:root {
  --color-paper: #f7f5f0;
  --color-ink: #111111;
  --color-accent: #d62828;
  
  --font-head: system-ui, 'Segoe UI', Roboto, sans-serif;
  --font-body: system-ui, 'Segoe UI', Roboto, sans-serif;
  
  --transition-speed: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  background-color: var(--color-paper);
  font-family: var(--font-body);
  color: var(--color-ink);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
  hyphens: auto;
}

body {
  margin: 3vw;
  border: 1px solid var(--color-ink);
  background-color: var(--color-paper);
  min-height: calc(100vh - 6vw);
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin: 0 0 1rem 0;
  text-transform: uppercase;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
p { margin: 0 0 1.5rem 0; font-weight: 400; font-size: 1.125rem; }
ul, ol { margin: 0 0 1.5rem 0; padding-left: 1.5rem; }
img { max-width: 100%; height: auto; display: block; object-fit: cover; border-radius: 0; }

/* Header & Nav */
header {
  position: absolute;
  top: 0; left: 0; width: 100%;
  padding: 1.5rem 3vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  background-color: transparent;
  transition: background-color var(--transition-speed);
  border-bottom: 1px solid transparent;
}

header.scrolled {
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-ink);
}

.brand {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--color-ink);
}

.nav-desktop {
  display: none;
}

.nav-desktop a {
  margin-left: 2rem;
  font-weight: 800;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
}

/* Links & Buttons */
a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-speed);
}

a:not(.btn):not(.brand):hover {
  border-bottom: 2px solid var(--color-accent);
}

.btn {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-paper);
  padding: 1rem 2rem;
  font-family: var(--font-head);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-speed), background-color var(--transition-speed);
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
  background-color: var(--color-ink);
  border-bottom: 2px solid transparent;
}

/* Mobile Menu */
.mobile-toggle {
  background: none; border: none;
  font-size: 1.5rem; cursor: pointer;
  color: var(--color-ink); padding: 0.5rem;
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 100%; left: 0; width: 100%;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-ink);
  padding: 1.5rem 3vw;
}

.mobile-menu.active {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  padding: 8rem 3vw 4rem 3vw;
  gap: 3rem;
  border-bottom: 1px solid var(--color-ink);
}

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.hero-img-wrap {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}

/* Vertical Flow */
main { flex: 1; }

.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 3vw;
}

.flow-container {
  counter-reset: flow-counter;
  position: relative;
  padding-left: 2.5rem;
  margin-left: 1.5rem;
  border-left: 1px solid var(--color-ink);
}

.flow-step {
  position: relative;
  margin-bottom: 5rem;
}

.flow-step::before {
  counter-increment: flow-counter;
  content: counter(flow-counter);
  position: absolute;
  left: -3.6rem;
  top: 0;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--color-ink);
  border-radius: 50%;
  background-color: var(--color-paper);
  color: var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  z-index: 2;
}

/* Blurred Cards */
.card-backdrop {
  background-color: var(--color-accent);
  padding: 0.5rem;
  margin-top: 1.5rem;
}

.card-glass {
  background: rgba(247, 245, 240, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(17, 17, 17, 0.15);
  padding: 2.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Article Styling */
article {
  max-width: 72ch;
  margin: 0 auto;
  padding: 4rem 3vw;
}

.article-hero {
  aspect-ratio: 16/9;
  margin-bottom: 3rem;
  border: 1px solid var(--color-ink);
}

.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--color-ink);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 1rem;
  border-bottom: 1px solid var(--color-ink);
}

th { background-color: var(--color-ink); color: var(--color-paper); font-family: var(--font-head); }

/* Forms & Tools */
.tool-box {
  border: 1px solid var(--color-ink);
  padding: 2rem;
  background-color: var(--color-paper);
  margin-top: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="number"],
textarea {
  width: 100%;
  padding: 1rem;
  background: transparent;
  border: 1px solid var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  border-radius: 0;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.receipt-output {
  background-color: var(--color-ink);
  color: var(--color-paper);
  padding: 1.5rem;
  font-family: monospace;
  white-space: pre-wrap;
  margin: 1.5rem 0;
  display: none;
}

/* Footer */
footer {
  margin-top: auto;
  border-top: 1px solid var(--color-ink);
  padding: 4rem 3vw 2rem 3vw;
  background-color: transparent;
  transition: background-color var(--transition-speed);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  border-top: 1px solid var(--color-ink);
  padding-top: 2rem;
  font-size: 0.9rem;
  gap: 1rem;
}

.footer-legal-links a {
  margin-right: 1.5rem;
}

/* Media Queries */
@media (min-width: 768px) {
  .hero { grid-template-columns: 1.2fr 1fr; align-items: center; padding-top: 10rem; }
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
  .footer-bottom { flex-direction: row; align-items: center; }
}

@media (min-width: 1024px) {
  .nav-desktop { display: flex; }
  .mobile-toggle { display: none; }
  .mobile-menu { display: none !important; }
}

@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}