:root {
  --color-white: #fff;
  --color-black: #000;
  --color-bg: #f8fafc;
  --color-bg-alt: #fff;
  --color-primary: #0d5eaf;
  --color-primary-hover: #05478e;
  --color-secondary: #6c757d;
  --color-secondary-hover: #5a6268;
  --color-text: #222b45;
  --color-text-secondary: #636f88;
  --color-border: #e3e6ee;
  --radius: 0.5rem;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.07);
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header and Navbar */
.header {
  width: 100%;
  background: var(--color-bg-alt);
  box-shadow: var(--shadow);
  z-index: 100;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}

.nav__brand {
  display: flex;
  align-items: center;
}

.nav__logo {
  height: 48px;
  width: auto;
  margin-right: 14px;
  border-radius: 6px;
  background: #fff;
  border: 1px solid var(--color-primary);
  padding: 2px;
}

.nav__title {
  margin: 0 0 2px 0;
  font-size: 1.45rem;
  color: var(--color-primary);
}

.nav__subtitle {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav__link {
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color 0.2s;
  font-weight: 500;
  font-size: 1rem;
  padding: 7px 16px;
  border-radius: 18px;
}

.nav__link:hover,
.nav__link.active {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Buttons */
.btn {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius);
  padding: 9px 22px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  margin-left: 5px;
  transition: background 0.15s;
}
.btn:hover {
  background: var(--color-primary-hover);
}
.btn--outline {
  border: 1px solid var(--color-primary);
  background: none;
  color: var(--color-primary);
}
.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn--primary { background: var(--color-primary);}
.btn--secondary { background: var(--color-secondary);}
.btn--sm { font-size: 0.92rem; padding: 7px 13px; }
.btn--lg { font-size: 1.13rem; padding: 15px 28px; }

/* Section: Hero */
.hero {
  background: var(--color-bg-alt);
  padding: 110px 0 40px 0;
  text-align: center;
}

.hero__title {
  font-size: 2.3rem;
  font-weight: bold;
  margin: 0;
  color: var(--color-primary);
}

.hero__subtitle {
  font-size: 1.25rem;
  opacity: 0.85;
  margin: 0 0 9px 0;
  font-weight: 500;
}

.hero__description {
  max-width: 660px;
  margin: 0 auto 2.2rem auto;
  font-size: 1.11rem;
  color: var(--color-text-secondary);
}

.hero__actions { display: flex; gap: 1.25rem; justify-content: center; }

/* Categories */
.categories { background: var(--color-bg); padding: 38px 0 20px 0; }
.categories__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(275px,1fr));
  gap: 28px;
}
.category-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  padding: 30px 17px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: box-shadow 0.18s;
}
.category-card:hover { box-shadow: 0 4px 16px rgba(13,94,175,0.11);}
.category-card__icon {font-size: 2.5rem; margin-bottom: 18px;}
.category-card__title {font-size: 1.18rem; margin-top: 0;}
.category-card__description {color: var(--color-text-secondary); font-size: 0.98rem;}

/* Seminars (Cards) */
.featured-seminars,
.seminars-section { padding: 34px 0 28px 0; }
.seminars__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(340px,1fr));
  gap: 25px;
}

.seminar-card {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 22px;
  cursor: pointer;
  transition: box-shadow 0.17s;
  border: 1px solid var(--color-border);
}

.seminar-card:hover { box-shadow: 0 3px 15px rgba(13,94,175,0.12);}
.seminar-card__header {margin-bottom: 6px;}
.seminar-card__category {
  display: inline-block;
  font-size: 0.92rem;
  color: var(--color-primary);
  background: #edf4fb;
  border-radius: 11px;
  padding: 2px 11px;
  margin-bottom: 3px;
}
.seminar-card__title { margin: 0 0 2px 0; font-size: 1.19rem; font-weight: 600;}
.seminar-card__meta { color: #6f7a8a; font-size: 0.95rem; margin: 1.5px 0 13px 0; }
.seminar-card__description {
  color: var(--color-text-secondary);
  font-size: 1.04rem;
  margin-bottom: 13px;
  min-height: 46px;
  overflow: hidden;
}
.seminar-card__footer {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 7px;
}

.section-title {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 18px 0;
}

.seminars-header {
  display: flex; flex-wrap: wrap;
  align-items: flex-end; justify-content: space-between; gap: 17px;
  margin-bottom: 23px;
}
.seminars-controls { display:flex; gap: 12px; }
.search-box input,
.filter-select {
  padding: 7px 13px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  font-size: 1rem;
}

