/* ============================================================
   ICCK WEBSITE — STYLESHEET
   ============================================================
   HOW TO RE-THEME THE SITE:
   Change the values inside :root below and the whole site updates.
   You don't need to touch the rest of the file for basic edits.
============================================================ */

:root {
  /* ---- Colours ---- */
  --color-primary: #1d4b9b;      /* main brand colour (buttons, headings) 1f4e8c*/
  --color-primary-dark: #15387C;  /* darker shade for hover states 16375f*/
  --color-accent: #e8a33d;        /* accent colour (highlights, eyebrows) */
  --color-bg: #ffffff;            /* page background */
  --color-bg-alt: #f4f6f9;        /* background for alternating sections */
  --color-text: #2b2f36;          /* body text */
  --color-text-light: #6b7280;    /* muted text (captions, subtitles) */
  --color-border: #e3e7ec;        /* table borders */

  /* ---- Typography ---- */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-heading: var(--font-body);

  /* ---- Layout ---- */
  --container-max: 1100px;        /* max width of the content column */
  --radius: 8px;                  /* corner rounding for cards/buttons */
}

/* ------------------------------------------------------------
   RESET — removes browser default spacing so we control it all.
------------------------------------------------------------ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box; /* padding is inside the element width */
}

html {
  scroll-behavior: smooth; /* smooth scrolling when clicking nav links */
  /* scroll-padding stops the fixed header covering section titles */
  scroll-padding-top: 90px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
}

/* ------------------------------------------------------------
   PAGE VISIBILITY
   Only one <section class="page"> is visible at a time.
   js/main.js toggles the ".active" class when you click a nav item.
------------------------------------------------------------ */
main > .page {
  display: none;
}

main > .page.active {
  display: block;
}

/* ------------------------------------------------------------
   LAYOUT HELPERS
------------------------------------------------------------ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;          /* centre the column */
  padding: 0 24px;         /* side breathing room on small screens */
}

/* A generic content section */
.section {
  padding: 72px 0;
}

/* Alternate background for visual rhythm (used on even sections) */
.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 2rem;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.subsection-title {
  font-size: 1.25rem;
  margin: 32px 0 12px;
  color: var(--color-primary-dark);
}

.section p {
  margin-bottom: 16px;
  max-width: 75ch; /* keep lines a comfortable reading length */
}

/* ------------------------------------------------------------
   HEADER / NAVIGATION
------------------------------------------------------------ */
.site-header {
  position: sticky;          /* stays pinned to the top */
  top: 0;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Brand / logo area */
.brand {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary);
}

.brand-edition {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* The nav links */
.site-nav {
  display: flex;
  width: 100%;
  gap: 22px;
  justify-content: space-evenly;
  align-items: center;
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent; /* underline appears on hover */
  transition: color 0.15s, border-color 0.15s;
}

.site-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* The nav banner */
.site-header {
  position: static;
}

.site-banner img {
  display: block;
  width: 100%;
  height: auto;
}

/* Highlight the nav link of the section currently shown */
.site-nav a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* Hamburger button — hidden on desktop, shown on mobile */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
}



/* ------------------------------------------------------------
   HERO
------------------------------------------------------------ */
.hero {
  /* Gradient background — change the two hex values to re-colour it */
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  text-align: center;
  padding: 120px 0;
}

.hero-eyebrow {
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 3rem;
  margin-bottom: 16px;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.full-image {
  display: block;
  width: 100%;
  height: auto;
  margin: 24px 0;
}

/* ------------------------------------------------------------
   BUTTONS
------------------------------------------------------------ */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s, transform 0.15s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--color-accent);
  color: #1a1a1a;
}

.btn-primary:hover {
  background: #d18f2c; /* darker accent — adjust if you change --color-accent */
}

.btn-outline {
  border: 2px solid #fff;
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* ------------------------------------------------------------
   TABLES (important dates, program, registration fees)
------------------------------------------------------------ */
.table-wrap {
  overflow-x: auto;   /* lets wide tables scroll on small screens */
  margin: 24px 0;
}

.dates-table {
  width: 100%;
  border-collapse: collapse;
}

.dates-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.dates-table tr:last-child td {
  border-bottom: none;
}

