/* ==========================================================================
   akru-starting-page-experiment
   Design Tokens & Stylesheet (OKLCH, CSS Nesting, Modern Reset, Glassmorphism)
   ========================================================================== */

/* 0. Self-Hosted Fonts (Zero CDN, Zero External Tracking, Fully Offline) */
@font-face {
  font-family: 'Rubik Dirt';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/rubik-dirt-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;
}

@font-face {
  font-family: 'Rubik Dirt';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/rubik-dirt-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: 'Nunito';
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url('assets/fonts/nunito-variable-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;
}

@font-face {
  font-family: 'Nunito';
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url('assets/fonts/nunito-variable-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;
}

/* 1. Design Tokens */
:root {
  /* OKLCH Color Palette (Extracted directly from theme-image.jpg) */
  --color-bg-base: oklch(0.14 0.06 285);        /* Deep cosmic midnight #0e0823 */
  --color-surface-dark: oklch(0.18 0.08 283);   /* Deep Indigo #1a0f45 */
  --color-surface-hover: oklch(0.24 0.10 282);  /* Slightly lighter surface */
  --color-primary: oklch(0.45 0.18 285);        /* Rich violet #5a38ad */
  --color-accent-violet: oklch(0.58 0.24 280);  /* Bright electric violet #6d53f6 */
  --color-accent-lavender: oklch(0.70 0.18 285);/* Soft bright lavender #9970f2 */
  --color-accent-rose: oklch(0.72 0.10 325);    /* Soft dusty rose #c087bf */

  /* Mask Green (Extracted directly from the face mask in the photo: #42a334 / #52ac41) */
  --color-mask-green: oklch(0.68 0.20 142);
  --color-mask-green-glow: oklch(0.68 0.20 142 / 0.45);
  --color-mask-green-hover: oklch(0.75 0.22 142);

  /* Text & Contrast (WCAG AA Compliant on --color-bg-base) */
  --color-text-main: oklch(0.96 0.02 285);      /* Bright crisp white/lavender */
  --color-text-muted: oklch(0.78 0.04 285);     /* Soft legible secondary text */
  --color-text-dim: oklch(0.60 0.05 285);       /* Subtle tertiary text */
  --color-focus-ring: var(--color-mask-green);

  /* Transparent Sidebar Tokens (20% subtle dark tint) */
  --glass-bg: rgba(0, 0, 0, 0.20);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-border-hover: rgba(255, 255, 255, 0.22);
  --glass-blur: blur(6px);
  --glass-shadow: none;

  /* Layout & Sidebar Metrics (Harmonisch für größeres Logo dimensioniert) */
  --sidebar-width: clamp(70px, 7vw, 92px);

  /* Fluid Spacing */
  --space-2xs: clamp(0.25rem, 0.4vw, 0.375rem);
  --space-xs: clamp(0.5rem, 0.8vw, 0.75rem);
  --space-sm: clamp(0.75rem, 1.2vw, 1rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2.25rem);
  --space-xl: clamp(2rem, 4vw, 3.5rem);

  /* Typography: Nunito for UI & Body, Rubik Dirt for Headings */
  --font-sans: 'Nunito', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Rubik Dirt', system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;

  /* Border Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  min-height: 100dvh;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  /* Lebendiger Ambient-Gradient-Mesh aus den Hauptfarben der Webseite */
  background-image:
    radial-gradient(ellipse 90% 65% at 20% -10%, oklch(0.55 0.25 280 / 0.42), transparent 70%),
    radial-gradient(ellipse 75% 55% at 85% 15%, oklch(0.48 0.20 295 / 0.36), transparent 65%),
    radial-gradient(circle 520px at 10% 50%, oklch(0.68 0.16 325 / 0.26), transparent 70%),
    radial-gradient(circle 480px at 85% 70%, oklch(0.58 0.24 280 / 0.32), transparent 70%),
    radial-gradient(ellipse 70% 45% at 45% 40%, oklch(0.68 0.20 142 / 0.10), transparent 65%),
    radial-gradient(ellipse 100% 70% at 50% 100%, oklch(0.22 0.12 282 / 0.85), transparent 85%);
  background-attachment: fixed;
  color: var(--color-text-main);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* Safe areas for mobile devices */
@supports (padding: env(safe-area-inset-top)) {
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* 3. Global Focus Rings (WCAG 2.2 AA) */
:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 4. Truly Transparent Floating Left Sidebar */
.glass-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  height: 100dvh;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: clamp(1.5rem, 4dvh, 3rem);
  padding: clamp(0.75rem, 1.6dvh, 1.25rem) var(--space-xs) var(--space-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: none;
  box-shadow: none;
  pointer-events: none;
  transition: width var(--transition-base), background-color var(--transition-base);

