body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f7faff;
    margin: 0;
    padding: 0;
    color: #202A3B;
}
#header {
    position: fixed;
    top: 0; left: 0; width: 100vw;
    height: 74px;
    background: rgba(255,255,255,0.98);
    z-index: 1002;
    box-shadow: 0 1px 10px #153a7012;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    transition: height 0.3s;
}
.logo-wrapper {
    height: 54px;
    display: flex;
    align-items: center;
    transition: all 0.35s cubic-bezier(.86,0,.07,1);
}
#main-logo {
    max-width: 180px;
    height: 54px;
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 2px 8px #153a7010;
    transition: max-width 0.4s, height 0.4s, transform 0.4s, opacity 0.4s;
    opacity: 0;
    pointer-events: none;
}
/* Εμφανίζεται μόνο όταν κάνεις scroll */
#header.show-logo #main-logo {
    opacity: 1;
    pointer-events: auto;
    transform: scale(0.85) translateY(-2px);
}
.lang-switch {
    margin-left: auto;
    margin-right: 26px;
    display: flex;
    gap: 2px;
}
.lang-btn {
    background: #e2ebff;
    border: none;
    color: #2e63ec;
    padding: 5px 14px;
    border-radius: 8px;
    margin-left: 2px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s, color 0.2s;
}
.lang-btn.active {
    background: #2e63ec;
    color: #fff;
}
.hero {
    margin-top: 82px; /* όσο το ύψος του header + λίγο παραπάνω */
    text-align: center;
    padding: 62px 0 32px 0;
}
.hero-logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 22px;
    margin-bottom: 30px;
    transition: opacity 0.3s, transform 0.35s cubic-bezier(.86,0,.07,1);
}
#hero-logo {
    width: 70%;
    max-width: 90vw;
    height: auto;
    border-radius: 18px;
    box-shadow: 0 8px 32px #2e63ec23;
    background: #fff;
    padding: 14px 14px;
    transition: width 0.4s, opacity 0.3s, transform 0.35s;
}
/* Όταν κάνεις scroll το logo στο hero εξαφανίζεται */
.hero-logo-container.shrink {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.7) translateY(-50px);
}
.hero-title {
    font-size: 2.3em;
    color: #2e63ec;
    margin: 12px 0 0 0;
    letter-spacing: -1px;
    font-weight: 800;
    line-height: 1.14em;
}
.hero-desc {
    color: #444;
    font-size: 1.13em;
    max-width: 420px;
    margin: 18px auto 32px auto;
}
.cta-btn {
    background: linear-gradient(90deg, #53c7f9 0%, #2e63ec 100%);
    color: #fff;
    border: none;
    padding: 14px 38px;
    font-size: 1.1em;
    border-radius: 999px;
    font-weight: bold;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 16px #2e63ec33;
    cursor: pointer;
    transition: background 0.16s, box-shadow 0.16s;
}
.cta-btn:hover {
    background: linear-gradient(90deg, #2e63ec 0%, #53c7f9 100%);
    box-shadow: 0 6px 24px #2e63ec44;
}
.container {
    max-width: 740px;
    margin: 0 auto 0 auto;
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 4px 24px 0 #0001;
    padding: 38px 30px 40px 30px;
    position: relative;
}
.features-list {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin: 0 0 28px 0;
    padding: 0;
}
.feature {
    background: #f3f7ff;
    border-radius: 14px;
    flex: 1 1 200px;
    padding: 16px 14px 14px 16px;
    box-shadow: 0 1px 6px #b6d3f71f;
    min-width: 190px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.feature svg {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    margin-top: 2px;
    opacity: 0.8;
}
.feature-title {
    font-weight: 700;
    margin-bottom: 2px;
    color: #2252a3;
}
.section-title {
    font-size: 1.25em;
    font-weight: bold;
    margin: 30px 0 10px 0;
}
.whyus-list {
    margin-top: 6px;
    padding-left: 1.2em;
}
.contact {
    margin-top: 28px;
    padding: 14px 16px;
    background: #f1f7ff;
    border-radius: 10px;
    font-size: 1.08em;
}
.footer {
    text-align: center;
    margin: 38px auto 0 auto;
    font-size: 1em;
    color: #7a869c;
}
.footer a { color: #357cfc; text-decoration: none; margin: 0 6px; }
.footer a:hover { text-decoration: underline; }
@media (max-width: 900px) {
    .container { padding: 16px 4vw 32px 4vw; }
}
@media (max-width: 700px) {
    .container { padding: 10px 2vw 24px 2vw; }
    .hero { padding: 32px 4vw 18px 4vw; }
    .hero-title { font-size: 1.45em; }
    .hero-desc { font-size: 1em; }
    #header { height: 54px; }
    #main-logo { max-width: 44px; height: 30px; }
    #hero-logo { width: 80vw; }
}
.facebook-btn {
  display: inline-flex;
  align-items: center;
  background: #1877f3;
  color: #fff;
  border-radius: 7px;
  font-weight: 600;
  padding: 7px 16px;
  text-decoration: none;
  font-size: 1.08rem;
  box-shadow: 0 2px 12px #0002;
  margin: 6px 0;
  transition: background 0.2s, transform 0.15s;
}
.facebook-btn:hover {
  background: #0e5ab8;
  transform: translateY(-2px) scale(1.04);
  text-decoration: none;
}
.linkedin-btn {
  display: inline-flex;
  align-items: center;
  background: #0077b5;
  color: #fff;
  border-radius: 7px;
  font-weight: 600;
  padding: 7px 16px;
  text-decoration: none;
  font-size: 1.08rem;
  box-shadow: 0 2px 12px #0002;
  margin: 6px 0 6px 12px;
  transition: background 0.2s, transform 0.15s;
}
.linkedin-btn:hover {
  background: #004471;
  transform: translateY(-2px) scale(1.04);
  text-decoration: none;
}
.social-center {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin: 38px 0 0 0;
  flex-wrap: wrap;
}
#contact h2 {
  text-align: center;
}
.youtube-btn {
  display: inline-flex;
  align-items: center;
  background: #ff0000;
  color: #fff;
  border-radius: 7px;
  font-weight: 600;
  padding: 7px 16px;
  text-decoration: none;
  font-size: 1.08rem;
  box-shadow: 0 2px 12px #0002;
  margin: 6px 0 6px 12px;
  transition: background 0.2s, transform 0.15s;
}
.youtube-btn:hover {
  background: #b10000;
  transform: translateY(-2px) scale(1.04);
  text-decoration: none;
}
.mail-btn {
  display: inline-flex;
  align-items: center;
  background: #03bafc;
  color: #fff;
  border-radius: 7px;
  font-weight: 600;
  padding: 7px 16px;
  text-decoration: none;
  font-size: 1.08rem;
  box-shadow: 0 2px 12px #0002;
  margin: 6px 0 6px 12px;
  transition: background 0.2s, transform 0.15s;
}
.mail-btn:hover {
  background: #0285b3;
  transform: translateY(-2px) scale(1.04);
  text-decoration: none;
}