:root {
  color-scheme: light;
  --bg: #f7f4ee;
  --ink: #171717;
  --muted: #69635a;
  --line: rgba(23, 23, 23, 0.12);
  --paper: #fffdfa;
  --paper-edge: #e5ddd0;
  --accent: #166a5b;
  --accent-strong: #0d4339;
  --stage: #eee5d8;
  --shadow: rgba(32, 24, 16, 0.18);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), transparent 34rem),
    radial-gradient(circle at 50% 0%, rgba(22, 106, 91, 0.12), transparent 28rem),
    var(--bg);
}

body.is-locked {
  overflow: hidden;
}

body.is-locked .app {
  opacity: 0;
  pointer-events: none;
  user-select: none;
}

body.is-unlocked .lock-screen {
  display: none;
}

button,
input {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.lock-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: max(18px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(18px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.78), transparent 30rem),
    radial-gradient(circle at 50% 16%, rgba(22, 106, 91, 0.14), transparent 24rem),
    var(--bg);
}

.password-form {
  width: min(420px, 100%);
  display: grid;
  gap: 18px;
  padding: clamp(22px, 6vw, 34px);
  border: 1px solid rgba(23, 23, 23, 0.12);
  border-radius: 8px;
  background: rgba(255, 253, 250, 0.9);
  box-shadow: 0 24px 44px rgba(32, 24, 16, 0.14);
  backdrop-filter: blur(14px);
}

.password-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.password-input {
  width: 100%;
  min-height: 46px;
  border: 1px solid rgba(23, 23, 23, 0.16);
  border-radius: 8px;
  padding: 0 14px;
  color: var(--ink);
  background: #fff;
  font-size: 1.25rem;
  letter-spacing: 0.18em;
  outline: none;
}

.password-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(22, 106, 91, 0.14);
}

.password-button {
  min-height: 46px;
  border: 1px solid var(--accent-strong);
  border-radius: 8px;
  padding: 0 18px;
  color: #fff;
  background: var(--accent-strong);
  cursor: pointer;
}

.password-message {
  min-height: 1.2em;
  margin: -4px 0 0;
  color: #9d2b22;
  font-size: 0.92rem;
}

.app {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: clamp(16px, 3vw, 28px);
  padding: max(18px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(18px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
}

.topbar {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: end;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.65rem, 4vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: 0;
}

.album-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.album-tab {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 8px 22px rgba(48, 36, 24, 0.06);
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.album-tab:hover {
  transform: translateY(-1px);
}

.album-tab[aria-selected="true"] {
  color: #fff;
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.album-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.72;
}

.stage {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
}

.book-shell {
  min-height: 0;
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  align-items: center;
}

.flip-frame {
  min-width: 0;
  min-height: 340px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0) 42%),
    var(--stage);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.5),
    0 24px 40px var(--shadow);
  overflow: visible;
}

.book {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
}

.album-page {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0) 45%),
    var(--paper);
  border: 2px solid var(--paper-edge);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.72),
    inset 0 -10px 18px rgba(32, 24, 16, 0.05);
}

.album-page.--hard {
  background:
    linear-gradient(90deg, rgba(32, 24, 16, 0.035), transparent 5%, transparent 95%, rgba(32, 24, 16, 0.035)),
    linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0) 45%),
    var(--paper);
}

.album-page.--hard.--left {
  box-shadow:
    inset -10px 0 14px rgba(32, 24, 16, 0.045),
    inset 0 0 0 1px rgba(255, 255, 255, 0.72),
    inset 0 -10px 18px rgba(32, 24, 16, 0.04);
}

.album-page.--hard.--right {
  box-shadow:
    inset 10px 0 14px rgba(32, 24, 16, 0.045),
    inset 0 0 0 1px rgba(255, 255, 255, 0.72),
    inset 0 -10px 18px rgba(32, 24, 16, 0.04);
}

.album-page picture,
.album-page img {
  width: 100%;
  height: 100%;
  display: block;
}

