/* =========================================================================
   DFUS - Design System & Component Styles
   Dark-mode technical dashboard
   ========================================================================= */

/* -------------------------------------------------------------------------
   CSS Custom Properties
   ------------------------------------------------------------------------- */
:root {
  /* Color palette */
  --bg-base:       #060910;
  --bg-surface:    #0b0f1a;
  --bg-panel:      #0e1423;
  --bg-card:       #121928;
  --bg-card-hover: #172035;
  --border:        #1c2b45;
  --border-bright: #2a3f64;

  /* Primary - electric blue */
  --primary:       #4f9cf9;
  --primary-dim:   #1a3a6e;
  --primary-glow:  rgba(79, 156, 249, 0.25);

  /* State colors */
  --state-pending:   #1a2040;
  --state-pending-b: #243060;
  --state-uploading:   #0d2d5e;
  --state-uploading-b: #4f9cf9;
  --state-success:   #062010;
  --state-success-b: #22c55e;
  --state-failed:    #2a0a0a;
  --state-failed-b:  #ef4444;

  /* Semantic colors */
  --success:  #22c55e;
  --error:    #ef4444;
  --warning:  #f59e0b;
  --info:     #4f9cf9;

  /* Typography */
  --text-primary:   #e2e8f0;
  --text-secondary: #94a3b8;
  --text-dim:       #4a5568;
  --text-accent:    #4f9cf9;

  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-panel: 0 1px 3px rgba(0,0,0,0.5), 0 0 0 1px var(--border);
  --shadow-card:  0 2px 8px rgba(0,0,0,0.6), 0 0 0 1px var(--border);
  --shadow-glow-primary: 0 0 20px var(--primary-glow);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 80% 40% at 50% -10%, rgba(79, 156, 249, 0.06) 0%, transparent 70%);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

.mono {
  font-family: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
}

.small {
  font-size: 0.85em;
}

/* -------------------------------------------------------------------------
   App Shell
   ------------------------------------------------------------------------- */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* -------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand-mark {
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(79, 156, 249, 0.4));
}

.brand-name {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-shrink: 0;
}

.server-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background var(--transition-normal);
  flex-shrink: 0;
}

.server-status.online .status-dot  { background: var(--success); box-shadow: 0 0 6px var(--success); }
.server-status.offline .status-dot { background: var(--error); }
.server-status.checking .status-dot {
  background: var(--warning);
  animation: status-pulse 1.4s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

.header-config {
  display: flex;
  gap: var(--space-2);
}

.config-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--primary-dim);
  color: var(--primary);
  border: 1px solid rgba(79, 156, 249, 0.2);
  white-space: nowrap;
}

/* -------------------------------------------------------------------------
   Main Content
   ------------------------------------------------------------------------- */
.main-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding-bottom: var(--space-12);
}

/* -------------------------------------------------------------------------
   Panels
   ------------------------------------------------------------------------- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-panel);
}

.panel-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-5);
}

/* -------------------------------------------------------------------------
   Inputs & Forms
   ------------------------------------------------------------------------- */
.input-field {
  width: 100%;
  background: var(--bg-base);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-field:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(79, 156, 249, 0.25);
}

/* -------------------------------------------------------------------------
   Drop Zone
   ------------------------------------------------------------------------- */
.drop-zone {
  border: 2px dashed var(--border-bright);
  border-radius: var(--radius-md);
  padding: var(--space-10) var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  position: relative;
  user-select: none;
}

.drop-zone:hover,
.drop-zone:focus-visible {
  border-color: var(--primary);
  background: rgba(79, 156, 249, 0.04);
  outline: none;
}

.drop-zone.drag-active {
  border-color: var(--primary);
  background: rgba(79, 156, 249, 0.08);
  box-shadow: var(--shadow-glow-primary);
}

.drop-zone.has-file {
  border-style: solid;
  border-color: var(--border-bright);
  padding: var(--space-5) var(--space-6);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.drop-icon {
  color: var(--text-dim);
  transition: color var(--transition-fast);
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-active .drop-icon {
  color: var(--primary);
}

