/* =============================================
   AUTUMN FALLCAL — Edinburgh Autumn Calculator
   Light: warm parchment + amber + burnt sienna
   Dark:  deep charcoal + ember glow
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=DM+Mono:wght@300;400;500&family=Kaisei+Decol:wght@400;700&display=swap');

/* ===== LIGHT THEME — Edinburgh Autumn Day ===== */
:root {
  --bg:          #faf4ed;   /* warm parchment */
  --bg2:         #f5ece0;
  --bg3:         #ede0cc;
  --surface:     #fffcf7;
  --surface2:    #fdf5e8;
  --surface3:    #f8e8cc;
  --border:      #ddb97a;
  --border2:     #c8904a;
  --text:        #1e1208;
  --text2:       #6b3a10;
  --muted:       #b08040;
  --accent:      #c05818;   /* burnt sienna */
  --accent2:     #e07828;   /* amber */
  --accent3:     #f0a850;   /* golden */
  --accent-glow: rgba(192,88,24,0.2);
  --pink-light:  #f8d8a0;
  --mono:        'DM Mono', monospace;
  --jp:          'Noto Sans JP', sans-serif;
  --display:     'Kaisei Decol', serif;
  --radius:      14px;
  --radius-lg:   22px;
  --radius-xl:   32px;
  --radius-pill: 100px;

  --card-shadow:    4px 8px 0 #c8904a, 0 16px 40px rgba(192,88,24,0.18);
  --card-shadow-hv: 6px 12px 0 #c8904a, 0 24px 50px rgba(192,88,24,0.25);
  --btn-shadow:     0 6px 0 #8b3a08, 0 8px 20px rgba(140,58,8,0.35);
  --btn-shadow-hv:  0 8px 0 #8b3a08, 0 12px 28px rgba(140,58,8,0.42);
  --btn-shadow-act: 0 2px 0 #8b3a08, 0 3px 10px rgba(140,58,8,0.25);
  --op-shadow:      0 4px 0 #ddb97a, 0 6px 12px rgba(192,88,24,0.14);
  --op-shadow-act:  0 4px 0 #8b3a08, 0 6px 16px rgba(140,58,8,0.32);
  --nav-bg:         rgba(250,244,237,0.9);
  --trans: all 0.22s cubic-bezier(0.34,1.56,0.64,1);
  --trans-fast: all 0.15s ease;
}

/* ===== DARK THEME — Edinburgh Autumn Night ===== */
[data-theme="dark"] {
  --bg:          #0e0a06;   /* deep Edinburgh night */
  --bg2:         #161008;
  --bg3:         #201508;
  --surface:     #1a1008;
  --surface2:    #241808;
  --surface3:    #2e2010;
  --border:      rgba(200,144,74,0.2);
  --border2:     rgba(200,144,74,0.38);
  --text:        #faecd8;
  --text2:       #e8b870;
  --muted:       #806030;
  --accent:      #e87830;   /* ember orange */
  --accent2:     #f0a040;   /* warm amber */
  --accent3:     #c05010;
  --accent-glow: rgba(232,120,48,0.28);
  --pink-light:  #2a1808;
  --card-shadow:    4px 8px 0 #3a2008, 0 16px 40px rgba(0,0,0,0.55);
  --card-shadow-hv: 6px 12px 0 #3a2008, 0 24px 50px rgba(0,0,0,0.65);
  --btn-shadow:     0 6px 0 #5a2808, 0 8px 20px rgba(0,0,0,0.55);
  --btn-shadow-hv:  0 8px 0 #5a2808, 0 12px 28px rgba(0,0,0,0.65);
  --btn-shadow-act: 0 2px 0 #5a2808, 0 3px 10px rgba(0,0,0,0.45);
  --op-shadow:      0 4px 0 #3a2008, 0 6px 12px rgba(0,0,0,0.4);
  --op-shadow-act:  0 4px 0 #5a2808, 0 6px 16px rgba(0,0,0,0.55);
  --nav-bg:         rgba(14,10,6,0.94);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--jp);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
}

