/* Frostrail Italia
 *
 * Dal gelo al fuoco: la pagina parte dalla bufera notturna, passa sulla neve, entra
 * nel treno e finisce davanti alla fornace. Il Discord è il fuoco acceso in fondo.
 * I ghiaccioli vengono dal logo, la brina sui finestrini cala man mano che ci si scalda.
 * Il blu violaceo è riservato al pulsante del Discord.
 *
 * 1. Font
 * 2. Colori e base
 * 3. Pulsanti
 * 4. Eroe e neve
 * 5. Il gioco, sulla neve
 * 6. I quattro finestrini
 * 7. Interno del treno e link
 * 8. Domande frequenti
 * 9. Chiusura e piede
 * 10. Pagine di testo
 * 11. Telefono e tablet
 * 12. Movimento
 */

/* 1. Font: file sul nostro server, licenza SIL Open Font License ------------- */

@font-face { font-family: "Alfa Slab One"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/alfa-slab-one-400.woff2") format("woff2"); }
@font-face { font-family: "Fira Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/fira-sans-400.woff2") format("woff2"); }
@font-face { font-family: "Fira Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/fira-sans-500.woff2") format("woff2"); }
@font-face { font-family: "Fira Sans"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/fira-sans-700.woff2") format("woff2"); }

/* 2. Colori e base --------------------------------------------------------- */

:root {
	--fri-notte: #0a1a2e;
	--fri-mezzanotte: #122a47;
	--fri-acciaio: #24384d;
	--fri-ferro: #191517;
	--fri-carbone: #231714;
	--fri-neve: #eef5fa;
	--fri-bianco: #fbfdff;
	--fri-brina: #c4d9e8;
	--fri-inchiostro: #10233a;
	--fri-grigio: #3f5468;
	--fri-brace: #e8741e;
	--fri-fuoco: #ffb24a;
	--fri-rame: #a4562a;
	--fri-cenere: #d9c7b8;
	--fri-verde-it: #1f8a4c;
	--fri-rosso-it: #c62f2b;
	--fri-rosso: #c8322c;
	--fri-rosso-acceso: #de423b;
	--fri-verde: #3ba55d;
	--fri-blu: #5865f2;
	--fri-blu-chiaro: #6c78f7;
	--fri-titoli: "Alfa Slab One", Rockwell, Georgia, serif;
	--fri-testo: "Fira Sans", "Segoe UI", Arial, sans-serif;
	--fri-sfondo-img: url("../img/sfondo.webp");
	--fri-tricolore: linear-gradient(90deg, var(--fri-verde-it) 0 33.33%, var(--fri-bianco) 33.33% 66.66%, var(--fri-rosso-it) 66.66%);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
	margin: 0;
	background: var(--fri-notte);
	color: var(--fri-bianco);
	font: 400 1.09rem/1.6 var(--fri-testo);
	-webkit-font-smoothing: antialiased;
	overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; }

:focus-visible { outline: 3px solid var(--fri-fuoco); outline-offset: 4px; }

h1, h2, h3 { font-family: var(--fri-titoli); font-weight: 400; }

/* Lettere di ghiaccio crepato, come il logo. Senza supporto resta il bianco. */
.fri-ghiaccio {
	color: var(--fri-bianco);
}

@supports (-webkit-background-clip: text) or (background-clip: text) {
	.fri-ghiaccio {
		background: url("../img/ghiaccio.webp") 0 40% / 900px auto;
		-webkit-background-clip: text;
		background-clip: text;
		color: transparent;
	}
}

/* 3. Pulsanti -------------------------------------------------------------- */

.fri-pulsanti {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 14px 16px;
}

.fri-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: .55em;
	border-radius: 8px;
	color: #fff;
	font-family: var(--fri-testo);
	font-weight: 700;
	line-height: 1;
	text-decoration: none;
	white-space: nowrap;
	transition: transform .2s, background-color .2s, box-shadow .2s;
}

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

.fri-btn--discord {
	padding: .85em 1.45em;
	background: var(--fri-blu);
	box-shadow: 0 10px 30px rgba(88, 101, 242, .5);
	font-size: clamp(1.25rem, 2vw, 1.42rem);
}

.fri-btn--discord:hover {
	background: var(--fri-blu-chiaro);
	box-shadow: 0 12px 36px rgba(108, 120, 247, .7);
}

.fri-btn--discord .fri-icona { width: 1.15em; height: 1.15em; }

.fri-btn--reddit {
	padding: .85em 1.25em;
	background: var(--fri-rosso);
	box-shadow: 0 8px 20px rgba(4, 12, 24, .45);
	font-size: 1.08rem;
}

