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

:root {
  --canvas:       #F5F0E6;
  --canvas-dark:  #EDE7D9;
  --forest:       #2C3E2D;
  --forest-light: #3A5239;
  --terracotta:   #C06A35;
  --terracotta-light: #D4884F;
  --ink:          #2A2520;
  --ink-mid:      #5A5047;
  --ink-light:    #9A8F82;
  --white:        #FFFFFF;
  --shadow:       rgba(42, 37, 32, 0.10);
  --shadow-deep:  rgba(42, 37, 32, 0.20);

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'Inter', system-ui, sans-serif;

  --radius: 16px;
  --radius-sm: 8px;
  --header-h: 68px;
  --input-h: 100px;
}

html, body { height: 100%; overflow: hidden; }

/* Use dynamic viewport height on mobile so browser chrome doesn't overlap content */
@supports (height: 100dvh) {
  .app { height: 100dvh; }
}

body {
  font-family: var(--font-sans);
  background: var(--canvas);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
}

/* ─── App Shell ────────────────────────────────────────────────────────────── */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 860px;
  margin: 0 auto;
}

/* ─── Header ───────────────────────────────────────────────────────────────── */
.header {
  height: var(--header-h);
  background: var(--forest);
  flex-shrink: 0;
  box-shadow: 0 2px 12px var(--shadow-deep);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 100%;
}

.header-identity {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 42px;
  height: 42px;
  background: var(--terracotta);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.header-text h1 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.3px;
}

.header-text .subtitle {
  font-size: 11px;
  color: rgba(255,255,255,0.55);
  font-weight: 300;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-qr {
  background: var(--terracotta);
  color: var(--white);
  border: none;
  border-radius: 20px;
  padding: 7px 16px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
  letter-spacing: 0.3px;
}
.btn-qr:hover { background: var(--terracotta-light); }

.btn-new-session {
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.85);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 7px 16px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
  letter-spacing: 0.3px;
}
.btn-new-session:hover {
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.35);
}

/* ─── QR Modal ─────────────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(42, 37, 32, 0.6);
  z-index: 100;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.visible { display: flex; }

.modal {
  background: var(--white);
  border-radius: 20px;
  padding: 36px 40px;
  text-align: center;
  max-width: 340px;
  width: 90%;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  font-size: 18px;
  color: var(--ink-light);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color 0.15s;
}
.modal-close:hover { color: var(--ink); }

.modal h2 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--forest);
  margin-bottom: 8px;
}

.modal > p {
  font-size: 13px;
  color: var(--ink-mid);
  margin-bottom: 24px;
}

#qrCode {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

#qrCode canvas, #qrCode img {
  border-radius: 10px;
  border: 6px solid var(--canvas);
}

.qr-hint {
  font-size: 12px;
  color: var(--ink-light);
  font-style: italic;
  margin-bottom: 0 !important;
}

/* ─── Chat Area ────────────────────────────────────────────────────────────── */
.chat-area {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px 8px;
  scroll-behavior: smooth;
}

.chat-area::-webkit-scrollbar { width: 6px; }
.chat-area::-webkit-scrollbar-track { background: transparent; }
.chat-area::-webkit-scrollbar-thumb { background: var(--canvas-dark); border-radius: 3px; }

.chat-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 100%;
}

/* ─── Messages ─────────────────────────────────────────────────────────────── */
.message {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.message.user {
  flex-direction: row-reverse;
}

.msg-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
  margin-top: 2px;
}

.message.marilyn .msg-avatar {
  background: var(--forest);
  box-shadow: 0 2px 6px var(--shadow);
}

.message.user .msg-avatar {
  background: var(--terracotta);
  box-shadow: 0 2px 6px var(--shadow);
  font-size: 13px;
}

.msg-bubble {
  max-width: 72%;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.65;
  box-shadow: 0 1px 4px var(--shadow);
}

.message.marilyn .msg-bubble {
  background: var(--white);
  border-top-left-radius: var(--radius-sm);
  color: var(--ink);
}

.message.user .msg-bubble {
  background: var(--forest);
  border-top-right-radius: var(--radius-sm);
  color: rgba(255,255,255,0.92);
}

/* Markdown inside Marilyn's bubbles */
.msg-bubble h1, .msg-bubble h2, .msg-bubble h3 {
  font-family: var(--font-serif);
  margin-top: 10px;
  margin-bottom: 4px;
  color: var(--forest);
}
.msg-bubble h1 { font-size: 17px; }
.msg-bubble h2 { font-size: 15px; }
.msg-bubble h3 { font-size: 14px; }
.msg-bubble p { margin-bottom: 8px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble ul, .msg-bubble ol { margin: 6px 0 8px 18px; }
.msg-bubble li { margin-bottom: 4px; }
.msg-bubble strong { color: var(--forest); font-weight: 600; }
.msg-bubble em { color: var(--ink-mid); }
.msg-bubble code {
  background: var(--canvas);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 13px;
}
.msg-bubble blockquote {
  border-left: 3px solid var(--terracotta);
  padding-left: 12px;
  color: var(--ink-mid);
  margin: 8px 0;
  font-style: italic;
}
.msg-bubble hr {
  border: none;
  border-top: 1px solid var(--canvas-dark);
  margin: 10px 0;
}

