:root{
  --bg-deep:#f5f6fb;
  --bg-panel:#ffffff;
  --bg-panel-2:#fbfbfe;
  --border:#e3e6f0;
  --text:#1c2236;
  --text-dim:#5c6480;
  --text-faint:#9aa1ba;
  --accent:#6d4cff;
  --accent-2:#15b8a6;
  --accent-grad: linear-gradient(135deg,#6d4cff 0%,#15b8a6 100%);
  --danger:#e63b62;
  --success:#16b87f;
  --warn:#e08a1c;
  --radius:14px;
  --shadow-lg: 0 24px 50px -20px rgba(30,35,70,.18);
  --shadow-sm: 0 6px 20px -10px rgba(30,35,70,.10);
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(109,76,255,.08), transparent 60%),
    radial-gradient(900px 600px at 110% 10%, rgba(21,184,166,.08), transparent 55%),
    var(--bg-deep);
  color:var(--text);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{margin:0 0 .4em;font-weight:700;letter-spacing:-.02em;}
p{margin:0 0 1em;color:var(--text-dim);}

.container{max-width:1180px;margin:0 auto;padding:0 24px;}

/* ===== Navbar ===== */
.navbar{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.78);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.navbar .inner{display:flex;align-items:center;justify-content:space-between;height:68px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--text);}
.brand .logo-dot{
  width:34px;height:34px;border-radius:10px;
  background:var(--accent-grad);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 18px -6px rgba(109,76,255,.5);
  font-size:16px;
}
.nav-links{display:flex;gap:28px;align-items:center;}
.nav-links a{color:var(--text-dim);font-weight:500;font-size:14.5px;transition:color .2s;}
.nav-links a:hover{color:var(--text);}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:10px;border:1px solid transparent;
  font-weight:600;font-size:14.5px;cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease, opacity .15s ease, background .15s ease;
  font-family:inherit;
}
.btn:active{transform:translateY(1px) scale(.99);}
.btn-primary{
  background:var(--accent-grad);color:#fff;
  box-shadow:0 10px 24px -10px rgba(109,76,255,.55);
}
.btn-primary:hover{box-shadow:0 14px 30px -10px rgba(109,76,255,.7);}
.btn-secondary{
  background:#fff;color:var(--text);border-color:var(--border);
  box-shadow:0 1px 2px rgba(20,25,50,.04);
}
.btn-secondary:hover{border-color:#c7cce0;background:#fafbff;}
.btn-danger{background:rgba(230,59,98,.08);color:var(--danger);border-color:rgba(230,59,98,.25);}
.btn-danger:hover{background:rgba(230,59,98,.14);}
.btn-ghost{background:transparent;color:var(--text-dim);}
.btn-ghost:hover{color:var(--text);}
.btn-sm{padding:8px 14px;font-size:13px;border-radius:8px;}
.btn-block{width:100%;}
.btn[disabled]{opacity:.5;cursor:not-allowed;}

/* ===== Cards / panels ===== */
.card{
  background:linear-gradient(180deg,var(--bg-panel),var(--bg-panel-2));
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px;
  box-shadow:var(--shadow-sm);
}
.card-lg{padding:36px;}

.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:100px;font-size:12px;font-weight:600;
  background:rgba(109,76,255,.08);color:#5a3fe0;border:1px solid rgba(109,76,255,.22);
}
.badge-success{background:rgba(22,184,127,.1);color:var(--success);border-color:rgba(22,184,127,.28);}
.badge-warn{background:rgba(224,138,28,.1);color:var(--warn);border-color:rgba(224,138,28,.28);}
.badge-danger{background:rgba(230,59,98,.1);color:var(--danger);border-color:rgba(230,59,98,.28);}

/* ===== Forms ===== */
label{display:block;font-size:13.5px;font-weight:600;color:var(--text-dim);margin-bottom:7px;}
input[type=text],input[type=password],input[type=email],input[type=date],input[type=time],
input[type=number],select,textarea{
  width:100%;padding:12px 14px;border-radius:10px;
  background:#fff;border:1px solid var(--border);
  color:var(--text);font-size:14.5px;font-family:inherit;
  transition:border-color .15s, box-shadow .15s;
}
input::placeholder,textarea::placeholder{color:var(--text-faint);}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(109,76,255,.14);
}
.field{margin-bottom:20px;}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.hint{font-size:12.5px;color:var(--text-faint);margin-top:6px;}

.toggle-group{display:flex;gap:10px;}
.toggle-option{
  flex:1;padding:14px;border-radius:10px;border:1px solid var(--border);
  background:#fff;cursor:pointer;text-align:center;font-weight:600;font-size:14px;
  color:var(--text-dim);transition:all .15s;
}
.toggle-option.active{
  border-color:var(--accent);color:#3f2db8;
  background:linear-gradient(135deg, rgba(109,76,255,.10), rgba(21,184,166,.08));
  box-shadow:0 0 0 1px var(--accent) inset;
}

