/* ============================================================
   MARKUP CALCULATOR — styles.css
   Dark/Light theme · DM Serif Display + DM Sans
   ============================================================ */

/* ---------- Shared tokens ---------- */
:root {
  --r-xs: 6px;
  --r-sm: 10px;
  --r:    14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 999px;

  --serif: 'DM Serif Display', Georgia, serif;
  --sans:  'DM Sans', system-ui, sans-serif;

  --max-w: 1100px;
  --hdr: 64px;
}

/* ---------- Light theme (default — on :root so it applies without JS) ---------- */
:root {
  --bg:       #FAFAF8;
  --bg-2:     #F3F2EF;
  --bg-3:     #EAEAE7;
  --bg-4:     #E0DFDC;
  --surface:  #FFFFFF;
  --surface-2:#F7F7F5;
  --surface-3:#EEEDEB;
  --border:   #DDDCD9;
  --border-l: #D0CFCC;
  --border-h: #C0BFBC;

  --text:     #1A1918;
  --text-2:   #3D3C39;
  --text-3:   #6B6A66;
  --text-4:   #9C9B97;

  --copper:   #A97B4F;
  --copper-h: #C8956A;
  --copper-d: #8B6440;
  --copper-s: rgba(169,123,79,.10);

  --green:    #16A34A;
  --green-d:  #16A34A;
  --green-s:  rgba(22,163,74,.08);
  --blue:     #2563EB;
  --blue-s:   rgba(37,99,235,.07);
  --red:      #DC2626;
  --red-s:    rgba(220,38,38,.07);

  --sh-1: 0 1px 3px rgba(0,0,0,.06);
  --sh-2: 0 4px 16px rgba(0,0,0,.07);
  --sh-3: 0 12px 40px rgba(0,0,0,.10);
  --sh-ring: 0 0 0 3px rgba(169,123,79,.20);

  --hdr-bg: rgba(250,250,248,.85);
  color-scheme: light;
}

/* ---------- Dark theme (attribute overrides :root when present) ---------- */
[data-theme="dark"] {
  --bg:       #111111;
  --bg-2:     #191919;
  --bg-3:     #222222;
  --bg-4:     #2C2C2C;
  --surface:  #1A1A1A;
  --surface-2:#242424;
  --surface-3:#2E2E2E;
  --border:   #2E2E2E;
  --border-l: #383838;
  --border-h: #444444;

  --text:     #F0EDE8;
  --text-2:   #C8C3BC;
  --text-3:   #8A8580;
  --text-4:   #5C5955;

  --copper:   #C8956A;
  --copper-h: #DBA878;
  --copper-d: #A67A52;
  --copper-s: rgba(200,149,106,.12);

  --green:    #5BDD9E;
  --green-d:  #2DA06A;
  --green-s:  rgba(91,221,158,.10);
  --blue:     #6EA8FE;
  --blue-s:   rgba(110,168,254,.10);
  --red:      #F87171;
  --red-s:    rgba(248,113,113,.10);

  --sh-1: 0 1px 3px rgba(0,0,0,.3);
  --sh-2: 0 4px 16px rgba(0,0,0,.3);
  --sh-3: 0 12px 40px rgba(0,0,0,.4);
  --sh-ring: 0 0 0 3px rgba(200,149,106,.25);

  --hdr-bg: rgba(17,17,17,.8);
  color-scheme: dark;
}

/* Reset */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);background:var(--bg);color:var(--text);
  line-height:1.6;-webkit-font-smoothing:antialiased;
  transition:background-color .3s,color .3s;
}
img,svg{display:block;max-width:100%}
button{cursor:pointer;font-family:inherit}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
input[type="number"]{-moz-appearance:textfield}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  background:var(--hdr-bg);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:200;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--hdr)}

.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.logo-icon{
  width:36px;height:36px;background:var(--copper);color:var(--bg);
  border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-size:18px;font-weight:400;
}
.logo-text{font-family:var(--serif);font-size:17px;font-weight:400;letter-spacing:-.01em}
.logo-dot{color:var(--copper)}

