:root {
  /* İstenen Koyu Mavi Renk Kodu */
  --piri-reis-blue: #002c77;
  --text-light: white;
  --text-dark: #333;
  --background-light: #f8f9fa;
  --accent-dark: #002244;
}
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  color: var(--text-dark);
  background-color: white;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
/* --- Header & Navigation --- */
header {
  background-color: var(--piri-reis-blue); /* #002C77 */
  padding: 10px 0 0;
  color: var(--text-light);
  margin-bottom: 40px;
}
main {
    flex: 1;
}
/* Bootstrap Navbar Özelleştirme */
.navbar-nav .nav-link {
    color: white !important;
    padding: 15px 20px;
    font-weight: 500;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Mobilde menü açılınca arka plan */
@media (max-width: 991px) {
    .navbar-collapse {
        background-color: #002C77;
        margin-top: 10px;
        border-radius: 6px;
    }
}

/* Logo ve İki Satırlık Başlık Bölümü */
.header-top {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}
.logo-area {
  height: 100px;
  display: flex;
  align-items: center;
}
.logo-img {
  height: 100%;
  width: auto;
}
.title-group {
  color: var(--text-light);
  margin-left: 25px;
}
.department-title {
  font-size: 1.2em;
  font-weight: normal;
  margin: 0 0 5px 0;
  opacity: 0.9;
}
.conference-title {
  font-size: 1.6em;
  font-weight: bold;
  margin: 0;
}

nav {
  background-color: var(--piri-reis-blue);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  position: sticky;
  top: 0;
  z-index: 1000;
}
nav ul li a {
  color: var(--text-light);
  text-decoration: none;
  padding: 15px 20px;
  display: block;
  font-weight: 500;
  font-size: 1rem;
  transition: background-color 0.3s;
}
nav ul li a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

h1,
h2,
h3 {
  color: var(--piri-reis-blue); /* #002C77 */
}
.hero {
  background-color: var(--background-light);
  padding: 40px 20px;
  text-align: center;
  margin-bottom: 20px;
  border-radius: 8px;
  border-left: 5px solid var(--piri-reis-blue); /* #002C77 */
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}
th,
td {
  padding: 12px;
  border: 1px solid #ddd;
  text-align: left;
}
th {
  background-color: var(--piri-reis-blue); /* #002C77 */
  color: white;
}
/* FOOTER - ARKA PLAN #002C77 */
footer {
  text-align: center;
  padding: 20px;
  background-color: #002c77; /* Doğrudan Hex Kodu */
  color: white;
  margin-top: 60px;
}

/* Committees Specific Styles */
.speaker-card {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
  padding: 15px;
  border: 1px solid #ddd;
  border-left: 3px solid var(--piri-reis-blue);
  align-items: center;
  background-color: var(--background-light);
  border-radius: 5px;
}
.speaker-image {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 50%; /* Yuvarlak resim */
  flex-shrink: 0;
  border: 3px solid var(--piri-reis-blue);
}

/* Contact Specific Styles */
.contact-info div {
  margin-bottom: 15px;
  padding: 10px;
  border-left: 3px solid var(--piri-reis-blue);
  background-color: var(--background-light);
}
.contact-info strong {
  display: inline-block;
  width: 80px;
}
.map-section {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid #ddd;
}
.map-placeholder {
  width: 100%;
  height: 400px;
  background-color: #e9ecef;
  text-align: center;
  line-height: 400px;
  margin-top: 15px;
  border: 1px dashed #ccc;
}

/* --- Akordeon Stilleri --- */
.accordion-item {
  border: 1px solid var(--piri-reis-blue);
  margin-bottom: 10px;
  border-radius: 5px;
  overflow: hidden;
}
.accordion-header {
  margin: 0;
}
.Header__Button {
  width: 100%;
  padding: 15px 20px;
  text-align: left;
  background-color: var(--piri-reis-blue);
  color: white;
  font-size: 1em; /* KÜÇÜLTÜLMÜŞ FONT BOYUTU */
  font-weight: bold;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.Header__Button:hover {
  background-color: var(--accent-dark);
}
.Header__Button::after {
  content: "+";
  font-size: 1.5em;
  transition: transform 0.3s ease;
}
.Header__Button.expanded::after {
  content: "-";
  transform: rotate(0deg);
}
.Collapse__Body {
  padding: 15px 20px;
  background-color: var(--background-light);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}
.Collapse__Body p {
  margin-bottom: 5px;
  margin-top: 0;
}
.Collapse__Body b {
  color: var(--piri-reis-blue);
}
.Item__Collapse {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}
.Item__Collapse.collapse.show {
  max-height: 500px;
}

