/* ── InstaCalc shared stylesheet ── */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Mono:wght@300;400;500&family=Instrument+Serif:ital@0;1&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink: #0d0d0d;
  --paper: #f5f2eb;
  --cream: #ede9de;
  --accent: #c8432a;
  --muted: #6b6560;
  --border: #d4cfc6;
  --mono: 'DM Mono', monospace;
  --display: 'Syne', sans-serif;
  --serif: 'Instrument Serif', serif;
  --cat-money: #c8432a;
  --cat-fitness: #2a8f52;
  --cat-student: #2a6fc8;
  --cat-everyday: #c8922a;
  --cat-work: #9b3dbd;
}

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--display);
  min-height: 100vh;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
}

/* ── NAV ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--ink);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 54px;
  border-bottom: 2px solid var(--accent);
}

.nav-logo {
  font-size: 1.1rem; font-weight: 800; letter-spacing: -0.5px;
  color: var(--paper); text-decoration: none; display: flex; align-items: center; gap: 6px;
}
.nav-logo span { color: var(--accent); font-family: var(--mono); }

.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a { color: #999; text-decoration: none; font-size: 0.72rem; letter-spacing: 1px; text-transform: uppercase; font-weight: 600; transition: color .2s; }
.nav-links a:hover { color: var(--paper); }

.nav-home-btn {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 1px; text-transform: uppercase;
  padding: 6px 14px; border: 1px solid #444; color: #999; text-decoration: none; transition: all .2s;
}
.nav-home-btn:hover { border-color: var(--paper); color: var(--paper); }

/* ── BREADCRUMB ── */
.breadcrumb {
  max-width: 860px; margin: 0 auto; padding: 1rem 2rem 0;
  font-family: var(--mono); font-size: 0.68rem; color: var(--muted); display: flex; gap: 0.5rem; align-items: center;
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb-sep { opacity: 0.4; }

/* ── CALC PAGE LAYOUT ── */
.calc-page { max-width: 860px; margin: 0 auto; padding: 2rem 2rem 5rem; }

.calc-page-header { margin-bottom: 2rem; }

.calc-cat-tag {
  display: inline-block; font-family: var(--mono); font-size: 0.65rem; letter-spacing: 2px; text-transform: uppercase;
  padding: 4px 12px; border-radius: 100px; margin-bottom: 0.75rem;
  color: #fff;
}

.calc-page-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; letter-spacing: -1.5px;
  line-height: 1.05; margin-bottom: 0.5rem;
}

.calc-page-desc { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); line-height: 1.6; max-width: 560px; }

/* ── TOOL CARD ── */
.tool-card {
  background: var(--ink); padding: 2rem; margin-bottom: 2rem;
  border-left: 4px solid var(--accent-color, var(--accent));
  animation: fadeUp .4s ease both;
}

@keyframes fadeUp { from { opacity:0; transform: translateY(16px); } to { opacity:1; transform:none; } }

/* ── FIELDS ── */
.field { margin-bottom: 1rem; }
.field label {
  display: block; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 1.5px; text-transform: uppercase;
  color: #888; margin-bottom: 0.4rem; font-weight: 500;
}
.field input, .field select {
  width: 100%; padding: 0.8rem 1rem; background: #1a1a1a;
  border: 1.5px solid #2e2e2e; font-family: var(--mono); font-size: 0.9rem;
  color: var(--paper); outline: none; transition: border-color .2s; border-radius: 0; -webkit-appearance: none;
}
.field input:focus, .field select:focus { border-color: #555; }
.field input::placeholder { color: #444; }
.field select option { background: #1a1a1a; }

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

.calc-btn {
  width: 100%; padding: 1rem; background: var(--accent-color, var(--accent));
  color: #fff; border: none; font-family: var(--display); font-size: 0.9rem; font-weight: 700;
  letter-spacing: 0.5px; cursor: pointer; transition: opacity .2s; margin-top: 0.5rem; border-radius: 0;
}
.calc-btn:hover { opacity: 0.88; }

/* ── RESULT ── */
.result-box {
  margin-top: 1.5rem; padding: 1.5rem; background: #111;
  border-top: 3px solid var(--accent-color, var(--accent));
  display: none; animation: fadeUp .25s ease;
}
.result-box.show { display: block; }

.result-label { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 2px; text-transform: uppercase; color: #555; margin-bottom: 0.4rem; }
.result-main { font-size: 2.4rem; font-weight: 800; letter-spacing: -1.5px; color: var(--paper); line-height: 1; }
.result-sub { font-family: var(--mono); font-size: 0.75rem; color: #666; margin-top: 0.5rem; line-height: 1.6; }

.result-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem;
  margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid #222;
}
.result-item-label { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 1px; text-transform: uppercase; color: #555; margin-bottom: 3px; }
.result-item-val { font-weight: 700; font-size: 1.05rem; color: var(--paper); }

/* ── EXPLAINER ── */
.explainer { margin-bottom: 2rem; }
.explainer h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.6rem; letter-spacing: -0.3px; }
.explainer p { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); line-height: 1.7; }