.header-right{display:flex;align-items:center;gap:6px}

nav{display:flex;gap:2px}
nav a{
  text-decoration:none;color:var(--text-3);font-size:14px;font-weight:400;
  padding:7px 14px;border-radius:var(--r-full);transition:color .15s,background .15s;
}
nav a:hover{color:var(--text);background:var(--surface-2)}

/* Hamburger toggle (mobile only) */
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;align-items:center;
  gap:5px;width:40px;height:40px;background:var(--surface-2);
  border:1px solid var(--border);border-radius:50%;color:var(--text-3);
  transition:all .2s;flex-shrink:0;
}
.nav-toggle:hover{border-color:var(--border-h);background:var(--surface-3)}
.nav-toggle span{display:block;width:16px;height:1.5px;background:currentColor;border-radius:2px;transition:transform .2s,opacity .2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* Theme toggle */
.theme-toggle{
  width:40px;height:40px;
  display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);
  border:1px solid var(--border);
  border-radius:50%;
  color:var(--text-3);
  transition:color .2s,background .2s,border-color .2s;
  margin-left:8px;flex-shrink:0;
}
.theme-toggle:hover{color:var(--copper);border-color:var(--border-h);background:var(--surface-3)}
.theme-toggle svg{display:block;flex-shrink:0}

/* Show moon in light mode (click to go dark), sun in dark mode (click to go light) */
.theme-icon--sun{display:none}
.theme-icon--moon{display:block}
[data-theme="dark"] .theme-icon--sun{display:block}
[data-theme="dark"] .theme-icon--moon{display:none}
[data-theme="light"] .theme-icon--sun{display:none}
[data-theme="light"] .theme-icon--moon{display:block}

/* ============================================================
   HERO CALCULATOR
   ============================================================ */
.section-calc{padding:56px 0 60px;background:var(--bg);border-bottom:1px solid var(--border)}

.calc-header{text-align:center;margin-bottom:40px}
.calc-header h1{
  font-family:var(--serif);
  font-size:clamp(2.2rem,5.5vw,3.2rem);
  font-weight:400;
  color:var(--text);
  letter-spacing:-.02em;
  line-height:1.1;
}
.calc-subtitle{margin-top:12px;color:var(--text-3);font-size:1rem;font-weight:400}

.calc-layout{display:grid;grid-template-columns:1fr 310px;gap:24px;align-items:start}

/* Card */
.calc-main{
  background:var(--surface);
  border-radius:var(--r-xl);
  padding:36px 32px 28px;
  border:1px solid var(--border);
}

/* Fields */
.calc-fields{display:flex;align-items:flex-start;gap:0;margin-bottom:28px}
.field-group{flex:1;min-width:0}

.field-group label{
  display:block;font-size:12px;font-weight:500;
  color:var(--text-3);margin-bottom:8px;letter-spacing:.02em;
}

.input-wrapper{position:relative;display:flex;align-items:center}
.input-prefix,.input-suffix{
  position:absolute;font-size:1.05rem;font-weight:500;
  color:var(--text-4);pointer-events:none;z-index:1;
}
.input-prefix{left:16px}
.input-suffix{right:16px}

.input-wrapper input[type="number"]{
  width:100%;padding:16px 18px;
  font-family:var(--sans);
  font-size:clamp(1.25rem,2.5vw,1.55rem);
  font-weight:500;color:var(--text);
  background:var(--bg-3);
  border:1.5px solid var(--border);
  border-radius:var(--r-sm);outline:none;
  transition:border-color .2s,box-shadow .2s,background .2s;
}

#cost,#selling-price{padding-left:32px}
#markup,#conv-margin,#conv-markup{padding-right:36px}

.input-wrapper input::placeholder{color:var(--text-4)}
.input-wrapper input:focus{border-color:var(--copper);box-shadow:var(--sh-ring);background:var(--bg-4)}

.input-wrapper input.is-calculated{
  background:var(--copper-s);border-color:var(--copper-d);color:var(--copper-h);
}
.input-wrapper input.is-negative{
  background:var(--red-s);border-color:var(--red);color:var(--red);
}

.field-hint{display:block;font-size:11px;color:var(--text-4);margin-top:6px}

.field-separator{display:flex;align-items:center;justify-content:center;padding:0 8px;padding-top:36px;flex-shrink:0}
.op-circle{
  width:30px;height:30px;border-radius:50%;
  background:var(--bg-3);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-weight:500;font-size:13px;color:var(--text-4);
}