/* index.html */

/* Poster Area */
.poster-section {
  text-align: center;
  margin-bottom: 40px;
}

.poster-img {
  max-width: 80%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  border-left: 6px solid #002c77;
}

/* Submit Button */
.btn-area {
  text-align: center;
  margin: 30px 0;
}

.btn-submit {
  background-color: var(--piri-reis-blue);
  color: white;
  padding: 15px 40px;
  text-decoration: none;
  border-radius: 5px;
  font-size: 1.2rem;
  font-weight: bold;
  display: inline-block;
  transition: transform 0.2s;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

h2 {
  color: var(--piri-reis-blue);
  margin-top: 30px;
}
.date-box {
  background-color: rgba(233, 236, 239, 0.85);
  padding: 15px;
  border-radius: 5px;
  margin-top: 15px;
  display: inline-block;
}
/* --- SPONSORS SECTION --- */
.sponsors-section {
  margin-top: 20px;
  /* text-align: center;  <-- Bu satırı sildik veya sola çektik */
  border-top: 1px solid #eee;
  padding-top: 20px;
}

/* Logoların hala ortada kalmasını istiyorsanız bu bloğu ekleyin */
.sponsor-row {
  display: flex;
  justify-content: center; /* Logolar ortada kalmaya devam eder */
  align-items: center;
  gap: 40px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.sponsor-img {
  max-height: 130px; /* Logoların yüksekliğini dengeler */
  width: auto;
  transition: opacity 0.3s;
}

.sponsor-img:hover {
  opacity: 0.8;
}

/* Proceedings Specific Styles */
.download-box {
  margin-top: 20px;
  padding: 20px;
  background-color: var(--background-light);
  border-left: 5px solid var(--piri-reis-blue);
  border-radius: 5px;
}
.download-box a {
  text-decoration: none;
  color: var(--piri-reis-blue);
  font-weight: bold;
  display: inline-block;
  margin-top: 10px;
}

/* Registration  */
.submission-list li {
  margin-bottom: 10px;
}
.general-registration-info-list li {
  margin-bottom: 10px;
  line-height: 1.5;
}
.abstract-requirements {
  border: 1px solid #ddd;
  padding: 15px;
  margin-top: 15px;
  background-color: var(--background-light);
  border-radius: 5px;
}
.download-button {
  display: inline-block;
  margin-top: 15px;
  padding: 10px 20px;
  background-color: var(--piri-reis-blue);
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
.download-button:hover {
  background-color: #002244;
}

/* PRU Accordion */
.pru-accordion .accordion-item {
    border: none;
    margin-bottom: 15px;
}

.pru-accordion .accordion-button {
    background-color: #002C77;
    color: #fff;
    font-size: 1.4rem;
    font-weight: 700;
    padding: 22px 24px;
    border-radius: 8px;
}

/* Hover */
.pru-accordion .accordion-button:hover {
    background-color: #001f55;
}

/* Varsayılan Bootstrap ok ikonunu kaldır */
.pru-accordion .accordion-button::after {
    display: none;
}

/* Sağdaki + / − ikon */
.pru-accordion .accordion-button::before {
    content: "+";
    font-size: 2rem;
    font-weight: 700;
    position: absolute;
    right: 24px;
}

/* Açıkken + → − */
.pru-accordion .accordion-button:not(.collapsed)::before {
    content: "−";
}

/* Açık durum rengi */
.pru-accordion .accordion-button:not(.collapsed) {
    background-color: #002C77;
    box-shadow: none;
}

/* Accordion body */
.pru-accordion .accordion-body {
    background-color: #f8f9fa;
    border-radius: 0 0 8px 8px;
    padding: 20px 24px;
    font-size: 1rem;
}


@media only screen and (max-device-width : 720px) {
    nav {
        background-color: var(--piri-reis-blue);
        border-top: 1px solid rgba(255, 255, 255, 0.2);
        position: sticky;
        top: 0;
        z-index: 1000;
    }
    nav ul li a {
        color: var(--text-light);
        text-decoration: none;
        padding: 15px 20px;
        display: block;
        font-weight: 500;
        font-size: 1rem;
        transition: background-color 0.3s;
    }
    .logo-area {
        height: 64px;
        display: flex;
        align-items: center;
    }
    .department-title {
        font-size: 1em;
    }
    .conference-title {
        font-size: 1.2em;
    }
    .poster-img {
        max-width: 100%;
    }
    .sponsor-img {
      max-height: 68px !important;
    }
}