/* ══════════════════════════════════════════════════════════
   漢字源流 · Design System v3
   Modern Digital Museum & Glassmorphism
   ══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Outfit:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg:            #0A0A0A;
  --surface:       rgba(255, 255, 255, 0.03);
  --surface-2:     rgba(255, 255, 255, 0.06);
  --surface-3:     rgba(255, 255, 255, 0.1);
  --bg-primary: #0A0A0A;
  --bg-secondary: rgba(20, 20, 20, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.05);
  --border-focus: rgba(255, 255, 255, 0.15);
  --text-primary: #F8F9FA;
  --text-secondary: #ADB5BD;
  --ink:           #F8F9FA;
  --ink-2:         #E9ECEF;
  --muted:         #ADB5BD;
  --line:          rgba(255, 255, 255, 0.08);
  --line-strong:   rgba(255, 255, 255, 0.15);
  --hover:         rgba(255, 255, 255, 0.05);
  --accent:        #4FA89B; /* 翠玉色 Tranquil Jade */
  --accent-2:      #75C5B1;
  --accent-soft:   rgba(79, 168, 155, 0.15);
  --accent-glow:   rgba(79, 168, 155, 0.4);
  --green:         #10B981;
  --green-soft:    rgba(16, 185, 129, 0.15);
  --red:           #EF4444;
  --red-soft:      rgba(239, 68, 68, 0.15);
  --shadow-xs:     0 2px 8px rgba(0,0,0,0.4);
  --shadow-sm:     0 4px 16px rgba(0,0,0,0.5);
  --shadow-md:     0 12px 32px rgba(0,0,0,0.6);
  --shadow-lg:     0 24px 64px rgba(0,0,0,0.8);
  --shadow-glow:   0 0 24px var(--accent-glow);
  --r-sm:   8px;
  --r-md:   16px;
  --r-lg:   24px;
  --r-xl:   32px;
  --ease:   cubic-bezier(0.16,1,0.3,1);
  --ease-elastic: cubic-bezier(0.34, 1.56, 0.64, 1);
  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-sans:  'Outfit', 'Inter', system-ui, -apple-system, sans-serif;
  color-scheme: dark;
}

/* ── Reset ─────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(245, 158, 11, 0.04), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.03), transparent 25%);
  background-attachment: fixed;
  color:var(--ink);
  min-height:100vh;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Layout ─────────────────────────────────────────────── */
.app{
  width:min(1200px,calc(100vw - 40px));
  margin:0 auto;
  padding:0 0 100px;
}

/* ── Navbar ─────────────────────────────────────────────── */
.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:20px 0;
  margin-bottom:60px;
  border-bottom:1px solid var(--line);
  position: relative;
  z-index: 100;
}
.navbar-brand{
  display:flex;align-items:center;gap:12px;text-decoration:none;
  transition: transform 0.3s var(--ease-elastic);
}
.navbar-brand:hover {
  transform: scale(1.05);
}
.brand-icon{
  width:42px;height:42px;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent-2) 100%);
  border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;
  font-family: var(--font-serif);
  font-size:22px;color:#000;font-weight:700;
  box-shadow:var(--shadow-glow);
  flex-shrink:0;
}
.brand-text{
  font-size:20px;font-weight:600;color:var(--ink);
  letter-spacing:1px;
}
.navbar-nav{display:flex;gap:12px;align-items:center;}
.nav-link{
  font-size:14px;font-weight:500;
  color:var(--muted);text-decoration:none;
  padding:8px 16px;border-radius:20px;
  transition:all 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}
.nav-link::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--surface-3);
  border-radius: 20px;
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  z-index: -1;
}
.nav-link:hover{color:var(--ink);}
.nav-link:hover::before{opacity: 1;}
.nav-link.active{
  color:var(--accent);
}
.nav-link.active::after {
  content: '';
  position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%);
  width: 16px; height: 3px; border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.btn-share {
  height: 36px;
  padding: 0 16px;
  font-size: 13px;
  border-radius: 20px;
  margin-left: 12px;
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s var(--ease);
  font-weight: 500;
}
.btn-share:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.btn-share:active {
  transform: translateY(0);
}
.btn-share.success {
  border-color: var(--green) !important;
  color: var(--green) !important;
  background: var(--green-soft) !important;
  box-shadow: 0 0 16px rgba(16,185,129,0.3);
}

