/* ============================================================
   AI 口语陪练小老师 · 蒸汽波 Vaporwave 主题
   配色为规范指定色值（CSS 变量），勿改动
   ============================================================ */
:root{
  --c-primary:#d65ca8;
  --c-accent:#4ec667;
  --c-cta:#61e5bf;
  --c-bg:#150e13;
  --c-surface:#231a20;
  --c-surface-2:#2c2229;
  --c-text:#f2eef0;
  --c-dim:#ae98a6;
  --c-border:#40303a;
  --c-purple:#8a4bd1;
  --r:6px;
  --font-head:'Poppins','Noto Sans SC',system-ui,sans-serif;
  --font-body:'JetBrains Mono','Fira Code',ui-monospace,'SFMono-Regular','Courier New',monospace;
  --topbar:64px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.65;
  min-height:100vh;
  overflow-x:hidden;
}
::selection{background:var(--c-primary);color:#fff}
button{font-family:inherit;cursor:pointer}
input,select{font-family:inherit}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--c-border);border-radius:6px}
::-webkit-scrollbar-track{background:transparent}

/* ============ 背景舞台 ============ */
.stage{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;
  background:
    radial-gradient(120% 90% at 50% -10%, rgba(138,75,209,.28), transparent 55%),
    radial-gradient(90% 70% at 85% 110%, rgba(214,92,168,.16), transparent 60%),
    var(--c-bg);
}
/* 渐变太阳（蒸汽波条纹） */
.bg-sun{
  position:absolute;right:6vw;top:10vh;width:240px;height:240px;border-radius:50%;
  background:repeating-linear-gradient(to bottom,#f6e7f1 0 10px,#d65ca8 10px 22px,#7a3fd6 22px 34px);
  -webkit-mask-image:linear-gradient(to bottom,#000 40%,transparent 98%);
  mask-image:linear-gradient(to bottom,#000 40%,transparent 98%);
  opacity:.42;
  filter:drop-shadow(0 0 46px rgba(214,92,168,.5));
  animation:sunFloat 14s ease-in-out infinite;
}
/* 网格地平线 */
.bg-grid{
  position:absolute;left:-20%;right:-20%;bottom:-6%;height:52vh;
  background:
    repeating-linear-gradient(90deg, rgba(214,92,168,.20) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg,   rgba(97,229,191,.16) 0 1px, transparent 1px 30px);
  transform:perspective(380px) rotateX(62deg);
  transform-origin:50% 0;
  -webkit-mask-image:linear-gradient(to top,rgba(0,0,0,.95),transparent 90%);
  mask-image:linear-gradient(to top,rgba(0,0,0,.95),transparent 90%);
  animation:gridScroll 16s linear infinite;
}
/* 漂浮光斑 */
.orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.34}
.orb-a{width:280px;height:280px;background:#d65ca8;top:-70px;left:-70px;animation:floatA 18s ease-in-out infinite}
.orb-b{width:240px;height:240px;background:#61e5bf;bottom:6vh;right:-80px;opacity:.16;animation:floatB 22s ease-in-out infinite}
.orb-c{width:200px;height:200px;background:#4ec667;left:22%;bottom:-60px;opacity:.14;animation:floatA 26s ease-in-out infinite reverse}
/* 复古 CRT 扫描线 */
.bg-scan{
  position:absolute;inset:0;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,.14) 0 1px,transparent 1px 3px);
  opacity:.45;mix-blend-mode:overlay;
}
.bg-vignette{position:absolute;inset:0;
  background:radial-gradient(120% 120% at 50% 40%,transparent 55%,rgba(6,3,8,.6) 100%)}