.dates-table td:first-child {
  font-weight: 600;
  color: var(--color-primary-dark);
  white-space: nowrap;
}
/* Larghezze delle colonne del programma */

.program-table {
  width: 100%;
  border-collapse: collapse;
}

.program-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.program-table td:first-child {
  width: 20%;
  white-space: normal;
}

.program-table td:nth-child(2) {
  width: 35%;
}

.program-table td:nth-child(3) {
  width: 10%;
}

.program-table td:nth-child(4) {
  width: 35%;
}
/* ------------------------------------------------------------
   SUBMISSION STEPS (call for papers)
------------------------------------------------------------ */
.submission-content {
  margin: 6px 0 12px;
  padding-left: 20px;
  max-width: 75ch;
}

.submission-content li {
  margin-bottom: 4px;
}

.submission-content a {
  color: var(--color-primary);
  font-weight: 600;
}

.submission-content em {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ------------------------------------------------------------
   TOPICS LIST (call for papers)
------------------------------------------------------------ */
.topics-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin: 16px 0 24px;
}

.topics-list li {
  background: var(--color-bg-alt);
  padding: 12px 16px;
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
}

/* ------------------------------------------------------------
   KEYNOTE SPEAKERS GRID
------------------------------------------------------------ */
.speaker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.speaker-card {
  text-align: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow 0.15s;
}

.speaker-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

/* Placeholder box where a photo goes. Replace [Photo] with <img> later. */
.speaker-photo img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 0.85rem;
}

.speaker-name {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
}

.speaker-affil {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ------------------------------------------------------------
   COMMITTEE LIST
------------------------------------------------------------ */
.committee-list {
  list-style: none;
  margin: 12px 0 24px;
}

.committee-list li {
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
}

.committee-list li:last-child {
  border-bottom: none;
}

.committee-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.committee-card {
  text-align: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow 0.15s;
}

.committee-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

/* Placeholder box where a photo goes. Replace [Photo] with <img> later. */
.committee-photo img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 0.85rem;
}

.committee-name {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
}

.committee-affil {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ------------------------------------------------------------
   VENUE
------------------------------------------------------------ */
.venue-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 500px);
  align-items: start;
  gap: 24px;
}

.venue-text {
  flex: 1;
  min-width: 0;
  max-width: 60ch;
  text-align: justify;
}

.venue-image {
  width: 500px;
  max-width: 100%;
  height: auto;
  display: block;
}

/* On mobile image goes below the text */
@media (max-width: 600px) {
  .venue-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ------------------------------------------------------------
   FOOTER
------------------------------------------------------------ */
.site-footer {
  background: var(--color-primary-dark);
  color: #fff;
  padding: 32px 0;
  text-align: center;
  font-size: 0.9rem;
}

/* ------------------------------------------------------------
   BACK-TO-TOP BUTTON
------------------------------------------------------------ */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  /* hidden by default; JS adds the .visible class when you scroll */
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ------------------------------------------------------------
   RESPONSIVE — mobile styles
------------------------------------------------------------ */
@media (max-width: 768px) {
  /* Stack the header: brand left, hamburger right */
  .nav-toggle {
    display: flex;
  }

  /* Hide the nav by default; slide it down when .open is added */
  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    display: none;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 14px 24px;
    border-bottom: 1px solid var(--color-border);
  }

  .hero-title {
    font-size: 2rem;
  }

  .section {
    padding: 48px 0;
  }
}

.home-about {
  margin-top: 48px;
  padding: 24px;
  background-color: transparent;
  color: #fff;
  text-align: left;
}

.home-about .section-title {
  color: #e8a33d;
  text-align: left;
}

.home-about p {
  color: #fff;
  text-align: justify;
  line-height: 1.8;
}
.topics-title {
  margin-top: 40px;
}

body:has(#home.active) #headerBanner {
  display: none !important;
}

#home .home-banner {
  position: relative;
  width: calc(100% - 48px);
  max-width: 100%;
  margin: 0 24px 32px;
  box-sizing: border-box;
  isolation: isolate;
}

#home .home-banner > img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* Sfuma i bordi dell’immagine verso il blu dello sfondo */
#home .home-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  box-shadow: inset 0 0 28px 14px var(--banner-blue);
}

