:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --border-color: rgba(148, 163, 184, 0.15);
  --border-color-hover: rgba(148, 163, 184, 0.25);
  
  --accent-blue: #3b82f6;
  --accent-blue-dark: #2563eb;
  --accent-purple: #8b5cf6;
  --accent-cyan: #06b6d4;
  
  --success: #10b981;
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --danger-border: rgba(239, 68, 68, 0.2);
}

/* ==================== Global ==================== */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

/* ==================== Tailwind Replacements for Offline ==================== */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.py-10 {
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
}

.py-12 {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.px-4 {
  padding-left: 1rem;
  padding-right: 1rem;
}

.px-6 {
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.border-b {
  border-bottom-width: 1px;
}

.border-white\/10 {
  border-color: rgba(255, 255, 255, 0.1);
}

.max-w-sm {
  max-width: 24rem;
}

.max-w-md {
  max-width: 28rem;
}

.max-w-2xl {
  max-width: 42rem;
}

.max-w-3xl {
  max-width: 48rem;
}

.max-w-4xl {
  max-width: 56rem;
}

.max-w-5xl {
  max-width: 64rem;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.mb-6 {
  margin-bottom: 1.5rem;
}

.mb-8 {
  margin-bottom: 2rem;
}

.mb-10 {
  margin-bottom: 2.5rem;
}

.w-full {
  width: 100%;
}

.text-4xl {
  font-size: 2.25rem;
  line-height: 2.5rem;
}

.text-5xl {
  font-size: 3rem;
  line-height: 1;
}

.text-2xl {
  font-size: 1.5rem;
  line-height: 2rem;
}

.text-base {
  font-size: 1rem;
  line-height: 1.5rem;
}

.text-lg {
  font-size: 1.125rem;
  line-height: 1.75rem;
}

.text-sm {
  font-size: 0.875rem;
  line-height: 1.25rem;
}

.text-xs {
  font-size: 0.75rem;
  line-height: 1rem;
}

.font-bold {
  font-weight: 700;
}

.font-semibold {
  font-weight: 600;
}

.leading-tight {
  line-height: 1.25;
}

.leading-relaxed {
  line-height: 1.625;
}

.mb-3 {
  margin-bottom: 0.75rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-1 {
  margin-bottom: 0.25rem;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-primary);
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  display: block;
}

/* ==================== Layout Container ==================== */
header,
main {
  display: block;
  box-sizing: border-box;
}

header {
  width: 100%;
  background: rgba(15, 23, 42, 0.5);
  border-color: var(--border-color);
  padding: 2.5rem 1rem;
  margin: 0;
}

main {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1rem;
  box-sizing: border-box;
}
.back-button {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.5rem 0.875rem;
  border-radius: 0.5rem;
  background: rgba(59, 130, 246, 0.1);
  color: var(--text-primary);
  text-decoration: none;
  z-index: 9999;
  font-weight: 600;
  font-size: 0.875rem;
  font-family: inherit;
  border: 1px solid rgba(59, 130, 246, 0.2);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.back-button:hover {
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

/* ==================== Header Styling ==================== */
header > div {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

header h1 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem 0;
}

header p {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 400;
  margin: 0;
}

/* ==================== Cards ==================== */
.card {
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 2rem 1.5rem;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.card > div:first-child {
  text-align: center;
  margin-bottom: 1.5rem;
  width: 100%;
}

.card:hover {
  border-color: var(--border-color-hover);
  background: rgba(30, 41, 59, 0.5);
}

/* ==================== Sections ==================== */
section {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

section.text-center {
  text-align: center;
}

section.card {
  align-items: stretch;
}
input,
select {
  width: 100%;
  color: var(--text-primary);
  background: rgba(51, 65, 85, 0.3);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: 0.5rem;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  font-family: inherit;
  display: block;
}

/* Centered Input Containers */
[class*="max-w-s"] {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

div:has(> input),
div:has(> select),
div:has(> label:first-child + input),
div:has(> label:first-child + select) {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
}

label {
  display: block;
  text-align: left;
  width: 100%;
}

input.input-small {
  padding: 0.5rem;
  font-size: 0.875rem;
}

input::placeholder,
select {
  color: var(--text-muted);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: rgba(51, 65, 85, 0.4);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Improved Select Styling */
select {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='rgb(148,163,184)' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
  padding-right: 2.5rem;
  cursor: pointer;
}

select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.75rem;
}

select option:hover {
  background: var(--accent-blue);
  color: white;
}

/* ==================== Buttons ==================== */
.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1rem;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(59, 130, 246, 0.2);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-block;
  background: rgba(59, 130, 246, 0.15);
  color: var(--text-primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.25);
  border-color: rgba(59, 130, 246, 0.5);
  transform: translateY(-1px);
}

/* ==================== Results Section ==================== */
#results {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-sizing: border-box;
}

#results > div {
  width: 100%;
  text-align: center;
  box-sizing: border-box;
}

