/* ================================================
   TIODR - Professional Online Tools Platform
   style.css - Main Stylesheet
   ================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=DM+Mono:wght@400;500&display=swap');

/* ── CSS Variables ── */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --primary-hover: #1665d8;
  --secondary: #0d47a1;
  --accent: #00b4d8;
  --success: #34a853;
  --warning: #fbbc04;
  --error: #ea4335;

  --bg: #ffffff;
  --bg-secondary: #f8faff;
  --bg-tertiary: #f0f4fd;
  --surface: #ffffff;
  --surface-hover: #f0f4fd;

  --text-primary: #1a1f36;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --text-light: #a0aec0;

  --border: #e2e8f0;
  --border-focus: #1a73e8;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(26,115,232,.08), 0 2px 8px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 40px rgba(26,115,232,.12), 0 4px 16px rgba(0,0,0,.08);
  --shadow-xl: 0 20px 60px rgba(26,115,232,.16), 0 8px 24px rgba(0,0,0,.1);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'DM Mono', 'Courier New', monospace;

  --transition: all .2s cubic-bezier(.4,0,.2,1);
  --transition-slow: all .4s cubic-bezier(.4,0,.2,1);

  --header-h: 68px;
  --max-w: 1280px;
}

/* ── 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(--font-main);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
button { cursor: pointer; font-family: var(--font-main); border: none; outline: none; }
input, select, textarea { font-family: var(--font-main); }
ul, ol { list-style: none; }

/* ── Utilities ── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.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; }

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 32px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: #fff;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(26,115,232,.3);
}

.logo-text {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -.5px;
}

.logo-text span { color: var(--primary); }

/* Nav */
.main-nav { display: flex; align-items: center; gap: 4px; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-link .nav-icon { font-size: 1rem; }

/* Dropdown */
.nav-dropdown { position: relative; }

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  background: none;
}

.dropdown-toggle:hover { background: var(--primary-light); color: var(--primary); }

.dropdown-toggle .chevron {
  font-size: .75rem;
  transition: transform .2s;
}

.nav-dropdown:hover .chevron { transform: rotate(180deg); }

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  pointer-events: none;
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.dropdown-item:hover { background: var(--primary-light); color: var(--primary); }
.dropdown-item .di-icon { font-size: 1.1rem; width: 20px; text-align: center; }

/* CTA Button */
.btn-cta {
  padding: 9px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: .875rem;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(26,115,232,.3);
}

.btn-cta:hover {
  background: var(--primary-dark);
  color: #fff;
  box-shadow: 0 4px 16px rgba(26,115,232,.4);
  transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.menu-toggle:hover { background: var(--bg-secondary); }

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  padding: 16px;
  z-index: 999;
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  animation: slideDown .25s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.mobile-nav.open { display: block; }

.mobile-nav-links { display: flex; flex-direction: column; gap: 4px; }

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: .9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.mobile-nav-divider { height: 1px; background: var(--border); margin: 8px 0; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: .9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(26,115,232,.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  box-shadow: 0 6px 20px rgba(26,115,232,.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}

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

.btn-ghost:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: var(--radius-lg); }
.btn-sm { padding: 8px 16px; font-size: .8125rem; border-radius: var(--radius-sm); }
.btn-full { width: 100%; }

/* ── Hero Section ── */
.hero {
  background: linear-gradient(145deg, #f0f4ff 0%, #e8f0fe 40%, #f8fbff 100%);
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(26,115,232,.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -80px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,180,216,.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: .8125rem;
  font-weight: 600;
  margin-bottom: 20px;
  border: 1px solid rgba(26,115,232,.15);
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.5px;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero h1 .highlight {
  color: var(--primary);
  position: relative;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 500px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.stat-item { text-align: left; }
.stat-num { font-size: 1.5rem; font-weight: 800; color: var(--primary); letter-spacing: -.5px; }
.stat-label { font-size: .8125rem; color: var(--text-muted); font-weight: 500; }

/* Hero Visual */
.hero-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  position: relative;
}

.hero-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-decoration: none;
  color: var(--text-primary);
}

.hero-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
}

.hero-card:nth-child(1) { grid-column: span 2; }

.hero-card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.hero-card-title { font-size: .9375rem; font-weight: 700; margin-bottom: 4px; }
.hero-card-desc { font-size: .8125rem; color: var(--text-muted); line-height: 1.5; }

/* ── Section Headers ── */
.section-header { text-align: center; margin-bottom: 48px; }

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: .8125rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.625rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -.3px;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.25;
}

