:root {
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-reader: "Georgia", "Merriweather", "Charter", serif;
  --transition: 0.2s ease;
  --safe-bottom: env(safe-area-inset-bottom, 16px);
  --safe-top: env(safe-area-inset-top, 0px); /* notch / Dynamic Island / status bar */
  --reader-font-size: 1.15rem;
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --panel-bg: #ffffff;
  --panel-blur: rgba(255, 255, 255, 0.94);
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-active: #1d4ed8;
  --highlight: rgba(254, 215, 10, 0.42);
  --word-active: #0284c7;
  --word-text: #ffffff;
  --tab-active-bg: #f1f5f9;
  --drawer-bg: #e2ecf5;
  --drawer-item-hover: #d2e3f3;
  --modal-overlay: rgba(15, 23, 42, 0.6);
}

[data-theme="sepia"] {
  --bg-main: #f4ecd8;
  --panel-bg: #eae0c8;
  --panel-blur: rgba(234, 224, 200, 0.94);
  --text-main: #42321e;
  --text-muted: #7d674c;
  --border: #d4c4a8;
  --accent: #b45309;
  --accent-active: #92400e;
  --highlight: rgba(217, 119, 6, 0.3);
  --word-active: #78350f;
  --word-text: #ffffff;
  --tab-active-bg: #dfceb0;
  --drawer-bg: #dfd4bc;
  --drawer-item-hover: #d2c5a9;
  --modal-overlay: rgba(66, 50, 30, 0.6);
}

[data-theme="dark"] {
  --bg-main: #0b1120;
  --panel-bg: #151e32;
  --panel-blur: rgba(21, 30, 50, 0.94);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #23314e;
  --accent: #38bdf8;
  --accent-active: #0284c7;
  --highlight: rgba(56, 189, 248, 0.25);
  --word-active: #38bdf8;
  --word-text: #0b1120;
  --tab-active-bg: #1e293b;
  --drawer-bg: #111a2d;
  --drawer-item-hover: #1b2844;
  --modal-overlay: rgba(0, 0, 0, 0.78);
}

[data-theme="oled"] {
  --bg-main: #000000;
  --panel-bg: #0d0d0d;
  --panel-blur: rgba(13, 13, 13, 0.96);
  --text-main: #ededed;
  --text-muted: #737373;
  --border: #262626;
  --accent: #10b981;
  --accent-active: #059669;
  --highlight: rgba(16, 185, 129, 0.28);
  --word-active: #10b981;
  --word-text: #000000;
  --tab-active-bg: #222222;
  --drawer-bg: #080808;
  --drawer-item-hover: #181818;
  --modal-overlay: rgba(0, 0, 0, 0.9);
}

* { box-sizing: border-box; margin: 0; padding: 0; touch-action: manipulation; }

html {
  height: 100%;
  overflow: hidden; /* the page never scrolls; only <main> does */
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-ui);
  height: 100vh;   /* fallback for old browsers */
  height: 100dvh;  /* iPhone: exactly the visible area, even as the browser toolbar shows/hides */
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition), color var(--transition);
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

/* TOP HEADER */
/* No blur, glow or filters anywhere in the header (forced, so no other rule can bring them back) */
header, header * {
  -webkit-backdrop-filter: none !important;
  backdrop-filter: none !important;
  filter: none !important;
  text-shadow: none !important;
}

header {
  padding: calc(0.9rem + var(--safe-top)) 0.85rem 0.6rem;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
  position: relative;
  flex: 0 0 auto;
  z-index: 50;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.4rem;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
}

.menu-toggle-btn {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.2rem 0.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-header {
  background: var(--bg-main);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
  transition: border-color var(--transition);
}
.btn-header:hover { border-color: var(--accent); }

.btn-open-doc {
  background: var(--accent);
  color: #fff !important;
  border: none;
  font-weight: 600;
}

