@import url('https://fonts.googleapis.com/css2?family=Google+Sans+Flex:wght@400;500;600&family=Google+Sans+Text:wght@400;500&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-sans: 'Google Sans Flex', 'Google Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-text: 'Google Sans Text', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* DeepSeek Brand Palette */
  --color-primary: #4d6bfe;
  --color-primary-hover: #3b5dfe;
  --color-primary-container: rgba(77, 107, 254, 0.12);
  --color-primary-button: #4d6bfe;

  --color-canvas: #090c15;
  --color-surface-1: #0f1422;
  --color-surface-2: #161d31;
  --color-surface-3: #1e2740;

  --color-ink: #e8ecf8;
  --color-ink-muted: #9aa5be;
  --color-ink-soft: #67748e;

  --color-hairline: rgba(255, 255, 255, 0.07);
  --color-hairline-card: rgba(255, 255, 255, 0.12);
}

.light-theme {
  --color-primary: #3b5dfe;
  --color-primary-hover: #2f54eb;
  --color-primary-container: #e6edff;
  --color-primary-button: #3b5dfe;

  --color-canvas: #f4f6fc;
  --color-surface-1: #ffffff;
  --color-surface-2: #eaeffa;
  --color-surface-3: #dde5f7;

  --color-ink: #0f172a;
  --color-ink-muted: #475569;
  --color-ink-soft: #64748b;

  --color-hairline: #e2e8f0;
  --color-hairline-card: #cbd5e1;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  height: 100dvh;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-canvas);
  color: var(--color-ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.2s ease, color 0.2s ease;
  overscroll-behavior-y: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 400;
}

code, pre, kbd, .font-mono {
  font-family: var(--font-mono);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-hairline-card);
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-ink-soft);
}

/* Suggestion Chips */
.deepseek-chip {
  background: var(--color-surface-1);
  border: 1px solid var(--color-hairline);
  color: var(--color-ink);
  border-radius: 9999px;
  padding: 9px 18px;
  font-size: 13.5px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.deepseek-chip:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
  color: #ffffff;
  transform: translateY(-1px);
}

.deepseek-chip:active {
  transform: scale(0.97);
}

/* Prompt Input Card */
.deepseek-input-card {
  background: var(--color-surface-1);
  border: 1px solid var(--color-hairline);
  border-radius: 24px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.deepseek-input-card:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), 0 8px 32px rgba(77, 107, 254, 0.15);
}

/* Mobile Textarea Fix: font-size 16px prevents iOS Safari auto-zoom */
#prompt-input {
  font-size: 16px;
}

@media (min-width: 640px) {
  #prompt-input {
    font-size: 0.95rem;
  }
}

/* Voice Input Recording Animation */
.voice-recording-active {
  color: #ef4444 !important;
  background-color: rgba(239, 68, 68, 0.15) !important;
}

/* Sidebar Smooth Transitions & Mobile Drawer */
#sidebar {
  transition: width 0.25s cubic-bezier(0.2, 0, 0, 1), transform 0.25s cubic-bezier(0.2, 0, 0, 1), opacity 0.2s ease;
  will-change: width, transform;
}

#sidebar .sidebar-content {
  transition: opacity 0.15s ease;
}

@media (min-width: 768px) {
  #sidebar.collapsed {
    width: 0 !important;
    min-width: 0 !important;
    border-right-width: 0 !important;
    opacity: 0;
    pointer-events: none;
  }
  
  #sidebar.collapsed .sidebar-content {
    opacity: 0;
    pointer-events: none;
  }

  body:not(.sidebar-collapsed) #sidebar-toggle-btn {
    display: none !important;
  }
}

@media (max-width: 767px) {
  #sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 50;
    height: 100dvh;
    box-shadow: 12px 0 35px rgba(0, 0, 0, 0.75);
  }
  #sidebar.mobile-closed {
    transform: translateX(-100%) !important;
  }
}

/* Safe Area Inset Handling for iOS and Android */
.safe-bottom-area {
  padding-bottom: max(16px, env(safe-area-inset-bottom));
}

.safe-top-area {
  padding-top: max(8px, env(safe-area-inset-top));
}

/* Message Animation */
.msg-anim {
  animation: messageEnter 0.24s cubic-bezier(0.2, 0, 0, 1) forwards;
}

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

/* Modal Animations */
.modal-backdrop-anim {
  animation: backdropEnter 0.2s ease-out forwards;
}

