/* ============================================================
   ralfgruber.dev — Style Sheet
   Dark Mode first · Mobile first · No frameworks
   ============================================================ */

/* ------------------------------------------------------------------
   1. Custom Properties
------------------------------------------------------------------ */
:root {
  /* Colors */
  --c-bg:           #0d1117;
  --c-bg-secondary: #161b22;
  --c-bg-card:      #1c2230;
  --c-bg-card-h:    #1e2a3a;
  --c-border:       #30363d;
  --c-text:         #e6edf3;
  --c-text-muted:   #8b949e;
  --c-accent:       #22d3ee;
  --c-accent-dim:   rgba(34, 211, 238, 0.12);
  --c-accent-h:     #0ea5e9;
  --c-badge:        rgba(34, 211, 238, 0.15);

  /* Typography */
  --font:           'Inter', system-ui, sans-serif;
  --fs-xs:          0.75rem;
  --fs-sm:          0.875rem;
  --fs-base:        1rem;
  --fs-lg:          1.125rem;
  --fs-xl:          1.25rem;
  --fs-2xl:         1.5rem;
  --fs-3xl:         1.875rem;
  --fs-4xl:         2.25rem;
  --fs-5xl:         3rem;
  --fs-hero:        clamp(2.5rem, 7vw, 5rem);

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2rem;
  --space-xl:  3rem;
  --space-2xl: 5rem;
  --space-3xl: 7rem;

  /* Misc */
  --radius:    0.5rem;
  --radius-lg: 0.75rem;
  --transition: 200ms ease;
  --nav-h:     64px;
  --max-w:     1100px;
}

/* ------------------------------------------------------------------
   2. Reset & Base
------------------------------------------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--c-accent-h); }

ul { list-style: none; }

/* ------------------------------------------------------------------
   3. Layout Utilities
------------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.section {
  padding-block: var(--space-3xl);
}

.section__heading {
  font-size: var(--fs-3xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  position: relative;
  display: inline-block;
}
.section__heading::after {
  content: '';
  display: block;
  height: 3px;
  width: 2.5rem;
  background: var(--c-accent);
  margin-top: 0.4rem;
  border-radius: 2px;
}

.section__subtitle {
  color: var(--c-text-muted);
  font-size: var(--fs-lg);
  margin-bottom: var(--space-xl);
  max-width: 56ch;
}

/* Fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.is-visible {
  opacity: 1;
  transform: none;
}

/* ------------------------------------------------------------------
   4. Buttons
------------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background var(--transition), color var(--transition),
    box-shadow var(--transition), border-color var(--transition);
  text-decoration: none;
}

.btn--primary {
  background: var(--c-accent);
  color: #0d1117;
}
.btn--primary:hover {
  background: var(--c-accent-h);
  color: #0d1117;
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
}
.btn--ghost:hover {
  background: var(--c-accent-dim);
  color: var(--c-accent);
}

.btn--sm {
  padding: 0.4rem 1rem;
  font-size: var(--fs-xs);
}

/* ------------------------------------------------------------------
   5. Navigation
------------------------------------------------------------------ */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: transparent;
  transition: background var(--transition), backdrop-filter var(--transition),
    border-bottom var(--transition);
}
header.scrolled {
  background: rgba(13, 17, 23, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.nav {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.nav__logo {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
  flex-shrink: 0;
  text-decoration: none;
}
.nav__logo span { color: var(--c-accent); }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-left: auto;
}
.nav__links a {
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
}
.nav__links a:hover { color: var(--c-text); }

/* Language Toggle */
.lang-toggle {
  background: none;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  display: flex;
  gap: 0.25rem;
  align-items: center;
  font-family: var(--font);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-text-muted);
  transition: border-color var(--transition);
  flex-shrink: 0;
}
.lang-toggle:hover { border-color: var(--c-accent); }
.lang-toggle .lang-sep { opacity: 0.4; }
.lang-toggle .lang-de,
.lang-toggle .lang-en { transition: color var(--transition); }
.lang-toggle .lang-de.active,
.lang-toggle .lang-en.active { color: var(--c-accent); }

