated);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 8px;
}

.card p {
    margin-top: 0;
    color: var(--color-muted);
}

.card ul {
    margin: 12px 0 0 18px;
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

@media (max-width: 920px) {
    .case-grid {
        grid-template-columns: 1fr;
    }
}

.case {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    padding: 20px;
    box-shadow: var(--shadow-elevated);
}

.case-badge {
    display: inline-block;
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-primary), white 80%);
    color: var(--color-primary-600);
    margin-bottom: 8px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 28px;
    align-items: center;
}

@media (max-width: 920px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}

.feature-list {
    margin: 12px 0 20px 18px;
}

.logos {
    display: flex;
    gap: 8px;
    color: color-mix(in srgb, var(--color-muted), transparent 10%);
}

.logo-dot {
    font-size: 24px;
}

.about-visual {
    position: relative;
    min-height: 280px;
}

@media (max-width: 480px) {
    .about-visual {
        min-height: 220px;
    }
    .robot {
        transform: scale(0.85);
        transform-origin: center top;
    }
}

/* 设备类名定制：移动端底部更贴左对齐 */
.is-mobile .footer-inner {
    grid-template-columns: 1fr;
    text-align: left;
}
.is-mobile .footer-links {
    justify-content: flex-start;
}
.is-mobile .footer-brand {
    justify-content: flex-start;
}

.is-mobile .contact-grid {
    grid-template-columns: 1fr;
}
.is-mobile .contact-aside {
    grid-template-columns: 1fr 1fr;
}
@media (max-width: 640px) {
    .is-mobile .contact-aside {
        grid-template-columns: 1fr;
    }
}

/* 移动端整体左右留白，避免元素贴边 */
.is-mobile .container {
    padding-left: 24px;
    padding-right: 24px;
}

.robot-illustration {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    border: 1px dashed var(--color-border);
    border-radius: 16px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--color-surface-alt), transparent 0%), transparent 60%);
}

.robot-shadow {
    position: absolute;
    bottom: 24px;
    width: 48%;
    height: 12px;
    background: radial-gradient(60% 100% at 50% 50%, color-mix(in srgb, var(--color-border), transparent 40%), transparent 100%);
    filter: blur(2px);
}

.robot {
    position: relative;
    width: 160px;
}

.robot-head {
    position: relative;
    width: 120px;
    height: 72px;
    margin: 0 auto 8px auto;
    border-radius: 16px;
    background: linear-gradient(135deg, color-mix(in srgb, var(--color-primary), transparent 10%), color-mix(in srgb, var(--color-primary-600), transparent 10%));
}

.robot-eye {
    position: absolute;
    top: 26px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary), transparent 60%);
}

.robot-eye.left { left: 30px; }
.robot-eye.right { right: 30px; }

.robot-antenna {
    position: absolute;
    top: -16px;
    left: 50%;
    width: 2px;
    height: 16px;
    transform: translateX(-50%);
    background: color-mix(in srgb, var(--color-primary-600), transparent 20%);
}

.robot-body {
    width: 140px;
    height: 120px;
    margin: 0 auto;
    border-radius: 16px;
    background: linear-gradient(180deg, var(--color-surface), color-mix(in srgb, var(--color-primary), transparent 92%));
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-elevated);
}

.robot-chest {
    width: 56px;
    height: 36px;
    margin: 14px auto 0 auto;
    border-radius: 8px;
    background: color-mix(in srgb, var(--color-primary), transparent 70%);
}

.robot-arms {
    position: relative;
    height: 0;
}

.robot-arm {
    position: absolute;
    top: -80px;
    width: 20px;
    height: 80px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--color-primary), transparent 70%);
}

.robot-arm.left { left: 8px; }
.robot-arm.right { right: 8px; }

.robot-legs {
    position: relative;
    width: 120px;
    margin: 8px auto 0 auto;
    height: 40px;
}

.robot-leg {
    position: absolute;
    width: 22px;
    height: 40px;
    bottom: 0;
    border-radius: 8px;
    background: color-mix(in srgb, var(--color-primary-600), transparent 70%);
}

.robot-leg.left { left: 28px; }
.robot-leg.right { right: 28px; }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
}

@media (max-width: 920px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

.form-field {
    display: grid;
    gap: 8px;
    margin-bottom: 14px;
}

label {
    font-weight: 600;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
}

input::placeholder,
textarea::placeholder {
    color: color-mix(in srgb, var(--color-muted), transparent 20%);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 42px;
    padding: 0 16px;
    border-radius: 10px;
    border: 1px solid transparent;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 60ms ease;
}

.button:active {
    transform: translateY(1px);
}

.button-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-600));
    color: #fff;
}

.button-primary:hover {
    filter: brightness(1.05);
}

.button-ghost {
    background: transparent;
    color: var(--color-primary);
    border-color: color-mix(in srgb, var(--color-primary), transparent 60%);
}

.button-ghost:hover {
    background: color-mix(in srgb, var(--color-primary), transparent 90%);
}

.contact-aside {
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr 1fr;
}

@media (max-width: 640px) {
    .contact-aside {
        grid-template-columns: 1fr;
    }
}

.contact-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 16px;
}

.contact-card p {
    word-break: break-word;
}

.form-status {
    min-height: 20px;
    margin-top: 8px;
    color: var(--color-muted);
}

.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 16px;
    padding: 20px 0;
}

@media (max-width: 720px) {
    .footer-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.footer-links {
    display: flex;
    gap: 16px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links a {
    color: inherit;
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-primary);
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}