/* Edinburgh misty autumn texture */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 65% 45% at 15% 15%, rgba(210,140,60,0.13) 0%, transparent 60%),
    radial-gradient(ellipse 55% 55% at 85% 80%, rgba(160,80,20,0.09) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 50% 50%, rgba(240,180,80,0.05) 0%, transparent 70%);
}

/* Dot grid */
body::after {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image: radial-gradient(var(--border) 1.2px, transparent 1.2px);
  background-size: 28px 28px;
  opacity: 0.4;
}

/* ===== SAKURA PETALS ===== */
.sakura-layer { position: fixed; inset: 0; pointer-events: none; z-index: 1; overflow: hidden; }
.petal { position: absolute; animation: petalFall linear infinite; opacity: 0; font-size: 14px; }
@keyframes petalFall {
  0%   { transform: translateY(-30px) rotate(0deg) translateX(0); opacity: 0.65; }
  50%  { transform: translateY(50vh) rotate(180deg) translateX(30px); }
  100% { transform: translateY(110vh) rotate(360deg) translateX(-20px); opacity: 0; }
}

/* ===== NAVBAR ===== */
.main-nav {
  position: sticky; top: 0; z-index: 200;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
  transition: background 0.35s;
}
.nav-container {
  max-width: 1320px; margin: 0 auto; padding: 0 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.brand-kana {
  font-family: var(--display);
  font-size: 1.55rem; font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
  text-shadow: 2px 3px 0 var(--accent3);
  transition: var(--trans);
}
.brand-sep { color: var(--border2); font-size: 1.2rem; }
.brand-latin { font-family: var(--display); font-size: 1.1rem; color: var(--text2); font-weight: 400; }
.brand-tag {
  font-size: 0.68rem; color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  display: none;
}
@media (min-width: 600px) { .brand-tag { display: inline; } }

.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn-theme {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1.5px solid var(--border2);
  background: var(--surface);
  color: var(--muted); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  box-shadow: 0 3px 0 var(--border), 0 4px 10px rgba(192,88,24,0.1);
  transition: var(--trans);
}
.btn-theme:hover { color: var(--accent); border-color: var(--accent); transform: rotate(15deg) translateY(-2px); box-shadow: 0 5px 0 var(--border2), 0 6px 14px rgba(192,88,24,0.18); }
.btn-history {
  display: flex; align-items: center; gap: 7px;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--border2);
  background: var(--surface);
  color: var(--text2); cursor: pointer;
  font-family: var(--jp); font-size: 0.85rem;
  box-shadow: 0 3px 0 var(--border), 0 4px 12px rgba(192,88,24,0.1);
  transition: var(--trans);
}
.btn-history:hover { background: var(--accent); color: white; border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 6px 0 #8b3a08, 0 8px 20px rgba(140,58,8,0.3); }

/* ===== HERO ===== */
.hero {
  position: relative; z-index: 2;
  padding: 64px 28px 56px;
  text-align: center;
  overflow: hidden;
}
.hero-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.45;
  mask-image: radial-gradient(ellipse 70% 100% at 50% 0%, black 40%, transparent 100%);
}
.hero-pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-pill);
  padding: 6px 18px;
  font-size: 0.78rem; color: var(--text2);
  font-family: var(--mono);
  box-shadow: 0 3px 0 var(--border), 0 4px 12px rgba(192,88,24,0.1);
  margin-bottom: 24px;
}
.pill-kana { color: var(--accent); font-weight: 700; }
.pill-dot { color: var(--border2); }
.hero-title {
  display: flex; flex-direction: column; align-items: center;
  gap: 4px; margin-bottom: 16px;
}
.title-kana {
  font-family: var(--display);
  font-size: clamp(1rem, 3vw, 1.4rem);
  color: var(--muted);
  letter-spacing: 0.15em;
  font-weight: 400;
}
.title-latin {
  font-family: var(--display);
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -1.5px;
  line-height: 1.05;
}
.title-latin em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.25em;
}