/* ============ 顶栏 ============ */
.topbar{
  position:fixed;top:0;left:0;right:0;height:var(--topbar);z-index:40;
  display:flex;align-items:center;gap:18px;padding:0 22px;
  background:rgba(21,14,19,.72);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--c-border);
}
.brand{display:flex;align-items:center;gap:10px;cursor:pointer;user-select:none}
.brand-logo{font-size:22px;filter:drop-shadow(0 0 8px rgba(214,92,168,.6))}
.brand-name{font-family:var(--font-head);font-weight:800;font-size:17px;letter-spacing:.5px}
.brand-accent{color:var(--c-primary);text-shadow:0 0 12px rgba(214,92,168,.7)}
.nav{display:flex;gap:6px;margin-left:auto}
.nav-btn{
  border:1px solid transparent;background:transparent;color:var(--c-dim);
  font-size:14px;padding:9px 14px;border-radius:var(--r);transition:.2s;
}
.nav-btn:hover{color:var(--c-text);border-color:var(--c-border)}
.nav-btn.active{
  color:var(--c-text);
  background:linear-gradient(90deg,rgba(214,92,168,.18),rgba(138,75,209,.14));
  border-color:var(--c-primary);
  box-shadow:inset 0 0 14px rgba(214,92,168,.18);
  text-shadow:0 0 10px rgba(214,92,168,.8);
}
.top-actions{display:flex;align-items:center;gap:10px}
.streak-pill{
  font-size:13px;color:var(--c-cta);border:1px solid var(--c-border);
  padding:5px 11px;border-radius:var(--r);background:var(--c-surface);
  text-shadow:0 0 8px rgba(97,229,191,.5);
}
.streak-pill b{font-size:14px}
.icon-btn{
  width:38px;height:38px;border-radius:var(--r);border:1px solid var(--c-border);
  background:var(--c-surface);color:var(--c-text);font-size:16px;transition:.2s;
}
.icon-btn:hover{border-color:var(--c-cta);box-shadow:0 0 12px rgba(97,229,191,.3)}

/* ============ 主区域 ============ */
.main{
  position:relative;z-index:1;
  padding:calc(var(--topbar) + 34px) 20px 70px;
  max-width:1080px;margin:0 auto;
}
.page{display:none;animation:pageIn .45s ease both}
.page.active{display:block}
@keyframes pageIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

.page-head{margin-bottom:22px}
.page-head h2,.panel h3{font-family:var(--font-head);font-weight:700;font-size:24px;letter-spacing:.4px}
.page-head p{color:var(--c-dim);font-size:13px;margin-top:6px}

/* ============ 按钮 ============ */
.btn{
  font-family:var(--font-head);font-weight:600;font-size:14px;letter-spacing:.5px;
  border:1px solid var(--c-border);border-radius:var(--r);padding:12px 22px;transition:.22s;
  background:var(--c-surface);color:var(--c-text);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-cta{
  background:linear-gradient(90deg,var(--c-primary),var(--c-purple));
  border-color:transparent;color:#fff;
  box-shadow:0 0 24px rgba(214,92,168,.4);
}
.btn-cta:hover{box-shadow:0 0 34px rgba(97,229,191,.4)}
.btn-ghost{background:transparent}
.btn-ghost:hover{border-color:var(--c-primary);color:var(--c-primary);box-shadow:0 0 16px rgba(214,92,168,.25)}
.btn-accent{
  background:linear-gradient(90deg,var(--c-cta),var(--c-accent));
  border-color:transparent;color:#0d2418;
  box-shadow:0 0 22px rgba(97,229,191,.35);
}
.btn-danger{background:transparent;color:#ff7b9c;border-color:rgba(214,92,168,.4)}
.btn-danger:hover{border-color:#ff5f8a;box-shadow:0 0 14px rgba(255,95,138,.25)}

