:root{
  --primary:#243f56;
  --primary-2:#1f3447;
  --bg:#f6f8fb;
  --card:#ffffff;
  --text:#14202a;
  --muted:#5b6b78;
  --border:#dde5ec;
  --shadow: 0 14px 35px rgba(0,0,0,.10);
  --ring: 0 0 0 4px rgba(36,63,86,.18);
  --radius: 18px;
}

body.dark{
  --bg:#0c141c;
  --card:#111f2c;
  --text:#eaf1f7;
  --muted:#b4c5d5;
  --border:#233546;
  --shadow: 0 18px 45px rgba(0,0,0,.45);
  --ring: 0 0 0 4px rgba(0,188,212,.18);
}

*{ box-sizing:border-box; }
html, body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: .25s ease;
}

/* Header */
.app-header{
  position: sticky;
  top:0;
  z-index: 10;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%);
  padding: 10px 12px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  border-bottom: 1px solid rgba(255,255,255,.10);
}

.brand img{
  height: 38px;
  max-width: 64vw;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,.15));
}

.actions{
  display:flex;
  align-items:center;
  gap:10px;
}

.icon-btn{
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.10);
  color:#fff;
  border-radius: 14px;
  padding: 10px 12px;
  font-size: 16px;
  cursor:pointer;
}
.icon-btn:active{ transform: scale(.99); }
.icon-btn.dark{
  color: var(--text);
  border: 1px solid var(--border);
  background: rgba(36,63,86,.10);
}

/* Toggle */
.theme-toggle{
  display:flex;
  align-items:center;
  gap:6px;
  color:#fff;
}
.theme-ico{ font-size: 14px; opacity:.9; }

.switch{
  position:relative;
  width:54px;
  height:28px;
  display:inline-block;
}
.switch input{ display:none; }
.slider{
  position:absolute;
  inset:0;
  background: rgba(255,255,255,.25);
  border-radius: 999px;
  cursor:pointer;
  transition:.2s;
}
.slider:before{
  content:"";
  position:absolute;
  width:22px;
  height:22px;
  left:3px;
  top:3px;
  background:#fff;
  border-radius:50%;
  transition:.2s;
}
.switch input:checked + .slider{
  background: rgba(0,188,212,.9);
}
.switch input:checked + .slider:before{
  transform: translateX(26px);
}

/* Layout */
.container{
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 12px 26px;
}

.hero{ margin-top: 8px; }
.hero-card{
  background: radial-gradient(1200px 260px at 10% 10%, rgba(36,63,86,.18) 0%, transparent 60%),
              radial-gradient(900px 240px at 90% 0%, rgba(0,188,212,.14) 0%, transparent 55%),
              var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 14px;
}
.hero-title h1{
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: -.2px;
}
.hero-title p{
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}
.hero-badges{
  display:flex;
  flex-wrap: wrap;
  gap:8px;
  margin-top: 12px;
}
.badge{
  font-size: 12px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(36,63,86,.06);
  color: var(--text);
}

/* Card */
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

/* Form */
.form{
  display:flex;
  flex-direction:column;
  gap: 12px;
}

.field label{
  display:block;
  font-weight: 800;
  font-size: 14px;
  margin-bottom: 6px;
}

.field input,
.field select,
.field textarea{
  width:100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.02);
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: .15s ease;
}

body.dark .field input,
body.dark .field select,
body.dark .field textarea{
  background: rgba(0,0,0,.10);
}

.field input:focus,
.field select:focus,
.field textarea:focus{
  box-shadow: var(--ring);
  border-color: rgba(0,188,212,.55);
}

.field textarea{ resize: vertical; }

.hint{
  display:block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
}

.actions-row{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-top: 4px;
}

.btn{
  border:0;
  border-radius: 14px;
  padding: 14px 14px;
  font-size: 16px;
  font-weight: 900;
  cursor:pointer;
  transition: .15s ease;
}

.btn-primary{
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%);
  color:#fff;
  box-shadow: 0 10px 18px rgba(36,63,86,.18);
}

.btn-ghost{
  background: rgba(36,63,86,.08);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn:active{ transform: scale(.99); }

.form-msg{
  font-size: 14px;
  color: var(--muted);
}

/* Footer */
.app-footer{
  margin-top: 18px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-2) 100%);
  color:#fff;
  text-align:center;
  padding: 16px 10px;
  font-size: 13px;
}

/* Modal */
.modal{
  display:none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.58);
  padding: 14px;
  align-items: center;
  justify-content: center;
}

.modal-card{
  width: 100%;
  max-width: 540px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow:hidden;
}

.modal-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:10px;
  padding: 14px 14px;
  background: rgba(36,63,86,.08);
}

.modal-head h2{ margin: 0; font-size: 16px; }
.modal-sub{
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.modal-body{
  padding: 14px;
  display:flex;
  flex-direction:column;
  gap: 12px;
}

.modal-actions{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-top: 4px;
}

.note{
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35;
}

/* Desktop/tablet */
@media (min-width: 768px){
  .app-header{ padding: 12px 26px; }
  .brand img{ height: 44px; max-width: 420px; }
  .hero-card{ padding: 20px; }
  .card{ padding: 20px; }

  .form{
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px 16px;
  }
  .span-2{ grid-column: 1 / -1; }

  .actions-row{
    flex-direction: row;
    justify-content: space-between;
  }
  .actions-row .btn{ width: 100%; }
  .actions-row .btn:first-child{ max-width: 320px; }
  .actions-row .btn:last-child{ max-width: 360px; }

  .modal-actions{ flex-direction: row; }
}