/* ============================================
   CRUMP AI - PROFESSIONAL DESIGN SYSTEM v2.1 Pro+
   Vercel-Optimized | Mobile-First | Accessible
   Notes:
   - Backwards compatible: no class/ID renames, only enhancements.
   - Integrity kept for connected files and JS hooks.
   ============================================ */

:root {
  /* ===== COLOR SYSTEM ===== */
  /* Background Layers */
  --color-bg-primary: #0f1419;
  --color-bg-secondary: #171c24; /* subtly darker for contrast separation */
  --color-bg-tertiary: #202634;
  --color-bg-elevated: #242c3b;
  --color-surface: #1a1f29;

  /* Surfaces with subtle tint */
  --surface-tint-1: rgba(201, 184, 146, 0.06);
  --surface-tint-2: rgba(201, 184, 146, 0.09);

  /* Borders */
  --color-border: #2b3544;
  --color-border-hover: #3a4658;
  --color-border-focus: #4a5970;

  /* Text Hierarchy */
  --color-text-primary: #e8eaee;
  --color-text-secondary: #aeb7c4;
  --color-text-tertiary: #8994a5;
  --color-text-muted: #626e7e;

  /* Accent & Brand */
  --color-accent-primary: #d1bf96; /* a touch brighter for legibility */
  --color-accent-hover: #bfa978;
  --color-accent-active: #ad965d;
  --color-accent-subtle: rgba(209, 191, 150, 0.14);

  /* Semantic Colors */
  --color-success: #19b250;
  --color-error: #ef4444;
  --color-warning: #f97316;
  --color-info: #3b82f6;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #d1bf96 0%, #ad965d 100%);
  --gradient-primary-soft: linear-gradient(180deg, rgba(209,191,150,.16), rgba(209,191,150,0));
  --gradient-surface: linear-gradient(135deg, #151a22 0%, #222a38 100%);
  --gradient-stroke: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0));

  /* ===== TYPOGRAPHY SYSTEM ===== */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", sans-serif;
  --font-display: "Crimson Pro", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Cascadia Code", monospace;

  /* Fluid type scale (clamp keeps your base feel but breathes on large screens) */
  --font-size-xs: clamp(0.72rem, 0.68rem + 0.2vw, 0.78rem);
  --font-size-sm: clamp(0.85rem, 0.80rem + 0.2vw, 0.92rem);
  --font-size-base: clamp(1rem, 0.96rem + 0.2vw, 1.05rem);
  --font-size-lg: clamp(1.12rem, 1.06rem + 0.3vw, 1.22rem);
  --font-size-xl: clamp(1.25rem, 1.18rem + 0.4vw, 1.38rem);
  --font-size-2xl: clamp(1.5rem, 1.4rem + 0.6vw, 1.8rem);
  --font-size-3xl: clamp(2rem, 1.85rem + 1vw, 2.4rem);
  --font-size-4xl: clamp(2.5rem, 2.2rem + 1.6vw, 3rem);

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.55;
  --line-height-relaxed: 1.75;

  /* ===== SPACING SYSTEM (4px base unit) ===== */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* ===== LAYOUT CONSTANTS ===== */
  --header-height: 64px;
  --sidebar-width: 280px;
  --max-content-width: 820px; /* +20px breathing room */
  --input-area-height: auto;

  /* ===== ELEVATION (Unified depth language) ===== */
  --shadow-color: 220 16% 6%;
  --shadow-xs: 0 1px 2px rgba(0,0,0,.06);
  --shadow-sm: 0 2px 6px rgba(0,0,0,.08);
  --shadow-md: 0 6px 14px rgba(0,0,0,.12);
  --shadow-lg: 0 14px 28px rgba(0,0,0,.14);
  --shadow-xl: 0 24px 48px rgba(0,0,0,.16);
  --shadow-2xl: 0 32px 64px rgba(0,0,0,.18);

