/* ── 1 Step Converter — Shared Styles ── */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@300;400;500&display=swap');

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

:root {
  --bg:       #080810;
  --surface:  #0f0f1a;
  --surface2: #181825;
  --surface3: #21213a;
  --border:   rgba(255,255,255,0.07);
  --border2:  rgba(255,255,255,0.12);
  --text:     #eeeef5;
  --muted:    #6e6e8a;
  --muted2:   #9898b8;
  --accent:   #4f8eff;
  --accent2:  #a78bfa;
  --accent3:  #34d399;
  --glow:     rgba(79,142,255,0.18);
  --radius:   16px;
  --radius-sm:10px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,8,16,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 clamp(1rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo .logo-mark {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: white;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-links a {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
}

.nav-links a:hover { color: var(--text); background: var(--surface3); }
.nav-links a.active { color: var(--accent); background: rgba(79,142,255,0.1); }

/* ── PAGE WRAPPER ── */
.page-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 2rem);
}

.page-wrap.wide { max-width: 1100px; }

/* ── PAGE HEADER ── */
.page-header {
  margin-bottom: 2.5rem;
}

.page-header .eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
  display: block;
}

.page-header h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text);
}

.page-header .sub {
  font-size: 0.85rem;
  color: var(--muted2);
  margin-top: 0.5rem;
  font-weight: 400;
}

/* ── CARD ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
}

.card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(79,142,255,0.03) 0%, transparent 60%);
  pointer-events: none;
}

/* ── INPUTS ── */
.field-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.45rem;
  display: block;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 1.5rem;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  background: var(--surface2);
  border: 1.5px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--glow);
}

input::placeholder { color: var(--muted); opacity: 0.4; }

select {
  font-size: 0.9rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  padding-right: 2.5rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236e6e8a' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.9rem center;
  min-width: 170px;
}

/* ── DIVIDER ── */
.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.divider::before, .divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

/* ── RESULTS GRID ── */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.65rem;
}

.result-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  cursor: pointer;
  position: relative;
  transition: border-color 0.18s, transform 0.15s, box-shadow 0.18s;
  overflow: hidden;
}

.result-card:hover {
  border-color: rgba(79,142,255,0.4);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
}

.result-card.highlight {
  border-color: var(--accent);
  background: rgba(79,142,255,0.06);
}

.result-card.highlight::before {
  content: ''; position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}

.r-unit {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.r-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
  line-height: 1.3;
}

.result-card.highlight .r-value { color: var(--accent3); }

.r-name {
  font-size: 0.68rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.copy-pip {
  position: absolute;
  top: 0.45rem; right: 0.5rem;
  font-size: 0.58rem;
  font-family: 'JetBrains Mono', monospace;
  background: var(--accent);
  color: white;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  opacity: 0;
  transform: scale(0.85);
  transition: opacity 0.15s, transform 0.15s;
  pointer-events: none;
}

.result-card.copied .copy-pip { opacity: 1; transform: scale(1); }

/* ── TABS ── */
.tabs {
  display: flex;
  gap: 0.3rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tab {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}

.tab:hover { border-color: var(--accent); color: var(--text); }
.tab.active { background: var(--accent); border-color: var(--accent); color: white; }

/* ── FORMULA BAR ── */
.formula-bar {
  margin-top: 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted2);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 38px;
}

.formula-bar .f-label {
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

/* ── FOOTER ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem clamp(1rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer p {
  font-size: 0.75rem;
  color: var(--muted);
}

.site-footer a {
  color: var(--muted2);
  text-decoration: none;
  font-size: 0.75rem;
}

.site-footer a:hover { color: var(--accent); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-in { animation: fadeUp 0.5s ease both; }
.delay-1 { animation-delay: 0.05s; }
.delay-2 { animation-delay: 0.1s; }
.delay-3 { animation-delay: 0.15s; }

/* ── RESPONSIVE ── */
@media (max-width: 520px) {
  .input-row { grid-template-columns: 1fr; }
  select { min-width: unset; }
  .results-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}