.section-header p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Tool Cards Grid ── */
.tools-section { padding: 80px 0; }
.tools-section.bg-alt { background: var(--bg-secondary); }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-decoration: none;
  color: var(--text-primary);
  display: block;
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(26,115,232,.2);
  color: var(--text-primary);
}

.tool-card:hover::before { opacity: 1; }

.tool-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.625rem;
  margin-bottom: 16px;
}

.icon-blue { background: #e8f0fe; color: #1a73e8; }
.icon-green { background: #e6f4ea; color: #34a853; }
.icon-orange { background: #fef3e2; color: #f9ab00; }
.icon-red { background: #fce8e6; color: #ea4335; }
.icon-purple { background: #f3e8fd; color: #9334ea; }

.tool-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.tool-card p {
  font-size: .875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.tool-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .875rem;
  font-weight: 600;
  color: var(--primary);
}

.tool-card-link::after { content: '→'; transition: transform .2s; }
.tool-card:hover .tool-card-link::after { transform: translateX(4px); }

/* ── Tool Page Layout ── */
.tool-page { padding: 60px 0 80px; }

.tool-page-inner {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  align-items: start;
}

.tool-main h1 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -.3px;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.2;
}

.tool-description {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

/* Calculator Card */
.calc-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.calc-card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Form Elements */
.form-group { margin-bottom: 20px; }

.form-label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-input, .form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: .9375rem;
  color: var(--text-primary);
  background: var(--bg);
  transition: var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,115,232,.15);
}

.form-select {
  background-image: 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='%23718096' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

/* Result Box */
.result-box {
  background: linear-gradient(135deg, var(--primary-light), rgba(0,180,216,.08));
  border: 1px solid rgba(26,115,232,.2);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 24px;
  display: none;
}

.result-box.show { display: block; animation: fadeInUp .3s ease; }

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-label {
  font-size: .8125rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 8px;
}

.result-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -.5px;
  font-family: var(--font-mono);
  line-height: 1.2;
}

.result-detail {
  font-size: .875rem;
  color: var(--text-secondary);
  margin-top: 8px;
  line-height: 1.6;
}

/* Result Grid */
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}

.result-item {
  background: rgba(255,255,255,.8);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}

.result-item-label { font-size: .75rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }
.result-item-value { font-size: 1.125rem; font-weight: 700; color: var(--text-primary); font-family: var(--font-mono); }

/* ── QR Generator ── */
.qr-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.qr-tab {
  flex: 1;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.qr-tab.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.qr-display {
  text-align: center;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-top: 20px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.qr-placeholder {
  color: var(--text-light);
  font-size: .9375rem;
  text-align: center;
}

.qr-placeholder .qr-icon { font-size: 3rem; margin-bottom: 8px; }

#qr-canvas {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* ── Sidebar ── */
.tool-sidebar { position: sticky; top: calc(var(--header-h) + 20px); }

.sidebar-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}

.sidebar-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-tools { display: flex; flex-direction: column; gap: 8px; }

.sidebar-tool {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  text-decoration: none;
}

.sidebar-tool:hover, .sidebar-tool.active {
  background: var(--primary-light);
  color: var(--primary);
}

.sidebar-tool .st-icon { font-size: 1rem; width: 20px; text-align: center; }

/* ── Benefits Section ── */
.benefits-section { padding: 80px 0; }

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.benefit-card {
  text-align: center;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.benefit-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.benefit-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto 16px;
}

.benefit-card h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 10px; }
.benefit-card p { font-size: .875rem; color: var(--text-secondary); line-height: 1.6; }

/* ── FAQ ── */
.faq-section { padding: 80px 0; background: var(--bg-secondary); }

.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.faq-item {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}

.faq-question:hover { background: var(--bg-secondary); }

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .875rem;
  flex-shrink: 0;
  transition: transform .25s;
}

.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all .3s ease;
}

.faq-item.open .faq-answer {
  padding: 0 24px 20px;
  max-height: 400px;
}

.faq-answer p {
  font-size: .9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ── Content Article ── */
.content-article { padding: 60px 0 80px; max-width: 900px; margin: 0 auto; }

.content-article h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--text-primary);
}

.content-article h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.content-article p {
  font-size: .9375rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.content-article ul, .content-article ol {
  list-style: disc;
  margin: 16px 0;
  padding-left: 24px;
}

.content-article li {
  font-size: .9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* ── Breadcrumb ── */
.breadcrumb {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb-item { font-size: .8125rem; color: var(--text-muted); }
.breadcrumb-item a { color: var(--primary); font-weight: 500; }
.breadcrumb-item a:hover { color: var(--primary-dark); }
.breadcrumb-sep { font-size: .75rem; color: var(--text-light); }
.breadcrumb-item.current { color: var(--text-secondary); font-weight: 500; }

