/* ===== QuickMath - Complete Premium Design System ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-darker: #1e40af;
  --primary-light: #dbeafe;
  --primary-lighter: #eff6ff;
  --accent: #7c3aed;
  --accent-light: #ede9fe;
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a5f 30%, #2563eb 60%, #7c3aed 100%);
  --gradient-hero-alt: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #7c3aed 100%);
  --gradient-accent: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --gradient-cool: linear-gradient(135deg, #06b6d4 0%, #2563eb 100%);
  --gradient-section: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 40%, var(--gray-50) 100%);
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --success: #10b981;
  --success-bg: #d1fae5;
  --success-text: #065f46;
  --warning: #f59e0b;
  --warning-bg: #fef3c7;
  --warning-text: #92400e;
  --danger: #ef4444;
  --danger-bg: #fee2e2;
  --danger-text: #991b1b;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.04);
  --shadow-glow: 0 0 25px rgba(37,99,235,0.2);
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --max-width: 1200px;
  --nav-height: 72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image: radial-gradient(ellipse at 20% 50%, rgba(37,99,235,0.03) 0%, transparent 50%), radial-gradient(ellipse at 80% 20%, rgba(124,58,237,0.03) 0%, transparent 50%);
  background-attachment: fixed;
}

::selection { background: var(--primary); color: var(--white); }

/* ===== Navigation ===== */
.navbar {
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226,232,240,0.5);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow 0.3s, background 0.3s;
}

.navbar.scrolled { box-shadow: 0 1px 8px rgba(0,0,0,0.06); background: rgba(255,255,255,0.95); }

.navbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.5px;
  position: relative;
}

.navbar .logo span { color: var(--gray-900); font-weight: 300; }

.navbar .logo::before {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gradient-accent);
  margin-right: 6px;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.85); }
}

.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }

.nav-links a {
  text-decoration: none;
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 10px;
  transition: all 0.2s;
  white-space: nowrap;
}

.nav-links a:hover { color: var(--primary); background: var(--primary-lighter); }

.nav-links a.active {
  color: var(--primary);
  background: var(--primary-lighter);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-700);
  padding: 8px;
  border-radius: 10px;
  transition: background 0.2s;
}

.nav-toggle:hover { background: var(--gray-100); }
.nav-toggle svg { display: block; }

/* ===== Container ===== */
main { flex: 1; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Hero Section ===== */
.hero {
  background: var(--gradient-hero);
  color: var(--white);
  padding: 120px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -60%;
  left: -20%;
  width: 140%;
  height: 180%;
  background: radial-gradient(ellipse at 30% 50%, rgba(37,99,235,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 80%;
  height: 120%;
  background: radial-gradient(ellipse at center, rgba(124,58,237,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  margin-bottom: 28px;
}

.hero-badge span {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  margin-right: 2px;
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 20px;
  line-height: 1.1;
  letter-spacing: -1.5px;
  background: linear-gradient(135deg, #fff 50%, rgba(255,255,255,0.65));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.8;
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
  font-weight: 400;
}

.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Section Styles ===== */
.section { padding: 100px 0; }
.section-alt { background: var(--white); }

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--gray-900);
  letter-spacing: -1px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: var(--white);
  padding: 16px 32px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
  border: none;
  cursor: pointer;
  text-align: center;
  letter-spacing: 0.2px;
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn:active { transform: translateY(0); }
.btn-block { width: 100%; }

.btn-outline {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.3);
  color: var(--white);
}

.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.6); box-shadow: none; }

.btn-lg { padding: 18px 40px; font-size: 1rem; border-radius: 14px; }
.btn-sm { padding: 10px 20px; font-size: 0.82rem; border-radius: 8px; }

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  border: 2px solid var(--gray-200);
}

.btn-ghost:hover { background: var(--gray-50); border-color: var(--gray-300); box-shadow: none; transform: none; }

/* ===== Cards Grid ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  box-shadow: var(--shadow);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(226,232,240,0.5);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity 0.35s;
}

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

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-lighter);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  transition: all 0.35s;
}

.card:hover .card-icon { transform: scale(1.08) rotate(-4deg); background: var(--primary-light); }

.card .tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 14px;
  align-self: flex-start;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--gray-900);
  line-height: 1.35;
}

