:root {
  color-scheme: dark;

  /* --- ตัวแปรควบคุมขนาดและการแสดงผลแบบเรียลไทม์ (ปรับละเอียดทีละ 1%) --- */
  --user-font-family: 'Prompt', sans-serif;
  --user-font-scale: 1;         /* อัตราส่วนฟอนต์ทั่วไป (0.70 - 1.50) */
  --user-q-font-scale: 1;       /* อัตราส่วนฟอนต์หัวข้อโจทย์ (0.70 - 1.60) */
  --user-card-scale: 1;         /* อัตราส่วนขนาดการ์ดและกล่อง (0.80 - 1.40) */

  /* --- ธีมสีเริ่มต้น: รัตติกาลคราม (Default Indigo) --- */
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --accent-gold: #F59E0B;
  --accent-green: #10B981;
  --accent-rose: #F43F5E;
  --accent-cyan: #06B6D4;
  --bg-dark: #0F172A;
  --bg-gradient: linear-gradient(135deg, #0F172A 0%, #1E1B4B 50%, #311042 100%);
  --card-bg: rgba(255, 255, 255, 0.98);
  --text-dark: #0F172A;
  --text-muted: #64748B;
  --text-stage-head: #FFFFFF;
  --stage-nav-border: rgba(255, 255, 255, 0.15);
  --stage-nav-text: #A5B4FC;

  /* สีแถบนำทาง (ปรับตามธีม) */
  --nav-bg: rgba(15, 23, 42, 0.92);
  --nav-border: rgba(255, 255, 255, 0.16);
  --nav-text: #FFFFFF;
  --nav-text-muted: #94A3B8;

  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --shadow-app: 0 4px 14px rgba(0, 0, 0, 0.12);
  --shadow-3d: 0 6px 0 #CBD5E1, 0 12px 20px rgba(0,0,0,0.15);
}

/* ================= คลังธีมสีพรีเมียม 14 รูปแบบ ================= */
/* 1. ธีมตามระบบเครื่อง (Auto System) */
@media (prefers-color-scheme: light) {
  body[data-theme="system"] {
    --bg-dark: #F1F5F9;
    --bg-gradient: linear-gradient(135deg, #F8FAFC 0%, #EEF2FF 50%, #E0E7FF 100%);
    --primary: #4F46E5;
    --primary-dark: #3730A3;
    --text-stage-head: #0F172A;
    --stage-nav-border: rgba(15, 23, 42, 0.15);
    --stage-nav-text: #3730A3;
    --nav-bg: rgba(255, 255, 255, 0.94);
    --nav-border: rgba(15, 23, 42, 0.12);
    --nav-text: #0F172A;
    --nav-text-muted: #64748B;
    color: #0F172A;
  }
}
@media (prefers-color-scheme: dark) {
  body[data-theme="system"] {
    --bg-dark: #0F172A;
    --bg-gradient: linear-gradient(135deg, #0F172A 0%, #1E1B4B 50%, #311042 100%);
    --primary: #4F46E5;
    --primary-dark: #3730A3;
    --nav-bg: rgba(15, 23, 42, 0.92);
    --nav-border: rgba(255, 255, 255, 0.16);
    --nav-text: #FFFFFF;
    --nav-text-muted: #94A3B8;
  }
}

/* 2. รัตติกาลคราม (Indigo) */
body[data-theme="indigo"] {
  --bg-dark: #0F172A;
  --bg-gradient: linear-gradient(135deg, #0F172A 0%, #1E1B4B 50%, #311042 100%);
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --nav-bg: rgba(15, 23, 42, 0.92);
  --nav-border: rgba(255, 255, 255, 0.16);
  --nav-text: #FFFFFF;
  --nav-text-muted: #94A3B8;
}

/* 3. มิดไนท์แบล็ค (Midnight Obsidian) */
body[data-theme="midnight"] {
  --bg-dark: #090A0F;
  --bg-gradient: linear-gradient(135deg, #090A0F 0%, #12141D 50%, #1B1E2B 100%);
  --primary: #3B82F6;
  --primary-dark: #1D4ED8;
  --nav-bg: rgba(9, 10, 15, 0.94);
  --nav-border: rgba(255, 255, 255, 0.12);
  --nav-text: #FFFFFF;
  --nav-text-muted: #94A3B8;
}

/* 4. มรกตเอเดน (Emerald Eden) */
body[data-theme="emerald"] {
  --bg-dark: #062016;
  --bg-gradient: linear-gradient(135deg, #062016 0%, #0B3324 50%, #114B36 100%);
  --primary: #10B981;
  --primary-dark: #047857;
  --nav-bg: rgba(6, 32, 22, 0.94);
  --nav-border: rgba(16, 185, 129, 0.25);
  --nav-text: #FFFFFF;
  --nav-text-muted: #A7F3D0;
}

/* 5. ม่วงรอยัล (Royal Velvet) */
body[data-theme="royal"] {
  --bg-dark: #1C0A35;
  --bg-gradient: linear-gradient(135deg, #1C0A35 0%, #2E1065 50%, #4C1D95 100%);
  --primary: #8B5CF6;
  --primary-dark: #6D28D9;
  --nav-bg: rgba(28, 10, 53, 0.94);
  --nav-border: rgba(139, 92, 246, 0.25);
  --nav-text: #FFFFFF;
  --nav-text-muted: #DDD6FE;
}

/* 6. ทองคำบริสุทธิ์ (Golden Grace) */
body[data-theme="golden"] {
  --bg-dark: #1E1705;
  --bg-gradient: linear-gradient(135deg, #1E1705 0%, #362908 50%, #4D3B0D 100%);
  --primary: #F59E0B;
  --primary-dark: #B45309;
  --nav-bg: rgba(30, 23, 5, 0.94);
  --nav-border: rgba(245, 158, 11, 0.28);
  --nav-text: #FFFFFF;
  --nav-text-muted: #FDE68A;
}

