/* ══════════════════════════════════════════════════
   STARTUP COSTS — Dark Editorial Design System
   Sharp. Authoritative. Amber warmth on deep black.
   ══════════════════════════════════════════════════ */

:root {
  --color-bg: #0b0b10;
  --color-surface: #111118;
  --color-surface-alt: #16161f;
  --color-surface-elevated: #1c1c28;
  --color-border: #1e2030;
  --color-border-light: #2a2d42;

  --color-accent: #e5a019;
  --color-accent-light: #f0ad1e;
  --color-accent-dark: #c98b14;
  --color-accent-glow: rgba(229, 160, 25, 0.12);
  --color-accent-muted: rgba(229, 160, 25, 0.08);

  --color-text: #e8eaf0;
  --color-text-secondary: #8b90a8;
  --color-text-muted: #4e536a;
  --color-white: #f5f6f8;

  --color-price: #34d399;
  --color-error: #ef4444;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter Tight', sans-serif;

  --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --text-lg: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  --text-xl: clamp(1.3rem, 1.1rem + 1vw, 1.7rem);
  --text-2xl: clamp(1.6rem, 1.3rem + 1.5vw, 2.2rem);
  --text-3xl: clamp(2rem, 1.5rem + 2.5vw, 3.2rem);
  --text-4xl: clamp(2.6rem, 1.8rem + 4vw, 4.8rem);
  --text-5xl: clamp(3.2rem, 2rem + 5vw, 6rem);

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  --max-width: 1200px;
  --article-width: 720px;
  --nav-height: 64px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 600ms;

  --radius: 6px;
  --radius-lg: 10px;
}

/* ═══ RESET ═══ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 24px) }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block }
a { color: inherit; text-decoration: none }
ul, ol { list-style: none }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit }

/* Noise texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  opacity: 0.025;
  pointer-events: none;
  z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ═══ TYPOGRAPHY ═══ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-white);
}
h1 { font-size: var(--text-5xl) }
h2 { font-size: var(--text-3xl) }
h3 { font-size: var(--text-2xl) }
h4 { font-size: var(--text-xl) }

.label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

/* ═══ LAYOUT ═══ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
@media (min-width: 768px) { .container { padding: 0 var(--space-2xl) } }

/* ═══ SCROLL PROGRESS ═══ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--color-accent);
  z-index: 10000;
  transition: none;
}

/* ═══ NAV ═══ */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--duration-normal), border-color var(--duration-normal);
  border-bottom: 1px solid transparent;
}
nav.scrolled {
  background: rgba(11, 11, 16, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--color-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
@media (min-width: 768px) { .nav-inner { padding: 0 var(--space-2xl) } }

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.01em;
}
.nav-logo span { color: var(--color-accent) }

.nav-links {
  display: none;
  gap: var(--space-xl);
  align-items: center;
}
@media (min-width: 768px) { .nav-links { display: flex } }
.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast);
  position: relative;
  padding: var(--space-xs) 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--duration-normal) var(--ease-out);
}
.nav-links a:hover { color: var(--color-white) }
.nav-links a:hover::after { width: 100% }

/* Mobile toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: 110;
}
@media (min-width: 768px) { .nav-toggle { display: none } }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-white);
  transition: transform var(--duration-normal) var(--ease-out), opacity var(--duration-fast);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 5px) }
.nav-toggle.open span:nth-child(2) { opacity: 0 }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -5px) }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(11, 11, 16, 0.97);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-xl);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal);
}
.mobile-menu.open { opacity: 1; pointer-events: all }
.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast);
}
.mobile-menu a:hover { color: var(--color-accent) }

/* ═══ HERO ═══ */
.hero {
  position: relative;
  padding: 80px 0 80px;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-accent-glow), transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2 }
.hero h1 { max-width: 800px }
.hero h1 .accent { color: var(--color-accent) }
.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-top: var(--space-lg);
  max-width: 560px;
  line-height: 1.6;
}
.hero-stats {
  display: flex;
  gap: var(--space-3xl);
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.hero-stat-value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-white);
}
.hero-stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* ═══ FEATURED SECTION ═══ */
.featured {
  padding: var(--space-4xl) 0;
}
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}
.section-header h2 { font-size: var(--text-2xl) }
.section-header .view-all {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
  transition: opacity var(--duration-fast);
}
.section-header .view-all:hover { opacity: 0.7 }

/* ═══ ARTICLE GRID ═══ */
.article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
@media (min-width: 640px) { .article-grid { grid-template-columns: 1fr 1fr } }
@media (min-width: 960px) { .article-grid { grid-template-columns: 1fr 1fr 1fr } }

.article-card {
  background: var(--color-surface);
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
  overflow: hidden;
  transition: background var(--duration-fast);
}
.article-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    var(--color-accent-muted),
    transparent 40%
  );
  opacity: 0;
  transition: opacity var(--duration-normal);
  pointer-events: none;
}
.article-card:hover { background: var(--color-surface-alt) }
.article-card:hover::before { opacity: 1 }

.article-card .card-number {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-border-light);
  line-height: 1;
  transition: color var(--duration-normal);
}
.article-card:hover .card-number { color: var(--color-accent-glow) }

.article-card .category {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}
.article-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-white);
  transition: color var(--duration-fast);
}
.article-card:hover h3 { color: var(--color-accent-light) }

.article-card .excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}
.article-card .meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.article-card .meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-muted);
}
.article-card .arrow {
  position: absolute;
  bottom: var(--space-2xl);
  right: var(--space-2xl);
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--color-text-muted);
  transition: border-color var(--duration-fast), color var(--duration-fast), transform var(--duration-fast);
}
.article-card:hover .arrow {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translate(4px, -4px);
}

