/* ============================================================
   CG Viewer Engine - Main Styles
   Interactive CG viewer engine (visual novel style)
   ============================================================ */

/* ----- Custom Properties (Theming) ----- */
:root {
  --color-bg: #0a0a0a;
  --color-surface: rgba(20, 20, 20, 0.92);
  --color-overlay: rgba(0, 0, 0, 0.8);
  --color-text: #ffffff;
  --color-text-muted: rgba(255, 255, 255, 0.6);
  --color-accent: #e8b84b;
  --color-accent-hover: #f0c96a;
  --color-border: rgba(255, 255, 255, 0.3);
  --color-border-hover: rgba(255, 255, 255, 0.7);
  --color-textbox-bg: transparent;
  --color-button-hover-bg: rgba(255, 255, 255, 0.1);
  --color-danger: #cc4444;
  --color-lock-bg: rgba(0, 0, 0, 0.7);

  --font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  --font-size-base: 1rem;
  --font-size-dialogue: 1.1rem;
  --font-size-speaker: 0.9rem;
  --font-size-small: 0.85rem;
  --font-size-heading: 1.4rem;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --textbox-min-height: 120px;
  --header-button-size: 36px;

  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
}


/* ----- Reset & Global ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: fixed;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  overscroll-behavior: none;
}

/* Prevent image saving globally */
img {
  pointer-events: none;
  -webkit-touch-callout: none;
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
}

/* Disable context menu hint via CSS */
*:not(input):not(textarea) {
  -webkit-touch-callout: none;
}


/* ============================================================
   Screen Base
   ============================================================ */
.screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.screen[hidden] {
  display: none;
}


/* ============================================================
   Auth Screen
   ============================================================ */
.auth-screen {
  background-color: var(--color-bg);
}

.auth-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-xxl);
  max-width: 400px;
  width: 90%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.auth-card h1 {
  font-size: var(--font-size-heading);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.auth-input {
  width: 100%;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  outline: none;
  transition: border-color 0.2s ease;
}

.auth-input:focus {
  border-color: var(--color-accent);
}

.auth-input::placeholder {
  color: var(--color-text-muted);
}

.auth-button {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-bg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.auth-button:hover {
  background: var(--color-accent-hover);
}

.auth-error {
  color: var(--color-danger);
  font-size: var(--font-size-small);
  min-height: 1.2em;
}


/* ============================================================
   Title Screen
   ============================================================ */
.title-screen {
  flex-direction: column;
}

.title-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.title-bg::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.2) 0%,
    rgba(0, 0, 0, 0.1) 40%,
    rgba(0, 0, 0, 0.5) 70%,
    rgba(0, 0, 0, 0.85) 100%
  );
}

.title-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: auto;
  padding-bottom: calc(var(--spacing-xxl) * 2 + var(--safe-area-bottom));
}

.title-logo {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  margin-bottom: var(--spacing-lg);
  color: #fff;
  text-shadow:
    0 0 10px rgba(251, 181, 196, 0.6),
    0 0 30px rgba(251, 181, 196, 0.3),
    0 2px 8px rgba(0, 0, 0, 0.7);
  position: relative;
}

.title-logo::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
}

.title-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.title-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.title-link {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-small);
  text-decoration: none;
  padding: 0.4em 1em;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
  transition: color 0.2s, border-color 0.2s;
}

.title-link:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.auth-description {
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  text-align: center;
}

.game-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.cg-hidden {
  opacity: 0;
  pointer-events: none;
}

.save-footer {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  flex-shrink: 0;
}

.menu-button.small {
  padding: 8px 20px;
  min-width: auto;
  font-size: var(--font-size-small);
}

.header-btn.active {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-accent);
}

.gallery-empty {
  color: var(--color-text-muted);
  text-align: center;
  padding: var(--spacing-xl);
  grid-column: 1 / -1;
}


/* ============================================================
   Menu Button (shared)
   ============================================================ */
.menu-button {
  display: inline-block;
  padding: 12px 32px;
  min-width: 200px;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  letter-spacing: 0.08em;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.25s ease, border-color 0.25s ease,
    transform 0.15s ease, box-shadow 0.25s ease;
}

.menu-button:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.05);
  transform: scale(1.03);
}

.menu-button:active {
  background: rgba(255, 255, 255, 0.18);
  transform: scale(0.97);
}


/* ============================================================
   Game Screen
   ============================================================ */
.game-screen {
  flex-direction: column;
  background: var(--color-bg);
}


/* ----- CG Viewport ----- */
.cg-viewport {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.cg-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  -webkit-touch-callout: none;
  -webkit-user-drag: none;
}

