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

:root {
  --black: #000000;
  --near-black: #080808;
  --surface-1: #0d0d0d;
  --surface-2: #111111;
  --surface-3: #161616;
  --border: rgba(255,255,255,0.07);
  --white: #ffffff;
  --grey-1: #d4d4d4;
  --grey-2: #9a9a9a;
  --grey-3: #5a5a5a;
  --grey-4: #2a2a2a;
  --loss: #ff5a45;
  --loss-dim: #ff8a72;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--black);
  color: var(--grey-1);
  font-family: var(--font);
  font-weight: 400;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

#bg-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; }

.container { max-width: 720px; margin: 0 auto; padding: 0 1.5rem; position: relative; z-index: 1; }

/* NAV */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.5rem 2rem;
  background: rgba(0,0,0,0);
  border-bottom: 1px solid transparent;
  transition: background 0.4s ease, border-color 0.4s ease, backdrop-filter 0.4s ease;
}
#navbar.scrolled {
  background: rgba(0,0,0,0.85);
  border-bottom-color: var(--border);
  backdrop-filter: blur(16px);
}
.logo-link { display: flex; align-items: center; flex-shrink: 0; }
.logo-img { height: 30px; width: auto; max-width: 150px; object-fit: contain; transition: opacity 0.25s ease; }
.logo-img:hover { opacity: 0.7; }

.nav-cta {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--white);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--black) !important;
  font-size: 0.85rem; font-weight: 600;
  transition: background 0.25s ease !important;
}
.nav-cta:hover { background: var(--grey-1) !important; }

/* BUTTONS */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.95rem 2.25rem; background: var(--white); color: var(--black);
  font-size: 0.95rem; font-weight: 600; letter-spacing: 0.02em;
  border-radius: var(--radius-sm); border: 1px solid var(--white); cursor: pointer;
  transition: background var(--transition), color var(--transition), transform 0.2s ease;
}
.btn-primary:hover { background: transparent; color: var(--white); transform: translateY(-2px); }
.btn-large { padding: 1.1rem 2.75rem; font-size: 1rem; }

.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.95rem 2.25rem; background: transparent; color: var(--grey-2);
  font-size: 0.95rem; font-weight: 500; letter-spacing: 0.02em;
  border-radius: var(--radius-sm); border: 1px solid var(--grey-4); cursor: pointer;
  transition: border-color var(--transition), color var(--transition), transform 0.2s ease;
}
.btn-ghost:hover { border-color: var(--grey-2); color: var(--white); transform: translateY(-2px); }

/* LAYOUT */
.calc-wrap {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 7rem 0 4rem;
}

.calc-head { text-align: center; margin-bottom: 2.75rem; }
.calc-tag {
  display: inline-block; font-size: 0.72rem; font-weight: 600; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--grey-3); margin-bottom: 1.25rem;
}
.calc-title {
  font-size: clamp(2rem, 6vw, 3.25rem); font-weight: 800; line-height: 1.08;
  letter-spacing: -0.03em; margin-bottom: 1rem;
  background: linear-gradient(180deg, #ffffff 0%, #8a8a8a 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.calc-sub { font-size: 1rem; color: var(--grey-2); max-width: 480px; margin: 0 auto; }

/* CARD */
.calc-card {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2.25rem;
}

.field { margin-bottom: 1.75rem; }
.field:last-of-type { margin-bottom: 2rem; }
.field label {
  display: block; font-size: 0.9rem; font-weight: 500; color: var(--grey-1);
  margin-bottom: 0.6rem;
}
.field .hint { font-size: 0.78rem; color: var(--grey-3); font-weight: 400; }

.input-wrap { position: relative; display: flex; align-items: center; }
.input-prefix {
  position: absolute; left: 1rem; color: var(--grey-3);
  font-size: 1rem; font-weight: 500; pointer-events: none;
}
.calc-card input[type="number"] {
  width: 100%;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--white);
  font-family: var(--font);
  font-size: 1.05rem; font-weight: 500;
  padding: 0.95rem 1rem;
  transition: border-color 0.25s ease, background 0.25s ease;
  -moz-appearance: textfield;
}
.calc-card input.has-prefix { padding-left: 2.1rem; }
.calc-card input::-webkit-outer-spin-button,
.calc-card input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.calc-card input::placeholder { color: var(--grey-4); }
.calc-card input:focus {
  outline: none; border-color: var(--grey-2); background: #1a1a1a;
}

/* RESULT */
.result {
  margin-top: 2rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.result-row {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 0.65rem 0;
}
.result-row .label { font-size: 0.9rem; color: var(--grey-2); }
.result-row .value { font-size: 1.15rem; font-weight: 600; color: var(--white); letter-spacing: -0.01em; }

.loss-box {
  margin-top: 1.5rem;
  background: rgba(255,90,69,0.06);
  border: 1px solid rgba(255,90,69,0.25);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  text-align: center;
}
.loss-label {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--loss-dim); margin-bottom: 0.6rem;
}
.loss-value {
  font-size: clamp(2.4rem, 9vw, 3.4rem); font-weight: 800; line-height: 1;
  letter-spacing: -0.03em; color: var(--loss);
}
.loss-per { font-size: 0.85rem; color: var(--grey-3); margin-top: 0.5rem; }

.assumptions {
  font-size: 0.82rem; color: var(--grey-3); line-height: 1.6;
  margin-top: 1.5rem; text-align: center; max-width: 440px; margin-left: auto; margin-right: auto;
}

.calc-cta { margin-top: 2rem; text-align: center; }
.calc-cta .btn-primary { width: 100%; max-width: 340px; }

.result[hidden] { display: none; }

/* FOOTER */
.calc-footer {
  text-align: center; padding: 2.5rem 0 1rem;
  font-size: 0.78rem; color: var(--grey-3);
  position: relative; z-index: 1;
}

@media (max-width: 640px) {
  #navbar { padding: 1.25rem 1.25rem; }
  .calc-card { padding: 2rem 1.5rem; }
  .calc-wrap { padding: 6rem 0 3rem; }
}