/* Uploaded image inside bubble */
.msg-image {
  display: block;
  max-width: 200px;
  max-height: 200px;
  border-radius: 10px;
  margin-bottom: 8px;
  object-fit: cover;
}

/* ─── Typing Indicator ─────────────────────────────────────────────────────── */
.typing-indicator .msg-bubble {
  padding: 14px 18px;
  display: flex;
  gap: 5px;
  align-items: center;
}

.typing-dot {
  width: 7px;
  height: 7px;
  background: var(--ink-light);
  border-radius: 50%;
  animation: typingBounce 1.2s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-5px); opacity: 1; }
}

/* ─── Image Preview Bar ─────────────────────────────────────────────────────── */
.image-preview-bar {
  display: none;
  background: var(--canvas-dark);
  border-top: 1px solid rgba(0,0,0,0.06);
  padding: 8px 20px;
}

.image-preview-bar.visible { display: block; }

.preview-content {
  display: flex;
  align-items: center;
  gap: 10px;
}

.preview-content img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--shadow);
}

#previewName {
  font-size: 12px;
  color: var(--ink-mid);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-remove-image {
  background: none;
  border: none;
  color: var(--ink-light);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.15s;
}
.btn-remove-image:hover { color: var(--terracotta); }

/* ─── Input Area ───────────────────────────────────────────────────────────── */
.input-area {
  background: var(--white);
  border-top: 1px solid rgba(0,0,0,0.06);
  padding: 12px 16px 10px;
  flex-shrink: 0;
  box-shadow: 0 -2px 12px var(--shadow);
}

.input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.btn-upload {
  width: 40px;
  height: 40px;
  background: var(--canvas);
  border: 1px solid var(--canvas-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink-mid);
  flex-shrink: 0;
  transition: all 0.2s;
}
.btn-upload:hover {
  background: var(--canvas-dark);
  color: var(--forest);
  border-color: var(--forest);
}

textarea#messageInput {
  flex: 1;
  background: var(--canvas);
  border: 1px solid var(--canvas-dark);
  border-radius: 20px;
  padding: 10px 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink);
  resize: none;
  outline: none;
  max-height: 120px;
  overflow-y: auto;
  line-height: 1.5;
  transition: border-color 0.2s;
}
textarea#messageInput:focus {
  border-color: var(--forest);
  background: var(--white);
}
textarea#messageInput::placeholder { color: var(--ink-light); }

.btn-send {
  width: 40px;
  height: 40px;
  background: var(--forest);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--white);
  flex-shrink: 0;
  transition: all 0.2s;
}
.btn-send:hover { background: var(--forest-light); transform: scale(1.05); }
.btn-send:disabled { background: var(--ink-light); transform: none; cursor: not-allowed; }

.input-hint {
  font-size: 11px;
  color: var(--ink-light);
  margin-top: 6px;
  text-align: center;
}
.input-hint kbd {
  background: var(--canvas-dark);
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 3px;
  padding: 0 4px;
  font-size: 10px;
  font-family: var(--font-sans);
}

/* ─── Error / System Messages ──────────────────────────────────────────────── */
.message.system .msg-bubble {
  background: #FFF3CD;
  color: #856404;
  border: 1px solid #FFECB5;
  font-size: 13px;
  font-style: italic;
}

/* ─── Loading splash ───────────────────────────────────────────────────────── */
.loading-splash {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 14px;
  color: var(--ink-mid);
}

.loading-splash .splash-icon { font-size: 48px; animation: spin 2s linear infinite; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.loading-splash p { font-family: var(--font-serif); font-size: 16px; font-style: italic; }

/* ─── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .msg-bubble { max-width: 85%; }
  .input-hint { display: none; }
  .chat-area { padding: 16px 12px 8px; }

  /* Generous bottom padding to clear mobile browser chrome + home indicator */
  .input-area {
    padding: 12px 12px 24px;
    padding-bottom: max(24px, env(safe-area-inset-bottom, 24px));
  }

  /* Bigger tap targets on mobile */
  .btn-upload, .btn-send {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
  }

  .btn-upload svg, .btn-send svg {
    width: 24px;
    height: 24px;
  }

  /* Compact header buttons on small screens */
  .btn-qr { padding: 7px 12px; font-size: 11px; }
  .btn-new-session { padding: 7px 10px; font-size: 11px; }

  /* Slightly shorter header */
  .header { height: 58px; }
  .header-text h1 { font-size: 17px; }
  .avatar { width: 36px; height: 36px; font-size: 17px; }
}