/* ── Page Header ─────────────────────────────────────────── */
.page-header{margin-bottom:60px; text-align: center; animation: fadeDown 0.8s var(--ease) both;}
.page-title{
  font-size:clamp(32px,5vw,56px);
  font-weight:700;color:var(--ink);
  letter-spacing:-0.02em;line-height:1.2;
  margin-bottom:16px;
  background: linear-gradient(to right, #FFF, #A3A3A3);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-subtitle{
  font-size:16px;
  color:var(--muted);max-width:600px;line-height:1.6;
  margin: 0 auto;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn{
  font-family:var(--font-sans);font-size:14px;font-weight:600;
  height:48px;padding:0 24px;border-radius:var(--r-md);
  border:1px solid var(--line-strong);
  background:var(--surface-2);color:var(--ink);
  cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  transition:all 0.3s var(--ease-elastic);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-decoration:none;white-space:nowrap;
}
.btn:hover{
  border-color:var(--ink);
  background: var(--surface-3);
  transform:translateY(-3px);
  box-shadow:var(--shadow-sm);
}
.btn:active{transform:translateY(-1px);}
.btn-primary{
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  color:#000;border:none;
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
}
.btn-primary:hover{
  background:linear-gradient(135deg, var(--accent-2), #FDE68A);
  color:#000;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.5);
}
.btn-accent{
  background:rgba(245,158,11,0.15);
  color:var(--accent);
  border: 1px solid rgba(245,158,11,0.3);
}
.btn-accent:hover{
  background:rgba(245,158,11,0.25);
  border-color: var(--accent);
  color:var(--accent-2);
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.2);
}
.btn-sm{height:36px;padding:0 16px;font-size:13px;border-radius:var(--r-sm);}
.btn-ghost{background:transparent;border-color:transparent;box-shadow:none;color:var(--muted);}
.btn-ghost:hover{background:var(--surface-2);color:var(--ink); transform:none;}

/* ── Hero Search ────────────────────────────────────────── */
.search-box{
  margin: 0 auto 60px;
  max-width: 800px;
  transition: all 0.5s var(--ease);
  position: relative;
  z-index: 10;
  animation: scaleUp 0.8s var(--ease) both 0.2s;
}
.search-input-row{
  position: relative;
  display:flex;
  align-items: center;
  border-radius:var(--r-lg);
  background: rgba(20, 20, 20, 0.6);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--line-strong);
  box-shadow: 0 16px 40px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
  padding: 8px;
  transition: all 0.3s var(--ease);
}
.search-input-row:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 20px 48px rgba(0,0,0,0.6), 0 0 32px var(--accent-glow);
  transform: translateY(-2px);
}
#searchInput{
  flex:1;
  font-family:var(--font-serif);
  font-size:22px;
  padding:16px 24px;
  background: transparent;
  border: none;
  color:var(--ink);
  outline:none;
}
#searchInput::placeholder{color:var(--muted); font-family: var(--font-sans); font-weight: 300; font-size: 18px;}
.search-hint{
  font-size:14px;color:var(--muted);
  margin-top:16px;text-align: center;
  opacity: 0.8;
}

/* ── Tier Tabs ──────────────────────────────────────────── */
.tier-tabs{
  display:flex;gap:12px;flex-wrap:wrap;
  margin-bottom:32px;
  background: rgba(0,0,0,0.3);
  padding: 8px;
  border-radius: 100px;
  border: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  width: max-content;
  max-width: 100%;
}
.tier-tab{
  font-family:var(--font-sans);font-size:14px;font-weight:500;
  padding:10px 20px;
  border-radius:100px;
  border:none;
  background:transparent;
  color:var(--muted);
  cursor:pointer;
  transition:all 0.3s var(--ease);
  display:flex;align-items:center;gap:8px;
  position: relative;
}
.tier-tab:hover{color:var(--ink); background: var(--surface-2);}
.tier-tab.active{
  background:var(--ink);color:#000;
  box-shadow: 0 4px 12px rgba(255,255,255,0.1);
}
.tier-tab .tier-count{
  font-size:12px;opacity:0.7;
  background: rgba(255,255,255,0.1);
  padding: 2px 8px;
  border-radius: 10px;
}
.tier-tab.active .tier-count {
  background: rgba(0,0,0,0.15);
  color: #000;
}

/* ── Controls Row ───────────────────────────────────────── */
.controls-row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:24px;
  flex-wrap:wrap;gap:16px;
  background: var(--surface);
  padding: 16px 24px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.controls-left{display:flex;align-items:center;gap:12px;}
.section-label{font-size:18px;font-weight:600;color:var(--ink);}
.batch-tag{
  font-size:13px;color:var(--accent);
  background:var(--accent-soft);
  padding:4px 12px;border-radius:12px;
  border: 1px solid rgba(245,158,11,0.2);
}
.controls-right{display:flex;gap:12px;align-items:center;}

