:root {
    --ink: #142033;
    --muted: #5c6b7a;
    --line: #e3ebf1;
    --paper: #f4f7f8;
    --card: #ffffff;
    --navy: #12344d;
    --teal: #0f5c56;
    --teal-bright: #0f766e;
    --soft: #e7f3f1;
    --shadow: 0 12px 30px rgba(18, 52, 77, 0.06);
    --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--paper);
    font-family: var(--font);
    line-height: 1.65;
}

h1, h2, h3 {
    line-height: 1.25;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    margin: 0 0 0.6rem;
}

h2 {
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    margin: 2.2rem 0 0.8rem;
}

h3 {
    font-size: 1.05rem;
    margin: 0 0 0.35rem;
}

p {
    margin: 0 0 0.9rem;
}

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

.skip {
    position: absolute;
    left: 0.75rem;
    top: -3rem;
    background: var(--navy);
    color: #fff;
    padding: 0.4rem 0.7rem;
    z-index: 20;
}

.skip:focus {
    top: 0.75rem;
}

.site-header {
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    color: var(--navy);
    font-weight: 700;
    letter-spacing: -0.03em;
}

.brand:hover {
    color: var(--navy);
}

.nav-link.active {
    color: var(--teal);
    font-weight: 650;
}

.navbar .nav-link {
    display: flex;
    align-items: center;
    min-height: 40px;
}

.nav-tools {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.lang-switch {
    display: flex;
    align-items: stretch;
    height: 40px;
    border: 1px solid var(--line);
    border-radius: 999px;
    overflow: hidden;
    flex: none;
}

.lang-switch a {
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.92rem;
}

.lang-switch a[aria-current="true"] {
    background: var(--navy);
    color: #fff;
}

.search {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-nav {
    width: min(280px, 70vw);
}

.search-nav .search-submit {
    display: none;
}

.search-hero {
    margin: 1.25rem 0 0;
    max-width: 52rem;
}

.search-hero .form-control {
    flex: 1 1 auto;
    height: 52px;
    min-width: 0;
}

.search-submit {
    flex: none;
    white-space: nowrap;
}

.search-hero .search-submit {
    height: 52px;
    min-width: 7.5rem;
    padding-inline: 1.75rem;
}

.search-nav .form-control,
.lang-switch {
    height: 40px;
}

.search .form-control,
.filter-input {
    border-radius: 999px;
    border-color: #c9d7e2;
    min-height: 40px;
    padding-left: 1rem;
}

.search-panel {
    position: absolute;
    z-index: 30;
    left: 0;
    right: 0;
    top: calc(100% + 6px);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.search-hit {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 0.95rem;
    color: var(--ink);
    text-decoration: none;
}

.search-hit:hover {
    background: var(--soft);
}

.search-hit span {
    color: var(--muted);
    font-size: 0.92rem;
}

.hero {
    padding: 2.5rem 0 2rem;
    background:
        radial-gradient(circle at top right, rgba(15, 118, 110, 0.16), transparent 28%),
        linear-gradient(180deg, #e7eef3 0%, var(--paper) 100%);
}

.lead {
    font-size: 1.12rem;
    color: var(--muted);
}

.hero .lead {
    max-width: 40rem;
}

.eyebrow {
    margin: 0 0 0.4rem;
    color: var(--teal-bright);
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.78rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1rem;
}

.btn-primary {
    --bs-btn-bg: var(--teal);
    --bs-btn-border-color: var(--teal);
    --bs-btn-hover-bg: #0c4a45;
    --bs-btn-hover-border-color: #0c4a45;
}

.btn-outline-primary {
    --bs-btn-color: var(--teal);
    --bs-btn-border-color: var(--teal);
    --bs-btn-hover-bg: var(--teal);
    --bs-btn-hover-border-color: var(--teal);
}

.band {
    padding: 1.2rem 0 2.4rem;
}

.band-alt {
    background: #fff;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.section-head h2,
.band > .container > h2:first-child {
    margin: 0 0 1rem;
}

.section-head h2 {
    margin-bottom: 0;
}

.narrow {
    max-width: 1140px;
}

.ip-grid {
    display: grid;
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 0.85rem;
}

.ip-card {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    height: 100%;
    padding: 1.1rem 1.15rem 1rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    color: inherit;
    text-decoration: none;
}

.ip-card:hover {
    border-color: #b7d5d1;
    color: inherit;
}

.ip-card.is-main {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
}

.ip-card.is-main .ip-card-kicker,
.ip-card.is-main .ip-card-text {
    color: #c9ddd9;
}

