:root {
  --bg-primary: #0a0e17;
  --bg-surface: #111827;
  --bg-surface-hover: #172033;
  --bg-input: #1a2234;
  --border-subtle: #243046;
  --border-focus: #3b82f6;

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --accent-amber: #f59e0b;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

/* Header */
.app-header {
  background: rgba(17, 24, 39, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.75rem 1.5rem;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

.brand-subtitle {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 0.35rem;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.status-badge.online {
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
}

.status-badge.online .pulse-dot {
  background-color: var(--accent-emerald);
}

.status-badge.checking .pulse-dot {
  background-color: var(--accent-amber);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* Main Container */
.app-main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
  overflow-x: auto;
}

.nav-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--text-main);
}

.nav-tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.tab-pane {
  display: none;
}

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

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.metric-card {
  padding: 1.25rem;
  border-left: 3px solid var(--border-subtle);
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.metric-value {
  font-size: 1.45rem;
  font-weight: 700;
  color: #fff;
  margin: 0.35rem 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.metric-value.highlight {
  color: var(--accent-cyan);
}

.metric-value.success {
  color: var(--accent-emerald);
}

.metric-sub {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Action Bar */
.action-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

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

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

.btn-secondary {
  background: var(--bg-surface-hover);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--border-subtle);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

.btn-copy {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-copy:hover {
  color: #fff;
  border-color: var(--accent-primary);
}

.btn-group {
  display: flex;
  gap: 0.75rem;
}

/* Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-input, .form-select {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 0.95rem;
  padding: 0.65rem 1rem;
  outline: none;
  font-family: inherit;
  transition: border-color 0.15s ease;
}

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

.form-input-sm, .form-select-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Toggle Switch */
.form-toggle-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.form-toggle-title {
  font-weight: 600;
  color: #fff;
}

.form-toggle-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  transition: 0.2s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.2s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

input:checked + .slider:before {
  transform: translateX(24px);
}

/* Info Alert */
.info-alert {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.alert-error {
  background: rgba(244, 63, 94, 0.1);
  border-color: rgba(244, 63, 94, 0.3);
}

/* Diagnostics Panel */
.test-results-panel {
  padding: 1.25rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.test-panel-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.diag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.diag-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.diag-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.diag-body {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-surface-hover);
  border: 1px solid var(--border-subtle);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge-danger {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

/* Helper Box */
.helper-box {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.helper-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.4rem;
}

.helper-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.code-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #38bdf8;
}

/* URL Copy Section */
.url-copy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.url-copy-box {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.url-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  display: block;
}

.copy-input-group {
  display: flex;
  gap: 0.5rem;
}

.copy-input-group .form-input {
  flex: 1;
}

/* Steps List */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.step-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-number {
  background: var(--accent-primary);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.step-text {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.step-text strong {
  color: #fff;
}

/* Channels Explorer */
.filters-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  max-height: 600px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.channel-card {
  background: var(--bg-surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.channel-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.channel-logo-wrap {
  width: 60px;
  height: 60px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.channel-logo {
  max-width: 80%;
  max-height: 80%;
  object-fit: contain;
}

.channel-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.25rem;
  line-height: 1.2;
}

.channel-meta {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 420px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.input-prefix-group {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.input-prefix {
  padding: 0 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  border-right: 1px solid var(--border-subtle);
}

.input-prefix-group .form-input {
  border: none;
  background: transparent;
  flex: 1;
}

.otp-sent-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.85rem;
  background: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent-primary);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }
.letter-spacing-lg { letter-spacing: 0.3em; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mb-3 { margin-bottom: 0.75rem; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.hidden { display: none !important; }

/* Login Page Wrapper */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
}

.login-card {
  max-width: 380px;
  width: 100%;
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 1.5rem;
  background: var(--bg-primary);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
}

.toast {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.2s ease-out;
  color: #fff;
}

.toast-success { background: #059669; }
.toast-error { background: #e11d48; }

@keyframes slideIn {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}