:root {
    --ink: #122033;
    --navy: #1c3d6e;
    --gold: #c8921a;
    --gold-soft: #f3d48a;
    --sand: #f4efe6;
    --paper: #fbf8f2;
    --line: #d8cfc0;
    --muted: #5d6b7a;
    --card: #fffdf8;
}

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

html {
    scrollbar-gutter: stable;
}

body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
    color: var(--ink);
    background-color: var(--paper);
    background-image:
        linear-gradient(180deg, rgba(251, 248, 242, 0.92) 0%, rgba(244, 239, 230, 0.96) 100%),
        url("../image/page-field.jpg");
    background-size: cover;
    background-position: center top;
    line-height: 1.65;
}

@media (max-width: 768px) {
    body {
        background-attachment: scroll;
    }
}

a {
    color: var(--navy);
}

a:hover {
    color: #8a6410;
}

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

.wrap {
    width: min(1120px, calc(100% - 36px));
    margin: 0 auto;
}

.topbar {
    background: var(--ink);
    color: #e8d9b0;
    font-size: 0.82rem;
}

.topbar-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 22px;
    padding: 8px 0;
}

.topbar a {
    color: #f3d48a;
    text-decoration: none;
}

.masthead {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(251, 248, 242, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    flex-wrap: wrap;
}

.brand {
    text-decoration: none;
    color: var(--ink);
}

.brand strong {
    display: block;
    font-size: 1.28rem;
    letter-spacing: 0.08em;
}

.brand small {
    display: block;
    color: var(--muted);
    font-size: 0.75rem;
    margin-top: 2px;
}

.primary-nav ul {
    display: flex;
    gap: 22px;
    list-style: none;
    flex-wrap: wrap;
}

.primary-nav a {
    text-decoration: none;
    color: #334155;
    font-weight: 600;
    font-size: 0.94rem;
    border-bottom: 2px solid transparent;
    padding-bottom: 3px;
}

.primary-nav a:hover,
.primary-nav a.is-current {
    color: var(--navy);
    border-bottom-color: var(--gold);
}

.nav-toggle {
    display: none;
    border: 1px solid var(--navy);
    background: #fff;
    color: var(--navy);
    border-radius: 999px;
    padding: 8px 16px;
    font: inherit;
    cursor: pointer;
}

@media (max-width: 900px) {
    .nav-toggle {
        display: inline-flex;
    }

    .primary-nav {
        display: none;
        width: 100%;
        border-top: 1px solid var(--line);
        padding-top: 12px;
    }

    .primary-nav.is-open {
        display: block;
    }

    .primary-nav ul {
        flex-direction: column;
        gap: 12px;
    }
}

.hero {
    min-height: clamp(300px, 48vh, 560px);
    background-image:
        linear-gradient(115deg, rgba(16, 28, 46, 0.86), rgba(28, 61, 110, 0.55)),
        url("../image/hero-track.jpg");
    background-size: cover;
    background-position: center;
    color: #fff;
    display: flex;
    align-items: center;
}

.hero-copy {
    padding: 72px 0;
    max-width: 720px;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 12px;
    padding: 4px 10px;
    border: 1px solid rgba(243, 212, 138, 0.7);
    color: var(--gold-soft);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
}

.hero h1 {
    font-size: clamp(1.8rem, 4.4vw, 2.7rem);
    line-height: 1.25;
    font-weight: 700;
}

.hero p {
    margin: 16px 0 22px;
    color: #e8e2d4;
    font-size: 1.05rem;
}

.action-row,
.chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn {
    display: inline-block;
    text-decoration: none;
    border-radius: 4px;
    padding: 11px 20px;
    font-weight: 700;
    border: 1px solid transparent;
}

.btn-gold {
    background: var(--gold);
    color: #1b1406 !important;
    border-color: #e0b44a;
}

.btn-ghost {
    background: transparent;
    color: #fff !important;
    border-color: #f3d48a;
}

.chip {
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(243, 212, 138, 0.35);
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 0.86rem;
    color: #f6edd6;
}

.section {
    padding: 68px 0;
    scroll-margin-top: 88px;
}

.section-deferred {
    content-visibility: auto;
    contain-intrinsic-size: 1px 720px;
}

