/* ============================================================
   SMARTCALC v3 — style.css
   Design: Premium Editorial Dark/Light
   Fonts: Plus Jakarta Sans + Fraunces (serif accent) + DM Mono
   Palette: Near-black base · Vivid Violet accent · Gold highlight
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,700;1,9..144,400;1,9..144,700&family=DM+Mono:ital,wght@0,400;0,500;1,400&display=swap');

/* ────────────────────────────────────────
   DESIGN TOKENS
─────────────────────────────────────── */
:root {
  --c-bg:         #fafaf8;
  --c-bg2:        #f3f2ed;
  --c-bg3:        #ebe9e2;
  --c-card:       #ffffff;
  --c-card2:      #f7f6f1;
  --c-nav:        rgba(250,250,248,0.90);
  --c-text:       #0a0a08;
  --c-text2:      #2e2c28;
  --c-text3:      #605d55;
  --c-border:     #dedad1;
  --c-border2:    #ccc8bc;

  /* Accent – vivid violet */
  --c-ac:         #7c3aed;
  --c-ac2:        #6d28d9;
  --c-ac-soft:    rgba(124,58,237,0.10);
  --c-ac-glow:    rgba(124,58,237,0.22);
  --c-ac-text:    #7c3aed;

  /* Gold highlight */
  --c-gold:       #d97706;
  --c-gold-soft:  rgba(217,119,6,0.10);

  /* Green success */
  --c-green:      #16a34a;
  --c-green-soft: rgba(22,163,74,0.10);

  /* Red danger */
  --c-red:        #dc2626;

  --shadow-xs:    0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm:    0 2px 8px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md:    0 8px 24px rgba(0,0,0,0.09), 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg:    0 20px 48px rgba(0,0,0,0.12), 0 6px 16px rgba(0,0,0,0.07);
  --shadow-xl:    0 32px 72px rgba(0,0,0,0.16);

  --r-xs:   6px;
  --r-sm:   10px;
  --r:      14px;
  --r-lg:   20px;
  --r-xl:   28px;

  --nav-h:  64px;
  --ease:   cubic-bezier(.4,0,.2,1);
  --t:      0.18s;

  --f-ui:   'Plus Jakarta Sans', system-ui, sans-serif;
  --f-ser:  'Fraunces', Georgia, serif;
  --f-mono: 'DM Mono', 'Courier New', monospace;
}

[data-theme="dark"] {
  --c-bg:         #0e0e0c;
  --c-bg2:        #141412;
  --c-bg3:        #1a1917;
  --c-card:       #181714;
  --c-card2:      #1e1d1a;
  --c-nav:        rgba(14,14,12,0.92);
  --c-text:       #f0ede6;
  --c-text2:      #b8b4ac;
  --c-text3:      #706c62;
  --c-border:     #272420;
  --c-border2:    #302d28;
  --c-ac:         #8b5cf6;
  --c-ac2:        #7c3aed;
  --c-ac-soft:    rgba(139,92,246,0.12);
  --c-ac-glow:    rgba(139,92,246,0.25);
  --c-ac-text:    #a78bfa;
  --c-gold:       #fbbf24;
  --c-gold-soft:  rgba(251,191,36,0.10);
  --c-green:      #4ade80;
  --c-green-soft: rgba(74,222,128,0.10);
  --c-red:        #f87171;
  --shadow-xs:    0 1px 3px rgba(0,0,0,0.3);
  --shadow-sm:    0 2px 8px rgba(0,0,0,0.35);
  --shadow-md:    0 8px 24px rgba(0,0,0,0.45);
  --shadow-lg:    0 20px 48px rgba(0,0,0,0.55);
  --shadow-xl:    0 32px 72px rgba(0,0,0,0.65);
}

/* ────────────────────────────────────────
   RESET & BASE
─────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}
body{font-family:var(--f-ui);background:var(--c-bg);color:var(--c-text);line-height:1.65;font-weight:400;overflow-x:hidden;transition:background var(--t) var(--ease),color var(--t) var(--ease)}
a{color:var(--c-ac-text);text-decoration:none;transition:color var(--t)}
a:hover{color:var(--c-ac)}
img{max-width:100%;display:block}
button,input,select,textarea{font-family:inherit}
::selection{background:var(--c-ac);color:#fff}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:var(--c-bg2)}
::-webkit-scrollbar-thumb{background:var(--c-border2);border-radius:99px}

.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:88px 0}

/* ────────────────────────────────────────
   TYPOGRAPHY
─────────────────────────────────────── */
h1,h2,h3,h4{font-family:var(--f-ui);font-weight:800;letter-spacing:-0.025em;line-height:1.15;color:var(--c-text)}
h1{font-size:clamp(2.5rem,5.5vw,4.4rem);font-weight:800}
h2{font-size:clamp(1.8rem,3.2vw,2.8rem)}
h3{font-size:1.18rem;font-weight:700}
h4{font-size:0.95rem;font-weight:600}
p{color:var(--c-text2);font-weight:400}

.display-serif{font-family:var(--f-ser);font-style:italic;font-weight:700}
.mono{font-family:var(--f-mono)}

/* ────────────────────────────────────────
   NAVIGATION
─────────────────────────────────────── */
.navbar{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);
  background:var(--c-nav);
  backdrop-filter:blur(24px) saturate(180%);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  border-bottom:1px solid var(--c-border);
  z-index:500;
  transition:background var(--t) var(--ease),border-color var(--t);
}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px}