  /* ===== BORDER RADIUS ===== */
  --radius-sm: 6px;
  --radius-md: 10px;   /* slightly softer */
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-2xl: 26px;
  --radius-full: 9999px;

  /* ===== RINGS / FOCUS ===== */
  --ring-width: 3px;
  --ring-color: rgba(209,191,150,.35);

  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms cubic-bezier(.4, 0, .2, 1);
  --transition-base: 220ms cubic-bezier(.4, 0, .2, 1);
  --transition-slow: 320ms cubic-bezier(.2, .7, 0, 1);
  --transition-smooth: 420ms cubic-bezier(.2, .7, 0, 1);

  /* ===== Z-INDEX SCALE ===== */
  --z-base: 0;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal-backdrop: 40;
  --z-modal: 50;
  --z-popover: 60;
  --z-tooltip: 70;
  --z-notification: 80;
  --z-max: 9999;

  /* ===== Backdrop strengths ===== */
  --blur-weak: blur(6px);
  --blur-medium: blur(10px);
  --blur-strong: blur(16px);

  color-scheme: dark;
}

/* ============================================
   BASE RESET & NORMALIZATION
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; -webkit-text-size-adjust: 100%; }
html, body { width: 100%; height: 100%; overscroll-behavior: none; -webkit-overflow-scrolling: touch; touch-action: manipulation; }
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: radial-gradient(1200px 800px at 50% -10%, rgba(209,191,150,.06), transparent 60%) , var(--color-bg-primary);
  background-attachment: fixed;
}

/* ============================================
   SPLASH SCREEN
   ============================================ */
.splash-screen {
  position: fixed; inset: 0;
  background: var(--gradient-surface);
  display: flex; align-items: center; justify-content: center;
  z-index: var(--z-max);
  animation: fadeIn 0.4s ease;
}
.splash-content { text-align: center; }
.splash-logo-img {
  width: 400px; /* Larger to accommodate full logo */
  max-width: 90vw; /* Responsive */
  height: auto; /* Maintain aspect ratio */
  margin-bottom: var(--space-6);
}
@keyframes logoFloat { 0%, 100% { transform: translateY(0);} 50% { transform: translateY(-12px);} }

.splash-loader {
  width: min(64vw, 320px);
  height: 3px;
  background: linear-gradient(180deg, #0f1419, #1b222e);
  border-radius: var(--radius-full);
  overflow: hidden; margin: 0 auto;
  border: 1px solid rgba(255,255,255,0.06);
}
.loader-bar {
  width: 50%; height: 100%;
  background: var(--gradient-primary);
  animation: loaderSlide 1.5s ease-in-out infinite;
  filter: saturate(1.05) contrast(1.05);
}
@keyframes fadeIn { from { opacity: 0;} to { opacity: 1;} }
@keyframes loaderSlide { 0% { transform: translateX(-100%);} 100% { transform: translateX(300%);} }

/* ============================================
   MODALS & DIALOGS
   ============================================ */
.modal {
  display: none; position: fixed; inset: 0;
  background: rgba(7, 10, 14, 0.55);
  -webkit-backdrop-filter: var(--blur-strong);
  backdrop-filter: var(--blur-strong);
  align-items: center; justify-content: center;
  z-index: var(--z-modal); padding: var(--space-4);
  animation: modalBackdropFade 0.2s ease;
}
@keyframes modalBackdropFade { from { opacity: 0;} to { opacity: 1;} }

.modal-content {
  background: linear-gradient(0deg, var(--surface-tint-1), transparent), var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  max-width: 560px; width: 100%;
  max-height: 90vh; overflow-y: auto;
  animation: modalSlide 0.3s cubic-bezier(.34, 1.56, .64, 1);
  border: 1px solid transparent;
  background-clip: padding-box;
  position: relative;
}
.modal-content::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  padding: 1px; background: var(--gradient-stroke); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude;
}
@keyframes modalSlide { from { opacity: 0; transform: translateY(28px) scale(.96);} to { opacity: 1; transform: translateY(0) scale(1);} }