/* ═══ CATEGORIES BAR ═══ */
.categories {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}
.category-list {
  display: flex;
  gap: var(--space-md);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.category-list::-webkit-scrollbar { display: none }
.category-pill {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  white-space: nowrap;
  transition: border-color var(--duration-fast), color var(--duration-fast), background var(--duration-fast);
}
.category-pill:hover,
.category-pill.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.category-pill.active {
  background: var(--color-accent-muted);
}

/* ═══ ARTICLE PAGE ═══ */
.article-page {
  padding: var(--space-3xl) 0 var(--space-4xl);
}
.article-page .article-inner {
  max-width: var(--article-width);
  margin: 0 auto;
}
.article-page .breadcrumb {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
}
.article-page .breadcrumb a {
  color: var(--color-text-secondary);
  transition: color var(--duration-fast);
}
.article-page .breadcrumb a:hover { color: var(--color-accent) }
.article-page .breadcrumb .sep { margin: 0 var(--space-sm); color: var(--color-text-muted) }

.article-page h1 {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-lg);
}
.article-page .article-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.article-page .article-meta .tag {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: var(--color-accent-muted);
  padding: 4px 12px;
  border-radius: 100px;
}

/* Article body content */
.article-body h2 {
  font-size: var(--text-2xl);
  margin: var(--space-3xl) 0 var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}
.article-body h2:first-child { border-top: none; padding-top: 0 }
.article-body h3 {
  font-size: var(--text-xl);
  margin: var(--space-2xl) 0 var(--space-md);
}
.article-body p {
  margin-bottom: var(--space-lg);
  color: var(--color-text);
  line-height: 1.8;
}
.article-body ul, .article-body ol {
  margin: 0 0 var(--space-lg) var(--space-lg);
  list-style: none;
}
.article-body li {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-lg);
  position: relative;
  line-height: 1.7;
}
.article-body li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}
.article-body ol { counter-reset: ol-counter }
.article-body ol li { counter-increment: ol-counter }
.article-body ol li::before {
  content: counter(ol-counter);
  width: auto;
  height: auto;
  border-radius: 0;
  background: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-accent);
  top: 2px;
}
.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-accent-glow);
  transition: text-decoration-color var(--duration-fast);
}
.article-body a:hover { text-decoration-color: var(--color-accent) }
.article-body strong { color: var(--color-white); font-weight: 600 }

/* ═══ COST TABLE ═══ */
.cost-table-wrapper {
  margin: var(--space-2xl) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.cost-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.cost-table thead {
  background: var(--color-surface-elevated);
}
.cost-table th {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}
.cost-table td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}
.cost-table tbody tr { transition: background var(--duration-fast) }
.cost-table tbody tr:hover { background: var(--color-surface-alt) }
.cost-table tbody tr:last-child td { border-bottom: none }
.cost-table .price {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-price);
}

/* Responsive table */
@media (max-width: 640px) {
  .cost-table th, .cost-table td { padding: var(--space-sm) var(--space-md); font-size: var(--text-xs) }
}

/* ═══ TAKEAWAY BOX ═══ */
.takeaway {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  padding: var(--space-xl) var(--space-2xl);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--space-2xl) 0;
}
.takeaway strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}
.takeaway p { margin-bottom: 0; color: var(--color-text-secondary) }

/* ═══ NEWSLETTER ═══ */
.newsletter {
  padding: var(--space-4xl) 0;
  border-top: 1px solid var(--color-border);
}
.newsletter-inner {
  max-width: 560px;
  text-align: center;
  margin: 0 auto;
}
.newsletter h2 { font-size: var(--text-2xl); margin-bottom: var(--space-md) }
.newsletter p { color: var(--color-text-secondary); margin-bottom: var(--space-xl) }
.newsletter-form {
  display: flex;
  gap: var(--space-sm);
}
.newsletter-form input {
  flex: 1;
  padding: 14px var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--duration-fast);
}
.newsletter-form input:focus { border-color: var(--color-accent) }
.newsletter-form input::placeholder { color: var(--color-text-muted) }
.newsletter-form button {
  padding: 14px var(--space-xl);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-bg);
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--duration-fast), transform var(--duration-fast);
  white-space: nowrap;
}
.newsletter-form button:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
}
@media (max-width: 480px) {
  .newsletter-form { flex-direction: column }
}

/* ═══ FOOTER ═══ */
footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.footer-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.footer-links {
  display: flex;
  gap: var(--space-lg);
}
.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  transition: color var(--duration-fast);
}
.footer-links a:hover { color: var(--color-text-secondary) }

/* ═══ REVEAL ANIMATIONS ═══ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══ CURSOR GLOW ═══ */
.cursor-glow {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle, var(--color-accent-glow), transparent 70%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.4s ease;
}
.cursor-glow.visible { opacity: 1 }

/* ═══ RESPONSIVE ═══ */
@media (max-width: 768px) {
  .hero { padding: 60px 0 60px }
  .hero-stats { gap: var(--space-xl); flex-wrap: wrap }
  .article-page { padding: var(--space-2xl) 0 var(--space-3xl) }
}

@media (max-width: 480px) {
  .section-header { flex-direction: column; gap: var(--space-sm) }
}

/* ═══ REDUCED MOTION ═══ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none }
}

/* ═══ FOCUS ═══ */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}
:focus:not(:focus-visible) { outline: none }

/* Skip to content */
.skip-to-content {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  z-index: 200;
  border-radius: var(--radius);
}
.skip-to-content:focus { top: var(--space-md) }