/* ChatGPT Ads — design system v1 (2026-07-16)
   Full dark, focused landing. Sibling of ai-advertising.com.au but its own skin. */

:root {
  --bg: #07090f;
  --bg-2: #0c1018;
  --panel: #10151f;
  --ink: #eef1f7;
  --ink-2: #a9b1c3;
  --ink-3: #77809a;
  --line: rgba(148, 163, 200, .16);
  --green: #17c37b;
  --green-2: #0ea56a;
  --glow: rgba(23, 195, 123, .22);
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1000px 500px at 80% -5%, rgba(23, 195, 123, .10), transparent 60%),
    radial-gradient(900px 600px at 0% 10%, rgba(56, 89, 179, .12), transparent 55%),
    var(--bg);
  line-height: 1.68;
  font-size: clamp(1rem, .96rem + .2vw, 1.0625rem);
  -webkit-font-smoothing: antialiased;
}

.skip { position: absolute; left: -9999px; top: 0; z-index: 100; background: var(--green); color: #04140c; padding: .6rem 1rem; }
.skip:focus { left: 0; }

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2rem); }

h1, h2, h3 { line-height: 1.14; letter-spacing: -.02em; font-weight: 760; color: #fff; text-wrap: balance; }
h1 { font-size: clamp(2.2rem, 1.4rem + 3.8vw, 3.9rem); }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 1rem + .5vw, 1.3rem); }
p, li { max-width: 66ch; }
a { color: #5ee6ae; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #8ff0c6; }
:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; border-radius: 4px; }
strong { color: #fff; font-weight: 650; }

.kicker { display: inline-block; font-size: .78rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; color: var(--green); margin-bottom: .9rem; }

/* header */
.site-head { position: sticky; top: 0; z-index: 50; background: rgba(7, 9, 15, .82); backdrop-filter: saturate(150%) blur(14px); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: 1.4rem; min-height: 64px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 800; font-size: 1.06rem; color: #fff; text-decoration: none; }
.brand svg { width: 28px; height: 28px; flex: none; }
.nav { margin-left: auto; display: flex; align-items: center; gap: clamp(.7rem, 2vw, 1.4rem); }
.nav a { color: var(--ink-2); text-decoration: none; font-weight: 550; font-size: .94rem; }
.nav a:hover { color: #fff; }
.nav .cta { color: #04140c; background: linear-gradient(120deg, var(--green), #3fd598); padding: .55rem 1.05rem; border-radius: 999px; font-weight: 700; box-shadow: 0 4px 18px var(--glow); }
.nav .cta:hover { filter: brightness(1.08); color: #04140c; }
@media (max-width: 700px) { .nav a:not(.cta) { display: none; } }

/* hero */
.hero { padding: clamp(4rem, 11vw, 8rem) 0 clamp(3rem, 7vw, 5rem); position: relative; }
.hero .lede { font-size: clamp(1.08rem, 1rem + .6vw, 1.32rem); color: var(--ink-2); max-width: 58ch; margin: 1.4rem 0 2.3rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .9rem; align-items: center; }
.hero-note { font-size: .88rem; color: var(--ink-3); margin-top: 1.1rem; }

.btn { display: inline-block; font-weight: 700; text-decoration: none; text-align: center; padding: .95rem 1.75rem; border-radius: 999px; font-size: 1.02rem; transition: transform .15s ease, filter .15s ease; }
.btn-primary { background: linear-gradient(120deg, var(--green), #3fd598); color: #04140c; box-shadow: 0 8px 30px var(--glow); }
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.07); color: #04140c; }
.btn-ghost { color: var(--ink); border: 1px solid var(--line); background: rgba(255,255,255,.03); }
.btn-ghost:hover { border-color: rgba(94, 230, 174, .5); color: #fff; }

