:root {
  --blue:     #2563eb;
  --blue-lt:  #4f86f7;
  --blue-dim: rgba(37,99,235,0.10);
  --green:    #22c55e;
  --tr:       0.15s ease;
  --tr-m:     0.3s ease;
  --rad:      12px;
  --rad-sm:   8px;
  --rad-pill: 999px;
}
[data-theme="dark"] {
  --bg:#0e0e0e; --c1:#161616; --c2:#1e1e1e; --c3:#282828;
  --ln:rgba(255,255,255,0.07); --lnhi:rgba(255,255,255,0.13);
  --t1:#ededed; --t2:#999; --t3:#4a4a4a;
}
[data-theme="light"] {
  --bg:#f3f3f3; --c1:#fff; --c2:#eee; --c3:#e2e2e2;
  --ln:rgba(0,0,0,0.07); --lnhi:rgba(0,0,0,0.14);
  --t1:#111; --t2:#3d3d3d; --t3:#808080;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:'Geist',system-ui,sans-serif;
  background:var(--bg);color:var(--t1);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  transition:background var(--tr-m),color var(--tr-m);
}

/* ── AUTH ─── */
#auth-screen{
  min-height:100vh;display:flex;
  align-items:center;justify-content:center;padding:24px;
}
.auth-box{
  background:var(--c1);border:1px solid var(--lnhi);
  border-radius:20px;padding:40px 36px;
  width:min(420px,100%);
  box-shadow:0 32px 80px rgba(0,0,0,0.4);
  animation:fadeUp 0.4s ease both;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

.auth-logo{font-size:1rem;font-weight:800;letter-spacing:-0.02em;color:var(--t1);margin-bottom:28px;}
.auth-logo span{color:var(--blue-lt);}
.auth-title{font-size:1.4rem;font-weight:900;letter-spacing:-0.03em;color:var(--t1);margin-bottom:6px;}
.auth-sub{font-size:0.78rem;color:var(--t2);margin-bottom:28px;line-height:1.5;}

.auth-tabs{display:flex;gap:4px;background:var(--c2);border-radius:var(--rad-pill);padding:3px;margin-bottom:22px;}
.auth-tab{
  flex:1;padding:7px;border-radius:var(--rad-pill);border:none;
  background:transparent;color:var(--t2);
  font-family:'Geist',sans-serif;font-size:0.75rem;font-weight:600;
  cursor:pointer;transition:all var(--tr);
}
.auth-tab.active{background:var(--c1);color:var(--t1);box-shadow:0 1px 4px rgba(0,0,0,0.15);}

.auth-field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px;}
.auth-label{font-size:0.68rem;font-weight:600;color:var(--t2);letter-spacing:0.04em;}
.auth-input{
  background:var(--c2);border:1px solid var(--ln);
  border-radius:var(--rad-sm);color:var(--t1);
  font-family:'Geist',sans-serif;font-size:0.82rem;
  padding:10px 14px;outline:none;transition:border-color var(--tr);
}
.auth-input::placeholder{color:var(--t3);}
.auth-input:focus{border-color:var(--blue);}

.auth-btn{
  width:100%;padding:11px;border-radius:var(--rad-sm);border:none;
  background:var(--t1);color:var(--bg);
  font-family:'Geist',sans-serif;font-size:0.82rem;font-weight:800;
  cursor:pointer;transition:opacity var(--tr);margin-top:6px;
}
.auth-btn:hover{opacity:0.85;}
.auth-btn:disabled{opacity:0.4;cursor:not-allowed;}

.auth-divider{display:flex;align-items:center;gap:10px;margin:16px 0;}
.auth-divider::before,.auth-divider::after{content:'';flex:1;height:1px;background:var(--ln);}
.auth-divider span{font-size:0.62rem;color:var(--t3);font-weight:500;}