/* 7. โอเชี่ยนแซฟไฟร์ (Ocean Sapphire) */
body[data-theme="ocean"] {
  --bg-dark: #05192D;
  --bg-gradient: linear-gradient(135deg, #05192D 0%, #0A2F54 50%, #0F457A 100%);
  --primary: #0284C7;
  --primary-dark: #0369A1;
  --nav-bg: rgba(5, 25, 45, 0.94);
  --nav-border: rgba(2, 132, 199, 0.25);
  --nav-text: #FFFFFF;
  --nav-text-muted: #BAE6FD;
}

/* 8. ทับทิมสยาม (Crimson Glory) */
body[data-theme="crimson"] {
  --bg-dark: #2A080C;
  --bg-gradient: linear-gradient(135deg, #2A080C 0%, #450A10 50%, #68101A 100%);
  --primary: #E11D48;
  --primary-dark: #9F1239;
  --nav-bg: rgba(42, 8, 12, 0.94);
  --nav-border: rgba(225, 29, 72, 0.25);
  --nav-text: #FFFFFF;
  --nav-text-muted: #FECDD3;
}

/* 9. นีออนไซเบอร์ (Cyberpunk Neon) */
body[data-theme="cyberpunk"] {
  --bg-dark: #0A0A16;
  --bg-gradient: linear-gradient(135deg, #0A0A16 0%, #160B29 50%, #290838 100%);
  --primary: #EC4899;
  --primary-dark: #BE185D;
  --nav-bg: rgba(10, 10, 22, 0.94);
  --nav-border: rgba(236, 72, 153, 0.3);
  --nav-text: #FFFFFF;
  --nav-text-muted: #FBCFE8;
}

/* 10. หินชนวนคาร์บอน (Carbon Slate) */
body[data-theme="slate"] {
  --bg-dark: #1E293B;
  --bg-gradient: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #334155 100%);
  --primary: #64748B;
  --primary-dark: #475569;
  --nav-bg: rgba(30, 41, 59, 0.94);
  --nav-border: rgba(255, 255, 255, 0.16);
  --nav-text: #FFFFFF;
  --nav-text-muted: #CBD5E1;
}

/* 11. สว่าง โมเดิร์น (Clean Light) */
body[data-theme="light-clean"] {
  --bg-dark: #F8FAFC;
  --bg-gradient: linear-gradient(135deg, #FFFFFF 0%, #F1F5F9 50%, #E2E8F0 100%);
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --text-stage-head: #0F172A;
  --stage-nav-border: rgba(15, 23, 42, 0.15);
  --stage-nav-text: #3730A3;
  --nav-bg: rgba(255, 255, 255, 0.94);
  --nav-border: rgba(15, 23, 42, 0.12);
  --nav-text: #0F172A;
  --nav-text-muted: #64748B;
  color: #0F172A;
}

/* 12. คัมภีร์ซีเปีย (Antique Parchment) */
body[data-theme="parchment"] {
  --bg-dark: #F7F3E9;
  --bg-gradient: linear-gradient(135deg, #FAF7EE 0%, #EFE8D6 50%, #E5DAC1 100%);
  --primary: #B45309;
  --primary-dark: #78350F;
  --text-stage-head: #451A03;
  --stage-nav-border: rgba(69, 26, 3, 0.15);
  --stage-nav-text: #78350F;
  --nav-bg: rgba(247, 243, 233, 0.95);
  --nav-border: rgba(180, 83, 9, 0.25);
  --nav-text: #451A03;
  --nav-text-muted: #854D0E;
  color: #451A03;
}

/* 13. โรสโกลด์ (Warm Rose) */
body[data-theme="rose-gold"] {
  --bg-dark: #FFF1F2;
  --bg-gradient: linear-gradient(135deg, #FFF1F2 0%, #FFE4E6 50%, #FECDD3 100%);
  --primary: #E11D48;
  --primary-dark: #9F1239;
  --text-stage-head: #881337;
  --stage-nav-border: rgba(136, 19, 55, 0.15);
  --stage-nav-text: #9F1239;
  --nav-bg: rgba(255, 241, 242, 0.95);
  --nav-border: rgba(225, 29, 72, 0.2);
  --nav-text: #881337;
  --nav-text-muted: #9F1239;
  color: #881337;
}

/* 14. นอร์ดิกฟรอสต์ (Nordic Frost) */
body[data-theme="nordic-frost"] {
  --bg-dark: #F0FDF4;
  --bg-gradient: linear-gradient(135deg, #F0FDF4 0%, #DCFCE7 50%, #BBF7D0 100%);
  --primary: #059669;
  --primary-dark: #047857;
  --text-stage-head: #064E3B;
  --stage-nav-border: rgba(6, 78, 59, 0.15);
  --stage-nav-text: #047857;
  --nav-bg: rgba(240, 253, 244, 0.95);
  --nav-border: rgba(5, 150, 105, 0.22);
  --nav-text: #064E3B;
  --nav-text-muted: #047857;
  color: #064E3B;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  font-family: var(--user-font-family);
}

html {
  background-color: var(--bg-dark) !important;
  color-scheme: dark;
  height: 100%;
}

body {
  background: var(--bg-gradient);
  background-color: var(--bg-dark);
  min-height: 100vh;
  min-height: 100dvh;
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-user-select: none;
  user-select: none;
  overscroll-behavior-y: none;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ================= CANVAS แสดงเกล็ดหิมะ / ฟองประกายฉลอง ================= */
#snow-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 99999;
  display: none;
}

