/* Inter — self-hosted variable font */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/assets/font/inter-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304,
    U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0,
    U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/assets/font/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

/* ZÁKLADNÍ STYLE SET */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --black: #1d1d1f;
  --gray-dark: #424245;
  --gray: #6b6b70;
  --gray-light: #f5f5f7;
  --white: #ffffff;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-soft: rgba(0, 113, 227, 0.08);

  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.08);
  --container-max: 800px;
}

body {
  font-family: "Inter", sans-serif;
  color: var(--black);
  background: var(--gray-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: var(--white); }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* HEADER */
header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  position: sticky; top: 0; z-index: 100;
}

nav {
  max-width: 1120px; margin: 0 auto; padding: 0 24px; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
}

.logo { font-weight: 700; font-size: 1.125rem; color: var(--black); text-decoration: none; letter-spacing: -0.02em; }
.logo:hover { text-decoration: none; }
.logo span { color: var(--accent); }

.back-btn {
  font-size: 0.875rem; font-weight: 500; color: var(--gray-dark);
  display: inline-flex; align-items: center; gap: 6px;
}
.back-btn svg { width: 16px; height: 16px; }
.back-btn:hover { color: var(--accent); text-decoration: none; }

/* CONTENT */
main { padding: 60px 24px; min-height: 80vh; }

.paper {
  max-width: var(--container-max); margin: 0 auto;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-medium);
}

h1 { 
  font-size: clamp(1.75rem, 4vw, 2.5rem); 
  letter-spacing: -0.025em; 
  margin-bottom: 16px; 
  line-height: 1.1; 
}

h2 { 
  font-size: 1.5rem; 
  margin-top: 40px; 
  margin-bottom: 16px; 
  letter-spacing: -0.02em; 
}

h3 { 
  font-size: 1.125rem; 
  margin-top: 24px; 
  margin-bottom: 12px; 
}

p, li { 
  color: var(--gray); 
  margin-bottom: 16px; 
  font-size: 1rem; 
}

ul { 
  margin-bottom: 16px; 
  padding-left: 24px; 
}

li { 
  margin-bottom: 8px; 
}

strong { 
  color: var(--black); 
  font-weight: 600; 
}

.intro-p { 
  font-size: 1.125rem; 
  color: var(--gray-dark); 
  margin-bottom: 40px; 
  border-bottom: 1px solid #e5e5e5; 
  padding-bottom: 24px; 
}

.box {
  background: var(--gray-light); 
  padding: 24px; 
  border-radius: var(--radius-lg); 
  margin: 24px 0;
}

.box p {
  margin-bottom: 0;
}

/* FOOTER */
footer { 
  text-align: center; 
  padding: 40px 24px; 
  color: var(--gray); 
  font-size: 0.875rem; 
}

@media (max-width: 768px) {
  .paper { padding: 32px 24px; }
  main { padding: 40px 24px; }
}