/* kofinance.xyz — ROI Calculator
   Visual identity: indigo + neon-green, uppercase wide-tracking sans,
   split-screen layout, 2px sharp corners, triangular brand mark. */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;
  font-size: 16px; line-height: 1.6;
  color: #1a1a2e; background: #f6f6f0;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: #1d1b4a; text-decoration: none; border-bottom: 2px solid #9ef01a; }
a:hover { color: #4a4493; border-bottom-color: #1d1b4a; }

h1, h2, h3, h4 {
  font-family: -apple-system, "Inter", "Segoe UI", sans-serif;
  font-weight: 800;
  letter-spacing: .03em; text-transform: uppercase;
  color: #1d1b4a; line-height: 1.15; margin: 0 0 .55em;
}
h1 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: .02em; }
h2 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); margin-top: 1.6em; letter-spacing: .04em; }
h3 { font-size: 1rem; letter-spacing: .08em; font-weight: 700; }
p { margin: 0 0 1em; }

code, kbd, samp, .mono {
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: .9em; background: #1d1b4a; color: #9ef01a; padding: .12em .4em; border-radius: 0;
}

:root {
  --indigo: #1d1b4a;
  --indigo-light: #4a4493;
  --indigo-soft: #e3e1f5;
  --neon: #9ef01a;
  --neon-dim: #7ac11a;
  --bone: #f6f6f0;
  --paper: #ebebe1;
  --line: #d6d6cb;
  --text: #1a1a2e;
  --muted: #6c6c7a;
  --hi: #1d1b4a;
}

.container { width: min(1140px, 92%); margin: 0 auto; }

/* ---- Header ---- */
.site-header {
  background: var(--indigo);
  color: var(--bone);
  border-bottom: 3px solid var(--neon);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: .9rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .65rem; line-height: 1.1; }
.brand-mark {
  width: 40px; height: 40px;
  background: var(--indigo);
  border: 2px solid var(--neon);
  display: grid; place-items: center;
  flex-shrink: 0;
  position: relative;
}
.brand-mark::before {
  content: "";
  width: 0; height: 0;
  border-left: 9px solid transparent;
  border-right: 9px solid transparent;
  border-bottom: 14px solid var(--neon);
}
.brand-text { display: inline-flex; flex-direction: column; gap: 1px; }
.brand-name {
  color: var(--bone); font-weight: 800;
  font-size: 1rem; text-transform: uppercase; letter-spacing: .02em;
}
.brand-tagline {
  font-size: .68rem; font-weight: 700; color: var(--neon);
  text-transform: uppercase; letter-spacing: .15em;
}
@media (max-width: 720px) { .brand-tagline { display: none; } }

.nav { display: flex; flex-wrap: wrap; gap: .25rem 1rem; align-items: center; row-gap: .25rem; }
.nav a {
  font-weight: 700; color: var(--bone);
  font-size: .82rem; padding: .3rem 0;
  white-space: nowrap; border-bottom: 2px solid transparent;
  text-transform: uppercase; letter-spacing: .08em;
}
.nav a:hover { color: var(--neon); border-bottom-color: var(--neon); }
.nav-toggle {
  display: none; background: transparent; border: 0; padding: .4rem; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--neon);
  margin: 5px 0;
}

/* ---- Hero (split-screen) ---- */
.hero {
  padding: 0;
  background: var(--bone);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid; grid-template-columns: 1.2fr 1fr;
  min-height: 420px;
}
.hero-text {
  padding: 4rem 3rem 3rem 0;
}
.hero-result {
  background: var(--indigo); color: var(--bone);
  padding: 4rem 3rem;
  display: flex; flex-direction: column; justify-content: center;
  position: relative; overflow: hidden;
}
.hero-result::after {
  content: "";
  position: absolute; bottom: -40px; right: -40px;
  width: 0; height: 0;
  border-left: 80px solid transparent;
  border-right: 80px solid transparent;
  border-bottom: 130px solid rgba(158, 240, 26, .08);
}
.eyebrow {
  display: inline-block;
  font-size: .73rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--neon-dim); font-weight: 800;
  background: var(--indigo); padding: .3rem .8rem;
  margin-bottom: 1.2rem;
}
.lead { font-size: 1.05rem; color: var(--muted); }

