/* ============================================================================
   public\css\theme.css
   Dark (default) + Light "Porcelain" theme
   Apply to <html data-theme="dark"> or <html data-theme="light">
   ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600;700;800&family=DM+Mono:wght@400;500&display=swap');

/* ============================================================================
   DARK THEME (default — unchanged glamour)
   ============================================================================ */
[data-theme="dark"],
:root {
  /* Backgrounds */
  --bg-root:       linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --bg-nav:        rgba(15, 23, 42, 0.85);
  --bg-card:       rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-input:      rgba(255, 255, 255, 0.06);
  --bg-input-focus:rgba(255, 255, 255, 0.10);
  --bg-modal:      #1e293b;
  --bg-code:       rgba(0, 0, 0, 0.4);
  --bg-badge:      rgba(255, 255, 255, 0.06);
  --bg-tab-active: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --bg-empty:      rgba(255, 255, 255, 0.03);

  /* Borders */
  --border:        rgba(255, 255, 255, 0.10);
  --border-hover:  rgba(59, 130, 246, 0.50);
  --border-focus:  #3b82f6;
  --border-modal:  rgba(255, 255, 255, 0.10);

  /* Text */
  --text-primary:   #f1f5f9;
  --text-secondary: rgba(255, 255, 255, 0.60);
  --text-muted:     rgba(255, 255, 255, 0.35);
  --text-heading:   #ffffff;
  --text-label:     rgba(255, 255, 255, 0.90);
  --text-code:      #e5e7eb;
  --text-placeholder: rgba(255, 255, 255, 0.30);

  /* Accent */
  --accent:        #3b82f6;
  --accent-2:      #8b5cf6;
  --accent-grad:   linear-gradient(135deg, #3b82f6, #8b5cf6);
  --accent-glow:   rgba(59, 130, 246, 0.30);
  --accent-subtle: rgba(59, 130, 246, 0.12);

  /* Status */
  --status-online:  #10b981;
  --status-offline: #ef4444;
  --color-success:  #22c55e;
  --color-danger:   #ef4444;
  --color-warning:  #eab308;

  /* Shadows */
  --shadow-card:  0 4px 20px rgba(0, 0, 0, 0.25);
  --shadow-hover: 0 10px 40px rgba(59, 130, 246, 0.20);
  --shadow-modal: 0 20px 60px rgba(0, 0, 0, 0.55);
  --shadow-nav:   0 2px 20px rgba(0, 0, 0, 0.30);
  --shadow-btn:   0 4px 15px rgba(59, 130, 246, 0.30);

  /* Components */
  --radius-card:  16px;
  --radius-btn:   10px;
  --radius-input: 10px;
  --radius-badge: 20px;

  /* Scrollbar */
  --scrollbar-track: rgba(255, 255, 255, 0.04);
  --scrollbar-thumb: rgba(59, 130, 246, 0.50);

  /* Nav backdrop */
  --nav-blur: blur(12px);

  /* Select arrow */
  --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='rgba(255,255,255,0.5)' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
}

/* ============================================================================
   LIGHT THEME — "Porcelain"
   Warm off-white, deep slate ink, sharp indigo accents
   ============================================================================ */
[data-theme="light"] {
  /* Backgrounds */
  --bg-root:        linear-gradient(145deg, #f0f4ff 0%, #fafbff 40%, #f5f0ff 100%);
  --bg-nav:         rgba(255, 255, 255, 0.88);
  --bg-card:        rgba(255, 255, 255, 0.85);
  --bg-card-hover:  rgba(255, 255, 255, 1.00);
  --bg-input:       rgba(241, 245, 255, 0.80);
  --bg-input-focus: rgba(238, 242, 255, 1.00);
  --bg-modal:       #ffffff;
  --bg-code:        #f1f5f9;
  --bg-badge:       rgba(99, 102, 241, 0.07);
  --bg-tab-active:  linear-gradient(135deg, #4f46e5, #7c3aed);
  --bg-empty:       rgba(99, 102, 241, 0.03);

  /* Borders */
  --border:         rgba(99, 102, 241, 0.13);
  --border-hover:   rgba(79, 70, 229, 0.40);
  --border-focus:   #4f46e5;
  --border-modal:   rgba(99, 102, 241, 0.12);