.nav-logo{
  font-family:var(--f-ui);font-weight:800;font-size:1.18rem;
  color:var(--c-text);display:flex;align-items:center;gap:10px;
  letter-spacing:-0.03em;white-space:nowrap;
}
.logo-gem{
  width:36px;height:36px;
  background:linear-gradient(135deg,var(--c-ac),var(--c-ac2));
  border-radius:10px;display:grid;place-items:center;
  font-family:var(--f-mono);font-weight:500;font-size:1rem;color:#fff;
  flex-shrink:0;box-shadow:0 4px 12px var(--c-ac-glow);
}

.nav-links{display:flex;align-items:center;gap:2px;list-style:none}
.nav-links a{font-weight:600;
  font-size:0.83rem;font-weight:500;color:var(--c-text2);
  padding:6px 12px;border-radius:var(--r-xs);
  transition:background var(--t),color var(--t);
}
.nav-links a:hover{background:var(--c-card2);color:var(--c-text)}
.nav-links a.active{background:var(--c-ac-soft);color:var(--c-ac-text);font-weight:600}

.nav-right{display:flex;align-items:center;gap:10px}

/* Theme toggle */
.theme-btn{
  width:48px;height:26px;background:var(--c-border);border:1px solid var(--c-border2);
  border-radius:50px;cursor:pointer;position:relative;
  transition:background var(--t),border-color var(--t);
}
.theme-btn::after{
  content:'';position:absolute;top:3px;left:3px;width:18px;height:18px;
  background:var(--c-card);border-radius:50%;
  transition:transform var(--t) var(--ease);
  box-shadow:0 1px 4px rgba(0,0,0,0.15);
}
[data-theme="dark"] .theme-btn{background:var(--c-ac);border-color:var(--c-ac)}
[data-theme="dark"] .theme-btn::after{transform:translateX(22px);background:#fff}
.t-icon{position:absolute;top:50%;transform:translateY(-50%);font-size:9px;pointer-events:none}
.t-sun{left:6px}.t-moon{right:5px}

/* Hamburger */
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.hamburger span{display:block;width:22px;height:2px;background:var(--c-text);border-radius:2px;transition:all var(--t)}
.hamburger.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

.mobile-nav{
  display:none;position:fixed;top:var(--nav-h);left:0;right:0;
  background:var(--c-card);border-bottom:1px solid var(--c-border);
  padding:12px 20px;z-index:499;flex-direction:column;gap:2px;
  box-shadow:var(--shadow-md);
}
.mobile-nav.open{display:flex}
.mobile-nav a{font-size:0.92rem;font-weight:500;color:var(--c-text2);padding:9px 12px;border-radius:var(--r-xs);transition:background var(--t),color var(--t)}
.mobile-nav a:hover{background:var(--c-card2);color:var(--c-text)}

/* ────────────────────────────────────────
   AD SLOTS
─────────────────────────────────────── */
.ad-top-bar{margin-top:var(--nav-h);background:var(--c-bg2);border-bottom:1px solid var(--c-border);display:flex;align-items:center;justify-content:center;min-height:100px;padding:8px 0}
.ad-slot{background:var(--c-card2);border:1.5px dashed var(--c-border2);border-radius:var(--r-sm);display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--c-text3);font-size:0.7rem;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;gap:3px;transition:background var(--t),border-color var(--t)}
.ad-slot .ad-d{font-size:0.6rem;opacity:0.45}
.ad-leaderboard{width:728px;max-width:100%;height:90px}
.ad-large-rect{width:336px;height:280px}
.ad-medium-rect{width:300px;height:250px}
.ad-skyscraper{width:160px;height:600px}
.ad-half-page{width:300px;height:600px}
.ad-in-art{width:468px;max-width:100%;height:60px}
.sidebar-sticky{position:sticky;top:calc(var(--nav-h)+16px);display:flex;flex-direction:column;gap:16px;align-items:center}
.main-w-sidebar{display:grid;grid-template-columns:1fr 180px;gap:32px;align-items:start}
.ad-mid{display:flex;justify-content:center;padding:28px 0;border-top:1px solid var(--c-border);border-bottom:1px solid var(--c-border);margin:52px 0}
@media(max-width:1020px){.main-w-sidebar{grid-template-columns:1fr}.sidebar-col{display:none}}

/* ────────────────────────────────────────
   BUTTONS
─────────────────────────────────────── */
.btn{
  font-family:var(--f-ui);font-weight:600;font-size:0.88rem;
  padding:11px 24px;border-radius:var(--r-sm);border:none;cursor:pointer;
  display:inline-flex;align-items:center;gap:8px;
  transition:all var(--t) var(--ease);letter-spacing:-0.01em;white-space:nowrap;
}
.btn-violet{background:var(--c-ac);color:#fff}
.btn-violet:hover{background:var(--c-ac2);transform:translateY(-2px);box-shadow:0 8px 20px var(--c-ac-glow);color:#fff}
.btn-outline{background:transparent;color:var(--c-text);border:1.5px solid var(--c-border2)}
.btn-outline:hover{border-color:var(--c-ac);color:var(--c-ac-text);transform:translateY(-2px)}
.btn-ghost{background:var(--c-card2);color:var(--c-text2);border:1px solid var(--c-border)}
.btn-ghost:hover{background:var(--c-bg3);color:var(--c-text)}
.btn-white{background:#fff;color:var(--c-ac)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,0.15);color:var(--c-ac2)}
.btn-sm{padding:8px 16px;font-size:0.82rem;border-radius:var(--r-xs)}