  & > * {
    pointer-events: auto;
  }
}

/* Sidebar Top: Pure White Logo */
.sidebar-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.brand-logo-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 4px;
  border-radius: 10px;
  transition: transform var(--transition-fast), filter var(--transition-fast);

  &:hover {
    transform: scale(1.08);
  }

  /* Logo styled in pure white with soft glow - enlarged */
  svg.brand-logo {
    width: clamp(46px, 5.2vw, 64px);
    height: auto;
    fill: #ffffff;
    filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.6)) drop-shadow(0 0 14px rgba(255, 255, 255, 0.45));
    transition: fill var(--transition-fast), filter var(--transition-fast);
  }

  &:hover svg.brand-logo {
    fill: #ffffff;
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.7)) drop-shadow(0 0 22px rgba(255, 255, 255, 0.8));
  }
}

/* Sidebar Middle: Borderless Social Media Navigation */
.sidebar-social-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px; /* WCAG Target Size: 44x44px */
  background: transparent;
  border: none;
  border-radius: 0;
  color: rgba(255, 255, 255, 0.82);
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.6));
  transition: color var(--transition-fast), transform var(--transition-fast), filter var(--transition-fast);

  svg {
    width: 22px;
    height: 22px;
    fill: currentColor;
    transition: transform var(--transition-fast);
  }

  &:hover {
    color: #ffffff;
    background: transparent;
    border: none;
    transform: scale(1.18);
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.7)) drop-shadow(0 0 14px rgba(255, 255, 255, 0.8));

    svg {
      transform: scale(1.06);
    }
  }
}

/* 5. Main Document Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  margin-left: 0;
  width: 100%;
}

/* 6. Hero Header (CSS Background-Image with 89.62% aspect-ratio vertical padding) */
.hero-header {
  position: relative;
  width: 100%;
  display: block;
  overflow: hidden;
  background-color: transparent;
}

.hero-image-container {
  position: relative;
  width: 100%;
  height: 0;
  /* 81.4128% aspect ratio (2501 / 3072 * 100%) - container grows strictly with image */
  padding-bottom: calc(2501 / 3072 * 100%);
  background-image: url('assets/theme-image-crop.jpg');
  background-image: -webkit-image-set(
    url('assets/theme-image-crop.webp') 1x,
    url('assets/theme-image-crop.jpg') 1x
  );
  background-image: image-set(
    url('assets/theme-image-crop.webp') type('image/webp'),
    url('assets/theme-image-crop.jpg') type('image/jpeg')
  );
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  overflow: hidden;
  /* Fließender Auslauf direkt in den Ambient-Gradient-Mesh */
  mask-image: linear-gradient(to bottom, black 0%, black 80%, transparent 98%);
  -webkit-mask-image: linear-gradient(to bottom, black 0%, black 80%, transparent 98%);
}

/* Dezent getönter Schleier, der das Bild organisch mit dem Gradient-Mesh verschmilzt */
.hero-gradient-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    transparent 74%,
    color-mix(in oklch, var(--color-bg-base) 35%, transparent) 90%,
    transparent 100%
  );
}