.fri-btn--reddit:hover { background: var(--fri-rosso-acceso); }

.fri-btn--reddit .fri-icona { width: 1.1em; height: 1.1em; }

.fri-icona { flex: none; }

/* 4. Eroe e neve ----------------------------------------------------------- */

.fri-eroe {
	position: relative;
	min-height: 100vh;
	min-height: 100svh;
	padding: clamp(28px, 6vh, 64px) clamp(16px, 6vw, 96px) 56vh;
	overflow: hidden;
	isolation: isolate;
	background: var(--fri-notte);
}

/* Panorama in basso, cielo sopra: il testo sta nel cielo, il treno arriva da destra. */
.fri-eroe__sfondo {
	position: absolute;
	inset: 0;
	z-index: -2;
	background: var(--fri-sfondo-img) 100% 100% / cover no-repeat;
}

/* La neve del panorama diventa la neve della sezione dopo. */
.fri-eroe__sfondo::after {
	content: "";
	position: absolute;
	inset: auto 0 0;
	height: 16%;
	background: linear-gradient(180deg, rgba(238, 245, 250, 0), var(--fri-neve) 92%);
}

.fri-neve {
	position: absolute;
	inset: -640px 0 0;
	z-index: -1;
	background: url("../img/neve-vicina.svg"), url("../img/neve-lontana.svg");
	pointer-events: none;
}

.fri-eroe__corpo {
	display: flex;
	align-items: center;
	gap: clamp(24px, 3.4vw, 52px);
	width: 100%;
	max-width: 1240px;
	margin: 0 auto;
}

.fri-logo {
	flex: none;
	width: min(300px, 36vh);
	filter: drop-shadow(0 14px 28px rgba(2, 8, 18, .7));
}

.fri-eroe__testo {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	gap: 12px;
	min-width: 0;
}

.fri-titolo {
	margin: 0;
	font-size: clamp(3.2rem, 6.6vw, 6rem);
	line-height: 1;
}

.fri-motto {
	display: block;
	margin-bottom: .5em;
	color: var(--fri-brina);
	font: 500 clamp(1.05rem, 1.5vw, 1.2rem)/1.25 var(--fri-testo);
}

.fri-invito {
	margin: 0 0 8px;
	max-width: 30em;
	font-size: 1.2rem;
	line-height: 1.4;
	text-wrap: balance;
	text-shadow: 0 1px 10px rgba(4, 12, 24, .95);
}

.fri-numeri {
	margin: 2px 0 0;
	font-weight: 500;
	color: var(--fri-brina);
	text-shadow: 0 1px 8px rgba(4, 12, 24, .9);
}

.fri-numeri strong { color: var(--fri-bianco); font-weight: 700; }

.fri-pallino {
	display: inline-block;
	width: 8px;
	height: 8px;
	margin: 0 .5em .16em 0;
	border-radius: 50%;
	background: var(--fri-verde);
	box-shadow: 0 0 8px var(--fri-verde);
	vertical-align: middle;
}

.fri-giu {
	position: absolute;
	left: 50%;
	bottom: 14px;
	z-index: 2;
	translate: -50% 0;
	padding: 8px;
	color: var(--fri-inchiostro);
}

.fri-giu:hover { color: var(--fri-rame); }

.fri-giu:focus-visible { outline-color: var(--fri-inchiostro); }

/* 5. Il gioco, sulla neve --------------------------------------------------- */

.fri-gioco {
	margin-top: -1px;
	padding: 48px 16px 150px;
	background: var(--fri-neve);
	color: var(--fri-inchiostro);
}

.fri-gioco__corpo { max-width: 1140px; margin: 0 auto; }

.fri-gioco :focus-visible { outline-color: var(--fri-inchiostro); }

.fri-coppia {
	display: grid;
	grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
	align-items: center;
	gap: clamp(28px, 5vw, 64px);
}

.fri-coppia__testo h2 {
	margin: 0 0 16px;
	font-size: clamp(2.2rem, 4.2vw, 3.1rem);
	line-height: 1.06;
}

.fri-coppia__testo p { margin: 0 0 14px; max-width: 34em; }

.fri-coppia__testo p:last-child { margin-bottom: 0; }

.fri-foto {
	width: 100%;
	border-radius: 4px;
	box-shadow: 0 22px 44px -18px rgba(16, 35, 58, .6);
}

/* Quattro dati su una riga, separati come traversine. */
.fri-dati {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	margin: 56px 0 0;
	border-block: 3px solid var(--fri-inchiostro);
}

.fri-dati > div { padding: 18px 22px 20px; }

.fri-dati > div + div { border-left: 1px solid rgba(16, 35, 58, .3); }

.fri-dati dt { color: var(--fri-grigio); font-size: 1rem; font-weight: 500; }

.fri-dati dd {
	margin: 4px 0 0;
	font: 400 clamp(1.2rem, 2vw, 1.5rem)/1.15 var(--fri-titoli);
}

