/* ============================================================
   數學星球大冒險 — main.css
   宇宙底色、設計變數、畫面骨架、版面與響應式規則
   ============================================================ */

/* ------------------------------------------------------------
   1. 設計變數
   ------------------------------------------------------------ */
:root {
  color-scheme: dark;

  /* 宇宙底色 */
  --space-1000: #05050f;
  --space-950: #090a1d;
  --space-900: #0d0e24;
  --space-800: #12132e;
  --space-700: #191a3d;
  --space-600: #232456;
  --space-500: #30316b;

  /* 紙張／卡片 */
  --paper: #fff8e9;
  --paper-warm: #ffefd2;
  --paper-deep: #ffe4b8;
  --paper-line: #e8d4ae;
  --paper-line-strong: #d5bb8c;
  --paper-ink: #251b3d;
  --paper-muted: #6a5c80;

  /* 文字 */
  --text: #fbf7ed;
  --text-dim: #c9c5df;
  --text-muted: #9e9aba;
  --line: rgba(255, 255, 255, 0.13);
  --line-strong: rgba(255, 255, 255, 0.26);

  /* 糖果色 */
  --gold: #ffd166;
  --gold-deep: #c78a12;
  --mint: #34d399;
  --mint-deep: #0f8a62;
  --coral: #fb7185;
  --coral-deep: #b52a45;
  --sky: #38bdf8;
  --sky-deep: #0b6f9e;
  --violet: #a78bfa;
  --violet-deep: #5b3fb0;
  --orange: #ff9f5a;

  /* 主題色（預設：主畫面暖陽黃） */
  --accent: #ffd166;
  --accent-hi: #ffe79f;
  --accent-2: #fb7185;
  --accent-ink: #2b1a00;
  --accent-soft: rgba(255, 209, 102, 0.15);
  --accent-shadow: #a86e08;
  --glow: rgba(255, 209, 102, 0.44);
  --focus: #bff7ff;

  /* 圓角 */
  --r-xs: 10px;
  --r-sm: 14px;
  --r-md: 20px;
  --r-lg: 26px;
  --r-xl: 34px;
  --r-pill: 999px;

  /* 陰影 */
  --shadow-card: 0 22px 54px rgba(3, 3, 15, 0.42), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-paper: 0 26px 60px rgba(5, 4, 20, 0.4), 0 5px 0 var(--paper-line-strong), inset 0 1px 0 #fffdf8;
  --shadow-toy: 0 5px 0 rgba(0, 0, 0, 0.38), 0 12px 22px rgba(0, 0, 0, 0.26);
  --shadow-glow: 0 0 0 1px rgba(255, 255, 255, 0.12), 0 0 34px var(--glow);

  /* 字體：全部使用系統字型，不載入外部資源 */
  --font-ui: "PingFang TC", "PingFang HK", "Hiragino Sans CNS", "Microsoft JhengHei",
    "Noto Sans TC", "Heiti TC", ui-rounded, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "PingFang TC", "Hiragino Sans CNS", "Microsoft JhengHei", "Noto Sans TC",
    ui-rounded, system-ui, -apple-system, sans-serif;
  --font-num: ui-rounded, "SF Pro Rounded", "Avenir Next", "PingFang TC", "Menlo",
    ui-monospace, monospace;

  /* 間距與安全區 */
  --gutter: clamp(14px, 3vw, 40px);
  --safe-top: max(12px, env(safe-area-inset-top));
  --safe-bottom: max(12px, env(safe-area-inset-bottom));
  --safe-left: max(var(--gutter), env(safe-area-inset-left));
  --safe-right: max(var(--gutter), env(safe-area-inset-right));
  --topbar-h: clamp(58px, 8vh, 74px);

  /* 圖層 */
  --z-cosmos: 0;
  --z-game: 1;
  --z-sticky: 20;
  --z-feedback: 45;
  --z-sheet: 60;
  --z-scratchpad: 70;
  --z-confetti: 85;
  --z-toast: 95;
}

/* 星系主題色 */
#game[data-galaxy="1"] {
  --accent: #34d399;
  --accent-hi: #86f3c9;
  --accent-2: #38bdf8;
  --accent-ink: #032b1f;
  --accent-soft: rgba(52, 211, 153, 0.15);
  --accent-shadow: #0b7a55;
  --glow: rgba(52, 211, 153, 0.42);
}

#game[data-galaxy="2"] {
  --accent: #fbbf24;
  --accent-hi: #ffe18b;
  --accent-2: #fb7185;
  --accent-ink: #2e1a00;
  --accent-soft: rgba(251, 191, 36, 0.16);
  --accent-shadow: #a35c00;
  --glow: rgba(251, 191, 36, 0.44);
}