/* ────────────────────────────────────────
   HERO
─────────────────────────────────────── */
.hero{padding:72px 0 80px;position:relative;overflow:hidden}
.hero-mesh{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(ellipse 65% 55% at 90% 10%,rgba(124,58,237,0.08),transparent 60%),
    radial-gradient(ellipse 50% 60% at 10% 90%,rgba(217,119,6,0.06),transparent 55%),
    radial-gradient(ellipse 40% 40% at 50% 50%,rgba(22,163,74,0.03),transparent 50%);
}
.hero-mesh::after{
  content:'';position:absolute;inset:0;
  background-image:
    linear-gradient(var(--c-border) 1px,transparent 1px),
    linear-gradient(90deg,var(--c-border) 1px,transparent 1px);
  background-size:52px 52px;
  opacity:.28;
  mask-image:radial-gradient(ellipse 85% 85% at 50% 0,black 0,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 85% 85% at 50% 0,black 0,transparent 75%);
}
.hero-layout{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr 0.9fr;gap:60px;align-items:center}

.hero-pill{
  display:inline-flex;align-items:center;gap:8px;
  font-size:0.74rem;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--c-text3);margin-bottom:22px;padding:5px 14px;
  border:1px solid var(--c-border);border-radius:50px;background:var(--c-card2);
}
.hero-dot{width:6px;height:6px;border-radius:50%;background:var(--c-ac);box-shadow:0 0 8px var(--c-ac-glow);animation:pulse 2s ease infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.7)}}

.hero h1{margin-bottom:22px;line-height:1.1}
.hero h1 .italic-word{font-family:var(--f-ser);font-style:italic;color:var(--c-ac-text)}
[data-theme="dark"] .hero h1 .italic-word{color:#a78bfa}
.hero-sub{font-size:1.05rem;line-height:1.78;color:var(--c-text2);margin-bottom:36px;max-width:500px;font-weight:400}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:48px}
.hero-meta{display:flex;border:1px solid var(--c-border);border-radius:var(--r);overflow:hidden;background:var(--c-card)}
.hm-item{flex:1;padding:14px 18px;text-align:center;border-right:1px solid var(--c-border)}
.hm-item:last-child{border-right:none}
.hm-num{font-family:var(--f-mono);font-size:1.6rem;font-weight:500;color:var(--c-text);display:block;margin-bottom:2px}
.hm-num .ac{color:var(--c-ac-text)}
.hm-lbl{font-size:0.7rem;text-transform:uppercase;letter-spacing:0.07em;color:var(--c-text3)}

/* Hero card */
.hero-card{
  background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r-xl);
  padding:26px;box-shadow:var(--shadow-xl);position:relative;overflow:hidden;
  transform:perspective(900px) rotateY(-5deg) rotateX(2deg);
  transition:transform .4s var(--ease);
}
.hero-card:hover{transform:perspective(900px) rotateY(-1deg) rotateX(0)}
.hero-card::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--c-ac),transparent);opacity:.5}
.hc-label{font-size:0.68rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--c-text3);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.hc-label::after{content:'';flex:1;height:1px;background:var(--c-border)}
.hc-disp{background:var(--c-bg2);border:1px solid var(--c-border);border-radius:10px;padding:14px 18px;text-align:right;margin-bottom:14px}
.hc-expr{font-size:0.78rem;color:var(--c-text3);display:block;font-family:var(--f-mono)}
.hc-val{font-family:var(--f-mono);font-size:2.2rem;font-weight:500;color:var(--c-text);display:block;line-height:1.2}
.hc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}
.hc-btn{
  height:46px;border-radius:9px;border:1px solid var(--c-border);
  background:var(--c-card2);
  font-family:var(--f-mono);font-size:0.9rem;color:var(--c-text2);
  display:grid;place-items:center;user-select:none;
}
.hc-btn.op{color:var(--c-ac-text);background:transparent;border-color:var(--c-border)}
.hc-btn.eq{background:var(--c-ac);color:#fff;border-color:var(--c-ac);font-size:1.2rem}

.float-tag{
  position:absolute;background:var(--c-card);border:1px solid var(--c-border);
  border-radius:10px;padding:8px 12px;font-size:0.74rem;font-weight:600;
  color:var(--c-text2);box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:6px;
  white-space:nowrap;animation:floatY 3s ease-in-out infinite;
}
.ft1{top:-14px;right:24px;animation-delay:0s}
.ft2{bottom:18px;left:-14px;animation-delay:1.5s}
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}

/* ────────────────────────────────────────
   BELT / TICKER
─────────────────────────────────────── */
.belt{background:var(--c-bg2);border-top:1px solid var(--c-border);border-bottom:1px solid var(--c-border);padding:14px 0;overflow:hidden}
.belt-track{display:flex;gap:24px;animation:beltScroll 40s linear infinite;width:max-content}
@keyframes beltScroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.belt-item{display:flex;align-items:center;gap:6px;font-size:0.82rem;font-weight:500;color:var(--c-text2);white-space:nowrap}
.belt-dot{color:var(--c-ac-text);font-size:0.5rem}

/* ────────────────────────────────────────
   TOOL SECTION LAYOUT
─────────────────────────────────────── */
#tools{scroll-margin-top:calc(var(--nav-h)+8px)}
.tools-shell{display:grid;grid-template-columns:268px 1fr;gap:28px;align-items:start}
@media(max-width:920px){.tools-shell{grid-template-columns:1fr}.tools-sidebar{display:none}}

