/* === Base === */
:root {
  --font-size-base: 18px;
  --font-size-large: 24px;
  --font-size-heading: 32px;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-success: #16a34a;
  --color-error: #dc2626;
  --color-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-text: #111827;
  --color-border: #e5e7eb;
  --spacing: 16px;
  --radius: 8px;
  --max-width: 600px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg-alt);
  margin: 0;
  padding: 0;
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

/* === Nav === */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing) 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: calc(var(--spacing) * 2);
}

.logo {
  font-size: var(--font-size-large);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

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

.nav-user {
  font-weight: 600;
  color: var(--color-muted);
}

/* === Footer === */
footer {
  text-align: center;
  padding: calc(var(--spacing) * 2) 0 var(--spacing);
  color: var(--color-muted);
  font-size: 14px;
}

/* === Typography === */
h1 {
  font-size: var(--font-size-heading);
  margin: 0 0 8px;
}

h2 {
  font-size: var(--font-size-large);
  margin: 0 0 var(--spacing);
}

.subtitle {
  color: var(--color-muted);
  font-size: var(--font-size-large);
  margin: 0 0 calc(var(--spacing) * 2);
}

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

/* === Center content (login, register, select-user) === */
.center-content {
  position: relative;
  text-align: center;
  padding-top: calc(var(--spacing) * 3);
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: var(--font-size-base);
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background-color 0.15s, border-color 0.15s;
  min-height: 48px;
}

.btn-large {
  padding: 16px 32px;
  font-size: var(--font-size-large);
  min-height: 56px;
  min-width: 140px;
}

.btn-small {
  padding: 6px 14px;
  font-size: 14px;
  min-height: 36px;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}

.btn-user {
  background: white;
  color: var(--color-text);
  border: 2px solid var(--color-border);
  width: 100%;
  padding: 20px;
  font-size: var(--font-size-large);
  min-height: 64px;
}

.btn-user:hover {
  border-color: var(--color-primary);
  background: #eff6ff;
}

/* === Forms === */
.form-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
  max-width: 400px;
  margin: 0 auto;
}

label {
  font-weight: 600;
  font-size: var(--font-size-base);
  text-align: left;
}

.input-large {
  padding: 14px 16px;
  font-size: var(--font-size-large);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  width: 100%;
  outline: none;
  transition: border-color 0.15s;
}

.input-large:focus {
  border-color: var(--color-primary);
}

.inline-form {
  display: contents;
}

/* === User grid (select-user) === */
.user-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  max-width: 400px;
  margin: 0 auto calc(var(--spacing) * 2);
}

.divider {
  border-top: 2px solid var(--color-border);
  margin: calc(var(--spacing) * 2) auto;
  max-width: 400px;
}

.link-back {
  display: inline-block;
  margin-top: calc(var(--spacing) * 2);
  color: var(--color-primary);
  font-size: var(--font-size-base);
}

/* === Alerts === */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-weight: 600;
  margin-bottom: var(--spacing);
}

.alert-error {
  background: #fef2f2;
  color: var(--color-error);
  border: 1px solid #fecaca;
}

/* === Cards === */
.card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: calc(var(--spacing) * 1.5);
  margin-bottom: var(--spacing);
}

/* === Member list === */
.member-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.member-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-large);
}

.member-item:last-child {
  border-bottom: none;
}

.status-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.online {
  background: var(--color-success);
}

.status-dot.offline {
  background: var(--color-border);
}

.member-name.is-me {
  font-weight: 700;
}

/* === Language toggle === */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 10px;
  cursor: pointer;
  color: var(--color-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: border-color 0.15s, color 0.15s;
  min-height: 32px;
}

.lang-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-icon {
  flex-shrink: 0;
}

.lang-label {
  line-height: 1;
}

/* Language toggle on pages without nav (login, select-user, register) */
.lang-top-right {
  position: absolute;
  top: var(--spacing);
  right: var(--spacing);
}

/* === Nav links === */
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--color-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  padding: 4px 10px;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover {
  color: var(--color-primary);
  background: #eff6ff;
}

/* === Wide container (vacation page) === */
.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === Vacation page === */
.vacation-header {
  display: flex;
  align-items: center;
  gap: var(--spacing);
  flex-wrap: wrap;
  margin-bottom: calc(var(--spacing) * 1.5);
}