.modal-header, .modal-footer { padding: var(--space-6); }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.modal-header h2 { font-size: var(--font-size-xl); font-weight: var(--font-weight-semibold); color: var(--color-text-primary); }
.modal-subtitle { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin-top: var(--space-2); line-height: var(--line-height-relaxed); }
.modal-body { padding: var(--space-6); }
.modal-footer { display: flex; justify-content: flex-end; gap: var(--space-3); border-top: 1px solid rgba(255,255,255,0.06); }

/* ============================================
   ONBOARDING
   ============================================ */
.onboarding-modal { padding: var(--space-10); text-align: center; }
.onboarding-logo {
  width: 300px; 
  max-width: 80vw; 
  height: auto; 
  margin: 0 auto var(--space-6); 
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.onboarding-modal h2 {
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

/* ============================================
   APP CONTAINER & LAYOUT
   ============================================ */
.app-container { display: none; width: 100%; height: 100vh; height: 100dvh; position: fixed; inset: 0; overflow: hidden; }

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
  position: fixed; top: 0; left: -100%;
  width: var(--sidebar-width); max-width: 85vw; height: 100%;
  background: linear-gradient(0deg, var(--surface-tint-2), transparent), var(--color-surface);
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex; flex-direction: column;
  transition: left var(--transition-base);
  z-index: var(--z-fixed); overflow-y: auto;
  padding-top: env(safe-area-inset-top, 0);
}
.sidebar.active { left: 0; box-shadow: var(--shadow-2xl); }
.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-6) var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-branding { display: flex; align-items: center; gap: var(--space-3); }
.sidebar-logo-icon { width: 32px; height: 32px; filter: drop-shadow(0 4px 10px rgba(209,191,150,.18)); }
.sidebar-logo {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-primary);
  letter-spacing: -0.02em;
}
.sidebar-version { font-size: var(--font-size-xs); color: var(--color-text-muted); font-weight: var(--font-weight-medium); }
.sidebar-actions { padding: var(--space-4); border-bottom: 1px solid rgba(255,255,255,0.06); }
.sidebar-section { flex: 1; padding: var(--space-4); overflow-y: auto; }
.section-title {
  display: block; font-size: var(--font-size-xs); font-weight: var(--font-weight-semibold);
  text-transform: uppercase; letter-spacing: .075em; color: var(--color-text-tertiary);
  margin-bottom: var(--space-3); padding: 0 var(--space-2);
}

.chats-list { display: flex; flex-direction: column; gap: var(--space-1); }
.chat-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer; transition: all var(--transition-fast);
  background: transparent; border: 1px solid transparent;
}
.chat-item:hover {
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,0));
  border-color: rgba(255,255,255,0.06);
}
.chat-item.active {
  background: linear-gradient(0deg, rgba(209,191,150,.10), rgba(209,191,150,0.00));
  border-left: 3px solid var(--color-accent-primary);
  padding-left: calc(var(--space-3) - 3px);
}
.chat-item-content { flex: 1; min-width: 0; }
.chat-item-title {
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); color: var(--color-text-primary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.chat-item-time { font-size: var(--font-size-xs); color: var(--color-text-muted); margin-top: var(--space-1); }
.delete-chat-btn {
  opacity: 0; padding: var(--space-1) var(--space-2);
  background: transparent; border: none; color: var(--color-error);
  cursor: pointer; border-radius: var(--radius-sm);
  transition: all var(--transition-fast); font-size: 1.15rem;
}
.chat-item:hover .delete-chat-btn { opacity: 1; }
.delete-chat-btn:hover { background: rgba(239, 68, 68, 0.12); }

