/*GLOBAL*/
:root {
  /* Colors */
  --color-ink: #12120d;
  --color-surface: rgb(255 255 255 / 0.95);
  --color-surface-dim: rgb(255 255 255 / 0.5);
  --color-border: rgb(0 0 0 / 0.9);
  --color-border-input: rgb(0 0 0 / 0.7);
  --color-border-light: rgb(0 0 0 / 0.25);
  --color-shadow: rgb(0 0 0 / 0.5);
  --color-success: #0f6b37;
  --color-error: #982020;

  /* Layout */
  --content-width: 580px;
  --border-accent-width-menu: 1px 5px 1px 1px;
  --border-accent-width: 1px 5px 5px 1px;
  --nav-height: 90px;

  /* Typography */
  --font-size-body: 20px;
  --font-size-sm: 16px;
  --font-size-lead: 30px;
  --font-size-date: 24px;

  /* Motion */
  --duration-fast: 180ms;
  --duration-base: 280ms;
  --duration-medium: 240ms;
}

@view-transition {
  navigation: auto;
}

@keyframes page-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes page-fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes page-slide-in {
  from {
    transform: translateY(10px);
  }
  to {
    transform: translateY(0);
  }
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  overflow-x: clip;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
}

::view-transition-old(page-main) {
  animation: page-fade-out var(--duration-fast) ease;
}

::view-transition-new(page-main) {
  animation:
    page-fade-in var(--duration-base) ease,
    page-slide-in var(--duration-base) ease;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}

body {
  font-family: "GT Walsheim", sans-serif;
  font-size: var(--font-size-body);
  line-height: 1.3;
}

body:not(#landing)::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url("../img/main-bg.jpeg") center / cover no-repeat;
}

h2 {
  font-size: var(--font-size-body);
  font-weight: 400;
  text-transform: uppercase;
  line-height: 2.5;
  letter-spacing: 4px;
  position: relative;
  display: inline-block;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-medium) ease;
}

a,
a:focus,
a:active {
  color: var(--color-ink);
}

#art:target h2,
#essen:target h2,
#dresscode:target h2,
#mitbringsel:target h2,
#anreise:target h2 {
  &::after {
    transform: scaleX(1);
    top: 40px;
  }
}

p {
  margin-top: 0;
  margin-bottom: 40px;

  span {
    display: block;
    margin-bottom: 11px;
  }
}

/*LANDING/LOGIN*/
#landing {
  .login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding-top: 10%;

    .image {
      width: 100%;
      max-width: 550px;
      min-width: 300px;
    }
    form {
      display: flex;
      flex-direction: column;
      justify-content: center;
      width: min(90vw, 24rem);

      button {
        display: flex;
        justify-content: center;
        margin-top: 10px;
      }
      .login-input {
        font-size: 12px;
        font-weight: 700;
        margin-top: 40px;
        text-align: center;
        width: 60%;
        margin-inline: auto;
        box-sizing: border-box;
        border: none;
        border-bottom: 1px solid rgb(0 0 0);
        text-transform: uppercase;
        letter-spacing: 2px;
      }
      .login-input:focus {
        outline: none;
        box-shadow: none;
      }
      .login-submit {
        display: inline-flex;
        width: fit-content;
        align-self: center;
        margin-top: 10px;
        background: none;
        border: 0;
        padding: 0;
        cursor: pointer;
        line-height: 0;
      }
      .login-submit img {
        display: block;
        width: 2.5rem;
        height: auto;
        transition:
          transform var(--duration-fast) ease,
          filter var(--duration-fast) ease,
          opacity var(--duration-fast) ease;
      }
      .login-submit:hover img,
      .login-submit:focus-visible img {
        filter: brightness(1.5);
        opacity: 0.9;
      }
    }
    .error {
      transition: all 2s;
      opacity: 0;
      text-align: center;
      background-color: red;
      color: white;
      box-shadow: 0 1px 4px rgb(0 0 0 / 0.1);
      margin-top: 24px;
    }
  }
}

