:root {
  --bg: #eef2f6;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --ink: #172033;
  --muted: #64748b;
  --line: #d8e1ec;
  --primary: #0f766e;
  --primary-strong: #115e59;
  --blue: #2563eb;
  --amber: #b45309;
  --rose: #be123c;
  --success: #15803d;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  letter-spacing: 0;
}

body.modal-open {
  overflow: hidden;
}

a {
  color: inherit;
}

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

.app-shell {
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 24px;
  background: #111827;
  color: #e5e7eb;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 8px;
  background: #14b8a6;
  color: #082f2d;
  font-weight: 800;
}

.brand strong,
.sidebar-account strong {
  display: block;
}

.brand small,
.sidebar-account small {
  color: #9ca3af;
}

.main-nav {
  display: grid;
  gap: 6px;
}

.main-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 8px 10px;
  border-radius: 8px;
  color: #cbd5e1;
  text-decoration: none;
}

.main-nav a.active,
.main-nav a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #64748b;
}

.main-nav a.active .nav-dot {
  background: #2dd4bf;
}

.sidebar-account {
  margin-top: auto;
  display: grid;
  gap: 5px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.text-link {
  width: fit-content;
  color: #99f6e4;
  text-decoration: none;
}

.main-panel {
  min-width: 0;
  padding: 28px;
}

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
}

h2 {
  margin-bottom: 16px;
  font-size: 22px;
}

h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.eyebrow {
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.two {
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.35fr);
}

.grid.stats {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.panel,
.stat-card,
.assignment-item,
.login-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel {
  padding: 20px;
}

.stat-card {
  min-height: 112px;
  padding: 18px;
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: 34px;
  line-height: 1;
}

.stat-card span {
  color: var(--muted);
}

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

.form-grid {
  display: grid;
  gap: 14px;
}

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

label {
  display: grid;
  gap: 7px;
  color: #334155;
  font-weight: 650;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-label input {
  width: 18px;
  min-height: 18px;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  padding: 9px 11px;
}

textarea {
  min-height: 108px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(20, 184, 166, 0.24);
  border-color: var(--primary);
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  border: 0;
  border-radius: 8px;
  background: var(--primary);
  color: #ffffff;
  padding: 9px 14px;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
}

.button:hover,
button:hover {
  background: var(--primary-strong);
}

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

.button.secondary:hover,
button.secondary:hover {
  background: var(--surface-soft);
}

.google-button {
  width: 100%;
  border: 1px solid var(--line);
  background: #ffffff;
  color: #1f2937;
}

.google-button:hover {
  background: var(--surface-soft);
}

.google-mark {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border: 1px solid #d1d5db;
  border-radius: 50%;
  color: #2563eb;
  font-weight: 800;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--line);
}

.button.danger,
button.danger {
  background: var(--rose);
}

.button.blue,
button.blue {
  background: var(--blue);
}

.button[disabled],
button[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
}

th,
td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f1f5f9;
  color: #475569;
  font-size: 13px;
}

tr:last-child td {
  border-bottom: 0;
}

.muted {
  color: var(--muted);
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 750;
}

.status.done {
  background: #dcfce7;
  color: #166534;
}

.status.pending {
  background: #fef3c7;
  color: #92400e;
}

.status.missing {
  background: #fee2e2;
  color: #991b1b;
}

.status.open {
  background: #dbeafe;
  color: #1e40af;
}

.assignment-list {
  display: grid;
  gap: 12px;
}

.assignment-item {
  padding: 16px;
}

.assignment-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.assignment-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f8fafc;
  color: #475569;
  padding: 4px 10px;
  font-size: 13px;
}

details {
  margin-top: 12px;
}

summary {
  cursor: pointer;
  color: var(--primary-strong);
  font-weight: 750;
}

.flash {
  margin-bottom: 18px;
  border-radius: 8px;
  padding: 12px 14px;
  background: #dbeafe;
  color: #1e3a8a;
}