.fri-nota {
	max-width: 44em;
	margin: 24px auto 0;
	color: var(--fri-grigio);
	text-align: center;
	text-wrap: balance;
}

/* 6. I quattro finestrini: la memoria visiva della pagina ------------------- */

.fri-binari {
	position: relative;
	padding: 120px 16px 80px;
	background: linear-gradient(180deg, var(--fri-notte), var(--fri-mezzanotte) 34%, var(--fri-acciaio) 68%, var(--fri-ferro));
}

/* Ghiaccioli di neve che pendono dal bordo della sezione sopra. */
.fri-ghiaccioli {
	position: absolute;
	inset: -1px 0 auto;
	height: 110px;
	background: url("../img/ghiaccioli.svg") 0 0 / 1600px 110px repeat-x;
	pointer-events: none;
}

.fri-binari > h2 {
	max-width: 1080px;
	margin: 0 auto 52px;
	font-size: clamp(2.2rem, 4.6vw, 3.3rem);
	line-height: 1.06;
}

.fri-binari__elenco {
	display: grid;
	gap: clamp(40px, 6vw, 72px);
	max-width: 1080px;
	margin: 0 auto;
	padding: 0;
	list-style: none;
}

.fri-tappa {
	--brina: 1;
	display: grid;
	grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
	align-items: center;
	gap: clamp(24px, 4vw, 56px);
}

.fri-tappa:nth-child(2) { --brina: .72; }
.fri-tappa:nth-child(3) { --brina: .42; }
.fri-tappa:nth-child(4) { --brina: .12; }

.fri-tappa:nth-child(even) { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

.fri-tappa:nth-child(even) .fri-finestrino { order: 2; }

.fri-tappa__testo h3 {
	margin: 0 0 8px;
	font-size: clamp(1.6rem, 2.8vw, 2.1rem);
	line-height: 1.1;
}

.fri-tappa__testo p { margin: 0; max-width: 30em; color: #e3edf4; }

/* Finestrino di carrozza: telaio di ferro con i ribattini, vetro con gli angoli tondi. */
.fri-finestrino {
	--ribattino: radial-gradient(circle at 40% 35%, #8fa3b5 0 1.2px, #41525f 2.6px, transparent 3.2px);
	position: relative;
	padding: 18px;
	border-radius: 30px;
	background:
		var(--ribattino) 0 0 / 46px 18px repeat-x,
		var(--ribattino) 0 100% / 46px 18px repeat-x,
		linear-gradient(160deg, #36444f, #1e262e 60%, #2a333b);
	box-shadow: 0 0 0 1px rgba(196, 217, 232, .22), 0 26px 44px -16px rgba(2, 8, 18, .8);
}

.fri-finestrino img {
	width: 100%;
	aspect-ratio: 25 / 16;
	object-fit: cover;
	border-radius: 16px;
}

.fri-finestrino::after {
	content: "";
	position: absolute;
	inset: 18px;
	border-radius: 16px;
	background: url("../img/brina.webp") center / 100% 100% no-repeat;
	box-shadow: inset 0 0 0 2px rgba(2, 8, 18, .55), inset 0 4px 16px rgba(2, 8, 18, .5);
	opacity: var(--brina);
	pointer-events: none;
}

/* 7. Interno del treno e link ----------------------------------------------- */

.fri-interno {
	margin-top: -1px;
	padding: 24px 16px 64px;
	background: linear-gradient(180deg, var(--fri-ferro), var(--fri-carbone));
}

/* Tre foto attaccate, una striscia sola: siamo dentro il treno. */
.fri-interno__foto {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 6px;
	max-width: 1240px;
	margin: 0 auto;
}

.fri-interno__foto img { width: 100%; }

.fri-link {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 10px 36px;
	margin: 36px 0 0;
	padding: 0;
	list-style: none;
}

.fri-link a {
	font-weight: 700;
	text-decoration-color: var(--fri-fuoco);
	text-decoration-thickness: 2px;
	text-underline-offset: 5px;
}

.fri-link a:hover { color: var(--fri-fuoco); }

/* 8. Domande frequenti ----------------------------------------------------- */

.fri-domande {
	margin-top: -1px;
	padding: 48px max(16px, calc((100% - 780px) / 2)) 88px;
	background: var(--fri-carbone);
}

.fri-domande > h2 {
	margin: 0 0 22px;
	font-size: clamp(2.1rem, 4.2vw, 2.9rem);
	line-height: 1.06;
}

.fri-domande details { border-top: 1px solid rgba(217, 199, 184, .3); }

.fri-domande details:last-of-type { border-bottom: 1px solid rgba(217, 199, 184, .3); }