.section-head {
    margin-bottom: 28px;
}

.section-head h2 {
    font-size: 1.7rem;
    line-height: 1.3;
}

.section-head h2::after {
    content: "";
    display: block;
    width: 56px;
    height: 3px;
    margin-top: 10px;
    background: var(--gold);
}

.section-head p {
    color: var(--muted);
    margin-top: 10px;
    max-width: 640px;
}

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

.gear-card {
    background: var(--card);
    border: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.gear-card:hover {
    border-color: var(--gold);
}

.gear-photo {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: #1a2330;
}

.gear-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.gear-body {
    padding: 16px 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.tag {
    align-self: flex-start;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--navy);
    background: #e8eef7;
    padding: 2px 8px;
}

.gear-body h3 {
    font-size: 1.08rem;
}

.gear-body p {
    color: #4b5a6a;
    font-size: 0.92rem;
}

.link-more {
    margin-top: auto;
    font-weight: 700;
    text-decoration: none;
    color: var(--navy);
}

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.filter-bar button {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink);
    padding: 7px 14px;
    font: inherit;
    cursor: pointer;
}

.filter-bar button.is-on {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
}

.panel-grid,
.story-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.panel,
.story {
    background: var(--card);
    border: 1px solid var(--line);
    padding: 18px;
}

.panel h3,
.story h3 {
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.panel p,
.story p {
    color: #4d5c6b;
    font-size: 0.93rem;
}

.split {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
    align-items: center;
}

.split img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    border: 1px solid var(--line);
}

.contact-box {
    background: var(--ink);
    color: #efe7d4;
    padding: 28px;
}

.contact-box h2 {
    color: #fff;
}

.contact-box h2::after {
    background: var(--gold);
}

.contact-box p,
.contact-box li {
    color: #d9d0bc;
}

.contact-box a {
    color: var(--gold-soft);
}

.contact-list {
    list-style: none;
    margin: 16px 0 20px;
}

.contact-list li {
    margin: 8px 0;
}

.article {
    max-width: 820px;
    margin: 0 auto;
}

.article h1 {
    font-size: 1.9rem;
    margin-bottom: 12px;
}

.article h2 {
    font-size: 1.25rem;
    margin: 28px 0 10px;
}

.article p,
.article li {
    color: #3d4b59;
    margin-bottom: 12px;
}

.article ul {
    padding-left: 1.2rem;
}

.article img.detail-shot {
    width: 100%;
    height: 420px;
    object-fit: cover;
    border: 1px solid var(--line);
    margin: 8px 0 18px;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 22px;
    font-size: 0.92rem;
}

.spec-table th,
.spec-table td {
    border: 1px solid var(--line);
    padding: 10px 12px;
    text-align: left;
}

.spec-table th {
    width: 30%;
    background: #efe8d8;
}

.crumbs {
    font-size: 0.86rem;
    color: var(--muted);
    margin-bottom: 18px;
}

.crumbs a {
    text-decoration: none;
}

.site-footer {
    background: #101924;
    color: #c9c0ad;
    padding: 36px 0 22px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.8fr 1.1fr;
    gap: 24px;
}

.site-footer h3 {
    color: #f4ead2;
    font-size: 1rem;
    margin-bottom: 10px;
}

.site-footer a {
    color: #e8d39a;
    text-decoration: none;
}

.site-footer p,
.site-footer li {
    font-size: 0.88rem;
    line-height: 1.7;
}

.site-footer ul {
    list-style: none;
}

.legal-row {
    margin-top: 22px;
    padding-top: 14px;
    border-top: 1px solid #2a3544;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
    font-size: 0.8rem;
}

@media (max-width: 900px) {
    .gear-grid,
    .split,
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .wrap {
        width: calc(100% - 28px);
    }

    .section {
        padding: 44px 0;
    }

    .section-deferred {
        contain-intrinsic-size: 1px 580px;
    }

    .gear-grid,
    .split,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .split img,
    .article img.detail-shot {
        height: 240px;
    }

    .hero-copy {
        padding: 48px 0;
    }
}