/* ============ 首页 ============ */
.hero{text-align:center;padding:44px 0 34px}
.hero-kicker{
  font-size:12px;letter-spacing:3px;color:var(--c-cta);
  text-shadow:0 0 12px rgba(97,229,191,.6);
}
.hero-title{
  font-family:var(--font-head);font-weight:800;font-size:clamp(38px,7vw,64px);
  line-height:1.12;letter-spacing:1px;margin:12px 0 8px;color:var(--c-text);
}
.glow-text{
  background:linear-gradient(90deg,var(--c-primary),var(--c-purple) 50%,var(--c-cta));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 0 18px rgba(214,92,168,.6));
}
.hero-sub{color:var(--c-dim);max-width:560px;margin:0 auto 26px;font-size:14px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:40px;
}
.stat{
  background:linear-gradient(160deg,var(--c-surface),rgba(35,26,32,.4));
  border:1px solid var(--c-border);border-radius:var(--r);padding:16px 10px;
  display:flex;flex-direction:column;gap:4px;
}
.stat b{
  font-family:var(--font-head);font-size:30px;font-weight:700;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat span{font-size:12px;color:var(--c-dim)}
.home-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:30px}
.feature{
  background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r);
  padding:22px 18px;transition:.25s;
}
.feature:hover{border-color:var(--c-primary);transform:translateY(-4px);box-shadow:0 10px 30px rgba(214,92,168,.16)}
.feature-icon{font-size:26px}
.feature h3{font-family:var(--font-head);font-size:17px;margin:10px 0 6px}
.feature p{color:var(--c-dim);font-size:13px}
.quick-pick{
  grid-column:1/-1;position:relative;overflow:hidden;
  background:linear-gradient(120deg,rgba(214,92,168,.22),rgba(97,229,191,.12)),var(--c-surface);
  border:1px solid var(--c-primary);border-radius:var(--r);padding:26px 22px;cursor:pointer;transition:.25s;
}
.quick-pick:hover{box-shadow:0 0 26px rgba(214,92,168,.35);transform:translateY(-3px)}
.qp-label{font-size:12px;letter-spacing:2px;color:var(--c-cta)}
.qp-name{font-family:var(--font-head);font-size:26px;font-weight:700;margin:8px 0 4px;
  background:linear-gradient(90deg,#fff,var(--c-primary));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.qp-desc{color:var(--c-dim);font-size:13px}
.qp-go{
  position:absolute;right:20px;top:50%;transform:translateY(-50%);
  font-family:var(--font-head);color:var(--c-cta);text-shadow:0 0 10px rgba(97,229,191,.7);
}

/* ============ 场景选择 ============ */
.level-tabs{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}
.lvl-btn{
  border:1px solid var(--c-border);background:var(--c-surface);color:var(--c-dim);
  border-radius:var(--r);padding:8px 16px;font-size:13px;transition:.2s;
}
.lvl-btn:hover{color:var(--c-text)}
.lvl-btn.active{
  color:#0d2418;background:linear-gradient(90deg,var(--c-cta),var(--c-accent));
  border-color:transparent;font-weight:700;
}
.scene-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.scene-card{
  background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r);
  overflow:hidden;cursor:pointer;transition:.25s;display:flex;flex-direction:column;
}
.scene-card:hover{transform:translateY(-5px);border-color:var(--c-primary);box-shadow:0 14px 34px rgba(214,92,168,.2)}
.scene-icon{
  height:92px;display:grid;place-items:center;font-size:40px;
  background:radial-gradient(120% 140% at 30% 0%,var(--sg2),var(--sg1));
  border-bottom:1px solid var(--c-border);
}
.scene-body{padding:14px 16px;flex:1;display:flex;flex-direction:column;gap:6px}
.scene-title{font-family:var(--font-head);font-weight:700;font-size:17px}
.scene-desc{color:var(--c-dim);font-size:12px;flex:1}
.scene-meta{display:flex;align-items:center;gap:8px;margin-top:8px}
.badge{font-size:11px;padding:3px 10px;border-radius:var(--r);font-weight:700;letter-spacing:1px}
.badge.b1{color:#0d2418;background:linear-gradient(90deg,var(--c-accent),#9be66b)}
.badge.b2{color:#0d2418;background:linear-gradient(90deg,var(--c-cta),var(--c-accent))}
.badge.b3{color:#fff;background:linear-gradient(90deg,var(--c-primary),var(--c-purple))}
.stars-mini{font-size:12px;letter-spacing:1px;color:var(--c-primary)}
.scene-prog{margin-left:auto;font-size:11px;color:var(--c-dim)}

