/* ============================================================
   QR-Code-Generator – Global Stylesheet
   Design: Modern Clean · Indigo-to-Cyan Gradient System
   ============================================================ */

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Colors */
  --clr-bg:            #f0f4ff;
  --clr-surface:       #ffffff;
  --clr-surface-2:     #f8faff;
  --clr-primary:       #4f46e5;
  --clr-primary-dark:  #3730a3;
  --clr-primary-light: #818cf8;
  --clr-accent:        #0ea5e9;
  --clr-accent-dark:   #0284c7;
  --clr-text:          #0f172a;
  --clr-text-muted:    #64748b;
  --clr-border:        #e2e8f0;
  --clr-border-focus:  rgba(79, 70, 229, 0.4);
  --clr-success:       #10b981;
  --clr-error:         #ef4444;
  --clr-warning:       #f59e0b;

  /* Feature icon colors */
  --clr-blue:   #3b82f6;
  --clr-green:  #10b981;
  --clr-purple: #8b5cf6;
  --clr-orange: #f97316;
  --clr-cyan:   #06b6d4;
  --clr-red:    #ef4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #0ea5e9 100%);
  --gradient-hero:    linear-gradient(135deg, #eef2ff 0%, #e0f2fe 50%, #f0e7ff 100%);
  --gradient-card:    linear-gradient(145deg, #ffffff 0%, #f8faff 100%);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;

  /* Spacing scale */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(79, 70, 229, 0.10), 0 2px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 50px rgba(79, 70, 229, 0.14), 0 8px 20px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 40px 80px rgba(79, 70, 229, 0.20);
  --shadow-btn: 0 4px 15px rgba(79, 70, 229, 0.35);
  --shadow-btn-hover: 0 8px 28px rgba(79, 70, 229, 0.50);

  /* Border Radius */
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --radius-full: 9999px;

  /* Transitions */
  --t-fast:   0.15s ease;
  --t-base:   0.25s ease;
  --t-slow:   0.4s cubic-bezier(0.22, 1, 0.36, 1);

  /* Layout */
  --container-max: 1100px;
  --header-h:      70px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--clr-text);
  background-color: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; }
a { color: inherit; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ── Layout Utilities ──────────────────────────────────────── */
.container {
  width: min(var(--container-max), 100% - var(--sp-8));
  margin-inline: auto;
}

/* ── Header ────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: var(--sp-8);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(79, 70, 229, 0.08);
  box-shadow: 0 1px 12px rgba(79, 70, 229, 0.06);
  gap: var(--sp-4);
}

/* Logo */
.site-logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}

.logo-img {
  height: 36px;
  width: auto;
  border-radius: 6px;
}

.site-logo .logo-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-primary);
  letter-spacing: -0.02em;
}

.logo-text {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.logo-icon { font-size: 1.2rem; }

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav-link {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--clr-primary);
  background: rgba(79, 70, 229, 0.08);
}

.nav-link.active {
  font-weight: 600;
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: none;
  border: none;
  padding: var(--sp-2);
  border-radius: var(--radius-sm);
  transition: background var(--t-fast);
}

.nav-toggle:hover { background: rgba(79, 70, 229, 0.08); }

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--clr-text);
  border-radius: var(--radius-full);
  transition: transform var(--t-base), opacity var(--t-fast);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero Section ──────────────────────────────────────────── */
.hero {
  position: relative;
  background: var(--gradient-hero);
  padding-block: var(--sp-24) var(--sp-20);
  text-align: center;
  overflow: hidden;
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(60px);
}

.hero-bg-orb--1 {
  width: 500px;
  height: 500px;
  background: rgba(79, 70, 229, 0.10);
  top: -100px;
  left: -100px;
}

.hero-bg-orb--2 {
  width: 400px;
  height: 400px;
  background: rgba(14, 165, 233, 0.10);
  bottom: -80px;
  right: -80px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin-inline: auto;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--clr-primary);
  background: rgba(79, 70, 229, 0.1);
  border: 1px solid rgba(79, 70, 229, 0.2);
  padding: var(--sp-1) var(--sp-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--sp-6);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--clr-text);
  margin-bottom: var(--sp-6);
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--clr-text-muted);
  max-width: 580px;
  margin-inline: auto;
  margin-bottom: var(--sp-10);
  line-height: 1.7;
}