/* Sidebar */
.tools-sidebar{
  position:sticky;top:calc(var(--nav-h)+16px);
  background:var(--c-card);border:1px solid var(--c-border);
  border-radius:var(--r-lg);overflow:hidden;max-height:calc(100vh - var(--nav-h) - 32px);display:flex;flex-direction:column;
}
.sidebar-hd{padding:14px 16px;border-bottom:1px solid var(--c-border);font-size:0.68rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--c-text3);flex-shrink:0}
.sidebar-search{padding:10px 14px;border-bottom:1px solid var(--c-border);flex-shrink:0}
.sidebar-search input{width:100%;background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-xs);padding:7px 12px;font-size:0.82rem;color:var(--c-text);outline:none;transition:border-color var(--t)}
.sidebar-search input:focus{border-color:var(--c-ac)}
.sidebar-list{overflow-y:auto;flex:1;padding:8px}
.s-cat{padding:10px 10px 4px;font-size:0.65rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--c-text3)}
.s-tool{font-weight:500;
  width:100%;display:flex;align-items:center;gap:9px;
  padding:8px 10px;border:none;background:none;border-radius:var(--r-xs);
  cursor:pointer;text-align:left;color:var(--c-text2);font-size:0.84rem;font-weight:500;
  transition:background var(--t),color var(--t);
}
.s-tool:hover{background:var(--c-card2);color:var(--c-text)}
.s-tool.active{background:var(--c-ac-soft);color:var(--c-ac-text);font-weight:600}
.s-tool .s-icon{font-size:0.95rem;width:20px;text-align:center;flex-shrink:0}

/* Panel area */
.tool-area{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r-lg);overflow:hidden;min-height:500px}
.tool-hd{display:flex;align-items:center;gap:14px;padding:18px 22px;border-bottom:1px solid var(--c-border);background:var(--c-card2)}
.tool-hd-icon{width:42px;height:42px;background:var(--c-ac-soft);border:1px solid var(--c-ac);border-radius:10px;display:grid;place-items:center;font-size:1.1rem;flex-shrink:0}
.tool-hd-meta h3{font-size:1.05rem;margin-bottom:2px}
.tool-hd-meta p{font-size:0.78rem;color:var(--c-text3)}
.tool-body{padding:22px}
.tool-pane{display:none}
.tool-pane.active{display:block}

/* ────────────────────────────────────────
   CALC DISPLAY & BUTTONS
─────────────────────────────────────── */
.calc-disp{
  background:var(--c-bg2);border:1px solid var(--c-border);border-radius:10px;
  padding:14px 18px;margin-bottom:14px;text-align:right;min-height:82px;
  display:flex;flex-direction:column;justify-content:flex-end;
}
.c-expr{font-family:var(--f-mono);font-size:0.78rem;color:var(--c-text3);min-height:16px;word-break:break-all;display:block}
.c-num{font-family:var(--f-mono);font-size:2.4rem;font-weight:500;color:var(--c-text);word-break:break-all;line-height:1.2;display:block}

.c-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}
.cb{
  font-family:var(--f-mono);font-weight:500;font-size:0.95rem;height:56px;
  border:1px solid var(--c-border);border-radius:var(--r-sm);
  background:var(--c-card2);color:var(--c-text);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:all .12s;user-select:none;-webkit-tap-highlight-color:transparent;
}
.cb:hover{background:var(--c-bg3);transform:translateY(-1px);box-shadow:var(--shadow-xs)}
.cb:active{transform:scale(.96)}
.cb.op{color:var(--c-ac-text);background:var(--c-ac-soft);border-color:transparent;font-size:1.1rem}
.cb.op:hover{background:var(--c-ac);color:#fff}
.cb.fn{font-size:0.78rem;color:var(--c-text2);font-family:var(--f-ui);font-weight:600}
.cb.fn:hover{background:var(--c-bg3)}
.cb.eq{background:var(--c-ac);color:#fff;border-color:var(--c-ac);font-size:1.3rem}
.cb.eq:hover{background:var(--c-ac2);box-shadow:0 4px 16px var(--c-ac-glow)}
.cb.s2{grid-column:span 2}.cb.s3{grid-column:span 3}

.sci-rows{display:flex;flex-direction:column;gap:5px;margin-bottom:10px}
.sci-r{display:grid;grid-template-columns:repeat(5,1fr);gap:5px}
.sb{
  font-family:var(--f-mono);font-size:0.72rem;font-weight:500;height:34px;
  border:1px solid var(--c-border);border-radius:7px;
  background:var(--c-bg2);color:var(--c-text2);cursor:pointer;transition:all var(--t);
}
.sb:hover{background:var(--c-ac);color:#fff;border-color:var(--c-ac)}

/* History */
.calc-hist{margin-top:16px;padding-top:16px;border-top:1px solid var(--c-border)}
.hist-hd{display:flex;justify-content:space-between;align-items:center;font-size:0.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--c-text3);margin-bottom:8px}
.hist-clear{background:none;border:none;color:var(--c-ac-text);font-size:0.75rem;font-weight:600;cursor:pointer;font-family:var(--f-ui)}
.hist-scroll{max-height:140px;overflow-y:auto;display:flex;flex-direction:column;gap:4px}
.hist-item{display:flex;justify-content:space-between;padding:6px 10px;border-radius:6px;background:var(--c-bg2);font-size:0.8rem;color:var(--c-text2);font-family:var(--f-mono)}
.hist-r{font-weight:500;color:var(--c-text)}