/* ── Mode Switch (iOS Style Toggle) ─────────────────────── */
.mode-switch{
  display:flex;
  background:rgba(0,0,0,0.5);
  border:1px solid var(--line-strong);
  border-radius:100px;
  padding:4px;
  position: relative;
}
.mode-btn{
  font-size:14px;font-weight:600;
  padding:0 20px;height:36px;
  border-radius:100px;border:none;
  background:transparent;color:var(--muted);
  cursor:pointer;
  transition:all 0.4s var(--ease);
  display:flex;align-items:center;gap:6px;
  position: relative;
  z-index: 2;
}
.mode-btn:hover{color:var(--ink);}
.mode-btn.active{color:#000;}

/* Active toggle background trick */
.mode-switch::before {
  content: '';
  position: absolute;
  top: 4px; bottom: 4px; width: calc(50% - 4px);
  background: var(--ink);
  border-radius: 100px;
  transition: transform 0.4s var(--ease-elastic);
  z-index: 1;
}
.mode-switch:has(#testModeBtn.active)::before {
  transform: translateX(100%);
}

/* Fallback for browsers that don't support :has() */
.mode-switch-active-left::before { transform: translateX(0); }
.mode-switch-active-right::before { transform: translateX(100%); }

/* ── Idiom Grid ─────────────────────────────────────────── */
.idiom-grid{
  display:flex;flex-wrap:wrap;gap:12px;
  margin-bottom:48px;
}
.idiom-btn{
  font-family:var(--font-serif);
  font-size:18px;font-weight:600;
  padding:14px 24px;
  border-radius:var(--r-md);
  border:1px solid var(--line-strong);
  background:rgba(20,20,20,0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color:var(--ink-2);
  cursor:pointer;
  transition:all 0.3s var(--ease-elastic);
  box-shadow:var(--shadow-xs);
  letter-spacing:0.1em;
  position:relative;overflow:hidden;
}
.idiom-btn::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(circle at center, var(--accent-soft), transparent 70%);
  opacity:0;transition:opacity 0.4s var(--ease);
}
.idiom-btn:hover{
  border-color:var(--accent);
  transform:translateY(-4px) scale(1.02);
  box-shadow: 0 12px 24px rgba(0,0,0,0.4), 0 0 16px rgba(245,158,11,0.2);
  color:#FFF;
}
.idiom-btn:hover::before{opacity:1;}
.idiom-btn.active{
  background:linear-gradient(135deg, rgba(245,158,11,0.2), rgba(245,158,11,0.05));
  color:#FFF;
  border-color:var(--accent);
  box-shadow: 0 0 24px rgba(245,158,11,0.3);
  transform:translateY(-2px);
}
.idiom-btn.active::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px; background: var(--accent);
}

/* ── Preview Section ────────────────────────────────────── */
.preview-section{
  background:linear-gradient(180deg, rgba(30,30,30,0.8) 0%, rgba(15,15,15,0.9) 100%);
  border:1px solid var(--line-strong);
  border-radius:var(--r-xl);
  padding:40px;
  margin:0 0 48px;
  box-shadow:var(--shadow-lg), inset 0 1px 0 rgba(255,255,255,0.1);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  animation:fadeUp 0.6s var(--ease) both;
  position:relative;
  overflow:hidden;
}
.preview-section::before{
  content:'';
  position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
  opacity: 0.8;
}
.preview-header{
  display:flex;justify-content:space-between;align-items:flex-start;
  margin-bottom:36px;padding-bottom:24px;
  border-bottom:1px solid var(--line);
  gap:24px;flex-wrap:wrap;
}
.preview-header-left h3{
  font-size:22px;font-weight:600;color:#FFF;margin-bottom:8px;
  letter-spacing: 1px;
}
.preview-subtitle{
  font-size:14px;color:var(--muted);
}

/* ── Character Sequence ──────────────────────────────────── */
.char-sequence{
  display:flex;gap:36px;flex-wrap:wrap;align-items:flex-end;
  justify-content:center;
}
.seq-char{
  display:flex;flex-direction:column;align-items:center;
  gap:16px;min-width:80px;
  animation:charScaleUp 0.6s var(--ease-elastic) both;
}
.seq-char:nth-child(2) { animation-delay: 0.1s; }
.seq-char:nth-child(3) { animation-delay: 0.2s; }
.seq-char:nth-child(4) { animation-delay: 0.3s; }

