/* Departmental design system — layered on top of the compiled Tailwind utilities.
   Visual language adopted from the unimaideee.tech theme. */
:root {
  --navy: #0A2A5E;
  --navy-900: #061A3D;
  --theme-blue: #143D80;
  --blue: #1E63D6;
  --accent: #3CC6F5;
  --bg: #EDF4FD;
}

html { scroll-behavior: smooth; }
body { font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif; }
h1, h2, h3, .font-heading { font-family: "Bitter", Georgia, serif; letter-spacing: -.01em; }
.font-display { font-family: "Prata", Georgia, serif; font-weight: 400; letter-spacing: -.5px; }
[x-cloak] { display: none !important; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.skip-link { position: absolute; left: -999px; top: 0; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 100; background: #fff; padding: .5rem 1rem; border-radius: .5rem; }

/* ---------- Preloader ---------- */
#pre-load { position: fixed; inset: 0; z-index: 9999; display: grid; place-items: center; background: var(--navy-900); transition: opacity .5s ease, visibility .5s; }
#pre-load.is-done { opacity: 0; visibility: hidden; }
#pre-load .ring { width: 92px; height: 92px; border-radius: 50%; border: 3px solid rgba(255,255,255,.12); border-top-color: var(--accent); animation: spinslow 1s linear infinite; position: absolute; }

/* ---------- Header ---------- */
.site-header { transition: background-color .35s ease, box-shadow .35s ease, color .35s ease; }
.site-header.is-overlay:not(.is-scrolled) { background: transparent; color: #fff; box-shadow: none; border-color: rgba(255,255,255,.14); }
.site-header.is-overlay:not(.is-scrolled) .nav-link:hover { background: rgba(255,255,255,.1); }
.site-header.is-scrolled, .site-header:not(.is-overlay) { background: rgba(255,255,255,.97); color: var(--navy); box-shadow: 0 10px 30px -18px rgba(6,26,61,.45); backdrop-filter: blur(8px); }
.nav-link { position: relative; }
.nav-link::after { content: ""; position: absolute; left: .75rem; right: .75rem; bottom: .2rem; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .3s ease; }
.nav-link:hover::after, .nav-link.is-active::after { transform: scaleX(1); }

/* ---------- Buttons (theme "rs-btn" feel) ---------- */
.btn-theme { display: inline-flex; align-items: center; gap: .6rem; border-radius: 999px; padding: .85rem 1.6rem; font-weight: 600; transition: all .3s ease; position: relative; overflow: hidden; isolation: isolate; }
.btn-theme .btn-icon { display: grid; place-items: center; width: 1.9rem; height: 1.9rem; border-radius: 999px; transition: transform .35s ease; }
.btn-theme:hover .btn-icon { transform: rotate(-45deg); }
.btn-accent { background: var(--accent); color: var(--navy-900); }
.btn-accent .btn-icon { background: var(--navy-900); color: var(--accent); }
.btn-accent:hover { background: #6DD6FA; box-shadow: 0 12px 30px -12px rgba(60,198,245,.6); }
.btn-navy { background: var(--navy); color: #fff; }
.btn-navy .btn-icon { background: var(--accent); color: var(--navy-900); }
.btn-navy:hover { background: var(--theme-blue); }
.btn-ghost { border: 1px solid rgba(255,255,255,.45); color: #fff; }
.btn-ghost .btn-icon { background: rgba(255,255,255,.15); }
.btn-ghost:hover { background: #fff; color: var(--navy); }

/* ---------- Section titles ---------- */
.eyebrow { display: inline-flex; align-items: center; gap: .55rem; font-size: .78rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; color: var(--blue); }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--accent); }
.eyebrow.is-light { color: var(--accent); }
.eyebrow.is-center::after { content: ""; width: 28px; height: 2px; background: var(--accent); }

