:root {
  --bg-color: #131314;
  --sidebar-bg: #1e1f20;
  --text-primary: #e3e3e3;
  --text-secondary: #c4c7c5;
  --hover-bg: #2e2f30;
  --active-bg: #37393b;
  --primary-accent: #8ab4f8;
  --input-bg: #1e1f20;
  --outline-color: #444746;
  --border-color: #3c4043;
  --message-user: #2b2c2d;
  --surface-vibrant: rgba(138, 180, 248, 0.05);
  --gradient-text: linear-gradient(74deg, #4285f4 0, #9b72cb 9%, #d96570 20%, #d96570 24%, #9b72cb 35%, #4285f4 44%, #9b72cb 50%, #d96570 56%, #131314 75%, #131314 100%);
}

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

body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

body.dragging::after {
  content: 'Drop to scan with Joman';
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(138, 180, 248, 0.1);
  border: 4px dashed var(--primary-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  font-size: 2rem;
  font-family: 'Google Sans', sans-serif;
  color: var(--primary-accent);
  pointer-events: none;
  backdrop-filter: blur(4px);
}

.app-container {
  display: flex;
  height: 100vh;
  height: 100dvh;
  width: 100vw;
  overflow: hidden;
}

.sidebar {
  width: 280px;
  background-color: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  padding: 16px;
  border-right: 1px solid var(--border-color);
  flex-shrink: 0;
  transition: transform 0.3s ease, width 0.3s ease;
}

.sidebar-content {
  flex-grow: 1;
  overflow-y: auto;
  margin-bottom: 24px;
  padding-right: 4px;
}

.sidebar-content::-webkit-scrollbar { width: 4px; }

.sidebar.closed {
  width: 0;
  padding: 0;
  margin: 0;
  overflow: hidden;
}

.sidebar-top {
  margin-bottom: 24px;
}

.new-chat-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #37393b;
  color: #c4c7c5;
  border: none;
  padding: 14px 20px;
  border-radius: 28px;
  font-family: 'Google Sans', sans-serif;
  font-weight: 500;
  cursor: pointer;
  margin-bottom: 32px;
  width: fit-content;
  transition: background 0.2s;
}

.new-chat-pill:hover { background: #444746; }
.new-chat-pill .material-symbols-outlined { font-size: 24px; }
.new-chat-pill .label { font-size: 0.875rem; }

.sidebar-section {
  margin-top: 12px;
  margin-bottom: 24px;
}

.section-title {
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 8px;
  padding-left: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-main);
  transition: background-color 0.2s, outline 0.2s;
  width: 100%;
  border: 1px solid transparent;
}

.menu-item:hover { 
  background-color: var(--hover-bg); 
  outline: 1px solid var(--outline-color);
  border-color: var(--outline-color);
}
.menu-item.active { background-color: var(--active-bg); color: var(--primary-accent); }
.menu-item.disabled { opacity: 0.4; cursor: not-allowed; }
.menu-item .material-symbols-outlined, 
.menu-item img { 
  width: 24px; 
  height: 24px; 
  display: flex; 
  align-items: center; 
  justify-content: center;
  object-fit: cover;
  flex-shrink: 0;
  border-radius: 50%;
}

.menu-item .label { font-size: 0.9rem; font-weight: 500; }

.google-signin-btn {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  background: #ffffff;
  color: #3c4043;
  border: 1px solid #dadce0;
  padding: 10px 12px;
  border-radius: 8px;
  font-family: 'Roboto', sans-serif;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s, outline 0.2s;
  width: 100%;
  margin: 4px 0;
}

.google-signin-btn:hover {
  background-color: #f8f9fa;
  box-shadow: 0 1px 2px 0 rgba(60,64,67,.30), 0 1px 3px 1px rgba(60,64,67,.15);
  outline: 1px solid #4285f4;
}

.google-signin-btn svg,
.google-signin-btn img {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.google-signin-btn img {
  width: 18px;
  height: 18px;
}

.google-signin-btn .label {
    font-size: 14px;
}

.chat-history {
  display: flex;
  flex-direction: column;
}

.chat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
  position: relative;
}

.chat-item .title {
  font-size: 0.85rem;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-grow: 1;
}

.chat-item .material-symbols-outlined { font-size: 18px; color: var(--text-secondary); }
.chat-item:hover { background-color: var(--hover-bg); }
.chat-item.active { background-color: var(--active-bg); }

.chat-actions {
  display: none;
  gap: 4px;
}

.chat-item:hover .chat-actions { display: flex; }

.action-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 2px;
  border-radius: 4px;
}

.action-btn:hover { background: var(--active-bg); color: #f28b82; }

.main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  position: relative;
  overflow: hidden;
}

.top-bar {
  display: flex;
  align-items: center;
  height: 64px;
  padding: 0 16px;
  gap: 8px;
}