.seq-char .ancient-img{
  height:96px;width:auto;max-width:96px;
  object-fit:contain;
  filter:drop-shadow(0 4px 12px rgba(245, 158, 11, 0.4)) invert(1) hue-rotate(180deg) brightness(1.2);
  transition:all 0.4s var(--ease-elastic);
  image-rendering:-webkit-optimize-contrast;
  image-rendering:crisp-edges;
}
.seq-char:hover .ancient-img{
  transform:scale(1.15) translateY(-8px);
  filter:drop-shadow(0 8px 24px rgba(245, 158, 11, 0.6)) invert(1) hue-rotate(180deg) brightness(1.5);
}
.seq-char .ancient-img-placeholder{
  height:96px;width:96px;
  display:flex;align-items:center;justify-content:center;
  border-radius:var(--r-md);
  background:var(--surface-2);
  border: 1px dashed var(--line-strong);
}
.seq-char .ancient-source{
  font-size:11px;color:var(--accent);
  text-align:center;max-width:90px;line-height:1.4;
  background:var(--accent-soft);padding:4px 10px;border-radius:12px;
  border: 1px solid rgba(245,158,11,0.2);
  letter-spacing: 0.5px;
}
.seq-char .modern-char{
  font-family: var(--font-serif);
  font-size:32px;font-weight:700;color:#FFF;
  border-top:1px solid var(--line-strong);
  padding-top:16px;width:100%;text-align:center;
  min-width:48px;
  transition:all 0.3s;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

/* ── Reveal ──────────────────────────────────────────────── */
.reveal-wrap{text-align:center;margin-top:40px;}
.reveal-btn{display:none;}
.blur-text{
  filter:blur(16px) opacity(0.3);
  pointer-events:none;user-select:none;
  transition:all 0.8s var(--ease);
}

/* ── Results Grid ───────────────────────────────────────── */
.results-grid{
  display:grid;grid-template-columns:1fr;gap:24px;
}
@media(min-width:840px){
  .results-grid{
    grid-template-columns:repeat(auto-fit,minmax(480px,1fr));
    align-items:start;
  }
}

/* ── Char Card ──────────────────────────────────────────── */
.char-card{
  background:rgba(20,20,20,0.7);
  border:1px solid var(--line-strong);
  border-radius:var(--r-xl);
  padding:32px;
  box-shadow:var(--shadow-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation:fadeUp 0.6s var(--ease) both;
  transition:all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}
.char-card::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(135deg, rgba(255,255,255,0.05), transparent 50%);
  border-radius: var(--r-xl);
}
.char-card:hover{
  box-shadow:var(--shadow-lg), 0 0 32px rgba(255,255,255,0.03);
  border-color:rgba(255,255,255,0.3);
  transform: translateY(-2px);
}
.card-header{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:24px;padding-bottom:16px;
  border-bottom:1px solid var(--line);gap:16px;
}
.card-char{
  font-family: var(--font-serif);
  font-size:56px;font-weight:700;color:#FFF;
  line-height:1;letter-spacing:-0.02em;
  text-shadow: 0 4px 16px rgba(0,0,0,0.5);
}
.card-controls{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.card-content{overflow-x:auto;border-radius:var(--r-md); padding-bottom: 8px;}
.card-content::-webkit-scrollbar{height:6px;}
.card-content::-webkit-scrollbar-track{background:rgba(0,0,0,0.3);border-radius:3px;}
.card-content::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:3px;}
.card-content::-webkit-scrollbar-thumb:hover{background:var(--muted);}

/* ── Evolution Table ─────────────────────────────────────── */
#yanbian_result{
  width:100%;border-collapse:separate;
  border-spacing:8px;min-width:max-content;
}
#yanbian_result td{
  padding:16px;text-align:center;vertical-align:top;
  border-radius:var(--r-md);font-size:14px;
  color:var(--ink-2);line-height:1.6;
}
.VariantListA,.VariantListB{
  background:rgba(0,0,0,0.4);
  border:1px solid var(--line) !important;
  transition:all 0.3s var(--ease-elastic);
  position: relative;
}
.VariantListA:hover,.VariantListB:hover{
  border-color:var(--accent) !important;
  transform:translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(245,158,11,0.2);
  background:rgba(245,158,11,0.05);
}
.charValue{
  max-width:64px;height:auto;margin:0 auto 12px;display:block;
  filter:invert(1) hue-rotate(180deg) brightness(1.2) drop-shadow(0 2px 8px rgba(0,0,0,0.5));
  transition: transform 0.3s;
  image-rendering:-webkit-optimize-contrast;
  image-rendering:crisp-edges;
}
.VariantListA:hover .charValue, .VariantListB:hover .charValue {
  transform: scale(1.1);
  filter:invert(1) hue-rotate(180deg) brightness(1.5) drop-shadow(0 4px 12px rgba(245,158,11,0.4));
}
.Information,.RemindMessage,.ZiList,#StartOrder,
#yanbian_result tr:has(td[colspan="10"]),
#yanbian_result td[colspan="10"]{display:none !important;}
#yanbian_result br{display:block;margin-top:6px;}
#yanbian_result td:empty{display:none;}

