:root {
    --blue: #5aa8ff;
    --blue-deep: #2b78d4;
    --sky: #eaf6ff;
    --cream: #fff4cf;
    --orange: #ffb06a;
    --orange-deep: #f08a3c;
    --white: #ffffff;
    --ink: #26384f;
    --muted: #63748a;
    --line: #e5eef9;
    --shadow: 0 18px 40px rgba(72, 114, 159, .14);
    --radius: 28px;
    --radius-sm: 18px;
    --max: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at top left, rgba(255, 244, 207, .95), transparent 32rem),
        radial-gradient(circle at 90% 10%, rgba(90, 168, 255, .16), transparent 24rem),
        #f9fcff;
    line-height: 1.7;
}

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

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

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

.container {
    width: min(100% - 32px, var(--max));
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    top: -48px;
    left: 16px;
    z-index: 100;
    background: var(--blue-deep);
    color: var(--white);
    padding: 10px 14px;
    border-radius: 12px;
}

.skip-link:focus {
    top: 16px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .86);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229, 238, 249, .85);
}

.nav-wrap {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
}

.brand-mark {
    width: 48px;
    height: 48px;
    display: inline-grid;
    place-items: center;
    border-radius: 18px;
    color: var(--white);
    background: linear-gradient(135deg, var(--blue), var(--orange));
    box-shadow: 0 10px 22px rgba(90, 168, 255, .28);
    letter-spacing: .2px;
}

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

.primary-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.primary-nav a {
    padding: 10px 14px;
    border-radius: 999px;
    color: var(--muted);
    font-weight: 700;
}

.primary-nav a:hover,
.primary-nav a.active {
    color: var(--blue-deep);
    background: var(--sky);
}

.nav-toggle {
    display: none;
    border: 0;
    background: var(--sky);
    color: var(--blue-deep);
    border-radius: 999px;
    padding: 10px 14px;
    font-weight: 800;
}

.hero {
    padding: 72px 0 44px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.04fr .96fr;
    align-items: center;
    gap: 46px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 16px;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(255, 244, 207, .9);
    color: var(--orange-deep);
    font-weight: 800;
}

h1, h2, h3 {
    line-height: 1.18;
    margin: 0;
    color: #1e314b;
}

h1 {
    font-size: clamp(2.15rem, 5vw, 4.8rem);
    letter-spacing: -1.6px;
}

h2 {
    font-size: clamp(1.7rem, 3.4vw, 2.8rem);
    letter-spacing: -.8px;
}

h3 {
    font-size: 1.22rem;
}

.lead {
    font-size: 1.12rem;
    color: var(--muted);
    margin: 22px 0 0;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    padding: 12px 20px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 800;
    cursor: pointer;
}

.btn.primary {
    background: linear-gradient(135deg, var(--blue-deep), var(--blue));
    color: var(--white);
    box-shadow: 0 12px 24px rgba(43, 120, 212, .22);
}

.btn.soft {
    color: var(--blue-deep);
    background: var(--white);
    border-color: var(--line);
}

.hero-card,
.panel,
.card,
.feature-card,
.feedback-card,
.notice-card,
.form-card {
    background: rgba(255, 255, 255, .92);
    border: 1px solid rgba(229, 238, 249, .9);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.hero-card {
    position: relative;
    padding: 20px;
    overflow: hidden;
}

.hero-card::before {
    content: "";
    position: absolute;
    inset: -30% -20% auto auto;
    width: 230px;
    height: 230px;
    background: rgba(255, 176, 106, .28);
    border-radius: 50%;
}

.hero-card img {
    position: relative;
    border-radius: 24px;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-top: 18px;
}

.stat {
    background: var(--sky);
    border-radius: 20px;
    padding: 14px;
}

.stat strong {
    display: block;
    color: var(--blue-deep);
    font-size: 1.4rem;
}

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

.section {
    padding: 56px 0;
}

.section-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 26px;
}

.section-head p {
    max-width: 680px;
    margin: 12px 0 0;
    color: var(--muted);
}

.grid {
    display: grid;
    gap: 20px;
}

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

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

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

.card,
.feature-card,
.feedback-card,
.notice-card {
    padding: 24px;
}

.card img,
.feature-card img,
.notice-card img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    border-radius: 20px;
    margin-bottom: 18px;
    background: var(--sky);
}

.card p,
.feature-card p,
.feedback-card p,
.notice-card p {
    color: var(--muted);
    margin: 10px 0 0;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 14px 0 0;
}

.tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    background: #f2f8ff;
    color: var(--blue-deep);
    font-size: .88rem;
    font-weight: 800;
    padding: 6px 10px;
}

.tag.orange {
    background: #fff3e8;
    color: #b75a14;
}

.panel {
    padding: 30px;
}

.panel.split {
    display: grid;
    grid-template-columns: .95fr 1.05fr;
    gap: 28px;
    align-items: center;
}

.check-list {
    list-style: none;
    padding: 0;
    margin: 20px 0 0;
    display: grid;
    gap: 12px;
}

.check-list li {
    display: flex;
    gap: 10px;
    color: var(--muted);
}

.check-list li::before {
    content: "✓";
    flex: 0 0 26px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: inline-grid;
    place-items: center;
    background: var(--cream);
    color: var(--orange-deep);
    font-weight: 900;
}

.age-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 12px;
}

.age-table th {
    text-align: left;
    color: var(--muted);
    font-size: .94rem;
    padding: 0 16px;
}

.age-table td {
    background: var(--white);
    padding: 16px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.age-table td:first-child {
    border-left: 1px solid var(--line);
    border-radius: 18px 0 0 18px;
    font-weight: 900;
    color: var(--blue-deep);
}

.age-table td:last-child {
    border-right: 1px solid var(--line);
    border-radius: 0 18px 18px 0;
    color: var(--muted);
}

.timeline {
    display: grid;
    gap: 18px;
    counter-reset: step;
}

.timeline-item {
    position: relative;
    padding: 22px 22px 22px 70px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 24px;
}

.timeline-item::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 22px;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--blue);
    color: var(--white);
    font-weight: 900;
}

.video-card {
    overflow: hidden;
    padding: 0;
}

.video-thumb {
    position: relative;
    min-height: 210px;
    background: var(--sky);
}

.video-thumb img {
    border-radius: 0;
    margin: 0;
    height: 100%;
    width: 100%;
    object-fit: cover;
}

.play-dot {
    position: absolute;
    left: 18px;
    bottom: 18px;
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, .92);
    color: var(--blue-deep);
    font-weight: 900;
    box-shadow: 0 10px 22px rgba(38, 56, 79, .15);
}

.video-card .content {
    padding: 22px;
}

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

.faq details {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 18px 20px;
}

.faq summary {
    cursor: pointer;
    font-weight: 900;
}

.faq p {
    color: var(--muted);
    margin: 10px 0 0;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.form-card input,
.form-card textarea,
.form-card select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 13px 14px;
    background: #fbfdff;
    outline: none;
}

.form-card textarea {
    min-height: 138px;
    resize: vertical;
}

.full {
    grid-column: 1 / -1;
}

.form-note {
    color: var(--muted);
    font-size: .94rem;
}

.alert {
    display: none;
    margin-top: 14px;
    padding: 12px 14px;
    background: var(--sky);
    color: var(--blue-deep);
    border-radius: 16px;
    font-weight: 800;
}

.alert.show {
    display: block;
}

.site-footer {
    margin-top: 44px;
    padding: 46px 0;
    background: #213047;
    color: #e8f2ff;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr .7fr .85fr;
    gap: 28px;
}

.footer-brand .brand-text {
    color: var(--white);
}

.site-footer p,
.site-footer a {
    color: #bfd1e8;
}

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

.site-footer h2 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 10px;
}

@media (max-width: 980px) {
    .hero-grid,
    .panel.split,
    .grid.three,
    .grid.four,
    .grid.two,
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .hero-grid,
    .panel.split {
        grid-template-columns: 1fr;
    }

    .primary-nav {
        position: absolute;
        top: 76px;
        left: 16px;
        right: 16px;
        display: none;
        flex-direction: column;
        align-items: stretch;
        padding: 12px;
        border-radius: 24px;
        background: var(--white);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
    }

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

    .nav-toggle {
        display: inline-flex;
    }
}

@media (max-width: 680px) {
    .container {
        width: min(100% - 24px, var(--max));
    }

    .hero {
        padding-top: 44px;
    }

    .grid.three,
    .grid.four,
    .grid.two,
    .footer-grid,
    .stats-row,
    .form-grid {
        grid-template-columns: 1fr;
    }

    .section-head {
        display: block;
    }

    .panel,
    .card,
    .feature-card,
    .feedback-card,
    .notice-card,
    .form-card {
        padding: 20px;
        border-radius: 22px;
    }

    .age-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}