.btn-summarize {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(168, 85, 247, 0.12));
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.credit-badge {
  font-size: 0.76rem;
  padding: 0.3rem 0.55rem;
  border-radius: 20px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid var(--border);
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
  user-select: none;
  transition: background-color var(--transition);
}
.credit-badge:hover { background: rgba(56, 189, 248, 0.2); }

.user-avatar-mini {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
}

/* CONTROLS PANEL */
.controls-panel {
  max-width: 860px;
  width: calc(100% - 1.2rem);
  margin: 0.5rem auto 0;
  padding: 0.65rem 0.85rem;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex: 0 0 auto;
  max-height: 40dvh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.controls-toggle-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.controls-collapsible {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.controls-collapsible.collapsed { display: none; }

.engine-tabs-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: 2px;
}
.engine-tabs-group::-webkit-scrollbar { display: none; }

.engine-tab {
  background: var(--bg-main);
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.3rem 0.65rem;
  border-radius: 16px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
}

.engine-tab.active {
  background: var(--tab-active-bg);
  color: var(--text-main);
  border-color: var(--accent);
  font-weight: 600;
  box-shadow: 0 0 0 1px var(--accent);
}

.settings-sub-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.setting-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex: 1;
  min-width: 140px;
}

.setting-group select {
  flex: 1;
  width: 100%;
  background: var(--bg-main);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  font-size: 16px;
}

/* READING CONTAINER */
main {
  flex: 1 1 auto;
  min-height: 0;            /* required so a flex child can shrink and scroll */
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 0.6rem 0;
}

main::after {
  content: '';
  flex: 0 0 calc(110px + var(--safe-bottom)); /* clears the fixed player bar so the last lines are never hidden */
}

.reader-card {
  max-width: 860px;
  width: 100%;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  min-height: calc(100dvh - 250px);
  flex-shrink: 0; /* never squash the card; its text must stay inside so the page can scroll to the end */
  position: relative;
}

@media (min-width: 641px) {
  .reader-card { padding: 2.5rem 2.2rem; }
}

.doc-meta {
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.book-content {
  font-family: var(--font-reader);
  font-size: var(--reader-font-size);
  line-height: 1.9;
  letter-spacing: 0.01rem;
  user-select: text;
}

.sentence {
  padding: 2px 3px;
  border-radius: 4px;
  transition: background-color 0.15s ease;
  cursor: pointer;
  text-decoration: none !important;
  border: none !important;
}

.sentence.active-sentence {
  background-color: var(--highlight) !important;
  color: inherit;
}

.word {
  display: inline-block;
  border-radius: 3px;
  padding: 0 1px;
  transition: background-color 0.08s ease, color 0.08s ease;
}

.word.active-word {
  background-color: var(--word-active) !important;
  color: var(--word-text) !important;
  font-weight: 600;
  border-radius: 3px;
}

/* INLINE DIAGRAM CARDS */
.reader-diagram {
  margin: 1.4rem auto;
  max-width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.reader-diagram img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  background: #ffffff;
  display: block;
}

.diagram-toolbar {
  padding: 0.6rem 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  background: var(--panel-bg);
  border-top: 1px solid var(--border);
}

.diagram-caption {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-explain-diagram {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}

/* FLOATING TEXT SELECTION POPOVER */
.selection-popover {
  position: absolute;
  display: none;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  border-radius: 8px;
  padding: 0.3rem;
  z-index: 90;
  gap: 0.25rem;
  align-items: center;
  transform: translate(-50%, -100%);
}

.btn-popover-action {
  background: var(--bg-main);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 0.3rem 0.55rem;
  border-radius: 6px;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  white-space: nowrap;
}
.btn-popover-action:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* BOTTOM PLAYER */
.mobile-player-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--panel-bg); /* solid: no see-through blur */
  border-top: 1px solid var(--border);
  padding: 0.55rem 0.85rem calc(0.55rem + var(--safe-bottom));
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.player-nav-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.player-btn-main {
  background: var(--accent);
  color: #fff;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.2);
}
.player-btn-main:active { transform: scale(0.95); }