.card p {
  color: var(--gray-500);
  font-size: 0.93rem;
  line-height: 1.7;
  margin-bottom: 24px;
  flex: 1;
}

.card .features-list {
  list-style: none;
  margin-bottom: 24px;
}

.card .features-list li {
  padding: 6px 0;
  font-size: 0.88rem;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card .features-list li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===== Features Grid ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-200);
  transition: all 0.3s;
}

.feature-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow-md); transform: translateY(-2px); }

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.feature-icon.blue { background: var(--primary-lighter); }
.feature-icon.purple { background: var(--accent-light); }
.feature-icon.green { background: #d1fae5; }
.feature-icon.orange { background: #fef3c7; }
.feature-icon.teal { background: #ccfbf1; }
.feature-icon.pink { background: #fce7f3; }

.feature-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===== How It Works ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  counter-reset: step;
}

.step-card {
  text-align: center;
  padding: 40px 28px;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-lighter);
  color: var(--primary);
  font-size: 1.4rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  position: relative;
}

.step-card:not(:last-child) .step-number::after {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(50% + 40px);
  width: calc(100% - 80px);
  height: 2px;
  background: var(--gray-200);
  z-index: -1;
}

.step-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--gray-900);
}

.step-card p { font-size: 0.9rem; color: var(--gray-500); line-height: 1.7; }

/* ===== Testimonials ===== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-200);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 24px;
  font-size: 4rem;
  font-weight: 900;
  color: var(--gray-100);
  line-height: 1;
  font-family: Georgia, serif;
}

.testimonial-stars { color: #f59e0b; font-size: 0.9rem; margin-bottom: 14px; letter-spacing: 2px; }

.testimonial-text {
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.75;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author { display: flex; align-items: center; gap: 12px; }

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 0.85rem;
}

.testimonial-name { font-size: 0.9rem; font-weight: 600; color: var(--gray-800); }
.testimonial-role { font-size: 0.8rem; color: var(--gray-400); }

/* ===== Comparison Table Section ===== */
.comparison-section { padding: 100px 0; background: var(--white); }

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
  font-size: 0.92rem;
}

.comparison-table thead th {
  background: var(--gray-900);
  color: var(--white);
  padding: 18px 20px;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.3px;
  text-align: left;
  border-bottom: none;
}

.comparison-table thead th:first-child { border-radius: 0; }
.comparison-table thead th:last-child { border-radius: 0; }

.comparison-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-600);
}

.comparison-table tr:last-child td { border-bottom: none; }

.comparison-table tbody tr:hover { background: var(--gray-50); }

.comparison-table .check { color: var(--success); font-weight: 700; }
.comparison-table .cross { color: var(--danger); }
.comparison-table .highlight { background: var(--primary-lighter); }
.comparison-table .highlight td { color: var(--gray-800); font-weight: 500; }

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  background: var(--gradient-hero-alt);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(255,255,255,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 { font-size: 2.2rem; font-weight: 800; margin-bottom: 14px; letter-spacing: -0.5px; }
.cta-section p { opacity: 0.8; margin-bottom: 32px; font-size: 1.1rem; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ===== Stats Section ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 800px;
  margin: 0 auto;
}

.stat-item { text-align: center; padding: 0 20px; }

.stat-number {
  font-size: 3rem;
  font-weight: 900;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -1.5px;
}

.stat-label { color: var(--gray-500); font-size: 0.9rem; font-weight: 500; }

/* ===== FAQ Section (Home) ===== */
.faq-section {
  padding: 100px 0;
  background: var(--white);
}

.faq-container {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.25s;
}

.faq-item:hover { border-color: var(--primary-light); }

.faq-question {
  width: 100%;
  background: transparent;
  padding: 22px 28px;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-800);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
  gap: 16px;
  font-family: inherit;
}

.faq-question:hover { background: rgba(0,0,0,0.02); }

.faq-question .arrow {
  transition: transform 0.35s ease;
  font-size: 0.75rem;
  color: var(--gray-400);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--gray-200);
}

.faq-item.active .faq-question .arrow {
  transform: rotate(180deg);
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 28px;
}