#game[data-galaxy="3"] {
  --accent: #a78bfa;
  --accent-hi: #d1c2ff;
  --accent-2: #34d399;
  --accent-ink: #1d0f49;
  --accent-soft: rgba(167, 139, 250, 0.16);
  --accent-shadow: #5b3fb0;
  --glow: rgba(167, 139, 250, 0.45);
}

#game[data-galaxy="4"] {
  --accent: #38bdf8;
  --accent-hi: #a5e9ff;
  --accent-2: #fbbf24;
  --accent-ink: #04263a;
  --accent-soft: rgba(56, 189, 248, 0.16);
  --accent-shadow: #0b6f9e;
  --glow: rgba(56, 189, 248, 0.44);
}

/* ------------------------------------------------------------
   2. Reset 與基礎樣式
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  background: var(--space-950);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.015em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

button,
input,
select,
textarea {
  margin: 0;
  font: inherit;
  color: inherit;
}

button {
  border: 0;
  background: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

button:disabled {
  cursor: not-allowed;
}

img,
svg,
canvas {
  display: block;
  max-width: 100%;
}

svg {
  overflow: visible;
}

table {
  border-collapse: collapse;
}

a {
  color: var(--sky);
  text-underline-offset: 0.18em;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
}

[hidden] {
  display: none !important;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

:where(button, a, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

:where(button, a, input, select, textarea, summary, [tabindex]):focus:not(:focus-visible) {
  outline: none;
}

/* 共用無障礙工具類 */
.sr-only,
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.sr-only--focusable:focus-visible {
  position: fixed !important;
  top: 12px;
  left: 12px;
  z-index: 999;
  width: auto !important;
  height: auto !important;
  padding: 10px 16px !important;
  clip: auto !important;
  clip-path: none !important;
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: var(--r-sm);
}

/* ------------------------------------------------------------
   3. 宇宙背景：星野、星雲、暗角
   ------------------------------------------------------------ */
.cosmos {
  position: fixed;
  inset: 0;
  z-index: var(--z-cosmos);
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 50% -12%, rgba(86, 81, 170, 0.32), transparent 70%),
    radial-gradient(ellipse 55% 45% at 8% 95%, rgba(15, 118, 110, 0.18), transparent 70%),
    linear-gradient(180deg, #080919 0%, var(--space-800) 48%, #0a0b20 100%);
}

.cosmos::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    radial-gradient(ellipse 85% 70% at 50% 45%, transparent 42%, rgba(3, 3, 12, 0.5) 100%),
    linear-gradient(180deg, rgba(3, 3, 12, 0.34), transparent 18%, transparent 82%, rgba(3, 3, 12, 0.42));
}

.cosmos::after {
  content: "";
  position: absolute;
  top: 12%;
  left: 7%;
  z-index: 3;
  width: 120px;
  height: 2px;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
  box-shadow: 0 0 10px rgba(180, 238, 255, 0.8);
  transform: rotate(-24deg);
  opacity: 0;
  animation: shooting-star 14s ease-in-out 4s infinite;
}

.starfield {
  position: absolute;
  inset: -8%;
  z-index: 1;
  opacity: 0.85;
  background-image:
    radial-gradient(1.5px 1.5px at 4% 12%, #fffdf5 50%, transparent 52%),
    radial-gradient(1px 1px at 11% 66%, #d9f5ff 50%, transparent 52%),
    radial-gradient(1.6px 1.6px at 17% 27%, #ffe8b0 50%, transparent 52%),
    radial-gradient(1px 1px at 23% 82%, #fff 50%, transparent 52%),
    radial-gradient(2px 2px at 29% 48%, #bfefff 50%, transparent 52%),
    radial-gradient(1px 1px at 34% 8%, #fff 50%, transparent 52%),
    radial-gradient(1.4px 1.4px at 39% 73%, #ffe4e8 50%, transparent 52%),
    radial-gradient(1px 1px at 44% 34%, #fff 50%, transparent 52%),
    radial-gradient(1.8px 1.8px at 49% 91%, #fff4cf 50%, transparent 52%),
    radial-gradient(1px 1px at 53% 21%, #e9e3ff 50%, transparent 52%),
    radial-gradient(1.5px 1.5px at 58% 62%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 63% 43%, #ccefff 50%, transparent 52%),
    radial-gradient(1.3px 1.3px at 68% 15%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 72% 78%, #ffe9b5 50%, transparent 52%),
    radial-gradient(2px 2px at 77% 38%, #d8f6ff 50%, transparent 52%),
    radial-gradient(1px 1px at 82% 59%, #fff 50%, transparent 52%),
    radial-gradient(1.4px 1.4px at 87% 24%, #fff2cf 50%, transparent 52%),
    radial-gradient(1px 1px at 92% 87%, #fff 50%, transparent 52%),
    radial-gradient(1.6px 1.6px at 96% 46%, #d7ecff 50%, transparent 52%),
    radial-gradient(1px 1px at 8% 38%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 19% 93%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 47% 55%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 65% 88%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 89% 70%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 3% 78%, #d8ecff 50%, transparent 52%),
    radial-gradient(1px 1px at 31% 18%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 55% 5%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 75% 95%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 98% 9%, #fff 50%, transparent 52%),
    radial-gradient(1px 1px at 41% 97%, #d9f3ff 50%, transparent 52%);
  animation: twinkle 7.5s ease-in-out infinite alternate;
}