/* ================= 1. Responsive App Wrapper (เว้นระยะบน-ล่างให้เนื้อหาไม่โดนแถบบัง) ================= */
.app-wrapper {
  width: 100%;
  max-width: 96%;
  margin: 0 auto;
  padding: calc(76px + env(safe-area-inset-top, 8px)) 12px calc(96px + env(safe-area-inset-bottom, 16px));
  flex: 1;
  display: flex;
  flex-direction: column;
}

@media (min-width: 768px) {
  .app-wrapper {
    max-width: 94%;
    padding: calc(96px + env(safe-area-inset-top, 16px)) 24px calc(125px + env(safe-area-inset-bottom, 20px));
  }
}

/* สำหรับ iPad แนวนอน (Landscape): ปรับระยะเนื้อหาให้เว้นห่างลงมา ไม่ซ้อนทับส่วนหัว */
@media (min-width: 768px) and (orientation: landscape) {
  .app-wrapper {
    padding: calc(115px + env(safe-area-inset-top, 24px)) 24px calc(125px + env(safe-area-inset-bottom, 20px));
  }
}

@media (min-width: 1200px) {
  .app-wrapper {
    max-width: 1320px;
    padding: calc(122px + env(safe-area-inset-top, 24px)) 32px calc(130px + env(safe-area-inset-bottom, 20px));
  }
}

/* ================= 2. แถบบน (ถอดพื้นหลังออก 100% + ปรับระยะแนวนอนบน iPad ไม่ให้ชิดบนเกินไป) ================= */
.top-navbar {
  position: fixed !important;
  top: max(16px, calc(env(safe-area-inset-top, 0px) + 12px)) !important;
  left: 50% !important;
  transform: translateX(-50%) !important;
  width: 96% !important;
  max-width: 96% !important;
  z-index: 1000 !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  padding: 0 !important;
  height: auto !important;
  min-height: 48px !important;
  background: transparent !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  pointer-events: none;
}

@media (min-width: 768px) {
  .top-navbar {
    width: 94% !important;
    max-width: 94% !important;
    top: max(24px, calc(env(safe-area-inset-top, 0px) + 18px)) !important;
  }
}

/* แก้ปัญหาสำคัญ: บน iPad แนวนอน (Landscape) ขยับลงมา 38px – 42px ไม่ติดขอบบนและไม่ชนแถบสถานะ */
@media (min-width: 768px) and (orientation: landscape) {
  .top-navbar {
    top: max(38px, calc(env(safe-area-inset-top, 0px) + 26px)) !important;
  }
}

@media (min-width: 1200px) {
  .top-navbar {
    max-width: 1320px !important;
    top: 40px !important;
  }
}

.top-navbar > * {
  pointer-events: auto;
}

.top-navbar > div:first-child {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.btn-nav-back {
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid var(--nav-border);
  color: var(--nav-text);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.85rem !important;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

@media (min-width: 768px) {
  .btn-nav-back {
    padding: 8px 20px;
    font-size: 1rem !important;
  }
}

.btn-nav-back:active { transform: scale(0.94); }

/* สไตล์ชื่อและไอคอนแอพ มุมซ้ายบน */
.brand-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.15rem !important;
  font-weight: 800;
  white-space: nowrap;
  color: var(--text-stage-head) !important;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
}

@media (min-width: 768px) {
  .brand-badge { font-size: 1.5rem !important; }
}

/* ไอคอนแอพจริง สวย หรู คมชัด มีขอบและเงา */
.brand-app-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
  flex-shrink: 0;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
}

@media (min-width: 768px) {
  .brand-app-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
  }
}

.brand-divider {
  color: var(--text-stage-head);
  opacity: 0.35;
  font-weight: 300;
  font-size: 1.3em;
  margin: 0 2px;
}

/* สไตล์ป้ายแต้มคะแนน มุมขวาบนพอดี */
.score-badge {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  padding: 8px 18px;
  border-radius: 50px;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.38), 0 2px 0 #B45309;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem !important;
  white-space: nowrap;
  flex-shrink: 0;
  color: white !important;
  transition: transform 0.15s ease;
}

@media (min-width: 768px) {
  .score-badge {
    padding: 10px 24px;
    font-size: 1.25rem !important;
  }
}

/* ================= 3. Hero Header ================= */
.hero-title {
  text-align: center;
  color: var(--text-stage-head);
  margin: 8px 0 18px;
}

.hero-title h1 {
  font-size: calc(1.45rem * var(--user-q-font-scale));
  font-weight: 800;
  letter-spacing: -0.3px;
}

.hero-title p {
  color: var(--text-muted);
  font-size: calc(0.88rem * var(--user-font-scale));
  margin-top: 4px;
}

@media (min-width: 768px) {
  .hero-title { margin: 18px 0 28px; }
  .hero-title h1 { font-size: calc(2.4rem * var(--user-q-font-scale)); }
  .hero-title p { font-size: calc(1.15rem * var(--user-font-scale)); margin-top: 6px; }
}

/* ================= 4. การ์ดเมนูหน้าแรก ================= */
.menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: calc(14px * var(--user-card-scale));
  width: 100%;
}

@media (min-width: 768px) {
  .menu-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: calc(24px * var(--user-card-scale));
  }
}

.menu-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: calc(18px * var(--user-card-scale)) calc(14px * var(--user-card-scale));
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow-app);
  border: 2px solid transparent;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  color: var(--text-dark);
}

@media (min-width: 768px) {
  .menu-card {
    padding: calc(32px * var(--user-card-scale)) calc(20px * var(--user-card-scale));
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-3d);
  }
}

.menu-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: 0 14px 0 #CBD5E1, 0 22px 30px rgba(0,0,0,0.25);
}

.menu-card:active { transform: scale(0.96); }

.card-icon-3d {
  font-size: calc(2.5rem * var(--user-card-scale));
  margin-bottom: 8px;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.12));
}