.sidebar-footer { border-top: 1px solid rgba(255,255,255,0.06); padding: var(--space-4); }
.sidebar-footer-btn {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: var(--space-3);
  background: transparent; border: none; border-radius: var(--radius-md);
  font-size: var(--font-size-sm); color: var(--color-text-primary);
  cursor: pointer; transition: all var(--transition-fast); gap: var(--space-2);
}
.sidebar-footer-btn:hover { background: rgba(255,255,255,0.04); }
.sidebar-divider { height: 1px; background: rgba(255,255,255,0.06); margin: var(--space-3) 0; }

.sidebar-branding-footer {
  padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2);
  font-size: var(--font-size-xs);
}
.branding-line { display: flex; align-items: center; gap: var(--space-2); color: var(--color-text-tertiary); }
.branding-powered { font-size: 0.6875rem; text-transform: uppercase; letter-spacing: .05em; opacity: .75; }
.branding-engine {
  font-weight: var(--font-weight-bold); font-size: var(--font-size-sm);
  background: var(--gradient-primary); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.branding-status { display: flex; align-items: center; gap: var(--space-2); color: var(--color-text-tertiary); font-size: 0.6875rem; }
.status-indicator { width: 6px; height: 6px; border-radius: 50%; position: relative; }
.status-online { background: var(--color-success); box-shadow: 0 0 0 2px rgba(22,163,74,0.2); animation: pulse-ring 2s ease-out infinite; }
@keyframes pulse-ring { 0%{ transform: scale(1); opacity:.3;} 50%{ transform: scale(1.5); opacity:.1;} 100%{ transform: scale(2); opacity:0;} }

.sidebar-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.45); -webkit-backdrop-filter: var(--blur-medium); backdrop-filter: var(--blur-medium);
  z-index: calc(var(--z-fixed) - 1); animation: fadeIn 0.2s ease;
}
.sidebar-overlay.active { display: block; }

/* ============================================
   MAIN CONTENT AREA & HEADER
   ============================================ */
.main-content { width: 100%; height: 100%; display: flex; flex-direction: column; position: relative; }

.header {
  height: calc(var(--header-height) + env(safe-area-inset-top, 0px));
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0)) , var(--color-surface);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex; align-items: center; justify-content: center;
  padding: 0 var(--space-6);
  padding-top: env(safe-area-inset-top, 0);
  flex-shrink: 0; position: sticky; top: 0; z-index: var(--z-sticky);
  -webkit-backdrop-filter: var(--blur-medium); backdrop-filter: var(--blur-medium);
  position: relative;
}
.header-branding { display: flex; align-items: center; gap: var(--space-3); }
.header #menuBtn {
  position: absolute;
  left: var(--space-6);
}
.header-logo-icon { width: 48px; height: 48px; filter: drop-shadow(0 4px 14px rgba(209,191,150,.22)); }
.header-logo {
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-primary);
  letter-spacing: -0.02em; margin: 0;
}
/* Header Upgrade Button */
.header-upgrade-btn {
  position: absolute;
  right: var(--space-6);
  padding: 0.4rem 0.9rem;
  font-size: var(--font-size-sm);
  border-radius: 999px;
  line-height: 1;
}

/* Optional: tweak on small screens */
@media (max-width: 640px) {
  .header-upgrade-btn {
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
  }
}

/* Temporarily hide header upgrade button (moved into Settings modal) */
.header-upgrade-btn {
  display: none !important;
}


/* ============================================
   CHAT CONTAINER & MESSAGES
   ============================================ */
.chat-container {
  flex: 1; overflow-y: auto;
  padding: var(--space-8) var(--space-6);
  scroll-behavior: smooth;
  background:
    radial-gradient(800px 400px at 100% 0%, rgba(209,191,150,.05), transparent 60%),
    radial-gradient(600px 300px at 0% 20%, rgba(59,130,246,.06), transparent 55%);
}
.message {
  max-width: var(--max-content-width);
  margin: 0 auto var(--space-8);
  animation: messageEnter 0.4s cubic-bezier(.34,1.56,.64,1);
}
@keyframes messageEnter { from { opacity: 0; transform: translateY(16px);} to { opacity: 1; transform: translateY(0);} }

