:root {
  --bg-primary: #08080a;
  --bg-card: #121216;
  --bg-card-hover: #18181e;
  --bg-elevated: #1c1c24;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(255, 255, 255, 0.24);
  --text-primary: #f4f4f6;
  --text-secondary: #9a9aa6;
  --text-muted: #5e5e6e;
  --accent-white: #ffffff;
  --status-green: #10b981;
  --status-green-bg: rgba(16, 185, 129, 0.12);
  --status-red: #ef4444;
  --status-red-bg: rgba(239, 68, 68, 0.12);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Roboto', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.45;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.ambient-glow {
  position: fixed;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 340px;
  height: 240px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.055) 0%, rgba(8, 8, 10, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.screen {
  display: none;
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 1;
}

.screen.active {
  display: flex;
  flex-direction: column;
}

#screen-loader {
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.loader-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border-subtle);
  border-top-color: var(--accent-white);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

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

.loader-sub {
  color: var(--text-secondary);
  font-size: 13px;
}

.mono-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.mono-badge.status-online {
  color: var(--status-green);
  border-color: rgba(16, 185, 129, 0.25);
  background: var(--status-green-bg);
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.mono-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 18px;
  transition: border-color 0.2s ease, transform 0.15s ease;
}

.register-container {
  padding: 20px 16px 32px;
  overflow-y: auto;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 13.5px;
  line-height: 1.5;
}

.bento-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.mini-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px;
}

.stat-val {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.stat-desc {
  font-size: 12px;
  color: var(--text-secondary);
}

.bento-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 4px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

.bento-input, .bento-textarea {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s ease;
}

.bento-input:focus, .bento-textarea:focus {
  border-color: var(--border-focus);
}

.mono-input {
  font-family: var(--font-mono);
}

.bento-textarea {
  resize: none;
}

.field-hint {
  font-size: 11.5px;
  color: var(--text-muted);
}

.btn-primary {
  width: 100%;
  background: var(--accent-white);
  color: #000000;
  border: none;
  border-radius: var(--radius-md);
  padding: 13px 18px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.1s ease;
}

.btn-primary:active {
  transform: scale(0.985);
  opacity: 0.9;
}

.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.mono-arrow {
  font-family: var(--font-mono);
  font-size: 16px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: rgba(18, 18, 22, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 10;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-green);
  box-shadow: 0 0 8px var(--status-green);
}

.mono-brand {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
}

.version-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-secondary);
}

.user-summary {
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.icon-btn:active {
  transform: scale(0.94);
}

.app-content {
  flex: 1;
  overflow-y: auto;
  padding: 14px 16px 90px;
}

.tab-pane {
  display: none;
  flex-direction: column;
  gap: 12px;
}

.tab-pane.active {
  display: flex;
}

.search-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
}

.search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
}

.search-input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 12px 10px 36px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

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

.directory-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.link-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 12px;
  text-decoration: underline;
  cursor: pointer;
}

.bento-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.user-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  cursor: pointer;
}

.user-card:active {
  transform: scale(0.985);
  background: var(--bg-card-hover);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--accent-white);
}

.user-name {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
}

.user-grade-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
}

.grade-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
}

.send-pill {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.section-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
}

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

.btn-clear {
  background: var(--status-red-bg);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.28);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-size: 11.5px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn-clear:active {
  opacity: 0.75;
}

.section-title {
  font-size: 17px;
  font-weight: 600;
  margin-top: 2px;
}

.tab-helper-text {
  font-size: 12.5px;
  color: var(--text-secondary);
  padding: 0 4px;
}

.messages-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.msg-card.unread-envelope {
  border-color: rgba(255, 255, 255, 0.22);
  background: linear-gradient(145deg, #15151b 0%, #101014 100%);
}

.msg-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sender-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.unread-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--status-green);
}

.msg-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.msg-body {
  font-size: 14.5px;
  color: var(--text-primary);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg-body.blurred {
  filter: blur(6px);
  user-select: none;
  opacity: 0.65;
  padding: 8px 0;
}

.msg-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.btn-open-envelope {
  width: 100%;
  background: var(--accent-white);
  color: #000;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
}

.btn-block-toggle {
  background: var(--status-red-bg);
  color: var(--status-red);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-sm);
  padding: 6px 11px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
}

.btn-unblock {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 12px;
  cursor: pointer;
}

.status-checks {
  font-family: var(--font-mono);
  font-size: 11.5px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.status-checks.read {
  color: var(--status-green);
}

.status-checks.unread {
  color: var(--text-muted);
}

.empty-state {
  text-align: center;
  padding: 36px 20px;
  color: var(--text-muted);
  font-size: 13.5px;
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 68px;
  background: rgba(14, 14, 18, 0.9);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid var(--border-subtle);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 20;
}

.nav-item {
  background: none;
  border: none;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s ease;
}

.nav-item.active {
  color: var(--accent-white);
}

.nav-icon-wrap {
  position: relative;
  display: inline-flex;
}

.unread-Counter {
  position: absolute;
  top: -5px;
  right: -9px;
  background: var(--status-green);
  color: #000;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  min-width: 16px;
  height: 16px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 50;
  padding: 12px;
}

.modal-sheet {
  width: 100%;
  max-width: 480px;
  background: var(--bg-card);
  border: 1px solid var(--border-focus);
  border-radius: 20px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: slideUp 0.2s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.modal-title {
  font-size: 17px;
  font-weight: 600;
  margin-top: 2px;
}

.textarea-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.alert-box {
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  line-height: 1.4;
}

.alert-error {
  background: var(--status-red-bg);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.toast {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-white);
  color: #000000;
  font-weight: 600;
  font-size: 13px;
  padding: 10px 16px;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 100;
  transition: opacity 0.2s ease;
}

.hidden {
  display: none !important;
}