@media (min-width: 768px) {
  .card-icon-3d {
    font-size: calc(3.8rem * var(--user-card-scale));
    margin-bottom: 16px;
  }
}

.card-tag {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #EEF2FF;
  color: var(--primary);
  font-size: calc(0.7rem * var(--user-font-scale));
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 20px;
}

@media (min-width: 768px) {
  .card-tag {
    top: 14px;
    right: 14px;
    font-size: calc(0.82rem * var(--user-font-scale));
    padding: 5px 12px;
  }
}

.menu-card h3 {
  font-size: calc(1rem * var(--user-font-scale));
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 4px;
}

@media (min-width: 768px) {
  .menu-card h3 {
    font-size: calc(1.4rem * var(--user-font-scale));
    margin-bottom: 8px;
  }
}

.menu-card p {
  color: var(--text-muted);
  font-size: calc(0.78rem * var(--user-font-scale));
  line-height: 1.35;
}

@media (min-width: 768px) {
  .menu-card p {
    font-size: calc(1rem * var(--user-font-scale));
    line-height: 1.5;
  }
}

/* ================= 5. TOPIC SELECTION ================= */
.topic-header-box {
  text-align: center;
  margin-bottom: 20px;
}

.topic-header-box h2 {
  font-size: calc(1.4rem * var(--user-q-font-scale));
  font-weight: 800;
  color: var(--text-stage-head);
  margin-bottom: 6px;
}

.topic-header-box p {
  font-size: calc(0.9rem * var(--user-font-scale));
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .topic-header-box h2 { font-size: calc(2rem * var(--user-q-font-scale)); }
  .topic-header-box p { font-size: calc(1.15rem * var(--user-font-scale)); }
  .topic-header-box { margin-bottom: 28px; }
}

.topic-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(12px * var(--user-card-scale));
}

@media (min-width: 768px) {
  .topic-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: calc(18px * var(--user-card-scale));
  }
}

@media (min-width: 1024px) {
  .topic-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: calc(22px * var(--user-card-scale));
  }
}

.topic-card {
  background: white;
  border: 2px solid #E2E8F0;
  border-radius: var(--radius-lg);
  padding: calc(16px * var(--user-card-scale)) calc(20px * var(--user-card-scale));
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.15s ease;
  box-shadow: 0 4px 0 #CBD5E1;
  color: var(--text-dark);
}

@media (min-width: 768px) {
  .topic-card {
    padding: calc(24px * var(--user-card-scale)) calc(26px * var(--user-card-scale));
    border-radius: var(--radius-xl);
    box-shadow: 0 6px 0 #CBD5E1;
  }
  .topic-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.2);
  }
}

.topic-card:active { transform: scale(0.97); }

.topic-card-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topic-card-icon {
  font-size: calc(1.8rem * var(--user-card-scale));
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .topic-card-icon { font-size: calc(2.6rem * var(--user-card-scale)); }
}

.topic-card-title {
  font-size: calc(1.05rem * var(--user-font-scale));
  font-weight: 800;
  color: var(--text-dark);
}

@media (min-width: 768px) {
  .topic-card-title { font-size: calc(1.3rem * var(--user-font-scale)); }
}

.topic-card-meta {
  font-size: calc(0.82rem * var(--user-font-scale));
  color: var(--text-muted);
  margin-top: 3px;
}

.topic-card-badge {
  background: #EEF2FF;
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: calc(0.85rem * var(--user-font-scale));
  font-weight: 800;
  white-space: nowrap;
}

@media (min-width: 768px) {
  .topic-card-badge {
    font-size: calc(1rem * var(--user-font-scale));
    padding: 8px 18px;
  }
}

.topic-card.all-topic {
  background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
  border-color: #818CF8;
}

.topic-card.all-topic .topic-card-badge {
  background: var(--primary);
  color: white;
}

/* ================= 6. GAME STAGE (ปลดล็อคการ์ดขาวใหญ่ ลอยตัว 90-95%) ================= */
.game-stage {
  display: none;
  background: transparent !important;
  box-shadow: none !important;
  border: none !important;
  padding: 0 !important;
  width: 100%;
  max-width: 100% !important;
  margin: 0 auto;
  animation: fadeIn 0.15s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.stage-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--stage-nav-border);
  padding-bottom: 14px;
  color: var(--text-stage-head);
}

.stage-nav span, #stage-badge-info, #topic-stage-mode-title {
  font-size: calc(0.95rem * var(--user-font-scale));
  font-weight: 800;
  color: var(--stage-nav-text);
}

@media (min-width: 768px) {
  .stage-nav { margin-bottom: 28px; padding-bottom: 18px; }
  .stage-nav span, #stage-badge-info, #topic-stage-mode-title {
    font-size: calc(1.3rem * var(--user-font-scale));
  }
}

.btn-pill-back {
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: var(--text-stage-head);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: calc(0.88rem * var(--user-font-scale));
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  backdrop-filter: blur(8px);
}

@media (min-width: 768px) {
  .btn-pill-back {
    padding: 10px 24px;
    font-size: calc(1.05rem * var(--user-font-scale));
  }
}

.btn-pill-back:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-pill-back:active { transform: scale(0.95); }

/* ================= 7. โหมดคำถาม ================= */
#stage-q-text {
  color: var(--text-stage-head) !important;
  font-size: calc(1.35rem * var(--user-q-font-scale)) !important;
  line-height: 1.55 !important;
  font-weight: 800 !important;
  margin-bottom: 22px !important;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
  letter-spacing: -0.2px;
}

@media (min-width: 768px) {
  #stage-q-text {
    font-size: calc(2.2rem * var(--user-q-font-scale)) !important;
    line-height: 1.6 !important;
    margin-bottom: 34px !important;
    letter-spacing: -0.5px;
  }
}