/* Hamburger */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav__burger span {
  display: block;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ------------------------------------------------------------------
   6. Hero
------------------------------------------------------------------ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-top: var(--nav-h);
  padding-bottom: var(--space-3xl);
  position: relative;
  overflow: hidden;
}

/* Subtle background grid */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* Accent glow */
.hero::after {
  content: '';
  position: absolute;
  top: 20%;
  right: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero__greeting {
  font-size: var(--fs-lg);
  color: var(--c-accent);
  font-weight: 500;
  margin-bottom: var(--space-xs);
  letter-spacing: 0.03em;
}

.hero__name {
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}

.hero__tagline {
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--c-text-muted);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.hero__sub {
  font-size: var(--fs-lg);
  color: var(--c-text-muted);
  max-width: 50ch;
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  color: var(--c-text-muted);
  font-size: var(--fs-xl);
  animation: bounce 2s infinite;
  text-decoration: none;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ------------------------------------------------------------------
   7. About
------------------------------------------------------------------ */
.about { background: var(--c-bg-secondary); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2xl);
  align-items: start;
  margin-top: var(--space-xl);
}

.about__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.about__text p {
  color: var(--c-text-muted);
  font-size: var(--fs-lg);
  line-height: 1.7;
}
.about__text p:first-child { color: var(--c-text); }

.about__photo-wrap {
  flex-shrink: 0;
}

/* TODO: [PROFILFOTO] — assets/foto.jpg hier einfügen */
.about__photo-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--c-bg-card);
  border: 2px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-4xl);
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: -0.03em;
}

/* ------------------------------------------------------------------
   8. Services
------------------------------------------------------------------ */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

/* ------------------------------------------------------------------
   9. Cards (shared)
------------------------------------------------------------------ */
.card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color var(--transition), background var(--transition),
    transform var(--transition);
}
.card:hover {
  border-color: var(--c-accent);
  background: var(--c-bg-card-h);
  transform: translateY(-3px);
}

.card__icon {
  width: 44px;
  height: 44px;
  background: var(--c-accent-dim);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-accent);
  flex-shrink: 0;
}
.card__icon svg { width: 22px; height: 22px; stroke-width: 1.75; }

.card__title {
  font-size: var(--fs-lg);
  font-weight: 600;
  line-height: 1.3;
}

.card__desc {
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  line-height: 1.65;
  flex: 1;
}

.card__meta {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  margin-top: calc(-1 * var(--space-xs));
}

/* ------------------------------------------------------------------
   10. Projects
------------------------------------------------------------------ */
.projects { background: var(--c-bg-secondary); }

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.card--project { position: relative; }

.badge {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  background: var(--c-badge);
  color: var(--c-accent);
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.3);
  align-self: flex-start;
}

/* ------------------------------------------------------------------
   11. Blog Preview
------------------------------------------------------------------ */
.blog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.card--blog { gap: var(--space-xs); }

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.25rem;
}

.tag {
  font-size: var(--fs-xs);
  font-weight: 500;
  padding: 0.15rem 0.55rem;
  background: var(--c-bg-secondary);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  color: var(--c-text-muted);
}
.tag--highlight {
  background: var(--c-accent-dim);
  border-color: rgba(34, 211, 238, 0.3);
  color: var(--c-accent);
}

.blog__cta {
  margin-top: var(--space-xl);
  text-align: center;
}

/* ------------------------------------------------------------------
   12. Contact
------------------------------------------------------------------ */
.contact { background: var(--c-bg-secondary); }

.contact__form {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form__group label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--c-text-muted);
}

.form__group input,
.form__group textarea {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0.65rem 0.9rem;
  color: var(--c-text);
  font-family: var(--font);
  font-size: var(--fs-base);
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}
.form__group input:focus,
.form__group textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.12);
}
.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--c-text-muted);
  opacity: 0.6;
}