/* ===== Hero ===== */
.hero{padding:90px 0 60px;text-align:center;}
.hero h1{font-size:48px;line-height:1.08;max-width:760px;margin:0 auto .22em;color:var(--text);}
.hero .gradient-text{
  background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{font-size:18px;max-width:560px;margin:0 auto 36px;}

.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:60px;}
.feature-card{padding:24px;text-align:left;}
.feature-icon{
  width:42px;height:42px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:rgba(109,76,255,.08);margin-bottom:14px;font-size:20px;
}
.feature-card h3{font-size:16px;}
.feature-card p{font-size:14px;margin:0;}

/* ===== Grid (the core when2meet-style picker) ===== */
.grid-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:12px;background:#fff;}
.avail-grid{border-collapse:collapse;user-select:none;}
.avail-grid th{
  position:sticky;top:0;background:#fafbff;z-index:5;
  padding:10px 6px;font-size:12px;color:var(--text-dim);font-weight:600;
  border-bottom:1px solid var(--border);white-space:nowrap;text-align:center;
}
.avail-grid td.time-label{
  font-size:11px;color:var(--text-faint);padding:0 10px;white-space:nowrap;
  border-right:1px solid var(--border);text-align:right;position:sticky;left:0;background:#fff;z-index:3;
}
.avail-grid td.slot{
  width:26px;height:14px;border:1px solid #eef0f7;cursor:pointer;
  background:#f6f7fb;transition:background .08s;
}
.avail-grid td.slot:hover{background:#e9ebf7;}
.avail-grid td.slot.selected{background:var(--success);border-color:#11a06d;}
.avail-grid td.slot.heat-1{background:#e3dcff;}
.avail-grid td.slot.heat-2{background:#c7b8ff;}
.avail-grid td.slot.heat-3{background:#a385ff;}
.avail-grid td.slot.heat-4{background:#8761ff;}
.avail-grid td.slot.heat-best{background:var(--accent-2);box-shadow:0 0 0 1px var(--accent-2) inset;}
.avail-grid td.hour-line{border-top:1px solid #dde1ee;}

.legend{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--text-dim);margin-top:14px;}
.legend .swatch{width:14px;height:14px;border-radius:3px;display:inline-block;border:1px solid var(--border);}

/* ===== Tables (admin) ===== */
table.data-table{width:100%;border-collapse:collapse;font-size:14px;}
table.data-table th{
  text-align:left;padding:12px 14px;color:var(--text-dim);font-weight:600;
  border-bottom:1px solid var(--border);font-size:12.5px;text-transform:uppercase;letter-spacing:.04em;
}
table.data-table td{padding:14px;border-bottom:1px solid #eef0f7;}
table.data-table tr:hover td{background:#fafbff;}

.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:28px;}
.stat-card{padding:22px;}
.stat-card .num{font-size:30px;font-weight:800;margin-bottom:2px;color:var(--text);}
.stat-card .label{font-size:13px;color:var(--text-faint);}

/* ===== Misc ===== */
.flex{display:flex;}
.flex-between{display:flex;align-items:center;justify-content:space-between;}
.gap-8{gap:8px;}.gap-12{gap:12px;}.gap-16{gap:16px;}
.mt-8{margin-top:8px;}.mt-16{margin-top:16px;}.mt-24{margin-top:24px;}.mt-32{margin-top:32px;}
.mb-0{margin-bottom:0;}
.text-dim{color:var(--text-dim);}
.text-center{text-align:center;}
.divider{height:1px;background:var(--border);margin:24px 0;}

.copy-box{
  display:flex;align-items:center;gap:10px;
  background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px 14px;
  font-size:13.5px;color:var(--text-dim);
}
.copy-box code{color:#0d9486;font-family:'SF Mono',Consolas,monospace;}

.alert{padding:14px 16px;border-radius:10px;font-size:14px;margin-bottom:20px;}
.alert-success{background:rgba(22,184,127,.08);border:1px solid rgba(22,184,127,.25);color:#0d9163;}
.alert-error{background:rgba(230,59,98,.08);border:1px solid rgba(230,59,98,.25);color:var(--danger);}

.footer{padding:50px 0;text-align:center;color:var(--text-faint);font-size:13px;border-top:1px solid var(--border);margin-top:80px;}

@media(max-width:760px){
  .features{grid-template-columns:1fr;}
  .field-row{grid-template-columns:1fr;}
  .stat-grid{grid-template-columns:repeat(2,1fr);}
  .hero h1{font-size:32px;}
}