/*MAIN*/
#main {
  min-height: 100vh;
  scroll-behavior: smooth;

  nav {
    position: fixed;
    top: 0px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: flex;
    flex-direction: row;
    justify-content: center;
    width: var(--content-width);
    max-width: 100%;
    padding: 18px 12px;
    border: 1px solid var(--color-border);
    border-width: var(--border-accent-width-menu);
    box-shadow: 0 2px 8px var(--color-shadow);
    background: var(--color-surface);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 2px;

    #menu {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 20px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    #menu a {
      text-decoration: none;
      color: inherit;
      position: relative;
    }
    #menu a::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 1px;
      background: currentColor;
      transform: scaleX(0);
      transform-origin: left;
      transition: transform var(--duration-medium) ease;
    }
    #menu a:hover::after,
    #menu a[aria-current]::after {
      transform: scaleX(1);
    }
  }

  &:not(.is-register):not(:has(:target)) #menu a[href="#art"]::after,
  &:not(.is-register):not(:has(:target)) #art h2::after {
    transform: scaleX(1);
  }

  &:has(#art:target) #menu a[href="#art"]::after,
  &:has(#essen:target) #menu a[href="#essen"]::after,
  &:has(#dresscode:target) #menu a[href="#dresscode"]::after,
  &:has(#mitbringsel:target) #menu a[href="#mitbringsel"]::after,
  &:has(#anreise:target) #menu a[href="#anreise"]::after {
    transform: scaleX(1);
  }

  section {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  main {
    view-transition-name: page-main;
    margin-top: 200px;
    margin-bottom: 500px;
    width: var(--content-width);
    max-width: 100%;
    background-color: var(--color-surface);
    border: solid var(--color-border);
    border-width: var(--border-accent-width);
    padding: 32px;

    #lead {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-bottom: 50px;
      .lead-title {
        display: block;
        width: 100%;
        height: auto;
        margin-bottom: 20px;
      }
      .date {
        font-size: var(--font-size-date);
        margin-bottom: 20px;
        letter-spacing: 8px;
      }
      .subtitle {
        font-size: var(--font-size-date);
        text-align: center;
        text-transform: uppercase;
        letter-spacing: 8px;
      }
      .lead {
        margin-top: 50px;
        font-family: "Noto Serif", serif;
        font-weight: 600;
        font-size: var(--font-size-lead);
        letter-spacing: 1px;
      }
    }
    #kontakt {
      margin-top: 100px;
      .kontakt-lead {
        font-family: "Noto Serif", serif;
        font-weight: 600;
        font-size: var(--font-size-lead);
        letter-spacing: 1px;
      }
      span {
        text-transform: uppercase;
        letter-spacing: 4px;
      }
    }
  }
}

#main.is-register {
  main {
    margin-bottom: 160px;
  }

  #lead {
    align-items: start;
  }

  .register-title {
    text-transform: uppercase;
    text-align: left;
    letter-spacing: 4px;
    margin-bottom: 11px;
  }

  .register-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .register-form.is-collapsing {
    overflow: hidden;
    transition:
      height var(--duration-base) ease,
      max-height var(--duration-base) ease,
      opacity var(--duration-base) ease,
      transform var(--duration-base) ease;
  }

  .register-form.is-collapsed {
    height: 0;
    max-height: 0;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
  }

  .form-success-heart {
    margin: 16px auto 0;
    text-align: center;
    font-size: 24px;
    line-height: 1;
  }

  .register-form fieldset {
    margin: 0 0 20px 0;
    padding: 14px 0;
    border: none;
    background: var(--color-surface-dim);
    label {
      font-size: var(--font-size-body);
      text-transform: none;
      padding-top: 0;
      letter-spacing: 0;
      line-height: var(--font-size-body);
    }
  }

  .register-form legend {
    font-size: var(--font-size-body);
    text-transform: uppercase;
    margin-bottom: 4px;
    padding: 0 6px;
    letter-spacing: 4px;
  }

  .choice-group {
    display: grid;
    gap: 10px;
  }

  .choice-group label {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .register-form label {
    font-size: var(--font-size-body);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding-top: 10px;
    letter-spacing: 4px;
  }

