:root{
  --bg-0:#14161a;
  --card:#1c1f24;
  --card-hi:#21252b;
  --border:rgba(255,255,255,0.07);
  --border-hi:rgba(143,166,245,0.5);
  --ink-0:#eae8e4;
  --ink-1:#b7b6b3;
  --ink-2:#95938e;
  --accent:#3e5fe0;
  --accent-hi:#8fa6f5;
  --danger:#e5484d;
  --warning:#e0a53e;
  --success:#5fb98c;
  --radius-md:12px;
  --radius-sm:10px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{height:100%;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg-0);
  color:var(--ink-0);
  -webkit-font-smoothing:antialiased;
}

.auth-shell{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.auth-card{
  width:100%;
  max-width:420px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:28px 24px;
}
.auth-eyebrow{
  font-size:12px;
  letter-spacing:0.1em;
  text-transform:uppercase;
  color:var(--ink-2);
  font-weight:600;
  margin:0 0 6px;
}
.auth-title{
  font-size:22px;
  font-weight:700;
  margin:0 0 20px;
  color:var(--ink-0);
}
.auth-subtitle{
  font-size:14px;
  line-height:1.55;
  color:var(--ink-1);
  margin:-12px 0 22px;
}

.field{
  margin-bottom:16px;
}
.field label{
  display:block;
  font-size:13px;
  font-weight:600;
  color:var(--ink-1);
  margin-bottom:7px;
}
.field-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}
.field input{
  width:100%;
  min-height:48px;
  padding:12px 14px;
  font-size:15.5px;
  color:var(--ink-0);
  background:var(--bg-0);
  border:1.5px solid var(--border);
  border-radius:var(--radius-sm);
  outline:none;
  transition:border-color .15s ease;
}
.field input:focus{border-color:var(--border-hi);}
.field input::placeholder{color:var(--ink-2);}
.field-help{
  font-size:12px;
  color:var(--ink-2);
  margin-top:6px;
}

.otp-input{
  text-align:center;
  font-size:24px;
  letter-spacing:0.5em;
  font-variant-numeric:tabular-nums;
  padding-left:22px; /* optical centering against the letter-spacing */
}

.btn{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  min-height:48px;
  padding:13px 18px;
  font-size:15.5px;
  font-weight:600;
  border-radius:var(--radius-sm);
  border:none;
  cursor:pointer;
  transition:transform .15s ease, filter .2s ease, background .15s ease;
}
.btn:active{transform:scale(0.98);}
.btn-primary{
  background:var(--accent);
  color:#ffffff;
}
.btn-primary:active{filter:brightness(0.95);}
.btn-secondary{
  background:transparent;
  color:var(--ink-1);
  border:1px solid var(--border);
}
.btn-secondary:active{background:rgba(255,255,255,0.05);}
.btn-link{
  background:none;
  border:none;
  color:var(--accent-hi);
  font-size:13.5px;
  font-weight:600;
  cursor:pointer;
  padding:8px 0;
  min-height:44px;
}
.btn[disabled]{opacity:0.5; cursor:default;}

.alert{
  font-size:13.5px;
  line-height:1.5;
  padding:12px 14px;
  border-radius:var(--radius-sm);
  margin-bottom:18px;
}
.alert-error{
  background:rgba(229,72,77,0.1);
  border:1px solid rgba(229,72,77,0.35);
  color:#f2a8ab;
}
.alert-info{
  background:rgba(143,166,245,0.08);
  border:1px solid var(--border-hi);
  color:var(--ink-1);
}
.alert ul{margin:0; padding-left:18px;}

.auth-footer{
  text-align:center;
  font-size:13.5px;
  color:var(--ink-2);
  margin-top:18px;
}
.auth-footer a{color:var(--accent-hi); text-decoration:none; font-weight:600;}

.profile-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
  margin:20px 0 24px;
}
.profile-row{
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:12px 14px;
  background:var(--bg-0);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  font-size:14px;
}
.profile-row .label{color:var(--ink-2);}
.profile-row .value{color:var(--ink-0); font-weight:600; text-align:right;}

@media (min-width:480px){
  .auth-card{padding:36px 32px;}
}

/* =====================================================================
   APP SHELL — authenticated pages (Today / Schedule / Habits / Review)
   ===================================================================== */
.app-shell{
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
.app-topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 20px;
  border-bottom:1px solid var(--border);
}
.app-brand{
  font-size:13px;
  font-weight:700;
  letter-spacing:0.04em;
  color:var(--ink-0);
  text-decoration:none;
}
.account-link{
  width:36px;height:36px;
  border-radius:50%;
  background:var(--card);
  border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  color:var(--ink-1);
  font-size:13px;
  font-weight:700;
  text-decoration:none;
  flex:0 0 auto;
}
.app-main{
  flex:1;
  padding:20px 20px 100px;
  max-width:640px;
  width:100%;
  margin:0 auto;
  box-sizing:border-box;
}