.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-8);
  font-size: 1rem;
}

.btn-hero svg {
  width: 18px;
  height: 18px;
  margin-top: 2px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-full);
  padding: var(--sp-3) var(--sp-6);
  cursor: pointer;
  transition: all var(--t-base);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-btn-hover);
}

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

.btn-outline {
  background: transparent;
  color: var(--clr-primary);
  border: 2px solid var(--clr-primary);
}

.btn-outline:hover {
  background: rgba(79, 70, 229, 0.06);
  transform: translateY(-1px);
}

.btn-download {
  flex: 1;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  padding: var(--sp-3) var(--sp-5);
  transition: all var(--t-base);
}

.btn-png {
  background: rgba(79, 70, 229, 0.08);
  color: var(--clr-primary);
  border: 1.5px solid rgba(79, 70, 229, 0.2);
}

.btn-png:hover {
  background: var(--clr-primary);
  color: #fff;
  border-color: var(--clr-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-svg {
  background: rgba(14, 165, 233, 0.08);
  color: var(--clr-accent-dark);
  border: 1.5px solid rgba(14, 165, 233, 0.25);
}

.btn-svg:hover {
  background: var(--clr-accent);
  color: #fff;
  border-color: var(--clr-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(14, 165, 233, 0.35);
}

/* ── QR Generator Section ──────────────────────────────────── */
.qr-section {
  padding-block: var(--sp-16);
}

.qr-card {
  background: var(--clr-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-10) var(--sp-12);
  max-width: 620px;
  margin-inline: auto;
  border: 1px solid rgba(79, 70, 229, 0.08);
}

.qr-card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--sp-2);
  letter-spacing: -0.02em;
}

.qr-card-subtitle {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-8);
}

/* Input Group */
.qr-form-group {
  margin-bottom: var(--sp-6);
}

.input-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-text);
  margin-bottom: var(--sp-2);
  letter-spacing: 0.01em;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: var(--sp-4);
  width: 18px;
  height: 18px;
  color: var(--clr-text-muted);
  flex-shrink: 0;
  pointer-events: none;
  z-index: 1;
}

.url-input {
  width: 100%;
  padding: var(--sp-4) var(--sp-10) var(--sp-4) calc(var(--sp-4) + 18px + var(--sp-3));
  font-size: 0.95rem;
  color: var(--clr-text);
  background: var(--clr-surface-2);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}

.url-input::placeholder { color: #94a3b8; }

.url-input:focus {
  border-color: var(--clr-primary-light);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
  background: var(--clr-surface);
}

.url-input.input-error {
  border-color: var(--clr-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.10);
}

.btn-clear {
  position: absolute;
  right: var(--sp-3);
  background: none;
  border: none;
  padding: var(--sp-1);
  border-radius: var(--radius-full);
  color: var(--clr-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--t-fast), background var(--t-fast);
}

.btn-clear:hover {
  color: var(--clr-text);
  background: rgba(0, 0, 0, 0.06);
}

.btn-clear svg { width: 16px; height: 16px; }

/* Error */
.qr-error {
  margin-top: var(--sp-2);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--clr-error);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

/* Generate Button */
.btn-generate {
  width: 100%;
  padding: var(--sp-4);
  font-size: 1rem;
  border-radius: var(--radius-md);
  gap: var(--sp-3);
}

.btn-generate svg {
  width: 20px;
  height: 20px;
}

/* QR Output */
.qr-output {
  margin-top: var(--sp-8);
  text-align: center;
  animation: fadeSlideUp var(--t-slow) forwards;
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.qr-result-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-4);
}

.qr-display {
  display: inline-block;
  padding: var(--sp-5);
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--clr-border);
  margin-bottom: var(--sp-4);
}

#qr-canvas {
  display: block;
  border-radius: var(--sp-2);
}

.qr-url-display {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-6);
  word-break: break-all;
  padding-inline: var(--sp-4);
  opacity: 0.8;
}

.download-buttons {
  display: flex;
  gap: var(--sp-3);
}

/* ── Features Section ──────────────────────────────────────── */
.features-section {
  padding-block: var(--sp-20);
  background: var(--clr-surface);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--sp-12);
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--clr-text);
  margin-bottom: var(--sp-4);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--sp-6);
}