.faq-item.active .faq-answer { max-height: 500px; padding: 0 28px 22px; }

.faq-answer p {
  color: var(--gray-600);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ===== Calculator Pages ===== */
.page-hero {
  background: var(--gradient-hero-alt);
  color: var(--white);
  padding: 72px 0 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -15%;
  width: 50%;
  height: 100%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.page-hero h1 { font-size: 2.6rem; font-weight: 800; margin-bottom: 12px; letter-spacing: -0.5px; position: relative; }
.page-hero p { font-size: 1.1rem; opacity: 0.85; max-width: 600px; margin: 0 auto; position: relative; }

.calculator-section { padding: 48px 0 64px; }

.calculator-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }

.calculator-form {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226,232,240,0.5);
}

.form-group { margin-bottom: 22px; }

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray-700);
  margin-bottom: 7px;
}

.form-group input, .form-group select {
  width: 100%;
  padding: 14px 18px;
  font-size: 1.05rem;
  font-family: inherit;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  outline: none;
  transition: all 0.2s;
  background: var(--white);
  color: var(--gray-900);
}

.form-group input:focus, .form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37,99,235,0.08);
}

.form-group input:hover, .form-group select:hover { border-color: var(--gray-300); }

.help-text { font-size: 0.82rem; color: var(--gray-400); margin-top: 5px; }

/* ===== Results Panel ===== */
.result-panel {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  border: 1px solid rgba(226,232,240,0.5);
}

.result-panel h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 10px;
}

.result-panel h3::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
}

.result-item { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--gray-100); }
.result-item:last-child { border-bottom: none; }

.result-label { font-size: 0.88rem; color: var(--gray-500); }
.result-value { font-size: 1.25rem; font-weight: 700; color: var(--primary); }
.result-value.large { font-size: 1.75rem; }
.result-value.success { color: var(--success); }
.result-value.warning { color: var(--warning); }
.result-value.danger { color: var(--danger); }

.status-badge {
  display: inline-block;
  padding: 6px 24px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.3px;
}

.status-safe { background: var(--success-bg); color: var(--success-text); }
.status-critical { background: var(--warning-bg); color: var(--warning-text); }
.status-danger { background: var(--danger-bg); color: var(--danger-text); }

/* ===== Guide Section ===== */
.guide-section { padding: 80px 0; background: var(--white); border-top: 1px solid var(--gray-100); }
.guide-content { max-width: 800px; margin: 0 auto; }

.guide-content h2 { font-size: 2rem; font-weight: 800; margin-bottom: 20px; letter-spacing: -0.5px; }
.guide-content h3 { font-size: 1.35rem; font-weight: 700; margin-top: 40px; margin-bottom: 16px; color: var(--gray-800); }
.guide-content p { color: var(--gray-600); line-height: 1.85; margin-bottom: 18px; font-size: 1.02rem; }
.guide-content ul, .guide-content ol { color: var(--gray-600); line-height: 1.85; padding-left: 24px; margin-bottom: 18px; }
.guide-content li { margin-bottom: 8px; }

.guide-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.93rem;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  box-shadow: 0 0 0 1px var(--gray-200);
}

.guide-content th, .guide-content td { padding: 14px 18px; border: none; text-align: left; white-space: nowrap; border-bottom: 1px solid var(--gray-100); }

.guide-content th {
  background: var(--gray-50);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--gray-200);
}

.guide-content td { color: var(--gray-600); }
.guide-content tr:last-child td { border-bottom: none; }
.guide-content tr:hover td { background: var(--gray-50); }

.tip-box {
  background: linear-gradient(135deg, var(--primary-lighter), #f0f4ff);
  border: 1px solid rgba(37,99,235,0.1);
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  margin: 28px 0;
}

.tip-box p { margin-bottom: 0; color: var(--gray-700); font-size: 0.95rem; }

/* ===== About / Contact / Legal Pages ===== */
.legal-page { padding: 60px 0; }

.legal-content {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 52px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226,232,240,0.5);
}