.modal-content-anim {
  animation: modalEnter 0.24s cubic-bezier(0.2, 0, 0, 1) forwards;
}

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

@keyframes modalEnter {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Markdown Rendering Engine */
.markdown-body {
  color: var(--color-ink);
  line-height: 1.7;
  font-size: 0.94rem;
  word-break: break-word;
}

.markdown-body p {
  margin-bottom: 0.9rem;
}

.markdown-body p:last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--color-ink);
  font-weight: 500;
  margin-top: 1.3rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.markdown-body h1 { font-size: 1.35rem; border-bottom: 1px solid var(--color-hairline); padding-bottom: 0.35rem; }
.markdown-body h2 { font-size: 1.18rem; }
.markdown-body h3 { font-size: 1.05rem; }
.markdown-body h4 { font-size: 0.95rem; }

.markdown-body ul, 
.markdown-body ol {
  margin-bottom: 0.9rem;
  padding-left: 1.4rem;
}

.markdown-body ul { list-style-type: disc; }
.markdown-body ol { list-style-type: decimal; }

.markdown-body li {
  margin-bottom: 0.3rem;
}

.markdown-body blockquote {
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface-2);
  padding: 0.6rem 0.9rem;
  margin: 0.9rem 0;
  border-radius: 0 12px 12px 0;
  color: var(--color-ink-muted);
  font-style: italic;
}

.markdown-body hr {
  border: 0;
  height: 1px;
  background: var(--color-hairline);
  margin: 1.2rem 0;
}

.markdown-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.86rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-hairline);
}

.markdown-body th,
.markdown-body td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--color-hairline);
  text-align: left;
}

.markdown-body th {
  background: var(--color-surface-2);
  color: var(--color-ink);
  font-weight: 500;
}

.markdown-body tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

/* Inline code */
.markdown-body :not(pre) > code {
  background: var(--color-surface-2);
  color: #93b3fd;
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  font-size: 0.86em;
  font-family: var(--font-mono);
  border: 1px solid var(--color-hairline);
}

/* Code Blocks Container */
.code-block-wrapper {
  margin: 1rem 0;
  border-radius: 16px;
  background: #060810;
  border: 1px solid var(--color-hairline);
  overflow: hidden;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 1rem;
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-hairline);
  font-size: 0.72rem;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  user-select: none;
}

.code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  background: var(--color-surface-1);
  border: 1px solid var(--color-hairline);
  color: var(--color-ink);
  font-size: 0.7rem;
  cursor: pointer;
  touch-action: manipulation;
  transition: all 0.15s ease;
}

.code-copy-btn:hover {
  background: var(--color-surface-3);
  color: #ffffff;
}

.code-block-wrapper pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.6;
  background: transparent !important;
}

/* Reasoning Accordion */
.reasoning-container {
  margin-bottom: 0.8rem;
  border-radius: 16px;
  background: var(--color-surface-1);
  border: 1px solid var(--color-hairline);
  overflow: hidden;
}

.reasoning-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  user-select: none;
  background: var(--color-surface-2);
  color: var(--color-ink-muted);
  font-size: 0.78rem;
  font-weight: 500;
  transition: background 0.15s;
}

.reasoning-header:hover {
  color: var(--color-ink);
}

.reasoning-content {
  padding: 0.75rem 0.95rem;
  color: var(--color-ink-muted);
  font-size: 0.84rem;
  line-height: 1.6;
  border-top: 1px solid var(--color-hairline);
  background: var(--color-surface-1);
  max-height: 360px;
  overflow-y: auto;
  font-style: italic;
}

/* Custom Range Slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-surface-3);
  height: 6px;
  border-radius: 9999px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(77, 107, 254, 0.4);
  transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Centered Top Floating Toast */
#toast-container {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  width: 90%;
  max-width: 400px;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface-1);
  color: var(--color-ink);
  padding: 8px 18px;
  border-radius: 9999px;
  border: 1px solid var(--color-hairline-card);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4);
  font-size: 0.82rem;
  font-weight: 500;
  animation: toast-slide-down 0.22s cubic-bezier(0.2, 0, 0, 1);
  backdrop-filter: blur(8px);
}

.toast.toast-success { border-color: rgba(16, 185, 129, 0.4); }
.toast.toast-error { border-color: rgba(239, 68, 68, 0.4); }
.toast.toast-info { border-color: var(--color-primary); }

@keyframes toast-slide-down {
  from { transform: translateY(-16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.3rem 0;
}