:root{
  --bg:#f5f7fb;--card:#fff;--text:#172033;--muted:#768095;--line:#e8ecf4;
  --accent:#4d7df3;--accent-soft:#edf3ff;--green:#1f9d67;--orange:#e58c2f;--red:#d95454;
  --shadow:0 8px 24px rgba(37,58,110,.08);--radius:18px;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Microsoft YaHei",sans-serif}
body{min-height:100vh}
button,input,select{font:inherit}
button{cursor:pointer}
.app-shell{max-width:720px;margin:0 auto;min-height:100vh;padding-bottom:92px}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:22px 18px 10px;position:sticky;top:0;background:rgba(245,247,251,.93);backdrop-filter:blur(16px);z-index:20}
h1{font-size:28px;margin:3px 0 0}.eyebrow{font-size:13px;color:var(--muted)}
.icon-btn{width:42px;height:42px;border:0;border-radius:14px;background:var(--card);box-shadow:var(--shadow);font-size:20px}
main{padding:8px 16px 24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:12px 0;box-shadow:var(--shadow)}
.card h2,.card h3{margin:0 0 12px}.card h2{font-size:18px}.card h3{font-size:16px}
.hero{background:linear-gradient(135deg,#547ff4,#7396fb);color:white;border:0}
.hero .muted{color:rgba(255,255,255,.8)}
.hero-title{font-size:24px;font-weight:750;margin:8px 0}.hero-time{font-size:14px;opacity:.9}
.row{display:flex;gap:10px;align-items:center}.space{justify-content:space-between}.stack{display:grid;gap:10px}
.pill{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:12px;font-weight:700}
.pill.green{background:#eaf8f2;color:var(--green)}.pill.orange{background:#fff4e8;color:var(--orange)}.pill.gray{background:#f0f2f6;color:#687084}
.muted{color:var(--muted)}.small{font-size:12px}.strong{font-weight:700}
.timeline{display:grid;gap:10px}.event{display:grid;grid-template-columns:72px 1fr;gap:12px;padding:11px 0;border-bottom:1px solid var(--line)}.event:last-child{border-bottom:0}
.event-time{font-weight:700;color:#3a4660}.event-title{font-weight:700}.event-sub{font-size:12px;color:var(--muted);margin-top:3px}
.section-title{display:flex;align-items:center;justify-content:space-between;margin:18px 2px 8px}.section-title h2{margin:0;font-size:18px}
.btn{border:0;background:var(--accent);color:#fff;padding:11px 14px;border-radius:12px;font-weight:700}.btn.secondary{background:#eef2fa;color:#34425e}.btn.danger{background:#fff0f0;color:var(--red)}.btn.full{width:100%}
.segmented{display:grid;grid-template-columns:1fr 1fr;background:#e9edf5;border-radius:12px;padding:3px;margin:10px 0 14px}.segmented button{border:0;background:transparent;padding:9px;border-radius:9px;color:var(--muted);font-weight:700}.segmented button.active{background:#fff;color:var(--text);box-shadow:0 2px 8px rgba(40,54,90,.08)}
.week-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:#fff}.week-grid{min-width:720px;display:grid;grid-template-columns:78px repeat(5,1fr)}
.cell{min-height:64px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:8px;font-size:12px}.cell.head{min-height:42px;background:#f7f9fd;font-weight:700;text-align:center}.cell.slot{background:#fbfcfe;font-weight:700;color:#5a657d;position:sticky;left:0;z-index:2}.course-chip{background:#edf3ff;border-radius:10px;padding:7px 8px;margin:3px 0;color:#2f5cc4;font-weight:700}.course-chip.prep{background:#f3eeff;color:#704fc2}.course-chip.adjusted{outline:2px solid #f1b85c}
.form-grid{display:grid;gap:12px}.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}.field input,.field select{width:100%;padding:11px 12px;border:1px solid #dfe5ef;border-radius:12px;background:white;color:var(--text)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:10px}.list-item{padding:12px 0;border-bottom:1px solid var(--line)}.list-item:last-child{border:0}.list-item .title{font-weight:700}.list-item .meta{font-size:12px;color:var(--muted);margin-top:4px}
.notice{padding:12px;border-radius:12px;background:#fff8e9;color:#80601f;font-size:13px;line-height:1.5}.ok{background:#ecf8f2;color:#236c4f}
.bottom-nav{position:fixed;left:50%;transform:translateX(-50%);bottom:0;width:min(720px,100%);height:76px;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:rgba(255,255,255,.96);backdrop-filter:blur(16px);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);z-index:30}
.nav-item{border:0;background:transparent;color:#8a93a6;display:grid;place-items:center;gap:3px}.nav-item span{font-size:20px}.nav-item em{font-size:11px;font-style:normal}.nav-item.active{color:var(--accent);font-weight:700}
.kpi{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.kpi .card{margin:0}.kpi-num{font-size:22px;font-weight:800;margin-top:6px}
@media (min-width:700px){main{padding-left:24px;padding-right:24px}.topbar{padding-left:26px;padding-right:26px}}

/* iPhone form layout fixes */
.field,.two-col,.two-col>*{min-width:0}
.field input,.field select{display:block;min-width:0;max-width:100%;-webkit-appearance:none;appearance:none}
.field input[type="date"]{-webkit-appearance:auto;appearance:auto}
@media (max-width:420px){
  main{padding-left:14px;padding-right:14px}
  .card{padding:16px 14px}
  .two-col{gap:8px}
  .btn{padding-left:10px;padding-right:10px}
}

/* iOS native date control: keep it compact inside the card */
.field input[type="date"]{
  width:100%;
  height:48px;
  min-height:48px;
  max-height:48px;
  padding:0 12px;
  font-size:16px;
  line-height:48px;
  border-radius:12px;
  text-align:left;
  background:#fff;
  box-sizing:border-box;
  color-scheme:light;
}
.field input[type="date"]::-webkit-date-and-time-value{
  text-align:left;
  min-height:0;
  line-height:1.2;
  padding:0;
  margin:0;
}
.field input[type="date"]::-webkit-datetime-edit{
  padding:0;
}
@media (max-width:420px){
  .field input[type="date"]{height:46px;min-height:46px;max-height:46px;line-height:46px;font-size:16px}
}

/* v4: custom visual date field; native iOS picker is transparent overlay */
.date-control{
  position:relative;
  width:100%;
  height:46px;
  min-height:46px;
  border:1px solid #dfe5ef;
  border-radius:12px;
  background:#fff;
  overflow:hidden;
}
.date-display{
  display:flex;
  align-items:center;
  width:100%;
  height:100%;
  padding:0 12px;
  color:var(--text);
  font:inherit;
  font-size:16px;
  line-height:1;
  text-align:left;
  white-space:nowrap;
  pointer-events:none;
}
.date-native{
  position:absolute !important;
  inset:0 !important;
  width:100% !important;
  height:100% !important;
  min-width:0 !important;
  min-height:0 !important;
  max-width:none !important;
  max-height:none !important;
  padding:0 !important;
  margin:0 !important;
  border:0 !important;
  opacity:0 !important;
  background:transparent !important;
  -webkit-appearance:auto !important;
  appearance:auto !important;
  cursor:pointer;
}