/* ── Info Box ── */
.info-box {
  background: var(--primary-light);
  border: 1px solid rgba(26,115,232,.2);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 20px 0;
}

.info-icon { font-size: 1.125rem; flex-shrink: 0; margin-top: 2px; }
.info-text { font-size: .875rem; color: var(--text-secondary); line-height: 1.6; }
.info-text strong { color: var(--primary); }

/* ── Footer ── */
.site-footer {
  background: var(--text-primary);
  color: rgba(255,255,255,.7);
  padding: 60px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo-text { color: #fff; }
.footer-brand .logo-text span { color: var(--accent); }
.footer-brand p { font-size: .875rem; line-height: 1.7; margin-bottom: 20px; }

.footer-social { display: flex; gap: 10px; }

.social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .875rem;
  color: rgba(255,255,255,.8);
  text-decoration: none;
  transition: var(--transition);
}

.social-link:hover { background: var(--primary); color: #fff; }

.footer-col h4 {
  font-size: .9375rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-links { display: flex; flex-direction: column; gap: 10px; }

.footer-link {
  font-size: .875rem;
  color: rgba(255,255,255,.6);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-link:hover { color: #fff; }
.footer-link::before { content: '→'; font-size: .75rem; opacity: 0; transition: var(--transition); }
.footer-link:hover::before { opacity: 1; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom p { font-size: .8125rem; }
.footer-bottom a { color: rgba(255,255,255,.6); text-decoration: none; }
.footer-bottom a:hover { color: #fff; }
.footer-bottom-links { display: flex; gap: 20px; flex-wrap: wrap; }

/* ── Page Header ── */
.page-header {
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -.3px;
  line-height: 1.2;
}

.page-header p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 600px;
}

/* ── 404 Page ── */
.page-404 {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  text-align: center;
}

.error-number {
  font-size: clamp(6rem, 15vw, 10rem);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -.05em;
  margin-bottom: 16px;
}

.page-404 h1 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; margin-bottom: 12px; }
.page-404 p { font-size: 1.0625rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 480px; margin-left: auto; margin-right: auto; }

.error-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 56px; }

.error-tools h2 { font-size: 1.125rem; font-weight: 700; margin-bottom: 20px; }

.error-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
}

.error-tool-link {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.error-tool-link:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: rgba(26,115,232,.2);
}

/* ── Contact Form ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  align-items: start;
}

.contact-info h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; }
.contact-info p { font-size: .9375rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 24px; }

.contact-items { display: flex; flex-direction: column; gap: 16px; }

.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.ci-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.ci-text .ci-label { font-size: .75rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }
.ci-text .ci-value { font-size: .9375rem; color: var(--text-primary); font-weight: 500; }

.form-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

textarea.form-input {
  min-height: 120px;
  resize: vertical;
}

.form-success {
  background: #e6f4ea;
  border: 1px solid #a8d5b5;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: var(--success);
  font-weight: 600;
  display: none;
  margin-top: 16px;
}

/* ── About Page ── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 60px; }
.about-content h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 16px; }
.about-content p { font-size: .9375rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.value-card {
  padding: 24px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  text-align: center;
}

.value-card .vi { font-size: 1.75rem; margin-bottom: 12px; }
.value-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.value-card p { font-size: .875rem; color: var(--text-secondary); line-height: 1.6; }

/* ── Legal Pages ── */
.legal-content { max-width: 860px; }

.legal-content h2 { font-size: 1.375rem; font-weight: 700; margin: 36px 0 12px; color: var(--text-primary); }
.legal-content h3 { font-size: 1.0625rem; font-weight: 600; margin: 24px 0 10px; }
.legal-content p { font-size: .9375rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 14px; }
.legal-content ul { list-style: disc; padding-left: 24px; margin-bottom: 14px; }
.legal-content li { font-size: .9375rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 6px; }
.legal-content a { color: var(--primary); text-decoration: underline; }

.legal-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  font-size: .8125rem;
  font-weight: 600;
  margin-bottom: 24px;
}

/* ── AdSense Placeholder ── */
.ad-slot {
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  color: var(--text-light);
  font-size: .75rem;
  margin: 24px 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── CTA Banner ── */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff;
  text-align: center;
}

.cta-section h2 { font-size: clamp(1.625rem, 3vw, 2.25rem); font-weight: 800; margin-bottom: 12px; }
.cta-section p { font-size: 1.0625rem; margin-bottom: 32px; opacity: .9; max-width: 500px; margin-left: auto; margin-right: auto; }