/* ────────────────────────────────────────
   FORM ELEMENTS
─────────────────────────────────────── */
.fset{display:flex;flex-direction:column;gap:14px}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.f3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.fld{display:flex;flex-direction:column;gap:5px}
.flbl{font-size:0.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--c-text3)}

.fi,.fsel{
  width:100%;background:var(--c-bg2);border:1px solid var(--c-border);
  border-radius:var(--r-sm);padding:10px 13px;
  font-family:var(--f-ui);font-size:0.9rem;color:var(--c-text);outline:none;
  transition:border-color var(--t),box-shadow var(--t);
}
.fi:focus,.fsel:focus{border-color:var(--c-ac);box-shadow:0 0 0 3px var(--c-ac-soft)}
.fi.lg{font-family:var(--f-mono);font-size:1.3rem;font-weight:500;text-align:right;padding:12px 16px}
.fsel{appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:34px}
.ftxt{width:100%;background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:10px 13px;font-family:var(--f-ui);font-size:0.9rem;color:var(--c-text);outline:none;resize:vertical;min-height:120px;transition:border-color var(--t),box-shadow var(--t)}
.ftxt:focus{border-color:var(--c-ac);box-shadow:0 0 0 3px var(--c-ac-soft)}

/* Result box */
.rbox{
  background:var(--c-ac-soft);border:1px solid var(--c-ac);
  border-radius:var(--r);padding:18px 20px;
}
.rbox.gold{background:var(--c-gold-soft);border-color:var(--c-gold)}
.rbox.green{background:var(--c-green-soft);border-color:var(--c-green)}
.rval{font-family:var(--f-mono);font-size:2rem;font-weight:500;color:var(--c-ac-text);display:block;margin-bottom:4px;word-break:break-all}
[data-theme="dark"] .rval{color:#a78bfa}
.rbox.gold .rval{color:var(--c-gold)}
.rbox.green .rval{color:var(--c-green)}
.rsub{font-size:0.84rem;color:var(--c-text2)}
.rgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.ritem .rv{font-family:var(--f-mono);font-weight:500;font-size:1.05rem;color:var(--c-text)}
.ritem .rl{font-size:0.72rem;color:var(--c-text3);text-transform:uppercase;letter-spacing:.06em}

/* Info box */
.ibox{background:var(--c-card2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:12px 14px;font-size:0.82rem;color:var(--c-text2);line-height:1.65;margin-top:12px}
.ibox strong{color:var(--c-text)}

/* Radio tabs */
.rtabs{display:flex;gap:4px;padding:4px;background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-sm);margin-bottom:16px}
.rtab{flex:1;padding:8px 10px;border:none;background:transparent;border-radius:var(--r-xs);font-size:0.8rem;font-weight:600;color:var(--c-text2);cursor:pointer;text-align:center;transition:all var(--t)}
.rtab.active{background:var(--c-ac);color:#fff}

/* Sub-panel boxes */
.sub-panel{background:var(--c-card2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:16px}
.sub-panel h4{font-size:0.9rem;margin-bottom:12px;color:var(--c-text)}

/* Converter swap */
.conv-layout{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:end}
@media(max-width:560px){.conv-layout{grid-template-columns:1fr}}
.swap-btn{width:38px;height:38px;border-radius:50%;background:var(--c-card2);border:1px solid var(--c-border);display:grid;place-items:center;font-size:1rem;cursor:pointer;color:var(--c-ac-text);transition:all var(--t);align-self:flex-end;margin-bottom:0}
.swap-btn:hover{background:var(--c-ac);color:#fff;border-color:var(--c-ac);transform:rotate(180deg)}

/* Currency live status */
.live-badge{display:inline-flex;align-items:center;gap:5px;font-size:0.7rem;font-weight:600;color:var(--c-green);padding:3px 8px;border-radius:50px;background:var(--c-green-soft);border:1px solid var(--c-green)}
.live-dot{width:5px;height:5px;border-radius:50%;background:var(--c-green);animation:pulse 2s ease infinite}
.stale-badge{color:var(--c-gold);background:var(--c-gold-soft);border-color:var(--c-gold)}

/* GPA table */
.gpa-tbl{width:100%;border-collapse:collapse}
.gpa-tbl th{font-size:0.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--c-text3);padding:7px 9px;border-bottom:1px solid var(--c-border);text-align:left}
.gpa-tbl td{padding:6px 8px;border-bottom:1px solid var(--c-border);font-size:0.84rem}
.gpa-tbl input,.gpa-tbl select{width:100%;background:none;border:none;outline:none;font-family:var(--f-ui);font-size:0.84rem;color:var(--c-text)}
.del-btn{background:none;border:none;cursor:pointer;color:var(--c-text3);font-size:0.88rem;padding:2px 6px;transition:color var(--t)}
.del-btn:hover{color:var(--c-red)}

/* Color preview */
.color-prev{width:100%;height:76px;border-radius:var(--r-sm);border:1px solid var(--c-border);margin-bottom:14px;transition:background .2s}
.swatches{display:flex;gap:5px;flex-wrap:wrap;margin-top:6px}
.sw{width:26px;height:26px;border-radius:5px;cursor:pointer;border:2px solid transparent;transition:all var(--t)}
.sw:hover{transform:scale(1.15);border-color:var(--c-text)}

/* Matrix */
.matrix-input{display:inline-grid;gap:5px;background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:10px}
.matrix-input input{width:56px;text-align:center;background:var(--c-card);border:1px solid var(--c-border);border-radius:5px;padding:6px 4px;font-family:var(--f-mono);font-size:0.88rem;color:var(--c-text);outline:none;transition:border-color var(--t)}
.matrix-input input:focus{border-color:var(--c-ac)}
.matrix-res{font-family:var(--f-mono);background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:14px;font-size:0.88rem;color:var(--c-text);margin-top:10px;white-space:pre;overflow-x:auto}

