AISE_FS26-FrontendEntwicklungProjekt/css/main.css

/* =========================
   INTER FONT (Google Fonts)
========================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* =========================
   CSS CUSTOM PROPERTIES (Design Tokens)
========================= */
:root {
  --color-bg:           #f1f5f9;
  --color-surface:      #ffffff;
  --color-header:       #0f172a;
  --color-accent:       #0d9488;
  --color-accent-light: #14b8a6;
  --color-accent-dark:  #0f766e;
  --color-text:         #1e293b;
  --color-text-muted:   #64748b;
  --color-border:       #e2e8f0;
  --color-danger:       #ef4444;
  --color-success:      #10b981;

  --radius-xs:   6px;
  --radius-sm:   10px;
  --radius-md:   14px;
  --radius-card: 18px;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);

  --transition: 0.2s ease;
}

/* =========================
   RESET & BASIS
========================= */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

/* =========================
   KARTEN-ERSCHEINUNGS-ANIMATION
   Wird auf Event-Karten angewendet wenn sie ins DOM kommen
========================= */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Shimmer-Animation für Skeleton-Karten (transform statt background-position → GPU-composited) */
@keyframes shimmer {
  from { transform: translateX(-100%); }
  to   { transform: translateX(200%); }
}

/* =========================
   HEADER – Dunkel & Sticky
========================= */
.site-header {
  background-color: var(--color-header);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 1px 0 rgba(255,255,255,0.06), 0 2px 16px rgba(0,0,0,0.2);
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent-light);
  margin: 0;
  letter-spacing: -0.04em;
  -webkit-user-select: none;
  user-select: none;
}

.site-header .nav-link {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-xs);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

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

/* Anmeldebereich – nur noch Buttons */
#auth-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-btn-outline {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-xs);
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.header-btn-outline:hover {
  border-color: rgba(255,255,255,0.55);
  color: #fff;
}

.header-btn-accent {
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-xs);
  color: #fff;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}

.header-btn-accent:hover {
  background: var(--color-accent-dark);
  color: #fff;
}

/* Nutzerbereich (eingeloggt) */
#user-area {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

#user-name {
  color: rgba(255,255,255,0.85);
  font-size: 0.875rem;
  font-weight: 500;
}

/* =========================
   HAUPTINHALT
========================= */
main {
  min-height: calc(100vh - 200px);
}

/* =========================
   HERO-BEREICH (Suchsektion)
   Volle Breite, dunkler Gradient-Hintergrund
========================= */
.hero {
  background:
    radial-gradient(ellipse 70% 80% at 15% 60%, rgba(13,148,136,0.15) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 85% 20%, rgba(20,184,166,0.08) 0%, transparent 55%),
    linear-gradient(155deg, #0f172a 0%, #1a2744 45%, #0c1a2c 100%);
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

/* Dekoratives Gitternetz-Muster im Hintergrund */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero__text {
  text-align: center;
  margin-bottom: 2.5rem;
  position: relative;
}

.hero__title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.04em;
  margin: 0 0 0.625rem;
  line-height: 1.1;
}

/* Teal Akzent auf dem letzten Wort */
.hero__title span {
  color: var(--color-accent-light);
}

.hero__subtitle {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.5);
  margin: 0;
  font-weight: 400;
  letter-spacing: 0.01em;
}

/* Suchkarte – schwebend über dem Hero-Hintergrund */
.hero .search {
  background: rgba(255,255,255,0.98);
  border: none;
  border-radius: var(--radius-card);
  padding: 1.5rem 1.75rem;
  box-shadow:
    0 30px 80px rgba(0,0,0,0.4),
    0 8px 30px rgba(0,0,0,0.25),
    0 0 0 1px rgba(255,255,255,0.1);
  position: relative;
}

/* =========================
   SUCHFORMULAR
========================= */
.search__controls {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.search__controls .form-control,
.search__controls input[type="date"],
.search__controls select {
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.55rem 0.9rem;
  height: 42px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search__controls .form-control:focus,
.search__controls input[type="date"]:focus,
.search__controls select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(13,148,136,0.15);
  outline: none;
  background: var(--color-surface);
}

.search__controls label {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
}

#load-events {
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0 1.5rem;
  height: 42px;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

#load-events:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(13,148,136,0.35);
}

#load-events:active {
  transform: translateY(0);
}

/* =========================
   SECTION (EVENTS / SAVED / INVITATIONS)
========================= */
.events-section {
  padding: 2.5rem 0 1rem;
}

.events-section h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
}

/* =========================
   EVENT-GRID
========================= */
#event-list,
#saved-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#invitation-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 640px;
}

/* =========================
   EMPTY STATE
========================= */
.empty-state {
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--color-text-muted);
}

.empty-state__icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state__text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 0.375rem;
}

.empty-state__sub {
  font-size: 0.9rem;
  margin: 0;
}

/* =========================
   SKELETON LOADER
   Shimmer via ::after Pseudo-Element + transform (GPU-composited)
========================= */
.skeleton-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
  min-height: 180px;
  position: relative;
  overflow: hidden;
}

.skeleton-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.65) 50%,
    transparent 100%
  );
  transform: translateX(-100%);
  animation: shimmer 1.6s ease-in-out infinite;
  will-change: transform;
}

/* =========================
   FOOTER
========================= */
.site-footer {
  background-color: var(--color-header);
  color: rgba(255,255,255,0.35);
  font-size: 0.85rem;
  padding: 1.75rem 0;
  margin-top: 3rem;
}

.site-footer p {
  margin: 0;
}

/* =========================
   TABLET (≥768px)
========================= */
@media (min-width: 768px) {
  .search__controls {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
  }

  #city-input  { flex: 2; min-width: 160px; }
  #date-from,
  #date-to     { flex: 1; min-width: 130px; }
  #category-input { flex: 0 0 160px; }

  #event-list,
  #saved-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

/* =========================
   DESKTOP (≥1024px)
========================= */
@media (min-width: 1024px) {
  #event-list,
  #saved-list {
    grid-template-columns: repeat(3, 1fr);
  }
}