/* Titles: Baskervville (bundled in /fonts, SIL Open Font License). Everything else: Consolas, with the closest
   monospace fonts as fallbacks on systems that do not have it (Consolas ships with Windows and Office only). */
@font-face {
  font-family: "Baskervville";
  src: url("/fonts/Baskervville-Variable.ttf") format("truetype");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ==========================================
   THEME VARIABLES (Dark Mode Default)
   ========================================== */
:root {
  --grid-size: 2rem;
  --grid-line: rgba(22, 110, 172, 0.22);
  --bg: #0d0d0f;
  --surface: #16161a;
  --surface2: #1c1c22;
  --border: #2a2a32;
  --accent: #166eac;
  --accent2: #00ddff;
  --text: #e8e8f0;
  --muted: #a0a0b8;
  --ok: #4ade80;
  --warn: #fbbf24;
  --danger: #ff5f5f;
  --orange: #ff8c32;
  --radius: 0.625rem;
  
  /* Dark mode background meshes */
  --mesh-1: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='700' height='700' viewBox='0 0 700 700'%3E%3Cg stroke='%23166eac' stroke-width='0.8' stroke-opacity='0.15' fill='none'%3E%3Cpolygon points='0,0 150,60 50,180' /%3E%3Cpolygon points='150,60 320,30 230,150' /%3E%3Cpolygon points='320,30 500,70 410,170' /%3E%3Cpolygon points='500,70 700,20 620,160' /%3E%3Cpolygon points='50,180 150,60 230,150 190,310 70,280' /%3E%3Cpolygon points='230,150 410,170 350,320 190,310' /%3E%3Cpolygon points='410,170 620,160 530,330 350,320' /%3E%3Cpolygon points='70,280 190,310 120,460 0,420' /%3E%3Cpolygon points='190,310 350,320 280,480 120,460' /%3E%3Cpolygon points='350,320 530,330 450,490 280,480' /%3E%3Cpolygon points='530,330 700,160 700,450 450,490' /%3E%3Cpolygon points='0,420 120,460 60,620 0,580' /%3E%3Cpolygon points='120,460 280,480 200,640 60,620' /%3E%3Cpolygon points='280,480 450,490 360,650 200,640' /%3E%3Cpolygon points='450,490 700,450 600,670 360,650' /%3E%3Cpolygon points='60,620 200,640 100,700 0,700' /%3E%3Cpolygon points='200,640 360,650 240,700 100,700' /%3E%3Cpolygon points='360,650 600,670 500,700 240,700' /%3E%3C/g%3E%3C/svg%3E");
  --mesh-2: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='600' height='600' viewBox='0 0 600 600'%3E%3Cg stroke='%2300ddff' stroke-width='0.6' stroke-opacity='0.08' fill='none'%3E%3Cpolygon points='0,0 120,80 60,190' /%3E%3Cpolygon points='120,80 270,40 190,170' /%3E%3Cpolygon points='270,40 440,90 350,210' /%3E%3Cpolygon points='440,90 600,30 540,190' /%3E%3Cpolygon points='60,190 120,80 190,170 150,330 60,310' /%3E%3Cpolygon points='190,170 350,210 280,350 150,330' /%3E%3Cpolygon points='350,210 540,190 470,360 280,350' /%3E%3Cpolygon points='60,310 150,330 90,490 0,450' /%3E%3Cpolygon points='150,330 280,350 220,500 90,490' /%3E%3Cpolygon points='280,350 470,360 390,510 220,500' /%3E%3Cpolygon points='470,360 540,190 600,370 390,510' /%3E%3Cpolygon points='0,450 90,490 40,600 0,600' /%3E%3Cpolygon points='90,490 220,500 160,600 40,600' /%3E%3Cpolygon points='220,500 390,510 300,600 160,600' /%3E%3Cpolygon points='390,510 600,370 600,600 300,600' /%3E%3C/g%3E%3C/svg%3E");

  --font-title:
    "Baskervville", Baskerville, "Libre Baskerville", Georgia,
    "Times New Roman", serif;
  --font:
    Consolas, "Cascadia Mono", "SFMono-Regular", Menlo, "DejaVu Sans Mono",
    "Liberation Mono", monospace;
  --mono: var(--font);
}

/* ==========================================
   LIGHT THEME OVERRIDES
   ========================================== */
[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f4f7;
  --surface: #ffffff;
  --surface2: #eaeaf0;
  --border: #d0d0d8;
  --accent: #166eac;
  --accent2: #007799;
  --text: #1a1a24;
  --muted: #62627a;
  --ok: #16803c;
  --warn: #b45309;
  --danger: #dc2626;
  --orange: #c25e00;

