:root {
  --ink: #1f2937;
  --muted: #667085;
  --line: #d9e2df;
  --paper: #fffdf8;
  --mint: #dff5e9;
  --sea: #3aa6a0;
  --coral: #f47d6d;
  --lemon: #f6c85f;
  --blue: #4f76d8;
  --lilac: #ded9ff;
  --good: #1f9d55;
  --warn: #b7791f;
  --bad: #c53030;
  --shadow: 0 18px 42px rgba(31, 41, 55, 0.12);
  --radius: 8px;
  --font: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font);
  background:
    linear-gradient(90deg, rgba(58, 166, 160, 0.12) 1px, transparent 1px),
    linear-gradient(180deg, rgba(244, 125, 109, 0.09) 1px, transparent 1px),
    #f4f8f4;
  background-size: 42px 42px;
}

button, input, textarea, select {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border: 2px solid var(--ink);
  border-radius: 12px;
  background: linear-gradient(135deg, var(--lemon), var(--coral));
  box-shadow: 4px 4px 0 var(--ink);
  flex: 0 0 auto;
}

h1 {
  margin: 0;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.1;
  letter-spacing: 0;
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 14px;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 253, 248, 0.9);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.nav-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.layout {
  display: grid;
  grid-template-columns: minmax(300px, 420px) minmax(0, 1fr);
  gap: 16px;
  align-items: stretch;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 253, 248, 0.96);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.card-title {
  margin: 0;
  font-size: 17px;
  line-height: 1.3;
}

.card-body {
  padding: 16px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.home-card {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  padding: 20px;
}

.home-card h2 {
  margin: 0 0 8px;
  font-size: 23px;
}

.home-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  border-radius: var(--radius);
  background: var(--ink);
  color: #ffffff;
  font-weight: 800;
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(31, 41, 55, 0.16);
}

.btn.secondary {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

.btn.primary {
  background: var(--sea);
}

.btn.warning {
  background: var(--coral);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
  box-shadow: none;
}

.student-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.privacy-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.login-form {
  display: grid;
  gap: 10px;
}

.login-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.student-number {
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
  color: var(--ink);
  font-weight: 900;
}

.student-number.active {
  border-color: var(--ink);
  background: var(--lemon);
  box-shadow: 3px 3px 0 var(--ink);
}

.student-number.done {
  border-color: rgba(31, 157, 85, 0.35);
  background: #eefbf3;
}

.buddy-stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 320px;
  padding: 24px 16px;
  background:
    radial-gradient(circle at 20% 18%, rgba(246, 200, 95, 0.24), transparent 28%),
    radial-gradient(circle at 86% 22%, rgba(79, 118, 216, 0.16), transparent 29%),
    linear-gradient(180deg, #f7fcfb, #fffdf8);
}

.buddy {
  position: relative;
  width: min(230px, 68vw);
  aspect-ratio: 1;
  transition: transform 220ms ease;
}

.buddy-body {
  position: absolute;
  inset: 18% 8% 4%;
  border: 3px solid var(--ink);
  border-radius: 42% 42% 38% 38%;
  background: var(--mint);
  box-shadow: 8px 8px 0 rgba(31, 41, 55, 0.12);
}

.buddy-head {
  position: absolute;
  left: 6%;
  right: 6%;
  top: 2%;
  height: 66%;
  border: 3px solid var(--ink);
  border-radius: 45% 45% 40% 40%;
  background: #ffffff;
  box-shadow: inset 0 -18px 0 rgba(223, 245, 233, 0.82);
}

.buddy-ear {
  position: absolute;
  top: 7%;
  width: 52px;
  height: 60px;
  border: 3px solid var(--ink);
  background: var(--lemon);
  border-radius: 12px 24px 20px 24px;
}

.buddy-ear.left {
  left: 9%;
  transform: rotate(-22deg);
}

.buddy-ear.right {
  right: 9%;
  transform: rotate(22deg) scaleX(-1);
}

.buddy-face {
  position: absolute;
  inset: 27% 22% auto;
  height: 82px;
}

.eye {
  position: absolute;
  top: 12px;
  width: 19px;
  height: 27px;
  border-radius: 99px;
  background: var(--ink);
}

.eye.left { left: 12px; }
.eye.right { right: 12px; }

.blush {
  position: absolute;
  top: 44px;
  width: 30px;
  height: 12px;
  border-radius: 99px;
  background: rgba(244, 125, 109, 0.22);
}