/* ---------- Hero video carousel ---------- */
.hero-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity 1.1s ease, visibility 1.1s; }
.hero-slide.is-active { opacity: 1; visibility: visible; z-index: 2; }
.hero-slide.is-leaving { opacity: 0; visibility: visible; z-index: 1; }
.hero-slide .hero-media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transform: scale(1.06); transition: transform 7s ease-out; }
.hero-slide.is-active .hero-media { transform: scale(1); }
/* Text animations: slide in on enter, slide up and out on leave */
.hero-copy .line { display: inline-block; overflow: hidden; padding-bottom: .1em; margin-bottom: -.1em; vertical-align: top; }
.hero-copy .line > span { display: inline-block; transform: translateY(110%); transition: transform 1s cubic-bezier(.2,.75,.15,1); }
.hero-copy .from-left { opacity: 0; transform: translateX(-40px); transition: opacity .8s ease, transform .9s cubic-bezier(.2,.75,.15,1); }
.hero-copy .from-below { opacity: 0; transform: translateY(30px); transition: opacity .8s ease, transform .9s cubic-bezier(.2,.75,.15,1); }
.hero-slide.is-active .hero-copy .line > span { transform: none; transition-delay: calc(.3s + var(--i, 0) * 75ms); }
.hero-slide.is-active .hero-copy .from-left { opacity: 1; transform: none; transition-delay: .2s; }
.hero-slide.is-active .hero-copy .from-below { opacity: 1; transform: none; transition-delay: .65s; }
.hero-slide.is-active .hero-copy .from-below.later { transition-delay: .85s; }
.hero-slide.is-leaving .hero-copy .line > span { transform: translateY(-110%); transition-duration: .6s; }
.hero-slide.is-leaving .hero-copy .from-left, .hero-slide.is-leaving .hero-copy .from-below { opacity: 0; transform: translateY(-20px); transition-duration: .5s; }
/* Chapter tabs */
.hero-tab { position: relative; text-align: left; padding: 1.1rem 0 .2rem; color: rgba(255,255,255,.6); transition: color .3s; }
.hero-tab:hover, .hero-tab.is-active { color: #fff; }
.hero-tab .track { position: absolute; top: 0; left: 0; right: 0; height: 2px; background: rgba(255,255,255,.22); overflow: hidden; border-radius: 2px; }
.hero-tab .bar { position: absolute; inset: 0; width: 0; background: var(--accent); }
.hero-tab.is-active .bar.is-running { width: 100%; transition-property: width; transition-timing-function: linear; }
.hero-tab.is-done .bar { width: 100%; background: rgba(255,255,255,.55); }
.hero-tab .num { font-family: "Bitter", serif; font-weight: 700; color: var(--accent); }
.scroll-cue { width: 26px; height: 42px; border: 2px solid rgba(255,255,255,.55); border-radius: 14px; position: relative; }
.scroll-cue::after { content: ""; position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; border-radius: 2px; background: var(--accent); animation: cue 1.8s ease-in-out infinite; }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(12px); } }

/* ---------- Scroll reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(32px); transition: opacity .9s cubic-bezier(.2,.7,.2,1), transform .9s cubic-bezier(.2,.7,.2,1); }
[data-reveal="left"] { transform: translateX(-40px); }
[data-reveal="right"] { transform: translateX(40px); }
[data-reveal="zoom"] { transform: scale(.94); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- Image hover zoom ---------- */
.img-zoom { overflow: hidden; }
.img-zoom img { transition: transform 1s cubic-bezier(.2,.7,.2,1); }
.group:hover .img-zoom img, .img-zoom:hover img { transform: scale(1.07); }

/* ---------- Parallax background ---------- */
.parallax { background-attachment: fixed; background-size: cover; background-position: center; }
@media (hover: none) { .parallax { background-attachment: scroll; } }

/* ---------- Marquee ---------- */
.marquee-track { display: flex; width: max-content; animation: marquee 45s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }

/* ---------- Carousels ---------- */
.carousel { display: flex; gap: 1.5rem; overflow-x: auto; scroll-snap-type: x mandatory; scroll-behavior: smooth; scrollbar-width: none; padding-bottom: .5rem; }
.carousel::-webkit-scrollbar { display: none; }
.carousel > * { scroll-snap-align: start; flex-shrink: 0; }

/* ---------- Circle text badge ---------- */
.circle-text { position: absolute; inset: 0; animation: spinslow 22s linear infinite; }

/* ---------- Back to top progress ---------- */
#backtotop { position: fixed; right: 1.5rem; bottom: 1.5rem; z-index: 50; width: 50px; height: 50px; border-radius: 999px; background: #fff; box-shadow: 0 10px 25px -10px rgba(6,26,61,.5); display: grid; place-items: center; opacity: 0; visibility: hidden; transform: translateY(15px); transition: all .3s; }
#backtotop.is-visible { opacity: 1; visibility: visible; transform: none; }
#backtotop svg.ring { position: absolute; inset: 0; transform: rotate(-90deg); }
#backtotop .progress { stroke-dasharray: 145; stroke-dashoffset: 145; transition: stroke-dashoffset .1s linear; }