  /* Light mode background meshes */
  --mesh-1: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='700' height='700' viewBox='0 0 700 700'%3E%3Cg stroke='%23166eac' stroke-width='0.8' stroke-opacity='0.20' fill='none'%3E%3Cpolygon points='0,0 150,60 50,180' /%3E%3Cpolygon points='150,60 320,30 230,150' /%3E%3Cpolygon points='320,30 500,70 410,170' /%3E%3Cpolygon points='500,70 700,20 620,160' /%3E%3Cpolygon points='50,180 150,60 230,150 190,310 70,280' /%3E%3Cpolygon points='230,150 410,170 350,320 190,310' /%3E%3Cpolygon points='410,170 620,160 530,330 350,320' /%3E%3Cpolygon points='70,280 190,310 120,460 0,420' /%3E%3Cpolygon points='190,310 350,320 280,480 120,460' /%3E%3Cpolygon points='350,320 530,330 450,490 280,480' /%3E%3Cpolygon points='530,330 700,160 700,450 450,490' /%3E%3Cpolygon points='0,420 120,460 60,620 0,580' /%3E%3Cpolygon points='120,460 280,480 200,640 60,620' /%3E%3Cpolygon points='280,480 450,490 360,650 200,640' /%3E%3Cpolygon points='450,490 700,450 600,670 360,650' /%3E%3Cpolygon points='60,620 200,640 100,700 0,700' /%3E%3Cpolygon points='200,640 360,650 240,700 100,700' /%3E%3Cpolygon points='360,650 600,670 500,700 240,700' /%3E%3C/g%3E%3C/svg%3E");
  --mesh-2: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='600' height='600' viewBox='0 0 600 600'%3E%3Cg stroke='%23007799' stroke-width='0.6' stroke-opacity='0.12' fill='none'%3E%3Cpolygon points='0,0 120,80 60,190' /%3E%3Cpolygon points='120,80 270,40 190,170' /%3E%3Cpolygon points='270,40 440,90 350,210' /%3E%3Cpolygon points='440,90 600,30 540,190' /%3E%3Cpolygon points='60,190 120,80 190,170 150,330 60,310' /%3E%3Cpolygon points='190,170 350,210 280,350 150,330' /%3E%3Cpolygon points='350,210 540,190 470,360 280,350' /%3E%3Cpolygon points='60,310 150,330 90,490 0,450' /%3E%3Cpolygon points='150,330 280,350 220,500 90,490' /%3E%3Cpolygon points='280,350 470,360 390,510 220,500' /%3E%3Cpolygon points='470,360 540,190 600,370 390,510' /%3E%3Cpolygon points='0,450 90,490 40,600 0,600' /%3E%3Cpolygon points='90,490 220,500 160,600 40,600' /%3E%3Cpolygon points='220,500 390,510 300,600 160,600' /%3E%3Cpolygon points='390,510 600,370 600,600 300,600' /%3E%3C/g%3E%3C/svg%3E");
}

/* Everything is sized in rem, so this one line makes the whole interface 25% larger (16px -> 20px). */
html {
  color-scheme: dark;
  font-size: 125%;
}
body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--text);
  font: 0.9375rem/1.5 var(--font);
  position: relative;
}

/* Animated multi-layered background with variable-driven meshes and column fadeout */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: var(--mesh-1), var(--mesh-2);
  background-size: 700px 700px, 600px 600px;
  background-position: 0 0, 300px 220px;
  background-repeat: repeat, repeat;
  
  animation: meshDrift 60s linear infinite;
  
  mask-image: linear-gradient(to right, black 0%, rgba(0,0,0,0.2) 15%, transparent 30%, transparent 70%, rgba(0,0,0,0.2) 85%, black 100%);
  -webkit-mask-image: linear-gradient(to right, black 0%, rgba(0,0,0,0.2) 15%, transparent 30%, transparent 70%, rgba(0,0,0,0.2) 85%, black 100%);
  
  pointer-events: none;
  z-index: 0;
}

@keyframes meshDrift {
  0% {
    background-position: 0 0, 300px 220px;
  }
  100% {
    background-position: 700px 700px, -300px 820px;
  }
}