/* Decorative circles */
.deco-circle {
  position: absolute; border-radius: 50%; pointer-events: none;
  border: 1.5px solid var(--border);
}
.deco-c1 { width: 300px; height: 300px; top: -80px; right: -80px; opacity: 0.4; }
.deco-c2 { width: 180px; height: 180px; bottom: -40px; left: 5%; opacity: 0.3; }
.deco-float {
  position: absolute;
  font-family: var(--mono); font-size: 1.5rem;
  color: var(--accent3); opacity: 0.35;
  animation: floatBob 4s ease-in-out infinite;
  pointer-events: none;
}
.df1 { top: 18%; left: 8%; animation-delay: 0s; }
.df2 { top: 35%; right: 8%; animation-delay: 1s; }
.df3 { bottom: 20%; left: 15%; animation-delay: 2s; }
.df4 { bottom: 25%; right: 12%; animation-delay: 0.5s; }
@keyframes floatBob {
  0%,100% { transform: translateY(0) rotate(-5deg); }
  50%      { transform: translateY(-12px) rotate(5deg); }
}

/* ===== MAIN WRAP ===== */
.main-wrap {
  position: relative; z-index: 2;
  max-width: 1320px; margin: 0 auto;
  padding: 0 28px 80px;
}

/* ===== TAB STRIP ===== */
.tab-strip {
  display: flex; gap: 8px; flex-wrap: wrap;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 7px;
  width: fit-content;
  margin: 0 auto 28px;
  box-shadow: var(--op-shadow);
}
.tab-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 22px;
  border: none; border-radius: calc(var(--radius-xl) - 6px);
  background: transparent;
  color: var(--muted);
  font-family: var(--jp); font-size: 0.9rem;
  cursor: pointer;
  transition: var(--trans);
}
.tb-kana { font-size: 0.8rem; }
.tb-en   { font-size: 0.82rem; }
.tab-btn:hover { color: var(--text2); background: var(--surface2); }
.tab-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  box-shadow: var(--btn-shadow);
  transform: translateY(-3px);
}
.tab-pane { display: none; animation: fadeUp 0.3s ease; }
.tab-pane.active { display: block; }

/* ===== TWO-COLUMN LAYOUT ===== */
.two-col {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

/* ===== FLOAT CARD (INPUT) ===== */
.float-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  /* 3D effect */
  box-shadow: var(--card-shadow);
  transform: perspective(800px) rotateY(-3deg) rotateX(1.5deg);
  transition: transform 0.4s cubic-bezier(0.34,1.2,0.64,1), box-shadow 0.4s ease;
}
.float-card:hover {
  transform: perspective(800px) rotateY(0deg) rotateX(0deg) translateY(-6px);
  box-shadow: var(--card-shadow-hv);
}
.fc-header {
  padding: 14px 22px;
  background: linear-gradient(135deg, var(--surface3), var(--surface2));
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.fc-header::after {
  content: '🍂';
  position: absolute; right: 16px; top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  opacity: 0.4;
  animation: floatBob 3s ease-in-out infinite;
}
.fc-kana {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  margin-bottom: 2px;
}
.fc-en {
  font-weight: 700; font-size: 0.92rem;
  color: var(--accent);
}
.fc-body { padding: 20px 22px 22px; }

/* ===== RESULT CARD ===== */
.result-col { }
.res-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 280px;
  box-shadow: var(--card-shadow);
  transform: perspective(800px) rotateY(3deg) rotateX(1.5deg);
  transition: transform 0.4s cubic-bezier(0.34,1.2,0.64,1), box-shadow 0.4s ease;
}
.res-card:hover {
  transform: perspective(800px) rotateY(0deg) rotateX(0deg) translateY(-6px);
  box-shadow: var(--card-shadow-hv);
}
.rc-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 280px; padding: 30px;
  color: var(--muted); text-align: center;
}
.empty-mon {
  font-family: var(--display);
  font-size: 3rem; color: var(--border2);
  margin-bottom: 12px;
}
.rc-empty p { font-size: 0.85rem; line-height: 1.6; }