.icon-button {
  background: none;
  border: none;
  color: var(--text-main);
  padding: 8px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.icon-button:hover { background-color: var(--hover-bg); }

.app-title {
  font-family: 'Google Sans', sans-serif;
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: default;
}

.view-container {
  flex-grow: 1;
  position: relative;
  overflow: hidden;
}

.view {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: none;
  flex-direction: column;
  overflow-y: auto;
}

.view.active { display: flex; }

.scroll-container {
  flex-grow: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.scroll-container::-webkit-scrollbar { width: 8px; }
.scroll-container::-webkit-scrollbar-thumb { background: #3c4043; border-radius: 4px; }

.greeting-container {
  margin: auto;
  text-align: center;
  max-width: 600px;
}

.greeting-text {
  font-family: 'Google Sans', sans-serif;
  font-size: 3rem;
  font-weight: 500;
  line-height: 1.2;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 400% 100%;
}

.chat-window {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-bottom: 40px;
}

.message {
  display: flex;
  flex-direction: column;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.user-message .message-body {
  background-color: var(--message-user);
  padding: 12px 20px;
  border-radius: 20px;
  color: var(--text-primary);
  line-height: 1.5;
  border: 1px solid var(--border-color);
}

.ai-message .message-body {
  background-color: var(--sidebar-bg);
  padding: 16px 20px;
  border-radius: 20px;
  color: var(--text-primary);
  line-height: 1.6;
  border: 1px solid var(--border-color);
  margin-top: 4px;
}

.ai-message {
  align-self: flex-start;
  width: 100%;
}

.ai-message-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.ai-name {
  font-family: 'Google Sans', sans-serif;
  font-weight: 500;
  font-size: 1rem;
}

.thoughts-dropdown {
  margin: 12px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  width: 100%;
}

.thoughts-dropdown summary {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  padding: 6px 12px;
  opacity: 0.7;
  transition: all 0.2s;
  border-left: 2px solid transparent;
  font-size: 0.85rem;
  color: var(--text-secondary);
  width: fit-content;
}

.thoughts-dropdown summary::-webkit-details-marker { display: none; }
.thoughts-dropdown summary { list-style: none; }

.thoughts-dropdown summary .material-symbols-outlined {
  font-size: 18px;
  flex-shrink: 0;
}

.thoughts-dropdown summary .summary-text {
  flex-grow: 1;
}

.thoughts-dropdown summary .chevron {
  transition: transform 0.2s;
}

.thoughts-dropdown summary:hover { opacity: 1; background: rgba(255,255,255,0.03); }

.thoughts-dropdown[open] summary .chevron { transform: rotate(180deg); }
.thoughts-dropdown.completed { border-left: 2px solid var(--primary-accent); }
.thoughts-dropdown.completed summary { opacity: 1; }
.thoughts-dropdown.completed .sparkle-icon { color: var(--primary-accent); animation: none; }

.thoughts-content {
  margin: 4px 0 12px 24px;
  padding: 12px 16px;
  border-left: 2px solid var(--border-color);
  background: rgba(255,255,255,0.015);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  line-height: 1.5;
  white-space: pre-wrap;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.sparkle-icon {
  font-size: 18px;
  color: var(--text-secondary);
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0% { opacity: 0.6; transform: scale(0.95); }
  50% { opacity: 1; transform: scale(1.05); }
  100% { opacity: 0.6; transform: scale(0.95); }
}

.message-body {
  line-height: 1.6;
  font-size: 1rem;
  color: var(--text-main);
  word-wrap: break-word;
}

.message-body pre {
  background: #1e1f20;
  padding: 16px;
  border-radius: 12px;
  overflow-x: auto;
  margin: 12px 0;
  border: 1px solid var(--outline-color);
}

.message-body code {
  font-family: 'Roboto Mono', monospace;
  font-size: 0.9rem;
}

.message-body p { margin-bottom: 12px; }
.message-body ul, .message-body ol { margin-bottom: 12px; padding-left: 24px; }
.message-body li { margin-bottom: 4px; }

.chat-input-area {
  padding: 12px 16px 24px;
  width: 100%;
  max-width: 840px;
  margin: 0 auto;
}

.input-container-group {
  background: var(--input-bg);
  border-radius: 28px;
  padding: 4px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--outline-color);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-container-group:focus-within {
  border-color: var(--primary-accent);
  box-shadow: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
}

.context-pill-container {
  display: none;
  padding: 8px 12px;
  gap: 8px;
  border-bottom: 1px solid var(--outline-color);
  flex-wrap: wrap;
}

.context-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--hover-bg);
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 0.75rem;
  color: var(--text-main);
}

.context-pill .material-symbols-outlined { font-size: 14px; }
.pill-label { color: var(--text-secondary); font-weight: 500; }
.close-pill { font-size: 16px; cursor: pointer; color: var(--text-secondary); }
.close-pill:hover { color: #f28b82; }

