/* ==============================================
   styles.css – Portfolio Website
   Farben, Komponenten, Animationen
   Kompatibel mit Tailwind CSS v4 (Play CDN)
   ============================================== */


/* -----------------------------------------------
   CUSTOM PROPERTIES (CSS Variables)
   Zentrale Stelle für alle Designwerte.
----------------------------------------------- */
:root {
  --color-bg:       #0D1117;
  --color-surface:  #161B22;
  --color-border:   #30363D;
  --color-accent:   #58A6FF;
  --color-text:     #F0F6FF;
  --color-text-dim: rgba(240, 246, 255, 0.6);

  --font-heading: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;

  --radius:    12px;
  --radius-sm: 8px;

  --transition: 200ms ease;
  --transition-slow: 400ms ease;
}


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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Schöner Scrollbar (Webkit) */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* Selektion */
::selection {
  background: rgba(88, 166, 255, 0.25);
  color: var(--color-text);
}


/* -----------------------------------------------
   TYPOGRAPHY
----------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--color-text);
}

/* Gradient-Text für Headline-Highlights */
.text-gradient {
  background: linear-gradient(135deg, var(--color-accent) 0%, #a5d6ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}


/* -----------------------------------------------
   LAYOUT HELPERS
----------------------------------------------- */
.section-padding {
  padding-top: 6rem;
  padding-bottom: 6rem;
}

.section-header {
  text-align: center;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--color-text);
}


/* -----------------------------------------------
   NAVBAR
----------------------------------------------- */
#navbar {
  background-color: transparent;
}

/* Klasse wird via JS beim Scrollen hinzugefügt */
#navbar.scrolled {
  background-color: rgba(13, 17, 23, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav-link {
  color: rgba(240, 246, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-link:hover {
  color: var(--color-text);
}

.nav-link:hover::after {
  width: 100%;
}

/* Hamburger Lines */
.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}

/* Aktiver Zustand des Hamburgers (X-Form) */
#menu-toggle.is-open .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
#menu-toggle.is-open .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
#menu-toggle.is-open .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* -----------------------------------------------
   BUTTONS
----------------------------------------------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background-color: var(--color-accent);
  color: #0D1117;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  background-color: #79b8ff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(88, 166, 255, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background-color: transparent;
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: transparent;
  color: var(--color-text-dim);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}


/* -----------------------------------------------
   CARDS
----------------------------------------------- */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition-slow), transform var(--transition-slow), box-shadow var(--transition-slow);
}

.card-hover:hover {
  border-color: rgba(88, 166, 255, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(88, 166, 255, 0.1);
}


/* -----------------------------------------------
   TAGS (Projekt-Badges)
----------------------------------------------- */
.tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(88, 166, 255, 0.12);
  border: 1px solid rgba(88, 166, 255, 0.25);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}


/* -----------------------------------------------
   SKILLS
----------------------------------------------- */
.skill-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-dim);
  padding: 0.375rem 0;
  border-bottom: 1px solid rgba(48, 54, 61, 0.5);
  transition: color var(--transition), padding-left var(--transition);
}

.skill-item:last-child {
  border-bottom: none;
}

.skill-item::before {
  content: '›';
  color: var(--color-accent);
  font-weight: bold;
  transition: transform var(--transition);
}

.card:hover .skill-item::before {
  transform: translateX(2px);
}

.card:hover .skill-item {
  color: var(--color-text);
}


/* -----------------------------------------------
   CONTACT FORM
----------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(240, 246, 255, 0.7);
  letter-spacing: 0.02em;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-input::placeholder {
  color: rgba(240, 246, 255, 0.25);
}

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

/* Validierungszustände */
.form-input.is-invalid {
  border-color: #f85149;
  box-shadow: 0 0 0 3px rgba(248, 81, 73, 0.15);
}

.form-input.is-valid {
  border-color: #3fb950;
}

/* Feedback Text */
.feedback-success {
  color: #3fb950;
}

.feedback-error {
  color: #f85149;
}

/* Disabled State beim Senden */
#submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}


/* -----------------------------------------------
   SOCIAL LINKS
----------------------------------------------- */
.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.social-link:hover {
  color: var(--color-accent);
  border-color: rgba(88, 166, 255, 0.3);
  background: rgba(88, 166, 255, 0.08);
}


/* -----------------------------------------------
   ANIMATIONEN
----------------------------------------------- */

/* Fade-In + Slide-Up (für Sections beim Einblenden) */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Klasse für Elemente, die animiert werden sollen */
.fade-in-up {
  opacity: 0; /* Startet unsichtbar */
  animation: fadeInUp 0.6s ease forwards;
}

/* Elemente, die noch nicht im Viewport sind (via JS gesetzt) */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* -----------------------------------------------
   HERO: Animated Gradient Border um Profilfoto
----------------------------------------------- */
@keyframes rotateBorder {
  from { --angle: 0deg; }
  to   { --angle: 360deg; }
}


/* -----------------------------------------------
   RESPONSIVE ANPASSUNGEN
----------------------------------------------- */
@media (max-width: 768px) {
  .section-padding {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }
}