:root {
  --font-sans: "Manrope", "Segoe UI", sans-serif;
  --font-display: "Fraunces", Georgia, serif;
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --space-1: 0.4rem;
  --space-2: 0.65rem;
  --space-3: 0.9rem;
  --space-4: 1.15rem;
  --space-5: 1.45rem;
  --space-6: 1.9rem;
  --space-7: 2.4rem;
  --shadow-card: 0 10px 34px -16px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 36px rgba(255, 255, 255, 0.22);
}

body[data-theme="muted"] {
  --bg-0: #0f161a;
  --bg-1: #172127;
  --bg-2: #263740;
  --text-0: #edf3f7;
  --text-1: #a8b6bf;
  --accent-0: #8ec5a0;
  --accent-1: #75a8cc;
  --card: rgba(24, 35, 40, 0.82);
  --line: rgba(230, 236, 240, 0.12);
}

body[data-theme="pastel"] {
  --bg-0: #ffe9ef;
  --bg-1: #fff8ef;
  --bg-2: #d9f0ff;
  --text-0: #24314f;
  --text-1: #5d6a86;
  --accent-0: #ff8fc0;
  --accent-1: #80b7ff;
  --card: rgba(255, 255, 255, 0.74);
  --line: rgba(68, 88, 128, 0.16);
}

body[data-theme="neon"] {
  --bg-0: #0f0f1a;
  --bg-1: #1f1145;
  --bg-2: #003349;
  --text-0: #f5fbff;
  --text-1: #b8cdf2;
  --accent-0: #ff2cc7;
  --accent-1: #00f0ff;
  --card: rgba(15, 15, 44, 0.72);
  --line: rgba(177, 245, 255, 0.24);
}

body[data-theme="metallic"] {
  --bg-0: #101218;
  --bg-1: #252b33;
  --bg-2: #4b545f;
  --text-0: #eef2f6;
  --text-1: #b9c0c9;
  --accent-0: #e2c275;
  --accent-1: #a9b4c3;
  --card: rgba(36, 41, 50, 0.74);
  --line: rgba(232, 240, 250, 0.2);
}

body[data-theme="dark"] {
  --bg-0: #08090a;
  --bg-1: #15171d;
  --bg-2: #292d36;
  --text-0: #f5f7fb;
  --text-1: #a7afbc;
  --accent-0: #76e4c9;
  --accent-1: #5f95ff;
  --card: rgba(19, 22, 30, 0.88);
  --line: rgba(236, 243, 255, 0.16);
}

body[data-theme="high-contrast"] {
  --bg-0: #000000;
  --bg-1: #101010;
  --bg-2: #1e1e1e;
  --text-0: #ffffff;
  --text-1: #dddddd;
  --accent-0: #ffe600;
  --accent-1: #00ffff;
  --card: rgba(0, 0, 0, 0.86);
  --line: rgba(255, 255, 255, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text-0);
  background: radial-gradient(circle at 20% 0%, var(--bg-2), var(--bg-0) 54%), linear-gradient(130deg, var(--bg-0), var(--bg-1));
  overflow-x: hidden;
  transition: background 240ms ease, color 240ms ease;
}

.bg-layer {
  position: fixed;
  inset: -20vmax;
  pointer-events: none;
  z-index: 0;
}

.bg-layer-a {
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-0) 35%, transparent) 0%, transparent 56%);
  animation: driftA 15s ease-in-out infinite alternate;
}

.bg-layer-b {
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-1) 32%, transparent) 0%, transparent 58%);
  animation: driftB 18s ease-in-out infinite alternate;
}

@keyframes driftA {
  0% {
    transform: translate(-8%, -4%) scale(1);
  }
  100% {
    transform: translate(8%, 3%) scale(1.07);
  }
}

@keyframes driftB {
  0% {
    transform: translate(7%, -2%) scale(1.02);
  }
  100% {
    transform: translate(-7%, 5%) scale(0.96);
  }
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(100%, 56rem);
  margin: 0 auto;
  padding: calc(var(--space-6) + env(safe-area-inset-top)) var(--space-4) calc(8rem + env(safe-area-inset-bottom));
}

.top-bar,
.section-head,
.player-head {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  align-items: flex-start;
}

.top-bar {
  margin-bottom: var(--space-6);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.active-user {
  margin: var(--space-2) 0 0;
  color: var(--text-1);
  font-size: 0.73rem;
  letter-spacing: 0.05em;
}

.brand-wrap h1 {
  margin: var(--space-2) 0 0;
  line-height: 1.06;
  letter-spacing: 0.01em;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.2vw + 1rem, 2.3rem);
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.69rem;
  color: var(--text-1);
}

.icon-btn,
.back-btn,
.control-btn,
.mini-btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  color: inherit;
  background: color-mix(in srgb, var(--card) 90%, transparent);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.icon-btn,
.back-btn {
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
}

.view {
  display: none;
  animation: fadeIn 190ms ease;
}

.view.is-visible {
  display: block;
}

body.auth-view #open-settings,
body.auth-view #logout-btn,
body.auth-view .active-user {
  display: none;
}

