/* ============================================
   Speed Test Plus - Main Stylesheet
   Modern, Fast, SEO-Optimized Speed Test Site
   ============================================ */

/* CSS Custom Properties */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #818CF8;
  --secondary: #06B6D4;
  --secondary-dark: #0891B2;
  --accent: #F59E0B;
  --success: #10B981;
  --danger: #EF4444;
  --warning: #F59E0B;
  --dark: #0F172A;
  --dark-secondary: #1E293B;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --white: #FFFFFF;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 40px rgba(79,70,229,0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background: var(--dark);
  color: var(--gray-200);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--secondary);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--white);
  line-height: 1.3;
  font-weight: 700;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0 2rem;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--white);
  text-decoration: none;
}

.nav-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
}

.nav-logo .logo-plus {
  color: var(--secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--gray-400);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
  transition: var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--secondary)) !important;
  color: var(--white) !important;
  padding: 0.6rem 1.5rem !important;
  border-radius: var(--radius-full) !important;
  font-weight: 600 !important;
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
  background: none;
  border: none;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 2rem 60px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(79,70,229,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at bottom right, rgba(6,182,212,0.1) 0%, transparent 50%);
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(79,70,229,0.15);
  border: 1px solid rgba(79,70,229,0.3);
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--primary-light);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--gray-400);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

/* ============================================
   SPEED TEST WIDGET
   ============================================ */
.speed-test-card {
  background: var(--dark-secondary);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl);
  padding: 3rem;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.speed-test-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary));
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
}

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

/* Gauge / Speedometer */
.gauge-container {
  position: relative;
  width: 280px;
  height: 160px;
  margin: 0 auto 1.5rem;
}

.gauge-svg {
  width: 100%;
  height: 100%;
}

.gauge-bg {
  fill: none;
  stroke: rgba(255,255,255,0.06);
  stroke-width: 14;
  stroke-linecap: round;
}

.gauge-fill {
  fill: none;
  stroke: url(#gaugeGradient);
  stroke-width: 14;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 0.5s ease;
}

.gauge-value {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
}

.gauge-number {
  font-size: 3.5rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--white);
  line-height: 1;
}

.gauge-unit {
  font-size: 0.85rem;
  color: var(--gray-400);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.gauge-label {
  font-size: 0.8rem;
  color: var(--primary-light);
  font-weight: 600;
  margin-top: 4px;
}

/* Speed Test Button */
.start-test-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  font-size: 1.15rem;
  font-weight: 700;
  padding: 1rem 3rem;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
  font-family: var(--font-primary);
}

.start-test-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.start-test-btn:active {
  transform: translateY(0);
}

.start-test-btn.testing {
  background: linear-gradient(135deg, var(--secondary-dark), var(--secondary));
  pointer-events: none;
}

.start-test-btn .btn-pulse {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 2px solid var(--primary-light);
  animation: pulse-ring 2s infinite;
  opacity: 0;
}

.start-test-btn:not(.testing) .btn-pulse {
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.5; }
  100% { transform: scale(1.15); opacity: 0; }
}

/* Results Panel */
.results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.result-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 1.2rem 0.8rem;
  text-align: center;
  transition: var(--transition);
}

.result-item:hover {
  border-color: rgba(79,70,229,0.3);
  background: rgba(79,70,229,0.05);
}

.result-icon {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.result-value {
  font-size: 1.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--white);
}

.result-label {
  font-size: 0.75rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
  font-weight: 500;
}

/* Progress bar */
.test-progress {
  width: 100%;
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-full);
  margin-top: 1.5rem;
  overflow: hidden;
  opacity: 0;
  transition: var(--transition);
}

