/* Tenis Buddy — public site (tenisbuddy-site)
 *
 * Bağımlılık yok, build adımı yok, tek dosya.
 * Design kit: minimal-clarity — sade yüzeyler, hairline border, tek accent,
 * küçük radius, gradyan yok.
 * Marka paleti uygulamadan gelir: navy #0B1B3A (splash) + tenis topu accent.
 */

:root {
  /* --- kit: renk --- */
  --color-bg: oklch(99% 0 0);
  --color-surface: oklch(98% 0.002 260);
  --color-fg: oklch(20% 0.02 260);
  --color-muted: oklch(55% 0.02 260);
  --color-primary: oklch(23% 0.055 264);
  --color-accent: oklch(90% 0.19 118);
  --color-border: oklch(92% 0.004 260);
  --color-on-primary: oklch(99% 0 0);
  --color-accent-ink: oklch(28% 0.08 118);

  /* --- kit: radius --- */
  --radius-sm: 0.165rem;
  --radius-md: 0.33rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.665rem;

  /* --- kit: space --- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;

  /* --- kit: type --- */
  --font-sans: Inter, Geist, system-ui, -apple-system, "Segoe UI", Roboto,
    "Noto Sans", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;
  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
  --tracking-tight: -0.01em;

  /* --- kit: effect --- */
  --shadow-1: 0 1px 2px oklch(0% 0 0 / 6%);
  --shadow-2: 0 2px 8px oklch(0% 0 0 / 8%);
  --duration-fast: 120ms;
  --duration-base: 200ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  --wrap: 68rem;
  --gutter: clamp(1rem, 4vw, 2rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: oklch(18% 0.01 260);
    --color-surface: oklch(22% 0.012 260);
    --color-fg: oklch(95% 0.01 260);
    --color-muted: oklch(68% 0.02 260);
    --color-primary: oklch(30% 0.06 264);
    --color-accent: oklch(88% 0.18 118);
    --color-border: oklch(30% 0.012 260);
    --color-accent-ink: oklch(24% 0.08 118);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: var(--leading-relaxed);
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  inset-inline-start: -9999px;
  inset-block-start: 0;
  z-index: 100;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
}

.skip-link:focus {
  inset-inline-start: var(--space-4);
  inset-block-start: var(--space-4);
}

/* ---------------------------------------------------------------- header */

.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 20;
  background: var(--color-bg);
  border-block-end: 1px solid var(--color-border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-block-size: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
  text-decoration: none;
}

.brand-mark {
  inline-size: 1.75rem;
  block-size: 1.75rem;
  border-radius: var(--radius-xl);
  background: var(--color-accent);
  box-shadow: inset -2px -2px 0 oklch(0% 0 0 / 12%);
  flex: none;
}

.site-nav {
  margin-inline-start: auto;
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2.5vw, 1.5rem);
  font-size: 0.875rem;
  font-weight: 500;
}

.site-nav a {
  color: var(--color-muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--color-fg);
}

/* --------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-block-size: 2.5rem;
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-primary:hover {
  background: oklch(from var(--color-primary) calc(l + 6%) c h);
  color: var(--color-on-primary);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn-accent:hover {
  background: oklch(from var(--color-accent) calc(l - 5%) c h);
  color: var(--color-accent-ink);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-fg);
}

.btn-ghost:hover {
  background: var(--color-surface);
  color: var(--color-fg);
}

/* ------------------------------------------------------------------ hero */

.hero {
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

.hero .eyebrow {
  color: var(--color-accent);
}

.hero h1 {
  margin: 0 0 var(--space-4);
  font-size: clamp(1.875rem, 4.6vw, 2.75rem);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  max-inline-size: 20ch;
}

.hero .lede {
  margin: 0 0 var(--space-8);
  max-inline-size: 58ch;
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: oklch(from var(--color-on-primary) l c h / 78%);
}

.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero .btn-ghost {
  border-color: oklch(from var(--color-on-primary) l c h / 30%);
  color: var(--color-on-primary);
}

.hero .btn-ghost:hover {
  background: oklch(from var(--color-on-primary) l c h / 10%);
  color: var(--color-on-primary);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 var(--space-4);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* -------------------------------------------------------------- sections */

.section {
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.section-soft {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.section h2 {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.375rem, 3vw, 1.875rem);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.section-intro {
  margin: 0 0 var(--space-8);
  max-inline-size: 62ch;
  color: var(--color-muted);
}

.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.card-icon {
  display: grid;
  place-items: center;
  inline-size: 2.25rem;
  block-size: 2.25rem;
  margin-block-end: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: 1.0625rem;
}

.steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
}

.steps li {
  counter-increment: step;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.steps li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  inline-size: 1.75rem;
  block-size: 1.75rem;
  margin-block-end: var(--space-3);
  border-radius: var(--radius-xl);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 0.8125rem;
  font-weight: 600;
}

.steps h3 {
  margin: 0 0 var(--space-1);
  font-size: 1rem;
  font-weight: 600;
}

.steps p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.faq {
  display: grid;
  gap: var(--space-2);
  max-inline-size: 48rem;
}

.faq details {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
}

.faq summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--color-fg);
}

.faq p {
  margin: var(--space-3) 0 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* ------------------------------------------------------------ text pages */

.page-head {
  background: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
  padding-block: clamp(2rem, 5vw, 3rem);
}

.page-head h1 {
  margin: 0 0 var(--space-2);
  font-size: clamp(1.625rem, 3.8vw, 2.25rem);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.page-head p {
  margin: 0;
  color: var(--color-muted);
}

.prose {
  max-inline-size: 46rem;
  padding-block: clamp(2rem, 5vw, 3rem);
}

.prose h2 {
  margin-block: var(--space-8) var(--space-3);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.prose h2:first-child {
  margin-block-start: 0;
}

.prose h3 {
  margin-block: var(--space-6) var(--space-2);
  font-size: 1.0625rem;
  font-weight: 600;
}

.prose p {
  margin-block: 0 var(--space-4);
}

.prose ul,
.prose ol {
  margin-block: 0 var(--space-4);
  padding-inline-start: 1.25rem;
}

.prose li {
  margin-block-end: var(--space-2);
}

.prose li:last-child {
  margin-block-end: 0;
}

.prose table {
  inline-size: 100%;
  border-collapse: collapse;
  margin-block: var(--space-4);
  font-size: 0.9375rem;
}

.prose th,
.prose td {
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
  text-align: start;
  vertical-align: top;
}

.prose th {
  background: var(--color-surface);
  font-weight: 600;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.35em;
}

.callout {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-inline-start: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-6);
  margin-block: var(--space-6);
}

.callout p:last-child {
  margin-block-end: 0;
}

.meta-note {
  color: var(--color-muted);
  font-size: 0.875rem;
}

.toc {
  margin: 0 0 var(--space-8);
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.toc h2 {
  margin: 0 0 var(--space-2);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.toc ol {
  margin: 0;
  padding-inline-start: 1.15rem;
  font-size: 0.9375rem;
}

.toc li {
  margin-block-end: var(--space-1);
}

/* -------------------------------------------------------- invite landing */

.invite-shell {
  min-block-size: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-8) var(--gutter);
  background: var(--color-primary);
}

.invite-card {
  inline-size: 100%;
  max-inline-size: 30rem;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  padding: clamp(1.5rem, 5vw, 2.5rem);
  text-align: center;
}

.invite-card .brand {
  justify-content: center;
  margin-block-end: var(--space-6);
}

.invite-card h1 {
  margin: 0 0 var(--space-2);
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.invite-card > p {
  margin: 0 0 var(--space-6);
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.invite-card .actions {
  display: grid;
  gap: var(--space-2);
}

.invite-status {
  margin-block-end: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  text-align: start;
}

.invite-status[data-kind="info"] {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

.invite-status[data-kind="warn"] {
  background: oklch(97% 0.045 85);
  border: 1px solid oklch(88% 0.08 85);
  color: oklch(38% 0.08 85);
}

.token-preview {
  margin-block-end: var(--space-4);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-muted);
  overflow-wrap: anywhere;
}

.invite-foot {
  margin-block-start: var(--space-6);
  padding-block-start: var(--space-4);
  border-block-start: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- footer */

.site-footer {
  background: var(--color-primary);
  color: oklch(from var(--color-on-primary) l c h / 72%);
  padding-block: var(--space-8);
  font-size: 0.875rem;
}

.site-footer a {
  color: oklch(from var(--color-on-primary) l c h / 88%);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-on-primary);
  text-decoration: underline;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-12);
  align-items: flex-start;
  justify-content: space-between;
}

.site-footer .brand {
  color: var(--color-on-primary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-note {
  margin: var(--space-6) 0 0;
  padding-block-start: var(--space-6);
  border-block-start: 1px solid oklch(from var(--color-on-primary) l c h / 14%);
  color: oklch(from var(--color-on-primary) l c h / 55%);
  font-size: 0.8125rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}