*, *::before, *::after { box-sizing: border-box; }

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg0);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, "Noto Sans", "Noto Sans CJK SC", "Noto Sans Arabic", "Noto Sans Khmer", sans-serif;
  font-size: 15px;
  line-height: 1.65;
}

body {
  display: flex;
  flex-direction: column;
}

button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }

.public-home {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 32px clamp(24px, 5vw, 80px) 64px;
  background:
    radial-gradient(circle at 15% 15%, color-mix(in srgb, var(--accent) 18%, transparent) 0%, transparent 45%),
    radial-gradient(circle at 85% 20%, color-mix(in srgb, var(--ok) 10%, transparent) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--accent) 4%, transparent) 0%, transparent 50%),
    var(--bg0);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.public-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.public-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
}

.public-logo {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-size: 1.35rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 20%, var(--bg1)) 0%, color-mix(in srgb, var(--accent) 5%, var(--bg0)) 100%);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.public-brand:hover .public-logo {
  transform: scale(1.05) rotate(-3deg);
  border-color: var(--accent);
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 25%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.public-nav-actions,
.public-cta,
.public-downloads {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.public-language {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text3);
  font-size: 0.85rem;
  font-weight: 500;
}

.public-language select {
  min-height: 36px;
  padding: 0 28px 0 12px;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='rgba(255,255,255,0.5)' stroke-width='2'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M19.5 8.25l-7.5 7.5-7.5-7.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 14px;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.public-language select:hover {
  background-color: var(--bg1);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
}

.public-language select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 20%, transparent);
}

.public-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: clamp(32px, 6vw, 84px);
  align-items: center;
  max-width: 1200px;
  min-height: calc(100vh - 200px);
  margin: 0 auto;
  padding: clamp(48px, 6vw, 96px) 0;
}

.public-kicker {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-shadow: 0 2px 10px color-mix(in srgb, var(--accent) 15%, transparent);
}

.public-hero h1 {
  max-width: 860px;
  margin: 0;
  color: var(--text);
  font-size: clamp(2.4rem, 5.2vw, 4.4rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--text) 50%, color-mix(in srgb, var(--text) 60%, var(--accent)) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.public-lead {
  max-width: 680px;
  margin: 24px 0 0;
  color: var(--text2);
  font-size: clamp(1rem, 1.35vw, 1.18rem);
  line-height: 1.6;
}

.public-cta {
  margin-top: 36px;
}

.public-cta .tb-btn {
  min-height: 44px;
  padding: 0 24px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.public-cta .tb-btn.primary {
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 70%, #ffffff) 100%);
  border: none;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--accent) 25%, transparent);
  color: #ffffff;
}

.public-cta .tb-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px color-mix(in srgb, var(--accent) 45%, transparent);
  filter: brightness(1.08);
}

.public-cta .tb-btn:not(.primary) {
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
}

.public-cta .tb-btn:not(.primary):hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.16);
}

.public-note {
  margin: 16px 0 0;
  color: var(--text3);
  font-size: 0.84rem;
  letter-spacing: 0.01em;
}

.public-error {
  max-width: 720px;
  margin: 18px 0 0;
  padding: 12px 16px;
  border: 1px solid color-mix(in srgb, var(--err) 35%, var(--border));
  border-radius: 10px;
  background: color-mix(in srgb, var(--err) 8%, var(--bg1));
  color: var(--err);
  font-size: 0.88rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.public-hero-card {
  display: grid;
  gap: 16px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.015) 0%, rgba(255, 255, 255, 0.002) 100%);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow:
    0 30px 60px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  position: relative;
}

.public-card-line {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  border: 1px solid rgba(255, 255, 255, 0.03);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.01);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.public-card-line:hover {
  background: rgba(255, 255, 255, 0.035);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  transform: translateX(4px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.public-card-line strong {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.public-card-line:nth-child(1) strong::before { content: "⚡"; font-size: 0.88rem; }
.public-card-line:nth-child(2) strong::before { content: "🎙️"; font-size: 0.88rem; }
.public-card-line:nth-child(3) strong::before { content: "🛡️"; font-size: 0.88rem; }

