/* ===========================
   CSS Variables
   =========================== */
:root {
  /* Font sizes */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 20px;
  --font-size-xl: 28px;

  /* Line heights */
  --line-height-tight: 1.3;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  /* Colors - Light mode only */
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F5F5F5;
  --color-bg-tertiary: #E8E8E8;

  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;

  --color-accent: #0066FF;
  --color-success: #00AA00;
  --color-error: #DD0000;
  --color-warning: #FF8800;

  --color-border: #DDDDDD;
  --color-border-focus: #0066FF;
}

/* ===========================
   Global Resets
   =========================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
}

/* ===========================
   Header
   =========================== */
.header {
  padding: 24px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0;
  color: var(--color-text-primary);
}

.header-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 4px 0 0 0;
}

.btn-icon {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
  transition: transform 0.2s ease;
}

.btn-icon:hover {
  transform: scale(1.1);
}

/* ===========================
   Container
   =========================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
}

/* ===========================
   Mode Selector
   =========================== */
.mode-selector {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.mode-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 102, 255, 0.05));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mode-btn:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 102, 255, 0.15);
}

.mode-btn:hover::before {
  opacity: 1;
}

.mode-btn.active {
  background: linear-gradient(135deg, var(--color-accent), #0052CC);
  color: white;
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
  transform: translateY(-2px);
}

.mode-btn.active::before {
  opacity: 0;
}

.mode-btn .emoji {
  font-size: 22px;
  transition: transform 0.3s ease;
}

.mode-btn:hover .emoji {
  transform: scale(1.1);
}

.mode-btn.active .emoji {
  transform: scale(1.15);
}

/* ===========================
   Input Panel
   =========================== */
.input-panel {
  margin-bottom: 32px;
}

.input-field {
  width: 100%;
  padding: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  resize: vertical;
  min-height: 150px;
  background: var(--color-bg);
  color: var(--color-text-primary);
}

.input-field:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.sub-mode-selector,
.reasoning-selector {
  display: flex;
  gap: 16px;
  margin: 16px 0;
  font-size: var(--font-size-sm);
  flex-wrap: wrap;
}

.sub-mode-selector label,
.reasoning-selector label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--color-accent), #0052CC);
  color: white;
  border: none;
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-md);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #0052CC, #003D99);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 102, 255, 0.4);
}

.btn-primary:hover:not(:disabled)::before {
  left: 100%;
}

.btn-primary:active:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-primary .emoji {
  font-size: 22px;
  animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* ===========================
   Questions Panel (Mode A)
   =========================== */
.questions-panel {
  padding: 24px;
  background: var(--color-bg-secondary);
  border-radius: 4px;
  margin: 24px 0;
}

.questions-title {
  font-size: var(--font-size-lg);
  margin: 0 0 20px 0;
}

.question-item {
  margin-bottom: 24px;
}

.question-label {
  display: block;
  font-size: var(--font-size-md);
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text-primary);
}

.answer-input {
  width: 100%;
  padding: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  resize: vertical;
  min-height: 80px;
}

.answer-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

/* ===========================
   Loading State
   =========================== */
.loading-state {
  text-align: center;
  padding: 40px;
}

.loading-state .emoji {
  font-size: 48px;
  display: block;
  margin-bottom: 16px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.loading-text {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.loading-bar {
  width: 200px;
  height: 4px;
  background: var(--color-bg-secondary);
  border-radius: 2px;
  margin: 0 auto;
  overflow: hidden;
}

.loading-progress {
  height: 100%;
  background: var(--color-accent);
  animation: loading 1.5s ease-in-out infinite;
}

@keyframes loading {
  0% { width: 0%; margin-left: 0%; }
  50% { width: 50%; margin-left: 25%; }
  100% { width: 0%; margin-left: 100%; }
}

/* ===========================
   Output Panel
   =========================== */
.output-panel {
  margin-top: 32px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  flex-wrap: wrap;
  gap: 16px;
}

.output-title {
  font-size: var(--font-size-lg);
  margin: 0;
}

.output-controls {
  display: flex;
  gap: 16px;
  font-size: var(--font-size-sm);
}

.output-controls label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.output-field {
  padding: 20px;
  min-height: 200px;
  max-height: 600px;
  overflow-y: auto;
}