.flash.success {
  background: #dcfce7;
  color: #14532d;
}

.flash.warning {
  background: #fef3c7;
  color: #78350f;
}

.flash.error {
  background: #fee2e2;
  color: #7f1d1d;
}

.progress-track {
  width: 100%;
  height: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: #e2e8f0;
}

.progress-fill {
  width: 0%;
  height: 100%;
  background: #14b8a6;
  transition: width 180ms ease;
}

.batch-log {
  min-height: 42px;
  margin-top: 10px;
  color: var(--muted);
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
  background:
    linear-gradient(135deg, rgba(20, 184, 166, 0.16), rgba(37, 99, 235, 0.08)),
    #eef2f6;
}

.login-card {
  width: min(980px, 100%);
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  overflow: hidden;
}

.login-visual {
  display: grid;
  align-content: end;
  gap: 18px;
  min-height: 520px;
  padding: 38px;
  background:
    linear-gradient(180deg, rgba(17, 24, 39, 0.2), rgba(17, 24, 39, 0.92)),
    url("../img/gradeflow-pattern.svg");
  background-size: cover;
  color: #ffffff;
}

.login-visual h1 {
  font-size: clamp(34px, 6vw, 58px);
}

.login-form {
  display: grid;
  align-content: center;
  gap: 18px;
  padding: 34px;
}

.account-hints {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.google-profile-preview {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.google-profile-preview img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
}

.google-profile-preview strong,
.google-profile-preview span {
  display: block;
}

.google-profile-preview span {
  color: var(--muted);
  font-size: 14px;
  overflow-wrap: anywhere;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.score-input {
  width: 96px;
}

.feedback-input {
  min-width: 240px;
  min-height: 72px;
}

.empty-state {
  padding: 28px;
  border: 1px dashed #94a3b8;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
}

.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.58);
}

.modal-dialog {
  width: min(720px, 100%);
  max-height: calc(100vh - 36px);
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 28px 70px rgba(15, 23, 42, 0.28);
}

.modal-dialog.wide {
  width: min(980px, 100%);
}

.modal-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.modal-header h2 {
  margin-bottom: 4px;
}

.modal-body {
  padding: 20px;
}

.icon-button {
  width: 38px;
  min-height: 38px;
  padding: 0;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

.icon-button:hover {
  background: var(--surface-soft);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.summary-item {
  display: grid;
  gap: 3px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.summary-item span {
  color: var(--muted);
  font-size: 13px;
}

.summary-item strong {
  font-size: 20px;
}

.display-list {
  display: grid;
  gap: 12px;
}

.account-list {
  display: grid;
  gap: 12px;
}

.account-row {
  display: grid;
  grid-template-columns: minmax(120px, 0.6fr) repeat(4, minmax(150px, 1fr)) minmax(160px, 1fr) minmax(150px, 1fr) minmax(150px, 0.9fr) minmax(130px, 0.7fr);
  gap: 10px;
  align-items: end;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.account-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.api-key-list {
  display: grid;
  gap: 12px;
}

.api-key-row {
  display: grid;
  grid-template-columns: minmax(150px, 0.9fr) minmax(180px, 1fr) minmax(130px, 0.7fr) minmax(90px, 0.4fr) minmax(150px, 0.8fr) minmax(140px, 0.8fr);
  gap: 12px;
  align-items: end;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .grid.two,
  .grid.stats,
  .login-card {
    grid-template-columns: 1fr;
  }

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

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

  .login-visual {
    min-height: 320px;
  }
}

@media (max-width: 640px) {
  .main-panel,
  .sidebar,
  .login-form,
  .login-visual {
    padding: 18px;
  }

  .topbar,
  .assignment-head {
    display: grid;
  }

  .form-grid.two {
    grid-template-columns: 1fr;
  }

  .account-row {
    grid-template-columns: 1fr;
  }

  .api-key-row {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 30px;
  }
}