/* ===== Mentor-style theme for TbiSS 2026 ===== */

:root {
  --background-color: #ffffff;
  --default-color: #444444;
  --heading-color: #37423b;
  --accent-color: #000080;
  --surface-color: #ffffff;
  --contrast-color: #ffffff;
  --default-font: "Open Sans", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --heading-font: "Raleway", sans-serif;
  --nav-font: "Poppins", sans-serif;
  --nav-color: #272828;
  --nav-hover-color: #000080;
}

/* ---- General ---- */
*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--default-font);
  color: var(--default-color);
  background-color: var(--background-color);
  scroll-behavior: smooth;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.3s;
}
a:hover { color: #0000b3; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  color: var(--heading-color);
}

sup { font-size: 0.55em; }

/* ---- Header / Navbar ---- */
.header {
  background-color: rgba(255, 255, 255, 0.97);
  padding: 14px 0;
  transition: box-shadow 0.4s;
  z-index: 997;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
}
.header.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.header .logo h1 {
  font-size: 1.45rem;
  font-weight: 800;
  font-family: var(--heading-font);
  color: var(--accent-color);
  margin: 0;
  letter-spacing: 0.5px;
}

.navmenu ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 2px;
}

.navmenu a {
  font-family: var(--nav-font);
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--nav-color);
  padding: 7px 13px;
  display: block;
  transition: all 0.25s;
  border-radius: 4px;
}
.navmenu a:hover,
.navmenu a.active {
  color: var(--nav-hover-color);
  background-color: rgba(0, 0, 128, 0.07);
}

.mobile-nav-toggle {
  display: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--nav-color);
  line-height: 1;
}

@media (max-width: 1199px) {
  .mobile-nav-toggle { display: block; }
  .navmenu ul {
    display: none;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    top: 66px;
    right: 16px;
    background: white;
    padding: 12px;
    border-radius: 10px;
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.14);
    min-width: 210px;
    gap: 2px;
  }
  .navmenu.mobile-nav-active ul { display: flex; }
}

/* ---- Hero ---- */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 0 60px;
  overflow: hidden;
  color: white;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
  z-index: 0;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(150deg, rgba(0, 0, 60, 0.55) 0%, rgba(0, 0, 120, 0.40) 100%);
  z-index: 1;
}

.hero .container { position: relative; z-index: 2; }

.hero .edition-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 10px 36px;
  border-radius: 50px;
  font-family: var(--heading-font);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 22px;
  color: rgba(255, 255, 255, 0.95);
}

.hero h2 {
  font-size: clamp(1.75rem, 4.5vw, 3.1rem);
  font-weight: 800;
  color: white;
  line-height: 1.2;
  margin-bottom: 18px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.hero .tagline {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.82);
  font-style: italic;
  margin-bottom: 28px;
}

.hero .event-info {
  font-family: var(--nav-font);
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
}
.hero .event-info i { margin-right: 6px; opacity: 0.75; }
.hero .event-info .separator { opacity: 0.4; }

.btn-register {
  display: inline-block;
  background-color: var(--accent-color);
  color: white;
  padding: 14px 42px;
  border-radius: 50px;
  font-family: var(--nav-font);
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid var(--accent-color);
  transition: all 0.3s;
}
.btn-register:hover {
  background-color: transparent;
  color: white;
  border-color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.25);
}

/* ---- Sections ---- */
section { padding: 80px 0; }
.light-background { background-color: #f8f9fa; }
.dark-background { background-color: #060606; }

.section-title { margin-bottom: 48px; }

.section-title span {
  font-family: var(--nav-font);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--accent-color);
  display: block;
  margin-bottom: 8px;
}

.section-title h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
  position: relative;
  padding-bottom: 18px;
  margin-bottom: 0;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background-color: var(--accent-color);
  border-radius: 2px;
}

.section-title.text-center h2::after {
  left: 50%;
  transform: translateX(-50%);
}

.section-subtitle {
  color: #777;
  font-size: 1rem;
  margin-top: 14px;
  margin-bottom: 0;
}

/* ---- About: info cards ---- */
.about p { line-height: 1.8; margin-bottom: 14px; }

.info-card {
  background: white;
  border: 1px solid #e8eaec;
  border-radius: 10px;
  padding: 26px 18px;
  text-align: center;
  height: 100%;
  transition: all 0.3s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.info-card:hover {
  box-shadow: 0 6px 24px rgba(0, 0, 128, 0.1);
  transform: translateY(-3px);
  border-color: rgba(0, 0, 128, 0.18);
}
.info-card i {
  font-size: 2rem;
  color: var(--accent-color);
  margin-bottom: 12px;
  display: block;
}
.info-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.info-card p {
  font-size: 0.875rem;
  color: #666;
  margin: 0;
  line-height: 1.55;
}

