/* ============================================================
   EFFICIENCO DESIGN SYSTEM
   Version 1.0
   Apply to every tool page. Never override core variables.
   ============================================================ */

/* ── TOKENS ─────────────────────────────────────────────── */
:root {
  /* Brand */
  --color-primary:#0f0f13;
  --color-primary-hover: #16213e;
  --color-accent:        #0f7aff;
  --color-accent-hover:  #0062d6;
  --color-accent-light:  #e8f2ff;

  /* Surface */
  --color-bg:            #ffffff;
  --color-bg-secondary:  #f8f9fa;
  --color-bg-tertiary:   #f0f2f5;
  --color-result-bg:     #f0f7ff;

  /* Text */
  --color-text-primary:   #0d0d0d;
  --color-text-secondary: #4a4a4a;
  --color-text-muted:     #767676;
  --color-text-inverse:   #ffffff;

  /* Borders */
  --color-border:         #e2e5ea;
  --color-border-focus:   #0f7aff;
  --color-border-error:   #dc3545;

  /* Feedback */
  --color-success:        #1a7f4b;
  --color-success-bg:     #e6f7ed;
  --color-error:          #dc3545;
  --color-error-bg:       #fff0f0;
  --color-warning:        #b45309;
  --color-warning-bg:     #fffbeb;

  /* Typography */
  --font-sans:  'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;

  /* Type scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;

  /* Weights */
  --font-normal:  400;
  --font-medium:  500;
  --font-semibold: 600;

  /* Spacing scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg:  0 8px 24px rgba(0,0,0,0.1);
  --shadow-focus: 0 0 0 3px rgba(15,122,255,0.2);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;

  /* Layout */
  --max-width-tool:    760px;
  --max-width-content: 680px;
  --max-width-wide:    1100px;
}

/* ── RESET ───────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ══════════════════════════════════════════════════
   GLOBAL HEADER & FOOTER
══════════════════════════════════════════════════ */
:root {
  --header-h: 62px;
}

body {
  padding-top: var(--header-h);
}

#header { 
  position: fixed; 
  inset: 0 0 auto 0; 
  height: var(--header-h); 
  background: rgba(255, 255, 255, 0.96); 
  backdrop-filter: blur(16px); 
  -webkit-backdrop-filter: blur(16px); 
  border-bottom: 1px solid var(--color-border); 
  z-index: 200; 
  transition: box-shadow var(--transition-fast); 
}

#header .container { 
  height: 100%; 
}

#header.scrolled { 
  box-shadow: 0 1px 0 var(--color-border), 0 2px 12px rgba(0, 0, 0, 0.06); 
}

.header-inner { 
  display: flex; 
  align-items: center; 
  height: 100%; 
  gap: var(--space-6); 
}

.logo { 
  display: flex; 
  align-items: center; 
  gap: 9px; 
  flex-shrink: 0; 
  color: var(--color-text-primary); 
  text-decoration: none; 
}
.logo:hover { text-decoration: none; }

.logo-mark { 
  width: 28px; 
  height: 28px; 
  background: var(--color-primary); 
  border-radius: var(--radius-sm); 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  flex-shrink: 0; 
}
.logo-mark svg { width: 16px; height: 16px; }

.logo-wordmark { 
  font-family: var(--font-sans); 
  font-size: var(--text-lg); 
  font-weight: var(--font-semibold); 
  color: var(--color-text-primary); 
  letter-spacing: -0.025em; 
}
.logo-wordmark b { color: inherit; font-weight: 700; }

.header-nav { display: flex; align-items: center; gap: 2px; flex: 1; }

.nav-link { 
  font-size: var(--text-sm); 
  font-weight: var(--font-medium); 
  color: var(--color-text-secondary); 
  padding: 6px 11px; 
  border-radius: var(--radius-sm); 
  transition: color var(--transition-fast), background var(--transition-fast); 
  white-space: nowrap; 
  text-decoration: none; 
}
.nav-link:hover { 
  color: var(--color-text-primary); 
  background: var(--color-bg-secondary); 
  text-decoration: none; 
}

