/* Moj vjeronauk — učenička aplikacija. Mobile-first. */

:root {
	--kvd-bg: #f4f6f9;
	--kvd-card: #ffffff;
	--kvd-ink: #14171c;
	--kvd-ink-2: #5b6270;
	--kvd-ink-3: #8b93a1;
	--kvd-line: #e7eaef;
	--kvd-blue: #185fa5;
	--kvd-blue-2: #2b7fd0;
	--kvd-blue-bg: #e8f1fb;
	--kvd-green: #12a37a;
	--kvd-green-bg: #e2f6ef;
	--kvd-amber: #c9821a;
	--kvd-amber-bg: #fdf2df;
	--kvd-red: #a32d2d;
	--kvd-red-bg: #fcebeb;
	--kvd-r: 16px;
	--kvd-r-sm: 12px;
	--kvd-tab: 62px;
	--kvd-shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 6px 16px -8px rgba(16, 24, 40, .12);
	--kvd-shadow-lg: 0 2px 6px rgba(16, 24, 40, .06), 0 18px 36px -18px rgba(16, 24, 40, .28);
}

/* Tamna tema prati postavku uređaja — učenici uče i navečer. */
@media (prefers-color-scheme: dark) {
	:root {
		--kvd-bg: #12151a;
		--kvd-card: #1a1f27;
		--kvd-ink: #eef1f5;
		--kvd-ink-2: #a8b0bd;
		--kvd-ink-3: #7d8695;
		--kvd-line: #2a313c;
		--kvd-blue-bg: #16304b;
		--kvd-green-bg: #12352c;
		--kvd-amber-bg: #3a2c14;
		--kvd-red-bg: #3a1f1f;
		--kvd-shadow: 0 1px 2px rgba(0, 0, 0, .4);
		--kvd-shadow-lg: 0 18px 36px -18px rgba(0, 0, 0, .7);
	}
}

* { box-sizing: border-box; }

html, body {
	margin: 0;
	padding: 0;
	background: var(--kvd-bg);
	color: var(--kvd-ink);
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	font-size: 16px;
	line-height: 1.6;
	-webkit-text-size-adjust: 100%;
	-webkit-font-smoothing: antialiased;
}

body.kvd-app { padding-bottom: calc(var(--kvd-tab) + env(safe-area-inset-bottom)); }

h1, h2, h3 { font-weight: 650; margin: 0 0 4px; line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: 23px; }
h2 { font-size: 18px; }
h3 { font-size: 16px; }
p { margin: 0 0 8px; }

/* ---------- Prijava ---------- */

.kvd-login {
	display: flex; align-items: center; justify-content: center;
	min-height: 100vh; padding: 24px;
	background: radial-gradient(120% 80% at 50% 0%, var(--kvd-blue-bg) 0%, var(--kvd-bg) 55%);
}

.kvd-auth {
	width: 100%;
	max-width: 360px;
	background: var(--kvd-card);
	border-radius: 20px;
	padding: 30px 24px;
	text-align: center;
	box-shadow: var(--kvd-shadow-lg);
}

.kvd-auth__logo {
	width: 60px; height: 60px;
	margin: 0 auto 14px;
	border-radius: 18px;
	background: linear-gradient(140deg, var(--kvd-blue-2), var(--kvd-blue));
	color: #fff;
	font-size: 30px; line-height: 60px;
	box-shadow: 0 8px 20px -8px rgba(24, 95, 165, .8);
}

.kvd-auth__sub { color: var(--kvd-ink-2); font-size: 14px; margin-bottom: 20px; }
.kvd-auth label { display: block; text-align: left; font-size: 13px; color: var(--kvd-ink-2); margin: 12px 0 5px; font-weight: 500; }
.kvd-auth__help { font-size: 12px; color: var(--kvd-ink-3); margin: 18px 0 0; }

input[type="text"], input[type="password"] {
	width: 100%;
	padding: 13px 14px;
	font-size: 16px;
	border: 1.5px solid var(--kvd-line);
	border-radius: 12px;
	background: var(--kvd-card);
	color: var(--kvd-ink);
	transition: border-color .15s, box-shadow .15s;
}