/* chat mock */
.chat {
  margin-top: 3.2rem; max-width: 620px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); box-shadow: 0 24px 70px rgba(0, 0, 0, .5); overflow: hidden;
}
.chat-bar { padding: .7rem 1rem; border-bottom: 1px solid var(--line); font-size: .8rem; color: var(--ink-3); display: flex; gap: .45rem; align-items: center; }
.chat-bar i { width: 9px; height: 9px; border-radius: 50%; background: #2a3040; display: inline-block; }
.chat-body { padding: 1.2rem; display: grid; gap: 1rem; font-size: .95rem; }
.msg { padding: .8rem 1rem; border-radius: 12px; max-width: 92%; }
.msg.user { background: #1a2130; justify-self: end; color: var(--ink); }
.msg.ai { background: #0d1a14; border: 1px solid rgba(23, 195, 123, .25); color: var(--ink-2); }
.msg.ai b { color: #8ff0c6; }
.cursor { display: inline-block; width: 8px; height: 1em; background: #8ff0c6; vertical-align: text-bottom; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* sections */
.section { padding: clamp(3rem, 8vw, 5.2rem) 0; }
.section.line-top { border-top: 1px solid var(--line); }
.section-head { max-width: 740px; margin-bottom: clamp(1.6rem, 4vw, 2.6rem); }
.section-head p { color: var(--ink-2); margin-top: .8rem; font-size: 1.05rem; }

.grid { display: grid; gap: 1.2rem; }
.grid.c2 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.grid.c3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem 1.5rem; }
.card h3 { margin-bottom: .55rem; }
.card p { color: var(--ink-2); font-size: .97rem; }
.card ul { padding-left: 1.15rem; color: var(--ink-2); font-size: .96rem; display: grid; gap: .45rem; margin-top: .8rem; }
.card .num { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; background: linear-gradient(135deg, var(--green), var(--green-2)); color: #04140c; font-weight: 800; margin-bottom: .9rem; }

/* steps */
.steps { counter-reset: step; display: grid; gap: 1rem; max-width: 760px; }
.step { display: grid; grid-template-columns: 46px 1fr; gap: 1.1rem; align-items: start; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem 1.4rem; }
.step::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, var(--green), var(--green-2)); color: #04140c; font-weight: 800; }
.step h3 { margin-bottom: .3rem; }
.step p { color: var(--ink-2); font-size: .97rem; }

/* FAQ */
.faq { display: grid; gap: .8rem; max-width: 800px; }
.faq details { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.faq summary { cursor: pointer; font-weight: 650; color: #fff; padding: 1rem 1.2rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--green); font-size: 1.25rem; flex: none; }
.faq details[open] summary::after { content: "–"; }
.faq .faq-a { padding: 0 1.2rem 1.1rem; color: var(--ink-2); }

/* form */
.form { display: grid; gap: 1rem; }
.form label { font-weight: 600; font-size: .92rem; display: grid; gap: .38rem; color: var(--ink); }
.form input, .form textarea {
  font: inherit; color: var(--ink); background: #0b0f17;
  border: 1px solid rgba(148, 163, 200, .3); border-radius: 10px; padding: .78rem .9rem; width: 100%;
}
.form input:focus, .form textarea:focus { border-color: var(--green); outline: 2px solid var(--glow); }
.form textarea { min-height: 110px; resize: vertical; }
.form button { border: 0; cursor: pointer; }
.form button[aria-busy="true"] { opacity: .65; pointer-events: none; }
.form .fine { font-size: .84rem; color: var(--ink-3); }
.hp { position: absolute !important; left: -9999px !important; height: 0; overflow: hidden; }

/* disclaimer strip */
.disclaimer {
  border: 1px solid var(--line); border-left: 4px solid var(--green);
  background: var(--panel); border-radius: 10px; padding: 1rem 1.2rem;
  font-size: .9rem; color: var(--ink-2); max-width: 800px;
}

/* footer */
.site-foot { border-top: 1px solid var(--line); margin-top: clamp(3rem, 7vw, 4.5rem); }
.site-foot .wrap { padding-top: 2.4rem; padding-bottom: 2.2rem; }
.site-foot p { color: var(--ink-3); font-size: .86rem; max-width: none; }
.site-foot a { color: var(--ink-2); }
.site-foot .links { display: flex; flex-wrap: wrap; gap: 1.2rem; margin-bottom: 1.2rem; font-size: .92rem; }

/* reveal — hidden ONLY when JS is running (html.js), so no-JS users and crawlers see everything */
html.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
html.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { html.js .reveal { opacity: 1; transform: none; } }