.test-progress.active {
  opacity: 1;
}

.test-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.3s ease;
}

.test-status {
  font-size: 0.85rem;
  color: var(--gray-400);
  margin-top: 0.8rem;
  min-height: 1.2em;
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.section {
  padding: 5rem 2rem;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary-light);
  margin-bottom: 0.8rem;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--gray-400);
  font-size: 1.05rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--dark-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79,70,229,0.3);
  box-shadow: var(--shadow-lg);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: var(--transition);
}

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

.feature-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.2rem;
  background: rgba(79,70,229,0.1);
  color: var(--primary-light);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.feature-card p {
  color: var(--gray-400);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   STATS BAR
   ============================================ */
.stats-bar {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 3rem 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 0.3rem;
}

.stat-item p {
  font-size: 0.9rem;
  opacity: 0.9;
  color: rgba(255,255,255,0.85);
}

/* ============================================
   HOW IT WORKS SECTION
   ============================================ */
.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  counter-reset: step;
}

.step-card {
  text-align: center;
  padding: 2rem;
  position: relative;
}

.step-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(79,70,229,0.15);
  border: 2px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary-light);
  margin: 0 auto 1.2rem;
  font-family: var(--font-mono);
}

.step-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.step-card p {
  color: var(--gray-400);
  font-size: 0.93rem;
}

/* ============================================
   UNDERSTANDING RESULTS / EDUCATIONAL
   ============================================ */
.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.info-card {
  background: var(--dark-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}

.info-card:hover {
  border-color: rgba(79,70,229,0.2);
}

.info-card .info-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.info-card .info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.info-card h3 {
  font-size: 1.1rem;
}

.info-card p {
  color: var(--gray-400);
  font-size: 0.93rem;
  line-height: 1.7;
}

.info-card .speed-range {
  display: inline-block;
  margin-top: 0.8rem;
  padding: 0.3rem 0.8rem;
  background: rgba(79,70,229,0.1);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-light);
  font-family: var(--font-mono);
}

/* Color modifiers for info icons */
.icon-download { background: rgba(79,70,229,0.15); color: var(--primary-light); }
.icon-upload { background: rgba(6,182,212,0.15); color: var(--secondary); }
.icon-ping { background: rgba(16,185,129,0.15); color: var(--success); }
.icon-jitter { background: rgba(245,158,11,0.15); color: var(--accent); }

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  margin-bottom: 0.8rem;
  overflow: hidden;
  background: var(--dark-secondary);
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(79,70,229,0.2);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.2rem 1.5rem;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-primary);
  gap: 1rem;
}

.faq-question i {
  font-size: 0.8rem;
  color: var(--gray-400);
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-question i {
  transform: rotate(180deg);
  color: var(--primary-light);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer-inner {
  padding: 0 1.5rem 1.2rem;
  color: var(--gray-400);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

/* ============================================
   AD PLACEHOLDER (AdSense Ready)
   ============================================ */
.ad-slot {
  background: rgba(255,255,255,0.02);
  border: 1px dashed rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  margin: 2rem 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.8rem;
}

.ad-slot-horizontal {
  max-width: 728px;
  margin-left: auto;
  margin-right: auto;
}

.ad-slot-sidebar {
  width: 100%;
  min-height: 250px;
}

/* ============================================
   CONTENT PAGES
   ============================================ */
.page-hero {
  padding: 120px 2rem 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(79,70,229,0.12) 0%, transparent 60%);
  z-index: 0;
}

.page-hero > * {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.page-hero p {
  color: var(--gray-400);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-bottom: 1rem;
}

.breadcrumbs a {
  color: var(--gray-400);
}

.breadcrumbs a:hover {
  color: var(--primary-light);
}

.breadcrumbs .separator {
  color: var(--gray-600);
}

/* Article Content */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.content-main {
  min-width: 0;
}

.content-sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 2.5rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.article-content h2:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 1.8rem 0 0.8rem;
}

.article-content p {
  margin-bottom: 1rem;
  color: var(--gray-300);
  font-size: 1rem;
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
  color: var(--gray-300);
}

.article-content li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.article-content strong {
  color: var(--white);
}

