:root {
  color-scheme: light;
  --bg: #f7f0df;
  --surface: #fffaf0;
  --surface-strong: #fff4d7;
  --ink: #17212b;
  --muted: #637381;
  --accent: #0b74c9;
  --accent-strong: #075a9d;
  --good: #0a8f5a;
  --warn: #b96800;
  --danger: #b42318;
  --line: rgba(23, 33, 43, 0.14);
  --shadow: 0 24px 60px rgba(42, 35, 21, 0.16);
  --safe-bottom-extra: 0px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  min-height: 100svh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -20%, rgba(18, 168, 245, 0.18), transparent 34rem),
    linear-gradient(180deg, #fff7e7 0%, var(--bg) 58%, #efe2c7 100%);
}

button, select { font: inherit; }

button {
  border: 0;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

button:disabled { opacity: 0.4; cursor: not-allowed; }

.app-shell {
  width: min(100%, 720px);
  min-height: 100svh;
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 14px calc(max(18px, env(safe-area-inset-bottom)) + var(--safe-bottom-extra));
}

.screen { display: flex; flex-direction: column; min-height: calc(100svh - 80px); }
.screen[hidden] { display: none !important; }

@keyframes slideInRight {
  from { transform: translateX(60%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes slideInLeft {
  from { transform: translateX(-30%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.screen.slide-in-right { animation: slideInRight 0.28s ease-out forwards; }
.screen.slide-in-left { animation: slideInLeft 0.28s ease-out forwards; }

/* ===== Start Screen ===== */
.start-screen {
  display: grid;
  align-content: center;
  gap: 22px;
  padding: 28px 18px 42px;
}

.start-screen h1 {
  font-size: clamp(54px, 18vw, 96px);
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: -0.08em;
  color: var(--accent);
  text-align: center;
}

.hero-copy {
  font-size: clamp(15px, 4vw, 18px);
  color: var(--muted);
  text-align: center;
  margin: 0 auto;
  max-width: 320px;
}

.mode-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  width: min(100%, 360px);
  margin: 0 auto;
}

.mode-button {
  position: relative;
  min-height: 108px;
  padding: 16px 128px 16px 20px;
  border-radius: 24px;
  background:
    radial-gradient(circle at 72% 22%, rgba(18,168,245,0.22), transparent 5rem),
    rgba(255,250,240,0.92);
  border: 2px solid rgba(23,33,43,0.12);
  box-shadow: var(--shadow);
  text-align: left;
  transition: transform 0.15s;
}

.mode-button:active { transform: scale(0.97); }

.mode-button span {
  display: block;
  font-size: clamp(20px, 5.5vw, 24px);
  font-weight: 800;
  color: var(--ink);
}

.mode-button strong {
  position: absolute;
  top: 50%; right: 18px;
  transform: translateY(-50%);
  font-size: clamp(48px, 16vw, 72px);
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
}

.mode-button small {
  display: block;
  margin-top: 4px;
  font-size: clamp(14px, 3.8vw, 17px);
  color: var(--muted);
  font-weight: 400;
}

.mode-button.is-alt {
  background:
    radial-gradient(circle at 72% 22%, rgba(10,143,90,0.18), transparent 5rem),
    rgba(255,250,240,0.92);
}

.mode-button.is-alt strong { color: var(--good); }

.start-footer {
  text-align: center;
  margin-top: auto;
  padding-top: 16px;
}

/* ===== Buttons ===== */
.ghost-button {
  background: transparent;
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 12px;
  min-height: 44px;
}

.ghost-button:active { color: var(--ink); }

.primary-button {
  width: 100%;
  padding: 16px;
  font-size: 18px;
  font-weight: 800;
  border-radius: 18px;
  color: #fff;
  background: var(--accent);
  box-shadow: 0 8px 24px rgba(11,116,201,0.24);
  min-height: 56px;
}

.primary-button:active { background: var(--accent-strong); }

.secondary-button {
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 14px;
  color: var(--ink);
  background: rgba(255,250,240,0.82);
  border: 2px solid var(--line);
  min-height: 52px;
}

.secondary-button:active { background: rgba(255,250,240,0.6); }

.danger-button {
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 14px;
  color: var(--danger);
  background: rgba(180,35,24,0.08);
  border: 2px solid rgba(180,35,24,0.2);
  min-height: 52px;
}

.danger-button:active { background: rgba(180,35,24,0.16); }

.header-btn {
  padding: 0 18px;
  font-size: clamp(17px, 4.5vw, 19px);
  font-weight: 800;
  border-radius: 18px;
  min-height: 52px;
  min-width: 86px;
  white-space: nowrap;
}

.footer-btn {
  padding: 14px 32px;
  font-size: clamp(16px, 4.5vw, 18px);
  font-weight: 700;
  border-radius: 16px;
  min-height: 54px;
}