/* Result header bar */
.rc-body { }
.rc-number {
  font-family: var(--mono);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 500;
  color: var(--accent);
  padding: 20px 22px 10px;
  word-break: break-all;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, var(--surface3), var(--surface2));
  position: relative;
}
.rc-number::before {
  content: 'Result';
  display: block;
  font-family: var(--jp);
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}
.rc-block { padding: 12px 22px; border-top: 1px solid var(--border); }
.rc-lbl {
  font-size: 0.7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--muted); margin-bottom: 8px;
}
.rc-lbl small { font-size: 0.65rem; font-weight: 400; letter-spacing: 0; }
.rc-formula {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--accent);
  word-break: break-all;
}
.rc-steps { display: flex; flex-direction: column; gap: 4px; max-height: 200px; overflow-y: auto; }
.step-row {
  font-family: var(--mono); font-size: 0.78rem;
  color: var(--text);
  padding: 5px 10px;
  background: var(--surface2);
  border-left: 3px solid var(--accent3);
  border-radius: 0 7px 7px 0;
}
.step-row:empty { display: none; }

/* ===== OP GRID ===== */
.field-lbl {
  display: block; font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--muted); margin-bottom: 8px;
}
.field-lbl small { font-weight: 400; font-size: 0.68rem; letter-spacing: 0; }

.op-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 8px; margin-bottom: 18px; }
.op-6   { grid-template-columns: repeat(3,1fr); }

.op-key {
  padding: 11px 8px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface2);
  color: var(--text2);
  font-family: var(--mono); font-size: 0.92rem; font-weight: 500;
  cursor: pointer;
  box-shadow: var(--op-shadow);
  transform: translateY(-2px);
  transition: var(--trans);
}
.op-key:hover { border-color: var(--accent2); color: var(--accent); transform: translateY(-4px); box-shadow: 0 6px 0 var(--border2), 0 8px 16px rgba(192,88,24,0.18); }
.op-key:active { transform: translateY(1px); box-shadow: 0 1px 0 var(--border2); }
.op-key.active {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-color: var(--accent);
  color: white;
  box-shadow: var(--op-shadow-act);
  transform: translateY(-3px);
}

/* ===== INPUTS ===== */
.two-input { display: flex; gap: 12px; margin-bottom: 16px; }
.input-grp { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.input-grp.mb-3 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 16px !important; }

.jp-field {
  width: 100%;
  background: var(--surface2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  color: var(--text);
  font-family: var(--mono); font-size: 0.92rem;
  outline: none;
  appearance: none;
  transition: var(--trans-fast);
  box-shadow: inset 0 2px 4px rgba(192,88,24,0.06);
}
.jp-field:focus {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px var(--accent-glow), inset 0 2px 4px rgba(224,82,122,0.04);
}
.jp-field option { background: var(--surface); }

/* ===== HITUNG BUTTON ===== */
.btn-keisan {
  width: 100%;
  padding: 13px 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none; border-radius: var(--radius);
  color: white;
  font-family: var(--jp); font-weight: 700;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  cursor: pointer;
  box-shadow: var(--btn-shadow);
  transform: translateY(-3px);
  transition: var(--trans);
}
.btn-keisan:hover { transform: translateY(-6px); box-shadow: var(--btn-shadow-hv); }
.btn-keisan:active { transform: translateY(0); box-shadow: var(--btn-shadow-act); }
.bk-kana { font-size: 0.95rem; }
.bk-en   { font-size: 0.72rem; opacity: 0.75; font-weight: 400; }
.btn-keisan.loading { opacity: 0.7; pointer-events: none; }
.btn-keisan.loading::after {
  content: '';
  display: inline-block; width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white; border-radius: 50%;
  animation: spin 0.6s linear infinite; margin-left: 8px;
}

/* ===== SUB TABS ===== */
.sub-strip {
  display: flex; gap: 6px; flex-wrap: wrap;
  border-bottom: 1.5px solid var(--border);
  padding-bottom: 0; margin-bottom: 24px;
}
.sub-btn {
  display: flex; flex-direction: column; align-items: center;
  padding: 8px 20px;
  border: none; border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--muted);
  font-family: var(--jp); cursor: pointer;
  border-radius: var(--radius) var(--radius) 0 0;
  transition: var(--trans-fast);
}
.sb-kana { font-size: 0.82rem; font-weight: 700; }
.sb-en   { font-size: 0.65rem; opacity: 0.7; }
.sub-btn:hover { color: var(--text2); }
.sub-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.sub-pane { display: none; animation: fadeUp 0.25s ease; }
.sub-pane.active { display: block; }