.q-highlight {
  color: #FBBF24 !important;
  font-size: 1.15em !important;
  font-weight: 800 !important;
  text-shadow: 0 0 16px rgba(251, 191, 36, 0.5);
  display: inline-block;
  padding: 0 4px;
}

.q-image-frame {
  width: 100%;
  max-height: calc(260px * var(--user-card-scale));
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin: 14px 0 22px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

@media (min-width: 768px) {
  .q-image-frame {
    max-height: calc(440px * var(--user-card-scale));
    border-radius: var(--radius-xl);
    margin: 18px 0 30px;
  }
}

.choices-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(14px * var(--user-card-scale));
  width: 100%;
}

@media (min-width: 768px) {
  .choices-stack {
    grid-template-columns: 1fr 1fr;
    gap: calc(22px * var(--user-card-scale));
  }
}

/* ตัวเลือกคำถาม (รองรับกล่องยืนยันกะทัดรัดภายในข้อ) */
.choice-btn {
  background: #FFFFFF;
  border: 2px solid #CBD5E1;
  padding: calc(16px * var(--user-card-scale)) calc(20px * var(--user-card-scale));
  border-radius: var(--radius-lg);
  text-align: left;
  font-size: calc(1.15rem * var(--user-font-scale));
  font-weight: 700;
  color: var(--text-dark);
  cursor: pointer;
  box-shadow: 0 4px 0 #CBD5E1, 0 10px 20px rgba(0, 0, 0, 0.22);
  transition: all 0.15s ease;
  min-height: calc(68px * var(--user-card-scale));
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.45;
  position: relative;
}

@media (min-width: 768px) {
  .choice-btn {
    padding: calc(22px * var(--user-card-scale)) calc(26px * var(--user-card-scale));
    font-size: calc(1.6rem * var(--user-font-scale)) !important;
    min-height: calc(100px * var(--user-card-scale));
    border-radius: 20px;
    box-shadow: 0 6px 0 #CBD5E1, 0 14px 25px rgba(0, 0, 0, 0.28);
  }
  .choice-btn:hover {
    background: #F8FAFC;
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 9px 0 #CBD5E1, 0 18px 30px rgba(79, 70, 229, 0.25);
  }
}

.choice-btn:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #CBD5E1;
}

.choice-btn.pending-selected {
  border-color: #F59E0B !important;
  background: #FFFBEB !important;
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.4), 0 8px 24px rgba(0,0,0,0.3) !important;
  transform: scale(1.02);
}

.choice-btn.correct {
  background: #DCFCE7 !important;
  border-color: #10B981 !important;
  color: #065F46 !important;
  box-shadow: 0 6px 0 #059669 !important;
}

.choice-btn.wrong {
  background: #FEE2E2 !important;
  border-color: #EF4444 !important;
  color: #991B1B !important;
  box-shadow: 0 6px 0 #DC2626 !important;
}

/* กล่องยืนยันขนาดกะทัดรัด (Compact Inline Confirmation) ตรงข้อที่เลือก */
.choice-confirm-inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(245, 158, 11, 0.4);
  gap: 8px;
  animation: fadeIn 0.18s ease-out;
  flex-wrap: wrap;
}

.timer-badge-10s {
  background: #EF4444;
  color: white;
  padding: 3px 10px;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.85rem !important;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  animation: pulseTimer 1s infinite alternate;
}

@keyframes pulseTimer {
  from { transform: scale(1); opacity: 1; }
  to { transform: scale(1.06); opacity: 0.85; }
}

.btn-mini-sure {
  background: var(--accent-green);
  color: white;
  border: none;
  padding: 6px 16px;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.92rem !important;
  cursor: pointer;
  box-shadow: 0 3px 0 #059669;
  transition: all 0.15s ease;
}

.btn-mini-sure:active { transform: translateY(2px); box-shadow: 0 1px 0 #059669; }

.btn-mini-unsure {
  background: #475569;
  color: white;
  border: none;
  padding: 6px 14px;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.85rem !important;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-mini-unsure:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: #94A3B8;
}

/* ================= 7.2 แถบเครื่องมือควบคุมการเล่นเกม ================= */
.game-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
  width: 100%;
}

@media (min-width: 768px) {
  .game-toolbar {
    gap: 20px;
    margin-top: 32px;
  }
}

.btn-tool {
  flex: 1;
  padding: calc(14px * var(--user-card-scale)) calc(16px * var(--user-card-scale));
  border-radius: var(--radius-md);
  font-size: calc(1.05rem * var(--user-font-scale));
  font-weight: 800;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

@media (min-width: 768px) {
  .btn-tool {
    padding: calc(18px * var(--user-card-scale)) calc(24px * var(--user-card-scale));
    font-size: calc(1.35rem * var(--user-font-scale));
    border-radius: 16px;
  }
}

.btn-tool-reveal {
  background: #F59E0B;
  color: #0F172A;
  box-shadow: 0 4px 0 #D97706;
}

.btn-tool-skip {
  background: #475569;
  color: white;
  box-shadow: 0 4px 0 #334155;
}

.btn-tool-next {
  flex: 1.4;
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 0 var(--primary-dark);
}

.btn-tool:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
  transform: none !important;
}

.btn-tool:not(:disabled):active { transform: translateY(2px); }

#stage-feedback {
  display: none;
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  padding: calc(16px * var(--user-card-scale)) calc(20px * var(--user-card-scale));
  margin-top: 20px;
  backdrop-filter: blur(12px);
  font-size: calc(1.05rem * var(--user-font-scale));
  font-weight: 700;
}

#stage-feedback:empty { display: none !important; }

@media (min-width: 768px) {
  #stage-feedback {
    padding: calc(22px * var(--user-card-scale)) calc(28px * var(--user-card-scale));
    font-size: calc(1.3rem * var(--user-font-scale));
    border-radius: var(--radius-lg);
  }
}

