:root {
  --bg: #222222;
  --bg-2: #2b2b2b;
  --glass: rgba(255, 255, 255, 0.055);
  --glass-strong: rgba(255, 255, 255, 0.085);
  --glass-soft: rgba(255, 255, 255, 0.035);
  --line: rgba(255, 255, 255, 0.10);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: rgba(255, 255, 255, 0.97);
  --text-2: rgba(255, 255, 255, 0.68);
  --text-3: rgba(255, 255, 255, 0.42);
  --shadow: 0 1.4rem 3.8rem rgba(0, 0, 0, 0.28);
  --radius-xl: clamp(1.2rem, 2vw, 1.8rem);
  --radius-lg: clamp(1rem, 1.5vw, 1.4rem);
  --radius-md: clamp(.8rem, 1vw, 1rem);
  --gap: clamp(.9rem, 1.5vw, 1.35rem);
  --pad: clamp(1rem, 2vw, 1.6rem);
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  font-family: "DM Sans", Inter, system-ui, sans-serif;
  background:
    radial-gradient(circle at 12% -5%, rgba(255,255,255,.055), transparent 30%),
    radial-gradient(circle at 100% 10%, rgba(255,255,255,.025), transparent 26%),
    linear-gradient(145deg, var(--bg), var(--bg-2));
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.012) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.012) 1px, transparent 1px);
  background-size: 2.6rem 2.6rem;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.35), transparent 72%);
}

.ambient {
  position: fixed;
  border-radius: 50%;
  filter: blur(7rem);
  opacity: .22;
  pointer-events: none;
}

.ambient-one { width: 22rem; height: 22rem; left: -8rem; top: 18%; background: #fff; }
.ambient-two { width: 18rem; height: 18rem; right: -6rem; bottom: 6%; background: #777; }

button, input, textarea { font: inherit; }

button { cursor: pointer; }

svg {
  width: 1.15em;
  height: 1.15em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.app-shell {
  width: min(96vw, 92rem);
  margin: 0 auto;
  padding: clamp(1rem, 2vw, 2rem) 0 clamp(2rem, 5vw, 4rem);
}

.glass {
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.035));
  border: 1px solid var(--line);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,.055);
  backdrop-filter: blur(1.2rem) saturate(115%);
  -webkit-backdrop-filter: blur(1.2rem) saturate(115%);
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: clamp(1.2rem, 2.4vw, 2rem);
  border-radius: var(--radius-xl);
  margin-bottom: var(--gap);
}

.hero-copy { max-width: 48rem; }

.hero h1 {
  margin: .35rem 0 .55rem;
  font-size: clamp(2rem, 4.8vw, 4.2rem);
  line-height: .96;
  letter-spacing: -.055em;
  font-weight: 800;
}

.hero p {
  max-width: 42rem;
  margin: 0;
  color: var(--text-2);
  font-size: clamp(.95rem, 1.5vw, 1.08rem);
  line-height: 1.6;
}

.kicker {
  display: inline-block;
  color: var(--text-3);
  font-size: clamp(.68rem, 1vw, .78rem);
  font-weight: 800;
  letter-spacing: .13em;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: .65rem;
  flex-shrink: 0;
}

.date-chip,
.pill {
  display: inline-flex;
  align-items: center;
  min-height: 2.35rem;
  padding: .6rem .9rem;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  border-radius: 999px;
  color: var(--text-2);
  white-space: nowrap;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.65rem;
  height: 2.65rem;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.05);
  color: var(--text);
  border-radius: 50%;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}

.icon-button.small {
  width: 2.25rem;
  height: 2.25rem;
}

.icon-button:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,.09);
  border-color: var(--line-strong);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
  margin-bottom: var(--gap);
}

.stat {
  display: flex;
  align-items: center;
  gap: .95rem;
  min-height: clamp(6.8rem, 10vw, 8.2rem);
  padding: var(--pad);
  border-radius: var(--radius-lg);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.stat:hover,
.panel:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(255,255,255,.082), rgba(255,255,255,.045));
}

.stat-icon,
.empty-icon {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: clamp(2.7rem, 4vw, 3.25rem);
  height: clamp(2.7rem, 4vw, 3.25rem);
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.055);
  color: rgba(255,255,255,.82);
}