.legal-content h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; letter-spacing: -0.5px; }
.legal-content .last-updated { color: var(--gray-400); font-size: 0.88rem; margin-bottom: 36px; }
.legal-content h2 { font-size: 1.4rem; font-weight: 700; margin-top: 40px; margin-bottom: 16px; color: var(--gray-800); }
.legal-content h3 { font-size: 1.15rem; font-weight: 600; margin-top: 28px; margin-bottom: 12px; color: var(--gray-800); }
.legal-content p { color: var(--gray-600); line-height: 1.85; margin-bottom: 16px; }
.legal-content ul, .legal-content ol { color: var(--gray-600); line-height: 1.85; padding-left: 24px; margin-bottom: 16px; }
.legal-content li { margin-bottom: 8px; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.93rem;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  box-shadow: 0 0 0 1px var(--gray-200);
}

.data-table th, .data-table td { padding: 14px 18px; border: none; text-align: left; white-space: nowrap; border-bottom: 1px solid var(--gray-100); }

.data-table th {
  background: var(--gray-50);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--gray-200);
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--gray-50); }

/* ===== Contact ===== */
.contact-info { display: flex; flex-direction: column; gap: 20px; padding: 24px 0; }

.contact-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 28px;
  background: linear-gradient(135deg, var(--gray-50), var(--white));
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
}

.contact-item .icon { font-size: 1.5rem; flex-shrink: 0; width: 50px; height: 50px; background: var(--primary-lighter); border-radius: 14px; display: flex; align-items: center; justify-content: center; }

.contact-item .label { font-size: 0.8rem; color: var(--gray-400); margin-bottom: 3px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.contact-item .value { font-size: 1.1rem; font-weight: 600; color: var(--primary); word-break: break-all; }

.about-story { font-size: 1.05rem; line-height: 2; }

.about-story .highlight-box {
  margin-top: 32px;
  padding: 28px 32px;
  background: linear-gradient(135deg, var(--primary-lighter), #f0f4ff);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(37,99,235,0.08);
}

.about-story .highlight-box p { margin-bottom: 0; font-style: italic; color: var(--gray-700); }

/* ===== Blog Listing ===== */
.blog-page { padding: 48px 0 64px; }

.blog-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(350px, 1fr)); gap: 28px; }

.blog-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  border: 1px solid rgba(226,232,240,0.5);
  display: flex;
  flex-direction: column;
}

.blog-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-xl); border-color: var(--primary-light); }
.blog-card-body { padding: 28px; flex: 1; display: flex; flex-direction: column; }

.blog-card .category { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; color: var(--primary); margin-bottom: 10px; }

.blog-card .category-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--primary); margin-right: 6px; vertical-align: middle; }

.blog-card h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; line-height: 1.4; }

.blog-card h2 a { color: var(--gray-900); text-decoration: none; transition: color 0.2s; }
.blog-card h2 a:hover { color: var(--primary); }

.blog-card p { color: var(--gray-500); font-size: 0.88rem; line-height: 1.65; margin-bottom: 14px; flex: 1; }

.blog-card .meta { font-size: 0.82rem; color: var(--gray-400); display: flex; align-items: center; gap: 8px; }
.blog-card .meta .sep { width: 3px; height: 3px; border-radius: 50%; background: var(--gray-300); }

.blog-article { padding: 40px 0 64px; }

.blog-article .article-content {
  max-width: 800px;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 52px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(226,232,240,0.5);
}

.blog-article h1 { font-size: 2.1rem; font-weight: 800; margin-bottom: 14px; line-height: 1.3; letter-spacing: -0.5px; }

.blog-article .article-meta { color: var(--gray-400); font-size: 0.88rem; margin-bottom: 36px; padding-bottom: 24px; border-bottom: 2px solid var(--gray-100); display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.blog-article .article-meta .sep { width: 4px; height: 4px; border-radius: 50%; background: var(--gray-300); }

.blog-article h2 { font-size: 1.55rem; font-weight: 700; margin-top: 40px; margin-bottom: 16px; letter-spacing: -0.3px; }
.blog-article h3 { font-size: 1.2rem; font-weight: 600; margin-top: 32px; margin-bottom: 12px; }
.blog-article p { color: var(--gray-600); line-height: 1.85; margin-bottom: 18px; font-size: 1.02rem; }
.blog-article ul, .blog-article ol { color: var(--gray-600); line-height: 1.85; padding-left: 24px; margin-bottom: 18px; }
.blog-article li { margin-bottom: 8px; }

.blog-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.93rem;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  box-shadow: 0 0 0 1px var(--gray-200);
}