.hero-result .label {
  color: var(--neon); font-size: .72rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .2em; margin-bottom: .8rem;
}
.hero-result .preview-num {
  font-size: clamp(3rem, 7vw, 4.8rem); font-weight: 800;
  color: var(--bone); letter-spacing: -.02em; line-height: 1;
}
.hero-result .preview-meta {
  margin-top: 1.4rem; padding-top: 1.4rem;
  border-top: 1px solid rgba(158, 240, 26, .25);
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  font-family: "JetBrains Mono", Consolas, monospace; font-size: .82rem;
}
.hero-result .preview-meta .k { color: rgba(246, 246, 240, .6); }
.hero-result .preview-meta .v { color: var(--neon); font-weight: 700; }

/* ---- Tool ---- */
.tool {
  background: var(--bone);
  border: 2px solid var(--indigo);
  margin: 2.5rem 0;
}
.tool-head {
  background: var(--indigo); color: var(--bone);
  padding: 1rem 1.4rem;
  display: flex; justify-content: space-between; align-items: center;
}
.tool-head h2 { color: var(--bone); margin: 0; font-size: 1.1rem; }
.tool-body {
  padding: 1.6rem;
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 0;
}
.tool-inputs {
  display: grid; gap: 1rem;
  padding-right: 1.6rem;
  border-right: 2px dashed var(--line);
}
.field { display: flex; flex-direction: column; gap: .35rem; }
.field label {
  font-size: .73rem; font-weight: 800; color: var(--indigo);
  text-transform: uppercase; letter-spacing: .12em;
}
.field input, .field select {
  font: inherit; font-family: "JetBrains Mono", Consolas, monospace;
  padding: .65rem .85rem;
  border: 2px solid var(--indigo); border-radius: 2px;
  background: var(--bone); color: var(--hi);
  font-weight: 600;
}
.field input:focus, .field select:focus {
  outline: none; background: #fff;
  box-shadow: 4px 4px 0 var(--neon);
}
.field small { color: var(--muted); font-size: .8rem; }

.tool-output {
  padding-left: 1.6rem;
  display: flex; flex-direction: column; justify-content: center;
}
.tool-output h3 {
  color: var(--neon-dim); margin: 0 0 .4rem;
  font-size: .72rem; letter-spacing: .15em;
}
.tool-output .big {
  font-family: -apple-system, sans-serif;
  font-size: 3rem; font-weight: 800; color: var(--indigo);
  letter-spacing: -.02em; line-height: 1;
}
.tool-output .grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: .8rem;
  margin-top: 1.4rem;
}
.tool-output .stat {
  padding: .8rem 1rem;
  background: var(--paper); border-left: 3px solid var(--neon);
}
.tool-output .stat .k {
  font-size: .7rem; color: var(--muted); text-transform: uppercase; letter-spacing: .1em; font-weight: 700;
}
.tool-output .stat .v {
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 1rem; font-weight: 700; color: var(--indigo); margin-top: .25rem;
}

.benchmark {
  margin-top: 1rem; padding: .8rem 1rem;
  background: var(--indigo-soft); border-left: 3px solid var(--indigo);
  font-size: .9rem;
}

.privacy-note {
  font-size: .82rem; color: var(--muted);
  border-left: 2px solid var(--neon);
  padding: .55rem .9rem; margin-top: 1.2rem; background: var(--paper);
}

/* ---- Content ---- */
.content { padding: 1.5rem 0 3rem; }
.content section { margin-bottom: 2rem; }