/* ---------- Form controls (rendered by Django) ---------- */
.form-stack label { display: block; font-size: .875rem; font-weight: 600; color: #143D80; margin-bottom: .4rem; }
.form-stack .helptext, .form-stack .help { display: block; font-size: .75rem; color: #4E6A93; margin-top: .35rem; }
.form-stack > div, .form-stack > p { margin-bottom: 1.15rem; }
.form-stack ul.errorlist, ul.errorlist { color: #B42318; font-size: .8125rem; margin: .35rem 0 0; list-style: none; padding: 0; }
.form-stack input[type=text], .form-stack input[type=email], .form-stack input[type=password],
.form-stack input[type=number], .form-stack input[type=url], .form-stack input[type=datetime-local],
.form-stack input[type=date], .form-stack select, .form-stack textarea, .input {
  width: 100%; border: 1px solid #D3DFF0; border-radius: .85rem; padding: .75rem 1rem; background: #F5F9FE;
  font-size: .9375rem; color: #0A2A5E; transition: border-color .2s, box-shadow .2s, background-color .2s;
}
.form-stack input::placeholder, .form-stack textarea::placeholder, .input::placeholder { color: #8DA2C0; }
.form-stack input:focus, .form-stack select:focus, .form-stack textarea:focus, .input:focus {
  background: #fff; border-color: var(--blue); box-shadow: 0 0 0 4px rgba(30,99,214,.14); outline: none;
}
.form-stack input[type=checkbox] { width: 1.05rem; height: 1.05rem; margin-right: .5rem; vertical-align: middle; accent-color: var(--blue); }
.form-stack input[type=file] { width: 100%; font-size: .875rem; border: 1px dashed #B7C9E4; border-radius: .85rem; padding: .7rem; background: #F5F9FE; }
.form-stack input[type=file]::file-selector-button { margin-right: .8rem; border: 0; border-radius: .6rem; padding: .45rem .9rem; background: var(--navy); color: #fff; font-weight: 600; cursor: pointer; }
.input-dark { background: rgba(255,255,255,.07) !important; border-color: rgba(255,255,255,.2) !important; color: #fff !important; }
.input-dark::placeholder { color: rgba(255,255,255,.55); }

/* Mark-entry grid */
.mark-input { width: 4.5rem; text-align: right; border: 1px solid #CBD2D9; border-radius: .375rem; padding: .3rem .45rem; font-variant-numeric: tabular-nums; }
.mark-input:focus { border-color: var(--blue); box-shadow: 0 0 0 2px rgba(30,99,214,.2); outline: none; }
.tabular { font-variant-numeric: tabular-nums; }

.prose-dept p { margin-bottom: 1rem; line-height: 1.8; color: #2C4870; }
.prose-dept h2 { font-family: "Bitter", serif; font-size: 1.35rem; font-weight: 700; color: var(--navy); margin: 1.5rem 0 .5rem; }

.hero-pattern {
  background-color: var(--navy-900);
  background-image:
    linear-gradient(100deg, rgba(6,26,61,.96) 0%, rgba(10,42,94,.88) 55%, rgba(20,61,128,.7) 100%),
    url("../images/placeholders/parallax.svg");
  background-size: cover; background-position: center;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
  .marquee-track { animation: none; }
}

@media print {
  header, footer, nav, .no-print, #backtotop, #pre-load { display: none !important; }
  body { background: #fff !important; }
}

@keyframes kenburns { from { transform: scale(1); } to { transform: scale(1.12); } }
@keyframes spinslow { to { transform: rotate(360deg); } }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes floaty { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.animate-floaty { animation: floaty 6s ease-in-out infinite; }
.icon-btn { transition: background-color .25s; }
.icon-btn:hover { background: rgba(10,42,94,.07); }
.site-header.is-overlay:not(.is-scrolled) .icon-btn:hover { background: rgba(255,255,255,.12); }
.site-header.is-overlay.is-scrolled .topbar { display: none; }

/* Hero pause/play icon swap */
.hero-pause .icon-play { display: none; }
[data-hero].is-paused .hero-pause .icon-play { display: block; }
[data-hero].is-paused .hero-pause .icon-pause { display: none; }