:root {
  --bg-app: #0c0e14;
  --bg-sidebar: #12151e;
  --bg-card: #181c28;
  --bg-card-hover: #1e2333;
  --bg-input: #151824;
  --border-color: #24293a;
  --border-focus: #4f46e5;
  --text-main: #e2e8f0;
  --text-muted: #8490a7;
  --text-code: #38bdf8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.app-layout {
  display: flex;
  height: 100vh;
  height: 100dvh;
  width: 100vw;
}

/* Sidebar */
.sidebar {
  width: 290px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.logo-box {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-status {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

.logo-title {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 1.5px;
  color: #fff;
}

/* Login Screen */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  width: 100vw;
  background-color: var(--bg-app);
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background-color: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
}

.login-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
}

.login-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.form-group label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.8px;
  font-family: var(--font-mono);
}

.form-group select,
.form-group input {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: #fff;
  padding: 10px 12px;
  font-size: 13px;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color 0.15s ease;
}

.form-group select:focus,
.form-group input:focus {
  border-color: var(--border-focus);
}

.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.remember-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.remember-label input[type="checkbox"] {
  accent-color: var(--primary);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

.auth-error-box {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--accent-red);
  color: #fca5a5;
  font-size: 12px;
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
}

.btn-block {
  width: 100%;
  padding: 11px;
  font-size: 13px;
  letter-spacing: 0.5px;
}

.identity-logged {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 10px;
}

.identity-info {
  display: flex;
  align-items: center;
  gap: 6px;
}

.identity-label {
  font-size: 9px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.identity-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-cyan);
}

.btn-logout {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.btn-logout:hover {
  color: var(--accent-red);
  background-color: rgba(239, 68, 68, 0.1);
}

.node-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.node-section-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
  padding: 10px 8px 4px 8px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

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

.node-item.active {
  background-color: var(--border-color);
  border-left: 3px solid var(--primary);
}

.node-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.node-name {
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-mono);
}

.node-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.node-badge {
  background-color: var(--bg-input);
  color: var(--text-muted);
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 12px;
  font-family: var(--font-mono);
  border: 1px solid var(--border-color);
}

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  font-family: var(--font-mono);
  text-align: center;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-app);
  position: relative;
  overflow: hidden;
}

.main-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-sidebar);
}

.header-titles h2 {
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: #fff;
}

.header-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

/* Feed Stream */
.feed-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 24px;
  display: flex;
  flex-direction: column;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.scroll-bottom-btn {
  position: absolute;
  bottom: 110px;
  right: 28px;
  background-color: var(--bg-card);
  color: var(--accent-cyan);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  z-index: 50;
  display: none;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  user-select: none;
}

.scroll-bottom-btn:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.scroll-bottom-btn.show {
  display: inline-flex;
}

.scroll-bottom-btn.has-new {
  border-color: var(--accent-green);
  color: var(--accent-green);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
}

.empty-state {
  margin: auto;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
  border: 1px dashed var(--border-color);
  padding: 32px;
  border-radius: 8px;
  max-width: 450px;
}

.feed-stream {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
}

/* Memos Card */
.memo-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.15s ease;
  position: relative;
}

.memo-card:hover {
  border-color: #3b4259;
}

.memo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.memo-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
}

.sender-pill {
  background-color: #272f45;
  color: var(--accent-cyan);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-weight: 600;
}

.target-pill {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.memo-time {
  color: var(--text-muted);
}

.memo-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.icon-btn:hover {
  background-color: var(--bg-input);
  color: var(--text-main);
  border-color: #4b5563;
}

.icon-btn.delete-btn:hover {
  color: var(--accent-red);
  border-color: var(--accent-red);
}

/* Memo Body */
.memo-body {
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: #f1f5f9;
}

.memo-body.code-block {
  font-family: var(--font-mono);
  background-color: #0d1117;
  padding: 12px;
  border-radius: 6px;
  border: 1px solid #21262d;
  color: var(--text-code);
  font-size: 12px;
  overflow-x: auto;
}

