/* 问学 · 品牌设计规范 v3.0（2.0：参照阿里云百炼控制台——浅灰留白、近黑文字、黑色胶囊主按钮、青—蓝—紫流光点缀；1.4.2 标志与动效沿用）
 *
 * 标志：问学 Q 形标志（宝蓝 #0B2A86 主体 + 琥珀黄 #FFB21F 旋臂），见 site/logo*.svg。
 * 色彩：宝蓝为主色，电光蓝 #2F6BFF 为科技点缀，琥珀黄只用于强调与高光；浅灰蓝底 + 白色大圆角卡片。
 * 动效：粒子星网（site/fx.js）、流光渐变主卡片、视频背景、鼠标聚光与滚动渐显；系统“减少动态效果”开启时全部关闭。
 * 节奏：4px 基础网格，20px 页面边距，主要按钮 52px 高、全圆角；卡片圆角 24px。
 * 本文件由首页、学生端、导师端、管理后台共同引用，修改一处即全局生效。
 */
:root {
  /* 色彩 */
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  --wx-ink-2: #173BAA;        /* 悬停 */
  --wx-ink-deep: #061A5C;
  --wx-steel: #2F6BFF;        /* 电光蓝：点缀、进度、焦点 */
  --wx-steel-2: #3B5390;      /* 辅助文字（满足对比度） */
  --wx-steel-3: #C3D2F7;      /* 深蓝底上的辅助文字 */
  --wx-sun: #FFB21F;          /* 琥珀黄：标志旋臂、高光、重点数字 */
  --wx-sun-bg: #FFF4DC;
  --wx-tint: #E8EEFF;         /* 浅蓝：次要按钮、图标底、选中背景 */
  --wx-tint-2: #F2F5FF;
  --wx-cyan: #2F6BFF;         /* 兼容旧名：焦点、链接 */
  --wx-seal: #B4403A;         /* 风险、拦截 */
  --wx-seal-bg: #FBEEED;
  --wx-bamboo: #24785A;       /* 通过、已核验、已存证 */
  --wx-bamboo-bg: #E6F4EE;
  --wx-amber: #A06A0E;        /* 提醒、待处理 */
  --wx-amber-bg: #FFF4DC;
  --wx-paper: #F7F7F9;        /* 页面底色 */
  --wx-surface: #FFFFFF;
  --wx-text: #14151C;         /* 正文 */
  --wx-muted: #5E606B;        /* 次要文字 */
  --wx-line: #E8E8EC;
  --wx-grid: #E1E6F0; --wx-grid-strong: #C3D2F7;   /* 兼容旧名 */
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  /* 字体：系统字体，不引用在线字体 */
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  --wx-serif: var(--wx-sans);   /* 2.0 起标题统一用无衬线粗体 */
  /* 形状与层次 */
  --wx-radius: 24px;          /* 卡片 */
  --wx-radius-md: 18px;       /* 列表项、输入框 */
  --wx-radius-sm: 12px;
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  /* 标志 */
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-16 6 -52 14 -80 18 -27 4 -63 12 -78 18 -16 7 -45 12 -65 12 -20 1 -48 7 -62 15 -14 8 -44 14 -68 15 -23 0 -68 6 -100 14 -79 20 -178 34 -512 71 -283 32 -905 46 -1085 24z%22/%3E%3C/svg%3E");
  /* 2.0：百炼风格配色 */
  --wx2-black: #06111A; --wx2-blue: #3E6BFF; --wx2-violet: #7C6CF2; --wx2-teal: #3CC6B4; --wx2-panel: rgb(219, 231, 255);
  --wx2-flow: conic-gradient(from 0deg, rgba(93,216,200,.75), rgba(123,170,247,.75), rgba(167,139,250,.8), rgba(93,216,200,.75));
  /* 兼容 1.3：蓝图稿纸母题已停用，保留变量避免旧样式报错 */
  --wx-bp-img: none;
  --wx-bp-size: auto;
}

/* 标志：旋臂 Q + “问学” */
.wx-logo { display: inline-block; width: 1em; height: 1em; background: var(--wx-logo) center / contain no-repeat; vertical-align: middle; flex-shrink: 0; }
.wx-logo.on-ink { background-image: var(--wx-logo-white); }
.wx-mark { display: inline-flex; align-items: center; gap: .32em; font-weight: 800; letter-spacing: .04em; line-height: 1; color: var(--wx-ink); vertical-align: middle; }
.wx-mark::before { content: ""; width: 1.55em; height: 1.55em; background: var(--wx-logo) center / contain no-repeat; flex-shrink: 0; }
.wx-mark span { font-family: var(--wx-sans); }
.wx-mark.on-ink { color: #fff; }
.wx-mark.on-ink::before { background-image: var(--wx-logo-white); }