.output-field pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
}

.output-footer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  flex-wrap: wrap;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.copy-feedback {
  font-size: var(--font-size-sm);
  color: var(--color-success);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.copy-feedback.show {
  opacity: 1;
}

.output-metadata {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-left: auto;
}

/* ===========================
   Error Message
   =========================== */
.error-message {
  padding: 16px 20px;
  background: #FFF0F0;
  border: 1px solid var(--color-error);
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
}

.error-message .emoji {
  font-size: 24px;
}

.error-text {
  color: var(--color-error);
  margin: 0;
  font-size: var(--font-size-sm);
}

/* ===========================
   Modal
   =========================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: var(--color-bg);
  border-radius: 4px;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.btn-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-close:hover {
  background: var(--color-bg-secondary);
  border-radius: 4px;
}

.modal-body {
  padding: 20px;
}

.settings-info {
  margin-bottom: 24px;
  line-height: var(--line-height-relaxed);
}

.settings-section {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.settings-section h3 {
  font-size: var(--font-size-md);
  margin-bottom: 12px;
}

.settings-section p {
  margin-bottom: 8px;
  color: var(--color-text-secondary);
}

.settings-section a {
  color: var(--color-accent);
  text-decoration: none;
}

.settings-section a:hover {
  text-decoration: underline;
}

/* ===========================
   Utility Classes
   =========================== */
.hidden {
  display: none !important;
}

.fade-in {
  animation: fadeIn 0.3s ease-in;
}

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

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

/* Mobile First - Extra Small Devices */
@media (max-width: 480px) {
  :root {
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-md: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
  }

  .container {
    padding: 12px;
  }

  .header {
    padding: 12px;
  }

  .header-title {
    font-size: var(--font-size-lg);
  }

  .header-subtitle {
    font-size: var(--font-size-xs);
  }

  .btn-icon {
    font-size: 20px;
  }

  .mode-selector {
    gap: 6px;
  }

  .mode-btn {
    width: calc(50% - 3px);
    padding: 10px 12px;
    gap: 6px;
    font-size: var(--font-size-xs);
  }

  .mode-btn .emoji {
    font-size: 18px;
  }

  .input-field {
    padding: 12px;
    font-size: var(--font-size-sm);
    min-height: 120px;
  }

  .btn-primary {
    width: 100%;
    justify-content: center;
    padding: 14px 24px;
    font-size: var(--font-size-sm);
  }

  .sub-mode-selector,
  .reasoning-selector {
    flex-direction: column;
    gap: 12px;
  }

  .output-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .output-field {
    padding: 12px;
    max-height: 400px;
  }

  .output-field pre {
    font-size: var(--font-size-sm);
  }

  .output-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .output-metadata {
    margin-left: 0;
    font-size: 10px;
    text-align: center;
  }

  .modal-content {
    width: 95%;
    margin: 10px;
  }

  .questions-panel {
    padding: 16px;
  }

  .answer-input {
    font-size: var(--font-size-xs);
  }
}

/* Small Devices - Phones */
@media (min-width: 481px) and (max-width: 640px) {
  .container {
    padding: 16px;
  }

  .header {
    padding: 16px;
  }

  .header-title {
    font-size: var(--font-size-lg);
  }

  .mode-selector {
    gap: 8px;
  }

  .mode-btn {
    flex: 1;
    min-width: calc(50% - 4px);
  }

  .btn-primary {
    width: 100%;
    justify-content: center;
  }

  .output-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .output-metadata {
    margin-left: 0;
  }

  .output-footer {
    flex-wrap: wrap;
  }

  .btn-secondary {
    flex: 1;
    min-width: 150px;
  }
}

/* Tablets */
@media (min-width: 641px) and (max-width: 1024px) {
  .container {
    padding: 24px;
  }

  .mode-selector {
    justify-content: center;
  }

  .mode-btn {
    min-width: 140px;
  }
}

/* Large Desktop */
@media (min-width: 1025px) {
  .container {
    max-width: 1200px;
    margin: 0 auto;
  }

  .input-field {
    min-height: 180px;
  }

  .output-field {
    max-height: 700px;
  }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
  .container {
    padding: 12px;
  }

  .header {
    padding: 10px 16px;
  }

  .input-field {
    min-height: 100px;
  }

  .mode-selector {
    margin-bottom: 12px;
  }

  .output-field {
    max-height: 200px;
  }
}