.drop-primary {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.drop-link {
  color: var(--primary);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--transition-fast);
}

.drop-zone:hover .drop-link {
  text-decoration-color: var(--primary);
}

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

/* -------------------------------------------------------------------------
   File Info
   ------------------------------------------------------------------------- */
.file-info {
  margin-top: var(--space-5);
}

.file-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.info-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
}

.info-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.info-value {
  display: block;
  font-size: 0.85rem;
  color: var(--text-primary);
  word-break: break-all;
}

.hash-value {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

/* -------------------------------------------------------------------------
   Progress Bars
   ------------------------------------------------------------------------- */
.progress-container {
  margin-top: var(--space-3);
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.progress-track {
  height: 6px;
  background: var(--bg-card);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-fill {
  height: 100%;
  border-radius: 99px;
  width: 0%;
  transition: width var(--transition-normal);
}

.progress-fill-hash {
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.progress-fill-primary {
  background: linear-gradient(90deg, var(--primary-dim), var(--primary));
}

.progress-fill-success {
  background: linear-gradient(90deg, #064e3b, var(--success));
}

.overall-progress {
  margin-top: var(--space-4);
}

.overall-progress .progress-track {
  height: 8px;
}

/* -------------------------------------------------------------------------
   Upload Controls
   ------------------------------------------------------------------------- */
.upload-controls {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-5);
  flex-wrap: wrap;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast),
              box-shadow var(--transition-fast), opacity var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--primary);
  color: #030712;
  font-weight: 600;
}

.btn-primary:not(:disabled):hover {
  background: #6badff;
  box-shadow: 0 0 16px rgba(79, 156, 249, 0.35);
}

.btn-secondary {
  background: var(--primary-dim);
  color: var(--primary);
  border-color: rgba(79, 156, 249, 0.25);
}

.btn-secondary:not(:disabled):hover {
  background: #1e4080;
  border-color: var(--primary);
}

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

.btn-ghost:not(:disabled):hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.btn-danger-ghost {
  background: transparent;
  color: #f87171;
  border-color: rgba(239, 68, 68, 0.25);
}

.btn-danger-ghost:not(:disabled):hover {
  background: rgba(239, 68, 68, 0.08);
  border-color: var(--error);
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

.btn-icon {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

/* -------------------------------------------------------------------------
   Metrics Panel
   ------------------------------------------------------------------------- */
.metrics-panel {
  padding: var(--space-5) var(--space-6);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}

@media (max-width: 700px) {
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-4) var(--space-5);
}

.metric-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: var(--space-2);
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
}

.status-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 99px;
  font-family: 'JetBrains Mono', monospace;
}

.status-badge.badge-idle     { background: var(--bg-base); color: var(--text-dim); border: 1px solid var(--border); }
.status-badge.badge-hashing  { background: rgba(245,158,11,0.12); color: #fbbf24; border: 1px solid rgba(245,158,11,0.25); }
.status-badge.badge-ready    { background: var(--primary-dim); color: var(--primary); border: 1px solid rgba(79,156,249,0.25); }
.status-badge.badge-uploading{ background: rgba(79,156,249,0.12); color: #93c5fd; border: 1px solid rgba(79,156,249,0.3); }
.status-badge.badge-paused   { background: rgba(245,158,11,0.1); color: #f59e0b; border: 1px solid rgba(245,158,11,0.25); }
.status-badge.badge-merging  { background: rgba(139,92,246,0.12); color: #c4b5fd; border: 1px solid rgba(139,92,246,0.25); }
.status-badge.badge-complete { background: rgba(34,197,94,0.12); color: var(--success); border: 1px solid rgba(34,197,94,0.25); }
.status-badge.badge-error    { background: rgba(239,68,68,0.12); color: var(--error); border: 1px solid rgba(239,68,68,0.25); }

/* -------------------------------------------------------------------------
   Packet Matrix
   ------------------------------------------------------------------------- */
.matrix-panel {
  padding-bottom: var(--space-5);
}

.matrix-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.matrix-header .panel-title {
  margin-bottom: 0;
}