.player-btn-nav {
  background: var(--bg-main);
  color: var(--text-main);
  border: 1px solid var(--border);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  padding: 0;
  cursor: pointer;
}

.player-status-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  user-select: none;
  padding: 0.2rem 0.6rem;
  border-radius: 8px;
  transition: background-color 0.15s ease;
  max-width: 42%;
}
.player-status-group:hover, .player-status-group:active {
  background: rgba(56, 189, 248, 0.12);
}

.speed-pill-btn {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.55rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-main);
  color: var(--text-main);
  cursor: pointer;
}

.player-right-group {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.3rem;
  flex-shrink: 0;
}

.sleep-timer-btn.active {
  border-color: var(--accent);
  color: var(--accent);
}

#pageIndicatorText {
  white-space: nowrap;
}

#chapterIndicatorText {
  max-width: 130px;
}

/* DRAWER */
.drawer-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.drawer-overlay.active { opacity: 1; pointer-events: auto; }
.drawer-overlay {
  touch-action: none;                    /* dragging on the dim area must not scroll the reader behind it */
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.side-drawer {
  position: fixed;
  top: 0; bottom: 0; left: -310px;
  width: 290px;
  max-width: 85vw;
  background: var(--drawer-bg);
  color: var(--text-main);
  z-index: 210;
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 25px rgba(0, 0, 0, 0.35);
  transition: transform var(--transition);
}
.side-drawer.open { transform: translateX(310px); }
.side-drawer {
  will-change: transform;                /* smoother slide on phones */
  overscroll-behavior: contain;
}
.drawer-body { overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }

.drawer-header {
  height: calc(155px + var(--safe-top));
  padding-top: var(--safe-top);
  background: linear-gradient(180deg, #182848 0%, #29487d 65%, #3d669e 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: pointer;
}

.scenic-moon {
  position: absolute;
  top: calc(var(--safe-top) + 16px); /* start below the notch / status bar so the whole moon shows */
  right: 42px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  box-shadow: -10px 10px 0 2px #dbe7f5;
  transform: rotate(-12deg);
  opacity: 1;
}

.star { position: absolute; background: #fff; border-radius: 50%; opacity: 0.6; }

.drawer-user-info {
  position: absolute;
  bottom: 14px;
  left: 18px;
  right: 18px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.drawer-header-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.drawer-header-subtitle {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.78);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem 0;
  display: flex;
  flex-direction: column;
}

.drawer-nav-item {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 0.85rem 1.4rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
}
.drawer-nav-item:hover, .drawer-nav-item:active { background: var(--drawer-item-hover); }

.drawer-footer {
  border-top: 1px solid var(--border);
  padding: 0.65rem 0.85rem calc(0.65rem + var(--safe-bottom));
  display: flex;
  justify-content: space-around;
  align-items: center;
  background: var(--panel-bg);
}

.drawer-quick-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  cursor: pointer;
  background: transparent;
  border: none;
  padding: 0.35rem 0.45rem;
}
.drawer-quick-btn span.icon { font-size: 1.15rem; color: var(--text-main); }

/* MODAL ARCHITECTURE */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--modal-overlay);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: calc(1rem + var(--safe-top)) 1rem calc(1rem + var(--safe-bottom));
}

.modal-card {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  width: 100%;
  max-width: 440px;
  max-height: 88vh;
  border-radius: 14px;
  padding: 1.25rem 1.35rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}

.modal-scrollable-body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-right: 0.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
}

.modal-footer-bar {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-shrink: 0;
}

.modal-title { font-size: 1.15rem; font-weight: 700; }

/* SLEEP TIMER OPTIONS */
.sleep-timer-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-content: flex-start;
  padding: 0.25rem 0 0.75rem;
  flex-shrink: 0;
}