.auth-card {
  max-width: 32rem;
  margin: 0 auto;
  padding: var(--space-5);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.auth-card h2 {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.2vw + 1rem, 2rem);
}

.auth-subtitle {
  margin: 0 0 var(--space-4);
  color: var(--text-1);
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.auth-tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  color: var(--text-0);
  min-height: 2.4rem;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}

.auth-tab.is-active {
  border-color: color-mix(in srgb, var(--accent-0) 70%, white);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent-1) 40%, transparent);
}

.auth-form {
  display: grid;
  gap: var(--space-2);
}

.auth-form label {
  font-size: 0.82rem;
  color: var(--text-1);
}

.auth-form input {
  width: 100%;
  min-height: 2.6rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  color: var(--text-0);
  padding: 0.58rem 0.86rem;
  font: inherit;
}

.password-field {
  position: relative;
}

.password-field input {
  padding-right: 2.9rem;
}

.password-toggle {
  position: absolute;
  right: 0.45rem;
  top: 50%;
  transform: translateY(-50%);
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  color: var(--text-1);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.password-toggle svg {
  width: 1.05rem;
  height: 1.05rem;
}

.auth-form .pill-btn {
  margin-top: var(--space-3);
}

.auth-message {
  margin: var(--space-1) 0 0;
  min-height: 1.2rem;
  font-size: 0.84rem;
  color: color-mix(in srgb, var(--accent-0) 70%, var(--text-0));
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-head {
  margin-bottom: var(--space-4);
  align-items: baseline;
}

.section-head h2,
.player-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1.5vw + 1rem, 1.8rem);
}

.section-head p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-1);
}

.book-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.library-tools {
  margin-bottom: var(--space-4);
}

.search-label {
  display: block;
  margin: 0 0 var(--space-2);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-1);
}

.search-input {
  width: 100%;
  min-height: 2.8rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text-0);
  padding: 0.66rem 0.9rem;
  font: inherit;
  box-shadow: var(--shadow-card);
}

.search-input::placeholder {
  color: color-mix(in srgb, var(--text-1) 80%, transparent);
}

.book-card {
  width: 100%;
  display: grid;
  grid-template-columns: 62px 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--card);
  color: inherit;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(10px);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 180ms ease;
}

.book-card:active {
  transform: translateY(1px) scale(0.996);
}

.book-card:hover {
  border-color: color-mix(in srgb, var(--accent-1) 40%, var(--line));
  box-shadow: 0 14px 34px -18px color-mix(in srgb, var(--accent-1) 45%, transparent);
}

.book-card img {
  width: 62px;
  height: 62px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  border: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}

.book-meta {
  min-width: 0;
}

.book-title {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.26;
}

.book-author {
  margin: var(--space-1) 0 0;
  color: var(--text-1);
  font-size: 0.86rem;
}

.book-resume {
  margin: var(--space-1) 0 0;
  color: color-mix(in srgb, var(--accent-0) 70%, var(--text-0));
  font-size: 0.74rem;
  letter-spacing: 0.02em;
}

.book-index {
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--text-1);
  background: color-mix(in srgb, var(--accent-1) 16%, var(--card));
  border-radius: 999px;
  padding: 0.32rem 0.56rem;
}

.player-head {
  margin-bottom: var(--space-5);
  align-items: center;
}

.cover-frame {
  width: min(92vw, 450px);
  aspect-ratio: 1;
  margin: 0 auto var(--space-5);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  background: color-mix(in srgb, var(--card) 90%, transparent);
}

.cover-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: color-mix(in srgb, var(--bg-0) 70%, black);
}

.player-meta {
  text-align: center;
  margin-bottom: var(--space-5);
}

.player-meta h3 {
  margin: 0;
  line-height: 1.2;
  font-size: clamp(1.2rem, 1.1vw + 1rem, 1.65rem);
}

.player-meta p {
  margin: var(--space-2) 0 0;
  color: var(--text-1);
}

.progress-wrap {
  margin-bottom: var(--space-5);
}

input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--line) 70%, transparent);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: linear-gradient(160deg, var(--accent-0), var(--accent-1));
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-0) 28%, transparent);
}

.time-row {
  margin-top: var(--space-2);
  display: flex;
  justify-content: space-between;
  color: var(--text-1);
  font-size: 0.82rem;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.control-btn {
  min-height: 3.25rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  transition: transform 150ms ease, filter 180ms ease;
}

.control-btn:active,
.pill-btn:active,
.mini-btn:active,
.icon-btn:active,
.back-btn:active {
  transform: translateY(1px) scale(0.98);
}

.control-btn.hero {
  min-height: 3.6rem;
  background: linear-gradient(145deg, color-mix(in srgb, var(--accent-0) 80%, white), color-mix(in srgb, var(--accent-1) 90%, black));
  color: #111;
  border-color: transparent;
  box-shadow: 0 10px 24px -16px color-mix(in srgb, var(--accent-1) 70%, transparent), var(--shadow-glow);
}

