body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

:root {
  --bg: #0f1115;
  --text: #eef2f6;
  --muted: #a2acb8;
  --link: #8ab4f8;
  --surface: #171b21;
  --surface-alt: #1b2027;
  --surface-strong: #13171c;
  --border: #262c33;
  --border-strong: #313844;
  --placeholder: #21262d;
  --button: #6b8cff;
  --alert: #f28b82;
  --shadow: 0 18px 40px rgba(8, 10, 13, 0.35);
  --ring: 0 0 0 3px rgba(107, 140, 255, 0.25);
}

body.light {
  --bg: #f6f5f2;
  --text: #1f2328;
  --muted: #6b7280;
  --link: #3b6ea5;
  --surface: #ffffff;
  --surface-alt: #f0efeb;
  --surface-strong: #f7f6f3;
  --border: #e2ddd6;
  --border-strong: #d4cdc4;
  --placeholder: #e7e1da;
  --button: #4b7bbf;
  --alert: #b91c1c;
  --shadow: 0 18px 40px rgba(30, 35, 40, 0.12);
  --ring: 0 0 0 3px rgba(75, 123, 191, 0.25);
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: color-mix(in srgb, var(--link) 80%, var(--text));
}

h1, h2, h3, h4 {
  margin: 0 0 8px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 12px;
}

.site-header {
  background: var(--surface);
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 8px 24px rgba(8, 10, 13, 0.15);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-header h1 {
  font-size: 1.4rem;
}

.site-header h1 a {
  color: var(--text);
}

.site-header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.nav-left,
.nav-right {
  display: flex;
  gap: 12px;
  align-items: center;
}

.nav-left a,
.nav-right a {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--text);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-left a:hover,
.nav-right a:hover {
  background: var(--surface-alt);
}

.calendar-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(120px, 1fr));
  gap: 8px;
}

.calendar-head {
  text-align: center;
  font-weight: 600;
  color: var(--muted);
}

.calendar-cell {
  min-height: 120px;
  background: var(--surface-alt);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.calendar-date {
  font-weight: 600;
  color: var(--text);
}

.calendar-task {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  font-size: 0.85rem;
}

.content {
  padding: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.page-header .eyebrow {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.card {
  background: var(--surface);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card.danger {
  border: 1px solid var(--alert);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.form-grid .full {
  grid-column: 1 / -1;
}

.form-grid .form-action {
  display: flex;
  align-items: flex-end;
}

input, textarea, select, button {
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
  color: var(--text);
  box-sizing: border-box;
}

input:focus, textarea:focus, select:focus, button:focus {
  outline: none;
  box-shadow: var(--ring);
  border-color: color-mix(in srgb, var(--button) 70%, var(--border));
}

button {
  cursor: pointer;
  background: var(--button);
  border: none;
  color: #f8fafc;
}

button:hover {
  filter: brightness(1.05);
}

.actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.button {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--button);
  color: #f8fafc;
  text-align: center;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(8, 10, 13, 0.2);
}

.button.ghost {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.tile {
  background: var(--surface-alt);
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.tile h3 {
  margin-top: 10px;
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.tile img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
}

.placeholder {
  width: 100%;
  aspect-ratio: 1 / 1;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--placeholder);
  border-radius: 12px;
  border: 1px dashed var(--border-strong);
  color: var(--muted);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.media-frame {
  margin-top: 12px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-alt);
}

.media-frame img {
  width: 100%;
  height: auto;
  display: block;
}

.qr-frame {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  display: inline-flex;
}

.qr-frame img {
  width: 160px;
  height: 160px;
}

.inline {
  display: inline-flex;
  align-items: center;
  margin-right: 8px;
}

.inline button {
  width: auto;
  padding: 6px 10px;
  font-size: 0.85rem;
}

.inline + .inline {
  margin-left: 4px;
}

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

.alert {
  color: var(--alert);
  font-weight: 600;
}

.icon-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  margin-bottom: 6px;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 1rem;
  transition: transform 0.2s ease, background 0.2s ease;
}

.icon-button:hover {
  background: var(--placeholder);
  transform: translateY(-1px);
}

.icon-nav-button {
  width: auto;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface-alt);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.icon-nav-button:hover {
  background: var(--placeholder);
  transform: translateY(-1px);
}

.site-footer {
  padding: 16px 24px;
  text-align: center;
  color: var(--muted);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

@media (max-width: 980px) {
  .site-header nav {
    gap: 10px;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  .nav-left,
  .nav-right {
    flex-wrap: wrap;
  }

  .content {
    padding: 18px;
  }

  .calendar-grid {
    grid-template-columns: repeat(2, minmax(140px, 1fr));
  }
}

@media (max-width: 520px) {
  .calendar-grid {
    grid-template-columns: 1fr;
  }

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

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-content {
  width: 100%;
  max-width: 420px;
}

.login-card {
  text-align: left;
}

.login-card h1 {
  margin-top: 0;
  margin-bottom: 8px;
}