.starfield::before,
.starfield::after {
  content: "";
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
}

.starfield::before {
  background-image:
    radial-gradient(2.2px 2.2px at 14% 44%, #fff8d8 50%, transparent 52%),
    radial-gradient(1px 1px at 26% 12%, #fff 50%, transparent 52%),
    radial-gradient(2px 2px at 37% 88%, #c9efff 50%, transparent 52%),
    radial-gradient(1px 1px at 51% 30%, #fff 50%, transparent 52%),
    radial-gradient(2.4px 2.4px at 61% 76%, #ffe0e5 50%, transparent 52%),
    radial-gradient(1px 1px at 71% 26%, #fff 50%, transparent 52%),
    radial-gradient(2px 2px at 84% 49%, #fff4c4 50%, transparent 52%),
    radial-gradient(1px 1px at 94% 63%, #fff 50%, transparent 52%),
    radial-gradient(1.4px 1.4px at 5% 91%, #fff 50%, transparent 52%),
    radial-gradient(1.4px 1.4px at 43% 16%, #dff5ff 50%, transparent 52%),
    radial-gradient(1.4px 1.4px at 69% 57%, #fff 50%, transparent 52%),
    radial-gradient(1.4px 1.4px at 79% 83%, #ffe3b0 50%, transparent 52%);
  animation: twinkle 5.4s ease-in-out 0.8s infinite alternate-reverse;
  opacity: 0.9;
}

.starfield::after {
  background-image:
    radial-gradient(3px 3px at 9% 23%, rgba(255, 242, 196, 0.95) 50%, transparent 52%),
    radial-gradient(2.8px 2.8px at 46% 43%, rgba(208, 244, 255, 0.95) 50%, transparent 52%),
    radial-gradient(3.2px 3.2px at 88% 31%, rgba(255, 220, 228, 0.9) 50%, transparent 52%),
    radial-gradient(2.6px 2.6px at 32% 64%, rgba(255, 255, 255, 0.9) 50%, transparent 52%),
    radial-gradient(2.6px 2.6px at 73% 12%, rgba(220, 238, 255, 0.9) 50%, transparent 52%),
    radial-gradient(2.8px 2.8px at 57% 94%, rgba(255, 240, 197, 0.9) 50%, transparent 52%);
  animation: twinkle 9s ease-in-out 1.4s infinite alternate;
  opacity: 0.8;
}

/* 若 JS 在星野中注入星點，也給它們一致的閃爍感 */
.starfield .star,
.starfield .star-dot,
.starfield__star {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #fff8de;
  box-shadow: 0 0 7px rgba(255, 246, 204, 0.9);
  animation: twinkle 4s ease-in-out infinite alternate;
}

.nebula {
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  filter: blur(64px);
  opacity: 0.42;
  mix-blend-mode: screen;
  will-change: transform;
}

.nebula--1 {
  top: -22vmax;
  left: -16vmax;
  width: 58vmax;
  height: 58vmax;
  background: radial-gradient(circle at 42% 42%, rgba(52, 211, 153, 0.56), rgba(13, 148, 136, 0.18) 46%, transparent 70%);
  animation: drift 26s ease-in-out infinite alternate;
}

.nebula--2 {
  top: -8vmax;
  right: -22vmax;
  width: 62vmax;
  height: 62vmax;
  background: radial-gradient(circle at 55% 45%, rgba(251, 113, 133, 0.46), rgba(147, 51, 234, 0.14) 48%, transparent 70%);
  animation: drift 32s ease-in-out 1s infinite alternate-reverse;
}