.nav-count { 
  display: inline-flex; 
  align-items: center; 
  font-size: 0.65rem; 
  font-weight: var(--font-semibold); 
  color: var(--color-text-muted); 
  background: var(--color-bg-tertiary); 
  border-radius: var(--radius-full); 
  padding: 1px 6px; 
  margin-left: 4px; 
  vertical-align: middle; 
}

.header-actions { display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0; }

.header-search-btn { 
  display: flex; 
  align-items: center; 
  gap: 8px; 
  font-size: var(--text-sm); 
  font-weight: var(--font-medium); 
  color: var(--color-text-muted); 
  background: var(--color-bg-secondary); 
  border: 1px solid var(--color-border); 
  border-radius: var(--radius-md); 
  padding: 7px 12px; 
  transition: all var(--transition-fast); 
  white-space: nowrap; 
  cursor: pointer; 
}
.header-search-btn:hover { color: var(--color-text-primary); border-color: var(--color-text-secondary); }
.header-search-btn kbd { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-muted); background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 4px; padding: 1px 5px; }

/* Mobile Menu */
.mobile-btn { display: none; flex-direction: column; gap: 5px; padding: 8px; color: var(--color-text-primary); border-radius: var(--radius-sm); transition: background var(--transition-fast); background: transparent; border: none; cursor: pointer; }
.mobile-btn:hover { background: var(--color-bg-secondary); }
.mobile-btn span { display: block; width: 20px; height: 1.5px; background: currentColor; border-radius: 2px; transform-origin: center; transition: transform var(--transition-normal), opacity var(--transition-normal); }
body.nav-open .mobile-btn span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
body.nav-open .mobile-btn span:nth-child(2) { opacity: 0; transform: scaleX(0); }
body.nav-open .mobile-btn span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-nav { display: none; position: fixed; top: var(--header-h); left: 0; right: 0; background: var(--color-bg); border-bottom: 1px solid var(--color-border); padding: var(--space-4) var(--space-6) var(--space-6); flex-direction: column; gap: 2px; z-index: 190; box-shadow: var(--shadow-lg); }
body.nav-open .mobile-nav { display: flex; }
.mobile-nav-link { display: flex; align-items: center; justify-content: space-between; font-size: var(--text-base); font-weight: var(--font-medium); color: var(--color-text-secondary); padding: 10px 12px; border-radius: var(--radius-md); transition: all var(--transition-fast); text-decoration: none; }
.mobile-nav-link:hover { color: var(--color-text-primary); background: var(--color-bg-secondary); text-decoration: none; }
.mobile-nav-divider { height: 1px; background: var(--color-border); margin: 8px 0; }

/* Footer */
#footer { background: var(--color-primary); color: rgba(255, 255, 255, 0.6); padding: var(--space-16) 0 0; margin-top: var(--space-10); }
.footer-grid { display: grid; grid-template-columns: 260px 1fr; gap: var(--space-16); padding-bottom: var(--space-12); border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.footer-logo { display: flex; align-items: center; gap: 9px; margin-bottom: var(--space-4); }
.footer-logo-wordmark { font-family: var(--font-sans); font-size: var(--text-lg); font-weight: var(--font-semibold); color: #fff; letter-spacing: -0.025em; }
.footer-logo-wordmark b { color: inherit; }
.footer-tagline { font-size: var(--text-sm); line-height: 1.65; margin-bottom: var(--space-4); color: rgba(255, 255, 255, 0.6); }
.footer-meta { font-size: var(--text-xs); font-weight: var(--font-semibold); letter-spacing: 0.03em; color: rgba(255, 255, 255, 0.3); }
.footer-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-8); }
.footer-col-title { font-size: 0.7rem; font-weight: var(--font-semibold); text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255, 255, 255, 0.4); margin-bottom: var(--space-4); }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: var(--text-sm); color: rgba(255, 255, 255, 0.6); transition: color var(--transition-fast); text-decoration: none; }
.footer-links a:hover { color: #fff; text-decoration: none; }
.footer-all-link { font-weight: var(--font-semibold); color: rgba(255, 255, 255, 0.4) !important; margin-top: var(--space-1); }
.footer-all-link:hover { color: rgba(255, 255, 255, 0.8) !important; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding: var(--space-5) 0; flex-wrap: wrap; gap: var(--space-4); }
.footer-copy { font-size: var(--text-sm); color: rgba(255, 255, 255, 0.4); }
.footer-legal { display: flex; gap: var(--space-6); }
.footer-legal a { font-size: var(--text-sm); color: rgba(255, 255, 255, 0.4); transition: color var(--transition-fast); text-decoration: none; }
.footer-legal a:hover { color: rgba(255, 255, 255, 0.8); text-decoration: none; }