.auth-google{
  width:100%;padding:10px;border-radius:var(--rad-sm);
  border:1px solid var(--ln);background:transparent;color:var(--t1);
  font-family:'Geist',sans-serif;font-size:0.78rem;font-weight:600;
  cursor:pointer;transition:all var(--tr);
  display:flex;align-items:center;justify-content:center;gap:8px;
}
.auth-google:hover{border-color:var(--lnhi);background:var(--c2);}
.auth-google svg{width:16px;height:16px;flex-shrink:0;}

.auth-err{
  background:rgba(220,60,60,0.1);border:1px solid rgba(220,60,60,0.25);
  border-radius:var(--rad-sm);padding:9px 12px;
  font-size:0.72rem;color:#e05252;margin-top:10px;display:none;
}
.auth-err.show{display:block;}
.auth-msg{
  background:rgba(34,197,94,0.1);border:1px solid rgba(34,197,94,0.25);
  border-radius:var(--rad-sm);padding:9px 12px;
  font-size:0.72rem;color:var(--green);margin-top:10px;display:none;
}
.auth-msg.show{display:block;}

/* ── DASHBOARD ─── */
#dashboard{display:none;min-height:100vh;}

.db-bar{
  position:sticky;top:0;z-index:20;
  background:var(--c1);border-bottom:1px solid var(--ln);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 32px;height:56px;
  animation:fadeDown 0.35s ease both;
}
@keyframes fadeDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

.db-bar-left{display:flex;align-items:center;gap:16px;}
.db-bar-right{display:flex;align-items:center;gap:10px;}
.db-logo{font-size:0.88rem;font-weight:800;letter-spacing:-0.01em;color:var(--t1);text-decoration:none;}
.db-logo span{color:var(--blue-lt);}
.db-back{
  display:flex;align-items:center;gap:5px;
  font-size:0.72rem;font-weight:500;color:var(--t2);
  text-decoration:none;padding:5px 12px;
  border-radius:var(--rad-pill);border:1px solid var(--ln);
  background:transparent;cursor:pointer;transition:all var(--tr);
}
.db-back:hover{border-color:var(--lnhi);color:var(--t1);}
.db-avatar{
  width:30px;height:30px;border-radius:50%;
  background:var(--blue);color:#fff;
  font-size:0.72rem;font-weight:800;
  display:flex;align-items:center;justify-content:center;
}
.db-uname{font-size:0.75rem;font-weight:600;color:var(--t1);}
.db-btn{
  padding:5px 12px;border-radius:var(--rad-pill);
  border:1px solid var(--ln);background:transparent;color:var(--t2);
  font-family:'Geist',sans-serif;font-size:0.68rem;font-weight:600;
  cursor:pointer;transition:all var(--tr);
}
.db-btn:hover{border-color:var(--lnhi);color:var(--t1);}

.db-content{
  max-width:900px;margin:0 auto;
  padding:36px 32px 64px;
  display:flex;flex-direction:column;gap:28px;
  animation:fadeIn 0.4s 0.1s ease both;
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

.db-section-lbl{
  font-size:0.6rem;font-weight:700;
  letter-spacing:0.14em;text-transform:uppercase;
  color:var(--t3);margin-bottom:10px;
}

/* hero */
.db-hero{
  display:flex;align-items:center;gap:20px;
  padding:26px 28px;background:var(--c1);
  border-radius:var(--rad);border:1px solid var(--ln);
  position:relative;overflow:hidden;
}
.db-hero::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(37,99,235,0.07) 0%,transparent 55%);
  pointer-events:none;
}
.db-hero-av{
  width:56px;height:56px;border-radius:50%;
  background:var(--blue);color:#fff;
  font-size:1.4rem;font-weight:900;
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;border:3px solid rgba(79,134,247,0.3);
}
.db-hero-name{font-size:1.2rem;font-weight:900;letter-spacing:-0.02em;color:var(--t1);}
.db-hero-email{font-size:0.72rem;color:var(--t2);margin-top:3px;}
.db-hero-joined{font-size:0.62rem;color:var(--t3);margin-top:6px;}