.nebula--3 {
  bottom: -30vmax;
  left: 24%;
  width: 70vmax;
  height: 56vmax;
  background: radial-gradient(circle at 50% 50%, rgba(56, 189, 248, 0.35), rgba(167, 139, 250, 0.22) 44%, transparent 72%);
  animation: drift 38s ease-in-out 2s infinite alternate;
}

/* ------------------------------------------------------------
   4. 遊戲容器與畫面切換
   ------------------------------------------------------------ */
.game {
  position: relative;
  z-index: var(--z-game);
  width: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  isolation: isolate;
}

.screen {
  position: absolute;
  inset: 0;
  display: none;
  width: 100%;
  height: 100%;
  padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.screen.is-active {
  display: flex;
  flex-direction: column;
}

/* ------------------------------------------------------------
   5. 主畫面
   ------------------------------------------------------------ */
.screen--home {
  background:
    radial-gradient(ellipse 46% 48% at 23% 44%, var(--accent-soft), transparent 72%),
    radial-gradient(ellipse 44% 54% at 88% 86%, rgba(56, 189, 248, 0.1), transparent 72%);
}

.screen--home.is-active {
  display: grid;
  place-items: center;
  overflow-y: auto;
}

.home {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(8px, 1.25vh, 14px);
  width: min(1180px, 100%);
  margin: auto;
  padding: clamp(10px, 2vh, 26px) 0;
  text-align: center;
}

.home__planet {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  min-height: clamp(150px, 23vh, 240px);
}

.home__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  min-height: 32px;
  padding: 0.3em 0.95em;
  color: var(--accent-hi);
  background: rgba(9, 10, 28, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-pill);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  font-size: clamp(0.72rem, 1.6vw, 0.86rem);
  font-weight: 800;
  letter-spacing: 0.12em;
}

.home__kicker::before {
  content: "✦";
  color: var(--accent-2);
  font-size: 0.9em;
  text-shadow: 0 0 10px var(--accent-2);
}

.home__title {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  font-size: clamp(2.8rem, 6.6vw, 5.9rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: 0.04em;
}

.home__title-top {
  color: var(--text);
  text-shadow:
    0 2px 0 rgba(4, 4, 16, 0.65),
    0 12px 26px rgba(3, 3, 16, 0.5),
    0 0 44px rgba(255, 255, 255, 0.12);
}

.home__title-bottom {
  position: relative;
  display: inline-block;
  margin-top: 0.04em;
  color: var(--accent);
  text-shadow:
    0 3px 0 var(--accent-shadow),
    0 8px 0 rgba(4, 4, 16, 0.42),
    0 16px 32px var(--glow);
}

.home__title-bottom::after {
  content: "✦";
  position: absolute;
  top: -0.18em;
  right: -0.58em;
  color: var(--accent-2);
  font-size: 0.28em;
  text-shadow: 0 0 12px var(--accent-2);
  animation: twinkle 2.8s ease-in-out infinite alternate;
}

.home__tagline {
  max-width: 34em;
  color: var(--text-dim);
  font-size: clamp(0.94rem, 1.6vw, 1.14rem);
  font-weight: 500;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

.home__ship {
  position: relative;
  display: grid;
  place-items: center;
  width: min(320px, 100%);
  min-height: clamp(64px, 10vh, 110px);
}

.home__cta {
  display: flex;
  justify-content: center;
  margin-top: clamp(2px, 0.8vh, 8px);
}

.home__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(8px, 1.2vw, 12px);
}

.home__progress {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: clamp(4px, 1vh, 10px);
  color: var(--text-dim);
  font-size: clamp(0.76rem, 1.4vw, 0.87rem);
  font-weight: 700;
}

/* ------------------------------------------------------------
   6. 星圖畫面
   ------------------------------------------------------------ */
.screen--map {
  background:
    radial-gradient(ellipse 50% 42% at 15% 10%, rgba(52, 211, 153, 0.1), transparent 70%),
    radial-gradient(ellipse 45% 40% at 88% 90%, rgba(56, 189, 248, 0.1), transparent 70%);
}

.screen--map.is-active {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

.galaxy-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: clamp(10px, 1.45vw, 20px);
  width: min(1400px, 100%);
  min-height: 0;
  margin: 0 auto;
  padding: clamp(6px, 1.2vh, 16px) 0;
  overflow: hidden;
}

.map-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  padding: clamp(6px, 1vh, 12px) 0 0;
}

/* 小三閱讀舒適度：關卡卡片文字不隨壓縮版面變得過小 */
.screen--map .level-card__title {
  font-size: clamp(0.8rem, 0.95vw + 0.2rem, 0.95rem);
}

