:root {
    --ink: #1f2a27;
    --deep: #18372f;
    --deep-2: #0e241f;
    --moss: #42685a;
    --sage: #e6eee4;
    --cream: #f6f0e4;
    --paper: #fffaf1;
    --line: rgba(31, 42, 39, .12);
    --muted: #65716c;
    --shadow: 0 20px 60px rgba(24, 55, 47, .12);
    --radius: 24px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.75;
}

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

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

.container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.narrow {
    width: min(860px, calc(100% - 40px));
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 250, 241, .92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}

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

.brand-link {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 46px;
    height: 46px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    color: var(--cream);
    background: linear-gradient(135deg, var(--deep), var(--moss));
    font-weight: 800;
    letter-spacing: .02em;
}

.brand-text {
    display: grid;
    line-height: 1.2;
}

.brand-text strong {
    font-size: 19px;
}

.brand-text small {
    color: var(--muted);
    font-size: 12px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.main-nav a {
    padding: 10px 14px;
    border-radius: 999px;
    color: var(--muted);
    font-size: 15px;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--deep);
    background: var(--sage);
}

.menu-toggle {
    display: none;
    border: 0;
    background: transparent;
    padding: 8px;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    margin: 5px 0;
    background: var(--deep);
    border-radius: 2px;
}

.hero {
    position: relative;
    padding: 86px 0 72px;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 20%, rgba(66, 104, 90, .18), transparent 30%),
        radial-gradient(circle at 70% 10%, rgba(227, 198, 143, .24), transparent 26%),
        linear-gradient(180deg, #fffaf1 0%, #eef4e9 100%);
    z-index: -2;
}

.hero::after {
    content: "";
    position: absolute;
    left: -8%;
    bottom: -35%;
    width: 560px;
    height: 560px;
    border-radius: 50%;
    background: rgba(24, 55, 47, .08);
    z-index: -1;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr);
    gap: 56px;
    align-items: center;
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--moss);
    font-weight: 700;
    letter-spacing: .08em;
    font-size: 14px;
}

h1,
h2,
h3 {
    line-height: 1.25;
    color: var(--deep-2);
    margin: 0;
}

h1 {
    font-size: clamp(38px, 6vw, 70px);
    letter-spacing: -.05em;
}

h2 {
    font-size: clamp(26px, 3.6vw, 42px);
    letter-spacing: -.035em;
}

h3 {
    font-size: 21px;
}

p {
    margin: 12px 0 0;
}

.hero-lead {
    max-width: 720px;
    font-size: 18px;
    color: #41514c;
}

.hero-actions,
.strip-inner {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 30px;
}

.btn {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 0 22px;
    font-weight: 700;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

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

.btn.primary {
    background: var(--deep);
    color: var(--cream);
    box-shadow: 0 12px 30px rgba(24, 55, 47, .22);
}

.btn.ghost {
    border: 1px solid rgba(24, 55, 47, .22);
    color: var(--deep);
    background: rgba(255, 250, 241, .5);
}

.domain-note {
    display: inline-flex;
    gap: 10px;
    align-items: center;
    margin-top: 28px;
    padding: 12px 16px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255, 250, 241, .7);
    color: var(--muted);
}

.domain-note strong {
    color: var(--deep);
    word-break: break-all;
}

.hero-art {
    padding: 16px;
    border-radius: 34px;
    background: rgba(255, 250, 241, .7);
    border: 1px solid rgba(24, 55, 47, .08);
    box-shadow: var(--shadow);
}

.section {
    padding: 84px 0;
}

.section.muted {
    background: #eef4e9;
}

.section.dark {
    background: var(--deep-2);
    color: rgba(255, 250, 241, .78);
}

.section.dark h2,
.section.dark h3 {
    color: var(--cream);
}

.section.dark .eyebrow {
    color: #b9d0c4;
}

.section-head {
    margin-bottom: 34px;
}

.section-head p {
    max-width: 820px;
    color: var(--muted);
}

.card-grid {
    display: grid;
    gap: 22px;
}

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

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

.card-grid.five {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.info-card,
.video-card,
.mini-card,
.course-card,
.topic-card,
.feature-list article,
.contact-panel,
.contact-form {
    background: rgba(255, 250, 241, .86);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 14px 38px rgba(24, 55, 47, .07);
}

.info-card {
    padding: 20px;
}

.info-card img {
    height: 120px;
    width: 100%;
    object-fit: contain;
    margin-bottom: 14px;
}

.tag {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 0 10px;
    border-radius: 999px;
    background: var(--sage);
    color: var(--deep);
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

.info-card p,
.video-card p,
.mini-card p,
.course-card p,
.topic-card p,
.feature-list p,
.contact-panel p {
    color: var(--muted);
}

.split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, .86fr);
    gap: 50px;
    align-items: center;
}

.split.reverse {
    grid-template-columns: minmax(320px, .86fr) minmax(0, 1fr);
}

.rounded-art {
    border-radius: 30px;
    background: rgba(255, 250, 241, .75);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.check-list {
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 12px;
}

.check-list li {
    position: relative;
    padding-left: 28px;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--moss);
    font-weight: 900;
}

.showcase {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.video-card {
    overflow: hidden;
}

.video-card img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: var(--sage);
}

.video-card.wide {
    display: grid;
    grid-template-columns: 42% 1fr;
    align-items: stretch;
}

