@font-face {
    font-family: "RuiNexus Display";
    src: url("../fonts/DingTalk-JinBuTi.ttf") format("truetype");
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "RuiNexus Sans";
    src: url("../fonts/DingTalk-Sans.ttf") format("truetype");
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

:root {
    --color-ink: #0b0b0c;
    --color-strong: #171717;
    --color-text: #2c2c2f;
    --color-muted: #6b6b72;
    --color-line: #e7e7e9;
    --color-soft: #f5f5f6;
    --color-paper: #ffffff;
    --color-paper-soft: #fafafa;
    --radius-xl: 32px;
    --radius-lg: 24px;
    --radius-md: 16px;
    --shadow-soft: 0 24px 80px rgba(0, 0, 0, 0.08);
    --container: min(1120px, calc(100vw - 40px));
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at 10% 0%, rgba(0, 0, 0, 0.055), transparent 30%),
        linear-gradient(180deg, #ffffff 0%, #f7f7f8 55%, #ffffff 100%);
    color: var(--color-text);
    font-family: "RuiNexus Sans", "Microsoft YaHei", "PingFang SC", sans-serif;
    line-height: 1.65;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(0, 0, 0, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 0, 0, 0.035) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.42), transparent 72%);
    z-index: -1;
}

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

button,
a {
    -webkit-tap-highlight-color: transparent;
}

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

.container {
    width: var(--container);
    margin: 0 auto;
}

.section {
    padding: 100px 0;
}

.section-kicker {
    margin: 0 0 16px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

.section-title {
    margin: 0;
    color: var(--color-ink);
    font-family: "RuiNexus Display", "RuiNexus Sans", sans-serif;
    font-size: clamp(32px, 4.8vw, 64px);
    font-weight: 400;
    line-height: 1.08;
    letter-spacing: -0.04em;
    text-wrap: pretty;
}

.section-lead {
    max-width: 720px;
    margin: 24px 0 0;
    color: var(--color-muted);
    font-size: clamp(17px, 2vw, 20px);
    text-wrap: pretty;
}

.btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-radius: 999px;
    padding: 0 22px;
    border: 1px solid var(--color-ink);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 220ms ease, color 220ms ease, border-color 220ms ease;
}

.btn:hover,
.btn:focus-visible {
    /* no Y shift — hover stays grounded */
}

.btn-primary {
    background: var(--color-ink);
    color: var(--color-paper);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: #2a2a2d;
    border-color: #2a2a2d;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.62);
    color: var(--color-ink);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
    background: var(--color-paper);
}

:focus-visible {
    outline: 2px solid var(--color-ink);
    outline-offset: 4px;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(22px);
}

@media (max-width: 760px) {
    :root {
        --container: min(100vw - 28px, 1120px);
    }

    .section {
        padding: 72px 0;
    }

    .btn {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}