/* -------------------------------------------------- */
/* ROOT + GLOBAL                                       */
/* -------------------------------------------------- */
:root {
  /* Original Color Palette */
  --blue1: #4f7df9;
  --blue2: #8fbcff;
  --bg1: #e0eafc;
  --bg2: #cfdef3;
  --ink: #1f2937;
  --muted: #667085;
  --white: #fff;

  /* Semantic Color Variables (adapt to theme) */
  --color-primary: var(--blue1);
  --color-primary-light: var(--blue2);
  --color-bg-main: linear-gradient(135deg, var(--bg1), var(--bg2));
  --color-bg-surface: #ffffff;
  --color-bg-elevated: #ffffff;
  --color-bg-chat: #f5f9ff;
  --color-bg-input: #f0f4fa;
  --color-text-primary: #1f2937;
  --color-text-secondary: #667085;
  --color-text-muted: #9ca3af;
  --color-text-inverse: #ffffff;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-border-input: #cfd7e6;
  --color-success: #0a8a43;
  --color-error: #cc0000;

  /* Apple-inspired Spacing System */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */

  /* Typography Scale */
  --font-xs: 0.75rem;     /* 12px */
  --font-sm: 0.875rem;    /* 14px */
  --font-base: 1rem;      /* 16px */
  --font-lg: 1.125rem;    /* 18px */
  --font-xl: 1.25rem;     /* 20px */
  --font-2xl: 1.5rem;     /* 24px */
  --font-3xl: 2rem;       /* 32px */

  /* Line Heights (Apple uses generous spacing) */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;

  /* Border Radius (Apple style - generous rounded corners) */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Elevation System (subtle Apple-like shadows) */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 40px rgba(0, 0, 0, 0.16);

  /* Touch Target Sizes */
  --touch-target-min: 44px;
  --touch-target-comfortable: 48px;

  /* Transitions (Apple uses smooth, slightly slower animations) */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Sidebar Widths */
  --sidebar-width-full: 260px;
  --sidebar-width-compact: 72px;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --bg1: #1a1a2e;
  --bg2: #16213e;

  --color-bg-main: linear-gradient(135deg, #1a1a2e, #16213e);
  --color-bg-surface: #1e1e2e;
  --color-bg-elevated: #252538;
  --color-bg-chat: #1a1a2e;
  --color-bg-input: #252538;
  --color-text-primary: #f3f4f6;
  --color-text-secondary: #d1d5db;
  --color-text-muted: #9ca3af;
  --color-border: #374151;
  --color-border-light: #2a2a3a;
  --color-border-input: #374151;

  /* Adjust shadows for dark mode (more pronounced) */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 16px 40px rgba(0, 0, 0, 0.7);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 400;
  font-size: var(--font-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column; /* Column on mobile */
  height: 100vh;
  background: var(--color-bg-main);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

.hidden { display: none !important; }

/* -------------------------------------------------- */
/* SIDEBAR (Mobile-First Responsive)                  */
/* -------------------------------------------------- */
/* Base styles: Mobile (< 768px) - Fixed bottom bar */
.sidebar {
  width: 100%;
  height: auto;
  background: linear-gradient(135deg, var(--blue1), var(--blue2));
  color: var(--color-text-inverse);
  padding: var(--space-sm);
  padding-bottom: max(var(--space-sm), env(safe-area-inset-bottom));
  display: flex;
  flex-direction: row;
  box-shadow: var(--shadow-lg);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  overflow: visible;
  transition: width var(--transition-base);
}

.sidebar::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 200px;
  background: url("data:image/svg+xml,%3Csvg width='400' height='400' viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cg stroke='%23ffffff26' stroke-width='0.8' fill='none'%3E%3Cpath d='M0 200 L200 0 L400 200 L200 400 Z'/%3E%3Cpath d='M0 0 L200 200 L400 0'/%3E%3Cpath d='M0 400 L200 200 L400 400'/%3E%3C/g%3E%3C/svg%3E")
              no-repeat bottom center;
  background-size: contain;
  pointer-events: none;
  opacity: 0.3;
}

/* Mobile: Move branding to top bar */
.sidebar h2 {
  display: none; /* Hidden in bottom bar on mobile */
}

/* Mobile: Hide hr separator */
.sidebar hr {
  display: none;
}

/* Mobile top bar for branding */
.main::before {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(135deg, var(--blue1), var(--blue2));
  z-index: 98;
  box-shadow: var(--shadow-md);
}