.control-btn svg,
.mini-btn svg,
.icon-btn svg,
.back-btn svg {
  width: 1.26rem;
  height: 1.26rem;
}

.control-btn.hero svg {
  width: 1.4rem;
  height: 1.4rem;
}

.control-row {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.pill-btn {
  flex: 1;
  min-height: 2.65rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-0);
  background: var(--card);
  font-weight: 600;
  cursor: pointer;
}

.pill-btn.tiny {
  flex: 0 0 auto;
  min-height: 2.4rem;
  padding: 0.45rem 0.88rem;
  font-size: 0.84rem;
}

.speed-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--card);
}

.speed-wrap label {
  font-size: 0.92rem;
  color: var(--text-1);
}

.speed-wrap select {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  color: var(--text-0);
  border-radius: 10px;
  padding: 0.48rem 0.7rem;
  font: inherit;
}

.mini-player {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3) var(--space-4) calc(var(--space-3) + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--bg-0) 80%, black);
  backdrop-filter: blur(16px);
  border-top: 1px solid var(--line);
  transform: translateY(130%);
  transition: transform 190ms ease;
}

.mini-player.is-visible {
  transform: translateY(0);
}

.mini-main {
  all: unset;
  display: grid;
  grid-template-columns: 48px 1fr;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  cursor: pointer;
}

.mini-main img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.mini-meta p {
  margin: 0;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

#mini-title {
  font-weight: 700;
}

#mini-author {
  font-size: 0.78rem;
  color: var(--text-1);
  margin-top: var(--space-1);
}

.mini-actions {
  display: flex;
  gap: var(--space-2);
}

.mini-btn {
  width: 2.55rem;
  height: 2.55rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
}

dialog {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--bg-1) 84%, black);
  color: var(--text-0);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  width: min(92vw, 480px);
  padding: var(--space-5);
}

dialog::backdrop {
  background: rgba(4, 6, 10, 0.56);
  backdrop-filter: blur(4px);
}

.settings-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
}

.settings-head h2 {
  margin: 0;
  font-family: var(--font-display);
}

.settings-subtitle {
  margin: 0 0 var(--space-4);
  color: var(--text-1);
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  background: var(--card);
}

.setting-row label {
  font-size: 0.9rem;
  color: var(--text-1);
}

.setting-row select {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  color: var(--text-0);
  border-radius: 10px;
  padding: 0.46rem 0.7rem;
  font: inherit;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.theme-btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: inherit;
  border-radius: var(--radius-md);
  padding: var(--space-3);
  cursor: pointer;
  text-align: left;
}

.theme-btn.is-selected {
  border-color: color-mix(in srgb, var(--accent-0) 70%, white);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent-0) 60%, transparent), var(--shadow-card);
}

.theme-btn strong {
  display: block;
  margin-bottom: var(--space-2);
}

.theme-chip {
  height: 0.62rem;
  border-radius: 999px;
  background: var(--chip-gradient);
}

@media (min-width: 720px) {
  .app-shell {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .book-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .player-head {
    margin-bottom: var(--space-6);
  }

  .mini-player {
    width: min(100%, 56rem);
    left: 50%;
    right: auto;
    transform: translate(-50%, 130%);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  .mini-player.is-visible {
    transform: translate(-50%, 0);
  }
}

@media (max-width: 719px) {
  .app-shell {
    min-height: 100dvh;
    padding: calc(var(--space-4) + env(safe-area-inset-top)) var(--space-3) calc(var(--space-4) + env(safe-area-inset-bottom));
  }

  body.player-view .top-bar {
    display: none;
  }

  .top-actions {
    gap: var(--space-1);
    margin-right: max(var(--space-1), env(safe-area-inset-right));
    padding-right: 0.2rem;
  }

  .pill-btn.tiny {
    min-height: 2.2rem;
    padding: 0.4rem 0.7rem;
    font-size: 0.78rem;
  }

  #view-player.is-visible {
    min-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    overflow: hidden;
  }

  .player-head,
  .cover-frame,
  .player-meta,
  .progress-wrap,
  .control-grid,
  .control-row {
    margin-bottom: 0;
  }

  .player-head h2 {
    font-size: 1.24rem;
  }

  .cover-frame {
    width: min(62vw, 262px);
    max-height: 32dvh;
  }

  .player-meta h3 {
    font-size: 1.08rem;
  }

  .player-meta p {
    margin-top: 0.35rem;
    font-size: 0.86rem;
  }

  .time-row {
    margin-top: 0.4rem;
    font-size: 0.76rem;
  }

  .control-grid {
    gap: var(--space-2);
  }

  .control-btn {
    min-height: 2.8rem;
  }

  .control-btn.hero {
    min-height: 3.05rem;
  }

  .control-row {
    gap: var(--space-2);
  }

  .pill-btn {
    min-height: 2.3rem;
    font-size: 0.86rem;
  }

  .setting-row {
    padding: var(--space-2) var(--space-3);
  }
}