.blog-article th, .blog-article td { padding: 14px 18px; border: none; text-align: left; white-space: nowrap; border-bottom: 1px solid var(--gray-100); }

.blog-article th {
  background: var(--gray-50);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--gray-200);
}

.blog-article tr:last-child td { border-bottom: none; }
.blog-article tr:hover td { background: var(--gray-50); }

/* ===== Footer ===== */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 64px 0 28px;
  margin-top: auto;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
}

.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }

.footer-brand .logo-footer { display: inline-flex; align-items: center; gap: 8px; font-size: 1.3rem; font-weight: 900; color: var(--white); margin-bottom: 14px; letter-spacing: -0.5px; }

.footer-brand .logo-footer::before { content: ''; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--gradient-accent); margin-right: 4px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.75; max-width: 300px; }

.footer-col h4 { color: var(--white); font-size: 0.9rem; font-weight: 700; margin-bottom: 20px; letter-spacing: 0.3px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 12px; }

.footer-col a { color: var(--gray-400); text-decoration: none; font-size: 0.88rem; transition: all 0.2s; }
.footer-col a:hover { color: var(--white); padding-left: 4px; }

.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 28px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; font-size: 0.82rem; }

.footer-social a { color: var(--gray-500); text-decoration: none; margin-left: 20px; font-size: 0.85rem; transition: color 0.2s; }
.footer-social a:hover { color: var(--white); }

/* ===== Breadcrumb ===== */
.breadcrumb { padding: 18px 0; font-size: 0.82rem; color: var(--gray-400); }
.breadcrumb a { color: var(--gray-500); text-decoration: none; transition: color 0.2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 10px; color: var(--gray-300); }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--gray-600);
  transition: all 0.3s;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  z-index: 50;
}

.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

.back-to-top:hover { background: var(--primary); color: var(--white); border-color: var(--primary); box-shadow: var(--shadow-glow); }

/* ===== Page Header ===== */
.page-header { padding: 48px 0 40px; text-align: center; }
.page-header h1 { font-size: 2rem; font-weight: 800; margin-bottom: 10px; letter-spacing: -0.5px; }
.page-header p { color: var(--gray-500); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ===== Responsive ===== */
@media (max-width: 1024px) { .footer-grid { gap: 32px; } }

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 12px 24px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
    gap: 2px;
  }

  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; font-size: 0.95rem; width: 100%; }
  .nav-toggle { display: block; }

  .hero { padding: 80px 0 64px; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
  .hero-badge { font-size: 0.7rem; }

  .section { padding: 64px 0; }
  .section-title { font-size: 1.7rem; }
  .section-header { margin-bottom: 40px; }

  .calculator-wrapper { grid-template-columns: 1fr; }
  .result-panel { position: static; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }

  .legal-content, .blog-article .article-content { padding: 28px 20px; border-radius: var(--radius-lg); }

  .tools-grid, .features-grid, .testimonials-grid, .blog-list { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; gap: 24px; }
  .steps-grid { grid-template-columns: 1fr; gap: 24px; }

  .step-card:not(:last-child) .step-number::after { display: none; }

  .page-hero { padding: 48px 0 40px; }
  .page-hero h1 { font-size: 1.8rem; }

  .card { padding: 28px; }
  .section-title { font-size: 1.5rem; }

  .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; }

  .cta-section h2 { font-size: 1.7rem; }

  .comparison-table { font-size: 0.78rem; }
  .comparison-table th, .comparison-table td { padding: 12px 14px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .navbar-inner { padding: 0 16px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .footer-social a { margin: 0 10px; }
  .hero h1 { font-size: 1.8rem; }
  .legal-content, .blog-article .article-content { padding: 20px 16px; }
  .calculator-form, .result-panel { padding: 24px 20px; }
}

/* ===== Print ===== */
@media print { .navbar, .footer, .back-to-top { display: none; } .result-panel { position: static; box-shadow: none; border: 1px solid var(--gray-200); } }

/* ===== Animations ===== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
.animate-in { animation: fadeInUp 0.6s ease forwards; }
.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }
.animate-in-delay-4 { animation-delay: 0.4s; }
.animate-in-delay-5 { animation-delay: 0.5s; }