.screen--map .level-card__concept {
  font-size: 0.7rem;
}

/* ------------------------------------------------------------
   7. 關卡介紹
   ------------------------------------------------------------ */
.screen--intro {
  background:
    radial-gradient(ellipse 44% 52% at 26% 45%, var(--accent-soft), transparent 72%),
    radial-gradient(ellipse 40% 44% at 90% 12%, rgba(56, 189, 248, 0.1), transparent 70%);
}

.screen--intro.is-active {
  display: grid;
  place-items: center;
  overflow-y: auto;
}

.intro {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(22px, 4vw, 64px);
  align-items: center;
  width: min(1120px, 100%);
  margin: auto;
  padding: clamp(16px, 4vh, 48px) 0;
}

.intro__planet {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
}

.intro__card {
  position: relative;
  order: 2;
  padding: clamp(20px, 3.4vh, 34px) clamp(20px, 3.2vw, 40px);
  overflow: hidden;
  color: var(--paper-ink);
  background:
    radial-gradient(rgba(37, 27, 61, 0.032) 1px, transparent 1.4px) 0 0 / 15px 15px,
    linear-gradient(165deg, #fffdf6 0%, var(--paper) 46%, var(--paper-warm) 100%);
  border: 2px solid var(--paper-line);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-paper);
}

.intro__card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 8px;
  background:
    linear-gradient(90deg, var(--accent), var(--accent-2) 46%, var(--sky) 78%, var(--accent));
  background-size: 220% 100%;
  animation: gradient-shift 9s ease infinite;
}

.intro__card h1 {
  margin: 0.35em 0 0.18em;
  color: var(--paper-ink);
  font-size: clamp(1.6rem, 3.1vw, 2.55rem);
  letter-spacing: 0.02em;
}

.intro__concept {
  color: var(--paper-muted);
  font-size: clamp(0.92rem, 1.6vw, 1.05rem);
  font-weight: 800;
  line-height: 1.6;
}

.intro__story {
  margin-top: clamp(12px, 2vh, 20px);
  color: #493d61;
  font-size: clamp(0.95rem, 1.65vw, 1.08rem);
  line-height: 1.85;
}

.intro__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(14px, 2.2vh, 22px);
}

.intro__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: clamp(18px, 2.8vh, 28px);
}

.intro__actions .btn--primary {
  margin-left: auto;
}

/* ------------------------------------------------------------
   8. 答題畫面
   ------------------------------------------------------------ */
.screen--play {
  padding: 0;
  background:
    radial-gradient(ellipse 40% 55% at 8% 16%, var(--accent-soft), transparent 70%),
    linear-gradient(180deg, rgba(5, 5, 18, 0.18), rgba(5, 5, 18, 0.55));
}

.screen--play.is-active {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

.play-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(370px, 0.96fr);
  gap: clamp(12px, 1.8vw, 24px);
  width: min(1680px, 100%);
  min-height: 0;
  margin: 0 auto;
  padding:
    clamp(8px, 1.5vh, 18px)
    var(--safe-right)
    max(10px, env(safe-area-inset-bottom))
    var(--safe-left);
}

.play-visual-wrap {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 0;
  padding: clamp(8px, 1vw, 12px);
  overflow: hidden;
  background: linear-gradient(155deg, #22234e 0%, #13142f 55%, #0b0c21 100%);
  border: 2px solid var(--line);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-card);
}

.play-visual-wrap::after {
  content: "";
  position: absolute;
  inset: 8px;
  z-index: 0;
  pointer-events: none;
  border-radius: calc(var(--r-xl) - 8px);
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.18);
}

.play-visual {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: clamp(10px, 1.8vh, 22px);
  overflow: auto;
  color: var(--paper-ink);
  background:
    radial-gradient(rgba(37, 27, 61, 0.04) 1px, transparent 1.4px) 0 0 / 18px 18px,
    radial-gradient(ellipse at 50% 10%, #fffdf6, var(--paper) 52%, var(--paper-warm) 100%);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: calc(var(--r-xl) - 8px);
  box-shadow:
    inset 0 0 0 1px rgba(213, 187, 140, 0.42),
    inset 0 0 46px rgba(196, 148, 64, 0.11);
}

.play-panel {
  display: flex;
  flex-direction: column;
  gap: clamp(8px, 1.35vh, 14px);
  min-width: 0;
  min-height: 0;
  padding: 2px 4px 4px 2px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.play-panel::-webkit-scrollbar {
  width: 8px;
}

.play-panel::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: var(--r-pill);
}

.play-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
  padding-top: 2px;
}