.article-content blockquote {
  border-left: 3px solid var(--primary);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: rgba(79,70,229,0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--gray-300);
}

/* Speed Reference Table */
.speed-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.93rem;
}

.speed-table th {
  background: rgba(79,70,229,0.1);
  padding: 0.8rem 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--white);
  border-bottom: 2px solid rgba(79,70,229,0.3);
}

.speed-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  color: var(--gray-300);
}

.speed-table tr:hover td {
  background: rgba(255,255,255,0.02);
}

/* Sidebar Widgets */
.sidebar-widget {
  background: var(--dark-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.sidebar-widget h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.toc-list {
  list-style: none;
  padding: 0;
}

.toc-list li {
  margin-bottom: 0.5rem;
}

.toc-list a {
  font-size: 0.88rem;
  color: var(--gray-400);
  display: block;
  padding: 0.3rem 0;
  padding-left: 1rem;
  border-left: 2px solid transparent;
  transition: var(--transition);
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--primary-light);
  border-left-color: var(--primary);
}

/* Tip cards */
.tip-card {
  background: var(--dark-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.tip-card:hover {
  border-color: rgba(79,70,229,0.2);
  transform: translateY(-2px);
}

.tip-card .tip-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tip-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--white);
  flex-shrink: 0;
}

.tip-card h3 {
  font-size: 1.1rem;
}

.tip-card p {
  color: var(--gray-400);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  padding: 5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(79,70,229,0.1) 0%, transparent 70%);
}

.cta-section > * {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 1rem;
}

.cta-section p {
  color: var(--gray-400);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  padding: 0.9rem 2.5rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--white);
  padding: 0.9rem 2.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  color: var(--white);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--dark-secondary);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 4rem 2rem 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .nav-logo {
  margin-bottom: 1rem;
}

.footer-brand p {
  color: var(--gray-400);
  font-size: 0.93rem;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-300);
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col li {
  margin-bottom: 0.5rem;
}

.footer-col a {
  color: var(--gray-400);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 3rem;
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: var(--white);
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.about-card {
  background: var(--dark-secondary);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
}

.about-card i {
  font-size: 2.5rem;
  color: var(--primary-light);
  margin-bottom: 1.2rem;
}

.about-card h3 {
  margin-bottom: 0.8rem;
}

.about-card p {
  color: var(--gray-400);
  font-size: 0.95rem;
}

/* ============================================
   HISTORY SECTION
   ============================================ */
.history-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.history-table th {
  background: rgba(79,70,229,0.1);
  padding: 0.8rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--gray-300);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.history-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 0.9rem;
  color: var(--gray-300);
  font-family: var(--font-mono);
}

.history-table tr:hover td {
  background: rgba(255,255,255,0.02);
}

.history-empty {
  text-align: center;
  padding: 2rem;
  color: var(--gray-500);
}

.clear-history-btn {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  color: var(--danger);
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-primary);
}

.clear-history-btn:hover {
  background: rgba(239,68,68,0.2);
}

/* ============================================
   ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .content-layout {
    grid-template-columns: 1fr;
  }
  
  .content-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem;
    gap: 1rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  
  .hero {
    padding-top: 90px;
    min-height: auto;
    padding-bottom: 40px;
  }
  
  .speed-test-card {
    padding: 2rem 1.2rem;
  }
  
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .gauge-container {
    width: 220px;
    height: 130px;
  }
  
  .gauge-number {
    font-size: 2.8rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .section {
    padding: 3.5rem 1.2rem;
  }
  
  .content-layout {
    padding: 2rem 1.2rem;
  }
}

@media (max-width: 480px) {
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
  }
  
  .result-item {
    padding: 0.8rem 0.5rem;
  }
  
  .result-value {
    font-size: 1.2rem;
  }
  
  .start-test-btn {
    padding: 0.9rem 2rem;
    font-size: 1rem;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.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;
}