.feature-card {
  background: var(--clr-surface-2);
  border-radius: var(--radius-lg);
  padding: var(--sp-8);
  border: 1px solid var(--clr-border);
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 70, 229, 0.15);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--sp-5);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-icon--blue   { background: rgba(59, 130, 246, 0.12); color: var(--clr-blue); }
.feature-icon--green  { background: rgba(16, 185, 129, 0.12); color: var(--clr-green); }
.feature-icon--purple { background: rgba(139, 92, 246, 0.12); color: var(--clr-purple); }
.feature-icon--orange { background: rgba(249, 115, 22, 0.12); color: var(--clr-orange); }
.feature-icon--cyan   { background: rgba(6, 182, 212, 0.12);  color: var(--clr-cyan); }
.feature-icon--red    { background: rgba(239, 68, 68, 0.12);  color: var(--clr-red); }

.feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--sp-3);
}

.feature-text {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
}

/* ── How-to Section ────────────────────────────────────────── */
.howto-section {
  padding-block: var(--sp-20);
  background: var(--gradient-hero);
}

.howto-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  flex-wrap: wrap;
  justify-content: center;
}

.howto-step {
  flex: 1;
  min-width: 200px;
  max-width: 300px;
  text-align: center;
  padding: var(--sp-8) var(--sp-6);
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-inline: auto;
  margin-bottom: var(--sp-5);
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--sp-3);
}

.step-text {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
}

.step-text code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: rgba(79, 70, 229, 0.08);
  color: var(--clr-primary);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
}

.howto-connector {
  flex-shrink: 0;
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-primary-light), var(--clr-accent));
  align-self: center;
  margin-top: -30px;
  border-radius: var(--radius-full);
  opacity: 0.4;
}

/* ── Use Cases ─────────────────────────────────────────────── */
.usecases-section {
  padding-block: var(--sp-20);
  background: var(--clr-surface);
}

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--sp-4);
}

.usecase-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--sp-3);
  padding: var(--sp-6);
  background: var(--clr-surface-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  transition: transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
}

.usecase-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(79, 70, 229, 0.2);
}

.usecase-icon {
  font-size: 2rem;
  line-height: 1;
}

.usecase-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-text);
  line-height: 1.4;
}

.usecase-label small {
  display: block;
  font-weight: 400;
  color: var(--clr-text-muted);
  font-size: 0.78rem;
  margin-top: 2px;
}

/* ── Info Section ──────────────────────────────────────────── */
.info-section {
  padding-block: var(--sp-20);
  background: var(--clr-bg);
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-12);
  align-items: center;
}

.info-text h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: var(--sp-4);
}

.info-text p {
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  margin-bottom: var(--sp-5);
}

.info-text strong { color: var(--clr-text); }

.info-text .btn-outline {
  margin-top: var(--sp-2);
}

/* QR Demo visual */
.info-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.info-qr-placeholder {
  width: 200px;
  height: 200px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-5);
}

.qr-demo-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  width: 100%;
  aspect-ratio: 1;
}

.qr-demo-cell {
  border-radius: 1px;
  background: var(--clr-border);
}

.qr-demo-cell.filled {
  background: var(--clr-text);
}

/* ── Page Header (inner pages) ─────────────────────────────── */
.page-header {
  background: var(--gradient-hero);
  padding-block: var(--sp-16) var(--sp-12);
  border-bottom: 1px solid rgba(79, 70, 229, 0.08);
}

.page-header .container {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  flex-direction: column;
}

.page-header-icon {
  font-size: 2.5rem;
  line-height: 1;
}

.page-header h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--sp-2);
}

.page-header p {
  font-size: 1rem;
  color: var(--clr-text-muted);
  max-width: 560px;
}

/* ── Content Page ──────────────────────────────────────────── */
.content-section {
  padding-block: var(--sp-16);
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-8);
  max-width: 820px;
  margin-inline: auto;
}

.content-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-8);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
}

.content-card h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 2px solid rgba(79, 70, 229, 0.1);
}