.vacation-header h1 {
  font-size: 22px;
  margin: 0;
  white-space: nowrap;
}

.year-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.year-display {
  font-weight: 700;
  font-size: 18px;
  min-width: 50px;
  text-align: center;
}

.vacation-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: calc(var(--spacing) * 1.5);
  align-items: start;
}

/* Calendar grid */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing);
}

.month-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px;
}

.month-header {
  text-align: center;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.weekday-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-size: 11px;
  color: var(--color-muted);
  font-weight: 600;
  margin-bottom: 4px;
}

.days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.day-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  border-radius: 3px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  position: relative;
}

.day-cell:not(.empty):hover {
  transform: scale(1.15);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  z-index: 1;
}

.day-cell.empty {
  cursor: default;
}

.day-cell.weekend {
  color: var(--color-muted);
}

.day-cell.public-holiday {
  border: 1.5px dashed var(--color-error);
  font-weight: 600;
}

.day-cell.has-vacation {
  font-weight: 700;
}

.day-cell.proposed {
  border: 1.5px dashed var(--color-muted);
  opacity: 0.7;
}

/* Vacation sidebar */
.vacation-sidebar {
  position: sticky;
  top: var(--spacing);
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
}

.sidebar-section {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px;
}

.sidebar-section h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-muted);
  margin: 0 0 10px;
}

/* Legend */
.legend-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background 0.1s;
}

.legend-item:last-child {
  border-bottom: none;
}

.legend-item:hover {
  background: var(--color-bg-alt);
}

.legend-swatch {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  flex-shrink: 0;
  margin-top: 2px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.legend-info {
  flex: 1;
  min-width: 0;
}

.legend-name {
  display: block;
  font-weight: 600;
  font-size: 13px;
  line-height: 1.3;
}

.legend-dates {
  display: block;
  font-size: 11px;
}

.legend-actions {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  color: var(--color-muted);
  padding: 2px 4px;
  border-radius: 3px;
  line-height: 1;
  transition: color 0.15s, background 0.15s;
}

.btn-icon:hover {
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

/* Badge */
.badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.badge-proposed {
  background: #fef3c7;
  color: #92400e;
}

/* Stats */
.stats-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 13px;
}

.stats-total {
  border-top: 1.5px solid var(--color-border);
  margin-top: 4px;
  padding-top: 6px;
}

/* Proposals */
.proposal-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.proposal-item:last-child {
  border-bottom: none;
}

.proposal-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

/* === Modals === */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: var(--radius);
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  font-size: 18px;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-muted);
  padding: 0 4px;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-body {
  padding: var(--spacing);
}

/* Form elements inside modals */
.form-group {
  margin-bottom: var(--spacing);
}

.form-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing);
}

.form-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding-top: 8px;
}

/* Color picker */
.color-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.color-option {
  cursor: pointer;
  font-weight: normal;
}

.color-option input[type="radio"] {
  display: none;
}

.color-swatch {
  display: block;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  border: 2px solid transparent;
  transition: border-color 0.15s, transform 0.1s;
}

.color-option input[type="radio"]:checked + .color-swatch {
  border-color: var(--color-text);
  transform: scale(1.1);
}

.color-swatch:hover {
  transform: scale(1.1);
}

/* Checkbox label */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: normal;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Comments */
.comments-list {
  margin-bottom: var(--spacing);
}

.comment-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.comment-item:last-child {
  border-bottom: none;
}

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

.comment-time {
  font-size: 11px;
  margin-left: 8px;
}

.comment-item p {
  margin: 4px 0 0;
}

.comment-form {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.comment-form textarea {
  flex: 1;
  padding: 8px 10px;
  font-size: 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  resize: vertical;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

.comment-form textarea:focus {
  border-color: var(--color-primary);
}

/* === Responsive: vacation page === */
@media (max-width: 1200px) {
  .calendar-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .vacation-layout {
    grid-template-columns: 1fr;
  }

  .vacation-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 700px) {
  .calendar-grid {
    grid-template-columns: 1fr;
  }

  .vacation-sidebar {
    grid-template-columns: 1fr;
  }

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

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