/*
 * tool.css - the chrome shared by the standalone single-purpose calculators.
 *
 * These pages are one form, one chart and one modal each, and they looked alike because the same
 * block of CSS was pasted into every one of them. What lives here is what was IDENTICAL across
 * them: the reset, the page frame, the slider, the readout, the modal shell and the buttons.
 *
 * What does NOT live here is each page's own palette and layout - `:root`, `header`, `.control-row`,
 * `.chart-wrap`, `.modal`, `.modal dl` and the narrow-screen block differ per tool and stay in the
 * page. A page's own <style> is parsed AFTER this file, so anything it declares wins on a tie.
 * Keep it that way: moving a page-specific rule in here silently restyles the other tools.
 */

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

body { background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 15px; line-height: 1.6; min-height: 100vh; padding: 2rem 1rem 4rem; }

.container { max-width: 720px; margin: 0 auto; }

header h1 { font-family: var(--mono); font-size: 1.1rem; font-weight: 500; letter-spacing: 0.04em; color: var(--accent); text-transform: uppercase; margin-bottom: 0.25rem; }

header p { font-size: 13px; color: var(--muted); font-weight: 300; }

.controls { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.5rem; margin-bottom: 1.5rem; }

.control-row:last-child { margin-bottom: 0; }

.control-row label { font-size: 13px; color: var(--muted); font-weight: 400; }

input[type="range"] { -webkit-appearance: none; width: 100%; height: 4px; background: var(--surface2); border-radius: 2px; outline: none; cursor: pointer; }

input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--accent); cursor: pointer; border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--accent); }

input[type="range"]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--accent); cursor: pointer; border: 2px solid var(--surface); }

.readout { font-family: var(--mono); font-size: 13px; font-weight: 500; text-align: right; color: var(--text); background: var(--surface2); border: 1px solid var(--border); border-radius: 4px; padding: 3px 8px; }

.chart-title { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); font-family: var(--mono); margin-bottom: 1rem; }

.formula-box { background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 0.875rem 1.25rem; margin-bottom: 2rem; font-family: var(--mono); font-size: 13px; color: var(--muted); }

.formula-box strong { color: var(--text); font-weight: 500; }

footer { margin-top: 2rem; font-size: 12px; color: var(--muted); text-align: center; font-family: var(--mono); }

.help-btn:hover { opacity: 0.85; }

.modal-overlay.open { display: flex; }

.modal-close { position: absolute; top: 1rem; right: 1rem; background: var(--surface2); border: 1px solid var(--border); border-radius: 4px; font-family: var(--mono); font-size: 12px; padding: 3px 10px; cursor: pointer; color: var(--muted); }

.modal-close:hover { color: var(--text); }

.modal h2 { font-family: var(--mono); font-size: 0.95rem; font-weight: 500; letter-spacing: 0.05em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.5rem; }

.modal .modal-lead { font-size: 14px; color: var(--muted); margin-bottom: 1.5rem; line-height: 1.6; }

.modal h3 { font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); border-bottom: 1px solid var(--border); padding-bottom: 4px; margin: 1.25rem 0 0.75rem; }

.modal dt { font-family: var(--mono); font-weight: 500; color: var(--text); padding-top: 2px; }

.modal dd { color: var(--muted); line-height: 1.55; }

.modal .example-box { background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; padding: 0.875rem 1.1rem; font-size: 13px; color: var(--text); line-height: 1.65; margin-top: 0.75rem; }

.modal .example-box strong { font-family: var(--mono); font-weight: 500; }