:root { --bg: #f7faf9; --card: #ffffff; --text: #17211e; --muted: #5b6b66; --accent: #2e7d6b; --on-accent: #ffffff; --streak: #f57c00; --line: #dfe7e4; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #101514; --card: #18201e; --text: #e6efec; --muted: #9aaba6; --accent: #6fcdb6; --on-accent: #06231c; --line: #26322f; }
}
* { box-sizing: border-box; }
html[lang="en"] [data-lang="tr"], html[lang="tr"] [data-lang="en"] { display: none; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; padding-bottom: 20px; }
.brand { font-weight: 700; font-size: 20px; color: var(--accent); text-decoration: none; }
#lang-toggle { background: none; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); padding: 6px 14px; font: inherit; font-size: 14px; cursor: pointer; }
a { color: var(--accent); }
h1 { font-size: 34px; line-height: 1.2; margin: 24px 0 12px; text-wrap: balance; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 22px; }
.lead { font-size: 19px; color: var(--muted); }
.note { color: var(--muted); font-size: 15px; }
.hero { padding: 32px 0 8px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 24px 0; }
.cards div { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.cards h2 { margin: 0 0 6px; font-size: 17px; }
.cards p { margin: 0; color: var(--muted); font-size: 15px; }
.join { text-align: center; }
.code { font: 700 30px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 4px; color: var(--streak); min-height: 36px; margin: 20px 0; overflow-wrap: anywhere; }
.button { display: inline-block; background: var(--accent); color: var(--on-accent); text-decoration: none; font-weight: 600; padding: 14px 26px; border-radius: 12px; }
footer { display: flex; flex-wrap: wrap; gap: 20px; padding-top: 28px; padding-bottom: 40px; margin-top: 40px; border-top: 1px solid var(--line); font-size: 15px; }