.main::after {
  content: 'Oscar';
  display: flex;
  position: fixed;
  top: 10px;
  left: var(--space-md);
  color: var(--color-text-inverse);
  font-weight: 700;
  font-size: var(--font-lg);
  z-index: 99;
  line-height: 1;
  pointer-events: none;
}

/* Subtitle underneath Oscar */
.chat-container::before,
.repo-container::before {
  content: 'Your AI-Powered Intelligent OCD Coach';
  display: flex;
  position: fixed;
  top: 35px;
  left: var(--space-md);
  color: var(--color-text-inverse);
  font-weight: 400;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  z-index: 99;
  pointer-events: none;
  opacity: 0.9;
  line-height: 1;
}

.sidebar h2 .subtitle {
  font-size: var(--font-xs);
  font-weight: 400;
  color: var(--color-text-inverse);
  opacity: 0.8;
  line-height: var(--leading-tight);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  text-align: left;
}

.nav-section {
  display: flex;
  flex-direction: row; /* Horizontal on mobile */
  gap: var(--space-xs);
  justify-content: space-around;
  flex: 1;
}

/* Mobile: Icon-only bottom bar links */
.sidebar-link {
  background: none;
  border: none;
  color: var(--color-text-inverse);
  padding: var(--space-sm);
  text-align: center;
  font-size: var(--font-sm);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 0px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  cursor: pointer;
  border: 1px solid #FFFFFF11;
  flex: 1;
  text-decoration: none !important;
  min-height: var(--touch-target-min);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  position: relative;
}

.sidebar-link i {
  font-size: var(--font-xl);
  margin: 0;
}

/* Mobile: Hide text labels */
.sidebar-link span {
  display: none;
}

/* Mobile: Show tooltip on hover */
.sidebar-link::after {
  content: attr(data-label);
  position: absolute;
  bottom: calc(100% + var(--space-xs)); /* Above button on mobile */
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-text-primary);
  color: var(--color-bg-surface);
  border-radius: var(--radius-sm);
  font-size: var(--font-xs);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  z-index: 1000;
}

.sidebar-link:hover::after,
.sidebar-link:focus::after {
  opacity: 1;
}

.sidebar-link:hover {
  background: rgba(255,255,255,0.1);
  transform: translateX(2px);
}

.sidebar-link:active {
  transform: scale(0.98);
}

.sidebar-link.active {
  background: rgba(255,255,255,0.2);
}

/* -------------------------------------------------- */
/* MAIN PANELS (Chat + Repo + Shared Container)        */
/* -------------------------------------------------- */
.main {
  flex: 1;
  display: flex;
  padding-top: 60px; /* Space for top bar on mobile */
  padding-bottom: 70px; /* Space for bottom bar on mobile */
  overflow-y: auto;
}

.chat-container,
.repo-container {
  flex: 1;
  flex-direction: column;
  display: flex;
  background: var(--color-bg-surface);
}

.chat-header,
.repo-header {
  display: none; /* Removed blue top bar */
}

/* -------------------------------------------------- */
/* CHAT MESSAGES                                       */
/* -------------------------------------------------- */
#chat {
  flex: 1;
  padding: var(--space-md);
  overflow-y: auto;
  background: var(--color-bg-chat);
  display: flex;
  flex-direction: column;
}

.message-wrapper {
  display: flex;
  margin: var(--space-sm) 0;
  position: relative;
  align-items: flex-start;
}

.message-wrapper.user {
  justify-content: flex-end;
}

.message-wrapper.system {
  justify-content: flex-start;
}

.message {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  width: 70%;
  line-height: var(--leading-relaxed);
  font-size: var(--font-base);
  font-weight: 500;
  animation: slideIn var(--transition-base) ease-out;
  position: relative;
  word-wrap: break-word;
  word-break: break-word;
}

.message.user {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-bottom-right-radius: var(--radius-sm);
}

.message.system {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* Dark mode: Better contrast for system messages */
[data-theme="dark"] .message.system {
  background: var(--color-bg-elevated);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

/* Message action icons */
.message-actions {
  display: flex;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity var(--transition-fast);
  margin-left: var(--space-sm);
  align-self: flex-start;
  margin-top: var(--space-xs);
}

.message-wrapper.user .message-actions {
  margin-left: 0;
  margin-right: var(--space-sm);
  order: -1;
}

