/* ============================================
   课堂随机点名器 - Clean Flat Theme
   扁平 · 干净 · 高级
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0a0a12;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-card-hover: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --text-primary: #e8e8ec;
  --text-secondary: #8a8a9a;
  --text-muted: #4a4a5a;
  --accent: #c8a858;
  --accent-dim: rgba(200, 168, 88, 0.12);
  --accent-glow: rgba(200, 168, 88, 0.25);
  --danger: #c85a5a;
  --danger-bg: rgba(200, 90, 90, 0.08);
  --success: #5aa870;
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 180ms ease-out;
  --font: -apple-system, "SF Pro Display", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", monospace;
}

html {
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== Auth / Login Overlay ===== */
.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: var(--bg);
}

.auth-overlay.hidden {
  display: none;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  padding: 48px 36px;
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.auth-logo {
  text-align: center;
  margin-bottom: 40px;
}

.auth-logo-icon {
  display: none;
}

.auth-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.auth-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.auth-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.auth-tab {
  flex: 1;
  padding: 12px 0;
  border: none;
  background: transparent;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
  position: relative;
}

.auth-tab:hover {
  color: var(--text-secondary);
}

.auth-tab.active {
  color: var(--text-primary);
}

.auth-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.auth-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.auth-input {
  width: 100%;
  padding: 12px 0;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  font-size: 16px;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--transition);
  background: transparent;
  color: var(--text-primary);
}

.auth-input::placeholder {
  color: var(--text-muted);
}

.auth-input:focus {
  border-bottom-color: var(--accent);
}

.auth-submit {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  border-radius: var(--radius);
  margin-top: 12px;
  letter-spacing: 1px;
}

.auth-hint {
  text-align: center;
  font-size: 13px;
  margin-top: 16px;
  min-height: 18px;
  color: var(--danger);
  transition: opacity 0.2s;
}

.auth-hint:empty {
  opacity: 0;
}

.auth-submit:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Loading Overlay ===== */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 600;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}

.loading-overlay.hidden {
  display: none;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* ===== Header ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.3px;
}

.header-right {
  display: flex;
  gap: 6px;
  align-items: center;
}

/* --- User Info --- */
.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: 4px;
  cursor: default;
}

.user-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

.user-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-dim);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
}

.btn-logout {
  color: var(--text-muted);
}

.btn-logout:hover {
  color: var(--danger);
  border-color: rgba(200, 90, 90, 0.2);
  background: var(--danger-bg);
}

/* --- Icon Buttons --- */
.icon-btn {
  width: 38px;
  height: 38px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text-secondary);
}

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

/* --- Main Layout --- */
.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.center-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 28px 32px;
  overflow-y: auto;
}

/* --- Tab Bar --- */
.tab-bar {
  display: flex;
  gap: 2px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: transparent;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
  position: relative;
}

.tab-btn:hover {
  color: var(--text-secondary);
}

.tab-btn.active {
  color: var(--text-primary);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
}

/* --- Panel --- */
.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* --- Display Area --- */
.display-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  padding: 48px 24px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.display-area::before {
  display: none;
}

.display-area.rolling .display-name {
  color: var(--accent);
}

.display-area.result .display-name {
  animation: resultReveal 0.5s ease-out;
}

.display-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
  letter-spacing: 2px;
  text-transform: uppercase;
  transition: color 0.3s ease-out;
}

.display-area.result .display-label {
  color: var(--accent);
}

.display-name {
  font-size: 88px;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  line-height: 1.2;
  position: relative;
  z-index: 2;
  transition: color 0.3s;
  max-width: 100%;
  word-break: break-all;
  letter-spacing: 2px;
}

.display-name.glow {
  color: var(--text-primary);
  animation: resultReveal 0.5s ease-out;
}

.display-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 20px;
  position: relative;
  z-index: 2;
  letter-spacing: 0.5px;
}

@keyframes resultReveal {
  0% { transform: scale(0.92); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

/* Multi-name result */
.result-names {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  position: relative;
  z-index: 2;
}

.result-name-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 40px;
  font-weight: 700;
  animation: resultReveal 0.5s ease-out both;
  letter-spacing: 2px;
}