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-10); }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .header-nav, .header-search-btn { display: none; }
  .mobile-btn { display: flex; }
}
@media (max-width: 640px) {
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ── LAYOUT ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.tool-wrapper {
  max-width: var(--max-width-tool);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.content-wrapper {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

/* ── BREADCRUMB ──────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.breadcrumb-sep {
  color: var(--color-border);
  font-size: var(--text-xs);
  user-select: none;
}

.breadcrumb-current {
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
}

/* ── TYPOGRAPHY ──────────────────────────────────────────── */
.tool-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-semibold);
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.tool-description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-8);
  max-width: 56ch;
}

.section-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

/* ── TOOL CARD ───────────────────────────────────────────── */
.tool-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-md);
}

/* ── FORM ELEMENTS ───────────────────────────────────────── */
.field {
  margin-bottom: var(--space-5);
  min-width: 0; /* Add this line to stop grid blowouts */
}

.field-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  gap: var(--space-2);
}

.field-label-text { flex: 1; }

.field-unit {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: var(--font-normal);
}

.field-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.field-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
  display: none;
}

.field.has-error .field-error { display: block; }
.field.has-error .input { border-color: var(--color-error); }
.field.has-error .input:focus { box-shadow: 0 0 0 3px rgba(220,53,69,0.15); }

/* Input wrapper */
.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix,
.input-suffix {
  position: absolute;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  pointer-events: none;
  user-select: none;
}

.input-prefix { left: var(--space-3); }
.input-suffix { right: var(--space-3); }
.input-wrapper.has-prefix .input { padding-left: var(--space-8); }
.input-wrapper.has-suffix .input { padding-right: var(--space-8); }

/* The input itself */
.input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.input:hover { border-color: #c5cad3; }

.input:focus {
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
}

.input::placeholder { color: var(--color-text-muted); font-weight: var(--font-normal); }

.input[type="number"]::-webkit-inner-spin-button,
.input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
.input[type="number"] { appearance: none;
  -moz-appearance: textfield; }

/* Select */
.select {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-10) 0 var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  background: var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23767676' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") no-repeat right 12px center;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.select:hover { border-color: #c5cad3; }
.select:focus { border-color: var(--color-border-focus); box-shadow: var(--shadow-focus); }

/* Input grid */
.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-4);
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 48px;
  padding: 0 var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  appearance:none;
  -webkit-appearance: none;
  outline: none;
}

.btn:focus-visible { box-shadow: var(--shadow-focus); }

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  text-decoration: none;
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: transparent;
  padding: 0 var(--space-2);
  height: auto;
}

.btn-ghost:hover {
  background: var(--color-accent-light);
  text-decoration: none;
}

.btn-sm {
  height: 36px;
  padding: 0 var(--space-4);
  font-size: var(--text-sm);
}

.btn-full { width: 100%; }

.btn-row {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* ── RESULT DISPLAY ──────────────────────────────────────── */
.result-section {
  background: var(--color-result-bg);
  border: 1.5px solid rgba(15,122,255,0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-top: var(--space-6);
  display: none;
}