.message-wrapper:hover .message-actions {
  opacity: 1;
}

.message-action-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-surface);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-sm);
}

.message-action-btn:hover {
  background: var(--color-border-light);
  color: var(--color-text-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.message-action-btn:active {
  transform: scale(0.95);
}

.message-action-btn.copied,
.message-action-btn.saved,
.message-action-btn.flagged {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

/* Mobile: Hide actions by default, show below message on tap */
@media (max-width: 767px) {
  .message {
    width: 90%;
  }

  .message-wrapper {
    flex-direction: column;
    align-items: flex-start;
  }

  .message-wrapper.user {
    align-items: flex-end;
  }

  .message-actions {
    display: none;
    margin-top: var(--space-sm);
    margin-left: 0;
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    pointer-events: none;
  }

  /* Show actions when message wrapper has 'active' class */
  .message-wrapper.active .message-actions {
    display: flex;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .message-wrapper.user .message-actions {
    order: 1;
    margin-right: 0;
  }
}

/* CHAT INPUT */
.chat-input {
  padding: var(--space-md);
  display: flex;
  gap: var(--space-md);
  background: var(--color-bg-input);
  border-top: 1px solid var(--color-border);
  position: relative;
}

.chat-input textarea {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-input);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  resize: none;
  font-size: var(--font-base);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 500;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
  transition: border-color var(--transition-fast);
}

.chat-input textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79,125,249,0.1);
}

.chat-input button {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
  border: none;
  padding: 0 var(--space-xl);
  border-radius: var(--radius-lg);
  font-size: var(--font-base);
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  min-height: var(--touch-target-min);
  transition: all var(--transition-base);
}

.chat-input button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.chat-input button:active {
  transform: scale(0.98);
}

/* Typing indicator */
.typing-indicator {
  position: absolute;
  bottom: calc(100% + 8px);
  left: var(--space-md);
  display: none;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
  font-size: var(--font-sm);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  pointer-events: none;
}

.typing-indicator.active {
  display: flex !important;
}

.typing-indicator .dots {
  display: flex;
  gap: 3px;
}

.typing-indicator .dot {
  width: 4px;
  height: 4px;
  background: var(--color-text-secondary);
  border-radius: 50%;
  animation: typing-bounce 1.4s infinite;
}

.typing-indicator .dot:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator .dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing-bounce {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-4px);
  }
}

/* -------------------------------------------------- */
/* DOCUMENTS / REPO VIEW                              */
/* -------------------------------------------------- */
.repo-body {
  flex: 1;
  padding: var(--space-xl);
  background: var(--color-bg-chat);
  overflow-y: auto;
}

.repo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
}

.tile {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  min-height: var(--touch-target-min);
}

.tile:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.tile:active {
  transform: scale(0.98);
}

.tile .icon {
  width: var(--touch-target-min);
  height: var(--touch-target-min);
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #eef2ff, #e0ecff);
  color: #3758f9;
  font-size: var(--font-xl);
  flex-shrink: 0;
}

.tile .meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.tile .title {
  font-weight: 700;
  color: var(--color-text-primary);
  font-size: var(--font-base);
}

.tile .desc {
  color: var(--color-text-secondary);
  font-size: var(--font-sm);
  line-height: var(--leading-normal);
}

/* -------------------------------------------------- */
/* FEEDBACK WIDGET                                    */
/* -------------------------------------------------- */
#feedback-fab {
  position: fixed;
  left: calc(var(--sidebar-width-compact) + var(--space-lg));
  bottom: var(--space-lg);
  z-index: 9999;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  border: 3px solid var(--color-bg-surface);
  cursor: pointer;
  display: grid;
  place-items: center;
  color: var(--color-text-inverse);
  font-size: var(--font-xl);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

#feedback-fab:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

#feedback-fab:active {
  transform: scale(0.95);
}

#feedback-panel {
  position: fixed;
  right: var(--space-lg);
  bottom: 90px;
  z-index: 9999;
  width: 340px;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  animation: slideInFromRight var(--transition-slow) ease-out;
}

.fp-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-weight: 700;
  font-size: var(--font-base);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
}

.fp-body {
  padding: var(--space-lg);
}

.fp-body textarea {
  width: 100%;
  min-height: 110px;
  resize: vertical;
  padding: var(--space-md);
  border: 1px solid var(--color-border-input);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-base);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast);
}

.fp-body textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79,125,249,0.1);
}