.ip-card-kicker {
    color: var(--teal);
    font-size: 0.82rem;
    font-weight: 700;
}

.ip-card-title {
    font-size: 1.45rem;
    font-weight: 750;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
}

.ip-card-text {
    flex: 1 1 auto;
    color: var(--muted);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.ip-card-go {
    margin-top: auto;
    padding-top: 0.65rem;
    font-weight: 700;
    font-size: 0.92rem;
}

.steps {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1rem;
}

.step {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 1.15rem 1.25rem;
}

.step-copy {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    min-width: 0;
}

.step-body {
    min-width: 0;
}

.step-body h3,
.step-body p {
    margin: 0;
}

.step-body p {
    margin-top: 0.35rem;
}

.step-no {
    display: inline-grid;
    place-items: center;
    flex: none;
    width: 1.8rem;
    height: 1.8rem;
    margin-top: 0.05rem;
    border-radius: 999px;
    background: var(--soft);
    color: var(--teal);
    font-weight: 750;
}

.mock {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    width: 100%;
    margin: 0;
    min-width: 0;
}

.mock svg {
    width: 100%;
    height: auto;
    display: block;
}

.mock figcaption {
    margin: 0.45rem 0 0;
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.4;
    text-align: center;
}

.sheet {
    padding-bottom: 3rem;
}

.quick {
    background: var(--soft);
    border-radius: 16px;
    padding: 0.95rem 1rem;
    margin: 1rem 0;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.fine,
.disclaimer,
.reviewed,
.footer-note,
.footer-meta {
    color: var(--muted);
    font-size: 0.92rem;
}

.toc {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0 0.2rem;
}

.toc a {
    text-decoration: none;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.25rem 0.7rem;
}

.cred-table {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
}

.cred-table code {
    font-size: 0.95rem;
}

.copy-btn {
    margin-left: 0.35rem;
}

.ip-mini {
    font-variant-numeric: tabular-nums;
    font-size: 0.88rem;
}

.trouble-list {
    display: grid;
    gap: 0.75rem;
}

.trouble {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid #c2410c;
    border-radius: 14px;
    padding: 0.9rem 1rem;
}

.faq {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    margin-bottom: 0.55rem;
}

.faq summary {
    cursor: pointer;
    padding: 0.9rem 1rem;
    font-weight: 700;
}

.faq-a {
    padding: 0 1rem 0.2rem;
    color: var(--muted);
}

.link-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0;
    margin: 0 0 1rem;
    list-style: none;
}

.link-row a {
    display: inline-block;
    text-decoration: none;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.35rem 0.75rem;
}

.facts {
    display: grid;
    gap: 0.75rem;
    margin: 1rem 0 0;
}

.facts div {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0.8rem 1rem;
}

.facts dt {
    color: var(--muted);
    font-size: 0.82rem;
}

.facts dd {
    margin: 0.15rem 0 0;
}

.facts dd a {
    margin-right: 0.7rem;
}

.prose ul,
.prose ol {
    padding-left: 1.2rem;
}

.note {
    background: #fff8e8;
    border-radius: 14px;
    padding: 0.8rem 1rem;
}

.crumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    padding: 0;
    margin: 0 0 1rem;
    list-style: none;
    color: var(--muted);
    font-size: 0.92rem;
}

.crumb li:not(:last-child)::after {
    content: "/";
    margin-left: 0.35rem;
    color: #9aabba;
}

.results-label,
.empty-note,
.filter-label {
    color: var(--muted);
}

.filter-input {
    max-width: 420px;
    margin-bottom: 0.8rem;
}

.site-footer {
    background: var(--navy);
    color: #d5e2ea;
    padding: 2.2rem 0 1.2rem;
}

.site-footer a {
    display: block;
    color: #fff;
    text-decoration: none;
    margin-bottom: 0.35rem;
}

.footer-mark {
    display: block;
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 0.4rem;
}

.footer-meta,
.footer-copy {
    margin: 1.4rem 0 0;
    color: #9fb3c3;
}

.footer-copy {
    margin-top: 0.35rem;
}

@media (min-width: 800px) {
    .ip-grid {
        grid-template-columns: 1fr 1fr;
    }

    .ip-card.is-main {
        grid-column: span 2;
    }

    .step {
        grid-template-columns: minmax(0, 1fr) 300px;
        align-items: center;
    }

    .facts {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 991.98px) {
    .nav-tools {
        align-items: stretch;
        flex-direction: column;
        margin-top: 0.6rem;
    }

    .search-nav {
        width: 100%;
    }

    .search-nav .search-submit {
        display: inline-block;
    }
}