:root {
    --bg: #111312;
    --bg-soft: #171a18;
    --surface: rgba(24, 27, 25, 0.9);
    --surface-strong: #1d211f;
    --line: rgba(198, 216, 107, 0.18);
    --line-strong: rgba(198, 216, 107, 0.34);
    --text: #f2eee6;
    --muted: #b5aea0;
    --accent: #c6d86b;
    --accent-deep: #879750;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.22);
    --container: 1180px;
    --radius: 12px;
    --transition: 180ms ease;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(198, 216, 107, 0.08), transparent 30%),
        radial-gradient(circle at right 20%, rgba(135, 151, 80, 0.12), transparent 26%),
        linear-gradient(180deg, #0f1110 0%, #111312 38%, #141715 100%);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(198, 216, 107, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(198, 216, 107, 0.05) 1px, transparent 1px);
    background-size: 36px 36px;
    mask-image: radial-gradient(circle at center, black 18%, transparent 74%);
    pointer-events: none;
    opacity: 0.35;
    z-index: -1;
}

a {
    color: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.container {
    width: min(calc(100% - 40px), var(--container));
    margin: 0 auto;
}

.section {
    padding: 112px 0;
}

.section-alt {
    background: linear-gradient(180deg, rgba(24, 27, 25, 0.64), rgba(24, 27, 25, 0.28));
    border-top: 1px solid rgba(198, 216, 107, 0.08);
    border-bottom: 1px solid rgba(198, 216, 107, 0.08);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(16px);
    background: rgba(17, 19, 18, 0.72);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition);
}

.site-header.is-scrolled {
    border-bottom-color: rgba(198, 216, 107, 0.12);
    background: rgba(17, 19, 18, 0.92);
}

.header-inner {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 76px;
    gap: 24px;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    font-family: "Avenir Next", "Helvetica Neue", sans-serif;
    font-size: 0.92rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    background: rgba(198, 216, 107, 0.06);
}

.brand-text {
    display: grid;
    gap: 2px;
}

.brand-text strong,
.brand-text span,
.hero-intro,
h1,
h2,
h3,
.reliability-item span {
    font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

.brand-text strong {
    font-size: 1.02rem;
    font-weight: 700;
}

.brand-text span {
    color: var(--muted);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.site-nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a:focus-visible {
    color: var(--text);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid rgba(198, 216, 107, 0.18);
    border-radius: 10px;
    background: rgba(198, 216, 107, 0.05);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 4px auto;
    background: var(--text);
    transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.hero {
    padding-top: 72px;
    min-height: calc(100dvh - 76px);
    display: flex;
    align-items: center;
}

.hero-layout,
.split-layout,
.reliability-layout,
.about-layout {
    display: grid;
    gap: 32px;
}

.hero-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(340px, 0.9fr);
    align-items: stretch;
}

.hero-copy,
.hero-panel,
.card,
.scenario-item,
.reliability-item,
.about-content {
    position: relative;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}

.hero-copy {
    padding: 48px;
    overflow: hidden;
}

.hero-copy::after,
.hero-panel::after,
.about-content::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(198, 216, 107, 0.08), transparent 42%);
    pointer-events: none;
}

.hero-intro {
    margin: 0 0 18px;
    color: var(--accent);
    font-size: 0.98rem;
    letter-spacing: 0.08em;
}

h1 {
    margin: 0;
    max-width: 12ch;
    font-size: clamp(2.7rem, 6vw, 5.2rem);
    line-height: 0.95;
    letter-spacing: -0.04em;
}

.hero-summary,
.section-heading p,
.card p,
.scenario-item p,
.reliability-item p,
.about-content p,
.footer-inner p {
    color: var(--muted);
}

.hero-summary {
    max-width: 58ch;
    margin: 26px 0 0;
    font-size: 1.06rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin: 30px 0 34px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 20px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid transparent;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.button-primary {
    color: #0f1110;
    background: var(--accent);
}

.button-primary:hover,
.button-primary:focus-visible {
    background: #d5e580;
}

.button-secondary {
    border-color: rgba(198, 216, 107, 0.22);
    background: rgba(198, 216, 107, 0.05);
}

.button-secondary:hover,
.button-secondary:focus-visible {
    border-color: rgba(198, 216, 107, 0.44);
    background: rgba(198, 216, 107, 0.1);
}