/* 深蓝主卡片（原“蓝图稿纸”类名保留兼容）：流光渐变 + 细网格 + 扫光 */
.wx-blueprint, .wx-hero-card { position: relative; isolation: isolate; overflow: hidden; color: #fff; background-color: #0B0D16;
  background-image: radial-gradient(60% 80% at 100% 0%, rgba(124, 108, 242, .55) 0%, rgba(124, 108, 242, 0) 60%),
    radial-gradient(50% 60% at 0% 100%, rgba(60, 198, 180, .30) 0%, rgba(60, 198, 180, 0) 60%), linear-gradient(135deg, #0B0D16 0%, #141A33 55%, #232B5C 100%);
  background-size: 160% 160%, 160% 160%, 100% 100%; animation: wxAurora 14s ease-in-out infinite alternate; }
.wx-blueprint::before, .wx-hero-card::before { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 28px 28px; -webkit-mask-image: radial-gradient(90% 80% at 80% 10%, #000 0%, transparent 75%); mask-image: radial-gradient(90% 80% at 80% 10%, #000 0%, transparent 75%); }
.wx-blueprint::after, .wx-hero-card::after { content: ""; position: absolute; top: -50%; left: -60%; width: 40%; height: 200%; z-index: -1; pointer-events: none;
  background: linear-gradient(100deg, transparent 0%, rgba(255,255,255,.10) 50%, transparent 100%); transform: rotate(12deg); animation: wxSweep 7s ease-in-out infinite; }
@keyframes wxAurora { 0% { background-position: 100% 0%, 0% 100%, 0 0; } 100% { background-position: 60% 40%, 40% 60%, 0 0; } }
@keyframes wxSweep { 0%, 55% { left: -60%; } 100% { left: 140%; } }
.wx-hero-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; opacity: .55; mix-blend-mode: screen; pointer-events: none; }

/* 标题 */
.wx-serif, h1.wx, h2.wx { font-family: var(--wx-sans); font-weight: 700; letter-spacing: .01em; }
.wx-crumb { font-size: 12px; font-weight: 500; color: var(--wx-steel-2); letter-spacing: .02em; }

/* 按钮 */
.wx-btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 52px; padding: 0 28px; border-radius: var(--wx-pill);
  font: 600 16px/1 var(--wx-sans); text-decoration: none; border: 0; cursor: pointer; transition: background .15s, transform .1s; }
.wx-btn:active { transform: scale(.98); }
.wx-btn.primary { position: relative; overflow: hidden; background: var(--wx-ink); color: #fff; box-shadow: 0 8px 20px -10px rgba(11, 42, 134, .7); }
.wx-btn.primary:hover { background: var(--wx-ink-2); box-shadow: var(--wx-glow); }
.wx-btn.primary::after { content: ""; position: absolute; top: 0; left: -80%; width: 50%; height: 100%; background: linear-gradient(100deg, transparent, rgba(255,255,255,.28), transparent); transform: skewX(-18deg); transition: left .6s ease; }
.wx-btn.primary:hover::after { left: 130%; }
.wx-btn.soft { background: var(--wx-tint); color: var(--wx-ink); }
.wx-btn.soft:hover { background: #DCE5FF; }
.wx-btn.white { background: #fff; color: var(--wx-ink); }
.wx-btn.sm { height: 40px; padding: 0 18px; font-size: 14px; }

/* 图标圆底 */
.wx-ico { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; background: var(--wx-tint); color: var(--wx-ink); flex-shrink: 0; }
.wx-ico svg { width: 22px; height: 22px; }

/* 焦点 */
:focus-visible { outline: 2px solid var(--wx-steel); outline-offset: 2px; }

/* 数字等宽对齐 */
.wx-num { font-variant-numeric: tabular-nums; }

/* 渐变标题字、鼠标聚光卡片、状态点 */
.wx-grad-text { background: var(--wx-grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.wx-spot { position: relative; --mx: 50%; --my: 50%; }
.wx-spot::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0; transition: opacity .25s;
  background: radial-gradient(260px circle at var(--mx) var(--my), rgba(47, 107, 255, .10), transparent 60%); }
.wx-spot:hover::after { opacity: 1; }
.wx-pulse { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--wx-sun); box-shadow: 0 0 0 0 rgba(255,178,31,.6); animation: wxPulse 2s infinite; }
@keyframes wxPulse { 0% { box-shadow: 0 0 0 0 rgba(255,178,31,.55); } 70% { box-shadow: 0 0 0 10px rgba(255,178,31,0); } 100% { box-shadow: 0 0 0 0 rgba(255,178,31,0); } }
.wx-fx-canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }
.wx-shimmer { background: linear-gradient(90deg, var(--wx-tint-2) 0%, #fff 50%, var(--wx-tint-2) 100%); background-size: 200% 100%; animation: wxShimmer 1.4s linear infinite; }
@keyframes wxShimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }

.wx-reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s cubic-bezier(.2,.7,.2,1); }
.wx-reveal.wx-in { opacity: 1; transform: none; }
.wx-ripple { position: absolute; border-radius: 50%; background: rgba(255,255,255,.35); transform: scale(0); animation: wxRipple .6s ease-out forwards; pointer-events: none; }
@keyframes wxRipple { to { transform: scale(1); opacity: 0; } }

/* AI生成标识（显示为“问学AI”） */
.wx-ai-label { font-size: 11px; line-height: 1.6; color: var(--wx-steel-2); background: var(--wx-tint-2); border-radius: 8px; padding: 4px 8px; margin-top: 8px; }

@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }