/* ============================================================
   METALLAI — free tool pages
   Shared shell so a new calculator is a single HTML file.
   Brand tokens are copied from the homepage; keep them in sync.
   ============================================================ */

:root {
    --navy-900: #07132A;
    --navy-800: #0B1A2E;
    --navy-700: #0F1B3D;
    --cyan-400: #29B6F6;
    --cyan-500: #0EA5E9;
    --cyan-600: #0284C7;
    --gold-400: #FFD700;
    --ink-900: #0A0F1E;
    --ink-700: #334155;
    --ink-500: #64748B;
    --ink-400: #94A3B8;
    --paper: #F8FAFC;
    --paper-cool: #F1F5F9;
    --line: #E2E8F0;
    --good: #059669;
    --warn: #B45309;
    --bad: #DC2626;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
                 Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--ink-900);
    background: #fff;
    -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 24px; }

/* ---------------------------------------------------------- header */
.t-header {
    background: var(--navy-900);
    padding: 14px 0;
    position: sticky; top: 0; z-index: 50;
}
.t-header .wrap { display: flex; align-items: center; gap: 20px; }
.t-logo {
    color: #fff; font-weight: 800; letter-spacing: 0.04em;
    text-decoration: none; font-size: 1.05rem;
}
.t-logo span { color: var(--cyan-400); }
.t-nav { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.t-nav a { color: var(--ink-400); text-decoration: none; font-size: 0.9rem; }
.t-nav a:hover { color: #fff; }
.t-cta {
    background: var(--gold-400); color: var(--navy-900) !important;
    padding: 9px 18px; border-radius: 8px; font-weight: 700; font-size: 0.88rem;
}
.t-cta:hover { background: #FFE04D; }

/* ---------------------------------------------------------- hero */
.t-hero { padding: 54px 0 34px; border-bottom: 1px solid var(--line); }
.t-crumb { font-size: 0.82rem; color: var(--ink-500); margin-bottom: 16px; }
.t-crumb a { color: var(--cyan-600); text-decoration: none; }
.t-hero h1 {
    font-size: clamp(1.9rem, 4vw, 2.6rem); line-height: 1.15;
    letter-spacing: -0.02em; margin-bottom: 16px;
}
.t-hero p.lead { font-size: 1.06rem; color: var(--ink-700); max-width: 66ch; }

/* ---------------------------------------------------------- calculator */
.calc { padding: 40px 0 10px; }
.calc-grid { display: grid; gap: 28px; grid-template-columns: 1.25fr 1fr; align-items: start; }
@media (max-width: 860px) { .calc-grid { grid-template-columns: 1fr; } }

.panel {
    border: 1px solid var(--line); border-radius: 14px;
    padding: 26px 24px; background: #fff;
}
.panel h2 { font-size: 1.08rem; margin-bottom: 4px; }
.panel .hint { font-size: 0.85rem; color: var(--ink-500); margin-bottom: 20px; }

.el-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); }
.el { display: flex; flex-direction: column; gap: 5px; }
.el label { font-size: 0.78rem; font-weight: 700; color: var(--ink-700); letter-spacing: 0.02em; }
.el input {
    width: 100%; padding: 9px 10px; font-size: 0.95rem;
    border: 1px solid var(--line); border-radius: 8px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    background: var(--paper);
}
.el input:focus { outline: 2px solid var(--cyan-400); outline-offset: -1px; background: #fff; }

.presets { margin-top: 22px; }
.presets .plabel {
    font-size: 0.78rem; font-weight: 700; color: var(--ink-500);
    letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 10px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
    border: 1px solid var(--line); background: var(--paper-cool);
    border-radius: 999px; padding: 7px 14px; font-size: 0.84rem;
    cursor: pointer; color: var(--ink-700); font-weight: 600;
}
.chip:hover { border-color: var(--cyan-400); color: var(--cyan-600); background: #fff; }

/* ---------------------------------------------------------- result */
.result { background: var(--navy-900); color: #fff; border: none; }
.result h2 { color: #fff; }
.result .hint { color: var(--ink-400); }
.big {
    font-size: 3.1rem; font-weight: 800; letter-spacing: -0.03em;
    line-height: 1.05; color: var(--cyan-400);
}
.big small { font-size: 0.95rem; font-weight: 600; color: var(--ink-400); letter-spacing: 0; }
.verdict {
    display: inline-block; margin-top: 14px; padding: 7px 15px;
    border-radius: 999px; font-size: 0.84rem; font-weight: 700;
}
.v-good { background: rgba(5,150,105,0.18); color: #6EE7B7; }
.v-warn { background: rgba(180,83,9,0.22);  color: #FCD34D; }
.v-bad  { background: rgba(220,38,38,0.20); color: #FCA5A5; }
.result .rec {
    margin-top: 18px; font-size: 0.92rem; color: #CBD5E1; line-height: 1.6;
    border-top: 1px solid rgba(255,255,255,0.12); padding-top: 18px;
}
.subvals { margin-top: 18px; display: grid; gap: 12px; }
.subval { display: flex; justify-content: space-between; align-items: baseline; gap: 14px; }
.subval .k { font-size: 0.86rem; color: var(--ink-400); }
.subval .v {
    font-size: 1.12rem; font-weight: 700; color: #fff;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------------------------------------------------------- content */
.section { padding: 46px 0; border-top: 1px solid var(--line); }
.section h2 { font-size: 1.5rem; letter-spacing: -0.01em; margin-bottom: 14px; }
.section h3 { font-size: 1.05rem; margin: 26px 0 8px; }
.section p { color: var(--ink-700); margin-bottom: 14px; max-width: 74ch; }
.section ul { color: var(--ink-700); margin: 0 0 14px 20px; }
.section li { margin-bottom: 7px; }

.formula {
    background: var(--navy-900); color: #E2E8F0; border-radius: 12px;
    padding: 20px 22px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.95rem; overflow-x: auto; margin: 16px 0 20px; line-height: 1.75;
    /* The formulas are written as laid-out blocks in the HTML. Without this they
       collapse into one running line and stop being readable as equations.
       pre-wrap rather than pre so a long line still wraps on a phone. */
    white-space: pre-wrap;
}
.formula .hl { color: var(--gold-400); }

table.t { width: 100%; border-collapse: collapse; margin: 16px 0 22px; font-size: 0.92rem; }
table.t th, table.t td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--line); }
table.t th { background: var(--paper-cool); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
table.t td.num { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.note {
    background: var(--paper-cool); border-radius: 12px; padding: 20px 22px;
    font-size: 0.92rem; color: var(--ink-700); line-height: 1.65;
}
.note strong { color: var(--ink-900); }

details.faq-q {
    border: 1px solid var(--line); border-radius: 12px;
    margin-bottom: 12px; background: var(--paper);
}
details.faq-q summary {
    cursor: pointer; padding: 17px 20px; font-weight: 650; list-style: none;
    display: flex; justify-content: space-between; gap: 16px;
}
details.faq-q summary::-webkit-details-marker { display: none; }
details.faq-q summary::after { content: "+"; color: var(--cyan-500); font-weight: 700; flex: none; }
details.faq-q[open] summary::after { content: "\2212"; }
details.faq-q .a { padding: 0 20px 18px; color: var(--ink-700); font-size: 0.93rem; line-height: 1.68; }

/* ---------------------------------------------------------- cta + footer */
.t-strip {
    background: linear-gradient(135deg, var(--navy-900), var(--navy-700));
    color: #fff; padding: 44px 0; text-align: center;
}
.t-strip h2 { font-size: 1.6rem; margin-bottom: 10px; }
.t-strip p { color: var(--ink-400); max-width: 60ch; margin: 0 auto 22px; }
.btn {
    display: inline-block; background: var(--gold-400); color: var(--navy-900);
    padding: 13px 28px; border-radius: 10px; font-weight: 700; text-decoration: none;
}
.btn:hover { background: #FFE04D; }
.btn-ghost {
    background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.3);
    margin-left: 10px;
}
.btn-ghost:hover { background: rgba(255,255,255,0.08); }

.t-footer { background: var(--navy-900); color: var(--ink-400); padding: 30px 0; font-size: 0.86rem; }
.t-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.t-footer a { color: var(--ink-400); text-decoration: none; }
.t-footer a:hover { color: #fff; }
.t-footer .right { margin-left: auto; }

/* ---------------------------------------------------------- tools hub */
.tool-cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); margin-top: 30px; }
.tool-card {
    border: 1px solid var(--line); border-radius: 14px; padding: 24px;
    text-decoration: none; color: inherit; display: block; background: #fff;
}
.tool-card:hover { border-color: var(--cyan-400); box-shadow: 0 6px 22px rgba(14,165,233,0.09); }
.tool-card h3 { font-size: 1.08rem; margin-bottom: 8px; color: var(--ink-900); }
.tool-card p { font-size: 0.9rem; color: var(--ink-700); margin: 0; }
.tool-card .tag {
    display: inline-block; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em;
    text-transform: uppercase; color: var(--cyan-600); margin-bottom: 10px;
}
.soon { opacity: 0.55; }
.soon .tag { color: var(--ink-500); }