/* ===== GRIDS ===== */
.basis-grid, .suhu-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 10px; padding: 14px 22px; border-top: 1px solid var(--border);
}
.basis-cell, .suhu-cell {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: 0 3px 0 var(--border), 0 4px 8px rgba(192,88,24,0.06);
  transition: var(--trans-fast);
}
.basis-cell:hover, .suhu-cell:hover { transform: translateY(-2px); box-shadow: 0 5px 0 var(--border2), 0 6px 12px rgba(192,88,24,0.12); }
.bc-label, .sc-label {
  font-size: 0.67rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); margin-bottom: 4px;
}
.bc-val, .sc-val {
  font-family: var(--mono); font-size: 1rem; font-weight: 700;
  color: var(--accent); word-break: break-all;
}
.suhu-cell { text-align: center; }
.sc-emoji { font-size: 1.3rem; margin-bottom: 4px; }

/* ===== RES INLINE (BONUS) ===== */
.res-inline {
  margin-top: 18px;
  border-top: 1.5px solid var(--border);
  padding-top: 14px;
  animation: fadeUp 0.3s ease;
}

/* ===== FIB CHIPS ===== */
.fib-chips { display: flex; flex-wrap: wrap; gap: 5px; padding: 6px 0; }
.fib-chip {
  background: var(--surface2); border: 1px solid var(--border);
  color: var(--text2); font-family: var(--mono); font-size: 0.78rem;
  padding: 4px 10px; border-radius: var(--radius-pill);
  transition: var(--trans-fast);
}
.fib-chip.hl {
  background: var(--accent); border-color: var(--accent);
  color: white; font-weight: 700;
  box-shadow: 0 3px 0 #8b3a08;
}

/* ===== INFO NOTE ===== */
.info-note {
  background: rgba(224,82,122,0.08);
  border: 1px solid var(--border2);
  color: var(--accent);
  border-radius: var(--radius);
  padding: 8px 14px;
  font-family: var(--mono); font-size: 0.78rem;
  margin-bottom: 14px;
}

/* ===== OFFCANVAS ===== */
.offcanvas {
  background: var(--surface) !important;
  border-left: 1px solid var(--border) !important;
  width: 320px !important;
}
.offcanvas-header { border-bottom: 1px solid var(--border); padding: 18px 20px; }
.drawer-title { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); font-size: 0.92rem; }
.kana-badge {
  background: var(--accent-glow); border: 1px solid var(--border2);
  color: var(--accent); padding: 2px 10px; border-radius: var(--radius-pill);
  font-size: 0.68rem; letter-spacing: 0.08em;
}
.btn-x { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 1rem; padding: 4px; transition: var(--trans-fast); }
.btn-x:hover { color: var(--accent); transform: rotate(90deg); }
.offcanvas-body { padding: 16px; overflow-y: auto; }
.drawer-footer { padding: 14px 16px; border-top: 1px solid var(--border); }
.btn-clear-hist {
  width: 100%; padding: 10px;
  background: var(--surface2); border: 1.5px solid var(--border2);
  border-radius: var(--radius); color: var(--accent);
  font-family: var(--jp); font-size: 0.85rem; cursor: pointer;
  box-shadow: 0 3px 0 var(--border2);
  transition: var(--trans-fast);
}
.btn-clear-hist:hover { background: var(--accent); color: white; transform: translateY(-2px); box-shadow: 0 5px 0 #8b3a08; }