/* ================= 8. โหมดจับคู่ ================= */
.match-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(14px * var(--user-card-scale));
  width: 100%;
  margin-top: 10px;
}

@media (min-width: 768px) {
  .match-stage {
    gap: calc(32px * var(--user-card-scale));
    margin-top: 18px;
  }
}

.match-tile {
  padding: calc(14px * var(--user-card-scale)) calc(12px * var(--user-card-scale));
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: calc(0.95rem * var(--user-font-scale));
  text-align: center;
  cursor: pointer;
  margin-bottom: calc(12px * var(--user-card-scale));
  min-height: calc(58px * var(--user-card-scale));
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  line-height: 1.4;
  transition: all 0.15s ease;
}

@media (min-width: 768px) {
  .match-tile {
    min-height: calc(84px * var(--user-card-scale));
    padding: calc(20px * var(--user-card-scale)) calc(24px * var(--user-card-scale));
    font-size: calc(1.3rem * var(--user-font-scale));
    border-radius: 18px;
    margin-bottom: calc(18px * var(--user-card-scale));
  }
}

.match-tile:active { transform: scale(0.97); }

#match-col-left .match-tile {
  background: linear-gradient(135deg, #FFFFFF 0%, #EEF2FF 100%);
  border: 2px solid #818CF8;
  color: #1E1B4B;
  box-shadow: 0 4px 0 #6366F1, 0 8px 18px rgba(0, 0, 0, 0.22);
}

@media (min-width: 768px) {
  #match-col-left .match-tile {
    box-shadow: 0 6px 0 #6366F1, 0 12px 24px rgba(0, 0, 0, 0.25);
  }
  #match-col-left .match-tile:hover {
    border-color: #4F46E5;
    transform: translateY(-2px);
  }
}

.tile-badge-num {
  background: #4F46E5;
  color: white;
  font-size: 0.85em;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 8px;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .tile-badge-num {
    padding: 6px 14px;
    border-radius: 10px;
  }
}

#match-col-right .match-tile {
  background: linear-gradient(135deg, #FFFFFF 0%, #ECFDF5 100%);
  border: 2px solid #34D399;
  color: #064E3B;
  box-shadow: 0 4px 0 #10B981, 0 8px 18px rgba(0, 0, 0, 0.22);
}

@media (min-width: 768px) {
  #match-col-right .match-tile {
    box-shadow: 0 6px 0 #10B981, 0 12px 24px rgba(0, 0, 0, 0.25);
  }
  #match-col-right .match-tile:hover {
    border-color: #059669;
    transform: translateY(-2px);
  }
}

.tile-badge-alpha {
  background: #059669;
  color: white;
  font-size: 0.85em;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 8px;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .tile-badge-alpha {
    padding: 6px 14px;
    border-radius: 10px;
  }
}

.match-tile.selected {
  border-color: #F59E0B !important;
  box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.45), 0 8px 24px rgba(0, 0, 0, 0.3) !important;
  transform: scale(1.03) !important;
}

.match-tile.done {
  opacity: 0.22;
  filter: grayscale(1);
  pointer-events: none;
  transform: none !important;
}

/* ================= 9. โหมดเปิดแผ่นป้าย ================= */
.memory-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(12px * var(--user-card-scale));
  width: 100%;
  margin-top: 14px;
}

@media (min-width: 768px) {
  .memory-matrix {
    grid-template-columns: repeat(4, 1fr);
    gap: calc(22px * var(--user-card-scale));
    margin-top: 24px;
  }
}

.matrix-card {
  height: calc(95px * var(--user-card-scale));
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
}

@media (min-width: 768px) {
  .matrix-card { height: calc(155px * var(--user-card-scale)); }
}

.matrix-card:active { transform: scale(0.96); }
.matrix-card.flipped { transform: rotateY(180deg); }

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  font-weight: 800;
  text-align: center;
  backface-visibility: hidden;
  box-shadow: 0 6px 16px rgba(0,0,0,0.3);
}

.card-front {
  background: linear-gradient(135deg, #6366F1, #4338CA);
  color: white;
  font-size: calc(1.8rem * var(--user-card-scale));
  border: 2px solid rgba(255, 255, 255, 0.25);
}

@media (min-width: 768px) {
  .card-front { font-size: calc(3.2rem * var(--user-card-scale)); border-radius: 20px; }
}

.card-back {
  background: white;
  border: 3px solid #6366F1;
  color: #4338CA;
  font-size: calc(0.95rem * var(--user-font-scale));
  transform: rotateY(180deg);
}

@media (min-width: 768px) {
  .card-back {
    font-size: calc(1.25rem * var(--user-font-scale));
    padding: 16px;
    border-radius: 20px;
  }
}

.matrix-card.matched {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

/* ================= 10. ปุ่มแอ็กชันใหญ่ ================= */
.btn-action-next {
  width: 100%;
  background: var(--primary);
  color: white;
  border: none;
  padding: calc(16px * var(--user-card-scale));
  font-size: calc(1.1rem * var(--user-font-scale));
  font-weight: 800;
  border-radius: var(--radius-md);
  margin-top: 22px;
  cursor: pointer;
  box-shadow: 0 5px 0 var(--primary-dark);
  transition: all 0.15s ease;
}

@media (min-width: 768px) {
  .btn-action-next {
    padding: calc(22px * var(--user-card-scale));
    font-size: calc(1.4rem * var(--user-font-scale));
    border-radius: 20px;
    box-shadow: 0 6px 0 var(--primary-dark);
    margin-top: 32px;
  }
  .btn-action-next:hover {
    background: #4338CA;
    transform: translateY(-2px);
  }
}

.btn-action-next:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--primary-dark);
}