.full-btn {
  width: 100%;
  padding: 16px 20px;
  font-size: clamp(18px, 5vw, 22px);
  font-weight: 800;
  border-radius: 16px;
  min-height: 56px;
}

.action-btn {
  padding: 14px 16px;
  font-size: clamp(17px, 4.5vw, 19px);
  font-weight: 700;
  border-radius: 14px;
  min-height: 52px;
}

/* ===== Game Header ===== */
.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0 12px;
  gap: 8px;
}

.level-title-block { text-align: center; flex: 1; }

.eyebrow {
  font-size: clamp(12px, 3vw, 14px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0;
}

.level-title-block h2 {
  font-size: clamp(20px, 6vw, 28px);
  font-weight: 900;
  margin: 0;
}

/* ===== Level Grid ===== */
.level-screen { gap: 8px; }

.message-text {
  font-size: clamp(13px, 3.5vw, 15px);
  color: var(--muted);
  text-align: center;
  margin: 0 auto;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: repeat(5, minmax(0, 1fr));
  width: min(100%, 430px);
  margin: 4px auto 0;
  gap: 8px;
}

.level-button {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  min-height: 48px;
  border-radius: 17px;
  font-size: clamp(24px, 7vw, 36px);
  font-weight: 950;
  background: rgba(255,250,240,0.82);
  border: 2px solid var(--line);
  color: var(--ink);
  transition: transform 0.12s;
}

.level-button:active:not(:disabled) { transform: scale(0.94); }

.level-button.is-cleared {
  color: #fff;
  background: var(--good);
  border-color: var(--good);
}

.level-button.is-next {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 8px 20px rgba(11,116,201,0.24);
}

.level-button.is-locked {
  color: rgba(23,33,43,0.35);
  background: rgba(255,250,240,0.48);
  border-style: dashed;
  cursor: not-allowed;
}

.level-pager {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(100%, 430px);
  margin: 0 auto;
  gap: 8px;
}

/* ===== Status Panel ===== */
.status-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 8px;
}

.stat-block {
  min-height: 64px;
  padding: 10px 8px;
  border-radius: 16px;
  background: rgba(255,250,240,0.82);
  border: 2px solid var(--line);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.stat-label {
  font-size: clamp(16px, 4.5vw, 20px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.stat-block strong {
  font-size: clamp(22px, 6vw, 32px);
  font-weight: 900;
  color: var(--ink);
}

/* ===== Tubes Area ===== */
.tubes-area {
  flex: 1;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
  padding: 18px 0 34px;
}

.tubes-container {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  column-gap: clamp(4px, 1.5vw, 10px);
  row-gap: clamp(48px, 14vw, 72px);
  width: min(100%, 380px);
  margin: 0 auto;
}

.tube-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transform-origin: center bottom;
  transition: transform 0.16s ease, filter 0.16s ease;
  -webkit-tap-highlight-color: transparent;
}

.tube-wrapper:active { transform: scale(0.96); }

.tube-glass {
  width: 100%;
  aspect-ratio: 0.38;
  max-width: 56px;
  border: 2px solid rgba(23,33,43,0.22);
  border-top: none;
  border-radius: 0 0 16px 16px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.68), rgba(255,255,255,0.42));
  position: relative;
  overflow: hidden;
  box-shadow:
    0 10px 22px rgba(42,35,21,0.12),
    inset 0 0 16px rgba(255,255,255,0.24);
}

.tube-glass::before {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  height: 10px;
  border: 2px solid rgba(23,33,43,0.22);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  background: rgba(255,255,255,0.45);
}

.tube-liquid {
  position: absolute;
  top: 6px;
  bottom: 4px;
  left: 3px;
  right: 3px;
  display: flex;
  flex-direction: column-reverse;
  border-radius: 0 0 12px 12px;
  overflow: hidden;
}

.tube-cell {
  flex: 1;
  min-height: 4px;
  position: relative;
  overflow: hidden;
  transition: background-color 0.22s ease, transform 0.22s ease, opacity 0.22s ease;
}

.tube-cell.filled {
  border-top: 1px solid rgba(255,255,255,0.3);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.22),
    inset 0 -4px 6px rgba(0,0,0,0.12);
}

.tube-cell.filled::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.2), rgba(255,255,255,0) 45%),
    linear-gradient(90deg, rgba(255,255,255,0.1), rgba(255,255,255,0) 28%);
  pointer-events: none;
}

.tube-cell.filled::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -1px;
  height: 5px;
  background: linear-gradient(180deg, rgba(255,255,255,0.36), rgba(255,255,255,0));
  opacity: 0.85;
  pointer-events: none;
}

.tube-cell.filled.joined-below {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.tube-cell.filled.joined-above {
  border-top-color: rgba(255,255,255,0.05);
}

