:root {
  --bg-overlay: linear-gradient(145deg, rgba(6, 10, 20, 0.84), rgba(22, 28, 46, 0.74));
  --card-bg: rgba(255, 255, 255, 0.1);
  --card-bg-strong: rgba(10, 14, 26, 0.78);
  --text-primary: #f8faff;
  --text-secondary: #c4d0f8;
  --accent: #6f8cff;
  --accent-strong: #506cff;
  --success: #3dd09a;
  --danger: #f97284;
  --radius-lg: 18px;
  --radius-md: 12px;
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.35);
  --shadow-sm: 0 6px 20px rgba(0, 0, 0, 0.2);
}

body {
  color: var(--text-primary);
  font-family: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: -1;
  pointer-events: none;
}

.app-title-unused {
  margin: 1.5rem auto 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: clamp(1rem, 2vw, 1.4rem) !important;
  color: #fff;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.65);
}

.app-title-unused span {
  display: inline-block;
  margin-top: 0.45rem;
  font-family: "Inter", sans-serif;
  font-size: 0.9rem;
  text-transform: none;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
}

#form-id > .text-center > .container,
#update_all,
.card,
.modal-content {
  background: var(--card-bg);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(7px);
}

h1, h2, h3, h4, h5, h6,
label,
p,
span,
li,
small,
legend {
  color: var(--text-primary);
}

select,
textarea,
input[type="text"],
input[type="url"],
input[type="number"],
input[type="search"] {
  background: rgba(255, 255, 255, 0.95) !important;
  color: #10213d !important;
  border: 1px solid rgba(82, 104, 179, 0.3) !important;
  border-radius: var(--radius-md) !important;
  box-shadow: var(--shadow-sm);
}

button,
.btn {
  border: none;
  border-radius: 999px !important;
  padding: 0.5rem 1rem;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

button:hover,
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(80, 108, 255, 0.3);
  filter: brightness(1.06);
}

.btn-primary,
button[name="NEXT"],
button[name="translate"] {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong)) !important;
  color: #fff !important;
}

.btn-danger,
button[onclick*="reset"],
button[onclick*="clear"] {
  background: linear-gradient(135deg, #ff7f93, var(--danger)) !important;
  color: #fff !important;
}

.btn-success {
  background: linear-gradient(135deg, #4edfab, var(--success)) !important;
  color: #fff !important;
}

.nav-tabs .nav-link {
  color: var(--text-secondary);
  border: 1px solid transparent;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.nav-tabs .nav-link.active {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

#wiktionaryModal .modal-content {
  background: var(--card-bg-strong) !important;
}

.help-popup {
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
}

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

::-webkit-scrollbar-thumb {
  background: rgba(138, 158, 255, 0.6);
  border-radius: 999px;
}

@media (max-width: 768px) {
  .app-title-unused {
    margin-top: 1rem;
  }

  button,
  .btn {
    width: 100%;
    margin-bottom: 0.45rem;
  }
}


.vm-quick-controls {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin: 0.35rem 0 1rem;
}

#theme-quick-toggle {
  background: rgba(13, 18, 33, 0.68);
  color: #e6ecff;
  border: 1px solid rgba(149, 168, 255, 0.45) !important;
  box-shadow: var(--shadow-sm);
}

#global-loading-indicator {
  position: fixed;
  left: 50%;
  top: 14px;
  transform: translateX(-50%);
  z-index: 1500;
  background: rgba(7, 12, 23, 0.92);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

#global-loading-indicator.is-visible {
  opacity: 1;
}

@media (max-width: 768px) {
  .vm-quick-controls {
    flex-direction: column;
    align-items: center;
  }
}


/* module organization */
.module-mobile-switcher {
  display: none;
  margin: 0.25rem auto 0.65rem;
  width: min(100%, 620px);
}

.module-mobile-switcher label {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: left;
}

#mobile-module-select {
  width: 100%;
  border-radius: 10px !important;
  background: rgba(255, 255, 255, 0.96) !important;
  color: #122444 !important;
}

.top-tab-container {
  scrollbar-width: thin;
}

.top-tab-container::-webkit-scrollbar {
  height: 8px;
}

#vm-auth-box {
  top: 4px !important;
  right: 10px !important;
  z-index: 2200 !important;
}

@media (max-width: 900px) {
  .module-mobile-switcher {
    display: block;
  }

  .top-tab-container {
    position: sticky;
    top: 40px;
    z-index: 1100;
    backdrop-filter: blur(4px);
  }

  .top-tab-button {
    font-size: 0.84rem;
    padding: 7px 10px;
  }

  #vm-auth-box {
    top: 2px !important;
    right: 6px !important;
    transform: scale(0.92);
    transform-origin: top right;
  }
}


/* clearer separation: module/header vs word buttons */
.top-tab-button {
  background: rgba(8, 24, 44, 0.92) !important;
  color: #dbe9ff !important;
  border: 2px solid #5fa4ff !important;
}

.top-tab-button.active {
  background: linear-gradient(135deg, #ffd166, #f59e0b) !important;
  color: #1f1300 !important;
  border-color: #ffe29a !important;
}

.word-button-container .btn,
button[id^="btn_JS"] {
  background: linear-gradient(135deg, #5f84ff, #4d67d9) !important;
  color: #ffffff !important;
  border: 1px solid #b7c8ff !important;
}

.word-button-container .btn:hover,
button[id^="btn_JS"]:hover {
  background: linear-gradient(135deg, #6f95ff, #5d75e8) !important;
}

/* keep login at top and avoid blocking module buttons */
#vm-auth-box {
  position: fixed !important;
  top: 8px !important;
  right: 10px !important;
  z-index: 2200 !important;
}