.result-name-card:nth-child(2) { animation-delay: 0.08s; }
.result-name-card:nth-child(3) { animation-delay: 0.16s; }
.result-name-card:nth-child(4) { animation-delay: 0.24s; }
.result-name-card:nth-child(5) { animation-delay: 0.32s; }

/* Fireworks Canvas */
#fireworksCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* --- Action Row --- */
.action-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

/* --- Settings Row --- */
.settings-row {
  display: flex;
  gap: 28px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.setting-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.setting-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* --- Number Stepper --- */
.num-stepper {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.step-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  font-size: 18px;
  font-weight: 400;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.step-btn:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

.num-stepper input {
  width: 48px;
  height: 36px;
  border: none;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  outline: none;
  -moz-appearance: textfield;
}

.num-stepper input::-webkit-inner-spin-button,
.num-stepper input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

/* --- Toggle Button --- */
.toggle-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}

.toggle-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-secondary);
}

.toggle-btn[data-active="true"] {
  background: var(--accent-dim);
  border-color: var(--accent-glow);
  color: var(--accent);
}

.toggle-knob {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all var(--transition);
}

.toggle-btn[data-active="true"] .toggle-knob {
  background: var(--accent);
}

.picked-text {
  font-size: 14px;
  color: var(--text-muted);
}

.picked-text strong {
  color: var(--accent);
  font-size: 16px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: var(--font);
}

.btn:hover {
  transform: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
}

.btn-lg {
  padding: 12px 28px;
  font-size: 16px;
}

.btn-xl {
  padding: 16px 48px;
  font-size: 20px;
  border-radius: var(--radius);
}

.btn-primary {
  background: var(--accent);
  color: #1a1a22;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #d4b868;
  border-color: #d4b868;
}

.btn-primary:disabled {
  background: var(--bg-card);
  border-color: var(--border);
  color: var(--text-muted);
  cursor: not-allowed;
}

.btn-success {
  background: rgba(90, 168, 112, 0.12);
  color: var(--success);
  border-color: rgba(90, 168, 112, 0.25);
}

.btn-success:hover {
  background: rgba(90, 168, 112, 0.2);
  border-color: rgba(90, 168, 112, 0.4);
}

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

.btn-outline:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.btn-danger-outline {
  background: transparent;
  color: var(--danger);
  border-color: rgba(200, 90, 90, 0.15);
}

.btn-danger-outline:hover {
  background: var(--danger-bg);
  border-color: rgba(200, 90, 90, 0.3);
}

.btn-danger {
  background: rgba(200, 90, 90, 0.12);
  color: var(--danger);
  border-color: rgba(200, 90, 90, 0.25);
}

.btn-danger:hover {
  background: rgba(200, 90, 90, 0.2);
  border-color: rgba(200, 90, 90, 0.4);
}

/* --- Sidebar --- */
.sidebar {
  width: 300px;
  background: rgba(0, 0, 0, 0.2);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar-section {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  letter-spacing: 0.3px;
}

.student-count {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
}

/* --- Class List --- */
.class-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 12px;
  max-height: 200px;
  overflow-y: auto;
}

.class-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.class-item:hover {
  background: var(--bg-card-hover);
}

.class-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent-glow);
}

.class-item-count {
  font-size: 12px;
  color: var(--text-muted);
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--bg-card);
}

.class-item.active .class-item-count {
  background: rgba(200, 168, 88, 0.1);
  color: var(--accent);
}

.class-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* --- Student Input --- */
.student-add-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.text-input {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--transition);
  background: transparent;
  color: var(--text-primary);
}

.text-input::placeholder {
  color: var(--text-muted);
}

.text-input:focus {
  border-color: var(--accent-glow);
}

.student-actions-row {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

/* --- Student List --- */
.student-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
  max-height: 400px;
  overflow-y: auto;
}

.student-item {
  display: flex;
  align-items: center;
  padding: 7px 10px;
  border-radius: var(--radius);
  transition: background var(--transition);
  font-size: 14px;
}

.student-item:hover {
  background: var(--bg-card-hover);
}

.student-item.picked {
  opacity: 0.3;
  text-decoration: line-through;
}

.student-index {
  width: 24px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.student-name {
  flex: 1;
  font-weight: 400;
  color: var(--text-secondary);
}