a {
  color: var(--accent2);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
h1,
h2,
.topbar .brand {
  font-family: var(--font-title);
}
h1 {
  font-size: 1.85rem;
  margin: 0 0 0.2rem;
  font-weight: 700;
  line-height: 1.2;
}
h2 {
  font-size: 1.25rem;
  margin: 0 0 0.8rem;
  font-weight: 600;
  line-height: 1.25;
}
code,
.mono {
  font-family: var(--mono);
  font-size: 0.85em;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 0.85rem;
}
[hidden] {
  display: none !important;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 1.2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  opacity: 0.95;
}
.topbar .brand {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  color: var(--text);
}
.topbar .spacer {
  flex: 1;
}
.wrap {
  max-width: 68.75rem;
  margin: 0 auto;
  padding: 1.5rem 1.2rem 3rem;
  min-height: calc(100vh - 3.4rem);
}
.cols {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}
@media (max-width: 1075px) {
  .cols {
    grid-template-columns: 1fr;
  }
}
.head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  margin-bottom: 1rem;
}
.card.narrow {
  max-width: 26rem;
  margin: 6vh auto 0;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1rem;
  border: 0;
  border-radius: 0.5rem;
  background: var(--accent);
  color: #fff;
  font: 700 0.9rem var(--font);
  cursor: pointer;
  text-decoration: none;
}
.btn:hover {
  filter: brightness(1.12);
  text-decoration: none;
}
.btn:disabled,
.btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  filter: none;
}
.btn.secondary {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
}
.btn.small {
  padding: 0.3rem 0.65rem;
  font-size: 0.8rem;
}
.btn.block {
  display: block;
  width: 100%;
}

label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.8rem 0 0.25rem;
}
input[type="text"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.7rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font: inherit;
}
input:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  border-color: transparent;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  font: 500 0.72rem var(--mono);
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--muted);
}
.badge.student {
  color: var(--accent2);
  border-color: rgba(0, 221, 255, 0.35);
}
.badge.evaluation {
  color: var(--warn);
  border-color: rgba(251, 191, 36, 0.35);
}
.badge.admin {
  color: #c4b5fd;
  border-color: rgba(196, 181, 253, 0.4);
}
.badge.manager {
  color: var(--ok);
  border-color: rgba(74, 222, 128, 0.4);
}
.badge.active {
  color: var(--ok);
  border-color: rgba(74, 222, 128, 0.4);
}
.badge.before {
  color: var(--warn);
}
.badge.after {
  color: var(--danger);
}

.banner {
  padding: 0.65rem 0.9rem;
  border-radius: 0.5rem;
  margin-bottom: 0.8rem;
  border: 1px solid var(--border);
  background: var(--surface2);
  font-size: 0.9rem;
}
.banner.ok {
  border-color: rgba(74, 222, 128, 0.45);
}
.banner.warn {
  border-color: rgba(251, 191, 36, 0.5);
}
.banner.error {
  border-color: rgba(255, 95, 95, 0.55);
  color: #ffb4b4;
}
.banner .big {
  font: 500 1.15rem var(--mono);
  display: block;
  margin-top: 0.2rem;
}
.err {
  color: #ffb4b4;
  font-size: 0.85rem;
  min-height: 1.2rem;
  margin-top: 0.6rem;
}

.tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}
.tab {
  flex: 1;
  padding: 0.5rem;
  text-align: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--muted);
  cursor: pointer;
  font: 700 0.85rem var(--font);
}
.tab.on {
  color: var(--text);
  border-color: var(--accent);
}

.exam-list {
  display: grid;
  gap: 0.8rem;
}
.exam-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.exam-row h2 {
  margin: 0 0 0.2rem;
}

.drop {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s;
}
.drop.over {
  border-color: var(--accent2);
  color: var(--text);
}
.drop.locked {
  opacity: 0.45;
  cursor: not-allowed;
}
.files {
  list-style: none;
  padding: 0;
  margin: 0.8rem 0;
  display: grid;
  gap: 0.45rem;
}
.file {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.2rem 0.8rem;
  align-items: center;
  padding: 0.5rem 0.7rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}
.file .name {
  overflow-wrap: anywhere;
}
.file .status {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  color: var(--muted);
}
.file.bad {
  border-color: rgba(255, 95, 95, 0.5);
}
.file.bad .status {
  color: #ffb4b4;
}
.file.done {
  border-color: rgba(74, 222, 128, 0.45);
}
.file.done .status {
  color: var(--ok);
}
.bar {
  grid-column: 1 / -1;
  height: 0.3125rem;
  background: var(--bg);
  border-radius: 0.1875rem;
  overflow: hidden;
}
.bar > i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent2);
  transition: width 0.1s;
}
.rule {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0.2rem 0;
}
.rule code {
  color: var(--text);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
th {
  text-align: left;
  font-weight: 700;
  color: var(--muted);
  padding: 0.35rem 0.5rem;
  border-bottom: 1px solid var(--border);
}
td {
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--border);
  overflow-wrap: anywhere;
}

.chat {
  display: flex;
  flex-direction: column;
  height: 26rem;
}
.chat-log {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.2rem;
  margin-bottom: 0.6rem;
}
.msg {
  max-width: 85%;
  padding: 0.45rem 0.7rem;
  border-radius: 0.625rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}
.msg.me {
  align-self: flex-end;
  background: rgba(22, 110, 172, 0.25);
  border-color: rgba(22, 110, 172, 0.5);
}
.msg .who {
  display: block;
  font: 500 0.68rem var(--mono);
  color: var(--muted);
  margin-bottom: 0.1rem;
}
.chat-form {
  display: flex;
  gap: 0.5rem;
}
.chat-form textarea {
  resize: none;
  height: 2.8rem;
}