/* 7. Semantic Landing Page Main Content ("I'm just Akru") */
.main-content {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: min(100%, 82ch);
  /* Pushed cleanly to the bottom edge of the hero picture without negative overlap */
  margin: 0 auto;
  padding-top: var(--space-xs);
  padding-bottom: var(--space-xl);
  /* Symmetrisches Sicherheits-Padding, das eine Kollision mit der schwebenden Leiste mathematisch ausschließt */
  padding-left: max(clamp(1.5rem, 5vw, 4rem), calc(var(--sidebar-width) + 1.25rem));
  padding-right: max(clamp(1.5rem, 5vw, 4rem), calc(var(--sidebar-width) + 1.25rem));
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-sm);
}

.content-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw + 0.5rem, 4.4rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.15;
  background: linear-gradient(
    135deg,
    #ffffff 20%,
    var(--color-accent-lavender) 65%,
    var(--color-accent-rose) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  overflow-wrap: anywhere;
  filter: drop-shadow(0 4px 18px oklch(0.58 0.24 280 / 0.35));
}

.content-tagline {
  font-family: var(--font-sans);
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 54ch;
  overflow-wrap: anywhere;
  margin-top: 4px;
}

/* Personal Identity Tags (Glassmorphic Pills) */
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem 0.65rem;
  list-style: none;
  padding: 0;
  margin-top: var(--space-xs);
  max-width: 90%;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.95rem;
  font-family: var(--font-sans);
  font-size: clamp(0.82rem, 1.1vw, 0.94rem);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--color-text-main);
  background: color-mix(in oklch, var(--color-surface-dark) 45%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid color-mix(in oklch, var(--color-accent-lavender) 32%, transparent);
  border-radius: 9999px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  transition: all var(--transition-fast);
  user-select: none;

  &:hover {
    transform: translateY(-2px) scale(1.04);
    background: color-mix(in oklch, var(--color-accent-violet) 35%, transparent);
    border-color: var(--color-accent-lavender);
    box-shadow: 0 6px 18px oklch(0.58 0.24 280 / 0.40);
  }
}

.landing-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.action-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--color-text-main);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);

  svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
  }

  &:hover {
    background: color-mix(in oklch, var(--color-mask-green) 25%, transparent);
    border-color: var(--color-mask-green);
    transform: translateY(-2px);
    box-shadow: 0 8px 22px oklch(0.68 0.20 142 / 0.35);

    svg {
      transform: scale(1.12);
    }
  }
}

/* 8. Footer (Seamless without border line, with sidebar-clearance on narrower viewports) */
.app-footer {
  position: relative;
  z-index: 10;
  width: 100%;
  padding: var(--space-lg) clamp(1rem, 3.5vw, 2.5rem);
  text-align: center;
  color: var(--color-text-dim);
  font-size: 0.875rem;
  border-top: none;

  p {
    overflow-wrap: anywhere;
  }
}

@media (max-width: 760px) {
  .app-footer {
    padding-left: calc(var(--sidebar-width) + 1.25rem);
    padding-right: calc(var(--sidebar-width) + 1.25rem);
  }
}

/* 9. Responsiveness Down to 320px */
@media (max-width: 640px) {
  :root {
    --sidebar-width: 58px;
  }

  .brand-logo-link svg.brand-logo {
    width: 40px;
  }

  .glass-sidebar {
    padding: 0.75rem 4px var(--space-md);
    gap: var(--space-md);
  }

  .main-content {
    margin-top: 0;
    padding-left: calc(var(--sidebar-width) + 0.75rem);
    padding-right: calc(var(--sidebar-width) + 0.75rem);
  }

  .action-pill {
    padding: 8px 16px;
    font-size: 0.9rem;
  }
}

@media (max-width: 380px) {
  :root {
    --sidebar-width: 52px;
  }

  .brand-logo-link svg.brand-logo {
    width: 35px;
  }

  .glass-sidebar {
    padding: 0.5rem 2px var(--space-sm);
  }

  .main-content {
    padding-left: calc(var(--sidebar-width) + 0.5rem);
    padding-right: calc(var(--sidebar-width) + 0.5rem);
  }

  .content-title {
    font-size: clamp(1.6rem, 7.5vw, 2rem);
  }
}

/* 10. Motion Preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}