.result-section.visible { display: block; }

.result-section.error-state {
  background: var(--color-error-bg);
  border-color: rgba(220,53,69,0.2);
}

.result-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.result-section.error-state .result-label { color: var(--color-error); }

.result-primary {
  font-size: var(--text-4xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-1);
}

.result-unit {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: var(--font-normal);
  margin-left: var(--space-2);
}

.result-secondary {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
}

.result-breakdown {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(15,122,255,0.1);
}

.result-item-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-item-value {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
}

.result-item-unit {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: var(--font-normal);
}

.result-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

/* ── DIVIDER ─────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-10) 0;
}

/* ── HOW TO USE ──────────────────────────────────────────── */
.how-to-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.how-to-step {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.step-number {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-title {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.step-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ── FAQ ─────────────────────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-4);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  background: var(--color-bg);
  border: none;
  cursor: pointer;
  text-align: left;
  gap: var(--space-4);
  transition: background var(--transition-fast);
}

.faq-question:hover { background: var(--color-bg-secondary); }
.faq-question[aria-expanded="true"] { background: var(--color-bg-secondary); }

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
  color: var(--color-text-muted);
}

.faq-question[aria-expanded="true"] .faq-icon { transform: rotate(180deg); }

.faq-answer {
  display: none;
  padding: 0 var(--space-5) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--color-border);
}

.faq-answer.open { display: block; }

/* ── ABOUT SECTION ───────────────────────────────────────── */
.about-section {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-top: var(--space-8);
}

.about-section p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.about-section p:last-child { margin-bottom: 0; }

.formula-block {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  margin: var(--space-4) 0;
  overflow-x: auto;
}

/* ── RELATED TOOLS ───────────────────────────────────────── */
.related-section { margin-top: var(--space-10); }

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.related-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  transform: translateY(-1px);
  text-decoration: none;
}

.related-card-title {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.related-card-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ── AD ZONES ────────────────────────────────────────────── */
.ad-zone {
  width: 100%;
  margin: var(--space-8) 0;
  min-height: 1px;
}

.ad-zone-header { margin: var(--space-6) 0; }
.ad-zone-mid { margin: var(--space-10) 0; }
.ad-zone-footer { margin: var(--space-8) 0; }

/* ── TOAST NOTIFICATION ──────────────────────────────────── */
.toast {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(8px);
  transition: all var(--transition-normal);
  pointer-events: none;
  z-index: 1000;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ── LOADING STATE ───────────────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-tertiary) 25%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 640px) {
  .tool-wrapper { padding: var(--space-6) var(--space-4); }
  .tool-card { padding: var(--space-5); border-radius: var(--radius-lg); }
  .tool-title { font-size: var(--text-2xl); }
  .result-primary { font-size: var(--text-3xl); }
  .input-grid { grid-template-columns: 1fr; }
  .btn-row { flex-direction: column; }
  .btn-row .btn { width: 100%; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .toast { left: var(--space-4); right: var(--space-4); }
  .about-section { padding: var(--space-5); }
}

@media (max-width: 380px) {
  .related-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════════════════
   SILO INDEX PAGES (/tools/business/, /tools/materials/,
   /tools/home/, /tools/trade/). Shared by all 4 — rendered
   by initSiloPage() in utils.js from tools-data.js.
══════════════════════════════════════════════════ */
.silo-wrapper {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
}

.silo-hero {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.silo-icon {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-lg);
}

.silo-hero-text { flex: 1; padding-top: 2px; }

.silo-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-semibold);
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.silo-description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.5;
  max-width: 60ch;
}

.silo-stats {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  margin: var(--space-6) 0 var(--space-10);
}

.cluster-section { margin-bottom: var(--space-10); }
.cluster-section:last-child { margin-bottom: 0; }

