:root {
    --green-900: #16362e;
    --green-800: #1f4a3f;
    --green-700: #2c6655;
    --green-100: #e7f0e8;
    --sand-50: #fbf7ed;
    --sand-100: #efe4cf;
    --sand-200: #e0ceb1;
    --gray-900: #222725;
    --gray-700: #505955;
    --gray-500: #727b75;
    --line: rgba(31, 74, 63, .16);
    --shadow: 0 18px 46px rgba(18, 45, 38, .12);
    --radius-xl: 28px;
    --radius-lg: 18px;
    --radius-md: 12px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--gray-900);
    background: var(--sand-50);
    line-height: 1.72;
}

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

a {
    color: inherit;
    text-decoration: none;
}

p {
    margin: 0 0 1rem;
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.22;
    color: var(--green-900);
}

button,
input,
textarea,
select {
    font: inherit;
}

.container {
    width: min(1160px, calc(100% - 36px));
    margin: 0 auto;
}

.skip-link {
    position: absolute;
    left: 18px;
    top: -60px;
    background: var(--green-900);
    color: #fff;
    padding: 10px 14px;
    border-radius: 8px;
    z-index: 100;
}

.skip-link:focus {
    top: 12px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(251, 247, 237, .88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}

.nav-wrap {
    min-height: 74px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    color: var(--green-900);
}

.brand-mark {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    background: var(--green-900);
    color: var(--sand-50);
    letter-spacing: -1px;
}

.brand-text {
    font-size: 1.18rem;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--gray-700);
    font-size: .96rem;
}

.site-nav a {
    padding: 10px 13px;
    border-radius: 999px;
    transition: background .2s ease, color .2s ease;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--green-900);
    background: var(--green-100);
}

.nav-toggle {
    display: none;
    border: 1px solid var(--line);
    background: #fff8ec;
    color: var(--green-900);
    width: 42px;
    height: 42px;
    border-radius: 12px;
}

.hero {
    position: relative;
    padding: 82px 0 56px;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -160px -20% auto -20%;
    height: 460px;
    background: radial-gradient(circle at 30% 40%, rgba(224, 206, 177, .84), transparent 28%), radial-gradient(circle at 70% 20%, rgba(44, 102, 85, .16), transparent 34%);
    pointer-events: none;
}

.hero-grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
    gap: 48px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--green-700);
    background: rgba(44, 102, 85, .1);
    border: 1px solid rgba(44, 102, 85, .14);
    padding: 7px 12px;
    border-radius: 999px;
    font-size: .92rem;
    margin-bottom: 18px;
}

.eyebrow::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green-700);
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 5.3rem);
    letter-spacing: -3px;
    max-width: 760px;
}

.hero-lead {
    margin-top: 24px;
    color: var(--gray-700);
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    max-width: 720px;
}

.hero-actions,
.section-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 46px;
    border-radius: 999px;
    padding: 10px 18px;
    border: 1px solid transparent;
    font-weight: 700;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--green-900);
    color: var(--sand-50);
    box-shadow: 0 12px 28px rgba(22, 54, 46, .2);
}

.btn-soft {
    background: #fff8ec;
    border-color: var(--line);
    color: var(--green-900);
}

.hero-panel,
.feature-panel,
.form-panel,
.contact-card {
    background: rgba(255, 251, 243, .82);
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
}

.hero-panel {
    padding: 24px;
}

.hero-panel img {
    width: 100%;
    border-radius: 22px;
    background: var(--green-100);
}

.panel-note {
    margin: 16px 4px 0;
    color: var(--gray-700);
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-top: 28px;
}

.stat-card {
    background: rgba(255, 255, 255, .62);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 18px;
}

.stat-card strong {
    display: block;
    color: var(--green-900);
    font-size: 1.6rem;
}

.stat-card span {
    color: var(--gray-700);
    font-size: .92rem;
}

.section {
    padding: 72px 0;
}

.section.alt {
    background: linear-gradient(180deg, rgba(231, 240, 232, .5), rgba(251, 247, 237, 0));
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 28px;
    margin-bottom: 30px;
}

.section-head h2 {
    font-size: clamp(1.8rem, 3.6vw, 3rem);
    letter-spacing: -1px;
}

.section-head p {
    color: var(--gray-700);
    max-width: 560px;
    margin: 12px 0 0;
}

.grid-3,
.grid-4,
.grid-2 {
    display: grid;
    gap: 20px;
}

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

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
    background: rgba(255, 251, 243, .82);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: 0 10px 32px rgba(18, 45, 38, .07);
    min-height: 100%;
}

.card.with-image {
    padding: 0;
    overflow: hidden;
}

.card.with-image .card-body {
    padding: 20px;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.card p,
.card li {
    color: var(--gray-700);
}

.card ul,
.clean-list {
    padding-left: 20px;
    margin: 12px 0 0;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--green-100);
    color: var(--green-800);
    font-size: .84rem;
    font-weight: 700;
}

.card-info {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--gray-500);
    font-size: .9rem;
    margin-top: 14px;
}

.card-info span {
    background: rgba(224, 206, 177, .35);
    border-radius: 999px;
    padding: 4px 9px;
}