/* streak */
.db-streak-card{
  display:flex;align-items:center;gap:20px;
  padding:24px 28px;background:var(--c1);
  border-radius:var(--rad);border:1px solid var(--ln);
  position:relative;overflow:hidden;
}
.db-streak-card::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(130deg,rgba(37,99,235,0.07) 0%,transparent 50%);
  pointer-events:none;
}
.db-flame{font-size:3rem;line-height:1;flex-shrink:0;}
.db-flame.hot{animation:flamePulse 1.6s ease-in-out infinite;}
@keyframes flamePulse{
  0%,100%{transform:scale(1) rotate(-2deg);}
  50%{transform:scale(1.12) rotate(2deg);}
}
.db-streak-main{flex:1;}
.db-streak-num{
  font-size:3rem;font-weight:900;
  letter-spacing:-0.06em;line-height:1;color:var(--t1);
}
.db-streak-num em{font-size:1.1rem;font-weight:500;font-style:normal;color:var(--t2);letter-spacing:0;}
.db-streak-sub{font-size:0.72rem;color:var(--t3);margin-top:6px;}
.db-streak-sub strong{color:var(--t2);font-weight:600;}
.db-badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;}
.db-badge{
  padding:5px 12px;border-radius:var(--rad-pill);
  background:var(--c2);border:1px solid var(--ln);
  font-size:0.65rem;font-weight:700;color:var(--t2);
}
.db-badge.earned{background:var(--blue-dim);border-color:rgba(37,99,235,0.25);color:var(--blue-lt);}

/* stats grid */
.db-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;}
.db-stat{
  background:var(--c1);border-radius:var(--rad-sm);
  border:1px solid var(--ln);padding:18px 18px 14px;
  transition:border-color var(--tr);
}
.db-stat:hover{border-color:var(--lnhi);}
.db-stat-val{font-size:1.9rem;font-weight:900;letter-spacing:-0.04em;color:var(--t1);line-height:1;}
.db-stat-lbl{font-size:0.58rem;font-weight:600;text-transform:uppercase;letter-spacing:0.1em;color:var(--t3);margin-top:6px;}
.db-stat.hi .db-stat-val{color:var(--blue-lt);}

/* heatmap */
.db-hm-card{background:var(--c1);border-radius:var(--rad);border:1px solid var(--ln);padding:22px 24px;}
.db-hm-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px;}
.db-hm-title{font-size:0.88rem;font-weight:700;color:var(--t1);}
.db-hm-legend{display:flex;align-items:center;gap:4px;}
.db-hm-legend span{font-size:0.58rem;color:var(--t3);}
.db-month-row{display:flex;gap:3px;padding-left:22px;margin-bottom:4px;min-height:14px;}
.db-month-lbl{font-size:0.52rem;font-weight:600;text-transform:uppercase;letter-spacing:0.06em;color:var(--t3);width:15px;flex-shrink:0;white-space:nowrap;}
.db-heatmap{display:flex;gap:3px;overflow-x:auto;padding-bottom:4px;}
.db-heatmap::-webkit-scrollbar{height:3px;}
.db-heatmap::-webkit-scrollbar-thumb{background:var(--lnhi);border-radius:2px;}
.hm-col{display:flex;flex-direction:column;gap:3px;flex-shrink:0;}
.hm-col.lbl-col .hm-cell{
  width:20px;background:transparent;
  font-size:0.48rem;font-weight:600;text-transform:uppercase;
  letter-spacing:0.03em;color:var(--t3);
  display:flex;align-items:center;
}
.hm-cell{width:12px;height:12px;border-radius:2px;background:var(--c3);transition:opacity var(--tr);}
.hm-cell:hover{opacity:0.7;}
.hm-cell.lv0{background:var(--c3);}
.hm-cell.lv1{background:rgba(37,99,235,0.25);}
.hm-cell.lv2{background:rgba(37,99,235,0.50);}
.hm-cell.lv3{background:rgba(37,99,235,0.75);}
.hm-cell.lv4{background:var(--blue-lt);}
.hm-cell.today-cell{outline:2px solid var(--blue-lt);outline-offset:1px;}