/* Results */
.results-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}
.result-card{border-radius:var(--r-sm);padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.result-profit{background:var(--green-s);border:1px solid rgba(91,221,158,.15)}
.result-margin{background:var(--blue-s);border:1px solid rgba(110,168,254,.15)}

.result-label{font-size:11px;font-weight:500;color:var(--text-3);letter-spacing:.02em}
.result-value{
  font-family:var(--sans);
  font-size:clamp(1.4rem,3vw,1.75rem);
  font-weight:600;letter-spacing:-.02em;line-height:1.15;
  transition:color .2s;
}
.result-profit .result-value{color:var(--green)}
.result-margin .result-value{color:var(--blue)}
.result-profit .result-value.is-negative{color:var(--red)}

.result-value-row{display:flex;align-items:center;gap:8px}
.copy-btn{
  background:none;border:none;color:var(--text-4);padding:4px;
  border-radius:var(--r-xs);display:flex;align-items:center;justify-content:center;
  opacity:0;transition:opacity .15s,color .15s,background .15s;flex-shrink:0;
}
.result-card:hover .copy-btn{opacity:1}
.copy-btn:hover{color:var(--text-2);background:var(--bg-3)}
.copy-btn.copied{opacity:1;color:var(--green)}

.calc-actions{display:flex;justify-content:flex-end;gap:8px}
.btn-reset{
  background:none;border:1px solid var(--border);color:var(--text-3);
  padding:8px 20px;border-radius:var(--r-full);font-size:13px;font-weight:500;
  transition:all .15s;
}
.btn-reset:hover{border-color:var(--text-3);color:var(--text)}

/* ============================================================
   SIDEBAR
   ============================================================ */
.calc-sidebar{display:flex;flex-direction:column;gap:14px}

.breakdown-card{
  background:var(--surface);border-radius:var(--r-lg);
  padding:22px;border:1px solid var(--border);
}

.breakdown-title{
  font-family:var(--serif);font-size:14px;font-weight:400;
  color:var(--text-2);margin-bottom:14px;
}

.breakdown-bar-wrap{margin-bottom:16px}
.breakdown-bar{
  height:42px;border-radius:var(--r-full);overflow:hidden;
  background:var(--bg-3);display:flex;position:relative;
}

.bar-empty{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-size:11px;color:var(--text-4);font-weight:500;
}

.bar-cost,.bar-profit{
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;transition:width .4s cubic-bezier(.25,.46,.45,.94);position:relative;
}
.bar-cost{background:var(--copper-d);width:0;border-radius:var(--r-full) 0 0 var(--r-full)}
.bar-profit{background:var(--green-d);width:0;border-radius:0 var(--r-full) var(--r-full) 0}

.bar-label{
  color:#fff;font-size:10px;font-weight:600;white-space:nowrap;
  padding:0 8px;opacity:0;transition:opacity .2s .2s;
}
.bar-label.visible{opacity:1}

.breakdown-legend{display:flex;flex-direction:column;gap:8px}
.legend-item{display:flex;align-items:center;gap:8px;font-size:12.5px}
.legend-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.legend-cost{background:var(--copper)}
.legend-profit{background:var(--green)}
.legend-price{background:var(--text-3)}
.legend-item dt{color:var(--text-3);flex:1;font-weight:400}
.legend-item dd{font-weight:600;color:var(--text);font-size:12.5px}


/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  background:var(--text);color:var(--bg);border:none;
  padding:12px 24px;border-radius:var(--r-full);
  font-size:14px;font-weight:500;
  transition:background .15s,transform .1s,box-shadow .15s;white-space:nowrap;
}
.btn-primary:hover{background:var(--text-2);box-shadow:var(--sh-2);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-primary.btn-sm{padding:10px 16px;font-size:13px}
.btn-primary.btn-full{width:100%}

.btn-secondary{
  display:inline-flex;align-items:center;gap:7px;
  background:transparent;color:var(--text);
  border:1px solid var(--border-h);padding:10px 20px;
  border-radius:var(--r-full);font-size:13px;font-weight:500;
  transition:all .15s;
}
.btn-secondary:hover{background:var(--surface-2);border-color:var(--text-3)}