.message-header { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.message-avatar {
  width: 36px; height: 36px; border-radius: var(--radius-full);
  background: linear-gradient(0deg, rgba(255,255,255,.04), rgba(255,255,255,0)), var(--color-bg-tertiary);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary); flex-shrink: 0; box-shadow: var(--shadow-sm);
  border: 1px solid rgba(255,255,255,0.06);
}
.message.user .message-avatar {
  background: var(--gradient-primary); color: var(--color-bg-primary);
  border: none;
}

.message-sender { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); color: var(--color-text-primary); }
.message-time { font-size: var(--font-size-xs); color: var(--color-text-muted); }

.message-content {
  padding: var(--space-5);
  background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(255,255,255,0)), var(--color-surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
/* Paragraph & markdown spacing inside messages */
.message-content p {
  margin: 0 0 var(--space-3);
}

.message-content p:last-child {
  margin-bottom: 0;
}

/* Optional: make lists/bold headings breathe too */
.message-content h1,
.message-content h2,
.message-content h3 {
  margin: 0 0 var(--space-3);
}

.message-content ul {
  padding-left: 1.25rem;
  margin: 0 0 var(--space-3);
}

.message-content li {
  margin-bottom: 0.25rem;
}
.message.user .message-content {
  background: linear-gradient(0deg, rgba(209,191,150,.08), rgba(209,191,150,0)), var(--color-bg-secondary);
  border-color: rgba(209,191,150,.25);
}
.message-content:hover {
  border-color: rgba(255,255,255,0.12);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* ============================================
   THINKING INDICATOR
   ============================================ */
.thinking-indicator {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(var(--space-16) + env(safe-area-inset-bottom, 0));
  z-index: var(--z-fixed);

  width: 100%;
  max-width: var(--max-content-width);
  margin: 0 auto;

  display: none;
  align-items: center;
  gap: var(--space-3);

  padding: var(--space-5);
  background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(255,255,255,0)), var(--color-surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);

  /* So it doesn’t block clicks on the input beneath it */
  pointer-events: none;
}


/* ============================================
   FILE PREVIEW
   ============================================ */
.file-preview {
  display: none; flex-wrap: wrap; gap: var(--space-2);
  padding: var(--space-3); max-width: var(--max-content-width); margin: 0 auto;
}
.file-preview-item {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.file-preview-item:hover { border-color: rgba(255,255,255,0.12); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.file-thumbnail { width: 40px; height: 40px; object-fit: cover; border-radius: var(--radius-sm); }
.file-icon {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--color-accent-primary);
}
.remove-file { padding: 0 var(--space-2); background: transparent; border: none; color: var(--color-error); cursor: pointer; font-size: 1.25rem; transition: opacity var(--transition-fast); }
.remove-file:hover { opacity: .75; }

/* ============================================
   INPUT AREA
   ============================================ */
.input-area {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  border-top: 1px solid rgba(255,255,255,0.06);
  background: linear-gradient(180deg, rgba(255,255,255,0), rgba(255,255,255,.03)), var(--color-surface);
  padding: var(--space-4) var(--space-6);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0));
  z-index: var(--z-sticky);
  -webkit-backdrop-filter: var(--blur-medium);
  backdrop-filter: var(--blur-medium);
  transition: transform 0.3s ease;
  will-change: transform;
}
.quick-actions { display: flex; gap: var(--space-2); margin-bottom: var(--space-3); overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.quick-actions::-webkit-scrollbar { display: none; }
.quick-action-btn {
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs); color: var(--color-text-secondary);
  cursor: pointer; transition: all var(--transition-fast); white-space: nowrap; flex-shrink: 0;
}
.quick-action-btn:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border-color: rgba(255,255,255,0.12);
  transform: translateY(-1px);
}
.input-container {
  display: flex; align-items: flex-end; gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}
.input-container:focus-within {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 var(--ring-width) var(--color-accent-subtle);
}
.message-input {
  flex: 1; background: transparent; border: none; color: var(--color-text-primary);
  font-size: var(--font-size-base); font-family: var(--font-sans); resize: none; outline: none;
  min-height: 24px; max-height: 220px; line-height: var(--line-height-normal);
}
.message-input::placeholder { color: var(--color-text-muted); }