.empty-hist { text-align: center; padding: 40px 16px; color: var(--muted); }
.empty-kana { font-family: var(--display); font-size: 1.8rem; color: var(--border2); margin-bottom: 8px; }
.hist-item {
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 14px; margin-bottom: 8px;
  box-shadow: 0 3px 0 var(--border);
  animation: fadeUp 0.2s ease;
}
.hist-op { font-size: 0.75rem; color: var(--muted); font-family: var(--mono); margin-bottom: 3px; word-break: break-all; }
.hist-res { font-size: 0.95rem; font-weight: 700; color: var(--accent); font-family: var(--mono); }

/* ===== ERROR TOAST ===== */
.err-toast {
  position: fixed; bottom: 24px; right: 24px;
  background: #e04060; color: white;
  padding: 12px 18px; border-radius: var(--radius);
  font-family: var(--mono); font-size: 0.85rem;
  z-index: 9999;
  animation: fadeUp 0.3s ease;
  box-shadow: 0 6px 0 #a02040, 0 10px 28px rgba(200,40,80,0.4);
  max-width: 320px;
}

/* ===== FOOTER ===== */
.site-footer {
  position: relative; z-index: 2;
  border-top: 1px solid var(--border);
  padding: 20px 28px;
}
.footer-inner {
  max-width: 1320px; margin: 0 auto;
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 0.78rem; color: var(--muted);
}
.f-sep { color: var(--border2); }
.f-kana { color: var(--accent); opacity: 0.7; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--surface2); }
::-webkit-scrollbar-thumb { background: var(--accent3); border-radius: 3px; }

.jp-field.field-active {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 3px var(--accent-glow) !important;
  background: var(--surface) !important;
}

.mt-2 { margin-top: 10px !important; }

/* ===== CALCULATOR SCREEN ===== */
.calc-screen {
  background: var(--bg3);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius-lg);
  padding: 14px 18px 12px;
  margin-bottom: 14px;
  min-height: 80px;
  display: flex; flex-direction: column; justify-content: flex-end;
  text-align: right;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 3px 12px rgba(192,88,24,0.1);
}
.calc-screen::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent3), transparent);
}
.cs-sub {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  min-height: 18px;
  margin-bottom: 2px;
  word-break: break-all;
  transition: all 0.2s;
}
.cs-expr {
  font-family: var(--mono);
  font-size: 2rem;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
  line-height: 1.2;
  transition: all 0.15s;
}
.cs-expr.entering-b { color: var(--accent); }

/* ===== NUMPAD KEISAN BUTTON ===== */
.nk-keisan {
  background: linear-gradient(135deg, var(--accent), var(--accent2)) !important;
  border-color: var(--accent) !important;
  color: white !important;
  font-family: var(--jp) !important;
  font-size: 0.88rem !important;
  font-weight: 700 !important;
  box-shadow: 0 5px 0 #8b3a08, 0 7px 16px rgba(140,58,8,0.3) !important;
}
.nk-keisan:hover {
  transform: translateY(-5px) !important;
  box-shadow: 0 8px 0 #8b3a08, 0 10px 22px rgba(140,58,8,0.4) !important;
  color: white !important;
}
.nk-keisan:active {
  transform: translateY(1px) !important;
  box-shadow: 0 2px 0 #8b3a08 !important;
}