.tube-cell.filled.top-layer {
  border-top-color: rgba(255,255,255,0.28);
}

.tube-cell.filled.bottom-layer {
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.08),
    inset 0 -2px 4px rgba(0,0,0,0.1);
}

/* Selected */
.tube-wrapper.selected {
  transform: translateY(-8px) scale(1.03);
  filter: drop-shadow(0 14px 18px rgba(11,116,201,0.22));
}

.tube-wrapper.selected .tube-glass {
  border-color: var(--accent);
  box-shadow:
    0 0 0 3px rgba(11,116,201,0.18),
    0 0 22px rgba(11,116,201,0.34),
    0 14px 26px rgba(42,35,21,0.16);
  animation: pulse-blue 1s ease-in-out infinite;
}

.tube-wrapper.selected .tube-glass::before {
  border-color: rgba(11,116,201,0.6);
}

@keyframes pulse-blue {
  0%, 100% {
    box-shadow:
      0 0 0 3px rgba(11,116,201,0.14),
      0 0 18px rgba(11,116,201,0.28),
      0 14px 26px rgba(42,35,21,0.16);
  }
  50% {
    box-shadow:
      0 0 0 4px rgba(11,116,201,0.24),
      0 0 28px rgba(11,116,201,0.42),
      0 14px 26px rgba(42,35,21,0.16);
  }
}

.tube-wrapper.is-pouring {
  z-index: 3;
  transition: transform 0.5s ease;
}

.tube-wrapper.is-pouring .tube-glass {
  box-shadow:
    0 18px 30px rgba(42,35,21,0.18),
    inset 0 0 16px rgba(255,255,255,0.24);
}

.tube-wrapper.is-pouring .tube-liquid {
  animation: liquid-shift 0.5s cubic-bezier(0.22, 0.8, 0.24, 1);
}

.tube-wrapper.pour-left {
  animation: pour-tilt-left 0.5s cubic-bezier(0.22, 0.8, 0.24, 1);
}

.tube-wrapper.pour-right {
  animation: pour-tilt-right 0.5s cubic-bezier(0.22, 0.8, 0.24, 1);
}

.tube-wrapper.pour-center {
  animation: pour-lift-center 0.5s cubic-bezier(0.22, 0.8, 0.24, 1);
}

.tube-wrapper.is-receiving .tube-liquid {
  animation: receive-bounce 0.5s cubic-bezier(0.22, 0.8, 0.24, 1);
}

.tube-wrapper.is-receiving .tube-cell.just-poured {
  animation: poured-cell 0.5s cubic-bezier(0.22, 0.8, 0.24, 1);
}

@keyframes liquid-shift {
  0%, 16% { transform: translateY(0) scaleY(1); }
  40%, 74% { transform: translateY(4px) scaleY(0.965); }
  100% { transform: translateY(0) scaleY(1); }
}

@keyframes pour-tilt-left {
  0% { transform: translateY(0) rotate(0deg); }
  14% { transform: translate(-3px, -6px) rotate(-5deg); }
  38%, 76% { transform: translate(-18px, -24px) rotate(-24deg); }
  100% { transform: translateY(0) rotate(0deg); }
}

@keyframes pour-tilt-right {
  0% { transform: translateY(0) rotate(0deg); }
  14% { transform: translate(3px, -6px) rotate(5deg); }
  38%, 76% { transform: translate(18px, -24px) rotate(24deg); }
  100% { transform: translateY(0) rotate(0deg); }
}

@keyframes pour-lift-center {
  0% { transform: translateY(0) rotate(0deg); }
  18% { transform: translateY(-8px) scale(1.01); }
  42%, 76% { transform: translateY(-22px) scale(1.03); }
  100% { transform: translateY(0) rotate(0deg) scale(1); }
}

@keyframes receive-bounce {
  0%, 48% { transform: scaleY(1); }
  76% { transform: scaleY(1.06); }
  100% { transform: scaleY(1); }
}

@keyframes poured-cell {
  0%, 46% { transform: translateY(-34%) scaleY(0.78); opacity: 0.02; }
  78% { transform: translateY(7%) scaleY(1.04); opacity: 1; }
  100% { transform: translateY(0) scaleY(1); opacity: 1; }
}

/* Shake */
.tube-wrapper.shake { animation: shake 0.4s ease; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15% { transform: translateX(-5px); }
  30% { transform: translateX(5px); }
  45% { transform: translateX(-4px); }
  60% { transform: translateX(4px); }
  75% { transform: translateX(-2px); }
  90% { transform: translateX(2px); }
}

/* Celebrate */
.tube-wrapper.celebrate .tube-glass {
  animation: celebrate-flash 0.5s ease;
}