.answer-area {
  display: grid;
  gap: 10px;
  min-width: 0;
}

/* ------------------------------------------------------------
   9. 過關結算
   ------------------------------------------------------------ */
.screen--result {
  background:
    radial-gradient(ellipse 52% 48% at 50% 12%, var(--accent-soft), transparent 72%),
    radial-gradient(ellipse 40% 40% at 82% 90%, rgba(52, 211, 153, 0.1), transparent 70%);
}

.screen--result.is-active {
  display: grid;
  place-items: center;
  overflow-y: auto;
}

.result {
  width: min(760px, 100%);
  margin: auto;
  padding: clamp(14px, 3vh, 32px) 0;
}

.result__card {
  position: relative;
  padding: clamp(24px, 4vh, 42px) clamp(20px, 3.4vw, 44px);
  overflow: hidden;
  color: var(--paper-ink);
  text-align: center;
  background:
    radial-gradient(rgba(37, 27, 61, 0.03) 1px, transparent 1.4px) 0 0 / 15px 15px,
    linear-gradient(165deg, #fffdf6, var(--paper) 52%, var(--paper-warm));
  border: 2px solid var(--paper-line);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-paper);
}

.result__card::before,
.result__card::after {
  content: "✦";
  position: absolute;
  color: var(--accent);
  font-size: clamp(1.1rem, 2.4vw, 1.8rem);
  opacity: 0.6;
  animation: twinkle 3.4s ease-in-out infinite alternate;
}

.result__card::before {
  top: 22px;
  left: 26px;
}

.result__card::after {
  right: 28px;
  bottom: 24px;
  animation-delay: 1.1s;
}

.result__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.32em 1em;
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: var(--r-pill);
  box-shadow: 0 3px 0 var(--accent-shadow);
  font-size: clamp(0.72rem, 1.4vw, 0.84rem);
  font-weight: 900;
  letter-spacing: 0.1em;
}

.result__stars {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(6px, 1.4vw, 14px);
  min-height: 1.25em;
  margin: clamp(4px, 1vh, 10px) 0 0;
}

.result__card h1 {
  margin: 0.14em 0 0.18em;
  color: var(--paper-ink);
  font-size: clamp(2rem, 4.6vw, 3.5rem);
  letter-spacing: 0.03em;
}

.result__subtitle {
  max-width: 34em;
  margin: 0 auto;
  color: var(--paper-muted);
  font-size: clamp(0.94rem, 1.7vw, 1.06rem);
  line-height: 1.7;
}

.result__rewards {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: clamp(14px, 2.4vh, 22px);
}

.result__monster {
  margin-top: clamp(16px, 2.8vh, 26px);
}

.result__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: clamp(18px, 3vh, 30px);
}

/* ------------------------------------------------------------
   10. 飛船工坊與星際圖鑑
   ------------------------------------------------------------ */
.screen--shop,
.screen--collection {
  background:
    radial-gradient(ellipse 50% 34% at 50% 0%, var(--accent-soft), transparent 70%),
    radial-gradient(ellipse 40% 34% at 90% 96%, rgba(56, 189, 248, 0.09), transparent 70%);
}

.screen--shop.is-active,
.screen--collection.is-active {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.shop-preview,
.shop-grid,
.collection-grid {
  width: min(1240px, 100%);
  margin-right: auto;
  margin-left: auto;
}

.shop-preview {
  flex: 0 0 auto;
  margin-top: clamp(10px, 1.8vh, 18px);
}

.shop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(210px, 100%), 1fr));
  gap: clamp(10px, 1.5vw, 18px);
  padding: clamp(14px, 2.4vh, 24px) 0 clamp(20px, 4vh, 40px);
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(190px, 100%), 1fr));
  gap: clamp(10px, 1.5vw, 18px);
  padding: clamp(14px, 2.4vh, 24px) 0 clamp(24px, 5vh, 48px);
}

/* ------------------------------------------------------------
   11. 響應式：平板、手機、橫向手機
   ------------------------------------------------------------ */
@media (min-width: 920px) {
  .home {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    grid-template-areas:
      "planet kicker"
      "planet title"
      "planet tagline"
      "planet cta"
      "ship actions"
      "progress progress";
    grid-template-rows: auto auto auto auto auto auto;
    align-items: center;
    justify-items: start;
    column-gap: clamp(28px, 4.4vw, 70px);
    row-gap: clamp(7px, 1.3vh, 14px);
    text-align: left;
  }

  .home__planet {
    grid-area: planet;
    align-self: center;
    justify-self: center;
    min-height: 0;
  }