/* ===== NUMPAD ===== */
.numpad {
  background: var(--surface2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 12px;
  margin-bottom: 16px;
  box-shadow: inset 0 2px 8px rgba(192,88,24,0.06);
}
.numpad-display {
  text-align: center;
  margin-bottom: 10px;
  padding: 4px 0;
}
.nd-active-label {
  font-size: 0.7rem;
  font-family: var(--jp);
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--border2);
  border-radius: var(--radius-pill);
  padding: 3px 12px;
  letter-spacing: 0.05em;
}
.numpad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
}
.nk {
  padding: 12px 6px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--border2), 0 5px 10px rgba(224,82,122,0.08);
  transform: translateY(-2px);
  transition: var(--trans);
  user-select: none;
}
.nk:hover {
  border-color: var(--accent2);
  color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 6px 0 var(--border2), 0 8px 16px rgba(192,88,24,0.14);
}
.nk:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 var(--border2);
}
.nk-zero { grid-column: span 1; }
.nk-op   { color: var(--accent2); border-color: var(--border2); }
.nk-neg  { color: var(--text2); background: var(--surface3); }
.nk-del  {
  background: linear-gradient(135deg, #ffd6e8, #ffb8d4);
  border-color: var(--accent3);
  color: var(--accent);
  box-shadow: 0 4px 0 var(--border2);
}
[data-theme="dark"] .nk-del {
  background: linear-gradient(135deg, var(--surface3), var(--pink-light));
}
.nk-clear {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-color: var(--accent);
  color: white;
  font-weight: 700;
  box-shadow: 0 4px 0 #8b3a08;
}
.nk-clear:hover { box-shadow: 0 6px 0 #8b3a08; color: white; }
.nk-switch {
  background: var(--surface3);
  border-color: var(--border2);
  color: var(--text2);
  font-size: 0.78rem;
  box-shadow: 0 4px 0 var(--border2);
}
.nk-switch:hover { background: var(--accent); color: white; border-color: var(--accent); }
.nk-switch.active-b { background: var(--accent); color: white; border-color: var(--accent); }

/* ===== STANDARD CALCULATOR ===== */
.std-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 900px) { .std-layout { grid-template-columns: 1fr; } }

.std-card { width: 100%; }
.std-body { padding: 16px 18px 18px; }

.std-screen {
  min-height: 100px !important;
  margin-bottom: 16px !important;
}
.std-screen .cs-sub  { font-size: 0.85rem; min-height: 22px; }
.std-screen .cs-expr { font-size: 2.4rem; }

.std-numpad { margin-bottom: 0 !important; }
.std-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

/* operator keys — right column */
.nk-op2 {
  background: linear-gradient(135deg, var(--surface3), var(--pink-light));
  border-color: var(--border2);
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 700;
  box-shadow: 0 4px 0 var(--border2), 0 6px 12px rgba(192,88,24,0.1);
}
.nk-op2:hover  { background: var(--accent); color: white; border-color: var(--accent); }
.nk-op2.active-op {
  background: var(--accent) !important;
  color: white !important;
  border-color: var(--accent) !important;
  box-shadow: var(--op-shadow-act) !important;
}

/* fn keys — top row */
.nk-fn {
  background: var(--surface2);
  border-color: var(--border);
  color: var(--text2);
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: 0 3px 0 var(--border), 0 4px 8px rgba(192,88,24,0.07);
}
.nk-fn:hover { background: var(--surface3); color: var(--accent); border-color: var(--border2); }

/* equals button */
.nk-equals {
  background: linear-gradient(135deg, var(--accent), var(--accent2)) !important;
  border-color: var(--accent) !important;
  color: white !important;
  font-size: 1.4rem !important;
  font-weight: 700 !important;
  box-shadow: 0 5px 0 #8b3a08, 0 7px 16px rgba(140,58,8,0.3) !important;
}
.nk-equals:hover {
  transform: translateY(-5px) !important;
  box-shadow: 0 8px 0 #8b3a08, 0 10px 22px rgba(140,58,8,0.4) !important;
}
.nk-equals:active {
  transform: translateY(1px) !important;
  box-shadow: 0 2px 0 #8b3a08 !important;
}

/* std history */
.std-hist-card { min-height: unset !important; }
.std-hist-item {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
}
.std-hist-item:hover { background: var(--surface2); }
.std-hist-item:first-child { border-top: none; }
.shi-expr {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 3px;
}
.shi-result {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  text-align: right;
}

/* ===== STANDARD CALCULATOR ===== END */

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .main-wrap { padding: 0 16px 60px; }
  .tab-strip { width: 100%; }
  .tab-btn .tb-kana, .tab-btn .tb-en { display: none; }
  .tab-btn { padding: 10px 16px; }
  .float-card, .res-card { transform: none !important; }
  .float-card:hover, .res-card:hover { transform: translateY(-4px) !important; }
  .two-input { flex-direction: column; }
  .op-grid { grid-template-columns: repeat(4,1fr); }
  .basis-grid, .suhu-grid { grid-template-columns: 1fr 1fr; }
}