/* ===== CSS Variables ===== */
:root {
  --color-dark: #2c3e50;
  --color-blue: #3498db;
  --color-blue-hover: #2980b9;
  --color-green: #27ae60;
  --color-red: #e74c3c;
  --color-red-hover: #c0392b;
  --color-gray: #95a5a6;
  --color-gray-hover: #7f8c8d;
  --color-border: #e0e3e7;
  --color-border-light: #f0f0f0;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --color-text: #2c3e50;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --sidebar-width: 320px;
  --topbar-height: 48px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
}

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

/* ===== Base ===== */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.5;
}

/* ===== Auth Page ===== */
#auth-page {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-blue) 100%);
  z-index: 10000;
}

.auth-container {
  background: var(--color-white);
  padding: 40px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  min-width: 360px;
  width: 100%;
  max-width: 420px;
}

.auth-container h1 {
  text-align: center;
  margin-bottom: 24px;
  color: var(--color-dark);
  font-size: 24px;
  font-weight: 700;
}

.auth-tabs {
  display: flex;
  margin-bottom: 20px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.auth-tab {
  flex: 1;
  padding: 10px;
  border: none;
  border-right: 1px solid var(--color-border);
  cursor: pointer;
  background: var(--color-white);
  color: var(--color-text-light);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}

.auth-tab:last-child {
  border-right: none;
}

.auth-tab:hover:not(.active) {
  background: var(--color-bg);
}

.auth-tab.active {
  background: var(--color-blue);
  color: var(--color-white);
}

/* ===== Form Inputs ===== */
input[type="text"],
input[type="password"],
input[type="email"] {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
  color: var(--color-text);
  background: var(--color-white);
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

form button[type="submit"] {
  display: block;
  width: 100%;
  padding: 12px;
  background: var(--color-blue);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  transition: background 0.2s;
  margin-top: 4px;
}

form button[type="submit"]:hover {
  background: var(--color-blue-hover);
}

#login-form,
#register-form {
  display: flex;
  flex-direction: column;
}

/* ===== Messages ===== */
.error-msg {
  color: var(--color-red);
  font-size: 13px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background: #fdf0ef;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-red);
}

.success-msg {
  color: var(--color-green);
  font-size: 13px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background: #eafaf1;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-green);
}

/* ===== Topbar ===== */
#topbar {
  height: var(--topbar-height);
  background: var(--color-dark);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  flex-shrink: 0;
  z-index: 100;
}

#topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

#topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

#topbar-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

#topbar-user {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.75);
  margin-right: 4px;
}

/* ===== Icon & Topbar Buttons ===== */
.icon-btn,
.topbar-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s, border-color 0.2s;
  line-height: 1;
}

.icon-btn:hover,
.topbar-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.icon-btn {
  font-size: 18px;
  padding: 4px 10px;
}

/* ===== Main Content ===== */
#main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ===== Sidebar ===== */
#sidebar {
  width: var(--sidebar-width);
  background: var(--color-white);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.2s ease;
  overflow: hidden;
}

#sidebar.collapsed {
  width: 0;
  border-right: none;
}

/* ===== Sidebar Tabs ===== */
#sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.sidebar-tab {
  flex: 1;
  padding: 12px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-light);
  transition: color 0.2s;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}

.sidebar-tab:hover:not(.active) {
  color: var(--color-text);
  background: var(--color-bg);
}

.sidebar-tab.active {
  color: var(--color-blue);
  border-bottom-color: var(--color-blue);
}

/* ===== Sidebar Tab Content ===== */
.sidebar-tab-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

#browser-tab {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

#stats-tab {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

/* ===== Breadcrumb ===== */
#breadcrumb {
  padding: 8px 12px;
  font-size: 13px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bc-item {
  cursor: pointer;
  color: var(--color-blue);
  transition: text-decoration 0.1s;
}

.bc-item:hover {
  text-decoration: underline;
}

.bc-item:last-child {
  color: var(--color-text);
  cursor: default;
  font-weight: 500;
}

.bc-item:last-child:hover {
  text-decoration: none;
}

.bc-sep {
  color: var(--color-text-lighter);
  margin: 0 4px;
}

/* ===== Browser Actions ===== */
#browser-actions {
  display: flex;
  gap: 8px;
  padding: 8px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.action-btn {
  padding: 6px 12px;
  border: 1px solid var(--color-blue);
  color: var(--color-blue);
  background: var(--color-white);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.2s, color 0.2s;
  font-weight: 500;
}

.action-btn:hover {
  background: var(--color-blue);
  color: var(--color-white);
}

/* ===== Browser List ===== */
#browser-list {
  flex: 1;
  overflow-y: auto;
}

.dir-item,
.track-item {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border-light);
  cursor: pointer;
  position: relative;
  gap: 8px;
  transition: background 0.15s;
  min-height: 40px;
}

.dir-item:hover,
.track-item:hover {
  background: var(--color-bg);
}

.item-icon {
  flex-shrink: 0;
  width: 20px;
  text-align: center;
  font-size: 15px;
}

.item-name {
  flex: 1;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-text);
}

.item-meta {
  font-size: 12px;
  color: var(--color-text-light);
  flex-shrink: 0;
}

.item-date {
  font-size: 11px;
  color: var(--color-text-lighter);
  flex-shrink: 0;
}

.item-actions {
  display: none;
  gap: 4px;
  flex-shrink: 0;
}

.dir-item:hover .item-actions,
.track-item:hover .item-actions {
  display: flex;
}

