:root {
    --os-white: #ffffff;
    --os-soft: #f7f2eb;
    --os-soft-2: #fbf8f4;
    --os-sand: #dfd0bb;
    --os-sky: #80c8e8;
    --os-blue: #2eaee6;
    --os-blue-dark: #42d9ff;
    --os-text: #17242b;
    --os-muted: #667277;
    --os-border: #e7dfd5;
    --os-shadow: 0 18px 45px rgba(29, 37, 40, 0.09);
    --os-font-primary: "Deng Xian", "DengXian", "Microsoft YaHei", Arial, sans-serif;
    --os-font-light: "Deng Xian Light", "DengXian Light", "Deng Xian", "DengXian", "Microsoft YaHei", Arial, sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    width: 100%;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

body {
    width: 100%;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    color: var(--os-text);
    background: var(--os-white);
    font-family: var(--os-font-light);
    font-size: 16px;
    font-weight: 300;
    line-height: 1.65;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

body.os-nav-open {
    overflow: hidden;
}

main,
header,
footer,
nav,
section,
figure {
    display: block;
}

main,
figure {
    margin: 0;
}

.os-site-main {
    margin: 0;
    padding: 0;
}

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

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

h1,
h2 {
    margin: 0 0 20px;
    color: var(--os-text);
    font-family: var(--os-font-primary);
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.015em;
}

h3,
h4,
h5,
h6 {
    margin: 0 0 16px;
    color: var(--os-text);
    font-family: var(--os-font-light);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: 0;
}

h1 {
    max-width: 920px;
    font-size: clamp(46px, 5vw, 78px);
}

h2 {
    font-size: clamp(34px, 3.2vw, 52px);
}

h3 {
    font-size: 24px;
}

h4 {
    font-size: 20px;
}

p {
    margin: 0 0 18px;
    color: var(--os-muted);
    font-family: var(--os-font-light);
    font-weight: 300;
}

a {
    color: inherit;
}

strong,
b {
    font-family: var(--os-font-primary);
    font-weight: 600;
}

.os-container {
    width: min(1336px, calc(100% - 64px));
    margin-inline: auto;
}

.os-section {
    padding: 96px 0;
}

.os-soft {
    background: var(--os-soft);
}

.os-kicker {
    margin: 0 0 18px;
    color: var(--os-blue);
    font-family: var(--os-font-primary);
    font-size: 13px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.os-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
}

.os-button {
    min-height: 54px;
    padding: 15px 27px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--os-blue);
    border-radius: 0;
    background: var(--os-blue);
    color: var(--os-white);
    box-shadow: none;
    font-family: var(--os-font-primary);
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.os-button:hover,
.os-button:focus-visible {
    background: var(--os-blue-dark);
    border-color: var(--os-blue-dark);
    color: var(--os-white);
}

.os-button--light {
    background: rgba(255, 255, 255, 0.8);
    color: var(--os-text);
    border-color: var(--os-text);
}

.os-button--light:hover,
.os-button--light:focus-visible {
    background: var(--os-text);
    border-color: var(--os-text);
    color: var(--os-white);
}

.os-link {
    color: var(--os-blue);
    font-family: var(--os-font-primary);
    font-weight: 600;
    text-decoration-thickness: 1px;
}

.os-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

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

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

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

.os-card {
    padding: 30px;
    background: var(--os-white);
    border: 1px solid var(--os-border);
    box-shadow: var(--os-shadow);
}

.os-card p {
    margin-bottom: 0;
}

.os-section-heading {
    max-width: 720px;
    margin-bottom: 34px;
}

.os-narrow {
    max-width: 760px;
}

.os-centered-action {
    margin-top: 34px;
    text-align: center;
}

.os-image-placeholder {
    min-height: 300px;
    padding: 24px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #f8f5ef, #e7f5fb);
    border: 1px solid var(--os-border);
    color: var(--os-blue);
    text-align: center;
    font-family: var(--os-font-primary);
    font-weight: 600;
}

.os-photo-card {
    min-height: 520px;
    padding: 24px;
    display: grid;
    align-items: end;
    background-color: #e7f5fb;
    background-size: cover;
    background-position: center;
    border: 1px solid var(--os-border);
    box-shadow: var(--os-shadow);
    color: var(--os-white);
    font-family: var(--os-font-primary);
    font-weight: 600;
}

.os-cta {
    background: linear-gradient(135deg, #f5efe6, #e7f5fb);
}

.os-cta__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 28px;
}

.os-page-hero {
    padding-top: 150px;
    background: var(--os-soft);
}

.os-page-hero__inner {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}

.os-page-hero__inner > .os-kicker + h1,
.os-page-hero__inner > h1 {
    max-width: 820px;
}

.os-form-wrap {
    max-width: 840px;
}

.os-form {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    padding: 30px;
    background: var(--os-white);
    border: 1px solid var(--os-border);
    box-shadow: var(--os-shadow);
}

.os-form label {
    display: grid;
    gap: 8px;
    color: var(--os-text);
    font-family: var(--os-font-primary);
    font-weight: 600;
}

.os-form input,
.os-form textarea {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--os-border);
    background: #ffffff;
    color: var(--os-text);
    font: inherit;
}

.os-form__full,
.os-form-note {
    grid-column: 1 / -1;
}

.os-form-note {
    margin: 0;
    font-size: 14px;
}

.os-step {
    color: var(--os-blue);
    font-family: var(--os-font-primary);
    font-weight: 600;
}

.os-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}