  .home__kicker {
    grid-area: kicker;
    align-self: end;
  }

  .home__title {
    grid-area: title;
    align-items: flex-start;
  }

  .home__tagline {
    grid-area: tagline;
    max-width: 37em;
  }

  .home__cta {
    grid-area: cta;
    justify-content: flex-start;
  }

  .home__ship {
    grid-area: ship;
    align-self: center;
    justify-self: center;
  }

  .home__actions {
    grid-area: actions;
    justify-content: flex-start;
    align-content: center;
  }

  .home__progress {
    grid-area: progress;
    justify-content: flex-start;
    margin-top: clamp(4px, 1.2vh, 12px);
    padding-top: clamp(8px, 1.4vh, 14px);
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 1100px) {
  .play-stage {
    grid-template-columns: minmax(0, 0.96fr) minmax(350px, 1.04fr);
  }

  .galaxy-list {
    gap: 12px;
  }
}

@media (max-width: 919px) {
  .screen--map.is-active {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
  }

  .galaxy-list {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: none;
    grid-auto-rows: auto;
    flex: 0 0 auto;
    min-height: auto;
    overflow: visible;
    padding-top: 10px;
  }

  .screen--play.is-active {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
  }

  .play-stage {
    grid-template-columns: minmax(0, 1fr);
    align-content: start;
    flex: 1 0 auto;
  }

  .play-visual-wrap {
    flex: 0 0 auto;
    height: clamp(230px, 34vh, 340px);
    min-height: 0;
  }

  .play-visual {
    overflow: auto;
  }

  .play-panel {
    overflow: visible;
  }

  .playbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
  }

  .intro {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    width: min(760px, 100%);
  }

  .intro__planet {
    order: 1;
  }

  .intro__card {
    order: 2;
    width: 100%;
  }

  .intro__actions .btn--primary {
    margin-left: 0;
  }

  .shop-grid {
    grid-template-columns: repeat(auto-fill, minmax(min(180px, 100%), 1fr));
  }

  .collection-grid {
    grid-template-columns: repeat(auto-fill, minmax(min(170px, 100%), 1fr));
  }

  .screen--map .level-card__title {
    font-size: clamp(0.78rem, 1.6vw, 0.9rem);
  }

  .screen--map .level-card__concept {
    font-size: 0.7rem;
  }
}

@media (max-width: 720px) {
  :root {
    --gutter: 14px;
    --safe-top: max(10px, env(safe-area-inset-top));
    --safe-bottom: max(10px, env(safe-area-inset-bottom));
    --r-xl: 26px;
    --r-lg: 22px;
  }

  .screen {
    padding-top: var(--safe-top);
    padding-bottom: var(--safe-bottom);
  }

  .home {
    gap: 8px;
    padding: 8px 0 14px;
  }

  .home__planet {
    min-height: 160px;
  }

  .home__title {
    font-size: clamp(2.55rem, 12vw, 4rem);
  }

  .home__title-bottom::after {
    right: -0.45em;
  }

  .home__tagline {
    font-size: 0.94rem;
    line-height: 1.65;
  }

  .home__actions {
    width: 100%;
  }

  .home__actions .btn {
    flex: 1 1 30%;
    padding-inline: 0.7rem;
    font-size: 0.86rem;
  }

  .home__progress {
    font-size: 0.76rem;
  }

  .intro {
    gap: 18px;
    padding: 10px 0 24px;
  }

  .intro__card {
    padding: 22px 18px;
  }

  .intro__actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .intro__actions .btn {
    width: 100%;
  }

  .play-stage {
    gap: 10px;
    padding-top: 8px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }

  .play-visual-wrap {
    min-height: clamp(190px, 30vh, 280px);
  }

  .play-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .play-actions .btn {
    width: 100%;
  }

  .result__card {
    padding: 24px 18px;
  }

  .result__actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .result__actions .btn--primary {
    grid-column: 1 / -1;
  }

  .shop-preview {
    margin-top: 10px;
  }

  .shop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .collection-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .map-footer .btn {
    flex: 1 1 40%;
  }
}

@media (max-width: 480px) {
  .home__actions .btn {
    flex: 1 1 100%;
  }

  .screen--map .level-card__title {
    font-size: 0.8rem;
    line-height: 1.35;
  }

  .screen--map .level-card__meta,
  .screen--map .level-card__concept {
    font-size: 0.68rem;
  }

  .shop-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .collection-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .result__actions {
    grid-template-columns: 1fr;
  }

  .result__actions .btn--primary {
    grid-column: auto;
  }
}

/* 平板短邊／矮視窗：壓縮星圖，必要時讓整頁捲動 */
@media (min-width: 920px) and (max-height: 740px) {
  .screen--map.is-active {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
  }

