/* ===== C-7 Design System — Minimal & Clean ===== */

:root {
  --bg: #f8f8f7;
  --surface: #fff;
  --ink: #111;
  --muted: #555;
  --accent: #e85d2a;
  --line: #e0e0de;
  --line-light: #eee;
  --radius: 4px;
  --max: 1100px;
  --mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

/* ===== Reset ===== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

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

/* ===== Layout ===== */

.container {
  width: min(var(--max), 90vw);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 8px 14px;
  z-index: 100;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
}

/* ===== Header ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 248, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.brand {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

.brand-text {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.primary-nav {
  display: flex;
  gap: 4px;
  align-items: center;
}

.primary-nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.88rem;
  padding: 6px 10px;
  border-radius: var(--radius);
  transition: color 0.15s;
}

.primary-nav a[aria-current="page"],
.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--ink);
}

.primary-nav a[aria-current="page"] {
  font-weight: 600;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: var(--radius);
  width: 40px;
  height: 40px;
  font-size: 0.8rem;
  cursor: pointer;
}

/* ===== Typography ===== */

h1, h2, h3, h4 {
  font-family: "Space Grotesk", sans-serif;
  line-height: 1.15;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 600;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 60ch;
  margin-bottom: 24px;
  line-height: 1.6;
}

.kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

/* ===== Sections ===== */

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

.section + .section {
  border-top: 1px solid var(--line-light);
}

.hero {
  padding: 80px 0 60px;
}

.page-hero {
  padding: 48px 0 24px;
}

/* ===== Buttons ===== */

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  padding: 12px 22px;
  font-weight: 600;
  font-size: 0.92rem;
  transition: opacity 0.15s;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.85;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
}

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

.btn-secondary:hover {
  border-color: var(--ink);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ===== Cards ===== */

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  background: var(--surface);
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  margin: 0;
  line-height: 1.6;
}

.card-link {
  margin-top: 16px;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  font-size: 0.88rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.card-link:hover {
  text-decoration: underline;
}

/* ===== Grids ===== */

.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* ===== Hero specifics ===== */

.hero .trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--mono);
}

/* ===== Problem cards (homepage) ===== */

.problem-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.problem-card h3 {
  margin-bottom: 8px;
}

.problem-card p {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.problem-card a {
  font-size: 0.88rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.problem-card a:hover {
  text-decoration: underline;
}

/* ===== Kim block (homepage) ===== */

.kim-block {
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.kim-block .kicker {
  color: var(--accent);
}

.kim-block ul {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 8px;
}

.kim-block li {
  padding-left: 20px;
  position: relative;
  color: var(--muted);
}

.kim-block li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ===== Proof section ===== */

.proof-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.proof-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 0.95rem;
}

.proof-list .year {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  flex-shrink: 0;
  min-width: 80px;
}

/* ===== CTA Banner ===== */

.cta-banner {
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
}

.cta-banner h2 {
  color: #fff;
  margin-bottom: 8px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.7);
  margin: 0 0 24px;
}

.cta-banner .btn-primary {
  background: var(--accent);
}

/* ===== Lists ===== */

.list-clean {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.list-clean li {
  padding-left: 20px;
  position: relative;
}

.list-clean li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--muted);
}

/* ===== Process steps ===== */

.process {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.process li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  align-items: baseline;
}

.process li::before {
  counter-increment: step;
  content: counter(step);
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

/* ===== Tables ===== */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ===== Forms ===== */

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.form-grid .full {
  grid-column: 1 / -1;
}

label {
  font-weight: 600;
  font-size: 0.88rem;
  display: block;
  margin-bottom: 4px;
}

input,
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  font: inherit;
  font-size: 0.95rem;
  background: var(--surface);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button {
  font: inherit;
  cursor: pointer;
}

/* ===== Breadcrumb ===== */

.breadcrumb {
  font-size: 0.82rem;
  font-family: var(--mono);
  color: var(--muted);
  margin-bottom: 12px;
}

.breadcrumb a {
  color: inherit;
}

.breadcrumb a:hover {
  color: var(--ink);
}

/* ===== Notice ===== */

.notice {
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  background: var(--surface);
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 16px;
}

/* ===== Footer ===== */

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.6);
  padding: 40px 0 24px;
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-title {
  font-family: "Space Grotesk", sans-serif;
  margin: 0 0 8px;
  color: #fff;
  font-weight: 600;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
}

.footer-links a:hover {
  color: #fff;
}

.footer-meta {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 16px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ===== Utility ===== */

.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ===== Responsive ===== */

@media (max-width: 900px) {
  .hero {
    padding: 48px 0 32px;
  }

  .section {
    padding: 48px 0;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .split,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .primary-nav {
    display: none;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .site-header.is-open .primary-nav {
    display: grid;
    position: absolute;
    top: 64px;
    left: 5vw;
    right: 5vw;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    z-index: 30;
  }

  .site-header.is-open .primary-nav a {
    padding: 10px 12px;
    border-radius: var(--radius);
  }

  .kim-block {
    padding: 28px;
  }

  .cta-banner {
    padding: 32px 24px;
  }

  h1 {
    font-size: clamp(1.8rem, 7vw, 2.6rem);
  }
}