.hero-list,
.about-points {
    margin: 0;
    padding: 0;
    list-style: none;
}

.hero-list {
    display: grid;
    gap: 12px;
}

.hero-list li,
.about-points li {
    position: relative;
    padding-left: 18px;
    color: var(--text);
}

.hero-list li::before,
.about-points li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 999px;
    transform: translateY(-50%);
}

.hero-panel {
    padding: 28px;
    display: grid;
    gap: 24px;
}

.panel-block {
    padding-bottom: 18px;
    border-bottom: 1px solid rgba(198, 216, 107, 0.12);
}

.panel-block p,
.panel-grid p,
.reliability-item span {
    margin: 0;
}

.panel-block p,
.panel-grid span {
    color: var(--accent);
}

.panel-block strong {
    display: block;
    margin-top: 10px;
    font-size: 1.34rem;
}

.panel-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.panel-grid div {
    padding: 18px 16px;
    border: 1px solid rgba(198, 216, 107, 0.12);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.01);
}

.panel-grid span,
.reliability-item span {
    display: inline-block;
    margin-bottom: 10px;
    font-size: 0.82rem;
    letter-spacing: 0.1em;
}

.panel-grid strong {
    display: block;
    margin-bottom: 8px;
    font-size: 1rem;
}

.panel-grid p {
    color: var(--muted);
    font-size: 0.92rem;
}

.section-heading {
    max-width: 700px;
    margin-bottom: 32px;
}

h2 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.03em;
}

.section-heading p {
    margin: 14px 0 0;
    font-size: 1rem;
}

.card-grid,
.scenario-list,
.reliability-board {
    display: grid;
    gap: 18px;
}

.card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card,
.scenario-item {
    padding: 28px;
}

.card h3,
.scenario-item h3,
.reliability-item h3 {
    margin: 0 0 12px;
    font-size: 1.16rem;
}

.card p,
.scenario-item p,
.reliability-item p,
.about-content p {
    margin: 0;
}

.split-layout {
    grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
    align-items: start;
}

.scenario-list,
.reliability-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.reliability-layout,
.about-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
}

.reliability-item {
    display: flex;
    gap: 18px;
    padding: 24px;
}

.reliability-item span {
    min-width: 40px;
    color: var(--accent);
}

.about-content {
    padding: 32px;
}

.about-content p + p {
    margin-top: 18px;
}

.about-points {
    display: grid;
    gap: 12px;
    margin-top: 24px;
}

.site-footer {
    padding: 28px 0 36px;
}

.footer-inner {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    padding-top: 26px;
    border-top: 1px solid rgba(198, 216, 107, 0.12);
}

.footer-inner strong {
    display: block;
    margin-bottom: 6px;
}

.footer-inner p {
    margin: 0;
    font-size: 0.92rem;
}

.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 500ms ease, transform 500ms ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 980px) {
    .hero-layout,
    .split-layout,
    .reliability-layout,
    .about-layout,
    .card-grid,
    .scenario-list,
    .reliability-board,
    .panel-grid {
        grid-template-columns: 1fr;
    }

    .hero-copy {
        padding: 40px 28px;
    }
}

@media (max-width: 760px) {
    .section {
        padding: 88px 0;
    }

    .header-inner {
        min-height: 68px;
    }

    .menu-toggle {
        display: inline-block;
    }

    .site-nav {
        position: absolute;
        top: calc(100% + 10px);
        right: 20px;
        left: 20px;
        display: grid;
        gap: 4px;
        padding: 12px;
        border: 1px solid rgba(198, 216, 107, 0.14);
        border-radius: 12px;
        background: rgba(24, 27, 25, 0.96);
        box-shadow: var(--shadow);
        opacity: 0;
        pointer-events: none;
        transform: translateY(-8px);
        transition: opacity var(--transition), transform var(--transition);
    }

    .site-nav.is-open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .site-nav a {
        padding: 12px 10px;
    }

    h1 {
        max-width: none;
        font-size: clamp(2.3rem, 12vw, 3.5rem);
    }

    .hero-summary {
        font-size: 1rem;
    }

    .hero-copy,
    .hero-panel,
    .card,
    .scenario-item,
    .reliability-item,
    .about-content {
        padding-inline: 22px;
    }

    .footer-inner {
        flex-direction: column;
        align-items: start;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}