input:focus {
	outline: none;
	border-color: var(--kvd-blue);
	box-shadow: 0 0 0 3px rgba(24, 95, 165, .15);
}

button, .kvd-btn {
	display: block;
	width: 100%;
	margin-top: 16px;
	padding: 13px;
	font-size: 16px;
	font-weight: 600;
	color: #fff;
	background: linear-gradient(140deg, var(--kvd-blue-2), var(--kvd-blue));
	border: none;
	border-radius: 12px;
	cursor: pointer;
	text-align: center;
	text-decoration: none;
	min-height: 48px;
	box-shadow: 0 6px 16px -8px rgba(24, 95, 165, .9);
	transition: transform .12s, box-shadow .12s, opacity .12s;
}

button:active, .kvd-btn:active { transform: translateY(1px); box-shadow: none; }
button[disabled] { opacity: .45; box-shadow: none; }

.kvd-btn--ghost {
	background: transparent;
	color: var(--kvd-ink);
	border: 1.5px solid var(--kvd-line);
	box-shadow: none;
	font-weight: 500;
}

.kvd-note { font-size: 13.5px; padding: 11px 13px; border-radius: 12px; margin-bottom: 12px; text-align: left; }
.kvd-note--err { background: var(--kvd-red-bg); color: var(--kvd-red); }
.kvd-note--ok { background: var(--kvd-green-bg); color: #0f6e56; }

/* ---------- Ljuska ---------- */

.kvd-boot { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 60vh; color: var(--kvd-ink-2); font-size: 14px; }

.kvd-spin {
	width: 18px; height: 18px;
	border: 2px solid var(--kvd-line);
	border-top-color: var(--kvd-blue);
	border-radius: 50%;
	animation: kvd-rot .7s linear infinite;
}

@keyframes kvd-rot { to { transform: rotate(360deg); } }

/* Kosturi umjesto prazne stranice dok se podaci učitavaju. */
.kvd-skel { border-radius: var(--kvd-r); background: var(--kvd-card); margin-bottom: 10px; overflow: hidden; position: relative; }
.kvd-skel::after {
	content: "";
	position: absolute; inset: 0;
	background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .55), transparent);
	animation: kvd-shimmer 1.3s infinite;
}

@media (prefers-color-scheme: dark) {
	.kvd-skel::after { background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .06), transparent); }
}

@keyframes kvd-shimmer { to { transform: translateX(100%); } }

.kvd-view { max-width: 660px; margin: 0 auto; padding: 18px 16px 8px; }
.kvd-view > * { animation: kvd-in .25s ease-out both; }

@keyframes kvd-in { from { opacity: 0; transform: translateY(6px); } }

.kvd-head { margin-bottom: 16px; }
.kvd-head h1 { margin-bottom: 2px; }
.kvd-head .kvd-sub { color: var(--kvd-ink-2); font-size: 14px; }

.kvd-label {
	font-size: 11.5px;
	font-weight: 650;
	letter-spacing: .06em;
	text-transform: uppercase;
	color: var(--kvd-ink-3);
	margin: 22px 0 8px;
}

/* ---------- Zaglavlje početne ---------- */

.kvd-hero {
	position: relative;
	border-radius: 20px;
	padding: 18px;
	margin-bottom: 18px;
	color: #fff;
	background: linear-gradient(140deg, var(--kvd-blue-2) 0%, var(--kvd-blue) 70%);
	box-shadow: var(--kvd-shadow-lg);
	display: flex;
	align-items: center;
	gap: 16px;
}

.kvd-hero h1 { color: #fff; font-size: 19px; line-height: 1.2; }
.kvd-hero__who { flex: 1; min-width: 0; }
.kvd-hero__sub { font-size: 13.5px; opacity: .85; }
.kvd-hero__sub a { color: #fff; text-decoration: underline; }

/* Prsten napretka — brojka je uvijek u sredini. */
.kvd-ring { position: relative; flex: none; }
.kvd-ring svg { display: block; transform: rotate(-90deg); }
.kvd-ring circle { fill: none; stroke-linecap: round; }
.kvd-ring__num {
	position: absolute; inset: 0;
	display: flex; align-items: center; justify-content: center;
	font-size: 15px; font-weight: 700;
}

