/* Modern Design System for Crontab Simulator */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Color Palette - Modern Dark Theme */
  --bg-color: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.25);

  --success-bg: rgba(16, 185, 129, 0.15);
  --success-border: rgba(16, 185, 129, 0.3);
  --success-text: #34d399;

  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-border: rgba(239, 68, 68, 0.3);
  --danger-text: #f87171;

  --warning-bg: rgba(245, 158, 11, 0.15);
  --warning-border: rgba(245, 158, 11, 0.3);
  --warning-text: #fbbf24;

  --info-bg: rgba(59, 130, 246, 0.15);
  --info-border: rgba(59, 130, 246, 0.3);
  --info-text: #60a5fa;

  --input-bg: rgba(15, 23, 42, 0.6);
  --input-border: rgba(255, 255, 255, 0.12);
  --input-focus: #6366f1;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

[data-theme="light"] {
  --bg-color: #f1f5f9;
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 0, 0, 0.08);
  --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --input-bg: #ffffff;
  --input-border: #cbd5e1;

  --success-bg: rgba(16, 185, 129, 0.1);
  --success-text: #059669;

  --danger-bg: rgba(239, 68, 68, 0.1);
  --danger-text: #dc2626;

  --warning-bg: rgba(245, 158, 11, 0.1);
  --warning-text: #d97706;

  --info-bg: rgba(59, 130, 246, 0.1);
  --info-text: #2563eb;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  padding: 2rem 1rem;
  transition: background-color 0.3s ease, color 0.3s ease;
  background-image: 
    radial-gradient(at 10% 10%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
    radial-gradient(at 90% 90%, rgba(16, 185, 129, 0.05) 0px, transparent 50%);
  background-attachment: fixed;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Header Section */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--card-border);
  flex-wrap: wrap;
  gap: 1rem;
}

.header-title-group h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-title-group p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

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

.theme-toggle-btn {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px var(--accent-glow);
}

/* Main Layout Grid */
.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* Glassmorphism Card Style */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.card-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-btn-group {
  display: flex;
  gap: 0.5rem;
}

.preset-btn-accent {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #818cf8;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-btn-accent:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #ffffff;
}

.preset-btn-outline {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-btn-outline:hover {
  border-color: var(--danger-text);
  color: var(--danger-text);
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.label-hint {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
}

textarea.input-textarea {
  width: 100%;
  min-height: 180px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 1rem;
  line-height: 1.5;
  resize: vertical;
  transition: all 0.2s ease;
}

textarea.input-textarea:focus,
input[type="datetime-local"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Quick Presets Bar */
.presets-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  align-items: center;
}

.presets-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-right: 0.25rem;
}

.preset-chip {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-chip:hover {
  background: var(--accent-glow);
  color: var(--text-main);
  border-color: var(--accent-primary);
}

/* Date Range Controls Grid */
.date-range-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

input[type="datetime-local"],
input[type="number"],
select {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  transition: all 0.2s ease;
}

/* Quick Range Shortcut Chips */
.range-shortcuts {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.shortcut-btn {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.shortcut-btn:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Action Area & Run Button */
.action-area {
  display: flex;
  justify-content: flex-end;
  margin-top: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary) 0%, #4f46e5 100%);
  color: #ffffff;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.85rem 2.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  box-shadow: 0 4px 15px var(--accent-glow);
  transition: all 0.2s ease;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 0.8s linear infinite;
  display: none;
}

.btn-primary.loading .spinner {
  display: inline-block;
}

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

/* Alert Banner */
.alert-banner {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.alert-banner.info-style {
  background: var(--info-bg);
  border-color: var(--info-border);
  color: var(--info-text);
}

.alert-banner.hidden {
  display: none;
}

/* Results Summary Dashboard */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.summary-card {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.summary-card .val {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
}

.summary-card .lbl {
  font-size: 0.825rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

.summary-card.total .val { color: var(--text-main); }
.summary-card.valid .val { color: var(--success-text); }
.summary-card.invalid .val { color: var(--danger-text); }
.summary-card.runs .val { color: #c084fc; }

/* Filter & Table Toolbar */
.table-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.table-filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn.active,
.filter-btn:hover {
  background: var(--card-border);
  color: var(--text-main);
  border-color: var(--input-focus);
}

/* Results Table */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
}

table.results-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

table.results-table th {
  background: rgba(15, 23, 42, 0.8);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--card-border);
  white-space: nowrap;
}

table.results-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--card-border);
  vertical-align: middle;
}

table.results-table tbody tr:last-child td {
  border-bottom: none;
}

table.results-table tbody tr {
  transition: background-color 0.15s ease;
}

table.results-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Status-based Row Styling */
table.results-table tr.row-valid {
  border-left: 3px solid var(--success-text);
}

table.results-table tr.row-invalid {
  border-left: 3px solid var(--danger-text);
  background-color: rgba(239, 68, 68, 0.03);
}

table.results-table tr.row-truncated {
  border-left: 3px solid var(--warning-text);
  background-color: rgba(245, 158, 11, 0.03);
}

/* Badges & Elements inside Table */
.code-badge {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--card-border);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  color: #38bdf8;
  display: inline-block;
}

.label-subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  display: block;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.775rem;
  font-weight: 600;
  text-transform: capitalize;
}

.status-badge.valid {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.status-badge.invalid {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
}

.status-badge.truncated {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
}

.btn-show-runs {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: #818cf8;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-top: 0.4rem;
  display: inline-block;
  transition: all 0.2s ease;
}

.btn-show-runs:hover {
  background: rgba(99, 102, 241, 0.25);
  color: #ffffff;
}

.count-pill {
  font-weight: 700;
  font-size: 1rem;
}

.error-msg {
  color: var(--danger-text);
  font-size: 0.825rem;
  margin-top: 0.35rem;
  max-width: 320px;
  line-height: 1.4;
}

/* Modal for Execution Times */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 1rem;
}

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

.modal-content {
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 550px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--card-shadow);
  padding: 1.5rem;
}

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

}

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 600;

}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.modal-subhead {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.modal-body {
  overflow-y: auto;
  max-height: 50vh;
  padding-right: 0.5rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem 1.5rem;
}

.runs-list {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #38bdf8;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.runs-list li {
  padding: 0.2rem 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* Help Section */
.help-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.help-box {
  background: rgba(15, 23, 42, 0.3);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.help-box h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.help-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.875rem;
}

.help-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.help-list code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.3);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  color: #38bdf8;
  font-size: 0.825rem;
}

.semantics-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Footer */
footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 2rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  body { padding: 1rem 0.5rem; }
  .header-title-group h1 { font-size: 1.5rem; }
  .card { padding: 1.25rem; }
  .action-area { width: 100%; }
  .btn-primary { width: 100%; }
}