/* ============================================================
   CONVERTER
   ============================================================ */
.section-alt{padding:72px 0;background:var(--bg-2);border-top:1px solid var(--border)}

.section-header{text-align:center;margin-bottom:44px}
.section-header h2{
  font-family:var(--serif);font-size:clamp(1.5rem,3.5vw,2.2rem);
  font-weight:400;color:var(--text);letter-spacing:-.01em;margin-bottom:10px;
}
.section-header p{color:var(--text-3);font-size:1rem}

.converter-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.converter-fields{display:flex;align-items:center;gap:16px}
.converter-fields .field-group{flex:1}
.converter-fields .field-group input[type="number"]{font-size:clamp(1.4rem,3vw,1.75rem)}
.converter-fields #conv-margin,.converter-fields #conv-markup{padding-right:36px}

.converter-arrow{font-size:1.3rem;color:var(--copper);font-weight:700;flex-shrink:0;padding-top:32px;user-select:none}

.equiv-table-wrap{border-radius:var(--r);overflow:hidden;border:1px solid var(--border);box-shadow:var(--sh-1)}
.equiv-table{width:100%;border-collapse:collapse;font-size:13.5px}
.equiv-table th{
  background:var(--surface-3);color:var(--text-3);
  font-size:11px;font-weight:500;text-transform:uppercase;
  letter-spacing:.06em;padding:12px 16px;text-align:left;
}
.equiv-table td{padding:12px 16px;border-top:1px solid var(--border);color:var(--text-2);background:var(--surface)}
.equiv-table td:first-child{font-weight:600;color:var(--copper)}
.equiv-table td:nth-child(2){font-weight:600;color:var(--green)}
.equiv-table tbody tr:hover td{background:var(--surface-2)}


/* ============================================================
   CONTENT
   ============================================================ */
.section-content{padding:80px 0 96px;background:var(--bg-2);border-top:1px solid var(--border)}

.content-layout{display:grid;grid-template-columns:1fr 272px;gap:56px;align-items:start}

.content-main article{margin-bottom:48px;padding-bottom:48px;border-bottom:1px solid var(--border)}
.content-main article:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}

.content-main h2{
  font-family:var(--serif);font-size:clamp(1.3rem,2.5vw,1.6rem);
  font-weight:400;color:var(--text);margin-bottom:16px;line-height:1.3;
}
.content-main p{color:var(--text-3);margin-bottom:12px;line-height:1.8;font-size:.94rem}
.content-main p:last-child{margin-bottom:0}
.content-main ul,.content-main ol{margin:12px 0 12px 20px;line-height:1.8;font-size:.94rem;color:var(--text-3)}
.content-main li{margin-bottom:5px}
.content-main strong{font-weight:600;color:var(--text)}

.formula-grid{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.formula-card{background:var(--surface-3);border-radius:var(--r-sm);padding:16px 20px;border:1px solid var(--border)}
.formula-label{display:block;font-size:10px;font-weight:500;text-transform:uppercase;letter-spacing:.1em;color:var(--copper);margin-bottom:5px}
.formula-card code{display:block;font-family:monospace;font-size:.84rem;color:var(--text);line-height:1.5;word-break:break-word}

.table-scroll{overflow-x:auto;border-radius:var(--r-sm);border:1px solid var(--border);margin-top:16px;box-shadow:var(--sh-1)}
.industry-table{width:100%;border-collapse:collapse;font-size:13px;min-width:420px}
.industry-table th{
  background:var(--surface-3);color:var(--text-4);
  font-size:10px;font-weight:500;text-transform:uppercase;
  letter-spacing:.1em;padding:11px 14px;text-align:left;white-space:nowrap;
}
.industry-table td{padding:11px 14px;border-top:1px solid var(--border);color:var(--text-3)}
.industry-table td:nth-child(2){font-weight:600;color:var(--copper)}
.industry-table tbody tr:hover td{background:var(--surface-2)}