  .register-form input,
  .register-form textarea,
  .register-submit {
    width: 100%;
    font: inherit;
    border: 1px solid var(--color-border-input);
    background: var(--color-surface);
    padding: 10px 12px;
    box-sizing: border-box;
  }

  .register-form input[type="radio"] {
    width: auto;
    accent-color: var(--color-ink);
    padding: 0;
  }

  .register-form textarea {
    resize: vertical;
    min-height: 90px;
  }

  .register-submit {
    background: var(--color-ink);
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: opacity var(--duration-fast) ease;
    box-shadow:
      0 0 0 1px #000,
      inset 0 0 0 2px #fff;
  }

  .register-submit:hover,
  .register-submit:focus-visible {
    opacity: 0.88;
  }

  .register-submit:disabled {
    cursor: wait;
    opacity: 0.55;
  }

  .register-contact-hint {
    margin-top: 30px;
  }

  .form-feedback {
    margin: 8px 0 0;
    min-height: 1.3em;
    font-size: var(--font-size-sm);
  }

  .form-feedback.is-success {
    color: var(--color-success);
  }

  .form-feedback.is-error {
    color: var(--color-error);
  }
}

/* Hamburger — hidden on desktop */
#menu-toggle {
  display: none;
}

/*
 * Desktop: override UA popover stylesheet's
 *   [popover]:not(:popover-open) { display: none }
 * and reset any other UA [popover] base styles so the menu
 * always renders inline as a normal flex list.
 */
@media (min-width: 641px) {
  #menu {
    display: flex;
    position: static;
    inset: auto;
    width: auto;
    height: auto;
    overflow: visible;
    margin: 0;
    padding: 0;
    border: none;
    background-color: transparent;
    color: inherit;
  }
}

/* Mobile */
@media (max-width: 640px) {
  /* Override the unconditional display:flex from the nested #main nav #menu rule */
  #main #menu:not(:popover-open) {
    display: none;
  }

  #main nav {
    left: 0;
    right: 0;
    transform: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    anchor-name: --main-nav;
  }

  #main #menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 100%;
    padding: 16px 20px;
    background: none;
    border: none;
    cursor: pointer;

    span {
      display: block;
      height: 1.5px;
      width: 22px;
      background: var(--color-ink);
      transition:
        transform var(--duration-fast) ease,
        opacity var(--duration-fast) ease;
      transform-origin: center;
    }
  }

  /* × animation — CSS-only via :has() + :popover-open */
  #main nav:has(#menu:popover-open) #menu-toggle span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
  }
  #main nav:has(#menu:popover-open) #menu-toggle span:nth-child(2) {
    opacity: 0;
  }
  #main nav:has(#menu:popover-open) #menu-toggle span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
  }

  /*
   * Popover menu (top-layer when open).
   * Anchor positioning pins it directly below the nav bar.
   * Specificity (2,1,0) beats the desktop nested rule (2,0,1),
   * so column layout + full-width always wins on mobile.
   */
  #main #menu:popover-open {
    position: fixed;
    position-anchor: --main-nav;
    top: anchor(bottom);
    left: anchor(left);
    width: anchor-size(width);
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 8px 0 16px;
    border: none;
    border-top: 1px solid var(--color-border-light);
    background: var(--color-surface);
    box-shadow: 0 4px 12px var(--color-shadow);
    list-style: none;
    opacity: 1;
    transform: translateY(0);
    transition:
      opacity var(--duration-fast) ease,
      transform var(--duration-fast) ease,
      display var(--duration-fast) allow-discrete;

    @starting-style {
      opacity: 0;
      transform: translateY(-6px);
    }

    li {
      width: 100%;
    }

    a {
      display: block;
      padding: 10px 20px;
    }

    a::after {
      display: none;
    }
  }

  #main main {
    width: 100%;
    padding: 20px;
    margin-top: 300px;
    margin-bottom: 300px;
  }
}

/*UTILITY*/
.visually-hidden {
  visibility: hidden;
  height: 0;
  width: 0;
  overflow: hidden;
}