.form__privacy {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  margin-top: calc(-1 * var(--space-xs));
}

.contact__email {
  margin-top: var(--space-xl);
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

/* ------------------------------------------------------------------
   13. Footer
------------------------------------------------------------------ */
.footer {
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  padding-block: var(--space-xl);
}

.footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.footer__logo {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
}
.footer__logo span { color: var(--c-accent); }

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.footer__nav a {
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: color var(--transition);
}
.footer__nav a:hover { color: var(--c-text); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  border-top: 1px solid var(--c-border);
  padding-top: var(--space-md);
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
}
.footer__bottom a {
  color: var(--c-text-muted);
  transition: color var(--transition);
}
.footer__bottom a:hover { color: var(--c-accent); }
.footer__bottom svg { width: 20px; height: 20px; }

/* ------------------------------------------------------------------
   14. Impressum
------------------------------------------------------------------ */
.impressum {
  background: var(--c-bg-secondary);
  border-top: 1px solid var(--c-border);
}
.impressum h2 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}
.impressum__placeholder {
  border: 2px dashed var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  line-height: 1.7;
  max-width: 60ch;
}

/* ------------------------------------------------------------------
   15. Blog Page (blog.html)
------------------------------------------------------------------ */
.blog-page {
  padding-top: calc(var(--nav-h) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
}

.blog-page__heading {
  font-size: var(--fs-4xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.blog-page__sub {
  color: var(--c-text-muted);
  font-size: var(--fs-lg);
  margin-bottom: var(--space-2xl);
}

/* ------------------------------------------------------------------
   16. Blog Post
------------------------------------------------------------------ */
.post-page {
  padding-top: calc(var(--nav-h) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
}

.post-page__back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  text-decoration: none;
  margin-bottom: var(--space-xl);
  transition: color var(--transition);
}
.post-page__back:hover { color: var(--c-accent); }

.post__header { margin-bottom: var(--space-xl); }
.post__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: var(--space-sm); }
.post__title {
  font-size: var(--fs-4xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}
.post__meta { color: var(--c-text-muted); font-size: var(--fs-sm); }

.post__body {
  max-width: 68ch;
  font-size: var(--fs-lg);
  line-height: 1.75;
  color: var(--c-text-muted);
}
.post__body h2 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--c-text);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}
.post__body p { margin-bottom: var(--space-sm); }
.post__body strong { color: var(--c-text); }
.post__body code {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-size: 0.9em;
  color: var(--c-accent);
}
.post__body pre {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-sm);
}
.post__body pre code {
  background: none;
  border: none;
  padding: 0;
}

.post__wip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.3);
  color: #fbbf24;
  border-radius: var(--radius);
  padding: var(--space-md) var(--space-lg);
  font-size: var(--fs-sm);
  font-weight: 500;
  margin-bottom: var(--space-xl);
}

/* ------------------------------------------------------------------
   17. Responsive
------------------------------------------------------------------ */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(13, 17, 23, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--c-border);
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    padding-block: var(--space-xl);
    transform: translateY(-110%);
    transition: transform 0.3s ease;
    z-index: 99;
  }
  .nav__links.is-open { transform: translateY(0); }
  .nav__links a { font-size: var(--fs-base); }

  .nav__burger { display: flex; }

  .about__grid {
    grid-template-columns: 1fr;
  }
  .about__photo-wrap {
    display: flex;
    justify-content: center;
    order: -1;
  }
  .about__photo-placeholder {
    width: 140px;
    height: 140px;
    font-size: var(--fs-3xl);
  }

  .hero__sub { max-width: 100%; }
  .post__title { font-size: var(--fs-3xl); }
}

@media (max-width: 480px) {
  :root { --space-3xl: 4rem; }
  .section__heading { font-size: var(--fs-2xl); }
  .footer__top { flex-direction: column; align-items: flex-start; }
}