  /* Text */
  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;
  --text-heading:   #0f172a;
  --text-label:     #1e293b;
  --text-code:      #1e293b;
  --text-placeholder: #94a3b8;

  /* Accent */
  --accent:         #4f46e5;
  --accent-2:       #7c3aed;
  --accent-grad:    linear-gradient(135deg, #4f46e5, #7c3aed);
  --accent-glow:    rgba(79, 70, 229, 0.18);
  --accent-subtle:  rgba(79, 70, 229, 0.08);

  /* Status */
  --status-online:  #059669;
  --status-offline: #dc2626;
  --color-success:  #16a34a;
  --color-danger:   #dc2626;
  --color-warning:  #d97706;

  /* Shadows — soft, layered, warm */
  --shadow-card:  0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 16px rgba(99, 102, 241, 0.08);
  --shadow-hover: 0 4px 24px rgba(79, 70, 229, 0.16), 0 1px 4px rgba(15,23,42,0.08);
  --shadow-modal: 0 8px 40px rgba(15, 23, 42, 0.18), 0 2px 8px rgba(15,23,42,0.08);
  --shadow-nav:   0 1px 0 rgba(99, 102, 241, 0.10), 0 2px 16px rgba(15,23,42,0.07);
  --shadow-btn:   0 4px 12px rgba(79, 70, 229, 0.28);

  /* Scrollbar */
  --scrollbar-track: rgba(99, 102, 241, 0.06);
  --scrollbar-thumb: rgba(79, 70, 229, 0.35);

  /* Select arrow */
  --select-arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='rgba(79,70,229,0.6)' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
}

/* ============================================================================
   GLOBAL BASE — uses CSS variables for both themes
   ============================================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg-root);
  min-height: 100vh;
  color: var(--text-primary);
  transition: background 0.35s ease, color 0.25s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
}

code, pre, .font-mono {
  font-family: 'DM Mono', 'Courier New', monospace;
}

/* ============================================================================
   NAVIGATION
   ============================================================================ */
.topnav {
  background: var(--bg-nav);
  backdrop-filter: var(--nav-blur);
  -webkit-backdrop-filter: var(--nav-blur);
  box-shadow: var(--shadow-nav);
  border-bottom: 1px solid var(--border);
  padding: 16px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.35s ease, box-shadow 0.35s ease;
}

.logo {
  font-size: 1.45em;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.3px;
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 12px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9em;
  transition: background 0.25s;
}

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent-grad);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85em;
  color: white;
  flex-shrink: 0;
}

.nav-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

/* ============================================================================
   BUTTONS
   ============================================================================ */
.btn {
  padding: 10px 22px;
  border-radius: var(--radius-btn);
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.9em;
  font-family: 'DM Sans', sans-serif;
  transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  letter-spacing: 0.1px;
}

.btn-primary {
  background: var(--accent-grad);
  color: white;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* ============================================================================
   CONTAINER
   ============================================================================ */
.container {
  max-width: 1400px;
  margin: 28px auto;
  padding: 0 5%;
}

/* ============================================================================
   STAT CARDS
   ============================================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 26px;
  display: flex;
  align-items: center;
  gap: 18px;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
  backdrop-filter: blur(8px);
}

.stat-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}

.stat-icon {
  font-size: 2.2em;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-grad);
  border-radius: 14px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.stat-info h3 {
  font-size: 2em;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
  line-height: 1;
}

.stat-info p {
  color: var(--text-secondary);
  font-size: 0.9em;
  font-weight: 500;
}

/* ============================================================================
   SECTION HEADERS
   ============================================================================ */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.section-header h2 {
  font-size: 1.6em;
  color: var(--text-heading);
  font-weight: 700;
}

/* ============================================================================
   PROJECT CARDS
   ============================================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 22px;
  margin-bottom: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 22px;
  box-shadow: var(--shadow-card);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  backdrop-filter: blur(8px);
  animation: slideUp 0.4s ease-out both;
}

.project-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
}

.project-name {
  font-size: 1.3em;
  font-weight: 700;
  margin: 10px 0 6px;
  color: var(--text-heading);
}