#results > div:first-child {
  margin-bottom: 2rem;
}

#results section {
  width: 100%;
  box-sizing: border-box;
}

#metricsPanel {
  width: 100%;
  box-sizing: border-box;
}

/* ==================== Main Content Wrapper ==================== */
main > section,
main > div {
  width: 100%;
  box-sizing: border-box;
}

/* ==================== Error Message ==================== */
#errorMessage {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  border-radius: 0.5rem;
  padding: 1rem;
  width: 100%;
  margin: 0 auto 2rem auto;
  max-width: 100%;
}

#errorMessage h3,
#errorMessage p {
  margin: 0;
}

#errorText {
  color: rgba(239, 68, 68, 0.9);
}

/* ==================== Process Cards ==================== */
#processFormContainer {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 2rem;
}

#processFormContainer > div:first-child {
  text-align: center;
  margin-bottom: 1.5rem;
  width: 100%;
}

.process-card {
  background: rgba(51, 65, 85, 0.25);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.25rem;
  transition: all 0.2s ease;
  width: 100%;
}

.process-card:hover {
  border-color: var(--border-color-hover);
  background: rgba(51, 65, 85, 0.35);
}

.process-card h3 {
  margin: 0 0 1rem 0;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
}

.process-card input {
  margin-bottom: 0.5rem;
}

/* ==================== Sections ==================== */
section {
  display: flex;
  flex-direction: column;
  align-items: center;
}

section.text-center {
  text-align: center;
}

/* ==================== Metrics Cards ==================== */
.metric-card {
  background: rgba(51, 65, 85, 0.25);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 140px;
}

.metric-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-2px);
  background: rgba(51, 65, 85, 0.35);
}

.metric-card > div:first-child {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 0.5rem;
}

.metric-card > div:last-child {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

/* ==================== Tables ==================== */
table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(51, 65, 85, 0.15);
  border-radius: 0.5rem;
  overflow: hidden;
}

thead {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
}

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 0.875rem 1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
}

tbody tr:hover {
  background: rgba(59, 130, 246, 0.1);
}

/* ==================== Gantt Chart ==================== */
#ganttChart {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  background: rgba(15, 23, 42, 0.3) !important;
  padding: 2rem !important;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color) !important;
}

.gantt-timeline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 1rem;
  background: rgba(51, 65, 85, 0.15);
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
}

.gantt-block {
  min-height: 48px;
  min-width: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  color: white;
  border-radius: 0.375rem;
  margin-right: 0.5rem;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  text-align: center;
  padding: 0.5rem;
  flex-shrink: 0;
}

.gantt-block:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.gantt-timing {
  font-size: 0.65rem;
  opacity: 0.8;
  margin-top: 0.25rem;
}

/* Process Colors */
.process-color-0 {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.process-color-1 {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.process-color-2 {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

.process-color-3 {
  background: linear-gradient(135deg, #ec4899, #db2777);
}

.process-color-4 {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.process-color-5 {
  background: linear-gradient(135deg, #10b981, #059669);
}

.process-color-6 {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.process-color-7 {
  background: linear-gradient(135deg, #14b8a6, #0f766e);
}

.process-color-8 {
  background: linear-gradient(135deg, #84cc16, #65a30d);
}

.process-color-9 {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
}

.idle-block {
  background: repeating-linear-gradient(
    45deg,
    #475569,
    #475569 8px,
    #64748b 8px,
    #64748b 16px
  );
  color: #cbd5e1;
  font-style: italic;
}

/* ==================== Loading Spinner ==================== */
.loading-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ==================== Animations ==================== */
.fade-in {
  animation: fadeIn 0.4s ease-out;
}

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

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  header {
    padding: 2rem 1rem;
  }

  header h1 {
    font-size: 1.75rem;
  }

  header p {
    font-size: 0.95rem;
  }

  main {
    padding: 1.5rem 1rem;
  }

  .card {
    padding: 1.5rem 1rem;
    margin-bottom: 1.5rem;
  }

  .card > div:first-child {
    margin-bottom: 1.25rem;
  }

  th,
  td {
    padding: 0.75rem 0.5rem;
    font-size: 0.8rem;
  }

  .metric-card {
    padding: 1rem;
    min-height: 120px;
  }

  .gantt-block {
    min-height: 40px;
    font-size: 0.75rem;
  }

  input,
  select {
    font-size: 16px;
  }

  section {
    align-items: center;
  }
}

@media (max-width: 480px) {
  header {
    padding: 1.5rem 1rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  header p {
    font-size: 0.9rem;
  }

  main {
    padding: 1rem 0.75rem;
  }

  .card {
    padding: 1.25rem 1rem;
    margin-bottom: 1.25rem;
  }

  .card > div:first-child {
    margin-bottom: 1rem;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  table {
    font-size: 0.8rem;
  }

  th,
  td {
    padding: 0.5rem;
  }
}