.author-card {
  display: grid; grid-template-columns: 92px 1fr; gap: 1.4rem;
  align-items: center; padding: 1.4rem;
  background: var(--indigo); color: var(--bone);
  margin: 1.2rem 0;
  border-left: 4px solid var(--neon);
}
.author-avatar {
  width: 92px; height: 92px;
  background: var(--bone); color: var(--indigo);
  display: grid; place-items: center;
  font-size: 1.9rem; font-weight: 800;
  letter-spacing: -1px;
  border: 2px solid var(--neon);
}
.author-card h3 { color: var(--bone); margin: 0 0 .25rem; font-size: 1.05rem; }
.author-meta { color: var(--neon); font-size: .85rem; margin: 0 0 .4rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; }
.cred-row { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .6rem; }
.cred-row span {
  display: inline-block; padding: .15rem .55rem;
  background: var(--bone); color: var(--indigo);
  font-size: .72rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .04em;
}

.ref-table-wrap { overflow-x: auto; border: 2px solid var(--indigo); background: var(--bone); }
.ref-table { width: 100%; border-collapse: collapse; font-size: .92rem; min-width: 480px; }
.ref-table th, .ref-table td {
  padding: .65rem .85rem; text-align: left;
  border-bottom: 1px solid var(--line);
}
.ref-table thead th {
  background: var(--indigo); color: var(--neon);
  font-weight: 800; text-transform: uppercase; font-size: .75rem; letter-spacing: .1em;
}
.ref-table tbody tr:hover td { background: var(--paper); }
.ref-table td.num { font-family: "JetBrains Mono", Consolas, monospace; text-align: right; }

.callout {
  border-left: 4px solid var(--neon);
  background: var(--indigo); color: var(--bone);
  padding: 1rem 1.2rem; margin: 1.2rem 0;
  font-size: .95rem;
}
.callout strong { color: var(--neon); }

/* Forms */
.form-card {
  background: var(--bone); border: 2px solid var(--indigo);
  padding: 1.8rem;
  margin: 1rem 0 2rem;
}
.form-card label { display: grid; gap: .35rem; margin-bottom: 1rem; font-size: .75rem; color: var(--indigo); font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.form-card input, .form-card textarea, .form-card select {
  font: inherit; padding: .65rem .85rem;
  border: 2px solid var(--indigo); background: var(--bone);
}
.form-card input:focus, .form-card textarea:focus, .form-card select:focus {
  outline: none; background: #fff;
  box-shadow: 3px 3px 0 var(--neon);
}
.btn {
  display: inline-block; padding: .7rem 1.6rem;
  font: inherit; font-weight: 800; font-size: .85rem;
  cursor: pointer; text-transform: uppercase; letter-spacing: .12em;
  border: 2px solid var(--indigo); background: var(--neon); color: var(--indigo);
}
.btn:hover { background: var(--indigo); color: var(--neon); }

/* Footer */
.site-footer {
  background: var(--indigo); color: rgba(246, 246, 240, .65);
  padding: 2.6rem 0 1.4rem;
  border-top: 3px solid var(--neon);
}
.site-footer a { color: var(--neon); border-bottom: none; }
.site-footer a:hover { color: var(--bone); }
.site-footer .brand-name { color: var(--bone); }
.site-footer .brand-tagline { color: var(--neon); }
.footer-grid {
  display: grid; gap: 1.6rem;
  grid-template-columns: 2fr 1fr 1fr;
  margin-bottom: 1.4rem;
}
.site-footer h4 {
  color: var(--neon); font-size: .8rem;
  margin-bottom: .8rem; text-transform: uppercase; letter-spacing: .12em; font-weight: 800;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .35rem 0; font-size: .9rem; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .8rem;
  padding-top: 1.2rem; border-top: 1px solid rgba(158, 240, 26, .15);
  font-size: .8rem;
}

/* Responsive */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-text { padding: 3rem 0 2rem; }
  .hero-result { padding: 2.5rem; }
  .tool-body { grid-template-columns: 1fr; }
  .tool-inputs { padding-right: 0; border-right: none; padding-bottom: 1.2rem; border-bottom: 2px dashed var(--line); }
  .tool-output { padding-left: 0; padding-top: 1.2rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .author-card { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 100%; right: 4%; left: 4%;
    background: var(--indigo); border: 2px solid var(--neon);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: .5rem; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: .65rem .85rem; border-bottom: none; }
  .nav a:hover { background: rgba(158, 240, 26, .12); }
}