/* ========================================
   KROB Assistant - Design System
   iOS-Inspired Clean UI
   ======================================== */

:root {
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F5F5F7;
  --color-text: #1D1D1F;
  --color-text-secondary: #86868B;
  --color-accent: #1A9BA0;
  --color-accent-hover: #168388;
  --color-success: #34C759;
  --color-error: #FF3B30;
  --color-border: #D2D2D7;
  --color-card-shadow: rgba(0, 0, 0, 0.08);
  --color-code-bg: #1D1D1F;
  --color-code-text: #F5F5F7;
  --radius: 12px;
  --radius-sm: 10px;
  --radius-lg: 16px;
  --transition: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
  --max-width: 680px;
}

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

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ========================================
   Screen System
   ======================================== */

.screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(24px);
  transition: opacity var(--transition), transform var(--transition), visibility 0s 0.35s;
  padding: 40px 20px 60px;
}

.screen.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity var(--transition), transform var(--transition), visibility 0s 0s;
}

.screen.exit {
  opacity: 0;
  transform: translateY(-24px);
}

.container {
  width: 100%;
  max-width: var(--max-width);
}

/* ========================================
   Landing Page
   ======================================== */

.landing-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: 40px;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 0;
}

.brand-avatar {
  width: 104px;
  height: 104px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
  border: 3px solid var(--color-border);
}

.brand-krob {
  font-family: 'Montserrat', 'Inter', sans-serif;
  font-weight: 900;
  font-size: 2.6rem;
  color: var(--color-accent);
  letter-spacing: -0.05em;
}

.landing-title {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-top: 8px;
  line-height: 1.15;
}

.free-badge {
  display: inline-block;
  margin-top: 12px;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #1a7a2e;
  background: rgba(52, 199, 89, 0.12);
  border-radius: 8px;
}

.landing-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 480px;
  margin-top: 16px;
  line-height: 1.65;
}

.landing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 32px;
  width: 100%;
  max-width: 380px;
}

.landing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--color-text);
  text-align: left;
}

.feature-icon {
  font-size: 1.2rem;
  width: 28px;
  text-align: center;
  flex-shrink: 0;
}

/* Lead Form */
.lead-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 380px;
  margin-top: 36px;
}

.input-group input {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-group input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(26, 155, 160, 0.12);
}

.input-group input.error {
  border-color: var(--color-error);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.input-group input::placeholder {
  color: var(--color-text-secondary);
}

.landing-proof {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--color-text-secondary);
  margin-top: 16px;
}

.landing-disclaimer {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 16px;
}

/* ========================================
   Buttons
   ======================================== */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  transition: background var(--transition), transform 0.15s ease;
  text-decoration: none;
  line-height: 1.4;
}

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

.btn-primary:active {
  transform: scale(0.97);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.9rem;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  background: var(--color-bg-secondary);
  color: var(--color-text);
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  transition: background var(--transition), transform 0.15s ease;
}

.btn-secondary:hover {
  background: #E8E8ED;
}

.btn-secondary:active {
  transform: scale(0.97);
}

.btn-back {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  color: var(--color-accent);
  cursor: pointer;
  border-radius: 50%;
  transition: background var(--transition);
  flex-shrink: 0;
}

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

/* ========================================
   Quiz Header / Progress
   ======================================== */

.quiz-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.progress-bar {
  flex: 1;
  height: 4px;
  background: var(--color-bg-secondary);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 2px;
  transition: width var(--transition);
}

.progress-label {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  flex-shrink: 0;
}

.quiz-question {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 28px;
}

.quiz-hint {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  font-style: italic;
  line-height: 1.5;
  margin-top: -18px;
  margin-bottom: 24px;
}

/* ========================================
   Option Cards
   ======================================== */

.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.options-single-col {
  grid-template-columns: 1fr;
}

.option-card[hidden] {
  display: none;
}

.option-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 18px 20px;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition), transform 0.15s ease;
}

.option-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px var(--color-card-shadow);
}

.option-card:active {
  transform: scale(0.98);
}

.option-card.selected {
  border-color: var(--color-accent);
  background: rgba(26, 155, 160, 0.04);
  box-shadow: 0 0 0 3px rgba(26, 155, 160, 0.15);
}

.option-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.option-desc {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.45;
}

/* Custom Input (Outra/Outro) */
.custom-input-wrapper {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.custom-input-wrapper[hidden] {
  display: none;
}

.custom-input-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.custom-input {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.custom-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(26, 155, 160, 0.12);
}

/* ========================================
   Output Page
   ======================================== */

.output-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 40px;
}

.output-check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--color-success);
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 20px;
}

.output-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
  max-width: 560px;
}

/* Output Notice */
.output-notice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: 28px;
}

.notice-text {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.notice-text strong {
  color: var(--color-text);
  font-weight: 600;
}

.notice-btn {
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--color-accent);
  background: none;
  border: 1.5px solid var(--color-accent);
  border-radius: 9999px;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

.notice-btn:hover {
  background: var(--color-accent);
  color: white;
}

/* Instructions */
.instructions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.instructions[hidden] {
  display: none;
}

.instruction-step {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-bg-secondary);
}

.instruction-step:last-child {
  border-bottom: none;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-bg-secondary);
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-number-success {
  background: var(--color-success);
  color: white;
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text);
}

.step-content strong {
  color: var(--color-accent);
  font-weight: 600;
}

.step-content code {
  display: inline;
  padding: 2px 8px;
  background: var(--color-bg-secondary);
  border-radius: 6px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  color: var(--color-text);
}

.step-separator {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 32px 0 24px;
}

.step-note {
  font-size: 0.78rem;
  font-style: italic;
  color: #B0B0B5;
  line-height: 1.55;
}

/* Step Guide Images */
.step-guide-img {
  width: 100%;
  max-width: 100%;
  border-radius: var(--radius);
  margin-top: 12px;
  border: 1px solid var(--color-border);
}

.step-imgs-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  overflow-x: auto;
}

.step-guide-img-sm {
  max-height: 200px;
  width: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* Code Viewer */
.code-viewer {
  margin-top: 12px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #F6F6F4;
  border: 1px solid #E8E8E4;
}

.code-viewer-sm {
  margin-top: 16px;
}

.code-viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid #E8E8E4;
}

.code-lang {
  font-size: 0.75rem;
  font-weight: 500;
  color: #8B8B85;
  letter-spacing: 0.02em;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: #8B8B85;
  font-size: 0.8rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.btn-copy:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--color-text);
}

.btn-copy.copied {
  background: var(--color-success);
  color: white;
}

.code-block {
  padding: 20px;
  margin: 0;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.78rem;
  line-height: 1.8;
  color: #37352F;
  overflow-x: auto;
  white-space: pre;
}

.code-block-sm {
  font-size: 0.85rem;
  padding: 16px 20px;
  word-break: break-all;
  white-space: pre-wrap;
}

/* Syntax Highlighting */
.hl-keyword { color: #CF222E; }
.hl-string { color: #0A3069; }
.hl-comment { color: #6E7781; }
.hl-tag { color: #116329; }
.hl-method { color: #8250DF; }
.hl-class { color: #953800; }
.hl-prop { color: #0550AE; }

/* URL Input */
.url-input-group {
  margin-top: 12px;
}

.url-input {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.url-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(26, 155, 160, 0.12);
}

.utm-result {
  margin-top: 0;
}

/* Visit Button */
.btn-visit {
  margin-top: 12px;
}

/* Success Step */
.step-success .step-content p {
  font-weight: 600;
  color: var(--color-success);
  font-size: 1.05rem;
}

/* Step Warning */
.step-warning {
  background: rgba(255, 204, 0, 0.1);
  border-left: 3px solid #F5A623;
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 20px;
  color: var(--color-text);
}

/* Step List */
.step-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.step-list li {
  background: var(--color-bg-secondary);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
}

/* Option Label */
.option-label {
  font-size: 0.88rem;
  font-weight: 600;
  margin-top: 16px;
  margin-bottom: 8px;
  color: var(--color-text);
}

/* Step Note Inline */
.step-note-inline {
  background: var(--color-bg-secondary);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-top: 16px;
  color: var(--color-text-secondary);
}

/* Dead-end message */
.deadend-message {
  text-align: center;
  margin-top: 40px;
}

.deadend-text {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* Output Footer */
.output-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 48px;
  padding-bottom: 24px;
}

/* Suggestion Button (inside instructions) */
.btn-suggestion-step {
  display: block;
  width: 100%;
  margin-top: 24px;
}

/* Suggestion Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  max-width: 480px;
  width: 100%;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  line-height: 1;
}

.modal-title {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 16px;
  padding-right: 24px;
}

.modal-textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  resize: vertical;
  min-height: 100px;
  transition: border-color var(--transition), box-shadow var(--transition);
  margin-bottom: 16px;
}

.modal-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(26, 155, 160, 0.12);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 540px) {
  html {
    font-size: 16px;
  }

  .screen {
    padding: 24px 16px 48px;
  }

  .landing-title {
    font-size: 1.9rem;
  }

  .quiz-question {
    font-size: 1.25rem;
  }

  .options-grid {
    grid-template-columns: 1fr;
  }

  .quiz-header {
    gap: 10px;
  }

  .instruction-step {
    gap: 12px;
  }

  .code-block {
    font-size: 0.72rem;
  }

  .output-title {
    font-size: 1.15rem;
  }
}