/* ── Loading & Error ─────────────────────────────────────── */
.loading-indicator{
  display:flex;align-items:center;gap:10px;
  font-size:14px;color:var(--accent);
}
.spinner{
  width:16px;height:16px;
  border:2px solid rgba(245,158,11,0.2);
  border-top-color:var(--accent);
  border-radius:50%;
  animation:spin 0.8s linear infinite;flex-shrink:0;
}
.spinner-sm{width:14px;height:14px;border-width:2px;}
@keyframes spin{to{transform:rotate(360deg);}}
.error-tag{
  display:none;
  font-size:13px;
  color:var(--red);background:var(--red-soft);
  padding:6px 12px;border-radius:var(--r-sm);
  border:1px solid rgba(239,68,68,0.3);
}

/* ── Notice Banner ──────────────────────────────────────── */
.notice-banner{
  display:flex;align-items:flex-start;gap:12px;
  padding:16px 20px;
  background:linear-gradient(to right, rgba(245,158,11,0.1), rgba(245,158,11,0.05));
  border:1px solid rgba(245,158,11,0.2);
  border-left: 4px solid var(--accent);
  border-radius:var(--r-md);
  margin-bottom:36px;
  font-size:14px;
  color:var(--ink);line-height:1.6;
  animation:fadeUp 0.6s var(--ease) both;
  backdrop-filter: blur(8px);
}
.notice-text{flex:1;}
.notice-close{
  background:none;border:none;font-size:20px;
  color:var(--muted);cursor:pointer;padding:0 4px;
  transition:all 0.2s;flex-shrink:0;
}
.notice-close:hover{color:#FFF; transform:scale(1.1);}

/* ── Footer ─────────────────────────────────────────────── */
.site-footer{
  margin-top:100px;padding:32px 0;
  border-top:1px solid var(--line);
  font-size:14px;
  color:var(--muted);text-align:center;line-height:1.8;
}
.site-footer a{color:var(--muted);text-decoration:none;border-bottom: 1px solid var(--line-strong);transition:all 0.2s;}
.site-footer a:hover{color:#FFF; border-bottom-color: #FFF;}

/* ── Animations ─────────────────────────────────────────── */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(20px);}
  to{opacity:1;transform:translateY(0);}
}
@keyframes fadeDown{
  from{opacity:0;transform:translateY(-20px);}
  to{opacity:1;transform:translateY(0);}
}
@keyframes scaleUp{
  from{opacity:0;transform:scale(0.95);}
  to{opacity:1;transform:scale(1);}
}
@keyframes charScaleUp{
  from{opacity:0;transform:translateY(16px) scale(0.8);}
  to{opacity:1;transform:translateY(0) scale(1);}
}

/* ── Responsive ─────────────────────────────────────────── */
@media(max-width:768px){
  .app{width:calc(100vw - 32px);}
  .navbar{flex-direction:column;align-items:flex-start;gap:20px;margin-bottom:48px; padding-bottom: 24px;}
  .tier-tabs{gap:8px; padding: 6px; border-radius: 20px; width: 100%; justify-content: center;}
  .tier-tab{font-size:13px;padding:8px 14px;}
  .controls-row{flex-direction:column;align-items:stretch;}
  .controls-right{flex-wrap:wrap;}
  .mode-switch{width: 100%;}
  .mode-btn{flex:1;justify-content:center;}
  .preview-section{padding:24px 20px;}
  .preview-header{flex-direction:column; gap:16px;}
  .char-sequence{justify-content:center;gap:24px;}
  .char-card{padding:24px 20px;}
  .search-input-row{flex-direction:column; background: transparent; box-shadow: none; border: none; padding: 0; gap: 12px;}
  .search-input-row:focus-within {box-shadow: none; transform: none;}
  #searchInput{
    border-radius: var(--r-md);
    background: rgba(20,20,20,0.8);
    border: 1px solid var(--line-strong);
    padding: 16px;
    box-shadow: var(--shadow-sm);
  }
  .search-input-row .btn{width:100%; height: 54px; font-size: 16px;}
  .page-title{font-size:28px;}
}