/* =============================================================
   Shared: Top Bar + Bottom Nav + Mobile Drawer + Footer + Reset
   Used by all conference years
   ============================================================= */

/* ── CSS custom properties ── */
:root {
    --color-navy:       #002147;
    --color-navy-light: #003366;
    --color-teal:       #007B87;
    --color-teal-dark:  #005f69;
    --color-gold:       #C8A951;
    --color-white:      #ffffff;
    --color-off-white:  #f5f7fa;
    --color-text:       #1a1a2e;
    --color-text-muted: #555e6d;
    --card-shadow:      0 4px 20px rgba(0,33,71,.12);
    --card-shadow-hover:0 8px 32px rgba(0,33,71,.22);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --topbar-h: 56px;
    --bottomnav-h: 52px;
    --section-pad-v: 2rem;
    --container-max: 1200px;
    --trans-fast: 200ms ease;
    --trans-mid:  350ms cubic-bezier(.4,0,.2,1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-navy);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    font-size: 15px;
    line-height: 1.6;
}

a { color: var(--color-teal); text-decoration: none; }

/* ── Skip link ── */
.skip-link {
    position: absolute; top: -100px; left: 1rem;
    background: var(--color-teal); color: #fff; padding: .5rem 1rem;
    border-radius: 0 0 6px 6px; font-weight: 600; font-size: .85rem;
    z-index: 9999; text-decoration: none;
    transition: top var(--trans-fast);
}
.skip-link:focus {
    top: 0; outline: 2px solid var(--color-white); outline-offset: -4px;
}
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--color-teal); outline-offset: 3px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }
address { font-style: normal; }
ul { list-style: none; }

/* ═══════════════════════════════════════
   TOP BAR
═══════════════════════════════════════ */
.unnc-topbar {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: #fff;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 1.25rem;
    z-index: 900;
    box-shadow: 0 2px 12px rgba(0,0,0,.12);
    border-bottom: 1px solid rgba(0,0,0,.08);
}

.unnc-topbar-left { display: flex; align-items: center; gap: .875rem; flex-shrink: 0; }

.topbar-logo-link { display: flex; align-items: center; text-decoration: none; }
.topbar-logo-link:hover { opacity: .85; }

.unnc-topbar-logo { height: 32px; width: auto; object-fit: contain; }

.cedex-topbar-logo { height: 34px; width: auto; object-fit: contain; filter: brightness(1.08); }

.unnc-topbar-separator { width: 1px; height: 28px; background: rgba(0,0,0,.15); }

.unnc-topbar-right { display: flex; align-items: center; gap: .25rem; }

.unnc-topbar-link {
    color: var(--color-navy); font-size: .8rem; font-weight: 500;
    letter-spacing: .02em; padding: .35rem .65rem; border-radius: 4px;
    border: none; background: transparent; cursor: pointer; white-space: nowrap;
    transition: color var(--trans-fast), background var(--trans-fast);
    text-decoration: none; display: flex; align-items: center; gap: .3rem;
}
.unnc-topbar-link:hover { color: var(--color-navy); background: rgba(0,33,71,.08); text-decoration: none; }

/* Editions dropdown */
.unnc-topbar-editions { position: relative; }

.editions-dropdown {
    visibility: hidden; pointer-events: none;
    position: absolute; top: calc(100% + 8px); right: 0;
    background: var(--color-white); border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,.18); overflow: hidden; min-width: 130px;
    z-index: 1000; transform: translateY(-6px); opacity: 0;
    transition: opacity var(--trans-fast), transform var(--trans-fast), visibility 0s linear var(--trans-fast);
}
.editions-dropdown.open { visibility: visible; pointer-events: auto; transform: translateY(0); opacity: 1; transition: opacity var(--trans-fast), transform var(--trans-fast), visibility 0s linear 0s; }

.editions-item {
    display: block; padding: .65rem 1.1rem; color: var(--color-navy);
    font-size: .85rem; font-weight: 500; text-decoration: none;
    transition: background var(--trans-fast);
}
.editions-item:hover { background: var(--color-off-white); text-decoration: none; }

.editions-item--tba { color: var(--color-text-muted); cursor: default; font-style: italic; }
.editions-item--tba:hover { background: transparent; }