@keyframes celebrate-flash {
  0% { box-shadow: 0 0 0 rgba(11,116,201,0), 0 4px 12px rgba(42,35,21,0.1); }
  50% { box-shadow: 0 0 24px rgba(11,116,201,0.7), 0 0 48px rgba(11,116,201,0.3), 0 4px 12px rgba(42,35,21,0.1); transform: scale(1.05); }
  100% { box-shadow: 0 0 0 rgba(11,116,201,0), 0 4px 12px rgba(42,35,21,0.1); transform: scale(1); }
}

/* ===== Action Row ===== */
.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 28px 0;
  padding-bottom: max(32px, env(safe-area-inset-bottom));
}

/* ===== Settings ===== */
.settings-body {
  padding: 16px 0;
}

.settings-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(15px, 4vw, 17px);
  font-weight: 600;
}

/* ===== Overlays ===== */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(23,33,43,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 20px;
}

.overlay[hidden] { display: none !important; }

.win-card, .menu-card {
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 28px;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  max-width: 340px;
  width: 100%;
  box-shadow: var(--shadow);
  text-align: center;
}

.win-emoji {
  font-size: 48px;
  animation: bounce-in 0.5s ease;
}

@keyframes bounce-in {
  0% { transform: scale(0); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.win-card h2 {
  font-size: 24px;
  font-weight: 900;
  color: var(--accent);
}

.win-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 100%;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-strong);
  color: var(--ink);
  padding: 12px 24px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 700;
  z-index: 200;
  box-shadow: 0 8px 30px rgba(42,35,21,0.2);
  border: 2px solid var(--line);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.toast[hidden] { display: block; }
.toast.toast-show { opacity: 1; }

/* ===== Mobile: max 560px ===== */
@media (max-width: 560px) {
  .app-shell { padding: max(10px, env(safe-area-inset-top)) 10px calc(max(10px, env(safe-area-inset-bottom)) + var(--safe-bottom-extra)); }
  .start-screen { gap: 18px; padding: 20px 12px 32px; }
  .start-screen h1 { font-size: clamp(44px, 15vw, 62px); }
  .mode-button { min-height: 92px; padding: 14px 100px 14px 16px; border-radius: 20px; }
  .mode-button strong { font-size: clamp(40px, 14vw, 60px); right: 14px; }
  .stat-block { min-height: 56px; border-radius: 14px; padding: 8px 6px; }
  .stat-block strong { font-size: clamp(20px, 5.5vw, 28px); }
  .stat-label { font-size: clamp(15px, 4vw, 18px); }
  .tubes-container { width: min(100%, 340px); column-gap: clamp(3px, 1.2vw, 8px); row-gap: clamp(40px, 12vw, 60px); }
  .tube-glass { border-radius: 0 0 12px 12px; }
  .tube-glass::before { height: 8px; border-radius: 5px 5px 0 0; }
  .header-btn { padding: 0 14px; font-size: clamp(16px, 4.2vw, 18px); min-height: 48px; min-width: 72px; }
  .footer-btn { padding: 12px 28px; font-size: clamp(15px, 4vw, 17px); min-height: 50px; }
  .full-btn { padding: 14px 18px; font-size: clamp(17px, 4.5vw, 19px); min-height: 52px; }
  .action-btn { padding: 12px 14px; font-size: clamp(16px, 4vw, 18px); min-height: 48px; }
}

/* ===== Mobile: max 390px ===== */
@media (max-width: 390px) {
  .level-grid { width: min(100%, 350px); gap: 6px; }
  .level-button { min-height: 42px; border-radius: 13px; font-size: clamp(20px, 6vw, 30px); }
  .tubes-container { width: min(100%, 310px); column-gap: 3px; row-gap: clamp(36px, 10vw, 52px); }
  .tube-glass { border-radius: 0 0 10px 10px; }
  .mode-button { min-height: 84px; border-radius: 18px; }
  .mode-button strong { font-size: clamp(36px, 13vw, 52px); }
  .stat-block { min-height: 50px; }
  .stat-block strong { font-size: clamp(18px, 5vw, 26px); }
  .stat-label { font-size: clamp(14px, 3.5vw, 16px); }
}

/* ===== Landscape ===== */
@media (orientation: landscape) and (max-height: 500px) {
  .start-screen { gap: 10px; padding: 10px 12px; }
  .start-screen h1 { font-size: 36px; }
  .mode-button { min-height: 64px; padding: 10px 80px 10px 14px; }
  .mode-button strong { font-size: 36px; }
  .tubes-container { width: min(100%, 500px); row-gap: clamp(8px, 2vw, 14px); }
  .tube-glass { max-width: 44px; }
  .status-panel { grid-template-columns: repeat(2, 1fr); gap: 4px; }
  .stat-block { min-height: 36px; padding: 4px; }
  .stat-block strong { font-size: 18px; }
  .stat-label { font-size: 10px; }
  .action-row { padding: 4px 0; }
}