.project-id {
  color: var(--text-muted);
  font-size: 0.82em;
  margin-bottom: 14px;
  font-family: 'DM Mono', monospace;
}

.project-stats {
  display: flex;
  gap: 14px;
  margin: 16px 0;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.project-stat { flex: 1; text-align: center; }

.project-stat-value {
  font-size: 1.7em;
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 3px;
}

.project-stat-label {
  font-size: 0.68em;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 700;
}

.project-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  margin-top: 16px;
}

.project-btn {
  padding: 11px;
  border-radius: 9px;
  border: none;
  font-weight: 700;
  font-size: 0.85em;
  cursor: pointer;
  transition: all 0.22s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  font-family: 'DM Sans', sans-serif;
}

.project-btn-control {
  background: var(--accent-grad);
  color: white;
  box-shadow: var(--shadow-btn);
}

.project-btn-control:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.project-btn-monitor {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.project-btn-monitor:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.project-menu-btn {
  background: var(--bg-badge);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  grid-column: 1 / -1;
}

.project-menu-btn:hover {
  background: var(--accent-subtle);
  border-color: var(--border-hover);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Status badges */
.project-status, .status-online, .status-offline {
  padding: 5px 12px;
  border-radius: var(--radius-badge);
  font-size: 0.72em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-online {
  background: rgba(16, 185, 129, 0.12);
  color: var(--status-online);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.status-offline {
  background: rgba(239, 68, 68, 0.10);
  color: var(--status-offline);
  border: 1px solid rgba(239, 68, 68, 0.20);
}

/* ============================================================================
   FORMS & INPUTS
   ============================================================================ */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 7px;
  font-weight: 700;
  color: var(--text-label);
  font-size: 0.88em;
  letter-spacing: 0.1px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-size: 0.95em;
  font-family: 'DM Sans', sans-serif;
  transition: all 0.2s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-placeholder);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.form-group textarea {
  resize: vertical;
  min-height: 90px;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: var(--select-arrow);
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-group select option {
  background: var(--bg-modal);
  color: var(--text-primary);
}

/* ============================================================================
   MODALS
   ============================================================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.60);
  backdrop-filter: blur(6px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

[data-theme="light"] .modal {
  background: rgba(15, 23, 42, 0.40);
}

.modal.show,
.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-modal);
  border-radius: 20px;
  padding: 30px;
  max-width: 680px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--border-modal);
  box-shadow: var(--shadow-modal);
  transition: background 0.3s ease;
  animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(-20px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 1.35em;
  color: var(--text-heading);
  font-weight: 700;
}

.close-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.3em;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.close-btn:hover {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--color-danger);
  transform: rotate(90deg);
}

/* ============================================================================
   TABS
   ============================================================================ */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 0;
}

.tab {
  flex: 1;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  background: transparent;
  border: none;
  font-size: 1em;
  font-weight: 700;
  color: var(--text-muted);
  transition: all 0.2s ease;
  font-family: 'DM Sans', sans-serif;
}

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

.tab.active {
  color: var(--accent);
  border-bottom: 3px solid var(--accent);
  margin-bottom: -2px;
}

/* ============================================================================
   MESSAGES
   ============================================================================ */
.message, .error-message, .success-message {
  padding: 13px 16px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.9em;
  font-weight: 500;
  display: none;
  animation: slideDown 0.3s ease;
}

.message.show,
.error-message.show,
.success-message.show { display: block; }

.message.error, .error-message {
  background: rgba(239, 68, 68, 0.10);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.message.success, .success-message {
  background: rgba(34, 197, 94, 0.10);
  color: var(--color-success);
  border: 1px solid rgba(34, 197, 94, 0.25);
}

/* ============================================================================
   CODE BLOCKS
   ============================================================================ */
.code-block {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  padding-top: 46px;
  margin: 10px 0;
}

.code-block pre {
  margin: 0;
  color: var(--text-code);
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: 0.88em;
  line-height: 1.65;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--accent-grad);
  color: white;
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8em;
  font-weight: 700;
  transition: all 0.2s ease;
}

.copy-btn:hover { filter: brightness(1.1); transform: scale(1.04); }
.copy-btn.copied { background: linear-gradient(135deg, #22c55e, #16a34a); }