.item-btn {
  background: none;
  border: 1px solid #ddd;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 2px 6px;
  font-size: 13px;
  line-height: 1.4;
  transition: background 0.15s;
  color: var(--color-text-light);
}

.item-btn:hover {
  background: var(--color-border-light);
  border-color: #bbb;
}

.empty-list {
  color: var(--color-text-lighter);
  font-size: 13px;
  text-align: center;
  padding: 32px 16px;
}

.loading {
  color: var(--color-text-light);
  text-align: center;
  padding: 24px 16px;
  font-size: 13px;
}

/* ===== Map Container ===== */
#map-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#map {
  width: 100%;
  height: 100%;
}

.drag-over {
  outline: 4px dashed var(--color-blue);
  outline-offset: -4px;
}

/* ===== Track Info Panel ===== */
#track-info-panel {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 16px;
  min-width: 220px;
  max-width: 300px;
  z-index: 1000;
}

#track-info-panel h3 {
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  padding-right: 24px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 4px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.info-row:last-child {
  border-bottom: none;
}

.info-row label {
  color: var(--color-text-light);
}

.info-row span {
  font-weight: 500;
  color: var(--color-text);
}

#track-info-close {
  position: absolute;
  top: 8px;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: var(--color-text-lighter);
  line-height: 1;
  padding: 2px 4px;
  transition: color 0.15s;
}

#track-info-close:hover {
  color: var(--color-text);
}

/* ===== Modals ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.modal-content {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-width: 300px;
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.modal-large {
  min-width: min(700px, 95vw);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text-lighter);
  line-height: 1;
  padding: 2px 6px;
  transition: color 0.15s;
}

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

/* ===== Buttons ===== */
.btn-primary {
  padding: 8px 16px;
  background: var(--color-blue);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

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

.btn-secondary {
  padding: 8px 16px;
  background: var(--color-gray);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

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

.btn-danger {
  padding: 8px 16px;
  background: var(--color-red);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

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

.btn-small {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  font-weight: 500;
  transition: background 0.2s;
}

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

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

.btn-small.btn-secondary {
  background: var(--color-gray);
  color: var(--color-white);
}

.btn-small.btn-secondary:hover {
  background: var(--color-gray-hover);
}

.btn-small.btn-danger {
  background: var(--color-red);
  color: var(--color-white);
}

.btn-small.btn-danger:hover {
  background: var(--color-red-hover);
}

/* ===== Upload Toast ===== */
#upload-toast {
  position: fixed;
  top: 16px;
  right: 16px;
  background: var(--color-dark);
  color: var(--color-white);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  z-index: 99999;
  font-size: 14px;
  box-shadow: var(--shadow-md);
  max-width: 300px;
  word-break: break-word;
}

#upload-toast.success {
  background: var(--color-green);
}

#upload-toast.error {
  background: var(--color-red);
}

/* ===== Stats ===== */
.stats-section {
  margin-bottom: 24px;
}

.stats-section h3 {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.stat-row {
  display: flex;
  align-items: center;
  margin-bottom: 6px;
  gap: 8px;
}

.stat-row .stat-label {
  width: 80px;
  font-size: 12px;
  color: var(--color-text-light);
  flex-shrink: 0;
}

.stat-bar-wrap {
  flex: 1;
  height: 16px;
  background: var(--color-border-light);
  border-radius: 8px;
  overflow: hidden;
}

.stat-bar {
  height: 100%;
  background: var(--color-blue);
  border-radius: 8px;
  transition: width 0.3s ease;
  min-width: 2px;
}

.stat-row .stat-value {
  width: 80px;
  text-align: right;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
  color: var(--color-text);
}

/* ===== Admin Table ===== */
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.admin-table th {
  background: var(--color-bg);
  padding: 10px 12px;
  text-align: left;
  border-bottom: 2px solid #dee2e6;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.admin-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
  vertical-align: middle;
}

.admin-table tr:hover td {
  background: var(--color-bg);
}

.admin-table td:last-child {
  white-space: nowrap;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

/* ===== Move Dialog ===== */
#move-dir-list {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 4px;
}

.move-dir-item {
  padding: 8px 12px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  margin-bottom: 2px;
  font-size: 13px;
  transition: background 0.15s;
  color: var(--color-text);
}

.move-dir-item:hover {
  background: var(--color-border-light);
}

.move-dir-item.selected {
  background: #e8f4fd;
  border: 1px solid var(--color-blue);
  color: var(--color-blue);
  font-weight: 500;
}

/* ===== Share URL Box ===== */
.share-url-box {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.share-url-box input {
  flex: 1;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 0;
  color: var(--color-text-light);
  background: var(--color-bg);
}

.share-url-box button {
  flex-shrink: 0;
  padding: 8px 14px;
  background: var(--color-blue);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  transition: background 0.2s;
}

.share-url-box button:hover {
  background: var(--color-blue-hover);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #sidebar {
    position: absolute;
    left: 0;
    top: var(--topbar-height);
    bottom: 0;
    z-index: 500;
    box-shadow: var(--shadow-md);
  }

  #sidebar.collapsed {
    width: 0;
  }

  .modal-large {
    min-width: 95vw;
  }

  #track-info-panel {
    bottom: 10px;
    right: 10px;
    max-width: calc(100vw - 20px);
  }
}

@media (max-width: 480px) {
  .auth-container {
    min-width: unset;
    margin: 16px;
    padding: 28px 20px;
  }

  #topbar {
    padding: 0 10px;
  }

  #topbar-title {
    font-size: 14px;
  }

  .admin-table {
    font-size: 11px;
  }

  .admin-table th,
  .admin-table td {
    padding: 6px 8px;
  }
}