/* FAQ */
details{
  border:1px solid var(--border);border-radius:var(--r-sm);
  margin-bottom:8px;overflow:hidden;background:var(--surface);
  transition:box-shadow .15s,border-color .15s;
}
details[open]{box-shadow:var(--sh-1);border-color:var(--border-l)}

summary{
  padding:16px 20px;font-weight:500;font-size:.94rem;
  cursor:pointer;list-style:none;display:flex;align-items:center;
  justify-content:space-between;user-select:none;color:var(--text-2);
  transition:background .15s,color .15s;gap:12px;line-height:1.4;
}
summary::-webkit-details-marker{display:none}
summary::after{
  content:'+';font-size:1rem;font-weight:400;color:var(--text-4);
  flex-shrink:0;width:28px;height:28px;
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;background:var(--bg-3);
  transition:transform .2s,background .2s,color .2s;
}
details[open] summary::after{transform:rotate(45deg);background:var(--copper-s);color:var(--copper)}
details[open] summary{color:var(--text)}
summary:hover{background:var(--surface-2);color:var(--text)}

details p{
  padding:4px 20px 18px;font-size:.9rem;
  color:var(--text-3);line-height:1.8;
  border-top:1px solid var(--border);padding-top:14px;
}
details p strong{color:var(--text-2)}

/* ============================================================
   SIDEBAR
   ============================================================ */
.content-sidebar{position:sticky;top:calc(var(--hdr) + 24px);display:flex;flex-direction:column;gap:14px}

.sidebar-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r);padding:20px;
}
.sidebar-card h3{
  font-size:11px;font-weight:500;text-transform:uppercase;
  letter-spacing:.1em;color:var(--text-4);margin-bottom:14px;
}

.quick-ref{display:flex;flex-direction:column}
.ref-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border);font-size:12.5px;gap:8px}
.ref-row:last-child{border-bottom:none}
.ref-row dt{color:var(--text-4)}
.ref-row dd{font-weight:600;color:var(--copper);white-space:nowrap}


.sidebar-formula{background:var(--surface-3);border-color:var(--border-l)}
.sidebar-formula h3{color:var(--text-4)}
.mini-formulas{display:flex;flex-direction:column;gap:9px}
.mini-formulas>div{display:flex;flex-direction:column;gap:3px}
.mini-label{font-size:9px;font-weight:500;text-transform:uppercase;letter-spacing:.12em;color:var(--copper)}
.mini-formulas code{font-family:monospace;font-size:11px;color:var(--text-2);line-height:1.4}

/* ============================================================
   CONTACT
   ============================================================ */
.section-contact{padding:80px 0 96px;background:var(--bg);border-top:1px solid var(--border)}

.contact-layout{
  display:grid;grid-template-columns:1fr 1fr;
  gap:64px;align-items:start;max-width:900px;margin:0 auto;
}

.contact-heading{
  font-family:var(--serif);font-size:clamp(1.6rem,3.5vw,2.2rem);
  font-weight:400;color:var(--text);letter-spacing:-.01em;margin-bottom:12px;
}
.contact-sub{color:var(--text-3);font-size:.94rem;line-height:1.8;margin-bottom:24px}
.contact-reasons{list-style:none;display:flex;flex-direction:column;gap:8px}
.contact-reasons li{
  color:var(--text-3);font-size:.9rem;padding-left:16px;position:relative;
}
.contact-reasons li::before{
  content:'→';position:absolute;left:0;color:var(--copper);font-size:.85rem;
}

.contact-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-xl);padding:32px;
  box-shadow:var(--sh-2);
}

.contact-field{display:flex;flex-direction:column;gap:7px;margin-bottom:16px}
.contact-field label{
  font-size:12px;font-weight:500;color:var(--text-3);letter-spacing:.02em;
}
.contact-field input,.contact-field textarea{
  width:100%;padding:12px 16px;
  font-family:var(--sans);font-size:.94rem;font-weight:400;
  color:var(--text);background:var(--bg-3);
  border:1.5px solid var(--border);border-radius:var(--r-sm);
  outline:none;resize:vertical;
  transition:border-color .2s,box-shadow .2s,background .2s;
}
.contact-field input::placeholder,.contact-field textarea::placeholder{color:var(--text-4)}
.contact-field input:focus,.contact-field textarea:focus{
  border-color:var(--copper);box-shadow:var(--sh-ring);background:var(--bg-4);
}

