/* ==========================================================================
   TORVA — a fully mechanical pour-over kettle
   Design world: a backlit technical DATASHEET. The whole product story is
   "mechanical honesty, no app, no battery," so the site is built like the
   spec sheet for one engineered object — dark instrument panel, glowing
   copper, monospace readouts, dotted leader lines, part numbers, and the
   kettle drawn once as line-art that lights up against the dark.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800;900&family=Manrope:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg: #131211;          /* warm graphite, near-black */
  --bg-panel: #1b1917;    /* raised instrument panel */
  --bg-inset: #0c0b0a;    /* recessed / darkest */
  --text: #ece7dc;        /* warm off-white */
  --text-dim: #afa99d;
  --steel: #8c877e;       /* captions, labels */
  --steel-dim: #5d5850;
  --line: #2b2823;        /* hairlines on dark */
  --line-bright: #3a3630;
  --copper: #d17b41;
  --copper-bright: #ec9457;
  --copper-deep: #a85a26;

  --font-display: 'Archivo', 'Arial Narrow', sans-serif;
  --font-body: 'Manrope', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  --container: 1200px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--font-body); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button, input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }

/* ------------------------------ type -------------------------------- */
.tag {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--copper);
  display: inline-flex; align-items: center; gap: 0.6em;
}
.tag::before { content: '['; color: var(--steel-dim); }
.tag::after { content: ']'; color: var(--steel-dim); }

h1, h2, h3, .h1, .h2, .h3 {
  font-family: var(--font-display); font-weight: 800; letter-spacing: -0.02em;
  line-height: 0.98; text-transform: uppercase; color: var(--text);
}
.h-display { font-size: clamp(3.2rem, 8.4vw, 7.2rem); font-weight: 900; line-height: 0.86; letter-spacing: -0.03em; }
.h-display .out { color: var(--copper); -webkit-text-stroke: 0; text-shadow: 0 0 34px rgba(209,123,65,0.45); }
h2, .h2 { font-size: clamp(2rem, 4vw, 3.2rem); }
h3, .h3 { font-size: 1.4rem; letter-spacing: -0.01em; }

.lede { font-family: var(--font-body); font-size: clamp(1.02rem, 1.4vw, 1.16rem); color: var(--text-dim); max-width: 46ch; line-height: 1.7; font-weight: 400; }
p.body-copy { color: var(--text-dim); max-width: 60ch; }

.section-head { margin-bottom: 3rem; }
.section-head .tag { margin-bottom: 1rem; }

/* ------------------------------ buttons -------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.7rem;
  font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.95rem 1.6rem; border-radius: 2px; border: 1px solid var(--line-bright);
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.btn-primary { background: var(--copper); color: #17130f; border-color: var(--copper); }
.btn-primary:hover { background: var(--copper-bright); border-color: var(--copper-bright); box-shadow: 0 0 30px -6px rgba(209,123,65,0.6); }
.btn-ghost { background: transparent; color: var(--text); }
.btn-ghost:hover { border-color: var(--copper); color: var(--copper-bright); }

/* ------------------------------ nav -------------------------------- */
.site-header { position: sticky; top: 0; z-index: 40; background: rgba(19,18,17,0.86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; padding-block: 0.9rem; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; }
.brand-word { font-family: var(--font-display); font-size: 1.4rem; font-weight: 900; letter-spacing: 0.06em; }
.brand-word .reg { color: var(--copper); }
.nav-mid { flex: 1; display: flex; align-items: center; gap: 2rem; justify-content: center; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a:not(.btn) { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--steel); position: relative; padding-block: 0.3rem; transition: color 0.25s var(--ease); }
.nav-links a:not(.btn)::before { content: ''; position: absolute; left: 0; top: -0.9rem; width: 0; height: 2px; background: var(--copper); transition: width 0.3s var(--ease); }
.nav-links a:not(.btn):hover, .nav-links a[aria-current="page"] { color: var(--text); }
.nav-links a:not(.btn):hover::before, .nav-links a[aria-current="page"]::before { width: 100%; }
.nav-readout { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.05em; color: var(--steel-dim); white-space: nowrap; }
.nav-readout b { color: var(--steel); font-weight: 500; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line-bright); width: 42px; height: 42px; border-radius: 2px; align-items: center; justify-content: center; color: var(--text); }
.nav-toggle svg { width: 18px; height: 18px; }
@media (max-width: 940px) { .nav-readout { display: none; } }
@media (max-width: 860px) {
  .nav-links { position: fixed; inset: 62px 0 auto 0; background: var(--bg-panel); flex-direction: column; align-items: flex-start; padding: 1.8rem var(--gutter); gap: 1.4rem; transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity 0.3s var(--ease), transform 0.3s var(--ease); border-bottom: 1px solid var(--line); }
  .nav-links.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav-links a:not(.btn)::before { display: none; }
  .nav-toggle { display: inline-flex; }
}