/* ---- Speakers ---- */
.speaker-card {
  background: white;
  border-radius: 12px;
  padding: 32px 22px;
  text-align: center;
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.06);
  border: 1px solid #eee;
  height: 100%;
  transition: all 0.3s;
}
.speaker-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px rgba(0, 0, 128, 0.13);
  border-color: rgba(0, 0, 128, 0.14);
}

.speaker-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.7rem;
  font-weight: 700;
  color: white;
  font-family: var(--heading-font);
  letter-spacing: 1px;
  overflow: hidden;
  flex-shrink: 0;
}

.speaker-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.speaker-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.speaker-card .affiliation {
  font-size: 0.85rem;
  color: #777;
  font-style: italic;
  margin: 0;
}
.speaker-details-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.speaker-details-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 10px;
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}
@media (max-width: 575px) {
  .speaker-details-list li {
    flex-direction: column;
    gap: 2px;
  }
  .sd-affiliation::before,
  .sd-areas::before {
    display: none;
  }
  .sd-affiliation,
  .sd-areas {
    white-space: normal;
  }
}
.speaker-details-list li:last-child {
  border-bottom: none;
}
.sd-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--heading-color);
  white-space: nowrap;
}
.sd-name a {
  color: var(--heading-color);
  text-decoration: none;
}
.sd-name a:hover {
  color: var(--accent-color);
  text-decoration: underline;
}
.sd-affiliation {
  font-size: 0.85rem;
  color: #777;
  font-style: italic;
  white-space: nowrap;
}
.sd-affiliation::before {
  content: "—";
  margin-right: 6px;
}
.sd-areas {
  font-size: 0.85rem;
  color: #999;
}
.sd-areas::before {
  content: "—";
  margin: 0 6px;
}

/* ---- Topics ---- */
.topic-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 18px;
  background: white;
  border-radius: 10px;
  border: 1px solid #e8eaec;
  height: 100%;
  transition: all 0.3s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.topic-item:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 128, 0.1);
  border-color: rgba(0, 0, 128, 0.16);
  transform: translateY(-2px);
}
.topic-item i {
  font-size: 1.6rem;
  color: var(--accent-color);
  flex-shrink: 0;
}
.topic-item h5 {
  font-size: 0.92rem;
  font-weight: 600;
  margin: 0;
  color: var(--heading-color);
  line-height: 1.3;
}

/* ---- Schedule ---- */
.schedule-table thead th {
  background-color: var(--accent-color);
  color: white;
  font-family: var(--nav-font);
  font-size: 0.82rem;
  font-weight: 500;
  text-align: center;
  padding: 12px 10px;
  border-color: rgba(255, 255, 255, 0.2);
}
.schedule-table td {
  text-align: center;
  vertical-align: middle;
  font-size: 0.875rem;
  color: #888;
  font-style: italic;
  padding: 12px 10px;
}
.schedule-table .day-col {
  font-weight: 700;
  color: var(--heading-color);
  font-style: normal;
  font-family: var(--nav-font);
  font-size: 0.82rem;
}

/* ---- Registration ---- */
.registration-box {
  background: linear-gradient(135deg, #000060 0%, #0000a0 100%);
  border-radius: 18px;
  padding: 54px 44px;
  color: white;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 128, 0.25);
}
.registration-box .section-title span { color: rgba(255, 255, 255, 0.65); }
.registration-box .section-title h2 { color: white; }
.registration-box .section-title h2::after { background-color: rgba(255,255,255,0.5); }
.registration-box > p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 1rem;
  margin-bottom: 22px;
}

.who-can-apply {
  list-style: none;
  padding: 0;
  margin: 0 0 36px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}
.who-can-apply li {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-family: var(--nav-font);
  font-weight: 500;
  color: white;
}

.btn-register-white {
  display: inline-block;
  background-color: white;
  color: var(--accent-color);
  padding: 14px 46px;
  border-radius: 50px;
  font-family: var(--nav-font);
  font-weight: 700;
  font-size: 1rem;
  border: 2px solid white;
  transition: all 0.3s;
}
.btn-register-white:hover {
  background-color: transparent;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.25);
}

/* ---- Venue ---- */
.venue-card {
  background: white;
  border-radius: 14px;
  border: 1px solid #e8eaec;
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.05);
}
.venue-card .venue-icon {
  font-size: 3.2rem;
  color: var(--accent-color);
  margin-bottom: 16px;
  display: block;
}
.venue-card h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.venue-card p { color: #666; max-width: 520px; margin: 0 auto; line-height: 1.7; }

.venue-notice {
  display: inline-block;
  margin-top: 24px;
  background: rgba(0, 0, 128, 0.07);
  border: 1px solid rgba(0, 0, 128, 0.18);
  color: var(--heading-color);
  border-radius: 8px;
  padding: 10px 22px;
  font-size: 0.875rem;
}