/* Image Preview */
.image-preview-container {
  border-radius: 6px;
  overflow: hidden;
  background-color: #0b0d13;
  border: 1px solid var(--border-color);
  max-width: 100%;
  display: flex;
}

.preview-img {
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
  display: block;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.preview-img:hover {
  opacity: 0.92;
}

/* File Card */
.file-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px 16px;
  gap: 12px;
}

.file-left {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.file-icon {
  font-size: 20px;
}

.file-details {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.file-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.file-size {
  font-size: 11px;
  color: var(--text-muted);
}

/* Composer */
.composer-container {
  background-color: var(--bg-sidebar);
  border-top: 1px solid var(--border-color);
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.composer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
}

.file-attach-btn {
  color: var(--accent-cyan);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px dashed var(--border-color);
  transition: all 0.15s ease;
}

.file-attach-btn:hover {
  background-color: var(--bg-input);
  border-color: var(--accent-cyan);
}

.composer-hint {
  color: var(--text-muted);
}

.composer-input-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.composer-input-row textarea {
  flex: 1;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 10px 14px;
  resize: vertical;
  min-height: 52px;
  max-height: 220px;
  outline: none;
  transition: border-color 0.15s ease;
}

.composer-input-row textarea:focus {
  border-color: var(--border-focus);
}

.btn {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
  font-family: var(--font-sans);
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
}

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

.btn-secondary {
  background-color: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card);
}

/* Upload Progress */
.upload-progress-bar {
  height: 6px;
  background-color: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background-color: var(--accent-cyan);
  transition: width 0.2s ease;
}

/* Drag overlay */
.drag-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(12, 14, 20, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.drag-box {
  border: 2px dashed var(--accent-cyan);
  border-radius: 12px;
  padding: 60px 80px;
  text-align: center;
}

.drag-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: #1e293b;
  border: 1px solid var(--accent-cyan);
  color: #fff;
  font-size: 12px;
  padding: 10px 18px;
  border-radius: 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translateY(10px);
  z-index: 1000;
  font-family: var(--font-mono);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Lightbox Modal */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(10, 12, 18, 0.9);
  backdrop-filter: blur(4px);
}

.lightbox-content {
  position: relative;
  z-index: 1000;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.lightbox-close-btn {
  position: absolute;
  top: -38px;
  right: 0;
  background: #1e2433;
  color: #fff;
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lightbox-close-btn:hover {
  background: var(--accent-red);
  border-color: var(--accent-red);
}

.lightbox-img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.85);
  border: 1px solid var(--border-color);
}

.lightbox-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  word-break: break-all;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.mobile-menu-btn {
  display: none;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.sidebar-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: -310px;
    bottom: 0;
    width: 280px;
    z-index: 200;
    transition: left 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: none;
  }

  .sidebar.open {
    left: 0;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.85);
  }

  .mobile-menu-btn {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    font-size: 11px;
    white-space: nowrap;
    font-family: var(--font-mono);
  }

  .main-content {
    width: 100vw;
  }

  .main-header {
    padding: 12px 14px;
  }

  .header-titles h2 {
    font-size: 14px;
  }

  .header-subtitle {
    display: none;
  }

  .feed-container {
    padding: 12px 10px;
  }

  .feed-stream {
    gap: 12px;
  }

  .memo-card {
    padding: 12px;
  }

  .preview-img {
    max-height: 250px;
  }

  .composer-container {
    padding: 10px 12px;
  }

  .composer-hint {
    display: block;
    font-size: 10px;
    color: var(--text-muted);
  }

  .composer-input-row textarea {
    font-size: 16px;
    min-height: 44px;
    padding: 8px 10px;
    line-height: 1.4;
  }

  .scroll-bottom-btn {
    bottom: 105px;
    right: 16px;
    font-size: 10px;
    padding: 5px 12px;
  }

  .btn {
    padding: 8px 12px;
  }

  .lightbox-modal {
    padding: 10px;
  }

  .lightbox-img {
    max-height: 72vh;
  }

  .lightbox-close-btn {
    top: -34px;
    padding: 3px 8px;
    font-size: 11px;
  }
}