.hp-field{position:absolute;left:-9999px;visibility:hidden;pointer-events:none;tabindex:-1}
.contact-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px}
.contact-error{font-size:12.5px;color:var(--red);flex:1}

.contact-success:not([hidden]){
  display:flex;align-items:center;gap:10px;margin-top:16px;
  color:var(--green);font-size:.9rem;font-weight:500;
}

/* ============================================================
   AD UNITS
   ============================================================ */
.ad-strip{
  padding:12px 0;
  background:var(--bg-2);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
/* Prevent layout shift before ad loads */
.ad-unit-horizontal{
  display:block;min-height:90px;width:100%;
  background:var(--bg-3);border-radius:var(--r-xs);
}
.ad-unit-sidebar{
  display:block;min-height:250px;width:100%;
  background:var(--bg-3);border-radius:var(--r-xs);
}

/* ============================================================
   FOOTER
   ============================================================ */
footer{background:var(--bg);border-top:1px solid var(--border);padding:28px 0}
.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px}
.footer-tagline{font-size:13px;color:var(--text-4)}
.footer-nav{display:flex;flex-wrap:wrap;gap:2px}
.footer-nav a{
  color:var(--text-4);text-decoration:none;font-size:13px;
  padding:5px 12px;border-radius:var(--r-full);transition:color .15s,background .15s;
}
.footer-nav a:hover{color:var(--text-2);background:var(--surface)}
.footer-copy{font-size:12px;color:var(--text-4)}
.footer-copy a{color:var(--text-4);text-decoration:none;transition:color .15s}
.footer-copy a:hover{color:var(--text-2)}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:920px){
  .contact-layout{grid-template-columns:1fr;gap:32px}
  .contact-text{text-align:center}
  .contact-reasons{align-items:center}
  .contact-reasons li{padding-left:0}
  .contact-reasons li::before{display:none}
}

@media(max-width:920px){
  .calc-layout{grid-template-columns:1fr}
  .calc-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:14px}
  .converter-layout{grid-template-columns:1fr;gap:32px}
  .content-layout{grid-template-columns:1fr;gap:0}
  .content-sidebar{
    position:static;display:grid;grid-template-columns:repeat(3,1fr);
    gap:14px;margin-top:36px;padding-top:36px;border-top:1px solid var(--border);
  }
}

@media(max-width:640px){
  :root{--hdr:54px}
  .container{padding:0 16px}
  .section-calc{padding:32px 0 36px}
  .calc-header h1{font-size:2rem}
  .calc-main{padding:24px 18px 22px;border-radius:var(--r-lg)}
  .calc-fields{flex-direction:column;gap:6px}
  .field-separator{padding-top:0;align-self:center;height:24px}
  .op-circle{width:24px;height:24px;font-size:11px}
  .input-wrapper input[type="number"]{font-size:1.25rem;padding:14px 16px}
  #cost,#selling-price{padding-left:28px}
  #markup{padding-right:32px}
  .results-row{gap:10px}
  .result-value{font-size:1.3rem}
  .calc-sidebar{grid-template-columns:1fr}
  .converter-fields{flex-direction:column;gap:4px}
  .converter-arrow{padding-top:0;text-align:center;padding:4px 0}
  nav{display:none}
  .nav-toggle{display:flex}
  #main-nav.is-open{
    display:flex;flex-direction:column;gap:2px;
    position:fixed;top:var(--hdr);left:0;right:0;
    background:var(--surface);border-bottom:1px solid var(--border);
    padding:12px 16px 16px;z-index:199;box-shadow:var(--sh-3);
  }
  #main-nav.is-open a{
    font-size:.95rem;padding:13px 16px;border-radius:var(--r-sm);
    border-bottom:1px solid var(--border);
  }
  #main-nav.is-open a:last-child{border-bottom:none}
  .footer-inner{flex-direction:column;align-items:center;text-align:center;gap:10px}
  .content-sidebar{grid-template-columns:1fr}
  .section-header h2{font-size:1.3rem}
  .section-alt,.section-content{padding:48px 0}

}