/* Pulsanti sovrapposti, centrati in basso */
#home .home-banner .hero-actions {
  position: absolute;
  bottom: 10px;
  left: 0;
  right: 0;
  z-index: 2;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 200px;
  margin: 0;
  padding: 0 16px;
}

.about-image {
  position: relative;
}

#home .about-image > img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0;
  position: relative;
  z-index: 0;
}

/* Sfuma i bordi dell’immagine verso il blu dello sfondo */
#home .about-image::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  box-shadow: inset 0 0 28px 14px var(--banner-blue);
}

#home {
  --banner-blue: #1d4b9b;
}
/* Wing Tsang Award */
.award-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 295px;
  gap: 40px;
  align-items: center;
}
.award-intro .subsection-title { margin-top: 0; }
.award-medal { text-align: center; }
.award-medal img { display: block; width: 100%; max-width: 295px; height: auto; margin: 0 auto 12px; }
.award-medal figcaption { font-size: 0.85rem; color: var(--color-text-light); }
.award-deadline { padding: 16px 20px; background: var(--color-bg-alt); border-left: 4px solid var(--color-accent); }
#wing-tsang-award a { color: var(--color-primary); overflow-wrap: anywhere; }
@media (max-width: 768px) {
  .award-intro { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .award-medal img { max-width: 240px; }
}

/* Responsive layout: keep navigation and actions in normal flow. */
.header-inner { height: auto; min-height: 72px; padding-top: 12px; padding-bottom: 12px; }
.site-nav { column-gap: 20px; row-gap: 8px; }
.site-nav a { white-space: nowrap; }
.committee-photo img, .speaker-photo img { object-fit: cover; }
.committee-card, .speaker-card { min-width: 0; overflow-wrap: anywhere; }
.section a { overflow-wrap: anywhere; }

@media (max-width: 1024px) {
  #home .home-banner .hero-actions { gap: 24px; }
  .venue-layout { grid-template-columns: minmax(0, 1fr); }
  .venue-image { width: 100%; max-width: 600px; }
  .venue-text { width: 100%; max-width: none; }
}

@media (max-width: 768px) {
  .container { padding-left: 20px; padding-right: 20px; }
  .header-inner { flex-wrap: wrap; justify-content: flex-end; min-height: 64px; }
  .nav-toggle { min-width: 44px; min-height: 44px; align-items: center; justify-content: center; }
  .site-nav { position: static; flex-basis: 100%; width: 100%; padding-top: 8px; border-bottom: 0; }
  .site-nav a { display: block; width: 100%; text-align: left; padding: 12px 4px; }
  .hero { padding: 24px 0 40px; }
  #home .home-banner { width: 100%; margin: 0 0 28px; }
  #home .home-banner::after { display: none; }
  #home .home-banner .hero-actions {
    position: static; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: stretch; gap: 12px; margin-top: 20px; padding: 0;
  }
  .btn { text-align: center; max-width: 100%; min-height: 48px; }
  .home-about { margin-top: 28px; padding: 0; }
  .home-about p, .venue-text { text-align: left; }
  .home-about p { line-height: 1.7; }
  .section-title { font-size: 1.75rem; line-height: 1.25; overflow-wrap: anywhere; }
  .section { padding: 36px 0; }
  .section ul, .section ol { padding-left: 20px; }
  .committee-grid, .speaker-grid { grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); gap: 16px; }
  .topics-list { grid-template-columns: minmax(0, 1fr); }
  .dates-table td { padding: 12px 8px; vertical-align: top; }
  .dates-table td:first-child { white-space: normal; }
  .program-table { min-width: 560px; }
  .table-wrap { max-width: 100%; -webkit-overflow-scrolling: touch; }
  .back-to-top { right: 16px; bottom: 16px; }
}

@media (min-width: 361px) and (max-width: 768px) {
  #home .hero-actions .btn { display: flex; align-items: center; justify-content: center; padding: 12px 8px; font-size: 0.9rem; }
}
@media (max-width: 360px) {
  #home .home-banner .hero-actions { grid-template-columns: minmax(0, 1fr); }
}