.content-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--clr-text);
  margin-top: var(--sp-5);
  margin-bottom: var(--sp-3);
}

.content-card p {
  font-size: 0.93rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  margin-bottom: var(--sp-4);
}

.content-card p:last-child { margin-bottom: 0; }

.content-card ul,
.content-card ol {
  font-size: 0.93rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  padding-left: var(--sp-6);
  margin-bottom: var(--sp-4);
}

.content-card li { margin-bottom: var(--sp-1); }

.content-card a {
  color: var(--clr-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content-card address { font-style: normal; }

.placeholder {
  color: var(--clr-error);
  font-weight: 500;
}

/* ── Contact Section (Startseite) ─────────────────────────── */
.contact-section {
  padding-block: var(--sp-20);
  background: var(--clr-surface);
}

.contact-section .section-header .section-title {
  color: var(--clr-text);
}

.contact-section .section-header .section-subtitle {
  color: var(--clr-text-muted);
}

/* ── Contact Form ──────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--sp-8);
  align-items: start;
}

.contact-info-card {
  background: var(--gradient-primary);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--sp-8);
}

.contact-info-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--sp-6);
}

.contact-info-item {
  display: flex;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  align-items: flex-start;
}

.contact-info-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-info-text {
  font-size: 0.88rem;
  opacity: 0.9;
  line-height: 1.6;
}

.contact-form-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-8);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: var(--sp-5);
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-text);
  margin-bottom: var(--sp-2);
}

.form-control {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.93rem;
  color: var(--clr-text);
  background: var(--clr-surface-2);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.form-control:focus {
  border-color: var(--clr-primary-light);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.10);
  background: var(--clr-surface);
}

textarea.form-control {
  resize: vertical;
  min-height: 130px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}

.form-submit {
  width: 100%;
  padding: var(--sp-4);
  font-size: 1rem;
  border-radius: var(--radius-md);
}

.form-notice {
  font-size: 0.78rem;
  color: var(--clr-text-muted);
  margin-top: var(--sp-3);
  text-align: center;
}

/* Form feedback */
#form-feedback {
  padding: var(--sp-4);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--sp-5);
}

#form-feedback.success {
  background: rgba(16, 185, 129, 0.1);
  color: #065f46;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

#form-feedback.error {
  background: rgba(239, 68, 68, 0.08);
  color: #991b1b;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--clr-text);
  color: rgba(255, 255, 255, 0.7);
  padding-top: var(--sp-16);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--sp-8);
  padding-inline: var(--sp-8);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-bottom: var(--sp-12);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.footer-logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
}

.footer-logo-img {
  height: 36px;
  width: auto;
  border-radius: 6px;
  flex-shrink: 0;
}

.footer-logo-text {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.footer-tagline {
  font-size: 0.85rem;
  opacity: 0.6;
}

.footer-links-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: var(--sp-4);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.footer-nav a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: color var(--t-fast);
}

.footer-nav a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--sp-6) var(--sp-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-3);
  max-width: var(--container-max);
  margin-inline: auto;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
}

/* Footer Credit (required by project spec) */
.footer-credit {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-credit-link {
  color: inherit;
  text-decoration: none;
  border: 1px solid transparent;
  padding: 0.1em 0.35em;
  border-radius: 3px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.footer-credit-link:hover {
  color: #ff6b6b;
  border-color: #ff6b6b;
  background: rgba(255, 107, 107, 0.08);
}

/* ── Scroll-to-top ─────────────────────────────────────────── */
.scroll-top {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  z-index: 90;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--gradient-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.40);
  transition: opacity var(--t-base), transform var(--t-base), box-shadow var(--t-base);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
}

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

.scroll-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.55);
}

.scroll-top svg {
  width: 20px;
  height: 20px;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .info-grid {
    grid-template-columns: 1fr;
  }

  .info-visual { display: none; }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand { grid-column: 1 / -1; }

  .howto-connector { display: none; }

  .howto-steps {
    flex-direction: column;
    align-items: center;
  }

  .howto-step { max-width: 100%; text-align: left; }
}

@media (max-width: 640px) {
  :root {
    --header-h: 62px;
  }

  .site-header {
    padding-inline: var(--sp-4);
  }

  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--sp-4);
    gap: var(--sp-2);
    border-bottom: 1px solid var(--clr-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-110%);
    transition: transform var(--t-slow);
    z-index: 99;
  }