.fp-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.btn {
  appearance: none;
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-weight: 600;
  font-size: var(--font-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: var(--touch-target-min);
}

.btn.primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn.primary:active {
  transform: scale(0.98);
}

.btn.ghost {
  background: var(--color-border-light);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn.ghost:hover {
  background: var(--color-border);
}

.btn.ghost:active {
  transform: scale(0.98);
}

.fp-note {
  color: var(--color-text-secondary);
  font-size: var(--font-sm);
  margin-top: var(--space-sm);
  line-height: var(--leading-normal);
}

.fp-success {
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-text-primary);
}

/* -------------------------------------------------- */
/* SIGNUP / LOGIN PAGE                                */
/* -------------------------------------------------- */
.signup-body {
  flex: 1;
  padding: var(--space-xl);
  display: flex;
  justify-content: center;
  align-items: flex-start; /* Changed from center for better overflow handling */
  background: var(--color-bg-chat);
  overflow-y: auto;
  padding-top: var(--space-2xl); /* Add top spacing */
}

.signup-box {
  background: var(--color-bg-surface);
  width: 700px;
  max-width: 100%;
  padding: var(--space-2xl) var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  margin-bottom: var(--space-2xl); /* Ensure bottom spacing */
}

.signup-box h2 {
  text-align: center;
  margin-bottom: var(--space-xl);
  font-weight: 700;
  font-size: var(--font-2xl);
  color: var(--color-text-primary);
}

.signup-box label {
  font-weight: 600;
  font-size: var(--font-sm);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  display: block;
}

.signup-box input {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-border-input);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  font-size: var(--font-base);
  display: block;
  width: 100%;
  min-height: var(--touch-target-min);
  transition: border-color var(--transition-fast);
}

.signup-box input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79,125,249,0.1);
}

.error-msg {
  color: var(--color-error);
  font-weight: 600;
  font-size: var(--font-sm);
  margin-bottom: var(--space-md);
  display: none;
}

.requirements {
  font-size: var(--font-sm);
  color: var(--color-text-secondary);
  margin: var(--space-xs) 0 var(--space-lg) 0;
}

.req-item {
  margin: var(--space-xs) 0;
  line-height: var(--leading-normal);
}

.valid {
  color: var(--color-success);
  font-weight: 600;
}

.invalid {
  color: var(--color-error);
  font-weight: 600;
}

.signup-submit {
  width: 100%;
  padding: var(--space-lg);
  border: none;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  box-shadow: var(--shadow-md);
  color: var(--color-text-inverse);
  font-size: var(--font-lg);
  cursor: pointer;
  font-weight: 600;
  margin-top: var(--space-md);
  min-height: var(--touch-target-comfortable);
  transition: all var(--transition-base);
}

.signup-submit:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.signup-submit:active {
  transform: scale(0.98);
}

.signup-alt-link {
  text-align: center;
  margin-top: var(--space-lg);
  font-size: var(--font-sm);
  color: var(--color-text-secondary);
}

.signup-alt-link a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  transition: text-decoration var(--transition-fast);
}

.signup-alt-link a:hover {
  text-decoration: underline;
}

/* -------------------------------------------------- */
/* ONBOARDING LOCK MODAL                              */
/* -------------------------------------------------- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 9990;
  animation: fadeIn var(--transition-base) ease-out;
}

.modal-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 360px;
  max-width: calc(100% - var(--space-xl));
  background: var(--color-bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-xl);
  text-align: center;
  z-index: 9991;
  animation: slideUp var(--transition-slow) ease-out;
}

.modal-box h3 {
  font-size: var(--font-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.modal-box p {
  font-size: var(--font-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: var(--leading-relaxed);
}

.modal-close-btn {
  background: linear-gradient(135deg, var(--blue1), var(--blue2));
  border: none;
  padding: 0.75rem 1.4rem;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 44px;
}

.modal-close-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.modal-close-btn:active {
  transform: scale(0.98);
}

.checkbox-block {
  display: flex !important;
  align-items: flex-start;
  gap: var(--space-md);
  margin: var(--space-md) 0;
  line-height: var(--leading-normal);
  cursor: pointer;
}

.checkbox-block input[type="checkbox"] {
  margin-top: 2px;
  width: auto !important;
  min-width: 18px;
  min-height: 18px;
  cursor: pointer;
}

.checkbox-block span {
  display: block;
  flex: 1;
  color: var(--color-text-primary);
  font-size: var(--font-sm);
}

