/* ===================================================================
   Mike Seiler – Personal Homepage
   Apple-Style Design System
   =================================================================== */

/* ===== Self-hosted Inter Font (kein Google CDN) ===== */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('../assets/fonts/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: 300 700;
  font-display: swap;
  src: url('../assets/fonts/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;
}

/* ===== CSS Custom Properties ===== */
:root {
  /* Colors – Light Mode */
  --color-bg:             #ffffff;
  --color-bg-secondary:   #f5f5f7;
  --color-text:           #1d1d1f;
  --color-text-secondary: #86868b;
  --color-accent:         #0071e3;
  --color-accent-hover:   #0077ed;
  --color-border:         rgba(0, 0, 0, 0.08);
  --color-glass:          rgba(255, 255, 255, 0.72);
  --color-glass-border:   rgba(255, 255, 255, 0.4);
  --color-orb-1:          rgba(0, 113, 227, 0.15);
  --color-orb-2:          rgba(88, 86, 214, 0.12);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base: 1rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.375rem;
  --font-size-2xl:  1.75rem;
  --font-size-3xl:  2.5rem;
  --font-size-4xl:  3.5rem;

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  0.875rem;
  --space-md:  1.25rem;
  --space-lg:  2rem;
  --space-xl:  3rem;
  --space-2xl: 5rem;
  --space-3xl: 7rem;

  /* Border Radius */
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   18px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:    0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-md:    0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg:    0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast:   0.15s ease;
  --transition-base:   0.3s ease;
  --transition-slow:   0.6s ease;
  --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Layout */
  --nav-height: 60px;
  --max-width:  1120px;
}

[data-theme="dark"] {
  --color-bg:             #000000;
  --color-bg-secondary:   #1c1c1e;
  --color-text:           #f5f5f7;
  --color-text-secondary: #86868b;
  --color-accent:         #2997ff;
  --color-accent-hover:   #40a9ff;
  --color-border:         rgba(255, 255, 255, 0.1);
  --color-glass:          rgba(28, 28, 30, 0.8);
  --color-glass-border:   rgba(255, 255, 255, 0.08);
  --color-orb-1:          rgba(41, 151, 255, 0.18);
  --color-orb-2:          rgba(88, 86, 214, 0.16);
  --shadow-sm:    0 1px 4px rgba(0, 0, 0, 0.3);
  --shadow-md:    0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg:    0 12px 40px rgba(0, 0, 0, 0.5);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.3);
}


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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  transition: background var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

section[id] {
  scroll-margin-top: var(--nav-height);
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: var(--font-family);
}

h1, h2, h3, h4 {
  line-height: 1.15;
  letter-spacing: -0.02em;
}


/* ===== Layout Utilities ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) var(--space-lg);
  background: var(--color-bg);
  transition: background var(--transition-base);
}

.section-alt {
  background: var(--color-bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}


/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

[data-theme="dark"] .nav {
  background: rgba(0, 0, 0, 0.72);
}

.nav.nav-scrolled {
  background: rgba(255, 255, 255, 0.9);
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 0 var(--color-border);
}

[data-theme="dark"] .nav.nav-scrolled {
  background: rgba(0, 0, 0, 0.9);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.nav-logo {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

.nav-logo:hover {
  opacity: 0.7;
}

/* Desktop nav links */
.nav-links {
  display: none; /* Mobile-first: hidden by default */
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
  border-radius: var(--radius-full);
}

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

.nav-link.active::after {
  transform: scaleX(1);
}

/* Nav actions: theme toggle + hamburger */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: background var(--transition-fast), transform var(--transition-spring), border-color var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-bg-secondary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Show/hide sun & moon based on theme */
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }
[data-theme="dark"]  .icon-sun  { display: block; }
[data-theme="dark"]  .icon-moon { display: none; }

/* Hamburger button */
.nav-mobile-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  transition: background var(--transition-fast);
}

.nav-mobile-toggle:hover {
  background: var(--color-bg-secondary);
}

.nav-mobile-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

/* Hamburger → X animation */
.nav-open .nav-mobile-toggle span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-open .nav-mobile-toggle span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-open .nav-mobile-toggle span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Scroll progress bar */
.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), #5856d6);
  transition: width 0.1s linear;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}


/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-3xl);
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
}

/* Gradient orbs */
.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  animation: float 10s ease-in-out infinite;
}

.hero-bg-orb--1 {
  width: min(700px, 100vw);
  height: min(700px, 100vw);
  background: radial-gradient(circle, var(--color-orb-1), transparent 70%);
  top: -15%;
  right: -10%;
  animation-duration: 10s;
  animation-delay: 0s;
}

.hero-bg-orb--2 {
  width: min(500px, 80vw);
  height: min(500px, 80vw);
  background: radial-gradient(circle, var(--color-orb-2), transparent 70%);
  bottom: 5%;
  left: -8%;
  animation-duration: 13s;
  animation-delay: -5s;
}

/* Hero content */
.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 700px;
  width: 100%;
}

/* Profile photo */
.hero-photo-wrapper {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto var(--space-xl);
  position: relative;
  border: 3px solid rgba(0, 113, 227, 0.25);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15), 0 0 0 6px rgba(0, 113, 227, 0.08);
  background: linear-gradient(135deg, #0071e3 0%, #5856d6 100%);
  animation: fadeInDown 0.9s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Initial letter shown when photo is missing */
.hero-photo-wrapper::after {
  content: attr(data-initial);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3.5rem;
  font-weight: 700;
  color: white;
  opacity: 0;
  pointer-events: none;
  font-family: var(--font-family);
  line-height: 1;
}