  .site-nav.open { transform: translateY(0); }

  .nav-link {
    width: 100%;
    padding: var(--sp-3) var(--sp-4);
    border-radius: var(--radius-md);
  }

  .qr-card {
    padding: var(--sp-6);
    border-radius: var(--radius-lg);
  }

  .download-buttons {
    flex-direction: column;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .usecases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-brand { grid-column: auto; }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 380px) {
  .usecases-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   Admin-Bereich
   ============================================================ */

.admin-body { background: #f1f5f9; min-height: 100vh; }

/* ── Login ── */
.admin-login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6);
  background: var(--gradient-hero);
}

.admin-login-card {
  background: var(--clr-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-10) var(--sp-12);
  width: min(420px, 100%);
  border: 1px solid rgba(79,70,229,0.08);
}

.admin-login-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-primary);
  margin-bottom: var(--sp-6);
}

.admin-login-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-6);
}

.admin-login-form { display: flex; flex-direction: column; gap: var(--sp-4); }

.admin-back-link { text-align: center; margin-top: var(--sp-5); font-size: 0.85rem; }
.admin-back-link a { color: var(--clr-text-muted); text-decoration: none; transition: color var(--t-fast); }
.admin-back-link a:hover { color: var(--clr-primary); }

/* ── Alerts ── */
.admin-alert {
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: var(--sp-5);
}

.admin-alert--error   { background: rgba(239,68,68,0.08);  color: #991b1b; border: 1px solid rgba(239,68,68,0.2); }
.admin-alert--warning { background: rgba(245,158,11,0.08); color: #92400e; border: 1px solid rgba(245,158,11,0.25); }
.admin-alert--success { background: rgba(16,185,129,0.08); color: #065f46; border: 1px solid rgba(16,185,129,0.25); }

/* ── Layout ── */
.admin-layout { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }

/* ── Sidebar ── */
.admin-sidebar {
  background: var(--clr-text);
  color: rgba(255,255,255,0.8);
  display: flex;
  flex-direction: column;
  padding: var(--sp-6) 0;
  position: sticky;
  top: 0;
  height: 100vh;
}

.admin-sidebar-brand {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  padding: 0 var(--sp-6) var(--sp-6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.admin-sidebar-nav { display: flex; flex-direction: column; gap: var(--sp-1); padding: 0 var(--sp-3); flex: 1; }

.admin-nav-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  transition: background var(--t-fast), color var(--t-fast);
}

.admin-nav-link:hover,
.admin-nav-link.active { background: rgba(255,255,255,0.08); color: #fff; }

.admin-sidebar-footer {
  padding: var(--sp-4) var(--sp-6) 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: var(--sp-4);
}

.admin-logout-btn {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  transition: color var(--t-fast);
  margin-bottom: var(--sp-3);
}

.admin-logout-btn:hover { color: #ff6b6b; }
.admin-version { font-size: 0.75rem; color: rgba(255,255,255,0.25); }

/* ── Main ── */
.admin-main { padding: var(--sp-8); overflow-x: auto; }

.admin-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-8);
}

.admin-page-title { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; color: var(--clr-text); }

.admin-user-badge {
  font-size: 0.82rem;
  background: rgba(79,70,229,0.08);
  color: var(--clr-primary);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-full);
  font-weight: 600;
  border: 1px solid rgba(79,70,229,0.15);
}

/* ── Stats ── */
.admin-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}

.admin-stat-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.admin-stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--clr-primary);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--sp-2);
}

.admin-stat-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Cards ── */
.admin-card {
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--sp-6);
  overflow: hidden;
}

.admin-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-5) var(--sp-6);
  border-bottom: 1px solid var(--clr-border);
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.admin-card-title { font-size: 1rem; font-weight: 700; color: var(--clr-text); padding: var(--sp-5) var(--sp-6); }
.admin-card > .admin-card-title { border-bottom: 1px solid var(--clr-border); }