/* ================= 11. หน้าสถิติ ================= */
#view-stats {
  background: white !important;
  color: var(--text-dark) !important;
  border-radius: var(--radius-xl) !important;
  padding: 24px 20px !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3) !important;
}

@media (min-width: 768px) {
  #view-stats {
    padding: 36px 32px !important;
    max-width: 900px !important;
  }
}

#view-stats .stage-nav {
  border-bottom: 1px solid #E2E8F0;
  color: var(--text-dark);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 16px;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 24px;
  }
}

.stat-card {
  background: #F8FAFC;
  border: 2px solid #E2E8F0;
  border-radius: var(--radius-md);
  padding: 18px 14px;
  text-align: center;
}

@media (min-width: 768px) {
  .stat-card { padding: 26px 18px; border-radius: 18px; }
}

.stat-icon { font-size: 2rem; margin-bottom: 6px; }
@media (min-width: 768px) { .stat-icon { font-size: 2.8rem; margin-bottom: 10px; } }

.stat-val {
  font-size: calc(1.6rem * var(--user-font-scale));
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 2px;
}
@media (min-width: 768px) { .stat-val { font-size: calc(2.4rem * var(--user-font-scale)); } }

.stat-label {
  font-size: calc(0.82rem * var(--user-font-scale));
  font-weight: 700;
  color: var(--text-muted);
}
@media (min-width: 768px) { .stat-label { font-size: calc(1rem * var(--user-font-scale)); } }

/* ================= 12. หน้าตั้งค่าแบบ Dual-Mode ================= */
#view-settings {
  display: none;
  width: 100%;
}

#view-settings:not(.modal-mode) {
  background: transparent !important;
  box-shadow: none !important;
  border: none !important;
  padding: 0 !important;
  max-width: 100% !important;
}

#view-settings:not(.modal-mode) .stage-nav {
  border-bottom: 1px solid var(--stage-nav-border);
  color: var(--text-stage-head);
}

#view-settings:not(.modal-mode) #btn-close-settings-modal {
  display: none !important;
}

#view-settings.modal-mode {
  position: fixed !important;
  inset: 0 !important;
  z-index: 1200 !important;
  background: rgba(15, 23, 42, 0.78) !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 16px !important;
  animation: fadeIn 0.2s ease-out;
}

#view-settings.modal-mode .settings-content-wrapper {
  background: var(--bg-dark);
  border: 1px solid var(--stage-nav-border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 900px;
  max-height: 86vh;
  max-height: 86dvh;
  overflow-y: auto;
  padding: 22px 20px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.55);
  animation: modalPop 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (min-width: 768px) {
  #view-settings.modal-mode .settings-content-wrapper {
    padding: 28px 30px;
    border-radius: 26px;
  }
}

@keyframes modalPop {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

#view-settings.modal-mode .stage-nav {
  display: none !important;
}

#view-settings.modal-mode #btn-close-settings-modal {
  display: inline-flex !important;
}

.settings-modal-header {
  display: none;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--stage-nav-border);
}

#view-settings.modal-mode .settings-modal-header {
  display: flex !important;
}

.settings-modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-stage-head);
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (min-width: 768px) {
  .settings-modal-title { font-size: 1.6rem; }
}

.btn-close-settings-modal {
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid var(--stage-nav-border);
  color: var(--text-stage-head);
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-close-settings-modal:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.btn-close-settings-modal:active { transform: scale(0.96); }

/* 2 คอลัมน์ภายในหน้าตั้งค่า */
.settings-2col-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  width: 100%;
}

@media (min-width: 768px) {
  .settings-2col-grid {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
    align-items: start;
  }
}

.settings-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 768px) {
  .settings-column { gap: 20px; }
}

/* ล็อคขนาดในหน้าต่างตั้งค่าให้คงที่เสมอ ไม่ขยายตามสไลเดอร์ */
.setting-control-card,
.setting-row {
  background: rgba(255, 255, 255, 0.98);
  border: 2px solid #E2E8F0;
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  color: var(--text-dark);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.setting-control-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: background 0.15s ease;
}

.setting-row:active { background: #EEF2FF; }

.setting-title {
  font-size: 1.05rem !important;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 2px;
}

@media (min-width: 768px) {
  .setting-title { font-size: 1.2rem !important; }
}

.setting-desc {
  font-size: 0.84rem !important;
  color: var(--text-muted);
  line-height: 1.4;
}

.setting-slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.setting-badge-percent {
  background: var(--primary);
  color: white;
  padding: 4px 14px;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.95rem !important;
  letter-spacing: 0.5px;
}

/* สไลเดอร์ปรับค่าละเอียดทีละ 1% */
.range-slider-input {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: #CBD5E1;
  outline: none;
  margin: 12px 0 6px;
  cursor: pointer;
}

.range-slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  border: 2px solid white;
  transition: transform 0.1s;
}

.range-slider-input::-webkit-slider-thumb:hover { transform: scale(1.15); }

.range-slider-input::-moz-range-thumb {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  border: 2px solid white;
}

/* ตารางเลือกธีมสี 14 แบบ */
.theme-chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(115px, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.theme-chip {
  padding: 10px 8px;
  border-radius: 12px;
  border: 2px solid #CBD5E1;
  text-align: center;
  font-size: 0.85rem !important;
  font-weight: 800;
  cursor: pointer;
  color: white;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.theme-chip:hover { transform: translateY(-2px); }
.theme-chip.active {
  border-color: #F59E0B !important;
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.45);
}