.cluster-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.cluster-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.cluster-count {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  padding: 3px 10px;
  white-space: nowrap;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}

/* ─────────────────────────────────────────────────────────
   TOOL LISTING CARDS (Matches Homepage Silo Cards)
───────────────────────────────────────────────────────── */
.tool-listing-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  overflow: hidden;
}

/* Permanent Top Line */
.tool-listing-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 6px; 
}

/* Hover State */
.tool-listing-card:hover {
  border-color: #c8c5be;
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  text-decoration: none;
}

/* Silo Theme Colors */
.tool-listing-card.silo-business::before { background: #1a4bff; }
.tool-listing-card.silo-materials::before { background: #c05e0b; }
.tool-listing-card.silo-home::before { background: #0a7a58; }
.tool-listing-card.silo-trade::before { background: #dc2626; }
/* Icon Box */
.tool-listing-card-icon-wrap {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.tool-listing-card.silo-business .tool-listing-card-icon-wrap { background: #eef2ff; color: #1a4bff; }
.tool-listing-card.silo-materials .tool-listing-card-icon-wrap { background: #fff3e8; color: #c05e0b; }
.tool-listing-card.silo-home .tool-listing-card-icon-wrap { background: #e6f5f0; color: #0a7a58; }
.tool-listing-card.silo-trade .tool-listing-card-icon-wrap { background: #fef2f2; color: #dc2626; }
/* Text Content */
.tool-listing-card-content { 
  flex: 1; 
}
.tool-listing-card-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}
.tool-listing-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* Footer & Arrow */
.tool-listing-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.tool-listing-silo-label {
  font-size: 0.8125rem;
  font-weight: var(--font-semibold);
  color: var(--color-text-secondary);
}
.tool-listing-arrow {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.tool-listing-card:hover .tool-listing-arrow {
  border-color: var(--color-text-primary);
  color: var(--color-text-primary);
  transform: translateX(2px);
}

.cluster-empty {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
  padding: var(--space-5);
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-align: center;
}

@media (max-width: 640px) {
  .silo-wrapper { padding: var(--space-6) var(--space-4) var(--space-12); }
  .silo-hero { gap: var(--space-3); }
  .silo-icon { width: 44px; height: 44px; }
  .silo-title { font-size: var(--text-2xl); }
  .silo-stats { margin: var(--space-5) 0 var(--space-8); }
  .tool-grid { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════════════════
   TOOLS DIRECTORY PAGE (/tools/).
══════════════════════════════════════════════════ */
.tools-hero { margin-bottom: 0; }
.tools-hero .silo-title { margin-bottom: var(--space-2); }

.tools-search {
  position: relative;
  margin: var(--space-6) 0 var(--space-10);
}

.search-input-wrapper { position: relative; }

.search-input-wrapper svg {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.search-input-wrapper .input {
  height: 52px;
  padding-left: 44px;
  font-size: var(--text-base);
}

.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 360px;
  overflow-y: auto;
  z-index: 50;
}

.search-results.visible { display: block; }

.search-result-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--color-bg-secondary); text-decoration: none; }

.search-result-name {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
}

.search-result-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.search-result-empty {
  padding: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
}

.silo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.silo-card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.silo-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.silo-card-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-md);
}

.silo-card-body { flex: 1; }

.silo-card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.silo-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-2);
}

.silo-card-count {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .silo-grid { grid-template-columns: 1fr; }
  .silo-card { padding: var(--space-5); }
  .search-input-wrapper .input { height: 48px; }
}

/* ── ACCESSIBILITY ───────────────────────────────────────── */
.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;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ══════════════════════════════════════════════════
   REUSABLE INTERACTIVE COMPONENTS
══════════════════════════════════════════════════ */

/* ── SLIDER + NUMBER SYNC ─────────────────────────── */
.slider-sync {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.range-input {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  outline: none;
  cursor: pointer;
}

.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-fast);
}
.range-input::-webkit-slider-thumb:hover { transform: scale(1.1); }