.feature-row {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 32px;
    align-items: center;
}

.feature-panel {
    padding: 28px;
}

.timeline {
    position: relative;
    display: grid;
    gap: 18px;
}

.timeline-item {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 16px;
    align-items: start;
}

.timeline-dot {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--green-900);
    color: var(--sand-50);
    font-weight: 800;
}

.topic-map {
    background: var(--green-900);
    color: var(--sand-50);
    border-radius: var(--radius-xl);
    padding: 28px;
    position: relative;
    overflow: hidden;
}

.topic-map h2,
.topic-map h3 {
    color: var(--sand-50);
}

.topic-map p {
    color: rgba(251, 247, 237, .78);
}

.topic-map::after {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    right: -70px;
    top: -80px;
    border-radius: 50%;
    background: rgba(224, 206, 177, .15);
}

.topic-nodes {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    position: relative;
    z-index: 1;
}

.topic-nodes span {
    border: 1px solid rgba(251, 247, 237, .24);
    background: rgba(255, 255, 255, .06);
    color: var(--sand-50);
    padding: 8px 12px;
    border-radius: 999px;
}

.video-list {
    display: grid;
    gap: 14px;
}

.video-row {
    display: grid;
    grid-template-columns: 142px 1fr;
    gap: 16px;
    background: rgba(255, 251, 243, .82);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 12px;
}

.video-row img {
    border-radius: 14px;
    height: 94px;
    width: 142px;
    object-fit: cover;
}

.video-row h3 {
    font-size: 1.08rem;
    margin-bottom: 4px;
}

.video-row p {
    color: var(--gray-700);
    margin-bottom: 6px;
}

.faq {
    display: grid;
    gap: 14px;
}

.faq details {
    background: rgba(255, 251, 243, .82);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
}

.faq summary {
    cursor: pointer;
    color: var(--green-900);
    font-weight: 800;
}

.faq p {
    margin: 12px 0 0;
    color: var(--gray-700);
}

.page-hero {
    padding: 70px 0 40px;
}

.page-hero .container {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 36px;
    align-items: center;
}

.page-hero h1 {
    font-size: clamp(2.1rem, 5vw, 4.3rem);
    letter-spacing: -2px;
}

.page-hero p {
    color: var(--gray-700);
    max-width: 760px;
    font-size: 1.12rem;
    margin-top: 18px;
}

.page-hero img {
    border-radius: var(--radius-xl);
    background: var(--green-100);
    border: 1px solid var(--line);
}

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

.filter-chip {
    border: 1px solid var(--line);
    background: #fff8ec;
    color: var(--green-900);
    border-radius: 999px;
    padding: 8px 14px;
    cursor: pointer;
}

.filter-chip.active {
    background: var(--green-900);
    color: var(--sand-50);
}

.form-panel {
    padding: 24px;
}

.form-grid {
    display: grid;
    gap: 14px;
}

.form-grid label {
    display: grid;
    gap: 6px;
    color: var(--green-900);
    font-weight: 700;
}

.form-grid input,
.form-grid textarea,
.form-grid select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 13px;
    background: #fffdf8;
    color: var(--gray-900);
}

.form-grid textarea {
    min-height: 136px;
    resize: vertical;
}

.notice {
    background: rgba(44, 102, 85, .09);
    border: 1px solid rgba(44, 102, 85, .18);
    color: var(--green-900);
    border-radius: var(--radius-lg);
    padding: 16px 18px;
}

.site-footer {
    margin-top: 48px;
    background: var(--green-900);
    color: var(--sand-50);
    padding: 42px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr .9fr 1.3fr .9fr;
    gap: 24px;
}

.site-footer p {
    color: rgba(251, 247, 237, .74);
    margin: 8px 0 0;
}

.footer-label {
    color: var(--sand-200);
    font-size: .86rem;
}

.domain-line {
    word-break: break-all;
}

.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity .6s ease, transform .6s ease;
}

.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 960px) {
    .hero-grid,
    .feature-row,
    .page-hero .container,
    .grid-2,
    .grid-3,
    .grid-4,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .stats-row {
        grid-template-columns: repeat(3, 1fr);
    }

    .site-nav {
        position: absolute;
        left: 18px;
        right: 18px;
        top: 74px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        background: #fff8ec;
        border: 1px solid var(--line);
        border-radius: 18px;
        padding: 10px;
        box-shadow: var(--shadow);
    }

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

    .site-nav a {
        border-radius: 12px;
    }

    .nav-toggle {
        display: grid;
        place-items: center;
    }
}

@media (max-width: 640px) {
    .container {
        width: min(100% - 24px, 1160px);
    }

    .hero {
        padding-top: 52px;
    }

    .hero h1,
    .page-hero h1 {
        letter-spacing: -1.4px;
    }

    .section,
    .page-hero {
        padding: 48px 0;
    }

    .section-head {
        display: block;
    }

    .stats-row {
        grid-template-columns: 1fr;
    }

    .video-row {
        grid-template-columns: 1fr;
    }

    .video-row img {
        width: 100%;
        height: auto;
    }
}