.stat span {
  display: block;
  margin-bottom: .35rem;
  color: var(--text-3);
  font-size: clamp(.76rem, 1vw, .88rem);
}

.stat strong {
  font-size: clamp(1.55rem, 2.4vw, 2.15rem);
  line-height: 1;
  letter-spacing: -.04em;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: var(--gap);
  margin-bottom: var(--gap);
}

.panel {
  padding: var(--pad);
  border-radius: var(--radius-xl);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: .9rem;
  margin-bottom: 1rem;
}

.section-heading h2 {
  margin: .18rem 0 0;
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  letter-spacing: -.035em;
}

.pill {
  min-height: 2rem;
  padding: .42rem .72rem;
  font-size: .78rem;
}

.today-list,
.history-list {
  display: grid;
  gap: .65rem;
}

.today-class,
.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .8rem;
  padding: clamp(.8rem, 1.3vw, 1rem);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.07);
  border-radius: var(--radius-md);
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
}

.today-class:hover,
.history-item:hover {
  transform: translateY(-1px);
  background: rgba(255,255,255,.065);
  border-color: rgba(255,255,255,.13);
}

.today-main {
  display: grid;
  grid-template-columns: minmax(7.2rem, .8fr) minmax(8rem, 1.25fr) minmax(4rem, .5fr);
  align-items: center;
  gap: .75rem;
  flex: 1;
}

.today-time {
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
  font-size: .9rem;
}

.today-subject { font-weight: 700; }

.today-room {
  color: var(--text-3);
  font-size: .82rem;
}

.btn {
  border-radius: 999px;
  padding: .68rem 1rem;
  border: 1px solid var(--line);
  transition: transform .16s ease, background .16s ease, border-color .16s ease, color .16s ease;
  font-weight: 700;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}

.btn.primary {
  background: rgba(255,255,255,.92);
  color: #1f1f1f;
}

.btn.primary:hover { background: #fff; }

.btn.ghost {
  background: rgba(255,255,255,.04);
  color: var(--text-2);
}

.btn.absence {
  padding-inline: .95rem;
  background: rgba(255,255,255,.035);
  color: var(--text-2);
}

.btn.absence.registered {
  background: rgba(255,255,255,.11);
  color: var(--text);
  border-color: var(--line-strong);
}

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 40rem;
}

th, td {
  padding: .78rem .7rem;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,.07);
}

th {
  color: var(--text-3);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
}

td {
  color: var(--text-2);
  font-size: .9rem;
}

td strong { color: var(--text); }

.subject-code {
  margin-top: .15rem;
  color: var(--text-3);
  font-size: .72rem;
}

.progress {
  width: clamp(5.5rem, 7vw, 8rem);
  height: .38rem;
  margin-top: .4rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
}

.progress > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: rgba(255,255,255,.72);
  transition: width .25s ease;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .42rem .68rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-2);
  background: rgba(255,255,255,.035);
  font-size: .74rem;
  font-weight: 700;
}

.status::before {
  content: "";
  width: .42rem;
  height: .42rem;
  border-radius: 50%;
  background: currentColor;
  opacity: .72;
}

.status.warning { color: rgba(255,255,255,.82); }
.status.danger { color: #fff; border-color: rgba(255,255,255,.24); background: rgba(255,255,255,.08); }

.history-panel { margin-bottom: var(--gap); }

.history-item {
  align-items: flex-start;
}

.history-main {
  display: grid;
  grid-template-columns: minmax(6rem,.8fr) minmax(8rem,1fr) .45fr minmax(7rem,.8fr) minmax(8rem,1.2fr);
  gap: .75rem;
  flex: 1;
  align-items: center;
}

.history-main small,
.history-main span {
  color: var(--text-3);
  font-size: .78rem;
}

.history-main strong { font-size: .92rem; }

.history-actions {
  display: flex;
  gap: .45rem;
}

.action-circle {
  display: grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  color: var(--text-2);
  background: rgba(255,255,255,.04);
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
}

