/* ─────────────────────────────────────────────────────────────────────────
   Kahoots — Main Stylesheet
   Warm, minimal, paper-toned design system
   ───────────────────────────────────────────────────────────────────────── */

/* ── Imports ── */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

/* ── Design tokens ── */
:root {
  /* Colors — warm paper palette */
  --color-bg: #f4f1eb;
  --color-bg-warm: #faf8f4;
  --color-surface: #fefdfb;
  --color-surface-2: #edeae3;
  --color-surface-3: #e3dfd8;
  --color-text: #2c2a25;
  --color-text-secondary: #4a4740;
  --color-text-muted: #7a756d;
  --color-text-faint: #a5a09a;
  --color-accent: #5f7a6a;
  --color-accent-hover: #4f6a5a;
  --color-accent-light: rgba(95, 122, 106, 0.07);
  --color-accent-glow: rgba(95, 122, 106, 0.12);
  --color-border: #e3dfd8;
  --color-border-light: #edeae3;
  --color-error: #c4564a;

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", monospace;

  /* Spacing scale (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  /* Layout */
  --max-width: 1060px;
  --max-width-tight: 680px;
  --header-height: 64px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows — very subtle, warm */
  --shadow-xs: 0 1px 2px rgba(44, 42, 37, 0.03);
  --shadow-sm: 0 1px 3px rgba(44, 42, 37, 0.04);
  --shadow-md: 0 2px 8px rgba(44, 42, 37, 0.05);
  --shadow-lg: 0 4px 16px rgba(44, 42, 37, 0.06);

  /* Transitions */
  --transition: 180ms ease;
  --transition-slow: 280ms ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }
ul, ol { list-style: none; }

/* ── Utility ── */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-5); }
.container--tight { max-width: var(--max-width-tight); }

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

.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }

.eyebrow {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  letter-spacing: 0.01em;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-accent-hover);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  border-color: var(--color-text-faint);
  color: var(--color-text);
}

.btn--large { padding: 14px 30px; font-size: 0.95rem; border-radius: var(--radius-md); }
.btn--full { width: 100%; justify-content: center; }

/* ── Header ── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}
.site-header.scrolled {
  background: rgba(244, 241, 235, 0.9);
  backdrop-filter: blur(16px) saturate(1.2);
  border-color: var(--color-border);
}

.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }

/* ── Logo ── */
.logo {
  display: flex; align-items: center; gap: 9px;
  font-weight: 600; font-size: 1.05rem; letter-spacing: -0.01em;
  color: var(--color-text);
}
.logo:hover { opacity: 0.7; }
.logo__icon { width: 22px; height: auto; flex-shrink: 0; }

/* ── Nav ── */
.site-nav { display: flex; align-items: center; gap: var(--space-6); }
.site-nav__links { display: flex; align-items: center; gap: var(--space-5); }
.site-nav__links a {
  font-size: 0.85rem; font-weight: 450; color: var(--color-text-muted);
  transition: color var(--transition);
}
.site-nav__links a:hover { color: var(--color-text); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; padding: var(--space-2); }
.nav-toggle span { display: block; width: 20px; height: 1.5px; background: var(--color-text); border-radius: 2px; transition: var(--transition); }

/* ── Hero ── */
.hero {
  padding-top: calc(var(--header-height) + var(--space-10) + 16px);
  padding-bottom: var(--space-10);
  text-align: center;
}

.hero__content { max-width: 720px; margin: 0 auto; }

.hero__headline {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 700; line-height: 1.15; letter-spacing: -0.03em;
  color: var(--color-text); margin-bottom: var(--space-5);
}
.hero__headline em {
  font-style: italic;
  color: var(--color-accent);
}

.hero__sub {
  font-size: 1.08rem; color: var(--color-text-muted);
  max-width: 520px; margin: 0 auto var(--space-7);
  line-height: 1.75;
}

.hero__cta-group { display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap; }

.hero__scroll-hint {
  margin-top: var(--space-9);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-2);
  color: var(--color-text-faint);
  font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
}

/* ── Stats bar ── */
.stats-bar {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  background: var(--color-surface);
}
.stats-bar__inner { display: flex; justify-content: center; gap: var(--space-9); flex-wrap: wrap; }
.stat { text-align: center; }
.stat__value {
  font-size: 1.6rem; font-weight: 700; color: var(--color-accent);
  letter-spacing: -0.02em; line-height: 1;
}
.stat__label { font-size: 0.78rem; color: var(--color-text-muted); margin-top: var(--space-1); }