.nav-bar{
  position:fixed;
  left:0;right:0;bottom:0;
  display:flex;
  background:var(--card);
  border-top:1px solid var(--border);
  padding-bottom:env(safe-area-inset-bottom,0px);
  z-index:20;
}
.nav-item{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:3px;
  padding:9px 0 8px;
  min-height:56px;
  color:var(--ink-2);
  text-decoration:none;
  font-size:11px;
  font-weight:600;
}
.nav-item .nav-icon{font-size:19px; line-height:1;}
.nav-item.active{color:var(--accent-hi);}

.nav-sidebar{display:none;}

@media (min-width:900px){
  .app-shell{flex-direction:row;}
  .app-topbar{display:none;}
  .nav-bar{display:none;}
  .nav-sidebar{
    display:flex;
    flex-direction:column;
    width:220px;
    flex:0 0 auto;
    background:var(--card);
    border-right:1px solid var(--border);
    padding:24px 14px;
    gap:4px;
  }
  .nav-sidebar .app-brand{padding:0 10px; margin-bottom:18px; font-size:14px;}
  .nav-sidebar .nav-item{
    flex-direction:row;
    justify-content:flex-start;
    gap:10px;
    padding:11px 12px;
    border-radius:var(--radius-sm);
    font-size:14px;
    min-height:auto;
  }
  .nav-sidebar .nav-item.active{background:var(--card-hi); color:var(--ink-0);}
  .nav-sidebar .account-link{margin:14px 10px 0;}
  .app-main{max-width:760px; padding:32px 32px 32px; margin:0;}
}

.section-label{
  font-size:12px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--ink-2);
  font-weight:600;
  margin:24px 0 10px;
}
.section-label:first-child{margin-top:0;}

.empty-state{
  padding:20px 16px;
  border:1px dashed var(--border);
  border-radius:var(--radius-sm);
  color:var(--ink-2);
  font-size:13.5px;
  text-align:center;
}

.flash{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:12px 14px;
  border-radius:var(--radius-sm);
  background:rgba(95,185,140,0.1);
  border:1px solid rgba(95,185,140,0.35);
  color:var(--ink-0);
  font-size:13.5px;
  margin-bottom:18px;
}
.flash a{color:var(--accent-hi); font-weight:600; text-decoration:none;}

/* =====================================================================
   TASK CARD — SOP §5.1 (5 states, distinct icon + treatment, 3 actions)
   ===================================================================== */
.task-card{
  padding:14px 16px;
  background:var(--card);
  border:1px solid var(--border);
  border-left:3px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:10px;
}
.task-card .task-row{display:flex; align-items:flex-start; gap:12px;}
.task-card .task-icon{
  flex:0 0 auto;
  width:28px;height:28px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:13px;
  background:var(--bg-0);
  color:var(--ink-2);
  border:1px solid var(--border);
}
.task-card .task-body{flex:1; min-width:0;}
.task-card .task-title{font-size:14.5px; font-weight:600; color:var(--ink-0);}
.task-card .task-meta{font-size:12.5px; color:var(--ink-2); margin-top:3px;}
.task-card .task-dependency{
  display:inline-flex; align-items:center; gap:4px;
  font-size:11.5px; color:var(--ink-2); margin-top:4px;
}
.task-card.priority{border-left-color:var(--accent); background:var(--card-hi);}
.task-card.state-done{opacity:0.62;}
.task-card.state-done .task-icon{background:var(--success); border-color:var(--success); color:#0d1a14;}
.task-card.state-cancelled{opacity:0.55;}
.task-card.state-cancelled .task-icon{background:var(--danger); border-color:var(--danger); color:#2a0d0e;}
.task-card.state-rescheduled .task-icon{background:var(--warning); border-color:var(--warning); color:#2a1c05;}
.task-card.state-overdue{border-left-color:var(--danger);}
.task-card .task-actions{display:flex; gap:8px; margin-top:10px;}
.task-card .task-actions form{flex:1; margin:0;}
.task-card .task-actions button, .task-card .task-actions a{
  width:100%;
  min-height:38px;
  font-size:12.5px;
  font-weight:600;
  border-radius:var(--radius-sm);
  border:1px solid var(--border);
  background:var(--bg-0);
  color:var(--ink-1);
  cursor:pointer;
  text-align:center;
  text-decoration:none;
  display:flex;align-items:center;justify-content:center;
}