/* ============================================================================
   TABLES
   ============================================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  background: var(--bg-badge);
  padding: 12px 14px;
  text-align: left;
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.82em;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  border-bottom: 2px solid var(--border);
}

.data-table td {
  padding: 12px 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  font-size: 0.9em;
}

.data-table tr:hover td {
  background: var(--accent-subtle);
}

/* ============================================================================
   DATA/CHART CARDS
   ============================================================================ */
.data-card,
.chart-section,
.ml-section,
.export-section,
.header-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 26px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.chart-header,
.ml-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
  flex-wrap: wrap;
  gap: 14px;
}

.chart-header h3,
.ml-header h3,
.data-card h3,
.export-section h3 {
  font-size: 1.3em;
  color: var(--text-heading);
  font-weight: 700;
}

/* ============================================================================
   CHART CONTROLS
   ============================================================================ */
.chart-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chart-controls select,
.chart-controls button {
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.88em;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: 'DM Sans', sans-serif;
  appearance: none;
  background-image: var(--select-arrow);
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

.chart-controls select:focus,
.chart-controls button:focus {
  outline: none;
  border-color: var(--border-focus);
}

.chart-controls select option {
  background: var(--bg-modal);
  color: var(--text-primary);
}

/* ============================================================================
   EMPTY STATE
   ============================================================================ */
.empty-state {
  text-align: center;
  padding: 56px 20px;
  color: var(--text-muted);
  font-size: 1em;
  background: var(--bg-empty);
  border-radius: var(--radius-card);
  border: 2px dashed var(--border);
}

/* ============================================================================
   LOADING / SPINNER
   ============================================================================ */
.loading {
  text-align: center;
  padding: 48px;
  color: var(--text-muted);
}

.spinner {
  border: 3px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 50%;
  width: 42px;
  height: 42px;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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

/* ============================================================================
   TOAST
   ============================================================================ */
.toast {
  position: fixed;
  bottom: 22px;
  right: 22px;
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.9em;
  color: white;
  z-index: 9999;
  animation: toastIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.toast.success { background: linear-gradient(135deg, #22c55e, #16a34a); }
.toast.error   { background: linear-gradient(135deg, #ef4444, #dc2626); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(50px) scale(0.9); }
  to   { opacity: 1; transform: translateX(0)    scale(1); }
}

/* ============================================================================
   THEME TOGGLE BUTTON
   ============================================================================ */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  background: var(--accent-subtle);
  border-color: var(--border-hover);
  color: var(--accent);
  transform: rotate(20deg) scale(1.1);
}

/* ============================================================================
   LIGHT THEME SPECIFIC OVERRIDES
   ============================================================================ */

/* Light theme adds a subtle mesh background */
[data-theme="light"] body {
  background-attachment: fixed;
}

[data-theme="light"] body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 15% 50%, rgba(79, 70, 229, 0.07) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 20%, rgba(124, 58, 237, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 90%, rgba(99, 102, 241, 0.05) 0%, transparent 55%);
  pointer-events: none;
  z-index: -1;
}

/* Stronger card borders in light */
[data-theme="light"] .project-card,
[data-theme="light"] .stat-card,
[data-theme="light"] .data-card,
[data-theme="light"] .chart-section,
[data-theme="light"] .header-section {
  border-color: rgba(99, 102, 241, 0.14);
}

/* Darker text on project cards */
[data-theme="light"] .project-id {
  color: #64748b;
}

/* Nav bottom border more visible in light */
[data-theme="light"] .topnav {
  border-bottom-color: rgba(99, 102, 241, 0.14);
}

/* Latest data pre in light */
[data-theme="light"] .latest-data {
  background: #f8fafc;
  border-color: rgba(99, 102, 241, 0.12);
  color: #1e293b;
}

/* Input shadows in light */
[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group select:focus,
[data-theme="light"] .form-group textarea:focus {
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.10);
}

/* ============================================================================
   SCROLLBARS
   ============================================================================ */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { filter: brightness(1.2); }

/* ============================================================================
   ANIMATIONS
   ============================================================================ */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: 1fr; }
  .section-header,
  .chart-header,
  .ml-header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .user-info span { display: none; }
  .modal-content { padding: 22px; }
  .project-actions { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .container { padding: 0 4%; margin: 16px auto; }
}