/* Base output */
.base-out{background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:12px 14px;display:grid;grid-template-columns:70px 1fr;gap:6px 14px;align-items:center;margin-top:8px}
.blab{font-size:0.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--c-text3)}
.bval{font-family:var(--f-mono);font-size:0.88rem;color:var(--c-text);word-break:break-all}
.bval.ac{color:var(--c-ac-text);font-weight:600}

/* Stats table */
.stats-out{background:var(--c-bg2);border:1px solid var(--c-border);border-radius:var(--r-sm);padding:14px;font-size:0.84rem;margin-top:10px}
.stats-row{display:flex;justify-content:space-between;padding:4px 0;border-bottom:1px solid var(--c-border)}
.stats-row:last-child{border-bottom:none}
.stats-row .sk{color:var(--c-text2)}.stats-row .sv{font-family:var(--f-mono);font-weight:500;color:var(--c-text)}

/* ────────────────────────────────────────
   FEATURES SECTION
─────────────────────────────────────── */
.sec-tag{display:inline-flex;align-items:center;gap:6px;font-size:0.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--c-ac-text);margin-bottom:10px}
.sec-tag::before{content:'◆';font-size:.45rem}

.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feat-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r-lg);padding:24px;transition:all .25s var(--ease);position:relative;overflow:hidden}
.feat-card::after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--c-ac),var(--c-gold));transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.feat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--c-border2)}
.feat-card:hover::after{transform:scaleX(1)}
.feat-card.wide{grid-column:span 2}
.feat-ico{width:44px;height:44px;border-radius:10px;background:var(--c-ac-soft);border:1px solid var(--c-ac);display:grid;place-items:center;font-size:1.15rem;margin-bottom:14px}
.feat-card h3{margin-bottom:7px;font-size:1rem}
.feat-card p{font-size:0.86rem;line-height:1.65}

/* ────────────────────────────────────────
   HOW IT WORKS
─────────────────────────────────────── */
.steps-wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--c-border)}
@media(max-width:768px){.steps-wrap{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.steps-wrap{grid-template-columns:1fr}}
.step-box{background:var(--c-card);padding:32px 24px;transition:background .2s}
.step-box:hover{background:var(--c-card2)}
.step-n{font-family:var(--f-ser);font-style:italic;font-size:3.8rem;font-weight:700;color:var(--c-border2);display:block;line-height:1;margin-bottom:14px;transition:color .2s}
.step-box:hover .step-n{color:var(--c-ac-text)}
.step-box h3{font-size:0.95rem;margin-bottom:7px}
.step-box p{font-size:0.83rem;line-height:1.65}

/* ────────────────────────────────────────
   FAQ
─────────────────────────────────────── */
.faq-layout{display:grid;grid-template-columns:340px 1fr;gap:60px;align-items:start}
@media(max-width:880px){.faq-layout{grid-template-columns:1fr;gap:32px}}
.faq-left{position:sticky;top:calc(var(--nav-h)+20px)}
.faq-left h2{margin-bottom:12px}
.faq-left p{font-size:0.95rem;margin-bottom:20px}

.faq-list{display:flex;flex-direction:column;gap:8px}
.faq-item{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r);overflow:hidden;transition:border-color .2s}
.faq-item.open{border-color:var(--c-ac)}
.faq-q{width:100%;background:none;border:none;padding:17px 20px;display:flex;justify-content:space-between;align-items:center;gap:12px;font-family:var(--f-ui);font-size:0.93rem;font-weight:600;color:var(--c-text);text-align:left;cursor:pointer;transition:color .2s}
.faq-item.open .faq-q{color:var(--c-ac-text)}
.faq-ic{width:22px;height:22px;border-radius:50%;background:var(--c-card2);border:1px solid var(--c-border);display:grid;place-items:center;flex-shrink:0;font-size:0.88rem;color:var(--c-text3);transition:all .25s var(--ease)}
.faq-item.open .faq-ic{background:var(--c-ac);border-color:var(--c-ac);color:#fff;transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;padding:0 20px;font-size:0.87rem;line-height:1.75;color:var(--c-text2);transition:max-height .35s ease,padding .2s}
.faq-item.open .faq-a{max-height:400px;padding-bottom:18px}

/* ────────────────────────────────────────
   CTA STRIP
─────────────────────────────────────── */
.cta-box{
  background:linear-gradient(135deg,var(--c-ac),var(--c-ac2));
  border-radius:var(--r-xl);padding:56px 48px;text-align:center;
  margin:80px 0;position:relative;overflow:hidden;
}
.cta-box::before{content:'';position:absolute;top:-80px;right:-80px;width:280px;height:280px;background:rgba(255,255,255,.06);border-radius:50%}
.cta-box::after{content:'';position:absolute;bottom:-60px;left:-60px;width:220px;height:220px;background:rgba(255,255,255,.04);border-radius:50%}
.cta-box h2,.cta-box p{color:#fff;position:relative;z-index:1}
.cta-box h2{margin-bottom:10px}
.cta-box p{opacity:.85;margin-bottom:26px;font-size:1rem}
.cta-box .btn{position:relative;z-index:1}