/* =====================================================================
   CHECKLIST — SOP §5.2 (single tap, grouped by trigger, collapses)
   ===================================================================== */
.checklist-group{margin-bottom:20px;}
.checklist-group.complete .checklist-items{display:none;}
.checklist-group-header{
  display:flex; align-items:center; justify-content:space-between;
  font-size:13px; font-weight:600; color:var(--ink-1);
  margin-bottom:8px;
}
.checklist-row{
  display:flex; align-items:center; gap:12px;
  padding:12px 14px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:8px;
  min-height:48px;
}
.checklist-row form{margin:0; display:contents;}
.checklist-row button{
  all:unset;
  display:flex; align-items:center; gap:12px;
  width:100%; cursor:pointer;
}
.checklist-row .check{
  flex:0 0 auto;
  width:22px;height:22px;
  border-radius:6px;
  border:1.5px solid var(--border-hi);
  display:flex;align-items:center;justify-content:center;
  color:transparent;
}
.checklist-row.checked .check{background:var(--accent); border-color:var(--accent); color:#fff;}
.checklist-row.checked .check::after{content:"✓"; font-size:13px;}
.checklist-row .label{flex:1; font-size:14px; color:var(--ink-0); text-align:left;}
.checklist-row.checked .label{color:var(--ink-2); text-decoration:line-through;}

/* =====================================================================
   HABIT CARD — SOP §5.3 (ring toward threshold, never raw decimal)
   ===================================================================== */
.habit-card{
  display:flex; align-items:center; gap:14px;
  padding:14px 16px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:10px;
}
.habit-ring{
  flex:0 0 auto;
  width:48px;height:48px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:conic-gradient(var(--accent) calc(var(--pct,0) * 1%), var(--border) 0);
}
.habit-ring span{
  width:38px;height:38px;
  border-radius:50%;
  background:var(--card);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;
  font-weight:700;
  color:var(--ink-0);
}
.habit-card .habit-body{flex:1; min-width:0;}
.habit-card .habit-name{font-size:14.5px; font-weight:600; color:var(--ink-0);}
.habit-card .habit-params{font-size:12px; color:var(--ink-2); margin-top:3px;}
.habit-card .habit-log-btn{
  flex:0 0 auto;
  min-width:44px;min-height:44px;
  border-radius:50%;
  border:1px solid var(--border-hi);
  background:var(--bg-0);
  color:var(--accent-hi);
  font-size:18px;
  display:flex;align-items:center;justify-content:center;
  text-decoration:none;
}

/* =====================================================================
   NOTIFICATIONS / ALERTS — SOP §5.4 (distinct by tier, plain language)
   ===================================================================== */
.alert-tier1{
  background:rgba(229,72,77,0.12);
  border:1px solid rgba(229,72,77,0.4);
  color:var(--ink-0);
  padding:13px 14px;
  border-radius:var(--radius-sm);
  font-size:13.5px;
  line-height:1.5;
  margin-bottom:12px;
  display:flex; gap:10px; align-items:flex-start;
}
.alert-tier1 .dot{
  flex:0 0 auto; width:8px;height:8px;border-radius:50%;
  background:var(--danger); margin-top:5px;
}
.alert-digest{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:12px 14px;
  font-size:13px;
  color:var(--ink-1);
  margin-bottom:10px;
}

/* =====================================================================
   REVIEW — plain CSS trend bars and stat tiles, no chart library (§4.4)
   ===================================================================== */
.view-toggle{
  display:flex;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:3px;
  margin-bottom:20px;
}
.view-toggle a{
  flex:1;
  text-align:center;
  padding:9px 0;
  font-size:13.5px;
  font-weight:600;
  color:var(--ink-2);
  text-decoration:none;
  border-radius:calc(var(--radius-sm) - 3px);
}
.view-toggle a.active{
  background:var(--accent);
  color:#ffffff;
}

.stat-row{
  display:flex;
  gap:10px;
  margin-bottom:20px;
}
.stat-tile{
  flex:1;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:14px;
  text-align:center;
}
.stat-tile .stat-value{
  font-size:22px;
  font-weight:700;
  color:var(--ink-0);
  font-variant-numeric:tabular-nums;
}
.stat-tile .stat-label{
  font-size:11.5px;
  color:var(--ink-2);
  margin-top:4px;
}

.trend-chart{
  display:flex;
  align-items:flex-end;
  gap:6px;
  height:90px;
  margin-bottom:20px;
  padding:0 4px;
}
.trend-bar{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:flex-end;
  gap:6px;
  height:100%;
}
.trend-bar .bar{
  width:100%;
  max-width:28px;
  background:var(--accent);
  border-radius:4px 4px 0 0;
  min-height:3px;
}
.trend-bar .bar-label{
  font-size:10.5px;
  color:var(--ink-2);
  font-variant-numeric:tabular-nums;
}