/* =========================================================================
   Helena — Style System
   Inspired by the wireframe colour palette and layout
   ========================================================================= */

/* --- Google Font --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* --- Design Tokens --- */
:root {
  --color-primary:        #66023C;
  --color-primary-dark:   #4A012B;
  --color-primary-glow:   rgba(102, 2, 60, 0.35);
  --color-user-bubble:    #F5E6F0;
  --color-helena-bg:      #FFFFFF;
  --color-helena-border:  #66023C;
  --color-error-border:   #E24B4A;
  --color-error-tag:      #A32D2D;
  --color-body-text:      #1A1A1A;
  --color-secondary-text: #888888;
  --color-page-bg:        #F8F6F7;
  --color-input-bg:       #FAFAFA;
  --color-input-border:   rgba(102, 2, 60, 0.25);
  --color-divider:        rgba(102, 2, 60, 0.12);

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-bubble: 18px;
  --radius-input:  24px;
  --shadow-soft:   0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-header: 0 2px 16px rgba(102, 2, 60, 0.2);
  --transition:    0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: var(--font-main);
  font-size: 16px;
  color: var(--color-body-text);
  background: var(--color-page-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* =========================================================================
   KNOCK SCREEN
   ========================================================================= */

#knock-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  background: linear-gradient(160deg, #7A0348 0%, #66023C 40%, #4A012B 100%);
  cursor: pointer;
  user-select: none;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#knock-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.knock-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.knock-subtitle {
  font-size: 0.9rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.06em;
  margin-bottom: 2.5rem;
}

.knock-divider {
  width: 60px;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
  margin-bottom: 2.5rem;
}

.knock-icon-ring {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  transition: transform 0.15s ease, border-color 0.3s ease;
}

.knock-icon-ring:hover {
  border-color: rgba(255, 255, 255, 0.6);
}

.knock-icon-ring svg {
  width: 36px;
  height: 36px;
  fill: none;
  stroke: rgba(255, 255, 255, 0.75);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.knock-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.45);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 3rem;
}

.knock-hint {
  position: absolute;
  bottom: 2.5rem;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.3);
  letter-spacing: 0.04em;
}

/* Knock animation */
@keyframes knock {
  0%   { transform: scale(1); }
  15%  { transform: scale(0.92) rotate(-3deg); }
  30%  { transform: scale(1.04) rotate(2deg); }
  50%  { transform: scale(0.96) rotate(-1.5deg); }
  70%  { transform: scale(1.02) rotate(0.5deg); }
  85%  { transform: scale(0.99); }
  100% { transform: scale(1); }
}

#knock-screen.knocking .knock-icon-ring {
  animation: knock 0.8s ease forwards;
}

/* Pulse ring on knock */
@keyframes pulse-ring {
  0%   { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.8); opacity: 0; }
}

.knock-pulse {
  position: absolute;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.4);
  pointer-events: none;
  opacity: 0;
}

#knock-screen.knocking .knock-pulse {
  animation: pulse-ring 0.8s ease-out forwards;
}


/* =========================================================================
   CHAT SCREEN
   ========================================================================= */

#chat-screen {
  display: none;               /* shown via JS after knock */
  flex-direction: column;
  height: 100%;
  width: 100%;
  background: var(--color-page-bg);
  opacity: 0;
  transition: opacity 0.4s ease;
}

#chat-screen.visible {
  display: flex;
  opacity: 1;
}

/* --- Header --- */
.chat-header {
  background: var(--color-primary);
  background: linear-gradient(135deg, #7A0348, #66023C);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  box-shadow: var(--shadow-header);
  z-index: 10;
}

.chat-header-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-header-avatar svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: rgba(255, 255, 255, 0.85);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chat-header-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-header-name {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
}

.chat-header-status {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 400;
}

/* --- Messages container --- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}

/* Custom scrollbar */
.chat-messages::-webkit-scrollbar {
  width: 5px;
}
.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}
.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(102, 2, 60, 0.15);
  border-radius: 10px;
}