/* history */
.db-hist-card{background:var(--c1);border-radius:var(--rad);border:1px solid var(--ln);overflow:hidden;}
.db-hist-head{display:flex;align-items:center;justify-content:space-between;padding:18px 22px 14px;border-bottom:1px solid var(--ln);}
.db-hist-title{font-size:0.88rem;font-weight:700;color:var(--t1);}
.db-hist-cnt{font-size:0.68rem;color:var(--t3);}
.db-hist-list{max-height:420px;overflow-y:auto;}
.db-hist-list::-webkit-scrollbar{width:3px;}
.db-hist-list::-webkit-scrollbar-thumb{background:var(--lnhi);}
.db-hist-item{
  display:flex;align-items:center;gap:14px;
  padding:12px 22px;border-bottom:1px solid var(--ln);
  transition:background var(--tr);
}
.db-hist-item:last-child{border-bottom:none;}
.db-hist-item:hover{background:var(--c2);}
.db-hist-dot{width:7px;height:7px;border-radius:50%;background:var(--blue-lt);flex-shrink:0;}
.db-hist-info{flex:1;min-width:0;}
.db-hist-label{font-size:0.78rem;font-weight:500;color:var(--t1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.db-hist-meta{font-size:0.62rem;color:var(--t3);margin-top:2px;}
.db-hist-dur{font-size:0.72rem;font-weight:700;color:var(--t2);flex-shrink:0;font-feature-settings:"tnum";}

.db-empty{text-align:center;padding:40px 20px;font-size:0.75rem;color:var(--t3);line-height:1.8;}

/* cta */
.db-cta{
  display:flex;align-items:center;gap:16px;
  padding:20px 24px;background:var(--blue-dim);
  border-radius:var(--rad);border:1px solid rgba(37,99,235,0.2);
}
.db-cta-ico{font-size:1.6rem;flex-shrink:0;}
.db-cta-body{flex:1;}
.db-cta-body strong{font-size:0.82rem;font-weight:700;color:var(--t1);display:block;margin-bottom:3px;}
.db-cta-body span{font-size:0.7rem;color:var(--t2);}
.db-cta-btn{
  padding:9px 20px;border-radius:var(--rad-pill);border:none;
  background:var(--blue);color:#fff;
  font-family:'Geist',sans-serif;font-size:0.72rem;font-weight:700;
  cursor:pointer;transition:opacity var(--tr);white-space:nowrap;flex-shrink:0;
}
.db-cta-btn:hover{opacity:0.85;}

.spinner{width:18px;height:18px;border-radius:50%;border:2px solid var(--ln);border-top-color:var(--blue);animation:spin 0.7s linear infinite;margin:0 auto;}
@keyframes spin{to{transform:rotate(360deg)}}

#db-toast{
  position:fixed;bottom:20px;left:50%;
  transform:translateX(-50%) translateY(10px);
  background:var(--c1);border:1px solid var(--lnhi);
  border-radius:var(--rad-pill);padding:8px 20px;
  font-size:0.68rem;font-weight:500;color:var(--t1);
  opacity:0;transition:all 0.25s;pointer-events:none;
  z-index:999;white-space:nowrap;
  box-shadow:0 4px 24px rgba(0,0,0,0.2);
}
#db-toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

@media(max-width:640px){
  .db-bar{padding:0 16px;}
  .db-content{padding:20px 16px 48px;}
  .db-stats{grid-template-columns:1fr 1fr;}
  .db-hero{flex-direction:column;align-items:flex-start;}
  .db-streak-card{flex-direction:column;align-items:flex-start;gap:12px;}
  .db-streak-num{font-size:2.2rem;}
}