.btn-white {
  background: #fff;
  color: var(--primary);
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); color: var(--primary); }

/* ── Responsive ── */
@media (max-width: 1100px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .tool-page-inner { grid-template-columns: 1fr; }
  .tool-sidebar { position: static; }
  .contact-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 60px; }
  .main-nav, .btn-cta { display: none; }
  .menu-toggle { display: flex; }
  .hero { padding: 48px 0 60px; }
  .tools-section, .benefits-section, .faq-section { padding: 56px 0; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .calc-card { padding: 24px; }
  .result-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .page-header { padding: 36px 0; }
  .error-number { font-size: 6rem; }
  .error-tools-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 1600px) {
  :root { --max-w: 1440px; }
}

/* ── Animations ── */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.floating { animation: float 4s ease-in-out infinite; }

/* ── Dark mode placeholder ── */
@media (prefers-color-scheme: dark) {
  /* Reserved for future dark mode */
}

/* ── Print ── */
@media print {
  .site-header, .site-footer, .breadcrumb, .ad-slot { display: none; }
}

/* Editorial pages */
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:44px;padding-top:38px;padding-bottom:76px;align-items:start}
.breadcrumbs{grid-column:1/-1;color:var(--text-muted);font-size:.85rem;margin-bottom:-22px}
.breadcrumbs a{color:var(--primary);text-decoration:none}
.article-content{max-width:820px;min-width:0}
.article-header{margin-bottom:28px}
.article-header h1{font-size:clamp(1.9rem,4vw,2.8rem);line-height:1.15;margin:12px 0;color:var(--text-primary)}
.article-category{display:inline-block;font-size:.78rem;font-weight:700;color:var(--primary);background:var(--primary-light);padding:6px 11px;border-radius:999px}
.article-meta,.blog-card-meta{color:var(--text-muted);font-size:.84rem}
.article-content p{color:var(--text-secondary);font-size:1rem;line-height:1.85;margin:0 0 18px}
.article-content .article-lead{font-size:1.12rem;color:var(--text-primary);line-height:1.8}
.article-content h2{font-size:1.45rem;margin:34px 0 14px;color:var(--text-primary)}
.article-content h3{font-size:1.08rem;margin:22px 0 8px;color:var(--text-primary)}
.article-sidebar{position:sticky;top:100px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);padding:22px;display:flex;flex-direction:column;gap:12px}
.article-sidebar h2{font-size:1.05rem;margin:0}
.article-sidebar p{color:var(--text-secondary);font-size:.9rem;line-height:1.6}
.article-sidebar a,.blog-read{color:var(--primary);font-weight:700;text-decoration:none}
.article-next{margin:36px 0;padding:26px;border-radius:var(--radius-xl);background:var(--bg-secondary);border:1px solid var(--border)}
.article-next h2{margin-top:0}
.article-note{font-size:.86rem!important;border-top:1px solid var(--border);padding-top:18px}
.blog-list-intro{margin-bottom:24px}
.blog-list-intro h2{font-size:1.7rem;margin-bottom:8px}
.blog-list-intro p{color:var(--text-secondary)}
.blog-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.blog-card{border:1px solid var(--border);border-radius:var(--radius-xl);background:var(--bg-primary);overflow:hidden}
.blog-card-content{padding:24px}
.blog-card h2{font-size:1.18rem;line-height:1.4;margin:14px 0 10px}
.blog-card h2 a{color:var(--text-primary);text-decoration:none}
.blog-card h2 a:hover{color:var(--primary)}
.blog-card p{color:var(--text-secondary);font-size:.94rem;line-height:1.7}
.blog-card-meta{margin:14px 0}
.blog-tools-callout{margin-top:34px;padding:28px;background:var(--bg-secondary);border-radius:var(--radius-xl)}
.blog-tools-callout p{color:var(--text-secondary)}
@media(max-width:800px){.article-wrap{grid-template-columns:1fr;gap:24px}.article-sidebar{position:static}.breadcrumbs{margin-bottom:0}.blog-cards{grid-template-columns:1fr}}

.qr-privacy-note{font-size:.86rem;line-height:1.6;color:var(--text-secondary);background:var(--bg-secondary);border-left:3px solid var(--primary);padding:12px 14px;border-radius:8px;margin:14px 0 18px}

.related-reading{padding:28px 0;background:var(--bg-secondary);border-top:1px solid var(--border)}.related-reading h2{font-size:1.2rem;margin:0 0 8px}.related-reading p{color:var(--text-secondary);margin:0 0 8px}.related-reading a{color:var(--primary);font-weight:700;text-decoration:none}