/* --- Bubbles --- */
.bubble {
  max-width: 80%;
  padding: 12px 16px;
  font-size: 0.9rem;
  line-height: 1.55;
  word-wrap: break-word;
  animation: bubble-in 0.3s ease forwards;
}

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

/* Helena's bubble */
.bubble-helena {
  align-self: flex-start;
  background: var(--color-helena-bg);
  border: 1px solid var(--color-helena-border);
  border-radius: 4px var(--radius-bubble) var(--radius-bubble) var(--radius-bubble);
  box-shadow: var(--shadow-soft);
}

/* User's bubble */
.bubble-user {
  align-self: flex-end;
  background: var(--color-user-bubble);
  border-radius: var(--radius-bubble) 4px var(--radius-bubble) var(--radius-bubble);
}

/* Timestamp */
.bubble-time {
  font-size: 0.65rem;
  color: var(--color-secondary-text);
  margin-top: 4px;
  text-align: right;
}

/* Error bubble */
.bubble-error {
  align-self: flex-start;
  background: var(--color-helena-bg);
  border: 1px solid var(--color-error-border);
  border-radius: 4px var(--radius-bubble) var(--radius-bubble) var(--radius-bubble);
  box-shadow: var(--shadow-soft);
}

.bubble-error .error-tag {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-error-tag);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.bubble-error .error-tag svg {
  width: 12px;
  height: 12px;
  stroke: var(--color-error-tag);
  fill: none;
  stroke-width: 2;
}

.bubble-error .bubble-time {
  color: var(--color-error-tag);
}


/* --- Typing indicator --- */
.typing-indicator {
  align-self: flex-start;
  background: var(--color-helena-bg);
  border: 1px solid var(--color-helena-border);
  border-radius: 4px var(--radius-bubble) var(--radius-bubble) var(--radius-bubble);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 5px;
  box-shadow: var(--shadow-soft);
  animation: bubble-in 0.3s ease forwards;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.35;
  animation: dot-bounce 1.4s ease-in-out infinite;
}

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

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

@keyframes dot-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.35; }
  30%           { transform: translateY(-6px); opacity: 1; }
}


/* --- Input bar --- */
.chat-input-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-top: 1px solid var(--color-divider);
  background: #fff;
  flex-shrink: 0;
}

#message-input {
  flex: 1;
  height: 44px;
  padding: 0 18px;
  font-family: var(--font-main);
  font-size: 0.9rem;
  color: var(--color-body-text);
  background: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-input);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#message-input::placeholder {
  color: var(--color-secondary-text);
}

#message-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

#send-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition), transform 0.15s ease, opacity var(--transition);
}

#send-btn:hover:not(:disabled) {
  background: var(--color-primary-dark);
  transform: scale(1.05);
}

#send-btn:active:not(:disabled) {
  transform: scale(0.95);
}

#send-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
  opacity: 0.6;
}

#send-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}


/* =========================================================================
   RESPONSIVE
   ========================================================================= */

/* Desktop: centered wide chat card */
@media (min-width: 768px) {
  body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, #F5E6F0 0%, #E8D5E0 50%, #F0E0EB 100%);
  }

  #chat-screen.visible {
    display: flex;
    flex-direction: column;
    width: 800px;
    height: 88vh;
    max-height: 780px;
    border-radius: 24px;
    overflow: hidden;
    box-shadow:
      0 20px 60px rgba(102, 2, 60, 0.15),
      0 4px 16px rgba(0, 0, 0, 0.06);
    background: var(--color-page-bg);
  }

  .chat-header {
    border-radius: 24px 24px 0 0;
  }

  /* Wider bubbles on desktop */
  .bubble {
    max-width: 70%;
  }

  .chat-messages {
    padding: 24px 24px;
  }

  .chat-input-bar {
    padding: 14px 24px;
  }
}

/* Mobile: full screen */
@media (max-width: 767px) {
  #chat-screen.visible {
    width: 100%;
    height: 100%;
  }
}