.sleep-option {
  background: var(--bg-main);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition), color var(--transition);
}

.sleep-option:hover { border-color: var(--accent); }

.sleep-option.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* PRO PLAN OPTIONS (PAYWALL) */
.pro-plan-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-shrink: 0;
}

.pro-plan-option {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--transition), background-color var(--transition);
}

.pro-plan-option:hover { border-color: var(--accent); }

.pro-plan-option.featured {
  border-color: var(--accent);
}

.pro-plan-label {
  min-width: 0;
}

.pro-plan-label em {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.pro-plan-price {
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

/* USD ESTIMATES (PAYWALL) */
.pro-price-headline {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-bottom: 0.7rem;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  background: var(--bg-main);
  border: 1px solid var(--border);
}

.pro-price-main {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.pro-price-detail {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.pro-plan-price-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  flex-shrink: 0;
}

.pro-plan-price-usd {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-muted);
  white-space: nowrap;
}

.modal-scrollable-list {
  flex: 1;
  overflow-y: auto;
  max-height: 50vh;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.shelf-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-main);
  cursor: pointer;
  gap: 0.5rem;
  transition: border-color var(--transition);
}
.shelf-card:hover { border-color: var(--accent); }

.shelf-card-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1;
  min-width: 0;
}
.shelf-card-title {
  font-weight: 600;
  font-size: 0.88rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.shelf-card-sub { font-size: 0.74rem; color: var(--text-muted); }

.shelf-action-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.shelf-delete-btn {
  background: transparent;
  border: none;
  color: #ef4444;
  font-size: 1.05rem;
  padding: 0.25rem 0.45rem;
  cursor: pointer;
  border-radius: 4px;
  transition: background var(--transition);
}
.shelf-delete-btn:hover { background: rgba(239, 68, 68, 0.12); }

.bookmark-ribbon-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1rem;
  padding: 0.2rem;
}

.nav-tab-group {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.5rem;
}
.nav-tab-btn {
  flex: 1;
  padding: 0.6rem;
  font-size: 0.88rem;
  font-weight: 600;
  background: transparent;
  border: none;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
}
.nav-tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.chapter-item {
  padding: 0.75rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-main);
  font-size: 0.88rem;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.chapter-item:hover, .chapter-item.active {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

/* AUTH FORM GROUPS */
.auth-form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
  width: 100%;
}

.auth-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.auth-input-field {
  width: 100%;
  padding: 0.72rem 0.85rem;
  border-radius: 8px;
  font-size: 15px;
  border: 1px solid var(--border);
  background: var(--bg-main) !important;
  color: var(--text-main) !important;
  box-sizing: border-box;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.auth-input-field:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.25);
}
.auth-input-field:-webkit-autofill,
.auth-input-field:-webkit-autofill:hover, 
.auth-input-field:-webkit-autofill:focus,
.auth-input-field:-webkit-autofill:active {
  -webkit-text-fill-color: var(--text-main) !important;
  -webkit-box-shadow: 0 0 0px 1000px var(--bg-main) inset !important;
  box-shadow: 0 0 0px 1000px var(--bg-main) inset !important;
  transition: background-color 5000s ease-in-out 0s;
}

/* PROFILE STYLES */
.profile-hero {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.5rem 0 0.85rem;
  border-bottom: 1px solid var(--border);
}

.profile-avatar-circle {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.profile-hero-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.profile-email-title {
  font-size: 0.95rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.profile-tier-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.18rem 0.55rem;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  display: inline-flex;
  width: fit-content;
  border: 1px solid var(--border);
}

.profile-quota-box {
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.quota-meter-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.quota-meter-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.quota-progress-track {
  width: 100%;
  height: 7px;
  border-radius: 10px;
  background: var(--border);
  overflow: hidden;
}

.quota-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 10px;
  transition: width 0.3s ease;
}