/* ----- Text Box ----- */
.text-box {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  min-height: var(--textbox-min-height);
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(0, 0, 0, 0.4) 15%,
    rgba(0, 0, 0, 0.75) 40%,
    rgba(0, 0, 0, 0.88) 100%
  );
  padding: var(--spacing-xxl) var(--spacing-lg) var(--spacing-md);
  padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  z-index: 10;
}

.text-box[hidden] {
  display: none;
}

.speaker-name {
  color: var(--color-accent);
  font-size: var(--font-size-speaker);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
  padding-left: var(--spacing-xs);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}

.dialogue-text {
  color: var(--color-text);
  font-size: var(--font-size-dialogue);
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  padding-left: var(--spacing-xs);
  padding-right: var(--spacing-xl);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* Blinking triangle indicator */
.text-indicator {
  position: absolute;
  bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
  right: var(--spacing-lg);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 8px solid rgba(255, 255, 255, 0.7);
  animation: blink 1.2s ease-in-out infinite;
}

/* ----- Choices Overlay ----- */
.choices-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 20;
}

.choices-overlay[hidden] {
  display: none;
}

.choices-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  width: 90%;
  max-width: 480px;
  padding: var(--spacing-lg);
}

.choices-container button {
  min-height: 48px;
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background-color 0.25s ease, border-color 0.25s ease,
    transform 0.15s ease, box-shadow 0.25s ease;
}

.choices-container button:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.06);
  transform: scale(1.02);
}

.choices-container button:active {
  background: rgba(255, 255, 255, 0.18);
  transform: scale(0.98);
}

/* ----- Game Header (top-right icons) ----- */
.game-header {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 15;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  padding-top: calc(var(--spacing-sm) + var(--safe-area-top));
  padding-right: calc(var(--spacing-sm) + var(--safe-area-right));
  opacity: 0.4;
  transition: opacity 0.3s ease;
}

.game-header:hover {
  opacity: 1;
}

.game-header button {
  width: var(--header-button-size);
  height: var(--header-button-size);
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.8);
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.game-header button:hover {
  background: rgba(0, 0, 0, 0.55);
  color: var(--color-text);
  border-color: rgba(255, 255, 255, 0.3);
}


/* ============================================================
   End Card Screen
   ============================================================ */
.end-card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  filter: blur(8px) brightness(0.3);
  transform: scale(1.1);
}

.end-card-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-xxl);
  max-width: 480px;
  width: 90%;
}

.end-card-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.end-card-title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.end-card-stats {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
}

.end-card-stat-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--spacing-xs);
}

.end-card-stat-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.end-card-stat-value {
  font-size: var(--font-size-base);
  color: var(--color-text);
  font-weight: 600;
}

.end-card-bar {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
}

.end-card-bar-fill {
  height: 100%;
  width: 0;
  background: var(--color-accent);
  border-radius: 2px;
  transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.end-card-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  width: 100%;
}

.end-card-actions .menu-button {
  width: 100%;
}

.end-card-links {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-sm);
}

.end-card-links a {
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color 0.2s ease;
}

.end-card-links a:hover {
  color: var(--color-text);
}


/* ============================================================
   Overlay Screen (shared base for save/load, gallery, backlog)
   ============================================================ */
.overlay-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-overlay);
  display: flex;
  flex-direction: column;
  z-index: 50;
  padding: var(--spacing-lg);
  padding-top: calc(var(--spacing-lg) + var(--safe-area-top));
  padding-bottom: calc(var(--spacing-lg) + var(--safe-area-bottom));
  padding-left: calc(var(--spacing-lg) + var(--safe-area-left));
  padding-right: calc(var(--spacing-lg) + var(--safe-area-right));
}

.overlay-screen[hidden] {
  display: none;
}

.overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-shrink: 0;
}

.overlay-header h2 {
  font-size: var(--font-size-heading);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ----- Close Button ----- */
.close-btn {
  position: absolute;
  top: calc(var(--spacing-md) + var(--safe-area-top));
  right: calc(var(--spacing-md) + var(--safe-area-right));
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 1.2rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
  z-index: 51;
}

.close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}


/* ============================================================
   Save / Load Screen
   ============================================================ */
.save-load-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: var(--spacing-md);
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.save-slot {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.save-slot:hover {
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.05);
}

.save-slot-thumbnail {
  width: 100%;
  aspect-ratio: 16 / 9;
  /* Fallback for browsers without aspect-ratio support */
  min-height: 80px;
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.save-slot-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.save-slot-info {
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.save-slot-datetime {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.save-slot-scene {
  font-size: var(--font-size-small);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Empty save slot */
.save-slot.empty {
  opacity: 0.4;
}

.save-slot.empty .save-slot-thumbnail {
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}