.top-tab-container {
  padding-right: 230px !important;
}

@media (max-width: 900px) {
  .top-tab-container {
    padding-right: 0 !important;
  }

  #vm-auth-box {
    top: 6px !important;
    right: 8px !important;
  }
}


/* =============================
   Auth + top utility row
   Keep login next to theme toggle
   ============================= */
.vm-quick-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

#vm-auth-box {
  position: static !important;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: rgba(229, 231, 235, 0.96);
  padding: 6px 12px;
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
}

#vm-user-status {
  font-size: 13px;
  color: #111827;
  font-weight: 500;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.vm-user-photo {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  object-fit: cover;
  border: 2px solid #fff;
}

#vm-auth-box button {
  border: none;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 13px;
  cursor: pointer;
}

#vm-open-login { background: #0a6a59; color: #fff; }
#vm-logout-btn { background: #d1d5db; color: #111827; }

.vm-login-backdrop { position: fixed; inset: 0; background: rgba(15,23,42,.45); display: flex; align-items: center; justify-content: center; z-index: 999; }
.vm-login-hidden { display: none; }
.vm-login-card { position: relative; background: #fff; padding: 24px 28px; border-radius: 16px; box-shadow: 0 18px 50px rgba(0,0,0,.25); max-width: 380px; width: 100%; font-family: system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; }
.vm-login-card h2 { margin: 0 0 8px; font-size: 22px; color:#101828 !important; }
.vm-login-card p { margin: 0 0 16px; color: #555 !important; font-size: 14px; }
.vm-login-close { position: absolute; top: 14px; right: 18px; cursor: pointer; font-size: 20px; color: #9ca3af; background: none; border: none; }
.vm-login-btn { width: 100%; border: none; border-radius: 8px; padding: 9px 12px; font-size: 14px; font-weight: 600; cursor: pointer; }
.vm-login-btn-google { background:#fff; border:1px solid #d1d5db; display:flex; align-items:center; justify-content:center; gap:8px; margin-bottom:12px; }
.vm-login-btn-google img { width: 18px; height: 18px; }
.vm-login-divider { text-align:center; margin:14px 0; font-size:12px; color:#9ca3af !important; position:relative; }
.vm-login-divider::before, .vm-login-divider::after { content:""; position:absolute; top:50%; width:38%; height:1px; background:#e5e7eb; }
.vm-login-divider::before { left: 0; } .vm-login-divider::after { right:0; }
.vm-login-input { width:100%; padding:8px 10px; margin-bottom:8px; border-radius:8px; border:1px solid #d1d5db; font-size:14px; }
.vm-login-btn-primary { background:#145b9e; color:#fff; margin-top:4px; }
.vm-login-btn-secondary { background:#0a6a59; color:#fff; margin-top:6px; }
#vm-login-error { color:#b91c1c !important; font-size:12px; min-height:16px; margin-top:4px; }

/* =============================
   Conversation Builder v2
   ============================= */
.conversation-v2-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  width: min(1100px, 96%);
  margin: 0 auto;
}

.conversation-v2-card {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 12px;
  padding: 12px;
  text-align: left;
}

.conversation-v2-card h4 { margin: 0 0 8px; }
.conversation-v2-row { display:flex; gap:8px; margin-top:8px; }
#cbv2-input { min-height: 140px; width: 100%; }
#cbv2-output { margin: 0; padding-left: 1.15rem; }

@media (max-width: 900px) {
  .conversation-v2-grid { grid-template-columns: 1fr; }
  #vm-user-status { max-width: 130px; }
}

.top-tab-container {
  padding-right: 0 !important;
}


/* =============================
   Prevent stroke/shadow overlap in auth pill
   ============================= */
#vm-auth-box,
#vm-auth-box * {
  text-shadow: none !important;
  -webkit-text-stroke: 0 !important;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif !important;
}

#vm-user-status {
  letter-spacing: normal !important;
  font-weight: 600;
}


/* =============================
   Conversation Builder v2 interactions
   ============================= */
.cbv2-note {
  margin: 10px 0 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.cbv2-word-info {
  min-height: 34px;
  background: rgba(10, 20, 40, 0.4);
  border: 1px solid rgba(180, 206, 255, 0.3);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  color: #e7efff;
}

.cbv2-reply-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.55rem;
}

.cbv2-reply-text {
  flex: 1;
  line-height: 1.5;
}

.cbv2-copy-reply {
  background: linear-gradient(135deg, #2dd4bf, #14b8a6) !important;
  color: #052b28 !important;
  font-weight: 700;
}

.cbv2-word {
  display: inline;
  border: none;
  background: transparent;
  color: #f8fcff;
  text-decoration: underline dotted rgba(186, 207, 255, 0.8);
  text-underline-offset: 2px;
  padding: 0 1px;
  margin: 0;
  font: inherit;
  cursor: pointer;
}

.cbv2-word:hover {
  color: #9fe4ff;
}


/* =============================
   Module 4 saved sessions
   ============================= */
.module4-session-controls {
  display: grid;
  grid-template-columns: 1.3fr auto 1fr auto;
  gap: 0.5rem;
  width: min(1100px, 96%);
  margin: 0.7rem auto;
}

#module4-session-name,
#module4-session-select {
  width: 100%;
  border-radius: 10px !important;
}

@media (max-width: 900px) {
  .module4-session-controls {
    grid-template-columns: 1fr;
  }
}

/* fix copy button stroke overlap */
.cbv2-copy-reply,
.cbv2-copy-reply * {
  text-shadow: none !important;
  -webkit-text-stroke: 0 !important;
  letter-spacing: normal !important;
}

.module4-session-status {
  min-height: 1.2rem;
  margin: 0.25rem auto 0.5rem;
  width: min(1100px, 96%);
  font-weight: 600;
  text-align: left;
}