/* ── Mobile hamburger ── */
.mobile-menu-btn {
    display: none; flex-direction: column; justify-content: center; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 6px; border-radius: 4px;
}
.mobile-menu-btn span { display: block; width: 22px; height: 2px; background: var(--color-navy); border-radius: 2px; transition: transform var(--trans-fast), opacity var(--trans-fast), background var(--trans-fast); }
.mobile-menu-btn:hover span { background: var(--color-teal-dark); }
/* Hamburger → X when drawer is open */
.mobile-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.mobile-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ═══════════════════════════════════════
   MOBILE DRAWER
═══════════════════════════════════════ */
.mobile-overlay { visibility: hidden; opacity: 0; position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 950; transition: opacity var(--trans-mid), visibility 0s linear var(--trans-mid); }
.mobile-overlay.open { visibility: visible; opacity: 1; transition: opacity var(--trans-mid), visibility 0s linear 0s; }

.mobile-drawer {
    position: fixed; top: 0; right: 0; bottom: 0;
    width: min(280px, 85vw); background: var(--color-navy); z-index: 960;
    transform: translateX(100%); transition: transform var(--trans-mid);
    padding: calc(var(--topbar-h) + 1rem) 0 2rem; overflow-y: auto;
}
.mobile-drawer.open { transform: translateX(0); }

.mobile-drawer-link {
    display: block; color: rgba(255,255,255,.85); font-size: .95rem; font-weight: 500;
    padding: .8rem 1.5rem; text-decoration: none;
    border-left: 3px solid transparent;
    transition: color var(--trans-fast), border-color var(--trans-fast), background var(--trans-fast);
}
.mobile-drawer-link:hover { color: var(--color-white); border-color: var(--color-teal); background: rgba(255,255,255,.07); text-decoration: none; }
.mobile-drawer-ext { color: rgba(255,255,255,.55); font-size: .85rem; }

.mobile-drawer-sep { height: 1px; background: rgba(255,255,255,.12); margin: .75rem 1.5rem; }

/* ═══════════════════════════════════════
   BOTTOM FIXED NAV
═══════════════════════════════════════ */
.side-nav {
    position: fixed; bottom: 0; left: 0; right: 0;
    height: var(--bottomnav-h);
    display: flex; flex-direction: row; align-items: center; justify-content: center; gap: 0;
    z-index: 800;
    background: rgba(0,33,71,.92);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255,255,255,.12);
}

.nav-progress {
    font-size: .62rem; font-weight: 700; letter-spacing: .06em;
    color: rgba(255,255,255,.35);
    padding: 0 .65rem; flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

.nav-dot {
    display: flex; align-items: center; justify-content: center;
    flex: 1; max-width: 110px; height: 100%; width: auto;
    border-radius: 0; background: transparent; border: none;
    color: rgba(255,255,255,.55); font-size: .68rem; font-weight: 500;
    font-family: var(--font-sans); text-decoration: none;
    letter-spacing: .02em; white-space: nowrap;
    transition: color var(--trans-fast), background var(--trans-fast);
    position: relative; box-shadow: none;
}
.nav-dot::after {
    content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
    width: 0; height: 3px; background: var(--color-teal);
    border-radius: 3px 3px 0 0; transition: width .25s ease;
}
.nav-dot:hover, .nav-dot.active { color: var(--color-white); background: rgba(255,255,255,.08); text-decoration: none; transform: none; }
.nav-dot.active::after { width: 60%; }

/* ═══════════════════════════════════════
   BRAND LOGO (hidden — logos in topbar)
═══════════════════════════════════════ */
.brand-logo { display: none; }

/* ═══════════════════════════════════════
   FULLPAGE CONTAINER
═══════════════════════════════════════ */
.fullpage-container {
    position: fixed; top: var(--topbar-h); left: 0; right: 0; bottom: var(--bottomnav-h);
}

.fullpage-section {
    position: absolute; inset: 0;
    overflow-y: auto; overflow-x: hidden;
    opacity: 0; pointer-events: none;
    transform: translateY(28px);
    transition: opacity .55s cubic-bezier(.4,0,.2,1), transform .55s cubic-bezier(.4,0,.2,1);
    padding-bottom: 2rem;
    scrollbar-width: thin; scrollbar-color: rgba(0,123,135,.5) transparent;
}
.fullpage-section::-webkit-scrollbar { width: 6px; }
.fullpage-section::-webkit-scrollbar-thumb { background: rgba(0,123,135,.5); border-radius: 3px; }
.fullpage-section.active { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* Responsive rules → /css/shared/mobile.css */