/* KnownFor Brand Design System */
@import url('https://fonts.googleapis.com/css2?family=Radley:ital@0;1&family=Urbanist:wght@300;400;500;600;700&display=swap');

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

:root {
  /* Primary Colors */
  --kf-neon: #E4FF5A;
  --kf-ink: #30312C;
  --kf-white: #FFFFFF;

  /* Secondary Colors */
  --kf-lime: #DEF663;
  --kf-linen: #F3F6E9;
  --kf-sage: #CCD1BA;

  /* Functional */
  --bg-primary: var(--kf-ink);
  --bg-secondary: #3a3b36;
  --bg-tertiary: #454640;
  --text-primary: var(--kf-white);
  --text-secondary: var(--kf-sage);
  --accent: var(--kf-neon);
  --accent-hover: var(--kf-lime);
  --success: var(--kf-neon);
  --warning: #f59e0b;
  --error: #ef4444;
  --border: #4a4b45;

  /* Typography */
  --font-serif: 'Radley', Georgia, serif;
  --font-sans: 'Urbanist', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
}

/* Brand Motif Background */
body::before {
  content: '';
  position: fixed;
  bottom: 0;
  right: 0;
  width: 50%;
  height: 50%;
  background-image: url('https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSYR3S8RI0zjXxUNjTg9NCopPukVUPZWWcuiQ&s');
  background-size: cover;
  background-position: center;
  opacity: 0.03;
  pointer-events: none;
  z-index: 0;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(48, 49, 44, 0.95);
  backdrop-filter: blur(8px);
}

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

.logo-image {
  height: 40px;
  width: auto;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 400;
  color: var(--kf-neon);
  letter-spacing: -0.5px;
}

.header-subtitle {
  font-family: var(--font-sans);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
}

.user-name {
  color: var(--text-secondary);
}

.logout-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 12px;
  transition: all 0.2s;
}

.logout-link:hover {
  border-color: var(--kf-neon);
  color: var(--kf-neon);
}

/* Main */
.main {
  flex: 1;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
}

/* Start Panel */
.start-panel {
  max-width: 480px;
  margin: 40px auto;
  width: 100%;
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--border);
}

.start-panel h2 {
  font-family: var(--font-serif);
  margin-bottom: 28px;
  font-size: 32px;
  font-weight: 400;
  color: var(--kf-neon);
}

.start-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.form-group input,
.form-group select {
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--kf-neon);
  box-shadow: 0 0 0 3px rgba(228, 255, 90, 0.15);
}

.upload-fallback-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.upload-fallback-link:hover {
  color: var(--kf-neon);
}

.file-upload {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 36px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-primary);
  margin-top: 12px;
}

.file-upload:hover {
  border-color: var(--kf-neon);
  background: rgba(228, 255, 90, 0.03);
}

.file-upload input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
}

.file-icon {
  font-size: 36px;
  filter: grayscale(1);
}

.file-text {
  font-size: 14px;
}

.file-name {
  color: var(--kf-neon);
  font-weight: 600;
  margin-top: 8px;
}

.btn-primary {
  padding: 16px 28px;
  background: var(--kf-neon);
  color: var(--kf-ink);
  border: none;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 8px;
}

.btn-primary:hover {
  background: var(--kf-lime);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(228, 255, 90, 0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Chat Panel */
.chat-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 20px;
}

.session-info {
  padding: 14px 18px;
  background: var(--bg-secondary);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
}

.session-info strong {
  color: var(--kf-neon);
  font-weight: 600;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px 0;
  min-height: 400px;
  max-height: calc(100vh - 350px);
}

.message {
  padding: 18px 20px;
  border-radius: 12px;
  max-width: 95%;
  animation: fadeIn 0.3s ease;
}

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

.message.user {
  background: var(--kf-neon);
  color: var(--kf-ink);
  align-self: flex-end;
  font-weight: 500;
  border-bottom-right-radius: 4px;
}

.message.assistant {
  background: var(--bg-secondary);
  align-self: flex-start;
  white-space: pre-wrap;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.8;
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.message.system {
  background: transparent;
  border: 1px solid var(--border);
  align-self: center;
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 10px 20px;
}

.message.loading {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.message.loading::after {
  content: '';
  animation: dots 1.5s infinite;
}

@keyframes dots {
  0%, 20% { content: '.'; }
  40% { content: '..'; }
  60%, 100% { content: '...'; }
}

.chat-form {
  display: flex;
  gap: 12px;
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.chat-form input {
  flex: 1;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
}

.chat-form input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.chat-form input:focus {
  outline: none;
  border-color: var(--kf-neon);
  box-shadow: 0 0 0 3px rgba(228, 255, 90, 0.15);
}

.btn-send {
  padding: 14px 28px;
  background: var(--kf-neon);
  color: var(--kf-ink);
  border: none;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-send:hover {
  background: var(--kf-lime);
  transform: translateY(-1px);
}

.btn-send:active {
  transform: translateY(0);
}

/* Footer */
.footer {
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: rgba(48, 49, 44, 0.95);
}

.footer a {
  color: var(--kf-neon);
  text-decoration: none;
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--kf-lime);
}

.separator {
  margin: 0 16px;
  color: var(--border);
}

.version {
  opacity: 0.6;
}

/* Phase Indicators */
.phase-badge {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(228, 255, 90, 0.15);
  color: var(--kf-neon);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Selection */
::selection {
  background: var(--kf-neon);
  color: var(--kf-ink);
}

/* Responsive */
@media (max-width: 640px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .main {
    padding: 20px 16px;
  }

  .start-panel {
    margin: 16px auto;
    padding: 24px;
    border-radius: 12px;
  }

  .start-panel h2 {
    font-size: 26px;
  }

  .chat-form {
    flex-direction: column;
    padding: 12px;
  }

  .btn-send {
    width: 100%;
  }
}

/* Light Mode Override (for Linen background option) */
.light-mode {
  --bg-primary: var(--kf-linen);
  --bg-secondary: var(--kf-white);
  --bg-tertiary: var(--kf-sage);
  --text-primary: var(--kf-ink);
  --text-secondary: #5a5b55;
  --border: var(--kf-sage);
}