.album-page img {
  object-fit: contain;
  padding: clamp(10px, 1.6vw, 18px);
  background: var(--paper);
  user-select: none;
  -webkit-user-drag: none;
}

.album-page span {
  position: absolute;
  left: clamp(14px, 2vw, 22px);
  bottom: clamp(12px, 1.8vw, 18px);
  min-width: 46px;
  border-radius: 999px;
  padding: 5px 10px;
  color: rgba(255, 255, 255, 0.95);
  background: rgba(0, 0, 0, 0.48);
  font-size: clamp(0.72rem, 1.6vw, 0.86rem);
  line-height: 1;
  text-align: center;
  backdrop-filter: blur(8px);
}

.stf__parent {
  overflow: visible !important;
}

.stf__wrapper {
  filter: drop-shadow(0 20px 32px rgba(32, 24, 16, 0.18));
}

.stf__hardShadow,
.stf__hardInnerShadow {
  opacity: 0.48 !important;
  filter: blur(0.7px);
  mix-blend-mode: multiply;
}

.stf__hardShadow {
  background: linear-gradient(
    to left,
    rgba(32, 24, 16, 0.16) 0%,
    rgba(32, 24, 16, 0.08) 42%,
    rgba(32, 24, 16, 0) 100%
  ) !important;
}

.stf__hardInnerShadow {
  background: linear-gradient(
    to right,
    rgba(32, 24, 16, 0.12) 0%,
    rgba(32, 24, 16, 0.055) 45%,
    rgba(32, 24, 16, 0) 100%
  ) !important;
}

.nav-controls {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
}

.nav-button {
  width: 54px;
  height: 54px;
  border: 1px solid rgba(23, 23, 23, 0.16);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--accent-strong);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 14px 28px rgba(48, 36, 24, 0.12);
  cursor: pointer;
  font-size: 2.1rem;
  line-height: 1;
  transition: transform 160ms ease, opacity 160ms ease, background 160ms ease;
}

.nav-button:hover {
  transform: translateY(-1px);
  background: #fff;
}

.nav-button:disabled {
  opacity: 0.38;
  cursor: default;
  transform: none;
}

.controls {
  display: grid;
  grid-template-columns: auto auto minmax(130px, 1fr);
  gap: 16px;
  align-items: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.counter {
  min-width: 7.5ch;
  font-variant-numeric: tabular-nums;
}

.page-range {
  width: 100%;
  accent-color: var(--accent);
}

@media (max-width: 760px) {
  .app {
    gap: 14px;
    padding: max(14px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right))
      max(14px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  }

  .topbar {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .album-tabs {
    justify-content: stretch;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .album-tab {
    width: 100%;
    justify-content: center;
    min-width: 0;
    padding-inline: 10px;
  }

  .flip-frame {
    min-height: clamp(220px, 62vw, 350px);
  }

  .nav-button {
    width: 42px;
    height: 42px;
    font-size: 1.7rem;
    background: rgba(255, 255, 255, 0.84);
  }

  .nav-button:hover {
    transform: translateY(-1px);
  }

  .controls {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 10px;
  }

  .page-range {
    width: 100%;
  }
}

@media (max-width: 980px) and (max-height: 520px) {
  .app {
    gap: 10px;
    padding-block: max(10px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-bottom));
  }

  .topbar {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .eyebrow {
    margin-bottom: 3px;
  }

  h1 {
    font-size: 1.55rem;
  }

  .stage {
    gap: 10px;
  }

  .flip-frame {
    min-height: min(52vh, 250px);
  }

  .nav-button {
    width: 40px;
    height: 40px;
    font-size: 1.6rem;
  }

  .controls {
    grid-template-columns: auto auto minmax(120px, 1fr);
    gap: 12px;
  }
}

@media (max-width: 430px) {
  h1 {
    font-size: 1.55rem;
  }

  .album-tab {
    font-size: 0.9rem;
  }

  .password-row {
    grid-template-columns: 1fr;
  }

  .nav-button {
    width: 38px;
    height: 38px;
    font-size: 1.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}