.kvd-hero .kvd-ring__track { stroke: rgba(255, 255, 255, .28); }
.kvd-hero .kvd-ring__val { stroke: #fff; }
.kvd-ring__track { stroke: var(--kvd-line); }
.kvd-ring__val { stroke: var(--kvd-green); transition: stroke-dashoffset .5s ease; }

/* ---------- Kartice ---------- */

.kvd-card {
	display: block;
	background: var(--kvd-card);
	border-radius: var(--kvd-r);
	padding: 14px;
	margin-bottom: 10px;
	text-decoration: none;
	color: inherit;
	border: 1px solid var(--kvd-line);
	box-shadow: var(--kvd-shadow);
	transition: transform .12s, box-shadow .12s;
}

a.kvd-card:active { transform: scale(.985); box-shadow: none; }

.kvd-card--accent {
	background: linear-gradient(140deg, var(--kvd-blue-2), var(--kvd-blue));
	border-color: transparent;
	color: #fff;
	box-shadow: var(--kvd-shadow-lg);
}

.kvd-card--accent .kvd-card__meta { color: rgba(255, 255, 255, .82); }
.kvd-card--req { border-color: var(--kvd-blue); border-width: 1.5px; }
.kvd-card__title { font-weight: 600; font-size: 15.5px; }
.kvd-card__meta { font-size: 13px; color: var(--kvd-ink-2); }

.kvd-row { display: flex; align-items: center; gap: 12px; }
.kvd-row > :first-child { flex: 1; min-width: 0; }

.kvd-icon {
	width: 34px; height: 34px; flex: none;
	border-radius: 10px;
	background: var(--kvd-bg);
	color: var(--kvd-ink-3);
	display: flex; align-items: center; justify-content: center;
	font-size: 16px;
}

.kvd-card--accent .kvd-icon { background: rgba(255, 255, 255, .18); color: #fff; }

/* Oznaka teme s lijeve strane: redni broj ili kvačica kad je gotova. */
.kvd-dot {
	width: 34px; height: 34px; flex: none;
	border-radius: 50%;
	display: flex; align-items: center; justify-content: center;
	font-size: 13px; font-weight: 700;
	background: var(--kvd-bg);
	color: var(--kvd-ink-3);
	border: 1.5px solid var(--kvd-line);
}

.kvd-dot--done { background: var(--kvd-green-bg); color: var(--kvd-green); border-color: transparent; }
.kvd-dot--wip { background: var(--kvd-amber-bg); color: var(--kvd-amber); border-color: transparent; }

.kvd-chev { color: var(--kvd-ink-3); font-size: 20px; flex: none; line-height: 1; }

/* ---------- Traka napretka ---------- */

.kvd-bar { height: 7px; background: var(--kvd-line); border-radius: 99px; overflow: hidden; margin: 9px 0 4px; }
.kvd-bar > i { display: block; height: 100%; background: var(--kvd-green); border-radius: 99px; transition: width .4s ease; }
.kvd-card--accent .kvd-bar { background: rgba(255, 255, 255, .25); }
.kvd-card--accent .kvd-bar > i { background: #fff; }

/* ---------- Oznake ---------- */

.kvd-tag { display: inline-block; font-size: 11px; font-weight: 600; padding: 2px 9px; border-radius: 99px; vertical-align: 2px; }
.kvd-tag--done { background: var(--kvd-green-bg); color: #0a7358; }
.kvd-tag--wip { background: var(--kvd-amber-bg); color: #8a5a10; }
.kvd-tag--req { background: var(--kvd-blue-bg); color: #0c447c; }

/* ---------- Brojke ---------- */

.kvd-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.kvd-stat {
	background: var(--kvd-card);
	border: 1px solid var(--kvd-line);
	border-radius: var(--kvd-r);
	padding: 13px 14px;
	box-shadow: var(--kvd-shadow);
}