.matrix-legend {
  display: flex;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}

.swatch-pending   { background: var(--state-pending);   border: 1px solid var(--state-pending-b); }
.swatch-uploading { background: var(--state-uploading);  border: 1px solid var(--state-uploading-b); }
.swatch-success   { background: var(--state-success);   border: 1px solid var(--state-success-b); }
.swatch-failed    { background: var(--state-failed);    border: 1px solid var(--state-failed-b); }

.packet-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14px, 14px));
  gap: 3px;
  margin-bottom: var(--space-4);
  min-height: 20px;
}

.packet {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  border: 1px solid;
  cursor: default;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

.packet:hover {
  transform: scale(1.4);
  z-index: 10;
}

.packet.pending {
  background: var(--state-pending);
  border-color: var(--state-pending-b);
}

.packet.uploading {
  background: var(--state-uploading);
  border-color: var(--state-uploading-b);
  animation: chunk-upload-pulse 1.2s ease-in-out infinite;
  box-shadow: 0 0 6px rgba(79, 156, 249, 0.4);
}

.packet.success {
  background: var(--state-success);
  border-color: var(--state-success-b);
}

.packet.failed {
  background: var(--state-failed);
  border-color: var(--state-failed-b);
  animation: chunk-failed-throb 2s ease-in-out infinite;
}

@keyframes chunk-upload-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 6px rgba(79, 156, 249, 0.4); }
  50%       { opacity: 0.65; box-shadow: 0 0 12px rgba(79, 156, 249, 0.7); }
}

@keyframes chunk-failed-throb {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

.matrix-footer {
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
  color: var(--text-dim);
}

/* -------------------------------------------------------------------------
   Activity Log
   ------------------------------------------------------------------------- */
.log-panel {
  max-height: 320px;
  display: flex;
  flex-direction: column;
}

.log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}

.log-header .panel-title {
  margin-bottom: 0;
}

.activity-log {
  overflow-y: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.activity-log::-webkit-scrollbar {
  width: 4px;
}

.activity-log::-webkit-scrollbar-track {
  background: transparent;
}

.activity-log::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.log-entry {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: 1px solid rgba(28, 43, 69, 0.5);
  font-size: 0.8rem;
  line-height: 1.5;
  animation: log-slide-in 200ms ease;
}

@keyframes log-slide-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.log-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.log-level {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 1px 5px;
  border-radius: 3px;
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
}

.log-level-info    { background: rgba(79,156,249,0.12); color: var(--info); }
.log-level-success { background: rgba(34,197,94,0.12); color: var(--success); }
.log-level-warn    { background: rgba(245,158,11,0.12); color: var(--warning); }
.log-level-error   { background: rgba(239,68,68,0.12); color: var(--error); }

.log-message {
  color: var(--text-secondary);
}

.log-empty {
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: var(--space-4) 0;
  text-align: center;
}

/* -------------------------------------------------------------------------
   Tooltip (for packet hover)
   ------------------------------------------------------------------------- */
.packet[title] {
  cursor: help;
}

/* -------------------------------------------------------------------------
   Modals
   ------------------------------------------------------------------------- */
.modal {
  position: fixed;
  top: 0; left: 0; width: 100vw; height: 100vh;
  background: rgba(6, 9, 16, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 500px;
}

/* -------------------------------------------------------------------------
   Responsive
   ------------------------------------------------------------------------- */
@media (max-width: 600px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-meta {
    width: 100%;
    justify-content: space-between;
  }

  .file-info-grid {
    grid-template-columns: 1fr 1fr;
  }

  .upload-controls {
    flex-direction: column;
  }

  .btn { width: 100%; justify-content: center; }
}

/* -------------------------------------------------------------------------
   Completion overlay ring
   ------------------------------------------------------------------------- */
@keyframes complete-ring-expand {
  from { transform: scale(0.8); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.complete-ring {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.12);
  border: 2px solid var(--success);
  animation: complete-ring-expand 400ms ease-out forwards;
  margin: var(--space-4) auto;
}