@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

:root {
  color-scheme: light dark;
  --bg-gradient: radial-gradient(circle at top, #f3f4ff, #eef2ff 40%, #dbeafe);
  --surface-glass: rgba(255, 255, 255, 0.75);
  --surface-elevated: rgba(255, 255, 255, 0.9);
  --surface-dark: rgba(17, 24, 39, 0.7);
  --border-color: rgba(148, 163, 184, 0.3);
  --accent: #6366f1;
  --accent-strong: #4338ca;
  --danger: #ef4444;
  --text-primary: #111827;
  --text-secondary: #475569;
  --text-inverse: #f8fafc;
  --shadow-lg: 0 20px 45px rgba(79, 70, 229, 0.15);
  --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.12);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg-gradient), #f8fafc;
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  padding: 48px 16px;
}

.no-js {
  max-width: 480px;
  margin: 32px auto;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  background: var(--surface-elevated);
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
  line-height: 1.5;
  text-align: center;
  color: var(--text-secondary);
}

.app-shell {
  width: min(1200px, 100%);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 28px;
  backdrop-filter: blur(18px);
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-content: center;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-inverse);
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: inset 0 1px 6px rgba(255, 255, 255, 0.35);
}

.brand-text h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
}

.brand-text p {
  margin: 4px 0 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.header-actions {
  display: flex;
  gap: 12px;
}

.ghost-button,
.primary-button {
  border-radius: var(--radius-sm);
  border: none;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease,
    color 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.ghost-button {
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent-strong);
  border: 1px solid rgba(99, 102, 241, 0.24);
}

.ghost-button:hover {
  background: rgba(99, 102, 241, 0.18);
}

.ghost-button.danger {
  color: var(--danger);
  border-color: rgba(248, 113, 113, 0.3);
  background: rgba(248, 113, 113, 0.08);
}

.ghost-button.danger:hover {
  background: rgba(248, 113, 113, 0.15);
}

.primary-button {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--text-inverse);
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.25);
}

.primary-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px rgba(99, 102, 241, 0.3);
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
  transform: none;
  box-shadow: none;
}

.chat-layout {
  display: flex;
}

.chat-panel {
  flex: 1;
}

.messages {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.messages::-webkit-scrollbar {
  width: 10px;
}

.messages::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 999px;
}

.welcome-card {
  align-self: center;
  max-width: 520px;
  text-align: center;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: var(--accent-strong);
  box-shadow: 0 18px 32px rgba(99, 102, 241, 0.2);
}

.welcome-card h2 {
  margin: 0 0 12px;
  font-size: 1.45rem;
}

.welcome-card p {
  margin: 0;
  line-height: 1.6;
  color: var(--text-secondary);
}

.message {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: flex-start;
  animation: messageIn 0.24s ease;
}

.message__avatar {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-content: center;
  font-weight: 600;
  font-size: 0.95rem;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-strong);
}

.message--assistant .message__avatar {
  background: rgba(16, 185, 129, 0.15);
  color: #0f766e;
}

.message--user .message__bubble {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--text-inverse);
  border-bottom-right-radius: 4px;
  box-shadow: 0 12px 26px rgba(99, 102, 241, 0.25);
}

.message--assistant .message__bubble {
  background: rgba(15, 23, 42, 0.85);
  color: var(--text-inverse);
  border-bottom-left-radius: 4px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.25);
}

.message__bubble {
  border-radius: 18px;
  padding: 16px 18px;
  font-size: 0.98rem;
  line-height: 1.58;
  letter-spacing: 0.01em;
  position: relative;
  transition: background 0.24s ease;
}

.message__meta {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
  opacity: 0.65;
}

.message__content {
  white-space: pre-wrap;
}

.message--streaming .message__bubble::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px dashed rgba(255, 255, 255, 0.25);
  animation: pulse 1.2s ease-in-out infinite;
}

.message--error .message__bubble {
  background: rgba(248, 113, 113, 0.15);
  color: #7f1d1d;
  border: 1px solid rgba(248, 113, 113, 0.4);
}