.public-card-line span {
  color: var(--text2);
  font-size: 0.86rem;
  line-height: 1.4;
}

.public-sections {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 48px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.public-sections article {
  min-height: 220px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.008);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.public-sections article:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.024);
  border-color: color-mix(in srgb, var(--accent) 25%, transparent);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.25),
    0 0 30px color-mix(in srgb, var(--accent) 5%, transparent);
}

.public-sections h2 {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.public-sections p {
  margin: 0;
  color: var(--text2);
  font-size: 0.88rem;
  line-height: 1.5;
  flex: 1;
}

.public-downloads {
  display: flex;
  gap: 8px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.public-downloads .tb-btn {
  min-height: 30px;
  padding: 0 14px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(255, 255, 255, 0.015);
  color: var(--text3);
  cursor: not-allowed;
  transition: all 0.2s ease;
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

#app-shell {
  display: flex;
  flex: 1;
  min-height: 0;
  min-width: 0;
  position: relative;
}

#app-header {
  flex-shrink: 0;
  height: 46px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg0) 88%, var(--bg1));
}

.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 18px;
  background: color-mix(in srgb, var(--bg0) 86%, rgba(0, 0, 0, 0.42));
}

.auth-card {
  width: min(380px, 100%);
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--sidebar-bg);
  box-shadow: 0 18px 54px rgba(0, 0, 0, 0.38);
}

.auth-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.auth-head h2 {
  margin: 0;
  color: var(--accent);
  font-size: 1.2rem;
}

.auth-head p {
  margin: 3px 0 0;
  color: var(--text3);
  font-size: 0.84rem;
}

.auth-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--active);
  font-size: 1.25rem;
}

.auth-error {
  min-height: 18px;
  color: var(--err);
  font-size: 0.82rem;
}

.auth-oauth {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

#app-header .brand-line {
  flex: 1;
  min-width: 0;
}

/* --- Left panel --- */
#left-panel {
  width: 280px;
  min-width: 240px;
  max-width: 40vw;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  min-height: 0;
  position: relative;
  z-index: 12;
}

#left-panel.dock-left,
#right-panel.dock-left {
  border-right: 1px solid var(--border);
  border-left: 0;
}

#left-panel.dock-right,
#right-panel.dock-right {
  border-left: 1px solid var(--border);
  border-right: 0;
}

.sidebar-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

.brand-line {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-line h1 {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  min-width: 0;
  color: var(--accent);
  font-size: 1.0rem;
  line-height: 1.2;
}

.brand-icon { font-size: 1.2rem; }

.icon-btn,
.tb-btn,
.panel-tabs button {
  border: 1px solid var(--input-border);
  background: var(--btn-bg);
  color: var(--text2);
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease;
}

.icon-btn { width: 32px; height: 32px; padding: 0; }
.icon-btn:hover, .tb-btn:hover, .panel-tabs button:hover {
  background: var(--btn-hover); color: var(--text);
}

.tb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 10px;
  min-height: 32px;
  font-size: 0.82rem;
  white-space: nowrap;
}
.tb-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }

.panel-tabs {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  min-width: 0;
}

.panel-tabs button {
  padding: 6px 10px;
  font-size: 0.82rem;
}

.panel-tabs button.active {
  background: var(--active);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--input-border));
  color: var(--accent);
}

.panel-section {
  display: none;
  flex: 1;
  min-height: 0;
}

.panel-section.active {
  display: flex;
  flex-direction: column;
}

/* --- Center workspace --- */
#workspace {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--bg0) 90%, var(--bg1)) 0%, var(--bg0) 180px);
}

#topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  min-height: 46px;
  padding: 8px 18px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg0) 86%, var(--bg1));
}

#breadcrumbs {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow: hidden;
  color: var(--text3);
  font-size: 0.82rem;
}

