:root {
  --teal-deep: #123832;
  --teal-primary: #1f6f63;
  --teal-light: #4fa392;
  --sage: #8fb89a;
  --coral: #e2593f;
  --tomato: #c8452f;
  --bg: #f7f7f4;
  --bg-card: #ffffff;
  --border: #e3e2dc;
  --text: #1c2b28;
  --text-muted: #62716c;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(18, 56, 50, 0.08), 0 1px 2px rgba(18, 56, 50, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a { color: var(--teal-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: linear-gradient(180deg, var(--teal-deep) 0%, var(--teal-primary) 100%);
  color: #fff;
  padding: 24px 0;
  display: flex;
  flex-direction: column;
}

.sidebar .brand { padding: 0 20px 20px 20px; border-bottom: 1px solid rgba(255,255,255,0.15); margin-bottom: 12px; }
.sidebar .brand h1 { font-size: 20px; letter-spacing: 2px; margin: 0; font-weight: 700; }
.sidebar .brand p { font-size: 11px; opacity: 0.8; margin: 4px 0 0 0; }

.nav-tabs { list-style: none; padding: 0; margin: 0; flex: 1; }
.nav-tabs li a { display: flex; align-items: center; gap: 10px; padding: 12px 20px; color: rgba(255,255,255,0.85); font-size: 14px; border-left: 3px solid transparent; }
.nav-tabs li a:hover { background: rgba(255,255,255,0.08); text-decoration: none; }
.nav-tabs li.active a { background: rgba(255,255,255,0.14); border-left-color: var(--coral); color: #fff; font-weight: 600; }

.sidebar-footer { padding: 16px 20px 0 20px; font-size: 11px; opacity: 0.65; }

.main-content { flex: 1; padding: 28px 36px; max-width: 1200px; }

.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.page-header h2 { margin: 0; font-size: 22px; color: var(--teal-deep); }
.page-header .subtitle { color: var(--text-muted); font-size: 13px; margin-top: 4px; }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 16px; border-radius: 8px; border: none; font-size: 13px; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn-primary { background: var(--teal-primary); color: #fff; }
.btn-primary:hover { background: var(--teal-deep); text-decoration: none; }
.btn-secondary { background: #fff; color: var(--teal-primary); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--teal-primary); text-decoration: none; }
.btn-coral { background: var(--coral); color: #fff; display: flex; justify-content: center; align-items: center; text-align: center; gap: 8px; font-size: 22px; }
.btn-coral:hover { background: var(--tomato); text-decoration: none; }
.btn-danger { background: #fff; color: var(--tomato); border: 1px solid var(--tomato); }
.btn-danger:hover { background: var(--tomato); color: #fff; text-decoration: none; }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 18px; }
.card h3 { margin-top: 0; font-size: 15px; color: var(--teal-deep); border-bottom: 1px solid var(--border); padding-bottom: 10px; margin-bottom: 14px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.4px; }
tr:hover td { background: #fbfaf7; }

.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 12px; font-weight: 600; color: var(--text-muted); margin-bottom: 5px; }
.form-row { display: flex; gap: 14px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 180px; }

input[type=text], input[type=number], input[type=date], input[type=email], input[type=tel],
select, textarea {
  width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 7px;
  font-size: 13px; font-family: inherit; background: #fff; color: var(--text);
}
textarea { resize: vertical; min-height: 80px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--teal-primary); box-shadow: 0 0 0 3px rgba(31,111,99,0.12); }

.search-bar { display: flex; gap: 10px; margin-bottom: 18px; }
.search-bar input { flex: 1; }

.badge { display: inline-block; padding: 3px 9px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.badge-sage { background: rgba(143,184,154,0.25); color: #2f5a3f; }
.badge-coral { background: rgba(226,89,63,0.15); color: var(--tomato); }
.badge-teal { background: rgba(31,111,99,0.12); color: var(--teal-primary); }

.imc-box { padding: 16px; border-radius: var(--radius); background: #f2f6f4; border: 1px dashed var(--sage); text-align: center; }
.imc-box .imc-value { font-size: 34px; font-weight: 700; color: var(--teal-primary); }
.imc-box .imc-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.history-item { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.history-item:last-child { border-bottom: none; }
.history-item .date { color: var(--text-muted); font-size: 11px; }

.checkbox-list { max-height: 320px; overflow-y: auto; border: 1px solid var(--border); border-radius: 8px; padding: 10px; }
.checkbox-item { display: flex; align-items: center; gap: 8px; padding: 6px 4px; border-bottom: 1px solid #f0f0ec; }
.checkbox-item:last-child { border-bottom: none; }
.checkbox-item input[type=checkbox] { width: auto; }
.checkbox-item .ex-details { display: flex; gap: 6px; flex: 1; align-items: center; }
.checkbox-item .ex-details input { padding: 5px 8px; font-size: 12px; }

.empty-state { text-align: center; padding: 50px 20px; color: var(--text-muted); grid-column: 1 / -1; }

.video-card { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: #fff; }
.video-card .thumb { aspect-ratio: 16/9; background: var(--teal-deep) center/cover no-repeat; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 12px; }
.video-card .body { padding: 12px; }
.video-card .body h4 { margin: 0 0 4px 0; font-size: 14px; }
.video-card .body p { margin: 0; font-size: 12px; color: var(--text-muted); }

.filter-pills { display: flex; gap: 8px; margin-bottom: 18px; flex-wrap: wrap; }
.filter-pills a { padding: 6px 14px; border-radius: 20px; background: #fff; border: 1px solid var(--border); font-size: 12px; color: var(--text); }
.filter-pills a.active { background: var(--teal-primary); color: #fff; border-color: var(--teal-primary); }

.toast { position: fixed; bottom: 24px; right: 24px; background: var(--teal-deep); color: #fff; padding: 12px 18px; border-radius: 8px; font-size: 13px; box-shadow: var(--shadow); display: none; z-index: 999; }

.display-shell { min-height: 100vh; background: linear-gradient(160deg, var(--teal-deep), var(--teal-primary)); color: #fff; display: flex; align-items: center; justify-content: center; padding: 40px; }
.display-card { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.15); border-radius: 20px; padding: 48px; max-width: 780px; width: 100%; backdrop-filter: blur(6px); }
.display-card h1 { font-size: 28px; margin-top: 0; }
.display-card .imc-value { font-size: 64px; }
.display-waiting { text-align: center; opacity: 0.85; font-size: 15px; }