/*
 * Stylesheet for the AIDA (AI‑aided Design Automation) lab website.
 */

/* Colour palette */
:root {
  --primary: #1a2b49;       /* header/nav bg */
  --secondary: #3d5a80;     /* accents */
  --accent: #ee6c4d;        /* accent (borders/hover) */
  --light-bg: #f5f8fc;      /* page bg */
  --text-colour: #333333;   /* body text */
  --heading-colour: #1a2b49;
  --publication: #40667c;   /* [Jx]/[Cx] labels */
}

/* Global reset */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  color: var(--text-colour);
  background-color: var(--light-bg);
  scroll-behavior: smooth;
}

/* Header & nav */
header {
  background-color: var(--primary);
  color: #fff;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 1000;
}

header h1 { font-size: 1.6rem; font-weight: 600; }
h1 a { color: inherit; text-decoration: none; }

nav { display: flex; align-items: center; flex-wrap: wrap; }
nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 1rem;
  position: relative;
  padding: 0.25rem 0;
}
nav a.current { font-weight: 600; border-bottom: 2px solid var(--accent); }
nav a::after {
  content: '';
  display: block;
  height: 2px;
  background: var(--accent);
  width: 0;
  position: absolute;
  left: 0;
  bottom: -2px;
  transition: width 0.3s;
}
nav a:hover::after { width: 100%; }

/* Ensure dropdown can escape the header line */
header, #nav-menu { position: relative; z-index: 1000; }
#nav-menu { overflow: visible; }

/* --- People dropdown (shared) --- */
#nav-menu .has-submenu { position: relative; display: inline-block; }
#nav-menu .submenu-parent {
  background: none; border: 0; color: #fff; cursor: pointer;
  font: inherit; padding: 0; margin-left: 1.5rem;
}
#nav-menu .submenu-parent::after { content: " ▾"; opacity: .85; }

/* Dropdown panel (desktop default) */
#nav-menu .submenu {
  display: none;
  position: absolute;
  top: 100%; left: 0;
  min-width: 220px;
  background: #fff; color: #222;
  border: 1px solid rgba(0,0,0,.08);
  border-radius: .5rem;
  box-shadow: 0 10px 24px rgba(0,0,0,.12);
  padding: .4rem 0;
  z-index: 2000;
}
#nav-menu .submenu li { list-style: none; }
#nav-menu .submenu a {
  display: block;
  padding: .6rem .9rem;
  text-decoration: none; color: #222; white-space: nowrap;
}
#nav-menu .submenu a:hover { background: rgba(0,0,0,.06); }

/* Desktop: show submenu on hover/focus */
@media (min-width: 900px) {
  #nav-menu .has-submenu:hover > .submenu,
  #nav-menu .has-submenu:focus-within > .submenu { display: block; }
}

/* --- Mobile nav as drawer + accordion (≤ 899px) --- */
.menu-toggle { display: none; flex-direction: column; cursor: pointer; }
.menu-toggle span { height: 3px; width: 25px; background: #fff; margin: 4px 0; transition: .3s; }

@media (max-width: 899px) {
  .menu-toggle { display: flex; }

  /* Drawer */
  #nav-menu {
    display: none;
    position: fixed;
    inset: 0 0 auto 0;
    background: var(--primary);             /* match desktop blue */
    padding: 72px 16px 24px;
    max-height: 100svh;
    overflow-y: auto;
    box-shadow: 0 30px 60px rgba(0,0,0,.35);
  }
  #nav-menu.active { display: block; }

  /* Lock page scroll when open */
  body.nav-open { overflow: hidden; }

  /* Tap targets */
  #nav-menu a, #nav-menu .submenu-parent {
    display: block;
    padding: 14px 8px;
    font-size: 1.05rem;
    color: #fff;
    text-decoration: none;
  }

  /* Submenu as accordion */
  #nav-menu .has-submenu { display: block; }
  #nav-menu .submenu-parent {
    text-align: left; width: 100%;
  }
  #nav-menu .submenu-parent::after {
    content: "▾"; float: right; opacity: .8; transition: transform .2s ease;
  }
  #nav-menu .has-submenu.open .submenu-parent::after { transform: rotate(180deg); }

