/* ==========================================================================
   简方 JianFang · 基础重置与排版
   ========================================================================== */

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.75;
    letter-spacing: .5px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition), color var(--transition);
}

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

a {
    color: var(--link);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent);
}

button {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    cursor: pointer;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: .5px;
    margin: 0;
}

p {
    margin: 0;
}

ul,
ol {
    margin: 0;
    padding: 0;
}

[hidden] {
    display: none !important;
}

::selection {
    background: var(--accent-soft);
    color: var(--text);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 3px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
}

/* ---- 无障碍工具类 ---- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 120;
    padding: 10px 16px;
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
    left: 0;
    color: var(--accent);
}

/* ---- 通用按钮 ---- */
.hero__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 20px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 14.5px;
    line-height: 1.6;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.hero__btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.hero__btn--primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
}

.hero__btn--primary:hover {
    background: var(--accent);
    color: var(--bg);
    opacity: .88;
}