/* ── FAQ ── */
.faq { margin-bottom: 2rem; }
.faq h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; letter-spacing: -0.3px; }
.faq-item { border-top: 1px solid var(--border); }
.faq-q {
  padding: 0.85rem 0; font-size: 0.9rem; font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  user-select: none;
}
.faq-icon { font-size: 1.2rem; font-weight: 300; color: var(--muted); flex-shrink: 0; }
.faq-a { font-family: var(--mono); font-size: 0.77rem; color: var(--muted); line-height: 1.7; padding-bottom: 0.85rem; display: none; }
.faq-a.open { display: block; }
.faq-item:last-child { border-bottom: 1px solid var(--border); }

/* ── RELATED ── */
.related { margin-bottom: 2rem; }
.related h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; letter-spacing: -0.3px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); }
.related-card {
  background: var(--paper); padding: 1rem 1.25rem; text-decoration: none; color: var(--ink);
  display: block; transition: background .2s; position: relative; overflow: hidden;
}
.related-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  transform: scaleY(0); transition: transform .2s; transform-origin: bottom;
}
.related-card:hover { background: var(--cream); }
.related-card:hover::before { transform: scaleY(1); }
.related-card-cat { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 0.25rem; }
.related-card-title { font-size: 0.9rem; font-weight: 700; }

/* ── HOMEPAGE SPECIFICS ── */
.hp-hero { padding: 4rem 2rem 3rem; max-width: 900px; margin: 0 auto; text-align: center; }
.hp-tag { display: inline-block; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); border: 1px solid var(--border); padding: 4px 14px; border-radius: 100px; margin-bottom: 1rem; }
.hp-h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 800; letter-spacing: -2.5px; line-height: 1.05; margin-bottom: 1rem; }
.hp-h1 em { font-family: var(--serif); font-style: italic; font-weight: 400; color: var(--accent); }
.hp-sub { font-family: var(--mono); font-size: 0.85rem; color: var(--muted); max-width: 440px; margin: 0 auto 2.5rem; line-height: 1.6; }

.hp-search { position: relative; max-width: 520px; margin: 0 auto 2rem; }
.hp-search input {
  width: 100%; padding: 1rem 1.25rem 1rem 3rem; background: var(--ink); color: var(--paper);
  border: none; border-bottom: 3px solid var(--accent); font-family: var(--mono); font-size: 0.9rem;
  outline: none; border-radius: 0;
}
.hp-search input::placeholder { color: #555; }
.hp-search-icon { position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); color: var(--accent); pointer-events: none; }
.hp-search-results { position: absolute; top: 100%; left: 0; right: 0; background: var(--ink); border: 1px solid #222; border-top: none; display: none; z-index: 50; }
.hp-search-results.open { display: block; }
.hp-search-result { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1.25rem; font-family: var(--mono); font-size: 0.78rem; color: #999; text-decoration: none; transition: background .15s; }
.hp-search-result:hover { background: #1a1a1a; color: var(--paper); }
.hp-search-result .dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

.cat-pills { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; margin-bottom: 0.5rem; }
.cat-pill { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.5px; padding: 6px 16px; border: 1.5px solid var(--border); background: transparent; cursor: pointer; transition: all .2s; color: var(--muted); font-weight: 500; }
.cat-pill:hover, .cat-pill.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.hp-grid-wrap { max-width: 1100px; margin: 0 auto; padding: 1rem 2rem 5rem; }
.section-label { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 3px; text-transform: uppercase; color: var(--muted); margin-bottom: 1.5rem; display: flex; align-items: center; gap: 1rem; }
.section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.hp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5px; background: var(--border); border: 1.5px solid var(--border); }
.hp-card {
  background: var(--paper); padding: 1.5rem; text-decoration: none; color: var(--ink);
  display: flex; flex-direction: column; gap: 0.4rem; position: relative; overflow: hidden;
  transition: background .2s; animation: fadeUp .35s ease both;
}
.hp-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--card-accent); transform: scaleY(0); transition: transform .25s; transform-origin: bottom;
}
.hp-card:hover { background: var(--cream); }
.hp-card:hover::before { transform: scaleY(1); }
.hp-card-tag { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 1.5px; text-transform: uppercase; font-weight: 500; }
.hp-card-title { font-size: 1rem; font-weight: 700; letter-spacing: -0.3px; line-height: 1.2; }
.hp-card-desc { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); line-height: 1.5; flex: 1; }
.hp-card-arrow { font-family: var(--mono); font-size: 0.68rem; margin-top: 0.5rem; opacity: 0; transition: opacity .2s; }
.hp-card:hover .hp-card-arrow { opacity: 1; }

/* ── FOOTER ── */
footer {
  background: var(--ink); color: #444; font-family: var(--mono); font-size: 0.68rem;
  text-align: center; padding: 2rem; border-top: 2px solid var(--accent); line-height: 2;
}
footer a { color: #666; text-decoration: none; }
footer a:hover { color: var(--paper); }
footer strong { color: var(--paper); }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .nav { padding: 0 1rem; }
  .nav-links { display: none; }
  .calc-page { padding: 1.5rem 1rem 4rem; }
  .field-row { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .hp-hero { padding: 2.5rem 1rem 2rem; }
  .hp-grid-wrap { padding: 1rem 1rem 4rem; }
  .result-main { font-size: 1.8rem; }
}