.composer {
  padding: 24px 28px 28px;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.composer-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.composer-input {
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 12px;
  background: rgba(248, 250, 252, 0.75);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

.composer-input:focus-within {
  border-color: rgba(99, 102, 241, 0.75);
  box-shadow: 0 12px 32px rgba(99, 102, 241, 0.2);
}

.composer textarea {
  border: none;
  resize: vertical;
  min-height: 58px;
  max-height: 240px;
  font-size: 1rem;
  line-height: 1.6;
  font-family: inherit;
  background: transparent;
  color: inherit;
}

.composer textarea:focus {
  outline: none;
}

.composer-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.status-indicator {
  min-height: 24px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.status-indicator::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: transparent;
  transition: background 0.2s ease;
}

.status-indicator.is-streaming {
  color: var(--accent-strong);
}

.status-indicator.is-streaming::before {
  background: var(--accent);
  animation: blink 1.2s ease-in-out infinite;
}

.access-gate {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  background: rgba(15, 23, 42, 0.48);
  backdrop-filter: blur(18px);
  z-index: 1000;
}

.access-gate[hidden] {
  display: none;
}

.access-gate__card {
  width: min(420px, 100%);
  padding: 32px 32px 36px;
  border-radius: var(--radius-lg);
  background: rgba(248, 250, 252, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 20px;
  text-align: left;
  color: var(--text-primary);
}

.access-gate__card h2 {
  margin: 0;
  font-size: 1.4rem;
}

.access-gate__description {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.access-gate__form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.access-gate__label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-strong);
}

.access-gate__input {
  border-radius: var(--radius-sm);
  border: 1px solid rgba(148, 163, 184, 0.45);
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

.access-gate__input:focus {
  outline: 2px solid rgba(99, 102, 241, 0.4);
  border-color: transparent;
}

.access-gate__error {
  margin: 0;
  font-size: 0.9rem;
  color: var(--danger);
}

.access-gate__button {
  justify-content: center;
  width: 100%;
}

.settings-dialog {
  border: none;
  border-radius: var(--radius-lg);
  max-width: 420px;
  width: 92%;
  padding: 0;
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-primary);
}

.settings-dialog::backdrop {
  background: rgba(15, 23, 42, 0.45);
}

.settings-dialog header {
  padding: 22px 26px 10px;
}

.settings-field {
  padding: 0 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-field input {
  border-radius: var(--radius-sm);
  border: 1px solid rgba(148, 163, 184, 0.45);
  padding: 12px 14px;
  font-size: 0.95rem;
}

.settings-field input:focus {
  outline: 2px solid rgba(99, 102, 241, 0.4);
  border-color: transparent;
}

.field-hint {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0;
}

.settings-actions {
  padding: 18px 26px 24px;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(248, 250, 252, 0.8);
  border-bottom-left-radius: inherit;
  border-bottom-right-radius: inherit;
}

@keyframes messageIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    opacity: 0.4;
  }
  50% {
    opacity: 0.1;
  }
  100% {
    opacity: 0.4;
  }
}

@keyframes blink {
  0%,
  100% {
    opacity: 0.2;
  }
  50% {
    opacity: 1;
  }
}

.typing-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: inherit;
}

.typing-indicator__dots {
  display: inline-flex;
  gap: 4px;
}

.typing-indicator__dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: currentColor;
  opacity: 0.2;
  animation: typing 1.2s infinite ease-in-out;
}

.typing-indicator__dot:nth-child(2) {
  animation-delay: 0.18s;
}

.typing-indicator__dot:nth-child(3) {
  animation-delay: 0.36s;
}

@keyframes typing {
  0%,
  100% {
    opacity: 0.2;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

@media (max-width: 640px) {
  body {
    padding: 24px 10px;
  }

  .app-header,
  .chat-panel {
    border-radius: 18px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .messages {
    padding: 24px 20px;
  }

  .composer {
    padding: 20px;
  }
}