/* ── Section shared ── */
.section { padding: var(--space-10) 0; }
.section--alt { background: var(--color-surface); }
.section__header { text-align: center; margin-bottom: var(--space-8); }
.section__title {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.3;
  margin-bottom: var(--space-4); color: var(--color-text);
}
.section__sub {
  font-size: 1rem; color: var(--color-text-muted);
  max-width: 500px; margin: 0 auto; line-height: 1.7;
}

/* ── Problem section ── */
.problem-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-5); }

.problem-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  transition: background var(--transition);
}
.problem-card:hover {
  background: var(--color-surface);
}

.problem-card__icon {
  width: 36px; height: 36px;
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

.problem-card__title { font-size: 1.05rem; font-weight: 600; margin-bottom: var(--space-3); color: var(--color-text); }
.problem-card__body { font-size: 0.88rem; color: var(--color-text-muted); line-height: 1.7; }

/* ── How it works ── */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--space-6); position: relative; }

@media (min-width: 768px) {
  .steps::before {
    content: ""; position: absolute; top: 26px;
    left: calc(16.66% + 20px); right: calc(16.66% + 20px);
    height: 1px;
    background: var(--color-border);
    z-index: 0;
  }
}

.step { text-align: center; position: relative; z-index: 1; }
.step__number {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--color-accent-light);
  border: 1.5px solid var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 0.85rem;
  color: var(--color-accent);
  margin: 0 auto var(--space-5);
}
.step__title { font-size: 1rem; font-weight: 600; margin-bottom: var(--space-3); color: var(--color-text); }
.step__body { font-size: 0.88rem; color: var(--color-text-muted); line-height: 1.7; }

/* ── Features grid ── */
.features-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--space-5); }

.feature-card {
  display: flex; gap: var(--space-4); padding: var(--space-5);
  border-radius: var(--radius-lg);
  transition: background var(--transition);
}
.feature-card:hover { background: var(--color-surface); }

.feature-card__icon {
  flex-shrink: 0; width: 32px; height: 32px;
  color: var(--color-accent);
}

.feature-card__title { font-size: 0.92rem; font-weight: 600; margin-bottom: var(--space-2); color: var(--color-text); }
.feature-card__body { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.7; }

/* ── Pricing ── */
.pricing-wrapper { max-width: 440px; margin: 0 auto; }

.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  text-align: center;
}

.pricing-badge {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: var(--space-5);
}

.pricing-tier { font-size: 0.95rem; font-weight: 500; color: var(--color-text-muted); margin-bottom: var(--space-3); }

.pricing-price { display: flex; align-items: baseline; justify-content: center; gap: var(--space-2); margin-bottom: var(--space-2); }
.pricing-price__amount { font-size: 3rem; font-weight: 700; letter-spacing: -0.04em; color: var(--color-text); }
.pricing-price__currency { font-size: 1.2rem; font-weight: 500; color: var(--color-text-muted); align-self: flex-start; margin-top: 10px; }
.pricing-price__period { font-size: 0.88rem; color: var(--color-text-muted); }

.pricing-desc { font-size: 0.88rem; color: var(--color-text-muted); margin-bottom: var(--space-6); }

.pricing-features { text-align: left; margin-bottom: var(--space-7); display: flex; flex-direction: column; gap: var(--space-3); }
.pricing-feature { display: flex; align-items: center; gap: var(--space-3); font-size: 0.88rem; color: var(--color-text-secondary); }
.pricing-feature svg { flex-shrink: 0; color: var(--color-accent); }

.pricing-note { margin-top: var(--space-4); font-size: 0.78rem; color: var(--color-text-faint); }

/* ── Signup form ── */
.signup-section { padding: var(--space-10) 0; }

.signup-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 520px; margin: 0 auto;
}

.signup-box__title { font-size: 1.4rem; font-weight: 600; letter-spacing: -0.02em; margin-bottom: var(--space-3); color: var(--color-text); }
.signup-box__sub { font-size: 0.88rem; color: var(--color-text-muted); margin-bottom: var(--space-6); line-height: 1.7; }