.video-card.wide img {
    height: 100%;
    aspect-ratio: auto;
}

.video-body {
    padding: 22px;
}

.video-body small,
.course-card small {
    display: inline-block;
    margin-top: 14px;
    color: var(--moss);
    font-weight: 700;
}

.path-list {
    display: grid;
    gap: 16px;
}

.path-list article {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 16px;
    padding: 18px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: rgba(255, 250, 241, .72);
}

.path-list span {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: var(--deep);
    color: var(--cream);
    font-weight: 800;
}

.path-list.compact article {
    grid-template-columns: 44px 1fr;
}

.path-list.compact span {
    width: 38px;
    height: 38px;
    border-radius: 14px;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

.feature-list article,
.mini-card,
.course-card {
    padding: 24px;
}

.text-link {
    display: inline-flex;
    margin-top: 22px;
    color: var(--cream);
    font-weight: 800;
    border-bottom: 1px solid currentColor;
}

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

.faq-list details {
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255, 250, 241, .84);
    padding: 18px 20px;
}

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

.contact-strip {
    padding-top: 48px;
}

.strip-inner {
    justify-content: space-between;
    border-radius: 30px;
    background: linear-gradient(135deg, var(--deep), #355f50);
    color: rgba(255, 250, 241, .78);
    padding: 34px;
}

.strip-inner h2,
.strip-inner .eyebrow {
    color: var(--cream);
}

.page-hero {
    padding: 86px 0 64px;
    background:
        radial-gradient(circle at 16% 12%, rgba(66, 104, 90, .18), transparent 26%),
        linear-gradient(180deg, #fffaf1, #eef4e9);
    border-bottom: 1px solid var(--line);
}

.page-hero p:last-child {
    color: var(--muted);
    font-size: 18px;
}

.filter-bar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 26px;
}

.filter-btn {
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255, 250, 241, .86);
    color: var(--deep);
    padding: 10px 16px;
    cursor: pointer;
    font-weight: 700;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--deep);
    color: var(--cream);
}

.topic-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.topic-card {
    padding: 24px;
}

.topic-card img {
    width: 100%;
    height: 170px;
    object-fit: contain;
    margin-bottom: 16px;
}

.topic-card.large {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 38% 1fr;
    align-items: center;
    gap: 28px;
}

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

.timeline-item {
    padding: 24px;
    border-left: 4px solid var(--moss);
    background: rgba(255, 250, 241, .86);
    border-radius: 0 22px 22px 0;
    box-shadow: 0 12px 34px rgba(24, 55, 47, .07);
}

.timeline-item span {
    color: var(--moss);
    font-weight: 800;
}

.video-stage {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
    gap: 34px;
    align-items: center;
}

.player-shell {
    position: relative;
    border-radius: 30px;
    overflow: hidden;
    background: var(--deep);
    box-shadow: var(--shadow);
}

.play-button {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 76px;
    height: 76px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background: rgba(255, 250, 241, .82);
}

.play-button::after {
    content: "";
    position: absolute;
    left: 32px;
    top: 24px;
    border-left: 22px solid var(--deep);
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(300px, .85fr) minmax(0, 1.15fr);
    gap: 28px;
    align-items: start;
}

.contact-panel,
.contact-form {
    padding: 26px;
}

.contact-panel img {
    margin-top: 20px;
}

.contact-form {
    display: grid;
    gap: 16px;
}

.contact-form label {
    display: grid;
    gap: 8px;
    color: var(--deep);
    font-weight: 800;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fffdf7;
    padding: 12px 14px;
    font: inherit;
    color: var(--ink);
}

.form-result {
    min-height: 24px;
    color: var(--moss);
    font-weight: 700;
}

.site-footer {
    background: var(--deep-2);
    color: rgba(255, 250, 241, .72);
    padding: 54px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr .7fr .9fr;
    gap: 30px;
}

.footer-brand {
    font-size: 24px;
    color: var(--cream);
    font-weight: 900;
}

.site-footer h2 {
    font-size: 18px;
    color: var(--cream);
    margin-bottom: 12px;
}

.site-footer a {
    display: block;
    margin-top: 8px;
}

.footer-bottom {
    margin-top: 34px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 250, 241, .12);
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 14px;
}

@media (max-width: 980px) {
    .menu-toggle {
        display: block;
    }

    .main-nav {
        position: absolute;
        left: 20px;
        right: 20px;
        top: 74px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 14px;
        border-radius: 22px;
        background: var(--paper);
        box-shadow: var(--shadow);
        border: 1px solid var(--line);
    }

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

    .main-nav a {
        padding: 12px 14px;
    }

    .hero-grid,
    .split,
    .split.reverse,
    .video-stage,
    .contact-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .card-grid.three,
    .card-grid.four,
    .card-grid.five,
    .feature-list,
    .showcase,
    .topic-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .topic-card.large {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .container,
    .narrow {
        width: min(100% - 28px, 1180px);
    }

    .hero,
    .page-hero {
        padding: 58px 0 46px;
    }

    .section {
        padding: 58px 0;
    }

    .card-grid.three,
    .card-grid.four,
    .card-grid.five,
    .feature-list,
    .showcase,
    .topic-grid,
    .video-card.wide {
        grid-template-columns: 1fr;
    }

    .hero-actions,
    .strip-inner {
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .strip-inner {
        padding: 24px;
    }

    .path-list article {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        display: grid;
    }
}