/* Trust bar */
.trust-bar{background:var(--c-card);border-top:1px solid var(--c-border);border-bottom:1px solid var(--c-border);padding:18px 0}
.trust-inner{display:flex;align-items:center;justify-content:center;gap:40px;flex-wrap:wrap}
.trust-item{display:flex;align-items:center;gap:8px;font-size:0.82rem;font-weight:600;color:var(--c-text2)}

/* ────────────────────────────────────────
   FOOTER
─────────────────────────────────────── */
.footer{background:var(--c-bg2);border-top:1px solid var(--c-border);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}}
.f-brand .fl{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.1rem;color:var(--c-text);letter-spacing:-.02em;margin-bottom:12px}
.f-brand p{font-size:0.86rem;line-height:1.7;max-width:260px;margin:0 0 18px}
.f-socials{display:flex;gap:7px}
.soc{width:32px;height:32px;border-radius:7px;background:var(--c-card);border:1px solid var(--c-border);display:grid;place-items:center;font-size:0.8rem;color:var(--c-text3);transition:all var(--t)}
.soc:hover{background:var(--c-ac);border-color:var(--c-ac);color:#fff}
.f-col h4{font-size:0.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--c-text3);margin-bottom:14px}
.f-col ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.f-col ul a{font-size:0.86rem;color:var(--c-text2);transition:color var(--t)}
.f-col ul a:hover{color:var(--c-text)}
.footer-bot{border-top:1px solid var(--c-border);padding:18px 0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px}
.footer-bot p{font-size:0.8rem;color:var(--c-text3)}
.f-legal{display:flex;gap:18px}
.f-legal a{font-size:0.8rem;color:var(--c-text3);transition:color var(--t)}
.f-legal a:hover{color:var(--c-text)}

/* ────────────────────────────────────────
   INNER PAGES
─────────────────────────────────────── */
.page-hero{padding:68px 0 52px;background:var(--c-bg2);border-bottom:1px solid var(--c-border)}
.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:14px;font-size:0.78rem;color:var(--c-text3)}
.breadcrumb a{color:var(--c-text3)}.breadcrumb a:hover{color:var(--c-text)}
.prose{max-width:720px}
.prose h2{font-size:1.4rem;margin:38px 0 12px}
.prose h3{font-size:1.05rem;margin:24px 0 9px}
.prose p{font-size:0.94rem;line-height:1.82;margin-bottom:14px}
.prose ul,.prose ol{margin:0 0 14px 20px;display:flex;flex-direction:column;gap:7px}
.prose li{font-size:0.94rem;color:var(--c-text2);line-height:1.7}
.prose a{color:var(--c-ac-text);text-decoration:underline;text-underline-offset:3px}
.callout{background:var(--c-ac-soft);border:1px solid var(--c-ac);border-left:3px solid var(--c-ac);border-radius:0 var(--r-sm) var(--r-sm) 0;padding:14px 18px;margin:22px 0}
.callout p{color:var(--c-text);margin:0;font-size:0.9rem}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
@media(max-width:768px){.contact-grid{grid-template-columns:1fr;gap:36px}}
.contact-form{display:flex;flex-direction:column;gap:14px}
.ci-item{display:flex;align-items:flex-start;gap:13px;margin-bottom:22px}
.ci-ico{width:40px;height:40px;background:var(--c-ac-soft);border:1px solid var(--c-ac);border-radius:9px;display:grid;place-items:center;font-size:1rem;flex-shrink:0}
.ci-tx h4{font-size:0.88rem;margin-bottom:3px}.ci-tx p{font-size:0.83rem}

/* Toast */
.toast{position:fixed;bottom:22px;right:22px;background:var(--c-text);color:var(--c-bg);font-size:0.84rem;font-weight:600;padding:11px 18px;border-radius:var(--r-sm);z-index:9998;transform:translateY(60px);opacity:0;transition:all .28s var(--ease);pointer-events:none}
.toast.show{transform:translateY(0);opacity:1}

/* ────────────────────────────────────────
   RESPONSIVE
─────────────────────────────────────── */
@media(max-width:900px){.hero-layout{grid-template-columns:1fr;gap:36px}.hero-card{display:none}.feat-grid{grid-template-columns:1fr 1fr}.feat-card.wide{grid-column:span 1}}
@media(max-width:768px){.nav-links{display:none}.hamburger{display:flex}section{padding:60px 0}.feat-grid{grid-template-columns:1fr}.faq-layout{grid-template-columns:1fr}.faq-left{position:static}.cta-box{padding:36px 22px}.hero-meta{flex-direction:column}.hm-item{border-right:none;border-bottom:1px solid var(--c-border)}.hm-item:last-child{border-bottom:none}.frow{grid-template-columns:1fr}.f3{grid-template-columns:1fr 1fr}}
@media(max-width:480px){h1{font-size:2.2rem}.c-grid{gap:5px}.cb{height:48px;font-size:0.88rem}.footer-grid{grid-template-columns:1fr}.f-legal{flex-wrap:wrap;gap:10px}}
@media print{.navbar,.ad-top-bar,.ad-slot,.mobile-nav{display:none!important}}

/* ── FONT DARKNESS OVERRIDE v3.1 ─────────────────────────────────
   Boosts text weight and contrast across all UI elements
──────────────────────────────────────────────────────────────── */

/* Light mode: strengthen text contrast */
:root {
  --c-text:   #080806;
  --c-text2:  #2a2824;
  --c-text3:  #5a5750;
}

[data-theme="dark"] {
  --c-text:   #f4f1ea;
  --c-text2:  #c0bbb2;
  --c-text3:  #7a7670;
}