/* ------------------------------ reveal -------------------------------- */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js .reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ------------------------------ sections -------------------------------- */
section { padding-block: clamp(3.6rem, 8vw, 6.5rem); }
.bg-panel { background: var(--bg-panel); }
.bg-inset { background: var(--bg-inset); }

/* ------------------------------ hero -------------------------------- */
.hero { position: relative; overflow: hidden; padding-top: clamp(2.5rem, 6vw, 4.5rem); padding-bottom: clamp(2.5rem, 6vw, 4.5rem); }
.hero::before {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 46px 46px; opacity: 0.35;
  -webkit-mask-image: radial-gradient(120% 90% at 70% 40%, #000 30%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 70% 40%, #000 30%, transparent 78%);
}
.hero::after {
  content: ''; position: absolute; z-index: 0; pointer-events: none;
  width: 60vw; height: 60vw; max-width: 640px; max-height: 640px; right: -6%; top: 50%; transform: translateY(-50%);
  background: radial-gradient(circle, rgba(209,123,65,0.20), rgba(209,123,65,0) 62%);
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.08fr 0.92fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.hero-copy .tag { margin-bottom: 1.5rem; }
.hero-copy h1 { margin-bottom: 1.6rem; }
.hero-copy .lede { margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.hero-diagram { position: relative; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } .hero-diagram { order: -1; max-width: 420px; margin-inline: auto; } }

/* ------------------------------ diagram -------------------------------- */
.kettle-diagram { width: 100%; max-width: 470px; margin-inline: auto; }
.kettle-diagram .line { fill: none; stroke: var(--text); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.kettle-diagram .fill-copper { fill: var(--copper); filter: drop-shadow(0 0 6px rgba(209,123,65,0.85)); }
.kettle-diagram .fill-steel { fill: var(--steel); opacity: 0.2; }
.kettle-diagram .callout-line { stroke: var(--steel-dim); stroke-width: 1; stroke-dasharray: 2 3; }
.kettle-diagram .callout-dot { fill: var(--copper); }
.kettle-diagram .callout-text { font-family: var(--font-mono); font-size: 8.4px; fill: var(--steel); letter-spacing: 0.01em; }
.kettle-diagram .callout-text tspan.num { fill: var(--copper-bright); font-weight: 700; }

/* ------------------------------ spec strip -------------------------------- */
.spec-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-inset); }
.spec-strip .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.spec-item { padding: 1.8rem 1.6rem; border-left: 1px solid var(--line); position: relative; }
.spec-item:first-child { border-left: none; }
.spec-item .num { display: block; font-family: var(--font-display); font-size: 2.5rem; font-weight: 800; line-height: 1; }
.spec-item .num .unit { color: var(--copper); font-size: 0.5em; }
.spec-item .label { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--steel); margin-top: 0.6rem; display: block; }
.spec-item .idx { position: absolute; top: 0.9rem; right: 1.1rem; font-family: var(--font-mono); font-size: 0.62rem; color: var(--steel-dim); }
@media (max-width: 760px) { .spec-strip .container { grid-template-columns: 1fr 1fr; } .spec-item:nth-child(3) { border-left: none; } .spec-item:nth-child(2n) { border-left: 1px solid var(--line); } .spec-item:nth-child(n+3) { border-top: 1px solid var(--line); } }

/* ------------------------------ feature rows -------------------------------- */
.feature-row { display: grid; grid-template-columns: 0.42fr 1fr 1fr; gap: 2rem; padding-block: 2.4rem; border-top: 1px solid var(--line); align-items: start; }
.feature-list .feature-row:last-child { border-bottom: 1px solid var(--line); }
.feature-row .fnum { font-family: var(--font-mono); font-size: 0.8rem; font-weight: 700; color: var(--copper); letter-spacing: 0.05em; padding-top: 0.4rem; }
.feature-row h4 { font-family: var(--font-display); font-size: 1.35rem; font-weight: 700; text-transform: none; letter-spacing: -0.01em; }
.feature-row p { color: var(--text-dim); font-size: 0.96rem; max-width: 46ch; }
@media (max-width: 760px) { .feature-row { grid-template-columns: 1fr; gap: 0.7rem; } }