.blush.left { left: 0; }
.blush.right { right: 0; }

.mouth {
  position: absolute;
  left: 50%;
  bottom: 8px;
  width: 56px;
  height: 28px;
  border-bottom: 4px solid var(--ink);
  border-radius: 0 0 999px 999px;
  transform: translateX(-50%);
}

.buddy[data-mood="sad"] .mouth,
.buddy[data-mood="tired"] .mouth,
.buddy[data-mood="worried"] .mouth {
  height: 24px;
  border-bottom: 0;
  border-top: 4px solid var(--ink);
  border-radius: 999px 999px 0 0;
  bottom: 2px;
}

.buddy[data-mood="happy"] {
  transform: translateY(-5px);
}

.buddy-shadow {
  position: absolute;
  bottom: 24px;
  width: 180px;
  height: 20px;
  border-radius: 99px;
  background: rgba(31, 41, 55, 0.13);
}

.camera-panel {
  padding: 16px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.camera-frame {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #e9f2ef;
}

.camera-frame video,
.camera-frame canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  color: var(--muted);
  text-align: center;
  font-size: 14px;
  line-height: 1.5;
}

.camera-frame.active .camera-placeholder {
  display: none;
}

.camera-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.conversation {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 690px;
}

.chat-log {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
  overflow-y: auto;
  background: linear-gradient(180deg, rgba(223, 245, 233, 0.54), rgba(255, 253, 248, 0.94));
}

.message {
  display: flex;
  gap: 10px;
  max-width: 84%;
  align-items: flex-end;
}

.message.user {
  align-self: flex-end;
  justify-content: flex-end;
}

.avatar {
  width: 32px;
  height: 32px;
  border: 2px solid var(--ink);
  border-radius: 10px;
  background: var(--lemon);
  flex: 0 0 auto;
}

.bubble {
  padding: 12px 13px;
  border: 1px solid var(--line);
  border-radius: 14px 14px 14px 4px;
  background: #ffffff;
  line-height: 1.55;
  font-size: 15px;
  word-break: keep-all;
  overflow-wrap: anywhere;
  box-shadow: 0 8px 20px rgba(31, 41, 55, 0.08);
}

.message.user .bubble {
  border-color: rgba(79, 118, 216, 0.26);
  border-radius: 14px 14px 4px 14px;
  background: #edf2ff;
}

.controls {
  display: grid;
  gap: 10px;
  padding: 14px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.control-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.live-transcript,
.fallback-box {
  min-height: 48px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdfb;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.fallback-form {
  display: none;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

.fallback-form.show {
  display: grid;
}

.text-input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 12px;
  background: #ffffff;
  color: var(--ink);
  outline: none;
}

.text-input:focus,
textarea:focus {
  border-color: var(--sea);
  box-shadow: 0 0 0 4px rgba(58, 166, 160, 0.14);
}

.progress-list {
  display: grid;
  gap: 9px;
}

.memory-card {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.memory-card strong {
  font-size: 13px;
}

.memory-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 14px;
}

.progress-item {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 10px;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.progress-item strong {
  font-size: 13px;
}

.progress-item span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.stat {
  min-height: 84px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.stat strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
  line-height: 1.1;
}

.admin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: 16px;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  background: #ffffff;
}

th, td {
  padding: 11px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 13px;
}

th {
  position: sticky;
  top: 0;
  background: #f7fbf9;
  color: var(--muted);
  font-weight: 800;
}

tr.student-row {
  cursor: pointer;
}

tr.student-row:hover td {
  background: #f8fbfa;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 8px;
  border-radius: 999px;
  background: #f2f4f7;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.status-badge.done {
  background: #eaf8ef;
  color: var(--good);
}

.status-badge.watch {
  background: #fff3e0;
  color: var(--warn);
}

.detail-list {
  display: grid;
  gap: 10px;
}

.detail-item {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #ffffff;
}

.detail-item strong {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
}

.detail-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 14px;
}

.transcript {
  max-height: 260px;
  overflow: auto;
}

.download-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.delete-card {
  margin-bottom: 16px;
}

.delete-form {
  display: grid;
  grid-template-columns: minmax(180px, 0.5fr) minmax(180px, 0.5fr) auto;
  gap: 10px;
  padding: 16px;
}

.delete-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .layout,
  .admin-grid {
    grid-template-columns: 1fr;
  }

  .conversation {
    min-height: 650px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 20px, 1180px);
    padding: 14px 0;
  }

  .topbar,
  .card-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-actions {
    justify-content: flex-start;
  }

  .home-grid,
  .control-row,
  .camera-actions,
  .fallback-form,
  .delete-form {
    grid-template-columns: 1fr;
  }

  .student-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .message {
    max-width: 96%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}