.admin-card-actions { display: flex; gap: var(--sp-3); align-items: center; }

.admin-btn-sm { font-size: 0.8rem; padding: var(--sp-2) var(--sp-4); }

.admin-btn-danger {
  background: rgba(239,68,68,0.08);
  color: var(--clr-error);
  border: 1.5px solid rgba(239,68,68,0.25);
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t-fast);
}

.admin-btn-danger:hover { background: var(--clr-error); color: #fff; }

/* ── Top-URLs ── */
.admin-top-urls { padding: var(--sp-4) var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-2); }

.admin-top-url-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--clr-border);
  font-size: 0.88rem;
}

.admin-top-url-row:last-child { border-bottom: none; }
.admin-top-url-text { color: var(--clr-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.admin-top-url-badge { font-size: 0.78rem; font-weight: 700; background: rgba(79,70,229,0.1); color: var(--clr-primary); padding: 0.15em 0.6em; border-radius: var(--radius-full); flex-shrink: 0; }

/* ── Tabelle ── */
.admin-table-wrap { overflow-x: auto; }

.admin-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }

.admin-table th {
  background: #f8faff;
  text-align: left;
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-muted);
  border-bottom: 1px solid var(--clr-border);
  white-space: nowrap;
}

.admin-table td { padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid #f1f5f9; vertical-align: middle; color: var(--clr-text); }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: #f8faff; }

.admin-td-num  { color: var(--clr-text-muted); width: 50px; font-variant-numeric: tabular-nums; }
.admin-td-time { white-space: nowrap; font-variant-numeric: tabular-nums; }
.admin-td-ip   { font-family: var(--font-mono); font-size: 0.8rem; white-space: nowrap; }
.admin-td-url a { color: var(--clr-primary); text-decoration: none; }
.admin-td-url a:hover { text-decoration: underline; }
.admin-td-ua   { color: var(--clr-text-muted); font-size: 0.78rem; }
.admin-td-meta { color: var(--clr-text-muted); font-size: 0.82rem; white-space: nowrap; }

.admin-empty { padding: var(--sp-8); text-align: center; color: var(--clr-text-muted); font-size: 0.9rem; }

/* ── Paginierung ── */
.admin-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-6);
  border-top: 1px solid var(--clr-border);
}

.admin-page-btn {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-primary);
  text-decoration: none;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  border: 1.5px solid rgba(79,70,229,0.2);
  transition: all var(--t-fast);
}

.admin-page-btn:hover { background: var(--clr-primary); color: #fff; border-color: var(--clr-primary); }
.admin-page-info { font-size: 0.82rem; color: var(--clr-text-muted); }

/* ── Admin Responsive ── */
@media (max-width: 900px) {
  .admin-layout { grid-template-columns: 1fr; }
  .admin-sidebar { height: auto; position: static; flex-direction: row; flex-wrap: wrap; padding: var(--sp-4); }
  .admin-sidebar-nav { flex-direction: row; flex-wrap: wrap; }
  .admin-stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 540px) {
  .admin-stats-grid { grid-template-columns: 1fr 1fr; }
  .admin-main { padding: var(--sp-4); }
}

/* ── Protected Email ───────────────────────────────────────── */
.protected-email {
  display:         inline-flex;
  align-items:     center;
  gap:             var(--sp-1);
  cursor:          pointer;
  color:           var(--clr-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  border-radius:   var(--radius-sm);
  transition:      color var(--transition);
  outline-offset:  3px;
}

.protected-email:hover,
.protected-email:focus-visible {
  color: var(--clr-primary-dark);
}

.protected-email--light {
  color:           rgba(255, 255, 255, 0.9);
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

.protected-email--light:hover,
.protected-email--light:focus-visible {
  color: #fff;
}

.protected-email-icon {
  width:  1em;
  height: 1em;
  flex-shrink: 0;
}

/* ── E-Mail-Modal ───────────────────────────────────────────── */
.email-modal-overlay {
  position:        fixed;
  inset:           0;
  z-index:         2000;
  background:      rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  display:         flex;
  align-items:     center;
  justify-content: center;
  padding:         var(--sp-6);
}