/* ============ 对话练习 ============ */
#page-practice{display:none;flex-direction:column}
#page-practice.active{display:flex;height:calc(100dvh - var(--topbar) - 34px);min-height:480px}
.pr-head{display:flex;align-items:center;gap:14px;padding:10px 0 12px;border-bottom:1px solid var(--c-border)}
.pr-back{
  border:1px solid var(--c-border);background:var(--c-surface);color:var(--c-dim);
  border-radius:var(--r);padding:8px 14px;font-size:13px;transition:.2s;flex:none;
}
.pr-back:hover{color:var(--c-primary);border-color:var(--c-primary)}
.pr-title-block{display:flex;align-items:center;gap:10px;min-width:0}
.pr-title-block h2{font-family:var(--font-head);font-size:19px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pr-progress{margin-left:auto;display:flex;align-items:center;gap:10px;flex:none}
.pr-progress span{font-size:12px;color:var(--c-dim)}
.bar{width:120px;height:6px;background:var(--c-surface);border:1px solid var(--c-border);border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;width:0;border-radius:6px;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta));transition:width .4s}

.chat{flex:1;overflow-y:auto;padding:20px 4px;display:flex;flex-direction:column;gap:14px;scroll-behavior:smooth}
.msg{display:flex;gap:10px;max-width:84%;animation:popIn .3s ease both}
.msg .avatar{
  width:36px;height:36px;border-radius:50%;flex:none;display:grid;place-items:center;font-size:18px;
  background:var(--c-surface-2);border:1px solid var(--c-border);
}
.msg .bubble{
  padding:11px 15px;border-radius:var(--r);border:1px solid var(--c-border);
  background:var(--c-surface);font-size:14px;word-break:break-word;
}
.msg-ai .bubble{border-left:2px solid var(--c-primary);box-shadow:0 0 16px rgba(214,92,168,.12)}
.msg-user{align-self:flex-end;flex-direction:row-reverse}
.msg-user .bubble{
  background:linear-gradient(135deg,#2d1f2c,#1d2b34);border-color:var(--c-cta);
  box-shadow:0 0 18px rgba(97,229,191,.14);
}
.msg-ai .speak-mini{
  margin-top:6px;font-size:11px;color:var(--c-cta);background:none;border:1px solid var(--c-border);
  border-radius:6px;padding:2px 8px;opacity:.8;transition:.2s;
}
.msg-ai .speak-mini:hover{opacity:1;border-color:var(--c-cta)}
@keyframes popIn{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}

.typing{display:flex;gap:6px;align-items:center}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--c-dim);animation:blink 1s infinite}
.typing i:nth-child(2){animation-delay:.2s}
.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.25}30%{opacity:1}}