@media (max-width: 670px) {
  .nav,
  .nav__menu {flex-direction: column; align-items: flex-start; gap: 6px;}
  .hero__actions {flex-direction: column;}
  .categories__grid,
  .seminars__grid {grid-template-columns: 1fr;}
}

@media (max-width: 900px) {
  .container {max-width: 98vw; padding: 0 7px;}
}

/* Contact/Forms */
.contact-section {background: var(--color-bg-alt); padding:32px 0 48px 0;}
.contact__content {
  display:grid; grid-template-columns:1fr 1fr; gap:32px; align-items: start;
}
@media (max-width: 800px) {.contact__content{grid-template-columns: 1fr;}}


.seminars-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.seminars-list li {
  background: #f9f9f9;
  border-left: 4px solid #0078d7;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 8px;
  line-height: 1.5;
}

/* (Add more responsive and modal styles as needed for your UX) */
.footer {
  background-color: #1f1f1f;
  color: #f5f5f5;
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer__content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: flex-start;
}

.footer__info h3 {
  margin-bottom: 0.3rem;
}

.footer__links a {
  display: block;
  color: #f5f5f5;
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.3s;
}

.footer__links a:hover {
  color: #0078d7;
}

.footer__contact a {
  color: #f5f5f5;
  text-decoration: none;
}

.footer__bottom {
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid #444;
  font-size: 0.9rem;
  color: #ccc;
}
/* Στυλ για τη λίστα των σεμιναρίων */
.seminars-list {
  display: flex;              /* Τα στοιχεία μπαίνουν στη σειρά */
  flex-wrap: wrap;            /* Αν δεν χωράνε, πάνε στην επόμενη γραμμή */
  gap: 1.5rem;                /* Απόσταση ανάμεσα στα κουτιά */
  list-style: none;           /* Αφαίρεση bullets */
  padding: 0;
  margin-top: 1.5rem;
}

/* Κάθε σεμινάριο να φαίνεται σαν "κουτί" */
.seminars-list li {
  background-color: #f5f5f5;  /* Απαλό γκρι φόντο */
  border-radius: 10px;
  padding: 1rem;
  flex: 1 1 45%;              /* Να πιάνει περίπου τη μισή σειρά */
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

/* Εφέ όταν περνάει ο δείκτης */
.seminars-list li:hover {
  transform: translateY(-4px);
}
/* Modal (popup) styling */
.modal {
  display: none; /* Κρυφό εξ ορισμού */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.6);
  justify-content: center;
  align-items: center;
}

.modal-content {
  background-color: #fff;
  padding: 2rem;
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
  animation: fadeIn 0.3s ease-in-out;
}

.modal-content h3 {
  margin-bottom: 1rem;
}

.close {
  position: absolute;
  right: 20px;
  top: 15px;
  font-size: 24px;
  cursor: pointer;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Ο δείκτης να δείχνει ότι είναι κλικαμπλ */
.seminar-item {
  cursor: pointer;
  transition: background 0.2s ease;
}
.seminar-item:hover {
  background-color: #e7f0ff;
}
/* ΕΝΟΤΗΤΑ ΕΠΙΚΟΙΝΩΝΙΑΣ */
.contact-section {
  background: #f9fafc;
  padding: 80px 0;
}

.contact-container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-title.center {
  text-align: center;
  margin-bottom: 50px;
  font-size: 2rem;
  font-weight: 700;
  color: #1a237e;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
}

/* Πληροφορίες */
.contact-info p {
  color: #444;
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.contact-details {
  list-style: none;
  padding: 0;
}

.contact-details li {
  margin-bottom: 12px;
  font-size: 1rem;
}

.contact-details a {
  color: #1a73e8;
  text-decoration: none;
}

.contact-details a:hover {
  text-decoration: underline;
}

/* ΦΟΡΜΑ */
.contact-form {
  background: #ffffff;
  padding: 30px 35px;
  border-radius: 12px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.contact-form h3 {
  text-align: center;
  margin-bottom: 20px;
  color: #1a237e;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: #333;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccd1d9;
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: #1a73e8;
  outline: none;
}

.btn--primary {
  background-color: #1a73e8;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  width: 100%;
  transition: background 0.3s ease;
}

.btn--primary:hover {
  background-color: #155ab6;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-form {
    margin-top: 20px;
  }
}