.form-group { margin-bottom: var(--space-4); }
.form-group label {
  display: block; font-size: 0.82rem; font-weight: 500;
  color: var(--color-text-secondary); margin-bottom: var(--space-2);
}

.form-group input {
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-family: var(--font-sans); font-size: 0.88rem;
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition);
}
.form-group input::placeholder { color: var(--color-text-faint); }
.form-group input:focus { border-color: var(--color-accent); box-shadow: 0 0 0 2px var(--color-accent-glow); }
.form-group input.input--url { font-family: var(--font-mono); font-size: 0.84rem; }
.form-group input.error { border-color: var(--color-error); }

.form-error { font-size: 0.76rem; color: var(--color-error); margin-top: var(--space-2); display: none; }
.form-group.has-error .form-error { display: block; }

.form-submit-note {
  margin-top: var(--space-4); font-size: 0.78rem; color: var(--color-text-faint);
  text-align: center; display: flex; align-items: center; justify-content: center; gap: var(--space-2);
}

/* ── Quote ── */
.quote-section {
  padding: var(--space-9) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.quote-inner { max-width: 600px; margin: 0 auto; text-align: center; }
.quote-marks { font-size: 3rem; line-height: 1; color: var(--color-accent); opacity: 0.3; font-family: Georgia, serif; margin-bottom: var(--space-3); }
.quote-text { font-size: 1.1rem; font-weight: 450; line-height: 1.75; color: var(--color-text); margin-bottom: var(--space-5); }
.quote-author { font-size: 0.82rem; color: var(--color-text-muted); }
.quote-author strong { color: var(--color-text-secondary); font-weight: 500; }

/* ── Footer ── */
.site-footer { padding: var(--space-8) 0 var(--space-6); border-top: 1px solid var(--color-border); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--space-4); }
.footer-brand { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-tagline { font-size: 0.78rem; color: var(--color-text-faint); }
.footer-links { display: flex; gap: var(--space-5); flex-wrap: wrap; }
.footer-links a { font-size: 0.78rem; color: var(--color-text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--color-text); }
.footer-bottom { margin-top: var(--space-6); padding-top: var(--space-5); border-top: 1px solid var(--color-border); font-size: 0.76rem; color: var(--color-text-faint); text-align: center; }

/* ── Success page ── */
.success-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: var(--space-6); background: var(--color-bg); }
.success-card { max-width: 460px; text-align: center; padding: var(--space-8); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); }
.success-icon { width: 56px; height: 56px; margin: 0 auto var(--space-6); }
.success-card__title { font-size: 1.6rem; font-weight: 600; letter-spacing: -0.02em; margin-bottom: var(--space-4); color: var(--color-text); }
.success-card__body { color: var(--color-text-muted); font-size: 0.92rem; margin-bottom: var(--space-6); }
.success-card__steps { text-align: left; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-5); margin-bottom: var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); }
.success-step { display: flex; gap: var(--space-3); align-items: flex-start; font-size: 0.85rem; color: var(--color-text-muted); }
.success-step__num { flex-shrink: 0; width: 20px; height: 20px; background: var(--color-accent); color: #fff; border-radius: 50%; font-size: 0.68rem; font-weight: 600; display: flex; align-items: center; justify-content: center; margin-top: 2px; }

/* ── Responsive ── */
@media (max-width: 768px) {
  :root { --space-10: 80px; }
  .site-nav__links, .site-nav .btn { display: none; }
  .nav-toggle { display: flex; }
  .site-header.nav-open .site-nav__links {
    display: flex; flex-direction: column; position: fixed;
    top: var(--header-height); left: 0; right: 0; bottom: 0;
    background: var(--color-bg);
    padding: var(--space-8) var(--space-5); gap: var(--space-6);
    font-size: 1.1rem; z-index: 99;
  }
  .site-header.nav-open .btn--primary { display: inline-flex; margin-top: var(--space-4); }
  .hero { padding-top: calc(var(--header-height) + var(--space-8)); }
  .stats-bar__inner { gap: var(--space-6); }
  .steps::before { display: none; }
  .signup-box { padding: var(--space-6) var(--space-5); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero__cta-group { flex-direction: column; align-items: center; }
  .btn--large { width: 100%; justify-content: center; }
}