  .galaxy-list {
    grid-template-rows: repeat(2, auto);
    flex: 0 0 auto;
    min-height: auto;
    overflow: visible;
  }

  .home {
    row-gap: 5px;
  }

  .home__kicker {
    min-height: 28px;
  }

  .home__title {
    font-size: clamp(2.8rem, 5.5vw, 4.6rem);
  }

  .home__ship {
    min-height: 58px;
  }

  .galaxy-list {
    padding: 5px 0;
    gap: 10px;
  }

  .map-footer {
    padding-top: 4px;
  }

  .play-stage {
    padding-top: 7px;
    padding-bottom: 8px;
  }
}

/* 橫向手機：保留左右分欄，避免上下堆疊後超出視窗 */
@media (orientation: landscape) and (max-height: 560px) {
  :root {
    --gutter: 12px;
    --safe-top: max(6px, env(safe-area-inset-top));
    --safe-bottom: max(6px, env(safe-area-inset-bottom));
    --topbar-h: 50px;
  }

  .screen {
    padding-top: var(--safe-top);
    padding-bottom: var(--safe-bottom);
  }

  .home {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    grid-template-areas:
      "planet kicker"
      "planet title"
      "planet tagline"
      "planet cta"
      "planet actions"
      "progress progress";
    column-gap: 22px;
    row-gap: 4px;
    align-items: center;
    justify-items: start;
    text-align: left;
    padding: 5px 0;
  }

  .home__planet {
    grid-area: planet;
    min-height: 0;
  }

  .home__kicker {
    grid-area: kicker;
  }

  .home__title {
    grid-area: title;
    align-items: flex-start;
    font-size: clamp(2.1rem, 5.4vh, 3.2rem);
    line-height: 1;
  }

  .home__tagline {
    grid-area: tagline;
    font-size: 0.82rem;
    line-height: 1.45;
  }

  .home__cta {
    grid-area: cta;
    justify-content: flex-start;
  }

  .home__ship {
    display: none;
  }

  .home__actions {
    grid-area: actions;
    justify-content: flex-start;
  }

  .home__actions .btn {
    min-height: 44px;
    padding: 0.4rem 0.8rem;
    font-size: 0.78rem;
  }

  .home__progress {
    grid-area: progress;
    justify-content: flex-start;
    margin-top: 2px;
    padding-top: 4px;
  }

  .screen--map.is-active {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    overflow: hidden;
  }

  .galaxy-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 3px 0;
    overflow: hidden;
  }

  .map-footer {
    padding-top: 3px;
  }

  .screen--play.is-active {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
  }

  .play-stage {
    grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
    gap: 10px;
    padding-top: 5px;
    padding-bottom: 5px;
  }

  .play-visual-wrap {
    height: auto;
    min-height: 0;
  }

  .play-panel {
    overflow-y: auto;
  }

  .playbar {
    position: static;
  }

  .play-actions {
    display: flex;
  }

  .screen--intro.is-active {
    overflow-y: auto;
  }

  .intro {
    grid-template-columns: minmax(150px, 0.6fr) minmax(0, 1.4fr);
    gap: 20px;
    width: min(1000px, 100%);
    padding: 6px 0;
  }

  .intro__planet {
    order: 0;
  }

  .intro__card {
    order: 0;
    padding: 16px 20px;
  }

  .intro__story {
    margin-top: 8px;
    line-height: 1.6;
  }

  .intro__actions {
    display: flex;
    margin-top: 12px;
  }

  .intro__actions .btn {
    width: auto;
  }

  .result {
    width: min(680px, 100%);
    padding: 5px 0;
  }

  .result__card {
    padding: 14px 24px;
  }

  .result__card h1 {
    font-size: clamp(1.5rem, 5vh, 2.2rem);
  }

  .result__monster {
    margin-top: 10px;
  }

  .result__actions {
    display: flex;
    margin-top: 12px;
  }

  .result__actions .btn {
    min-height: 46px;
  }

  .shop-preview {
    margin-top: 6px;
  }
}

/* ------------------------------------------------------------
   12. 高對比與降低透明度偏好
   ------------------------------------------------------------ */
@media (prefers-contrast: more) {
  :root {
    --text-dim: #e7e4f5;
    --text-muted: #c9c5df;
    --line: rgba(255, 255, 255, 0.28);
    --line-strong: rgba(255, 255, 255, 0.5);
    --paper-muted: #4b3d63;
  }

  .pill,
  .home__kicker,
  .galaxy,
  .level-card {
    border-width: 2px;
  }
}