/* 反馈面板 */
.feedback{
  border:1px solid var(--c-primary);border-radius:var(--r);margin:4px 0 12px;padding:16px 18px;
  background:linear-gradient(160deg,rgba(214,92,168,.13),rgba(138,75,209,.06)),var(--c-surface);
  box-shadow:0 0 22px rgba(214,92,168,.15);
  animation:pageIn .35s ease both;
}
.fb-top{display:flex;align-items:center;gap:20px;flex-wrap:wrap;justify-content:space-between}
.score-big{display:flex;align-items:baseline;gap:6px}
.score-big b{
  font-family:var(--font-head);font-size:44px;font-weight:800;line-height:1;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 0 12px rgba(214,92,168,.5));
}
.score-big span{color:var(--c-dim);font-size:12px}
.stars{font-size:26px;letter-spacing:4px}
.stars .star{color:var(--c-primary);text-shadow:0 0 12px rgba(214,92,168,.9);animation:starPop .4s ease both}
.stars .off{color:var(--c-border)}
@keyframes starPop{from{transform:scale(0) rotate(-40deg)}to{transform:scale(1) rotate(0)}}
.meters{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.meter p{font-size:11px;color:var(--c-dim);display:flex;justify-content:space-between;margin-bottom:4px}
.meter p b{color:var(--c-text)}
.meter-bar{height:8px;background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:6px;overflow:hidden}
.meter-bar i{display:block;height:100%;border-radius:6px;transition:width .6s ease;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta))}
.tips{margin-top:14px;display:flex;flex-direction:column;gap:8px}
.tip{font-size:13px;color:var(--c-text)}
.tip b{color:var(--c-primary)}
.tip.good b{color:var(--c-accent)}
.model-line{margin-top:12px;font-size:12px;color:var(--c-dim);
  border-top:1px dashed var(--c-border);padding-top:10px}
.model-line b{color:var(--c-cta);cursor:pointer}
.gpt-line{margin-top:8px;font-size:12px;color:var(--c-purple);opacity:.9}

/* 总结 */
.summary{
  border:1px solid var(--c-cta);border-radius:var(--r);padding:22px;text-align:center;
  background:linear-gradient(160deg,rgba(97,229,191,.12),rgba(214,92,168,.08)),var(--c-surface);
  box-shadow:0 0 30px rgba(97,229,191,.15);animation:pageIn .4s ease both;
}
.summary h3{font-family:var(--font-head);font-size:22px;color:var(--c-cta);text-shadow:0 0 14px rgba(97,229,191,.6)}
.summary .sum-row{display:flex;gap:26px;justify-content:center;margin:16px 0;flex-wrap:wrap}
.summary .sum-row div b{font-family:var(--font-head);font-size:26px;display:block;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.summary .sum-row div span{font-size:12px;color:var(--c-dim)}
.summary .s-btn{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* 输入栏 */
.inputbar{
  display:flex;gap:10px;align-items:center;
  background:rgba(35,26,32,.85);border:1px solid var(--c-border);border-radius:var(--r);
  padding:10px;margin-top:4px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.mic-btn,.send-btn{
  width:46px;height:46px;border-radius:var(--r);border:1px solid var(--c-border);font-size:19px;
  background:var(--c-surface-2);color:var(--c-text);transition:.2s;flex:none;
}
.mic-btn:hover,.send-btn:hover{border-color:var(--c-cta);box-shadow:0 0 12px rgba(97,229,191,.3)}
.mic-btn.listening{
  border-color:var(--c-primary);background:linear-gradient(90deg,var(--c-primary),var(--c-purple));
  animation:pulse 1.1s infinite;
}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(214,92,168,.5)}50%{box-shadow:0 0 0 12px rgba(214,92,168,0)}}
.text-input{
  flex:1;min-width:0;height:46px;padding:0 14px;font-size:14px;color:var(--c-text);
  background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--r);
  outline:none;transition:.2s;font-family:var(--font-body);
}
.text-input:focus{border-color:var(--c-primary);box-shadow:0 0 14px rgba(214,92,168,.25)}
.mic-note{min-height:20px;font-size:11px;color:var(--c-dim);text-align:center;padding-top:6px}