/* ============================================================
   Gallery Screen
   ============================================================ */
.gallery-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  flex-shrink: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.gallery-tab {
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-family: var(--font-family);
  font-size: var(--font-size-small);
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.gallery-tab:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.gallery-tab.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
  border-color: var(--color-accent);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  align-content: start;
}

.gallery-item {
  position: relative;
  aspect-ratio: 1 / 1;
  /* Fallback: padding-trick for browsers without aspect-ratio */
  min-height: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.gallery-item:hover {
  border-color: var(--color-border-hover);
  transform: scale(1.02);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

/* Locked gallery item */
.gallery-item.locked {
  cursor: default;
  filter: grayscale(1);
}

.gallery-item.locked:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: none;
}

.gallery-item.locked::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-lock-bg);
  display: flex;
  justify-content: center;
  align-items: center;
}

.gallery-item.locked .lock-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  color: var(--color-text-muted);
  z-index: 1;
}


/* ============================================================
   Gallery Viewer (fullscreen image)
   ============================================================ */
.gallery-viewer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 60;
}

.gallery-viewer[hidden] {
  display: none;
}

.gallery-viewer img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.gallery-viewer .close-btn {
  z-index: 61;
}


/* ============================================================
   Backlog Screen
   ============================================================ */
.backlog-list {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.backlog-entry {
  padding: var(--spacing-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.backlog-speaker {
  color: var(--color-accent);
  font-size: var(--font-size-speaker);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.backlog-text {
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: 1.8;
  white-space: pre-wrap;
}


/* ============================================================
   Settings Screen
   ============================================================ */
.settings-content {
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.settings-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.settings-label {
  flex: 0 0 80px;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.settings-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.settings-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
}

.settings-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

.settings-value {
  flex: 0 0 32px;
  text-align: right;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}


/* ============================================================
   Confirm Dialog
   ============================================================ */
.confirm-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
}

.confirm-overlay[hidden] {
  display: none;
}

.confirm-card {
  background: rgba(20, 20, 20, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-xxl);
  max-width: 360px;
  width: 85%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.confirm-message {
  font-size: var(--font-size-base);
  text-align: center;
  line-height: 1.6;
  color: var(--color-text);
}

.confirm-actions {
  display: flex;
  gap: var(--spacing-md);
  width: 100%;
}

.confirm-btn {
  flex: 1;
  padding: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.confirm-btn-yes {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
}

.confirm-btn-yes:hover {
  background: var(--color-accent-hover);
}

.confirm-btn-no {
  background: transparent;
  color: var(--color-text);
}

.confirm-btn-no:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}


/* ============================================================
   Mobile / Responsive
   ============================================================ */

/* Portrait orientation — fullscreen CG with transparent text overlay */
@media (orientation: portrait) {
  /* CG fills entire viewport */
  .cg-image {
    object-fit: cover;
  }

  /* Text overlay: taller gradient for portrait, more room for CG */
  .text-box {
    min-height: 140px;
    padding-top: var(--spacing-xxl);
  }

  .dialogue-text {
    font-size: 1.05rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
  }

  .speaker-name {
    font-size: 0.9rem;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
  }

  /* Wider choice buttons for touch */
  .choices-container {
    width: 95%;
  }

  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .save-load-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .title-content {
    padding-bottom: calc(var(--spacing-xxl) + var(--safe-area-bottom));
  }
}

/* Small screens */
@media (max-width: 480px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --font-size-dialogue: 1rem;
    --font-size-heading: 1.2rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
  }

  .menu-button {
    padding: 10px 24px;
    min-width: 160px;
    font-size: var(--font-size-small);
  }

  .auth-card {
    padding: var(--spacing-lg) var(--spacing-xl);
  }
}

/* Tablet landscape */
@media (min-width: 768px) and (orientation: landscape) {
  .gallery-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .save-load-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
  }
}

/* PC横画面: スマホ幅に中央寄せ（全画面に適用） */
@media (orientation: landscape) and (min-width: 700px) {
  body {
    max-width: 560px;
    left: 0;
    right: 0;
    margin: 0 auto;
  }
}

/* aspect-ratio fallback for older browsers */
@supports not (aspect-ratio: 1 / 1) {
  .gallery-item {
    padding-bottom: 100%; /* 1:1 square */
    height: 0;
  }
  .gallery-item > * {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
  .save-slot-thumbnail {
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    position: relative;
  }
  .save-slot-thumbnail > * {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
}

/* Re-enable pointer events where needed */
.gallery-item img {
  pointer-events: none;
}

.save-slot {
  pointer-events: auto;
}

.cg-viewport {
  pointer-events: auto;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.35);
}