.kvd-stat b { display: block; font-size: 25px; font-weight: 700; line-height: 1.2; letter-spacing: -.02em; }
.kvd-stat span { font-size: 12.5px; color: var(--kvd-ink-2); }
.kvd-stat--ok b { color: var(--kvd-green); }
.kvd-stat--wip b { color: var(--kvd-amber); }

/* ---------- Donja navigacija ---------- */

.kvd-tabbar {
	position: fixed;
	left: 0; right: 0; bottom: 0;
	display: flex;
	background: color-mix(in srgb, var(--kvd-card) 88%, transparent);
	backdrop-filter: saturate(180%) blur(12px);
	-webkit-backdrop-filter: saturate(180%) blur(12px);
	border-top: 1px solid var(--kvd-line);
	padding-bottom: env(safe-area-inset-bottom);
	z-index: 10;
}

.kvd-tabbar a {
	flex: 1;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 3px;
	min-height: var(--kvd-tab);
	font-size: 11px;
	font-weight: 500;
	color: var(--kvd-ink-3);
	text-decoration: none;
	position: relative;
}

.kvd-tabbar a span { font-size: 19px; line-height: 1; transition: transform .15s; }
.kvd-tabbar a.is-active { color: var(--kvd-blue); }
.kvd-tabbar a.is-active span { transform: translateY(-1px) scale(1.08); }

.kvd-tabbar a.is-active::before {
	content: "";
	position: absolute; top: 0; left: 50%;
	width: 26px; height: 3px;
	transform: translateX(-50%);
	background: var(--kvd-blue);
	border-radius: 0 0 99px 99px;
}

/* ---------- Ostalo ---------- */

.kvd-back { display: inline-block; font-size: 13px; color: var(--kvd-ink-2); text-decoration: none; margin-bottom: 10px; }
.kvd-back:active { color: var(--kvd-blue); }

.kvd-empty {
	text-align: center;
	color: var(--kvd-ink-2);
	padding: 34px 20px;
	font-size: 14px;
	background: var(--kvd-card);
	border: 1.5px dashed var(--kvd-line);
	border-radius: var(--kvd-r);
}

.kvd-empty__icon { font-size: 32px; display: block; margin-bottom: 8px; opacity: .7; }
.kvd-empty strong { display: block; color: var(--kvd-ink); font-size: 15px; margin-bottom: 3px; }

.kvd-lesson {
	background: var(--kvd-card);
	border: 1px solid var(--kvd-line);
	border-radius: var(--kvd-r);
	padding: 15px 16px;
	margin-bottom: 10px;
	box-shadow: var(--kvd-shadow);
}

.kvd-lesson img { max-width: 100%; height: auto; border-radius: 10px; }

.kvd-quote {
	border-left: 3px solid var(--kvd-blue);
	padding: 2px 0 2px 13px;
	color: var(--kvd-ink-2);
	font-style: italic;
}

/* Ključni pojmovi kao zasebne pločice. */
.kvd-terms { display: flex; flex-wrap: wrap; gap: 7px; }

.kvd-terms span {
	font-size: 13px;
	padding: 5px 11px;
	border-radius: 99px;
	background: var(--kvd-blue-bg);
	color: #0c447c;
}

@media (prefers-color-scheme: dark) {
	.kvd-terms span { color: #9dc7f0; }
	.kvd-tag--req { color: #9dc7f0; }
}

/* ---------- Preglednik stranica ---------- */

.kvd-reader__page {
	background: var(--kvd-card);
	border: 1px solid var(--kvd-line);
	border-radius: var(--kvd-r);
	padding: 6px;
	margin-bottom: 12px;
	text-align: center;
	min-height: 200px;
	box-shadow: var(--kvd-shadow);
}

.kvd-reader__page img { max-width: 100%; height: auto; border-radius: 10px; display: block; margin: 0 auto; }

.kvd-reader__nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.kvd-reader__nav span { font-size: 14px; color: var(--kvd-ink-2); text-align: center; flex: 1; }
.kvd-reader__nav small { color: var(--kvd-ink-3); }