.image-preview-container {
  display: none;
  padding: 12px;
  gap: 12px;
  border-bottom: 1px solid var(--outline-color);
}

.input-wrapper {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
}

#user-input {
  flex-grow: 1;
  background: none;
  border: none;
  color: var(--text-main);
  padding: 12px 8px;
  font-size: 1rem;
  outline: none;
  font-family: inherit;
}

.send-button {
  background: none;
  border: none;
  color: var(--primary-accent);
  padding: 8px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.send-button:hover { background-color: var(--hover-bg); }

.disclaimer {
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 12px;
}

.view-header {
  padding: 24px;
  border-bottom: 1px solid var(--outline-color);
  background: var(--bg-color);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-content {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.classes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.class-card {
  background: var(--sidebar-bg);
  border-radius: 16px;
  border: 1px solid var(--outline-color);
  padding: 24px;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
}

.class-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-accent);
}

.class-name { font-family: 'Google Sans'; margin-bottom: 12px; }

.class-teacher {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.detail-content {
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px 60px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.section-label {
  font-family: 'Google Sans';
  font-size: 1.25rem;
  margin-bottom: 16px;
  color: var(--primary-accent);
}

.detail-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.detail-item {
  background: var(--sidebar-bg);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--outline-color);
}

.item-title { font-weight: 500; margin-bottom: 8px; }
.item-meta { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 8px; }
.item-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; white-space: pre-wrap; }

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
}

.status-turned-in { background: rgba(138, 180, 248, 0.2); color: #8ab4f8; }
.status-missing { background: rgba(242, 139, 130, 0.2); color: #f28b82; }
.status-assigned { background: rgba(129, 201, 149, 0.2); color: #81c995; }

.instruction-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-main);
  white-space: pre-wrap;
}

.image-preview {
  position: relative;
  transition: transform 0.2s;
}

.image-preview:hover { transform: scale(1.05); }

.message.ai-message.loading {
  padding: 12px 0;
}

.thinking-bubbles {
  display: flex;
  gap: 4px;
}

.thinking-bubbles span {
  width: 8px;
  height: 8px;
  background: var(--text-secondary);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}

.thinking-bubbles span:nth-child(1) { animation-delay: -0.32s; }
.thinking-bubbles span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1.0); }
}

@media (max-width: 1024px) {
  .sidebar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100dvh;
    z-index: 2000;
    width: 280px;
    transform: translateX(-100%);
    box-shadow: 10px 0 30px rgba(0,0,0,0.5);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    width: 100vw;
  }

  .greeting-text {
    font-size: 2.2rem;
  }

  .chat-window {
    width: 100%;
    padding: 0 16px;
  }
}

@media (max-width: 600px) {
  .sidebar {
    width: 85%;
  }

  .greeting-text {
    font-size: 1.8rem;
  }

  .chat-input-area {
    padding: 12px;
  }
}

.quiz-box {
  background: var(--active-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.quiz-question {
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--primary-accent);
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.quiz-option {
  background: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 12px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.95rem;
  text-align: left;
}

.quiz-option:hover:not(:disabled) {
  background: var(--hover-bg);
  border-color: var(--primary-accent);
}

.quiz-option.correct {
  background: rgba(129, 201, 149, 0.1);
  border-color: #81c995;
  color: #81c995;
}

.quiz-option.incorrect {
  background: rgba(242, 139, 130, 0.1);
  border-color: #f28b82;
  color: #f28b82;
}

.quiz-input-row {
  display: flex;
  gap: 12px;
}

.quiz-input {
  flex-grow: 1;
  background: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: 12px;
  outline: none;
}

.quiz-feedback {
  padding: 12px;
  border-radius: 12px;
  font-size: 0.9rem;
  line-height: 1.5;
}

.quiz-feedback.success {
  background: rgba(129, 201, 149, 0.1);
  color: #81c995;
  border: 1px solid rgba(129, 201, 149, 0.2);
}

.quiz-feedback.error {
  background: rgba(242, 139, 130, 0.1);
  color: #f28b82;
  border: 1px solid rgba(242, 139, 130, 0.2);
}

.quiz-placeholder {
  font-style: italic;
  color: var(--text-secondary);
  padding: 12px;
  background: var(--surface-vibrant);
  border-radius: 8px;
  border: 1px dashed var(--primary-accent);
}

@media (max-width: 600px) {
  .quiz-options {
    grid-template-columns: 1fr;
  }
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}


.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #3c4043;
  transition: .4s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px; width: 18px;
  left: 3px; bottom: 3px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-accent);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--primary-accent);
}

input:checked + .slider:before {
  transform: translateX(26px);
}
.app-footer {
  padding: 24px;
  text-align: center;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-color);
}

.app-footer a {
  color: var(--primary-accent);
  text-decoration: none;
  margin: 0 12px;
}

.app-footer a:hover {
  text-decoration: underline;
}