.preformatted {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: inherit;
}

/* -------------------------------------------------- */
/* DARK MODE TOGGLE                                   */
/* -------------------------------------------------- */
.theme-toggle-container {
  margin-top: 0;
  padding-top: 0;
  display: flex;
  align-items: center;
}

/* Mobile: Hide hr separator */
.theme-toggle-container hr {
  display: none;
}

/* Mobile: Show logout button in bottom bar - match theme toggle styling */
.logout-btn {
  display: flex;
  min-width: var(--touch-target-min);
  height: var(--touch-target-min);
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  color: var(--color-text-inverse);
  font-size: var(--font-lg);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.logout-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateX(2px);
}

.logout-btn:active {
  transform: scale(0.98);
}

.theme-toggle {
  width: auto;
  min-width: var(--touch-target-min);
  height: var(--touch-target-min);
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-size: var(--font-lg);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateX(2px);
}

.theme-toggle:active {
  transform: scale(0.98);
}

.theme-icon-dark {
  display: none;
}

[data-theme="dark"] .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: inline;
}

/* -------------------------------------------------- */
/* ANIMATION KEYFRAMES                                */
/* -------------------------------------------------- */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translate(-50%, -45%);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

@keyframes slideInFromRight {
  from {
    transform: translateX(20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* -------------------------------------------------- */
/* MOBILE RESPONSIVE (Mobile-First)                   */
/* -------------------------------------------------- */

/* Tablet: 768px and up */
@media (min-width: 768px) {
  /* Restore row layout for desktop */
  body {
    flex-direction: row;
  }

  /* Sidebar returns to left side */
  .sidebar {
    width: var(--sidebar-width-full);
    height: 100vh;
    padding: var(--space-xl) var(--space-lg);
    position: static;
    flex-direction: column;
  }

  .sidebar h2 {
    display: flex;
    font-size: var(--font-xl);
    font-weight: 700;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
    margin-bottom: var(--space-xl);
    color: var(--color-text-inverse);
    text-align: left;
  }

  .sidebar h2 .subtitle {
    display: block;
    font-size: var(--font-sm);
  }

  /* Desktop: Visual separator between header and navigation */
  .sidebar hr {
    display: block;
    border: none;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    margin: var(--space-lg) 0;
    width: 100%;
  }

  .nav-section {
    flex-direction: column;
    gap: 2px; /* Minimal gap between buttons */
    flex: 0;
  }

  .sidebar-link {
    flex-direction: row;
    justify-content: flex-start;
    padding: 0 var(--space-md);
    gap: var(--space-sm);
    text-align: left;
    margin-bottom: var(--space-xs);
    border-radius: var(--radius-md);
    height: var(--touch-target-min);
    min-height: var(--touch-target-min);
    font-size: var(--font-sm);
    line-height: 1;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
  }

  .sidebar-link i {
    font-size: var(--font-base);
  }

  .sidebar-link span {
    display: inline;
  }

  .sidebar-link::after {
    display: none;
  }

  .theme-toggle-container {
    margin-top: auto;
    padding-top: var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--space-sm);
    width: 100%;
  }

  /* Desktop: Visual separator above theme toggle/logout */
  .theme-toggle-container hr {
    display: block;
    border: none;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    margin: 0 0 var(--space-sm) 0;
    width: 100%;
    grid-column: 1 / -1;
  }

  .theme-toggle {
    grid-column: 1;
  }

  /* Make theme toggle full width when there's no logout button */
  .theme-toggle:last-child {
    grid-column: 1 / -1;
  }

  .logout-btn {
    grid-column: 2;
    min-width: var(--touch-target-min);
    height: var(--touch-target-min);
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-inverse);
    font-size: var(--font-base);
  }

  .logout-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateX(2px);
  }

  .logout-btn:active {
    transform: scale(0.98);
  }

  .main {
    padding-top: 0; /* Remove top bar padding on desktop */
    padding-bottom: 0;
  }

  /* Hide mobile top bar on desktop */
  .main::before,
  .main::after,
  .chat-container::before,
  .repo-container::before {
    display: none;
  }

  /* Reset chat input to relative on desktop for typing indicator positioning */
  .chat-input {
    position: relative;
  }

  .chat-container {
    padding-bottom: 0;
  }

  /* Adjust feedback FAB for wider sidebar */
  #feedback-fab {
    left: calc(var(--sidebar-width-full) + var(--space-lg));
  }