.action-circle:hover {
  transform: translateY(-1px);
  background: rgba(255,255,255,.09);
  border-color: var(--line-strong);
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 11rem;
  text-align: center;
  color: var(--text-3);
}

.empty-state p { margin: .7rem 0 0; }

.hidden { display: none !important; }

dialog {
  width: min(92vw, 34rem);
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xl);
  background: rgba(35,35,35,.92);
  color: var(--text);
  box-shadow: 0 2rem 6rem rgba(0,0,0,.5);
  backdrop-filter: blur(1.5rem);
}

dialog::backdrop {
  background: rgba(15,15,15,.68);
  backdrop-filter: blur(.4rem);
}

.dialog-card {
  display: grid;
  gap: 1rem;
  padding: clamp(1.15rem, 2.5vw, 1.7rem);
}

.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: .9rem;
}

.dialog-head h3 {
  margin: .25rem 0 0;
  font-size: 1.55rem;
  letter-spacing: -.035em;
}

.dialog-session {
  margin: .3rem 0 0;
  color: var(--text-3);
  font-size: .84rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .8rem;
}

label {
  display: grid;
  gap: .45rem;
  color: var(--text-2);
  font-size: .84rem;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  outline: none;
  border-radius: .9rem;
  padding: .82rem .9rem;
  background: rgba(255,255,255,.045);
  color: var(--text);
  resize: vertical;
  transition: border-color .16s ease, background .16s ease;
}

input:focus,
textarea:focus {
  border-color: var(--line-strong);
  background: rgba(255,255,255,.065);
}

.switch-row {
  position: relative;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: .85rem .95rem;
  background: rgba(255,255,255,.035);
  border: 1px solid var(--line);
  border-radius: .95rem;
}

.switch-row strong { display: block; color: var(--text); }
.switch-row small { display: block; margin-top: .15rem; color: var(--text-3); font-weight: 500; }

.switch-row input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.switch-row i {
  position: relative;
  width: 2.8rem;
  height: 1.55rem;
  border-radius: 999px;
  background: rgba(255,255,255,.11);
  border: 1px solid var(--line);
  transition: background .16s ease;
}

.switch-row i::after {
  content: "";
  position: absolute;
  width: 1.08rem;
  height: 1.08rem;
  top: .18rem;
  left: .18rem;
  border-radius: 50%;
  background: rgba(255,255,255,.72);
  transition: transform .18s ease, background .18s ease;
}

.switch-row input:checked + i {
  background: rgba(255,255,255,.23);
}

.switch-row input:checked + i::after {
  transform: translateX(1.22rem);
  background: #fff;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: .65rem;
  margin-top: .3rem;
}

.toast {
  position: fixed;
  right: clamp(.8rem, 2vw, 1.5rem);
  bottom: clamp(.8rem, 2vw, 1.5rem);
  max-width: min(90vw, 24rem);
  padding: .82rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(38,38,38,.9);
  color: var(--text);
  box-shadow: var(--shadow);
  backdrop-filter: blur(1rem);
  font-size: .86rem;
  z-index: 50;
}

@media (max-width: 68rem) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-grid { grid-template-columns: 1fr; }
}

@media (max-width: 46rem) {
  .hero { align-items: flex-start; flex-direction: column; }
  .hero-actions { width: 100%; justify-content: space-between; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .today-main { grid-template-columns: 1fr 1fr; }
  .today-room { display: none; }
  .history-main { grid-template-columns: 1fr 1fr; }
  .history-main > :nth-child(n+3) { margin-top: .15rem; }
}

@media (max-width: 34rem) {
  .app-shell { width: min(94vw, 92rem); }
  .stats-grid { grid-template-columns: 1fr; }
  .section-heading { align-items: flex-start; }
  .date-chip { font-size: .78rem; }
  .today-class,
  .history-item { align-items: stretch; flex-direction: column; }
  .today-main { grid-template-columns: 1fr auto; }
  .today-class .btn { width: 100%; }
  .form-grid { grid-template-columns: 1fr; }
  .dialog-actions { flex-direction: column-reverse; }
  .dialog-actions .btn { width: 100%; }
  .history-actions { width: 100%; }
  .history-actions .action-circle { flex: 1; border-radius: 999px; }
}