/* ------------------------------ order plate -------------------------------- */
.plate { position: relative; border: 1px solid var(--line-bright); background:
  linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.15)), var(--bg-panel);
  padding: clamp(2rem, 5vw, 3.6rem); border-radius: 3px;
}
.plate::before { content: ''; position: absolute; inset: 8px; border: 1px solid var(--line); border-radius: 2px; pointer-events: none; }
.plate-inner { position: relative; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 2rem; }
.plate .partno { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--steel); margin-bottom: 1rem; }
.plate h2 { max-width: 16ch; }
.order-actions { display: flex; gap: 1.2rem; align-items: center; flex-wrap: wrap; }
.order-price { font-family: var(--font-display); font-size: 2.4rem; font-weight: 800; }
.order-price .cur { color: var(--copper); font-size: 0.6em; vertical-align: 0.35em; }

/* ------------------------------ footer -------------------------------- */
.site-footer { background: var(--bg-inset); border-top: 1px solid var(--line); padding-block: 3.4rem 2rem; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 3rem; padding-bottom: 2.6rem; }
.footer-brand .brand-word { font-size: 1.6rem; }
.footer-tagline { font-family: var(--font-mono); font-size: 0.74rem; line-height: 1.7; color: var(--steel); margin-top: 1rem; max-width: 34ch; }
.footer-col h4 { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--steel-dim); margin-bottom: 1.1rem; }
.footer-col ul { display: flex; flex-direction: column; gap: 0.7rem; }
.footer-col a { font-size: 0.9rem; color: var(--text-dim); }
.footer-col a:hover { color: var(--copper-bright); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; padding-top: 1.6rem; border-top: 1px solid var(--line); font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.03em; color: var(--steel-dim); }
@media (max-width: 760px) { .footer-top { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1 / -1; } }
@media (max-width: 480px) { .footer-top { grid-template-columns: 1fr; gap: 1.8rem; } }

/* ------------------------------ demo banner -------------------------------- */
.demo-banner { background: var(--bg-inset); color: var(--steel); text-align: center; padding: 0.5rem 1rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.03em; border-bottom: 1px solid var(--line); }
.demo-banner a { color: var(--copper); text-decoration: none; border-bottom: 1px solid var(--copper-deep); }
.framed .demo-banner { display: none; }

/* ------------------------------ details page -------------------------------- */
.page-head { border-bottom: 1px solid var(--line); }
.page-head .tag { margin-bottom: 1.1rem; }
.details-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table tr { border-top: 1px solid var(--line); }
.spec-table tr:last-child { border-bottom: 1px solid var(--line); }
.spec-table th, .spec-table td { text-align: left; padding: 0.95rem 0.5rem; vertical-align: top; }
.spec-table th { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--steel); font-weight: 500; width: 42%; }
.spec-table td { font-family: var(--font-body); font-weight: 600; color: var(--text); }
@media (max-width: 860px) { .details-grid { grid-template-columns: 1fr; } }

.materials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.material-card { background: var(--bg-panel); border: 1px solid var(--line); padding: 1.8rem; border-radius: 3px; }
.material-card .swatch { width: 100%; height: 70px; margin-bottom: 1.4rem; border-radius: 2px; border: 1px solid var(--line-bright); }
.material-card h4 { font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; text-transform: none; margin-bottom: 0.6rem; }
.material-card p { color: var(--text-dim); font-size: 0.88rem; }
@media (max-width: 860px) { .materials-grid { grid-template-columns: 1fr; } }

/* ------------------------------ faq page -------------------------------- */
.faq-item { border-top: 1px solid var(--line); padding-block: 1.9rem; display: grid; grid-template-columns: 0.28fr 1fr; gap: 1.4rem; }
.faq-list .faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item .qno { font-family: var(--font-mono); font-size: 0.72rem; color: var(--steel-dim); padding-top: 0.3rem; }
.faq-item h4 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; text-transform: none; margin-bottom: 0.7rem; letter-spacing: -0.01em; }
.faq-item p { color: var(--text-dim); max-width: 62ch; }
@media (max-width: 640px) { .faq-item { grid-template-columns: 1fr; gap: 0.4rem; } }