.email-modal-overlay[hidden] { display: none; }

.email-modal-box {
  position:         relative;
  background:       var(--clr-surface);
  border-radius:    var(--radius-lg);
  box-shadow:       0 24px 64px rgba(15, 23, 42, 0.25);
  padding:          var(--sp-10) var(--sp-10) var(--sp-8);
  max-width:        520px;
  width:            100%;
  text-align:       center;
  animation:        modal-in 0.2s ease;
}

@keyframes modal-in {
  from { opacity: 0; transform: scale(0.94) translateY(12px); }
  to   { opacity: 1; transform: scale(1)    translateY(0);    }
}

.email-modal-close {
  position:   absolute;
  top:        var(--sp-3);
  right:      var(--sp-3);
  width:      2rem;
  height:     2rem;
  border:     none;
  background: transparent;
  cursor:     pointer;
  color:      var(--clr-text-muted);
  display:    flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.email-modal-close:hover { color: var(--clr-text); background: var(--clr-surface-2); }
.email-modal-close svg   { width: 1.1rem; height: 1.1rem; }

.email-modal-icon {
  width:         3.5rem;
  height:        3.5rem;
  margin:        0 auto var(--sp-4);
  background:    linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  border-radius: 50%;
  display:       flex;
  align-items:   center;
  justify-content: center;
  color:         #fff;
}

.email-modal-icon svg { width: 1.5rem; height: 1.5rem; }

.email-modal-title {
  font-size:   1.2rem;
  font-weight: 700;
  color:       var(--clr-text);
  margin:      0 0 var(--sp-2);
}

.email-modal-desc {
  font-size: 0.9rem;
  color:     var(--clr-text-muted);
  margin:    0 0 var(--sp-5);
  line-height: 1.5;
}

.email-modal-code-display {
  font-size:      2.5rem;
  font-weight:    800;
  letter-spacing: 0.3em;
  color:          var(--clr-primary);
  font-variant-numeric: tabular-nums;
  background:     var(--clr-surface-2);
  border:         2px solid var(--clr-border);
  border-radius:  var(--radius-md);
  padding:        var(--sp-3) var(--sp-6);
  margin:         0 auto var(--sp-5);
  display:        inline-block;
  min-width:      8rem;
  user-select:    none;
}

.email-modal-input-row {
  display:        flex;
  flex-direction: column;
  gap:            var(--sp-3);
  max-width:      280px;
  margin:         0 auto;
}

.email-modal-input {
  width:          100%;
  box-sizing:     border-box;
  text-align:     center;
  font-size:      1.4rem;
  font-weight:    700;
  letter-spacing: 0.2em;
  font-variant-numeric: tabular-nums;
  border:         2px solid var(--clr-border);
  border-radius:  var(--radius-md);
  padding:        var(--sp-2) var(--sp-3);
  background:     var(--clr-surface);
  color:          var(--clr-text);
  outline:        none;
  transition:     border-color var(--transition), box-shadow var(--transition);
}

.email-modal-input:focus {
  border-color: var(--clr-primary);
  box-shadow:   0 0 0 3px var(--clr-border-focus);
}

.email-modal-btn { width: 100%; }

.email-modal-error {
  margin-top: var(--sp-3);
  font-size:  0.85rem;
  color:      var(--clr-error);
  font-weight: 500;
}

.email-modal-result {
  margin-top:   var(--sp-5);
  padding:      var(--sp-4);
  background:   linear-gradient(135deg, rgba(79,70,229,.06), rgba(14,165,233,.06));
  border:       1px solid rgba(79,70,229,.15);
  border-radius: var(--radius-md);
}

.email-modal-success-label {
  display:     block;
  font-size:   0.8rem;
  color:       var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--sp-1);
}

.email-modal-address {
  font-size:   1.05rem;
  font-weight: 600;
  color:       var(--clr-primary);
  word-break:  break-all;
}

.email-modal-address:hover { color: var(--clr-primary-dark); }

body.modal-open { overflow: hidden; }

/* Shake-Animation bei falschem Code */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

.email-modal-input.shake { animation: shake 0.35s ease; }

/* ── Spam-Schutz: Honeypot-Feld ────────────────────────────── */
.hp-field {
  position: absolute;
  left:      -9999px;
  top:       -9999px;
  width:     1px;
  height:    1px;
  overflow:  hidden;
  opacity:   0;
  pointer-events: none;
  tab-index: -1;
}