/* ============ 学习报告 ============ */
.report-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:18px}
.stat-card{
  background:linear-gradient(160deg,var(--c-surface),rgba(35,26,32,.4));
  border:1px solid var(--c-border);border-radius:var(--r);padding:18px;text-align:center;
}
.stat-card span{font-size:12px;color:var(--c-dim);display:block}
.stat-card b{
  font-family:var(--font-head);font-size:34px;font-weight:700;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.panel{
  background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r);
  padding:20px;margin-bottom:16px;
}
.panel h3{font-size:17px;margin-bottom:14px}
.panel h3 small{font-size:12px;color:var(--c-dim);font-weight:400}
.chart-wrap{width:100%}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}
.day{
  border:1px solid var(--c-border);border-radius:var(--r);padding:10px 4px;text-align:center;
  background:var(--c-surface-2);font-size:11px;color:var(--c-dim);
}
.day b{display:block;font-family:var(--font-head);font-size:16px;color:var(--c-text);margin-top:2px}
.day.done{border-color:var(--c-accent);color:var(--c-accent);
  box-shadow:inset 0 0 12px rgba(78,198,103,.12)}
.day.done b{color:var(--c-accent)}
.day.today{border-color:var(--c-primary);box-shadow:0 0 14px rgba(214,92,168,.3)}
.checkin-row{display:flex;align-items:center;gap:14px;margin-top:16px;flex-wrap:wrap}
.checkin-msg{font-size:13px;color:var(--c-cta)}
.history{list-style:none;display:flex;flex-direction:column;gap:8px;max-height:320px;overflow-y:auto}
.his-item{
  display:flex;align-items:center;gap:12px;padding:10px 14px;
  border:1px solid var(--c-border);border-radius:var(--r);background:var(--c-surface-2);
}
.his-icon{font-size:20px}
.his-name{font-weight:700;font-size:14px;font-family:var(--font-head)}
.his-meta{font-size:11px;color:var(--c-dim)}
.his-score{margin-left:auto;font-family:var(--font-head);font-size:18px;
  background:linear-gradient(90deg,var(--c-primary),var(--c-cta));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.his-stars{font-size:12px;letter-spacing:2px;color:var(--c-primary)}
.empty{color:var(--c-dim);font-size:13px;padding:10px 0}
.field{margin-bottom:14px}
.field label{display:block;font-size:12px;color:var(--c-dim);margin-bottom:6px}
.field select{width:100%;max-width:320px;appearance:none;-webkit-appearance:none;
  background:var(--c-surface-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23ae98a6'/%3E%3C/svg%3E") no-repeat right 12px center}
.data-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}

/* ============ Toast ============ */
.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);z-index:60;
  background:var(--c-surface);border:1px solid var(--c-primary);color:var(--c-text);
  padding:12px 22px;border-radius:var(--r);font-size:13px;opacity:0;pointer-events:none;
  transition:.3s;box-shadow:0 0 24px rgba(214,92,168,.35);max-width:86vw;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ============ 响应式 ============ */
@media (max-width:860px){
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .home-cards{grid-template-columns:1fr 1fr}
  .quick-pick{grid-column:1/-1}
  .meters{grid-template-columns:1fr}
}
@media (max-width:760px){
  .topbar{padding:0 14px}
  .nav{
    position:fixed;left:0;right:0;bottom:0;z-index:50;
    display:grid;grid-template-columns:repeat(4,1fr);
    background:rgba(21,14,19,.94);border-top:1px solid var(--c-border);
    -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  }
  .nav-btn{border-radius:0;padding:13px 0 17px;font-size:12px;border:none!important;
    border-top:2px solid transparent!important}
  .nav-btn.active{background:transparent;border-top:2px solid var(--c-primary)!important;
    box-shadow:none;color:var(--c-primary)}
  .top-actions .streak-pill{display:none}
  .main{padding:calc(var(--topbar) + 22px) 14px 110px}
  #page-practice.active{height:calc(100dvh - var(--topbar) - 8px)}
  .pr-progress .bar{width:70px}
  .msg{max-width:92%}
  .hero{padding:30px 0 26px}
  .hero-stats{margin-top:30px}
  .scene-grid{grid-template-columns:1fr 1fr}
  .feedback{padding:14px}
}
@media (max-width:440px){
  .home-cards{grid-template-columns:1fr}
  .scene-grid{grid-template-columns:1fr}
  .report-grid{grid-template-columns:repeat(2,1fr)}
}