/* style.css — kamilkalinowski.pl */


/* Design tokens */

:root {
  /* Color palette — warm neutral "paper" feel */
  --color-bg:           #F7F5F2; /* Page background — warm off-white */
  --color-surface:      #FFFFFF; /* Elevated surfaces (cards, nav) */
  --color-text:         #1A1A1A; /* Primary body text */
  --color-text-muted:   #5C5C5C; /* Secondary text, captions */
  --color-accent:       #2B4C7E; /* Ink-blue — links, CTAs, highlights */
  --color-accent-hover: #1A3560; /* Darker shade for hover states */
  --color-border:       #E0DDD8; /* Dividers and subtle borders */

  /* Typography scale (fluid, rem-based) */
  --font-family:        'Inter', system-ui, -apple-system, BlinkMacSystemFont,
                        'Segoe UI', sans-serif;
  --font-size-xs:       0.75rem;   /*  12px */
  --font-size-sm:       0.875rem;  /*  14px */
  --font-size-base:     1rem;      /*  16px */
  --font-size-md:       1.125rem;  /*  18px */
  --font-size-lg:       1.375rem;  /*  22px */
  --font-size-xl:       1.75rem;   /*  28px */
  --font-size-2xl:      2.25rem;   /*  36px */
  --font-size-3xl:      3rem;      /*  48px */

  --font-weight-normal:  400;
  --font-weight-medium:  500;
  --font-weight-bold:    700;

  --line-height-tight:  1.2;
  --line-height-base:   1.65;

  /* Spacing scale */
  --space-1:   0.25rem;   /*  4px */
  --space-2:   0.5rem;    /*  8px */
  --space-3:   0.75rem;   /* 12px */
  --space-4:   1rem;      /* 16px */
  --space-5:   1.5rem;    /* 24px */
  --space-6:   2rem;      /* 32px */
  --space-7:   3rem;      /* 48px */
  --space-8:   4rem;      /* 64px */
  --space-9:   6rem;      /* 96px */

  /* Layout */
  --max-content-width: 740px;   /* Optimal reading line length */
  --max-wide-width:    1100px;  /* For full-width sections */
  --nav-height:        64px;

  /* Interaction */
  --transition-fast:   150ms ease;
  --transition-base:   200ms ease;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
}


/* Reset & base */

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

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

/* Accessible focus outline — visible, on-brand */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}


/* Typography */

h1, h2, h3, h4 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size-md); }

/* Scale up headings on larger screens */
@media (min-width: 600px) {
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
}

p {
  font-size: var(--font-size-md);
  color: var(--color-text);
  max-width: 65ch; /* Constrains line length for readability */
}

/* Muted helper text */
.text-muted {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* Section label — small, spaced, uppercase */
.section-label {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}


/* Links & buttons */

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: color var(--transition-base),
              text-decoration-color var(--transition-base);
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}

/* Standalone CTA link / button style */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;        /* Tap target */
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base),
              color var(--transition-base),
              transform var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
  text-decoration: none;
  transform: translateY(-1px); /* Subtle lift effect */
}

.btn--outline {
  background-color: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn--outline:hover {
  background-color: var(--color-accent);
  color: #FFFFFF;
  text-decoration: none;
}


/* Layout */

/* Centers content and caps its maximum width */
.container {
  width: 100%;
  max-width: var(--max-content-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* Wider container for sections that need more breathing room */
.container--wide {
  max-width: var(--max-wide-width);
}

.section {
  padding-block: var(--space-8);
}

.section--sm {
  padding-block: var(--space-6);
}

.section + .section {
  border-top: 1px solid var(--color-border);
}


/* Navigation */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(247, 245, 242, 0.88); /* Semi-transparent paper */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base);
}

/* Class toggled by JS when page is scrolled */
.site-nav.nav--scrolled {
  border-bottom-color: var(--color-border);
}

.site-nav__inner {
  /* Flexbox: logo on left, nav links on right */
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-wide-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.site-nav__logo {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-base);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-nav__logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.site-nav__links {
  /* Horizontal list of nav links */
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.site-nav__links a {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-2); /* Increases tap target height */
  transition: color var(--transition-base);
}

.site-nav__links a:hover {
  color: var(--color-accent);
}


/* Hero */

.hero {
  /* Push content below the fixed nav */
  padding-top: calc(var(--nav-height) + var(--space-9));
  padding-bottom: var(--space-9);
  min-height: 100svh; /* svh = small viewport height, accounts for mobile browser Chrome */
  display: flex;
  align-items: center;
}

.hero__eyebrow {
  /* Small label above the name */
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.hero__name {
  font-size: clamp(2.25rem, 6vw, 4rem); /* Fluid type — scales with viewport */
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-5);
}

.hero__tagline {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-muted);
  max-width: 50ch;
  margin-bottom: var(--space-7);
  line-height: var(--line-height-base);
}

.hero__cta {
  /* Horizontal group of CTA buttons */
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}


/* Bio */

.bio__heading {
  margin-bottom: var(--space-5);
}

.bio__body {
  /* Stack paragraphs with consistent spacing */
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.bio__body p {
  color: var(--color-text);
}


/* Journey */

.journey__heading {
  margin-bottom: var(--space-5);
}

.journey__placeholder {
  padding: var(--space-7) var(--space-5);
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}


/* Contact */

.contact__heading {
  margin-bottom: var(--space-4);
}

.contact__intro {
  margin-bottom: var(--space-6);
  color: var(--color-text-muted);
}

.contact__email-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  text-decoration: none;
  padding-block: var(--space-2); /* Tap target */
  border-bottom: 1.5px solid transparent;
  transition: border-color var(--transition-base),
              color var(--transition-base);
}

.contact__email-link:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent-hover);
}


/* Footer */

.site-footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
}

.site-footer__copy {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

@media (min-width: 600px) {
  .site-footer__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}


/* Responsive — 900px+ */

@media (min-width: 900px) {
  .container {
    padding-inline: var(--space-6);
  }

  .section {
    padding-block: var(--space-9);
  }
}