.hero-photo-wrapper.photo-error::after {
  opacity: 1;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-greeting {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
  animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
}

.hero-title {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.25s both;
}

.accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: clamp(var(--font-size-base), 2.5vw, var(--font-size-xl));
  color: var(--color-text-secondary);
  min-height: 2em;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.35s both;
}

.typing-cursor {
  color: var(--color-accent);
  animation: blink 0.8s infinite;
  font-weight: 300;
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.45s both;
}


/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8125rem 1.625rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), transform var(--transition-spring), box-shadow var(--transition-fast), opacity var(--transition-fast);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97) !important;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.35);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 6px 20px rgba(0, 113, 227, 0.45);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

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

.btn-full {
  width: 100%;
}

/* Loading state on submit button */
.btn-loading {
  display: none;
}


/* ===== Glassmorphism Card ===== */
.glass-card {
  background: var(--color-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glass);
}


/* ===== About Section ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.about-card {
  padding: var(--space-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.about-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.about-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 113, 227, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: var(--color-accent);
  flex-shrink: 0;
}

[data-theme="dark"] .about-icon {
  background: rgba(41, 151, 255, 0.15);
}

.about-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.625rem;
}

.about-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}


/* ===== Interests Section ===== */
.interests-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.interest-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  cursor: default;
}

.interest-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-xl);
  background: var(--color-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  transition: transform var(--transition-spring), box-shadow var(--transition-base), background var(--transition-fast);
}

.interest-item:hover .interest-icon {
  transform: scale(1.12) translateY(-4px);
  box-shadow: var(--shadow-md);
  background: rgba(0, 113, 227, 0.08);
}

[data-theme="dark"] .interest-item:hover .interest-icon {
  background: rgba(41, 151, 255, 0.1);
}

.interest-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
}


/* ===== Contact Section ===== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact-info h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.contact-info > p {
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-lg);
  max-width: 380px;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-accent);
  font-weight: 500;
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xl);
  transition: gap var(--transition-fast), opacity var(--transition-fast);
}

.contact-email:hover {
  opacity: 0.8;
  gap: 0.875rem;
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-spring), border-color var(--transition-fast);
}

.social-link:hover {
  color: var(--color-accent);
  background: rgba(0, 113, 227, 0.08);
  border-color: rgba(0, 113, 227, 0.2);
  transform: translateY(-3px);
}

[data-theme="dark"] .social-link:hover {
  background: rgba(41, 151, 255, 0.1);
}

.social-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Contact Form */
.contact-form {
  padding: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
  line-height: 1.6;
}

.form-status {
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  min-height: 1.5em;
  line-height: 1.5;
}

.form-status.success {
  color: #34c759;
}

.form-status.error {
  color: #ff3b30;
}


/* ===== Footer ===== */
.footer {
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  transition: background var(--transition-base);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copyright,
.footer-sub {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}


/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 113, 227, 0.4);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-base), transform var(--transition-base), box-shadow var(--transition-fast);
  pointer-events: none;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0, 113, 227, 0.5);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}


/* ===== Scroll Reveal Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ===== Keyframe Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-28px) scale(1.04);
  }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}


/* ===== Responsive ===== */

/* Tablet & up (≥ 640px) */
@media (min-width: 640px) {
  .about-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .interests-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Desktop (≥ 769px) */
@media (min-width: 769px) {
  /* Show desktop nav links, hide hamburger */
  .nav-links {
    display: flex;
  }

  .nav-mobile-toggle {
    display: none;
  }

  .about-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .interests-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .contact-layout {
    grid-template-columns: 1fr 1.4fr;
    gap: var(--space-3xl);
  }
}


/* Mobile-only adjustments (< 769px) */
@media (max-width: 768px) {
  /* Mobile nav dropdown */
  .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem var(--space-lg) var(--space-sm);
    gap: 0;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .nav-open .nav-links {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-link {
    padding: 0.75rem 0;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-base);
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .nav-link::after {
    display: none;
  }

  .hero-photo-wrapper {
    width: 130px;
    height: 130px;
  }

  .about-card {
    padding: var(--space-lg);
  }

  .contact-form {
    padding: var(--space-lg);
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.375rem;
    text-align: center;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta .btn {
    justify-content: center;
  }

  .interests-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
}


/* ===== Modal (Impressum / Datenschutz) ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
}

.modal.open {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.modal-box {
  position: relative;
  z-index: 1;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg) var(--space-lg);
  max-width: 680px;
  width: calc(100% - 2rem);
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.25s ease;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.modal-close:hover {
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

.modal-close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.modal-body h2 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin: var(--space-md) 0 0.375rem;
}

.modal-body h2:first-child {
  margin-top: 0;
}

.modal-body p,
.modal-body address {
  font-size: var(--font-size-sm);
  line-height: 1.75;
  color: var(--color-text-secondary);
  font-style: normal;
  margin-bottom: 0;
}

.modal-body code {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 0.8rem;
  background: var(--color-bg-secondary);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

.modal-body a {
  color: var(--color-accent);
  text-decoration: none;
}

.modal-body a:hover {
  text-decoration: underline;
}

/* Footer legal links */
.footer-legal {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

.footer-legal-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-legal-link:hover {
  color: var(--color-accent);
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .hero-bg-orb {
    animation: none;
  }

  .typing-cursor {
    animation: none;
  }
}