#breadcrumbs span { white-space: nowrap; }
#breadcrumbs .sep { margin: 0 2px; color: var(--text3); }
#breadcrumbs .crumb { color: var(--text2); }
#breadcrumbs .crumb.current { color: var(--text); font-weight: 600; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.audiobook-settings {
  position: relative;
  display: inline-flex;
}

.audiobook-settings-panel {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 20;
  width: min(320px, 80vw);
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
}

.audiobook-settings-panel.hidden {
  display: none;
}

.audiobook-settings-panel label {
  display: grid;
  gap: 5px;
  color: var(--text2);
  font-size: 0.78rem;
}

.audiobook-settings-panel select {
  width: 100%;
  min-width: 0;
  padding: 7px 9px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 6px;
  color: var(--text);
  outline: none;
}

.audiobook-cost-note {
  padding-top: 2px;
  color: var(--text3);
  font-size: 0.74rem;
  line-height: 1.35;
}

.audiobook-estimate {
  display: grid;
  gap: 4px;
  padding: 8px 9px;
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--border));
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 8%, var(--card-bg));
  color: var(--text2);
  font-size: 0.74rem;
  line-height: 1.35;
}

.audiobook-estimate:empty {
  display: none;
}

#content-wrap {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 32px 60px;
}

#content-wrap.wide { max-width: none; padding: 16px; }

#content-wrap.media-mode {
  max-width: none;
  padding: 0;
  overflow: hidden;
}

.welcome {
  padding: 60px 20px;
  text-align: center;
  color: var(--text3);
}
.welcome .big-icon { margin-bottom: 16px; font-size: 3rem; opacity: 0.4; }
.welcome h2 { margin: 0 0 8px; color: var(--text2); font-size: 1.4rem; }
.welcome p { max-width: 460px; margin: 0 auto; }

/* --- Right panel (chat) --- */
#right-panel {
  width: 340px;
  min-width: 280px;
  max-width: 44vw;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  min-height: 0;
  position: relative;
  z-index: 12;
}

.panel-drag-handle {
  cursor: grab;
  user-select: none;
}

.panel-drag-handle:active,
.panel-grip:active {
  cursor: grabbing;
}

.panel-grip {
  flex: 0 0 24px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text3);
  cursor: grab;
  line-height: 1;
  letter-spacing: -2px;
}

.panel-grip:hover {
  background: var(--hover);
  color: var(--text2);
}

.dragging-panel {
  opacity: 0.72;
}

#app-shell.panel-docking-active::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 500;
  width: 25%;
  pointer-events: none;
  opacity: 1;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px dashed color-mix(in srgb, var(--accent) 45%, transparent);
  transition: left 0.12s ease;
}

#app-shell.panel-docking-active.dock-target-left-outer::before { left: 0; }
#app-shell.panel-docking-active.dock-target-left-inner::before { left: 25%; }
#app-shell.panel-docking-active.dock-target-right-inner::before { left: 50%; }
#app-shell.panel-docking-active.dock-target-right-outer::before { left: 75%; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1000px) {
  #right-panel { display: none; }
  #right-panel.mobile-open {
    display: flex;
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: 100%;
    max-width: 100vw;
    z-index: 200;
  }
}

@media (max-width: 700px) {
  body { overflow: auto; }
  .public-home { min-height: 100vh; overflow: visible; }
  .public-nav { align-items: flex-start; flex-direction: column; }
  .public-nav-actions { justify-content: flex-end; }
  .public-hero { min-height: 0; padding: 42px 0; }
  #app-shell { display: block; overflow: visible; }
  #left-panel { width: 100%; max-width: none; height: 40vh; border-right: 0; border-bottom: 1px solid var(--border); }
  #workspace { height: 60vh; }
  #content-wrap { padding: 16px 12px 40px; }
}

@media (max-width: 980px) {
  .public-hero,
  .public-sections {
    grid-template-columns: 1fr;
  }
}