@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Manrope:wght@400;500;600;700;800&display=swap');

:root { --ink: #17211f; --muted: #6d7975; --paper: #f5f4ef; --white: #fffefa; --mint: #b8e6d5; --green: #12624f; --line: #d8ddd7; --orange: #ef754f; }
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Manrope, sans-serif; }
.topbar { height: 76px; padding: 0 6vw; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); background: rgba(245,244,239,.9); }
.brand { display: flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: -.03em; }
.brand-mark { display: grid; place-items: center; width: 35px; height: 35px; color: var(--white); background: var(--green); font: 500 12px 'DM Mono', monospace; }
.status { color: var(--muted); font: 11px 'DM Mono', monospace; text-transform: uppercase; letter-spacing: .05em; }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 7px; background: var(--orange); border-radius: 50%; }
.page-shell { max-width: 1180px; margin: 0 auto; padding: 72px 6vw 100px; }
.intro { display: flex; justify-content: space-between; gap: 40px; margin-bottom: 58px; animation: rise .6s ease both; }
.eyebrow, .card-index, .note-number { color: var(--orange); font: 500 11px 'DM Mono', monospace; letter-spacing: .1em; text-transform: uppercase; }
h1 { margin: 12px 0 18px; font-size: clamp(42px, 6vw, 78px); line-height: .99; letter-spacing: -.075em; font-weight: 800; }
h1 em { color: var(--green); font-style: normal; }
.intro-copy { max-width: 430px; color: var(--muted); font-size: 16px; line-height: 1.7; }
.intro-note { align-self: flex-end; display: grid; grid-template-columns: auto 44px auto; align-items: center; gap: 12px; color: var(--muted); font: 11px/1.45 'DM Mono', monospace; text-transform: uppercase; }
.note-line { width: 44px; height: 1px; background: var(--orange); }
.tool-tabs { display: flex; overflow-x: auto; border-bottom: 1px solid var(--line); }
.tool-tab { flex: 1 0 auto; padding: 18px 22px 16px 0; margin-right: 34px; color: var(--muted); background: transparent; border: 0; border-bottom: 3px solid transparent; cursor: pointer; font: 600 13px Manrope, sans-serif; text-align: left; }
.tool-tab span { margin-right: 12px; color: var(--orange); font: 11px 'DM Mono', monospace; }
.tool-tab.active { color: var(--ink); border-bottom-color: var(--green); }
.calculator-area { padding-top: 42px; }
.calculator-card { display: grid; grid-template-columns: 1fr 1.4fr .75fr; gap: 40px; align-items: center; padding: 38px; background: var(--white); border: 1px solid var(--line); animation: rise .45s ease both; }
.hidden { display: none; }
.card-heading h2 { margin: 16px 0 8px; font-size: 25px; letter-spacing: -.05em; }
.card-heading p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.calculator-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; align-items: end; }
.calculator-form label { display: flex; flex-direction: column; gap: 8px; color: var(--muted); font: 10px 'DM Mono', monospace; text-transform: uppercase; }
.calculator-form input, .calculator-form select { width: 100%; padding: 13px 12px; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 0; outline: 0; font: 14px Manrope, sans-serif; }
.calculator-form input:focus, .calculator-form select:focus { border-color: var(--green); box-shadow: 0 0 0 2px var(--mint); }
.primary-button { display: flex; justify-content: space-between; align-items: center; min-height: 46px; padding: 0 14px; color: var(--white); background: var(--green); border: 0; cursor: pointer; font: 600 12px Manrope, sans-serif; transition: background .2s, transform .2s; }
.primary-button:hover { background: #0b4b3c; transform: translateY(-2px); }
.result { display: flex; min-height: 112px; padding: 17px; flex-direction: column; justify-content: space-between; background: var(--mint); }
.result small { color: var(--green); font: 10px 'DM Mono', monospace; text-transform: uppercase; }
.result strong { color: var(--green); font-size: 23px; line-height: 1.1; letter-spacing: -.05em; overflow-wrap: anywhere; }
footer { display: flex; justify-content: space-between; padding: 25px 6vw; color: var(--muted); border-top: 1px solid var(--line); font: 10px 'DM Mono', monospace; letter-spacing: .04em; text-transform: uppercase; }
.footer-accent { color: var(--orange); }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 850px) { .calculator-card { grid-template-columns: 1fr; gap: 28px; } .result { min-height: 90px; } }
@media (max-width: 560px) { .topbar { height: 64px; padding: 0 20px; } .status { font-size: 9px; } .page-shell { padding: 48px 20px 65px; } .intro { margin-bottom: 38px; } .intro-note { display: none; } h1 { font-size: 48px; } .tool-tab { margin-right: 22px; padding-right: 0; } .calculator-card { padding: 24px 20px; } .calculator-form { grid-template-columns: 1fr; } footer { padding: 22px 20px; gap: 18px; flex-direction: column; } }