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  border: none;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-family: var(--font-sans);
  will-change: transform;
}
.btn-primary {
  background: var(--gradient-primary); color: var(--color-bg-primary); box-shadow: var(--shadow-sm);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(255,255,255,0)), var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid rgba(255,255,255,0.06);
}
.btn-secondary:hover { background: var(--color-bg-elevated); border-color: rgba(255,255,255,0.12); }

.btn-danger-outline {
  background: transparent; border: 2px solid var(--color-error); color: var(--color-error);
}
.btn-danger-outline:hover { background: rgba(239, 68, 68, 0.12); }

.btn-block { width: 100%; }
.btn-large { padding: var(--space-4) var(--space-6); font-size: var(--font-size-base); }
.btn-icon {
  padding: var(--space-2);
  background: transparent; border: none; color: var(--color-text-secondary);
  cursor: pointer; border-radius: var(--radius-md);
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
  display: flex; align-items: center; justify-content: center;
}
.btn-icon:hover { background: rgba(255,255,255,0.06); color: var(--color-text-primary); transform: scale(1.05); }
.btn-send { color: var(--color-accent-primary); }
.btn-send:hover { background: var(--color-accent-subtle); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* ============================================
   FORMS
   ============================================ */
.form-group { margin-bottom: var(--space-5); }
.form-group label {
  display: block; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--color-text-primary); margin-bottom: var(--space-2);
}
.form-input {
  width: 100%; padding: var(--space-3) var(--space-4);
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary); font-size: var(--font-size-base); font-family: var(--font-sans);
  transition: all var(--transition-fast);
}
.form-input:focus {
  outline: none; border-color: var(--color-accent-primary); box-shadow: 0 0 0 var(--ring-width) var(--color-accent-subtle);
}
.checkbox-label { display: flex; align-items: flex-start; gap: var(--space-3); cursor: pointer; padding: var(--space-3); border-radius: var(--radius-md); transition: background var(--transition-fast); }
.checkbox-label:hover { background: rgba(255,255,255,0.04); }

/* ============================================
   SETTINGS
   ============================================ */
.settings-modal { max-width: 640px; }
.settings-section { margin-bottom: var(--space-8); }
.settings-section h3 { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); margin-bottom: var(--space-4); color: var(--color-text-primary); }

/* ============================================
   TOASTS & NOTIFICATIONS
   ============================================ */
.toast-container { position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: var(--z-notification); display: flex; flex-direction: column; gap: var(--space-2); pointer-events: none; }
.toast {
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(255,255,255,0)), var(--color-surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  font-size: var(--font-size-sm);
  min-width: 250px; max-width: 420px;
  animation: toastSlide 0.3s cubic-bezier(.34,1.56,.64,1);
  pointer-events: all;
}
@keyframes toastSlide { from { opacity: 0; transform: translateX(100%);} to { opacity: 1; transform: translateX(0);} }
.toast.success { border-left: 4px solid var(--color-success); }
.toast.error { border-left: 4px solid var(--color-error); }
.toast.warning { border-left: 4px solid var(--color-warning); }
.toast.info { border-left: 4px solid var(--color-info); }

