/* =============================================================
   Base · 重置 / 基础排版 / 全局原子工具
   ============================================================= */

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

* { margin: 0; }

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

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--text);
  background:
    radial-gradient(1100px 620px at 8% -8%, rgba(51,112,255,0.06), transparent 60%),
    radial-gradient(1000px 600px at 102% 4%, rgba(122,90,248,0.045), transparent 55%),
    var(--bg-app);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "tnum" on, "cv05" on;
  min-height: 100vh;
}

h1, h2, h3, h4, h5 { font-weight: var(--fw-semibold); color: var(--text-strong); letter-spacing: -0.01em; }
h1 { letter-spacing: -0.02em; }

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

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
button:disabled { cursor: not-allowed; }

ul, ol { list-style: none; padding: 0; }

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

svg { display: block; flex-shrink: 0; }

:focus-visible { outline: 2px solid var(--brand-500); outline-offset: 2px; }

/* ---- 滚动条 ---- */
* { scrollbar-width: thin; scrollbar-color: var(--gray-200) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--gray-200);
  border-radius: var(--r-full);
  border: 3px solid transparent;
  background-clip: padding-box;
}
*::-webkit-scrollbar-thumb:hover { background: var(--gray-300); background-clip: padding-box; }

/* ---- 文本工具 ---- */
.t-display { font-size: var(--fs-display); line-height: var(--lh-display); font-weight: var(--fw-bold); letter-spacing: -0.02em; }
.t-h1 { font-size: var(--fs-h1); line-height: var(--lh-h1); font-weight: var(--fw-bold); letter-spacing: -0.01em; }
.t-h2 { font-size: var(--fs-h2); line-height: var(--lh-h2); font-weight: var(--fw-semibold); }
.t-h3 { font-size: var(--fs-h3); line-height: var(--lh-h3); font-weight: var(--fw-semibold); }
.t-sm { font-size: var(--fs-sm); line-height: var(--lh-sm); }
.t-xs { font-size: var(--fs-xs); line-height: var(--lh-xs); }
.t-muted { color: var(--text-muted); }
.t-faint { color: var(--text-faint); }
.t-strong { color: var(--text-strong); }
.t-medium { font-weight: var(--fw-medium); }
.t-semibold { font-weight: var(--fw-semibold); }
.t-mono { font-family: var(--font-mono); font-feature-settings: "tnum" on; }
.t-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.t-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---- flex / grid 原子 ---- */
.row { display: flex; align-items: center; }
.row-top { display: flex; align-items: flex-start; }
.col { display: flex; flex-direction: column; }
.between { justify-content: space-between; }
.center { justify-content: center; align-items: center; }
.wrap { flex-wrap: wrap; }
.grow { flex: 1; min-width: 0; }
.gap-1 { gap: var(--sp-1); } .gap-2 { gap: var(--sp-2); } .gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); } .gap-5 { gap: var(--sp-5); } .gap-6 { gap: var(--sp-6); }

.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---- 进入动画 ---- */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop-in {
  from { opacity: 0; transform: translateY(10px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes shimmer {
  0% { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

/* 页面切换入场：仅淡入，不做位移，避免整页抖动 */
[data-animate] { animation: fade-in var(--t-base) var(--ease-out) both; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* Material Symbols 本地字体 */
@font-face {
  font-family: "Material Symbols Outlined";
  font-style: normal;
  font-weight: 100 700;
  font-display: block;
  src: url("../vendor/material-symbols-outlined.ttf") format("truetype");
}
.msym {
  font-family: "Material Symbols Outlined";
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  line-height: 1;
  letter-spacing: normal;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "liga";
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  user-select: none;
}
.msym.fill { font-variation-settings: "FILL" 1, "wght" 400, "GRAD" 0, "opsz" 24; }