/* ============================================================ base.css — 重置、字体系统、滚动、无障碍、降级 ============================================================ */ *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; } html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; } body { font-family: var(--font-sans); font-size: var(--fs-body); line-height: 1.75; color: var(--ink); background: var(--bg-night); min-height: 100vh; overflow-x: hidden; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; letter-spacing: 0.01em; } /* 选中态：暖橘微光 */ ::selection { background: rgba(255, 154, 77, 0.32); color: #fff; } /* 滚动条：细、克制、暗色（呼应洁癖） */ ::-webkit-scrollbar { width: 10px; } ::-webkit-scrollbar-track { background: var(--bg-deep); } ::-webkit-scrollbar-thumb { background: rgba(255, 184, 112, 0.16); border-radius: var(--radius-full); border: 2px solid var(--bg-deep); } ::-webkit-scrollbar-thumb:hover { background: rgba(255, 184, 112, 0.32); } h1, h2, h3, h4 { font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; } p { color: var(--ink-soft); } a { color: var(--lamp-bright); text-decoration: none; } button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; } ul, ol { list-style: none; } img, svg { display: block; max-width: 100%; } /* ---------- 无障碍：键盘聚焦环 ---------- */ :focus-visible { outline: 2px solid var(--lamp); outline-offset: 3px; border-radius: var(--radius-xs); } /* ---------- 屏幕阅读器专用 ---------- */ .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; } /* ---------- 通用工具 ---------- */ .is-hidden { display: none !important; } .visually-muted { color: var(--ink-faint); } /* ---------- 减少动效偏好：温柔降级 ---------- */ @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; } } /* 手动"安静模式"：由 JS 在 上加 .calm，全局收敛动效 */ html.calm *, html.calm *::before, html.calm *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.15s !important; } html.calm .ambience__particles, html.calm .ambience__pulse { display: none !important; }