.range-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-fast);
}
.range-input::-moz-range-thumb:hover { transform: scale(1.1); }

.range-input::-moz-range-track {
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
}

.range-input:focus-visible { box-shadow: var(--shadow-focus); border-radius: var(--radius-full); }

.range-number {
  width: 84px;
  flex-shrink: 0;
  text-align: center;
  padding: 0 var(--space-2);
}

@media (max-width: 640px) {
  .slider-sync { gap: var(--space-3); }
  .range-number { width: 72px; }
}

/* ── LIVE COMPARISON / BAR CHART ──────────────────── */
.compare-chart {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.compare-chart-row {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  align-items: center;
  gap: var(--space-3);
}

.compare-chart-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.compare-chart-track {
  height: 12px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  overflow: hidden;
}

.compare-chart-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  transition: width var(--transition-normal);
}

.compare-chart-value {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
  text-align: right;
}

.compare-chart-unit {
  font-size: var(--text-xs);
  font-weight: var(--font-normal);
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .compare-chart-row { grid-template-columns: 72px 1fr auto; gap: var(--space-2); }
  .compare-chart-label { font-size: var(--text-xs); }
}

/* ── +/- NUMBER STEPPER ────────────────────────────── */
.stepper {
  display: flex;
  align-items: stretch;
  width: 100%;
  height: 48px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.stepper:focus-within {
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
}

.stepper-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  flex-shrink: 0;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.stepper-btn:hover:not(:disabled) { background: var(--color-bg-tertiary); color: var(--color-text-primary); }
.stepper-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.stepper-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: -2px; }

.stepper .stepper-input {
  flex: 1;
  min-width: 0;
  height: 100%;
  border: none;
  border-left: 1.5px solid var(--color-border);
  border-right: 1.5px solid var(--color-border);
  border-radius: 0;
  text-align: center;
}
.stepper .stepper-input:focus { box-shadow: none; }

@media (max-width: 640px) {
  .stepper-btn { width: 40px; }
}

/* ── LIVE DIMENSION DIAGRAM ────────────────────────── */
.dim-diagram {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.dim-diagram-svg {
  width: 100%;
  height: auto;
  display: block;
}

.dim-diagram-svg .dim-diagram-line {
  stroke: var(--color-text-muted);
  stroke-width: 1;
}

.dim-diagram-svg .dim-diagram-label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: var(--font-medium);
  fill: var(--color-text-secondary);
}

@media (max-width: 640px) {
  .dim-diagram { padding: var(--space-3); }
}

/* ── SEGMENTED CONTROL / UNIT TOGGLE ──────────────── */
/* ── SEGMENTED CONTROL / UNIT TOGGLE ──────────────── */
/* ── SEGMENTED CONTROL / UNIT TOGGLE ──────────────── */
.segmented {
  display: flex;
  flex-wrap: wrap; /* Allows buttons to wrap into rows on mobile */
  width: 100%;
  max-width: 100%;
  padding: 3px;
  gap: 2px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-lg); /* Slightly softer radius for multi-row */
}

.segmented-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 45%; /* Forces roughly 2 buttons per row on small screens */
  padding: 8px var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.segmented-btn:hover { color: var(--color-text-primary); }

.segmented-btn.is-active {
  background: var(--color-bg);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

/* EFFICIENCO: PROBLEM REPORT CTA START */
.problem-report-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-10);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.problem-report-title {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  margin: 0;
}

.problem-report-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin: 2px 0 0;
}

.problem-report-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.problem-report-gmail {
  flex-shrink: 0;
}

.problem-report-email-app {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.problem-report-email-app:hover {
  color: var(--color-accent);
}

@media (max-width: 640px) {
  .problem-report-cta {
    align-items: flex-start;
    flex-direction: column;
  }

  .problem-report-actions {
    align-items: flex-start;
    flex-direction: column;
  }
}
/* EFFICIENCO: PROBLEM REPORT CTA END */