  /* Larger spacing for chat/repo */
  #chat {
    padding: var(--space-lg);
  }

  .repo-body {
    padding: var(--space-2xl);
  }
}

/* Desktop: 1024px and up */
@media (min-width: 1024px) {
  body {
    font-size: 1.0625rem;
  }

  .sidebar {
    padding: var(--space-2xl) var(--space-xl);
  }

  #chat {
    padding: var(--space-xl);
  }

  .chat-header,
  .repo-header {
    font-size: var(--font-2xl);
  }

  .signup-box {
    padding: var(--space-3xl) var(--space-2xl);
  }
}

/* Large Desktop: 1440px and up */
@media (min-width: 1440px) {
  /* Removed max-width constraint to allow full width */
}

/* Mobile-specific adjustments (< 768px) */
@media (max-width: 767px) {
  /* Main content adjusts for compact sidebar */
  .main {
    margin-left: 0;
  }

  /* Chat input fixed above bottom bar on mobile */
  .chat-input {
    position: fixed;
    bottom: 60px; /* Above bottom navigation bar */
    left: 0;
    right: 0;
    padding: var(--space-md);
    padding-bottom: var(--space-md);
    background: var(--color-bg-input);
    border-top: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
    z-index: 99;
  }

  #chat {
    padding-top: var(--space-md); /* Ensure content starts below top bar */
    padding-bottom: 150px;
  }

  .typing-indicator {
    bottom: calc(100% + 8px);
  }

  .chat-input textarea {
    font-size: var(--font-base);
    padding: var(--space-md);
  }

  .chat-input button {
    min-width: 56px;
    min-height: 56px;
    border-radius: var(--radius-full);
    padding: 0;
  }

  /* Repo grid single column */
  .repo-grid {
    grid-template-columns: 1fr;
  }

  /* Signup/login centered on mobile */
  .signup-body {
    padding: var(--space-md);
    padding-top: var(--space-md); /* Reduced to prevent cutoff */
    padding-bottom: 0; /* Removed white space */
    overflow-y: auto;
  }

  .signup-box {
    width: 100%;
    max-width: 500px; /* Limit width on mobile */
    padding: var(--space-lg);
    margin-bottom: 80px; /* Space for bottom nav bar */
  }

  .signup-box h2 {
    font-size: var(--font-xl);
    margin-bottom: var(--space-lg);
  }

  .signup-box input {
    font-size: var(--font-base);
    min-height: var(--touch-target-comfortable);
    margin-bottom: var(--space-md);
  }

  .signup-box label {
    margin-bottom: var(--space-xs);
  }

  .signup-submit {
    font-size: var(--font-base);
    position: static; /* Changed from sticky */
    margin-top: var(--space-lg);
    box-shadow: var(--shadow-md);
  }

  .requirements {
    margin-bottom: var(--space-lg);
  }

  /* Modal responsive */
  .modal-box {
    width: calc(100% - var(--space-xl));
    padding: var(--space-xl) var(--space-lg);
  }

  /* Chat header smaller on mobile */
  .chat-header,
  .repo-header {
    font-size: var(--font-lg);
    padding: var(--space-md) var(--space-lg);
  }

  /* Touch-friendly buttons */
  .btn {
    min-height: var(--touch-target-comfortable);
    font-size: var(--font-base);
  }

  .sidebar-link {
    min-height: var(--touch-target-comfortable);
    margin-left: 10px;
    margin-right: 10px;
  }
}

/* Extra small mobile: < 480px */
@media (max-width: 479px) {
  .modal-box {
    width: calc(100% - var(--space-lg));
  }

  #feedback-panel {
    width: calc(100% - var(--space-xl));
    right: var(--space-sm);
    left: var(--space-sm);
    bottom: 90px; /* Above bottom nav bar */
  }
}

/* Preference-based queries */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg1: #1a1a2e;
    --bg2: #16213e;
    --color-bg-main: linear-gradient(135deg, #1a1a2e, #16213e);
    --color-bg-surface: #1e1e2e;
    --color-bg-elevated: #252538;
    --color-bg-chat: #1a1a2e;
    --color-bg-input: #252538;
    --color-text-primary: #f3f4f6;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #9ca3af;
    --color-border: #374151;
    --color-border-light: #2a2a3a;
    --color-border-input: #374151;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 40px rgba(0, 0, 0, 0.7);
  }
}