/* ============================================
   MESSAGE STATUS & READ RECEIPTS
   ============================================ */
.message-status {
  font-size: var(--font-size-xs); color: var(--color-text-tertiary);
  margin-top: var(--space-2); display: flex; align-items: center; gap: var(--space-1);
  opacity: 0; animation: fadeInStatus 0.3s ease forwards; animation-delay: 0.2s;
}
@keyframes fadeInStatus { from { opacity: 0; transform: translateY(-4px);} to { opacity: 1; transform: translateY(0);} }
.message-status.read { color: var(--color-accent-primary); }
.message-status svg { width: 12px; height: 12px; }

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--color-bg-tertiary); border-radius: var(--radius-full); transition: background var(--transition-fast); }
::-webkit-scrollbar-thumb:hover { background: var(--color-bg-elevated); }
/* Firefox */
* { scrollbar-width: thin; scrollbar-color: var(--color-bg-tertiary) var(--color-bg-secondary); }

/* ============================================
   TEXT SELECTION
   ============================================ */
::selection { background: var(--color-accent-primary); color: var(--color-bg-primary); }
::-moz-selection { background: var(--color-accent-primary); color: var(--color-bg-primary); }

/* ============================================
   ACCESSIBILITY - FOCUS STATES
   ============================================ */
*:focus { outline: none; }
*:focus-visible {
  outline: var(--ring-width) solid var(--color-accent-primary);
  outline-offset: 2px; border-radius: var(--radius-sm);
}
button:focus-visible,
.btn:focus-visible {
  outline: var(--ring-width) solid var(--color-accent-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 calc(var(--ring-width)*2) var(--color-accent-subtle);
}
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: none; border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 var(--ring-width) var(--color-accent-subtle);
}
a:focus-visible { outline: 2px dashed var(--color-accent-primary); outline-offset: 4px; }
.chat-item:focus-visible { outline: 2px solid var(--color-accent-primary); outline-offset: -2px; background: var(--color-bg-tertiary); }
.message-avatar:focus, .assistant-character:focus { outline: none; }

/* High contrast users */
@media (prefers-contrast: more) {
  .message-content,
  .input-container,
  .btn-secondary,
  .form-input { border-color: rgba(255,255,255,0.22); }
  .quick-action-btn { border-color: rgba(255,255,255,0.22); }
}

/* ============================================
   ACCESSIBILITY - IMPROVED CONTRAST
   ============================================ */
.text-secondary, .chat-preview, .setting-description { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
a { color: #e5d4a3; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; transition: color var(--transition-fast), text-decoration-thickness var(--transition-fast); }
a:hover { color: var(--color-accent-primary); text-decoration-thickness: 2px; }

/* ============================================
   RESPONSIVE DESIGN - MOBILE
   ============================================ */
@media (max-width: 768px) {
  :root { --header-height: 56px; --space-6: 1rem; --space-8: 1.5rem; }
  
  .header {
    height: calc(var(--header-height) + env(safe-area-inset-top, 0px));
  }
  
  .header-logo { font-size: var(--font-size-2xl); }
  .header-logo-icon { width: 36px; height: 36px; }
  .chat-container { padding: var(--space-4); }
  .input-area { padding: var(--space-3); padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0)); }
  .message-avatar, .thinking-avatar { width: 32px; height: 32px; }
  .modal-content { max-width: 95vw; }
  .toast-container { left: var(--space-3); right: var(--space-3); bottom: var(--space-3); }
  .toast { min-width: unset; max-width: 100%; }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.hidden { display: none !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

/* Elevated card utility (non-breaking addition) */
.elevated-card {
  background: linear-gradient(0deg, rgba(255,255,255,.02), rgba(255,255,255,0)), var(--color-surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */
.chat-container, .sidebar-section, .modal-content { will-change: scroll-position; }
.message, .thinking-indicator, .toast { will-change: transform, opacity; }
/* GPU acceleration for smoother animations */
.sidebar, .modal, .btn, .chat-item { transform: translateZ(0); backface-visibility: hidden; }

