/* ==========================================================
   SAT Math Practice Chat Widget
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,400&family=Syne:wght@400;600;700;800&display=swap');

:root {
  --smp-bg:        #0c0e14;
  --smp-surface:   #13161f;
  --smp-surface2:  #1c2030;
  --smp-border:    rgba(255,255,255,0.07);
  --smp-accent:    #5b8cff;
  --smp-accent2:   #a78bfa;
  --smp-green:     #34d399;
  --smp-red:       #f87171;
  --smp-text:      #e8eaf0;
  --smp-muted:     #6b7280;
  --smp-user-bg:   #1e2d4a;
  --smp-ai-bg:     #151822;
  --smp-radius:    16px;
  --smp-shadow:    0 32px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.05);
  --smp-font:      'Syne', sans-serif;
  --smp-mono:      'DM Mono', monospace;
  --smp-w:         480px;
  --smp-h:         600px;
}

/* ---- Launcher ---- */
.smp-launcher {
  position: relative;
  display: inline-block;
  font-family: var(--smp-font);
}

.smp-open-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--smp-accent), var(--smp-accent2));
  color: #fff;
  border: none;
  border-radius: 50px;
  font-family: var(--smp-font);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 24px rgba(91,140,255,0.35);
}

.smp-open-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(91,140,255,0.5);
}

.smp-btn-icon {
  font-size: 18px;
  animation: smp-spin 6s linear infinite;
}

@keyframes smp-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ---- Dialog ---- */
.smp-dialog {
  position: fixed;
  bottom: 80px;
  right: 24px;
  width: var(--smp-w);
  max-width: calc(100vw - 48px);
  height: var(--smp-h);
  max-height: calc(100vh - 120px);
  background: var(--smp-bg);
  border: 1px solid var(--smp-border);
  border-radius: var(--smp-radius);
  box-shadow: var(--smp-shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 999999;
  animation: smp-appear 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.smp-dialog[hidden] {
  display: none !important;
}

@keyframes smp-appear {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---- Header ---- */
.smp-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--smp-surface);
  border-bottom: 1px solid var(--smp-border);
  flex-shrink: 0;
}

.smp-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.smp-avatar {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--smp-accent), var(--smp-accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.smp-dialog-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--smp-text);
  letter-spacing: 0.01em;
}

.smp-dialog-subtitle {
  font-size: 11px;
  color: var(--smp-muted);
  font-family: var(--smp-mono);
  margin-top: 1px;
}

.smp-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.smp-difficulty-select {
  background: var(--smp-surface2);
  color: var(--smp-text);
  border: 1px solid var(--smp-border);
  border-radius: 8px;
  padding: 4px 8px;
  font-family: var(--smp-mono);
  font-size: 11px;
  cursor: pointer;
  outline: none;
}

.smp-difficulty-select:focus {
  border-color: var(--smp-accent);
}

.smp-new-chat,
.smp-close-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--smp-border);
  background: var(--smp-surface2);
  color: var(--smp-muted);
  cursor: pointer;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.smp-new-chat:hover,
.smp-close-btn:hover {
  background: var(--smp-accent);
  color: #fff;
  border-color: var(--smp-accent);
}

/* ---- Messages ---- */
.smp-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

.smp-messages::-webkit-scrollbar { width: 4px; }
.smp-messages::-webkit-scrollbar-track { background: transparent; }
.smp-messages::-webkit-scrollbar-thumb { background: var(--smp-border); border-radius: 4px; }

/* Welcome screen */
.smp-welcome {
  text-align: center;
  padding: 20px 10px;
  animation: smp-fade-in 0.4s ease;
}

.smp-welcome-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

.smp-welcome h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--smp-text);
  margin: 0 0 8px;
}

.smp-welcome p {
  font-size: 13px;
  color: var(--smp-muted);
  margin: 0 0 16px;
  font-family: var(--smp-mono);
}

.smp-welcome em {
  color: var(--smp-accent);
  font-style: normal;
}

.smp-quick-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.smp-quick {
  background: var(--smp-surface2);
  color: var(--smp-text);
  border: 1px solid var(--smp-border);
  border-radius: 20px;
  padding: 7px 14px;
  font-family: var(--smp-mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

.smp-quick:hover {
  background: var(--smp-accent);
  border-color: var(--smp-accent);
  color: #fff;
  transform: translateY(-1px);
}

/* Message bubbles */
.smp-msg {
  display: flex;
  flex-direction: column;
  max-width: 88%;
  animation: smp-fade-in 0.25s ease;
}

.smp-msg.user {
  align-self: flex-end;
  align-items: flex-end;
}

.smp-msg.ai {
  align-self: flex-start;
  align-items: flex-start;
}

.smp-msg-label {
  font-size: 10px;
  font-family: var(--smp-mono);
  color: var(--smp-muted);
  margin-bottom: 4px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.smp-msg-bubble {
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--smp-text);
  word-break: break-word;
}

.smp-msg.user .smp-msg-bubble {
  background: var(--smp-user-bg);
  border: 1px solid rgba(91,140,255,0.2);
  border-bottom-right-radius: 4px;
}

.smp-msg.ai .smp-msg-bubble {
  background: var(--smp-ai-bg);
  border: 1px solid var(--smp-border);
  border-bottom-left-radius: 4px;
  font-family: var(--smp-mono);
  font-size: 13.5px;
}

/* Correct/incorrect highlights */
.smp-msg.ai .smp-msg-bubble strong {
  color: var(--smp-accent2);
}

/* Typing indicator */
.smp-typing-indicator {
  padding: 0 20px 8px;
  display: flex;
  gap: 5px;
  align-items: center;
  flex-shrink: 0;
}

.smp-typing-indicator[hidden] { display: none !important; }

.smp-typing-indicator span {
  width: 7px;
  height: 7px;
  background: var(--smp-accent);
  border-radius: 50%;
  animation: smp-bounce 1.2s infinite;
}

.smp-typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.smp-typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

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

/* ---- Input Row ---- */
.smp-input-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 14px 16px;
  background: var(--smp-surface);
  border-top: 1px solid var(--smp-border);
  flex-shrink: 0;
}

.smp-input {
  flex: 1;
  background: var(--smp-surface2);
  border: 1px solid var(--smp-border);
  border-radius: 12px;
  color: var(--smp-text);
  font-family: var(--smp-mono);
  font-size: 13px;
  padding: 11px 14px;
  resize: none;
  outline: none;
  line-height: 1.5;
  transition: border-color 0.15s;
  min-height: 44px;
  max-height: 120px;
  overflow-y: auto;
}

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

.smp-input:focus {
  border-color: var(--smp-accent);
  box-shadow: 0 0 0 3px rgba(91,140,255,0.15);
}

.smp-send-btn {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--smp-accent), var(--smp-accent2));
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}

.smp-send-btn svg {
  width: 16px;
  height: 16px;
}

.smp-send-btn:hover:not(:disabled) {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(91,140,255,0.4);
}

.smp-send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* ---- Error message ---- */
.smp-error {
  background: rgba(248,113,113,0.1);
  border: 1px solid rgba(248,113,113,0.3);
  color: var(--smp-red);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  font-family: var(--smp-mono);
  align-self: center;
  text-align: center;
  max-width: 90%;
}

/* ---- Utilities ---- */
@keyframes smp-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Mobile ---- */
@media (max-width: 520px) {
  .smp-dialog {
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    max-width: 100%;
    height: 92vh;
    border-radius: var(--smp-radius) var(--smp-radius) 0 0;
  }

  .smp-open-btn {
    padding: 12px 22px;
    font-size: 14px;
  }
}