  #nav-menu .submenu {
    position: static;
    display: none;
    margin: 6px 0 10px 0;
    padding: 6px 0;
    background: #fff;                       /* white panel for consistency */
    color: #222;
    border-radius: 8px;
    box-shadow: 0 10px 24px rgba(0,0,0,.12);
  }
  #nav-menu .has-submenu.open > .submenu { display: block; }

  #nav-menu .submenu a {
    display: block;
    padding: 10px 12px;
    color: #222;
    background: transparent;
    text-decoration: none;
  }
  #nav-menu .submenu a:hover { background: rgba(0,0,0,.06); border-radius: 6px; }
}

/* Hero */
.hero {
  background: url('../images/hero.png') center/cover no-repeat;
  min-height: 60vh;
  display: flex; align-items: center; justify-content: center;
  color: #fff; text-align: center; padding: 2rem; position: relative;
}
.hero::before {
  content: ''; position: absolute; inset: 0; background: rgba(0,0,0,.4); z-index: 0;
}
.hero .hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero h2 { font-size: 2.4rem; margin-bottom: 1rem; font-weight: 700; color: #fff; text-shadow: 0 2px 4px rgba(0,0,0,.5); }
.hero p  { font-size: 1.2rem; color: #f8f8f8; text-shadow: 0 1px 3px rgba(0,0,0,.5); }

/* Container */
.container { max-width: 1100px; margin: 0 auto; padding: 2rem 1rem; }

/* Section headings */
section h2 {
  color: var(--heading-colour);
  margin-bottom: 0.75rem;
  font-size: 1.8rem;
  border-left: 4px solid var(--accent);
  padding-left: 0.6rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}
.card {
  background: #fff; border-radius: 8px; overflow: hidden;
  box-shadow: 0 4px 10px rgba(0,0,0,.05);
  transition: transform .3s; display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); }
.card img { width: 100%; height: 160px; object-fit: cover; }
.card .card-content { padding: 1rem; flex: 1; }
.card .card-content h3 { margin-bottom: .5rem; font-size: 1.3rem; color: var(--primary); }
.card .card-content p  { font-size: .95rem; line-height: 1.4; }

/* People page */
.profile {
  display: flex; flex-direction: column; align-items: center; text-align: center; margin-bottom: 2rem;
}
.profile img {
  width: 180px; height: 180px; border-radius: 50%; object-fit: cover; margin-bottom: 1rem; background: #e0e0e0;
}
.profile h3 { font-size: 1.4rem; color: var(--primary); margin-bottom: .5rem; }
.profile p  { font-size: .95rem; max-width: 600px; }

/* Publications table */
.pub-table { width: 100%; border-collapse: collapse; margin-top: 1rem; font-size: .9rem; }
.pub-table th, .pub-table td { padding: .75rem; border-bottom: 1px solid #ddd; }
.pub-table th { background: var(--secondary); color: #fff; text-align: left; }
.pub-table tr:nth-child(even) { background: #f9f9f9; }

/* Footer */
footer {
  background-color: var(--primary);
  color: #fff;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: .85rem;
  margin-top: 2rem;
}

/* Lists inside content */
.container ul { list-style-position: inside; padding-left: 1rem; margin-left: 0; }

/* Custom counters: Journal/Conference */
.journal-list { counter-reset: journal; list-style: none; padding-left: 2.5rem; }
.journal-list li {
  counter-increment: journal; position: relative; margin-bottom: .75rem; padding-left: 2rem; 
}
.journal-list li::before {
  content: "[J" counter(journal) "] ";
  position: absolute; left: -0.7rem; font-weight: bold; color: var(--publication);
}

.conference-list { counter-reset: conference; list-style: none; padding-left: 2.5rem; }
.conference-list li {
  counter-increment: conference; position: relative; margin-bottom: .75rem; padding-left: 2rem;
}
.conference-list li::before {
  content: "[C" counter(conference) "] ";
  position: absolute; left: -0.7rem; font-weight: bold; color: var(--publication);
}