.student-item-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity var(--transition);
}

.student-item:hover .student-item-actions {
  opacity: 1;
}

.student-item-actions button {
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text-muted);
}

.student-item-actions button:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.student-item-actions .btn-del:hover {
  background: var(--danger-bg);
  color: var(--danger);
}

.student-edit-input {
  flex: 1;
  padding: 4px 8px;
  border: 1px solid var(--accent-glow);
  border-radius: 4px;
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  background: transparent;
  color: var(--text-primary);
}

/* --- Grouper Panel --- */
.grouper-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.group-results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.group-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: fadeInUp 0.4s ease-out both;
}

.group-card:nth-child(1) { animation-delay: 0s; }
.group-card:nth-child(2) { animation-delay: 0.07s; }
.group-card:nth-child(3) { animation-delay: 0.14s; }
.group-card:nth-child(4) { animation-delay: 0.21s; }
.group-card:nth-child(5) { animation-delay: 0.28s; }
.group-card:nth-child(6) { animation-delay: 0.35s; }
.group-card:nth-child(7) { animation-delay: 0.42s; }
.group-card:nth-child(8) { animation-delay: 0.49s; }

.group-card-header {
  padding: 12px 16px;
  background: var(--accent-dim);
  border-bottom: 1px solid var(--border);
  color: var(--accent);
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.group-card-header .group-count {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
}

.group-card-body {
  padding: 12px 16px;
}

.group-member {
  padding: 5px 0;
  font-size: 15px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.group-member-index {
  font-size: 12px;
  color: var(--text-muted);
  width: 18px;
  font-family: var(--font-mono);
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-card {
  background: #12121c;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 90%;
  max-width: 480px;
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.modal-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.modal-textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: var(--font);
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
  background: transparent;
  color: var(--text-primary);
}

.modal-textarea::placeholder {
  color: var(--text-muted);
}

.modal-textarea:focus {
  border-color: var(--accent-glow);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

/* --- Footer Bar --- */
.footer-bar {
  padding: 8px 24px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.footer-bar kbd {
  display: inline-flex;
  align-items: center;
  padding: 1px 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin: 0 2px;
}

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-muted);
  font-size: 14px;
}

.empty-state-icon {
  font-size: 32px;
  margin-bottom: 8px;
  opacity: 0.3;
}

/* --- Toast --- */
.toast {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%) translateY(-16px);
  padding: 10px 24px;
  background: #12121c;
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  z-index: 2000;
  opacity: 0;
  transition: all 0.3s ease-out;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  border-color: rgba(90, 168, 112, 0.25);
  color: var(--success);
}

.toast.error {
  border-color: rgba(200, 90, 90, 0.25);
  color: var(--danger);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .main-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .display-name {
    font-size: 56px;
  }

  .result-name-card {
    font-size: 28px;
    padding: 10px 20px;
  }

  .header-title {
    font-size: 16px;
  }

  .footer-bar {
    display: none;
  }

  .center-area {
    padding: 20px 16px;
  }
}

@media (max-width: 600px) {
  .center-area {
    padding: 16px 12px;
  }

  .display-name {
    font-size: 44px;
  }

  .result-name-card {
    font-size: 22px;
    padding: 8px 16px;
  }

  .btn-xl {
    padding: 14px 32px;
    font-size: 17px;
  }

  .settings-row {
    flex-direction: column;
    gap: 12px;
  }

  .sidebar {
    max-height: 50vh;
  }

  .auth-card {
    padding: 32px 24px;
  }

  .auth-title {
    font-size: 20px;
  }

  .header-right {
    gap: 4px;
  }

  .icon-btn {
    width: 34px;
    height: 34px;
    font-size: 15px;
  }

  .user-avatar {
    display: none;
  }

  .header {
    padding: 12px 16px;
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* --- Fullscreen --- */
body:fullscreen .header,
body:-webkit-full-screen .header {
  padding: 8px 24px;
}

body:fullscreen .display-name,
body:-webkit-full-screen .display-name {
  font-size: 120px;
}

body:fullscreen .result-name-card,
body:-webkit-full-screen .result-name-card {
  font-size: 52px;
}

/* --- Selection --- */
::selection {
  background: var(--accent-dim);
  color: var(--accent);
}