/* CSS RESET & VARIABLES */
:root {
  --primary-color: #0284c7;
  --primary-hover: #0369a1;
  --secondary-color: #0f172a;
  --sealing-color: #0284c7;
  --sealing-hover: #0369a1;
  --pvc-color: #0d9488;
  --pvc-hover: #0f766e;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --success-color: #16a34a;
  --warning-color: #d97706;
  --error-color: #dc2626;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

* {
  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;
  padding: 0;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 16px;
  width: 100%;
  flex: 1;
}

/* HEADER */
header.app-header {
  background-color: #ffffff;
  border-bottom: 2px solid var(--border-color);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

header.app-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--secondary-color);
  letter-spacing: -0.5px;
  text-transform: uppercase;
}

header.app-header .subtitle {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-top: 4px;
  letter-spacing: 1px;
}

/* CARDS */
.card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 2px solid #f1f5f9;
  padding-bottom: 10px;
}

.card-title svg {
  width: 24px;
  height: 24px;
  fill: var(--primary-color);
}

/* HOW IT WORKS */
.steps-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
}

.step-item {
  flex: 1 1 120px;
  background-color: #f1f5f9;
  padding: 12px 10px;
  border-radius: 8px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--secondary-color);
  border: 1px solid #e2e8f0;
}

.step-num {
  display: inline-block;
  background-color: var(--primary-color);
  color: #fff;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 0.75rem;
  line-height: 22px;
  margin-bottom: 4px;
}

/* AI SELECTION GRID */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
}

.ai-card {
  background-color: #ffffff;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.ai-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.ai-card.selected {
  border-color: var(--primary-color);
  background-color: #f0f9ff;
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.2);
}

.ai-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-icon svg {
  width: 32px;
  height: 32px;
}

.ai-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--secondary-color);
}

.ai-selected-badge {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--primary-color);
  text-transform: uppercase;
  display: none;
}

.ai-card.selected .ai-selected-badge {
  display: block;
}

/* TYPE BUTTONS */
.type-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .type-grid {
    grid-template-columns: 1fr;
  }
}

.btn-type {
  background-color: #ffffff;
  border: 3px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: all 0.25s ease;
  min-height: 140px;
  user-select: none;
}

.btn-type-sealing {
  border-color: var(--sealing-color);
  color: var(--sealing-color);
}

.btn-type-sealing:hover {
  background-color: var(--sealing-color);
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-type-sealing.selected {
  background-color: var(--sealing-color);
  color: #ffffff;
  box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.3);
}

.btn-type-pvc {
  border-color: var(--pvc-color);
  color: var(--pvc-color);
}

.btn-type-pvc:hover {
  background-color: var(--pvc-color);
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-type-pvc.selected {
  background-color: var(--pvc-color);
  color: #ffffff;
  box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.3);
}

.btn-type svg {
  width: 44px;
  height: 44px;
  fill: currentColor;
}

.btn-type .btn-text {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
}

.btn-type .btn-sub {
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0.9;
}

/* PROMPT DISPLAY AREA */
.prompt-box {
  width: 100%;
  height: 220px;
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #334155;
  resize: vertical;
  outline: none;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.file-info-box {
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 12px 16px;
  margin-top: 14px;
  font-size: 0.95rem;
  color: #166534;
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-info-box strong {
  font-family: var(--font-mono);
  background: #dcfce7;
  padding: 2px 6px;
  border-radius: 4px;
  word-break: break-all;
}

/* ACTION BUTTONS */
.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.btn {
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s ease;
  user-select: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
  flex: 1;
  min-width: 180px;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-success {
  background-color: var(--success-color);
  color: #ffffff;
  flex: 2;
  min-width: 220px;
}

.btn-success:hover {
  background-color: #15803d;
  box-shadow: var(--shadow-md);
}

.btn-danger {
  background-color: #ef4444;
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* STATUS BANNER */
.status-card {
  background-color: #e0f2fe;
  border: 1px solid #bae6fd;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.status-icon {
  width: 28px;
  height: 28px;
  fill: var(--primary-color);
  flex-shrink: 0;
}

.status-text {
  font-size: 1rem;
  font-weight: 600;
  color: #0369a1;
}

/* LAST OPERATION TABLE */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.info-item {
  background-color: #f8fafc;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}

.info-item .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
}

.info-item .val {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin-top: 2px;
  word-break: break-all;
}

/* FOOTER */
footer.app-footer {
  background-color: var(--secondary-color);
  color: #ffffff;
  text-align: center;
  padding: 20px 16px;
  margin-top: auto;
}

footer.app-footer .brand {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: #38bdf8;
}

footer.app-footer .desc {
  font-size: 0.85rem;
  color: #94a3b8;
  margin-top: 4px;
}

/* ALERT NOTIFICATION */
.toast-notification {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--secondary-color);
  color: #ffffff;
  padding: 14px 20px;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toast-notification.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-notification.success {
  border-left: 5px solid var(--success-color);
}

.toast-notification.warning {
  border-left: 5px solid var(--warning-color);
}

.toast-notification.error {
  border-left: 5px solid var(--error-color);
}