/* ---- Organization ---- */
.org-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 22px;
  background: white;
  border-radius: 12px;
  border: 1px solid #e8eaec;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  transition: all 0.3s;
  height: 160px;
  text-align: center;
  overflow: hidden;
}
.org-logo:hover {
  box-shadow: 0 6px 26px rgba(0, 0, 128, 0.1);
  transform: translateY(-3px);
  border-color: rgba(0, 0, 128, 0.18);
}
.org-logo .org-abbr {
  font-family: var(--heading-font);
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--accent-color);
  line-height: 1.1;
}
.org-logo .org-full {
  font-size: 0.95rem;
  color: #888;
  margin-top: 6px;
  font-family: var(--nav-font);
  line-height: 1.3;
}
.org-img {
  width: 120px;
  height: 70px;
  object-fit: contain;
  margin-bottom: 10px;
  display: block;
}

/* ---- Logo sun ---- */
.logo-sun {
  width: 28px;
  height: 28px;
  margin-right: 8px;
  flex-shrink: 0;
}
@media (max-width: 575px) {
  .logo-sun { display: none; }
}

/* ---- Registration note ---- */
.registration-note {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.875rem;
  margin-top: -14px;
  margin-bottom: 32px;
}
.registration-note strong { color: white; }

/* ---- Committee ---- */
.committee-box {
  background: #f8f9fa;
  border: 1px solid #e8eaec;
  border-radius: 12px;
  padding: 28px 32px;
  text-align: center;
}
.committee-title {
  font-family: var(--nav-font);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-color);
  margin-bottom: 18px;
}
.committee-names {
  font-size: 0.9rem;
  color: var(--default-color);
  line-height: 1.9;
  margin: 0;
}

/* ---- History section ---- */
.history-stat {
  background: white;
  border: 1px solid #e8eaec;
  border-radius: 12px;
  padding: 24px 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.history-stat-num {
  font-family: var(--heading-font);
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--accent-color);
  line-height: 1;
}
.history-stat-label {
  font-family: var(--nav-font);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #888;
  margin-top: 6px;
}

.history-intro {
  font-size: 1rem;
  line-height: 1.8;
  color: #555;
  text-align: center;
}

.edition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 10px;
}
.edition-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: white;
  border: 1px solid #e8eaec;
  border-radius: 10px;
  padding: 14px 6px;
  text-decoration: none;
  transition: all 0.25s;
  text-align: center;
  gap: 2px;
}
.edition-item:hover {
  border-color: var(--accent-color);
  box-shadow: 0 4px 16px rgba(0, 0, 128, 0.12);
  transform: translateY(-3px);
  text-decoration: none;
}
.edition-highlight {
  border-color: rgba(0, 0, 128, 0.25);
  background: rgba(0, 0, 128, 0.04);
}
.edition-year {
  font-family: var(--heading-font);
  font-weight: 800;
  font-size: 1rem;
  color: var(--accent-color);
  line-height: 1.1;
}
.edition-num {
  font-size: 0.68rem;
  font-family: var(--nav-font);
  color: #bbb;
}
.edition-loc {
  font-size: 0.7rem;
  font-family: var(--nav-font);
  color: #888;
}

/* ---- Founder cards ---- */
.founder-card {
  background: white;
  border-radius: 12px;
  padding: 26px 16px;
  border: 1px solid #e8eaec;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: all 0.3s;
  height: 100%;
}
.founder-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(0, 0, 128, 0.12);
}
.founder-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-color);
}
.founder-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}
.founder-initials {
  color: white;
  font-family: var(--heading-font);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 1px;
}
.founder-card h5 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--heading-color);
}
.founder-card p {
  font-size: 0.75rem;
  color: #888;
  font-style: italic;
  margin: 0;
  line-height: 1.4;
}

/* ---- Footer ---- */
.footer {
  background-color: #f2f3f4;
  border-top: 1px solid #e0e0e0;
  padding: 28px 0;
  text-align: center;
}
.footer p {
  margin: 0;
  font-size: 0.875rem;
  color: #777;
}
.footer a { color: var(--accent-color); }
.footer a:hover { color: #0000b3; }

/* ---- Scroll to top ---- */
.scroll-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 44px;
  height: 44px;
  background-color: var(--accent-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  z-index: 999;
  cursor: pointer;
  border: none;
  box-shadow: 0 4px 16px rgba(0, 0, 128, 0.3);
}
.scroll-top.active {
  opacity: 1;
  pointer-events: auto;
}
.scroll-top:hover {
  background-color: #0000a0;
  transform: translateY(-2px);
}

/* ---- Impressum ---- */
.impressum {
  background-color: #ebebec;
  border-top: 1px solid #d8d8d8;
  padding: 16px 0 20px;
  text-align: center;
}
.impressum p {
  margin: 0 auto;
  max-width: 860px;
  font-size: 0.8rem;
  color: #777;
  font-family: Georgia, "Times New Roman", Times, serif;
  font-style: italic;
  line-height: 1.65;
}