.kvd-reader__nav button {
	width: 58px;
	margin: 0;
	padding: 12px 0;
	font-size: 22px;
	line-height: 1;
	flex: none;
}

.kvd-reader__nav button[disabled] { opacity: .35; }

/* ---------- Zadatci ---------- */

.kvd-opt {
	display: flex;
	align-items: center;
	gap: 11px;
	width: 100%;
	margin: 0 0 9px;
	padding: 13px 14px;
	font-size: 15px;
	font-weight: 500;
	text-align: left;
	color: var(--kvd-ink);
	background: var(--kvd-card);
	border: 1.5px solid var(--kvd-line);
	border-radius: 13px;
	min-height: 50px;
	box-shadow: none;
	counter-increment: kvd-opt;
}

/* Slovo ispred odgovora — lakše se prati i lakše diktira u razredu. */
.kvd-opt::before {
	content: counter(kvd-opt, upper-alpha);
	flex: none;
	width: 26px; height: 26px;
	border-radius: 50%;
	background: var(--kvd-bg);
	color: var(--kvd-ink-3);
	font-size: 12px; font-weight: 700;
	display: flex; align-items: center; justify-content: center;
}

.kvd-opt.is-picked { border-color: var(--kvd-blue); background: var(--kvd-blue-bg); color: #0c447c; }
.kvd-opt.is-picked::before { background: var(--kvd-blue); color: #fff; }

@media (prefers-color-scheme: dark) {
	.kvd-opt.is-picked { color: #cfe4f8; }
}

.kvd-view { counter-reset: kvd-opt; }

input.kvd-match, input.kvd-fill {
	width: 100%;
	margin-top: 6px;
	padding: 12px;
	font-size: 16px;
	border: 1.5px solid var(--kvd-line);
	border-radius: 10px;
	background: var(--kvd-card);
	color: var(--kvd-ink);
}

input.kvd-fill { margin-bottom: 9px; }

.kvd-result {
	width: 76px; height: 76px;
	margin: 14px auto 14px;
	border-radius: 50%;
	background: var(--kvd-bg);
	color: var(--kvd-ink-3);
	font-size: 36px;
	line-height: 76px;
	border: 2px solid var(--kvd-line);
}

.kvd-result.is-ok {
	background: var(--kvd-green-bg);
	color: var(--kvd-green);
	border-color: transparent;
	animation: kvd-pop .35s ease-out;
}

@keyframes kvd-pop { from { transform: scale(.8); opacity: 0; } }

/* ---------- Podsjetnik za bilježnicu ---------- */

.kvd-remind {
	display: flex;
	gap: 12px;
	align-items: center;
	background: var(--kvd-amber-bg);
	border-radius: var(--kvd-r);
	padding: 13px 15px;
	margin: 16px 0 4px;
	font-size: 14px;
	color: #7a4a08;
}

.kvd-remind__icon { font-size: 19px; flex: none; }
.kvd-remind .kvd-card__meta { color: #8a5a10; }

@media (prefers-color-scheme: dark) {
	.kvd-remind { color: #e7c58a; }
	.kvd-remind .kvd-card__meta { color: #c79a55; }
}

/* Završetak teme — odvojen od sadržaja da se ne klikne slučajno. */
.kvd-finish:not(:empty) {
	margin-top: 24px;
	padding-top: 18px;
	border-top: 1px solid var(--kvd-line);
}

.kvd-finish .kvd-btn { margin-top: 6px; }

@media (min-width: 700px) {
	.kvd-hero h1 { font-size: 22px; }
	body.kvd-app { padding-bottom: 24px; padding-top: var(--kvd-tab); }
	.kvd-tabbar { top: 0; bottom: auto; border-top: none; border-bottom: 1px solid var(--kvd-line); }
	.kvd-tabbar a { flex-direction: row; gap: 8px; font-size: 14px; }
	.kvd-tabbar a.is-active::before { top: auto; bottom: 0; border-radius: 99px 99px 0 0; }
	.kvd-stats { grid-template-columns: repeat(4, 1fr); }
	.kvd-hero { padding: 22px; }
}

@media (prefers-reduced-motion: reduce) {
	* { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}