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .header, .sidebar, .input-area, .btn-icon, .delete-chat-btn { display: none !important; }
  .chat-container { padding: 0; overflow: visible; }
  .message { break-inside: avoid; page-break-inside: avoid; }
}

/* ============================================
   DARK MODE (locked)
   ============================================ */
@media (prefers-color-scheme: light) { /* keep dark for brand consistency */ }

/* ============================================
   REDUCE MOTION SUPPORT
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important; animation-iteration-count: 1 !important;
    transition-duration: .01ms !important; scroll-behavior: auto !important;
  }
  .assistant-character, .thinking-dot, .loader-bar { animation: none !important; }
}

/* ============================================
   DESKTOP CHAT BOTTOM PADDING FIX
   Prevent last messages from hiding behind input bar
   ============================================ */

/* Only devices with a mouse/trackpad (desktop browsers) */
@media (pointer: fine) {
  /* This is the scroll area where messages are rendered */
  #chatContainer {
    /* Make sure it scrolls and reserves space for the fixed input */
    overflow-y: auto;
    overflow-x: hidden;
    padding-bottom: 220px; /* match PWA bottom space so last message clears input */
    box-sizing: border-box;
  }

  /* Extra breathing room for the last message */
  #chatContainer .message:last-child {
    margin-bottom: 1.5rem;
  }
}

/* ============================================
   PWA STANDALONE MODE FIX - Updated
   ============================================ */

/* When running as PWA (standalone mode) */
@media (display-mode: standalone) {
  
  html, body {
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
  }
  
  .app-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
  }
  
  .main-content {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: 100% !important;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }
  
  .header {
    flex-shrink: 0;
  }
  
  .chat-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-4);
    padding-bottom: 220px !important;
  }
  
  .input-area {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0 !important;
    padding-bottom: 0 !important;
    transform: translateZ(0);
  }
  
  .input-container {
    margin-bottom: env(safe-area-inset-bottom, 0) !important;
  }
  
  .input-area,
  .chat-container,
  .main-content {
    transform: none !important;
  }
  
/* PWA Logo Fixes */
  .header-full-logo {
    height: 38px !important;
    width: auto !important;
    transform: none !important;
    max-height: 38px !important;
    max-width: 150px !important;
  }
  
  .splash-logo-img {
    width: 78vw !important;
    max-width: 600px !important;
    transform: scale(1.2) !important;
  }
}

/* iOS PWA specific - aggressive fix */
@supports (-webkit-touch-callout: none) {
  @media (display-mode: standalone) {
    html, body {
      height: -webkit-fill-available !important;
    }
    
    .input-area {
      /* Force flush to bottom on iOS */
      bottom: 0 !important;
      padding-bottom: 0 !important;
      margin-bottom: 0 !important;
    }
  }
}

/* ============================================
   HEADER FULL LOGO
   ============================================ */
.header-full-logo {
  height: 48px;
  width: auto;
  object-fit: contain;
}
/* ============================================
   TEMP: HIDE ASSISTANT AVATAR (BIG LOGO)
   ============================================ */

/* Hide only Crump's avatar bubble, keep your "G" */
.message .avatar.assistant,
.message .avatar.assistant img {
  display: none !important;
}

/* ============================================
   PROFESSIONAL HOVER-ONLY MESSAGE ACTIONS
   (No emojis, clean UI, OpenAI-style)
   ============================================ */

/* Hide by default */
.message-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.6rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translateY(4px);
}

/* Show only when hovering the message */
.message:hover .message-actions {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* Clean professional buttons */
.message-action-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--color-text-secondary);
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Hover effect */
.message-action-btn:hover {
  background: rgba(209,191,150,0.12);
  color: var(--color-text-primary);
  border-color: rgba(209,191,150,0.45);
}

/* Remove emoji spacing visually */
.message-action-btn::first-letter {
  margin-right: 0;
}