.chip-system    { background: linear-gradient(135deg, #334155, #64748B); }
.chip-indigo    { background: linear-gradient(135deg, #0F172A, #1E1B4B); }
.chip-midnight  { background: linear-gradient(135deg, #090A0F, #1B1E2B); }
.chip-emerald   { background: linear-gradient(135deg, #062016, #114B36); }
.chip-royal     { background: linear-gradient(135deg, #1C0A35, #4C1D95); }
.chip-golden    { background: linear-gradient(135deg, #1E1705, #4D3B0D); }
.chip-ocean     { background: linear-gradient(135deg, #05192D, #0F457A); }
.chip-crimson   { background: linear-gradient(135deg, #2A080C, #68101A); }
.chip-cyberpunk { background: linear-gradient(135deg, #0A0A16, #290838); }
.chip-slate     { background: linear-gradient(135deg, #1E293B, #334155); }
.chip-light     { background: linear-gradient(135deg, #E2E8F0, #F8FAFC); color: #0F172A; }
.chip-parchment { background: linear-gradient(135deg, #E5DAC1, #FAF7EE); color: #451A03; }
.chip-rose      { background: linear-gradient(135deg, #FECDD3, #FFF1F2); color: #881337; }
.chip-frost     { background: linear-gradient(135deg, #BBF7D0, #F0FDF4); color: #064E3B; }

/* กล่องเลือกฟอนต์ 20 แบบ */
.font-select-dropdown {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 2px solid #CBD5E1;
  background: white;
  font-size: 1rem !important;
  font-weight: 700;
  color: var(--text-dark);
  cursor: pointer;
  outline: none;
  margin-top: 6px;
}

.font-select-dropdown:focus { border-color: var(--primary); }

/* iOS Switch Toggle */
.switch-toggle {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 30px;
  flex-shrink: 0;
}
@media (min-width: 768px) { .switch-toggle { width: 58px; height: 34px; } }

.switch-toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #CBD5E1;
  transition: .3s;
  border-radius: 34px;
}
.toggle-slider:before {
  position: absolute;
  content: "";
  height: 24px;
  width: 24px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
@media (min-width: 768px) { .toggle-slider:before { height: 28px; width: 28px; } }

input:checked + .toggle-slider { background-color: var(--accent-green); }
input:checked + .toggle-slider:before { transform: translateX(20px); }
@media (min-width: 768px) { input:checked + .toggle-slider:before { transform: translateX(24px); } }

/* ================= 13. แถบนำทางล่างสุด (ไอคอนและชื่อปุ่มชิดกันกระชับสวยงาม + ลอยพ้นขีดโฮม) ================= */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--nav-border) !important;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding-bottom: max(10px, env(safe-area-inset-bottom, 10px));
  height: calc(62px + max(10px, env(safe-area-inset-bottom, 10px))) !important;
  transition: background 0.3s ease, border-color 0.3s ease;
}

@media (min-width: 768px) {
  .bottom-nav {
    bottom: max(18px, env(safe-area-inset-bottom, 18px)) !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    height: 68px !important;
    padding: 0 32px !important;
    padding-bottom: 0 !important;
    max-width: 780px;
    border-radius: 50px !important;
    border: 1px solid var(--nav-border) !important;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28) !important;
  }
}

.bnav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--nav-text-muted) !important;
  padding: 4px 0 !important;
  gap: 2px !important;
  line-height: 1 !important;
  cursor: pointer;
  transition: all 0.15s ease;
  outline: none;
}

.bnav-btn:active { transform: scale(0.92); }

.bnav-icon {
  font-size: 1.35rem !important;
  margin-bottom: 0 !important;
  line-height: 1 !important;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@media (min-width: 768px) { .bnav-icon { font-size: 1.55rem !important; } }

.bnav-text {
  font-size: 0.76rem !important;
  font-weight: 700;
  letter-spacing: -0.2px;
  margin-top: 0 !important;
  line-height: 1 !important;
}
@media (min-width: 768px) { .bnav-text { font-size: 0.88rem !important; } }

.bnav-btn.active { color: var(--nav-text) !important; }
.bnav-btn.active .bnav-icon { transform: translateY(-2px) scale(1.15); }
.bnav-btn.active .bnav-text { color: var(--accent-gold) !important; }

/* ================= 14. QUICK SWITCHER MODAL ================= */
.quick-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: flex-end;
  justify-content: center;
}
.quick-modal-overlay.active { display: flex; }
@media (min-width: 768px) { .quick-modal-overlay { align-items: center; } }

.quick-sheet {
  background: white;
  width: 100%;
  max-width: 520px;
  border-radius: 24px 24px 0 0;
  padding: 24px 20px calc(26px + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -10px 30px rgba(0,0,0,0.3);
  color: var(--text-dark);
}
@media (min-width: 768px) {
  .quick-sheet {
    max-width: 620px;
    border-radius: 26px;
    padding: 30px 28px;
    box-shadow: 0 20px 45px rgba(0,0,0,0.45);
  }
}

.quick-sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.quick-sheet-header h3 { font-size: 1.15rem; font-weight: 800; color: var(--text-dark); }
@media (min-width: 768px) { .quick-sheet-header h3 { font-size: 1.4rem; } }

.btn-close-sheet {
  background: #F1F5F9;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.1rem;
  color: #64748B;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (min-width: 768px) { .quick-grid { gap: 18px; } }

.quick-item {
  background: #F8FAFC;
  border: 2px solid #E2E8F0;
  border-radius: var(--radius-md);
  padding: 16px 8px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s ease;
}
@media (min-width: 768px) { .quick-item { padding: 22px 12px 18px; border-radius: 18px; } }

.quick-item:active {
  transform: scale(0.94);
  border-color: var(--primary);
  background: #EEF2FF;
}

.quick-icon { font-size: 2rem; margin-bottom: 6px; }
@media (min-width: 768px) { .quick-icon { font-size: 2.8rem; margin-bottom: 10px; } }

.quick-name { font-size: 0.85rem; font-weight: 800; color: var(--text-dark); }
@media (min-width: 768px) { .quick-name { font-size: 1rem; } }