/* Body copy — ensure minimum legible weight */
body { font-weight: 400; }

/* All paragraph text — heavier and darker */
p, li, .rsub, .faq-a, .prose p, .prose li,
.feat-card p, .step-box p, .ibox, .f-brand p,
.hero-sub, .hm-lbl, .belt-item, .trust-item,
.tool-hd-meta p, .ci-tx p, .callout p { 
  color: var(--c-text2); 
  font-weight: 400; 
}

/* Labels & meta — slightly heavier for readability */
.flbl, .hist-hd, .s-cat, .sidebar-hd,
.sec-tag, .hm-lbl, .trust-item,
.f-col h4, .footer-bot p, .footer-bot a,
.flbl, .blab, .belt-item { 
  font-weight: 700; 
}

/* Nav links — strong and clear */
.nav-links a, .mobile-nav a, .f-col ul a { 
  font-weight: 600; 
  color: var(--c-text2); 
}
.nav-links a:hover, .mobile-nav a:hover { color: var(--c-text); }

/* Sidebar tool names */
.s-tool { font-weight: 600; color: var(--c-text2); }
.s-tool:hover { color: var(--c-text); }

/* Trust bar — full darkness */
.trust-item { color: var(--c-text); font-weight: 600; }

/* Hero sub — slightly bolder */
.hero-sub { font-weight: 400; color: var(--c-text2); }

/* FAQ trigger */
.faq-q { color: var(--c-text); font-weight: 700; }

/* FAQ answer */
.faq-a { color: var(--c-text2); font-weight: 400; }

/* Feature card text */
.feat-card h3 { color: var(--c-text); font-weight: 700; }
.feat-card p  { color: var(--c-text2); }

/* Step boxes */
.step-box h3 { color: var(--c-text); font-weight: 700; }
.step-box p  { color: var(--c-text2); }

/* Info box */
.ibox { color: var(--c-text2); font-weight: 400; }
.ibox strong { color: var(--c-text); font-weight: 700; }

/* Footer col links */
.f-col ul a { color: var(--c-text2); }
.f-col ul a:hover { color: var(--c-text); }

/* Belt items */
.belt-item { color: var(--c-text2); }

/* Prose body */
.prose p, .prose li { color: var(--c-text2); }
.prose h2, .prose h3 { color: var(--c-text); }
.prose strong { color: var(--c-text); font-weight: 700; }

/* Contact info */
.ci-tx h4 { color: var(--c-text); font-weight: 700; }
.ci-tx p  { color: var(--c-text2); }

/* Result sub labels */
.rsub { color: var(--c-text2); font-weight: 500; }
.ritem .rl { color: var(--c-text3); font-weight: 600; letter-spacing: .04em; }
.ritem .rv { color: var(--c-text); font-weight: 600; }

/* History items */
.hist-item { color: var(--c-text2); }
.hist-r { color: var(--c-text); font-weight: 600; }

/* Section sub-heading below hero */
section p:first-of-type { color: var(--c-text2); }

/* Headings — max weight for impact */
h1 { font-weight: 800; color: var(--c-text); }
h2 { font-weight: 800; color: var(--c-text); }
h3 { font-weight: 700; color: var(--c-text); }
h4 { font-weight: 700; color: var(--c-text); }

/* Footer brand text */
.f-brand p { color: var(--c-text2); font-weight: 400; }

/* Page hero sub */
.page-hero p { color: var(--c-text2); font-weight: 400; font-size: 1.05rem; }

/* Tool header desc */
.tool-hd-meta p { color: var(--c-text3); font-weight: 500; }

/* Field labels */
.flbl { color: var(--c-text3); font-weight: 700; }

/* Callout */
.callout p { color: var(--c-text); font-weight: 400; }

/* Hero pill */
.hero-pill { color: var(--c-text2); font-weight: 600; }

/* HM lbl (hero stats labels) */
.hm-lbl { color: var(--c-text3); font-weight: 700; }

/* Breadcrumb */
.breadcrumb, .breadcrumb a, .breadcrumb span { color: var(--c-text3); font-weight: 500; }
.breadcrumb a:hover { color: var(--c-text); }

/* Footer bottom */
.footer-bot p { color: var(--c-text3); font-weight: 500; }
.footer-bot a { color: var(--c-text3); font-weight: 500; }
.footer-bot a:hover { color: var(--c-text); }

/* ── CONTACT FORM VALIDATION STYLES ──────────────────────────────── */
.contact-form .fi:invalid:not(:placeholder-shown),
.contact-form .fsel:invalid:not(:placeholder-shown) {
  border-color: var(--c-red);
}
.contact-form .fi:valid:not(:placeholder-shown),
.contact-form .fsel:valid:not(:placeholder-shown) {
  border-color: var(--c-green);
}
.contact-form textarea.fi:valid:not(:placeholder-shown),
.contact-form .ftxt:not(:placeholder-shown) {
  border-color: var(--c-green);
}
.field-err {
  display: block;
  font-size: .76rem;
  color: var(--c-red);
  margin-top: 4px;
  font-weight: 600;
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from{opacity:0;transform:translateY(-4px)} to{opacity:1;transform:translateY(0)} }

/* Shake animation for invalid submit attempt */
.form-shake {
  animation: shake .35s ease;
}
@keyframes shake {
  0%,100%{transform:translateX(0)}
  20%{transform:translateX(-6px)}
  40%{transform:translateX(6px)}
  60%{transform:translateX(-4px)}
  80%{transform:translateX(4px)}
}