.msg.admin {
  border-color: rgba(255, 140, 50, 0.6);
}
.msg .who.admin {
  color: var(--orange);
}
.msg .who.admin .who-name {
  font-weight: 700;
}
.admin-tag {
  display: inline-block;
  margin-left: 0.3rem;
  padding: 0.02rem 0.5rem;
  border-radius: 999px;
  background: var(--orange);
  color: #1a0e04;
  font: 700 0.68rem var(--mono);
  vertical-align: baseline;
}

select {
  appearance: auto;
}
.btn.danger {
  background: #8f2d2d;
}
.btn.danger:disabled {
  background: #8f2d2d;
}
.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1rem;
}
@media (max-width: 800px) {
  .grid2 {
    grid-template-columns: 1fr;
  }
}
.help {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.2rem;
}
.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.8rem 0 0.2rem;
  color: var(--text);
  font-size: 0.9rem;
}
.check input {
  width: auto;
}
.actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.ok-text {
  color: var(--ok);
  font-size: 0.85rem;
}
.inline {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}
.inline > input[type="text"] {
  flex: 1;
  min-width: 10rem;
}
.pill-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
}
.danger-zone {
  border-color: rgba(255, 95, 95, 0.35);
}
td.num,
th.num {
  text-align: right;
}
td .btn {
  white-space: nowrap;
}

.alias-card {
  text-align: center;
  max-width: 30rem;
  margin: 0 auto 1.2rem;
  padding: 0.9rem 1.5rem 1rem;
  border: 2px solid var(--accent2);
  border-radius: var(--radius);
  background: rgba(0, 221, 255, 0.08);
  box-shadow: 0 0 1.5rem rgba(0, 221, 255, 0.2);
}
.alias-label {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.alias-code {
  font: 700 3rem/1.15 var(--mono);
  letter-spacing: 0.3em;
  padding-left: 0.3em;
  color: var(--accent2);
  user-select: all;
}

.inbox {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}
@media (max-width: 950px) {
  .inbox {
    grid-template-columns: 1fr;
  }
}
.thread {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.55rem 0.7rem;
  margin-bottom: 0.4rem;
  background: var(--accent);
  border: 2px solid transparent;
  border-radius: 0.5rem;
  color: #fff;
  cursor: pointer;
  font: inherit;
}
.thread:hover {
  filter: brightness(1.12);
}
.thread.on {
  border-color: var(--accent2);
}
.thread .top {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: center;
}
.thread .snip {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 0.15rem;
}
.dot {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #fff;
}
.group-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.group-head strong {
  font-family: var(--mono);
  letter-spacing: 0.04em;
}
.group-head .spacer {
  flex: 1;
}
.group-body {
  margin-top: 0.7rem;
}
.card.group {
  padding: 0.8rem 1rem;
  margin-bottom: 0.7rem;
}
.summary {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
}

body.review main .btn,
body.review main .btn.secondary {
  background: var(--accent);
  border: 0;
  color: #fff;
}
body.review main .btn:disabled {
  opacity: 0.4;
}

.grade-input {
  width: 6rem;
}
.grade-status {
  min-width: 9rem;
}
.grade-summary {
  font-weight: 700;
  margin: 0 0 0.8rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

.topbar, .wrap {
  position: relative;
  z-index: 1;
}

/* Sliding Theme Toggle Switch */
.theme-switch {
  position: relative;
  width: 3.4rem;
  height: 1.8rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  transition: background-color 0.2s, border-color 0.2s;
}
.theme-switch:hover {
  border-color: var(--accent);
}
.theme-switch .thumb {
  position: absolute;
  top: 0.15rem;
  left: 0.15rem;
  width: 1.35rem;
  height: 1.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 5px rgba(0,0,0,0.15);
  z-index: 2;
}

/* Background track icons */
.theme-switch .track-icons {
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 0.35rem;
  font-size: 0.75rem;
  user-select: none;
}

/* Default (Dark Mode): Moon is active (bright), Sun is inactive (grayscale + transparent) */
.theme-switch .track-icons span:nth-child(1) {
  opacity: 1;
  filter: none;
}
.theme-switch .track-icons span:nth-child(2) {
  opacity: 0.3;
  filter: grayscale(100%);
}

/* Light Mode: Sun is active (bright), Moon is inactive (grayscale + transparent) */
html[data-theme="light"] .theme-switch .thumb {
  transform: translateX(1.6rem);
}
html[data-theme="light"] .theme-switch .track-icons span:nth-child(1) {
  opacity: 0.3;
  filter: grayscale(100%);
}
html[data-theme="light"] .theme-switch .track-icons span:nth-child(2) {
  opacity: 1;
  filter: none;
}