/* ===== Design tokens - MeetMyClone (GitHub Dark + Apple Minimalist) ===== */
:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-elevated: #21262d;
  --color-text: #e6edf3;
  --color-text-secondary: #7d8590;
  --color-text-muted: #484f58;
  --color-accent: #58a6ff;
  --color-accent-hover: #79c0ff;
  --color-accent-green: #238636;
  --color-accent-green-hover: #3fb950;
  --color-user-bubble: #1f6feb;
  --color-user-text: #ffffff;
  --color-ai-bubble: #161b22;
  --color-ai-text: #e6edf3;
  --color-border: #30363d;
  --color-input-bg: #0d1117;
  --color-input-border: #30363d;
  --color-glow: rgba(88, 166, 255, 0.15);
  --color-glow-green: rgba(63, 185, 80, 0.15);
  --glass-bg: rgba(22, 27, 34, 0.8);
  --glass-border: rgba(48, 54, 61, 0.6);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                  "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, "Cascadia Code",
               Menlo, monospace;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;
  --font-size-lg: 18px;
  --font-size-xl: 28px;
  --font-size-2xl: 36px;
  --line-height: 1.6;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 20px;
  --spacing-lg: 32px;
  --spacing-xl: 64px;

  --max-width: 720px;
  --header-height: 64px;
  --border-radius: 14px;
  --border-radius-sm: 10px;
  --border-radius-pill: 24px;

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: var(--line-height);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

/* ===== Header (Glass morphism) ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo-accent {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 600;
}

.nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.nav-link:hover {
  color: var(--color-text);
}

/* ===== Chat container ===== */
.chat-container {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: calc(var(--header-height) + var(--spacing-lg)) var(--spacing-md) 220px;
  overflow-y: auto;
}

/* ===== Welcome screen ===== */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  gap: var(--spacing-md);
}

.welcome-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.accent {
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.welcome-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
}

/* ===== WELCOME MODE: everything vertically centered ===== */
.welcome-mode {
  display: flex;
  flex-direction: column;
}

.welcome-mode {
  height: 100dvh;
}

.welcome-mode .chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding-top: var(--header-height);
  padding-bottom: 0;
  overflow: visible;
}

.welcome-mode .welcome {
  justify-content: flex-end;
  padding-bottom: 0;
}

.welcome-mode .input-area {
  position: static;
  background: none;
  padding: 0 var(--spacing-md);
  padding-top: var(--spacing-md);
  max-width: var(--max-width);
  width: 100%;
}

.welcome-mode .page-footer {
  position: static;
  padding: var(--spacing-md) var(--spacing-md);
}

/* ===== CHAT MODE: input follows messages ===== */
.chat-mode .chat-container {
  display: block;
  padding-bottom: 180px;
}

.chat-mode .welcome {
  display: none;
}

.chat-mode .input-area {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, var(--color-bg) 60%, transparent);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

.chat-mode .suggestions {
  display: none;
}

.chat-mode .page-footer {
  display: none;
}

/* ===== Messages ===== */
.messages {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.message {
  max-width: 85%;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.message--user {
  align-self: flex-end;
  background: var(--color-user-bubble);
  color: var(--color-user-text);
  border-bottom-right-radius: var(--spacing-xs);
}

.message--ai {
  align-self: flex-start;
  background: var(--color-ai-bubble);
  color: var(--color-ai-text);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--spacing-xs);
}

.message--ai a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}

.message--ai a:hover {
  color: var(--color-accent-hover);
}

.message--error {
  border: 1px solid #da3633;
  color: #f85149;
}

.message-content {
  line-height: var(--line-height);
}

.message-content strong {
  font-weight: 600;
  color: var(--color-text);
}

.message-content em {
  font-style: italic;
  color: var(--color-text-secondary);
}

/* ===== Typing indicator ===== */
.typing-indicator {
  display: flex;
  gap: 6px;
  padding: 4px 0;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: var(--color-text-muted);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite;
}

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

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

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-6px);
    opacity: 1;
  }
}

/* ===== Input area (default for chat mode) ===== */
.input-area {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, var(--color-bg) 60%, transparent);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

/* ===== Suggestions ===== */
.suggestions {
  max-width: var(--max-width);
  margin: var(--spacing-sm) auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.suggestion-btn {
  padding: 10px var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-pill);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  transition: all var(--transition);
  white-space: nowrap;
}

.suggestion-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-surface-elevated);
  box-shadow: 0 0 12px var(--color-glow);
}

/* ===== Chat input form (Glass pill) ===== */
.input-form {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  gap: var(--spacing-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius);
  padding: 6px;
}

.chat-input {
  flex: 1;
  padding: 12px var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  outline: none;
}

.chat-input::placeholder {
  color: var(--color-text-muted);
}

.chat-input:focus {
  outline: none;
}

.input-form:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-glow);
}

.chat-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.send-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-green);
  border: none;
  border-radius: var(--border-radius-sm);
  color: white;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
  background: var(--color-accent-green-hover);
  box-shadow: 0 0 12px var(--color-glow-green);
}

.send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Page footer ===== */
.page-footer {
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

.page-footer a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-footer a:hover {
  color: var(--color-text-secondary);
}

/* ===== Honeypot (hidden anti-bot field) ===== */
.hp-field {
  position: absolute;
  left: -9999px;
  top: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
  tab-index: -1;
}

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

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .welcome-title {
    font-size: var(--font-size-xl);
  }

  .welcome-subtitle {
    font-size: var(--font-size-base);
  }

  .suggestions {
    flex-direction: column;
    align-items: stretch;
  }

  .suggestion-btn {
    width: 100%;
    text-align: center;
    white-space: normal;
  }

  .message {
    max-width: 92%;
  }

  .chat-mode .chat-container {
    padding-bottom: 240px;
  }
}

/* ===== CGU page ===== */
.cgu-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
}

.cgu-container h1 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.cgu-container h2 {
  font-size: var(--font-size-lg);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.cgu-container h3 {
  font-size: var(--font-size-base);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.cgu-container p,
.cgu-container li {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.cgu-container ul {
  padding-left: var(--spacing-lg);
}

.cgu-container .update-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
}