.fri-domande summary {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 18px;
	padding: 14px 2px;
	cursor: pointer;
	list-style: none;
}

.fri-domande summary::-webkit-details-marker { display: none; }

.fri-domande summary::after {
	content: "+";
	flex: none;
	color: var(--fri-fuoco);
	font: 700 1.6rem/1 var(--fri-testo);
	transition: rotate .2s;
}

.fri-domande details[open] summary::after { rotate: 45deg; }

.fri-domande h3 { margin: 0; font: 500 1.16rem/1.3 var(--fri-testo); }

.fri-domande details p { margin: 0 0 16px; max-width: 40em; color: var(--fri-cenere); }

/* 9. Chiusura e piede ------------------------------------------------------ */

.fri-chiusura {
	position: relative;
	margin-top: -1px;
	padding: 96px 16px 120px;
	overflow: hidden;
	isolation: isolate;
	background: var(--fri-carbone);
	text-align: center;
}

/* La fornace: il calore sale dal fondo e pulsa piano. */
.fri-brace {
	position: absolute;
	inset: 0;
	z-index: -1;
	background:
		radial-gradient(70% 90% at 50% 112%, var(--fri-fuoco) 0, var(--fri-brace) 34%, rgba(164, 62, 22, .75) 58%, rgba(35, 23, 20, 0) 100%);
}

.fri-chiusura__corpo { position: relative; }

.fri-chiusura h2 {
	margin: 0;
	color: var(--fri-bianco);
	font-size: clamp(2.8rem, 8vw, 5.4rem);
	line-height: 1.04;
	text-wrap: balance;
	text-shadow: 0 3px 26px rgba(35, 12, 4, .75);
}

.fri-chiusura p {
	margin: 14px auto 28px;
	max-width: 34em;
	font-size: 1.16rem;
	font-weight: 500;
	text-wrap: balance;
	text-shadow: 0 1px 12px rgba(35, 12, 4, .9);
}

.fri-chiusura .fri-pulsanti { justify-content: center; }

.fri-chiusura .fri-btn--discord { box-shadow: 0 12px 30px rgba(35, 12, 4, .6); }

.fri-chiusura .fri-btn--reddit { box-shadow: 0 8px 20px rgba(35, 12, 4, .5); }

.fri-chiusura :focus-visible { outline-color: var(--fri-bianco); }

.fri-piede {
	position: relative;
	padding: 28px 16px 30px;
	background: var(--fri-ferro);
	color: var(--fri-cenere);
	text-align: center;
	font-size: .98rem;
	line-height: 1.5;
}

.fri-piede::before {
	content: "";
	position: absolute;
	inset: 0 0 auto;
	height: 4px;
	background: var(--fri-tricolore);
}

.fri-piede p { margin: 0 auto 6px; max-width: 60em; }

/* 10. Pagine di testo ------------------------------------------------------ */

.fri-pagina {
	max-width: 720px;
	margin: 0 auto;
	padding: 40px 16px 88px;
}

.fri-pagina__logo { display: inline-block; margin-bottom: 24px; }

.fri-pagina__logo img { width: 84px; }

.fri-pagina h1 {
	font-size: clamp(2.2rem, 6.6vw, 3rem);
	line-height: 1.06;
}

.fri-pagina h2 { font: 700 1.45rem/1.2 var(--fri-testo); }

.fri-pagina a { color: var(--fri-bianco); text-decoration-color: var(--fri-fuoco); }

/* Le tabelle scorrono dentro il loro riquadro: sul telefono non allargano la pagina. */
.fri-pagina figure { margin: 1.25em 0; overflow-x: auto; }

.fri-pagina table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: .98rem; line-height: 1.4; }

.fri-pagina th, .fri-pagina td { padding: .6em .75em; border: 1px solid rgba(251, 253, 255, .25); text-align: left; vertical-align: top; }

/* 11. Telefono e tablet ---------------------------------------------------- */

@media (max-width: 860px) {
	.fri-eroe { padding-top: 24px; padding-bottom: 38vh; text-align: center; }

	.fri-eroe__sfondo { background-position: 92% 100%; }

	.fri-eroe__corpo { flex-direction: column; gap: 14px; }

	.fri-eroe__testo { align-items: center; }

	.fri-logo { width: min(52vw, 220px, 28vh); }

	.fri-motto { margin-inline: auto; }

	.fri-coppia { grid-template-columns: minmax(0, 1fr); }

	.fri-dati { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 40px; }

	.fri-dati > div { padding: 14px 16px 16px; }

	.fri-dati > div:nth-child(odd) { border-left: 0; }

	.fri-dati > div:nth-child(n + 3) { border-top: 1px solid rgba(16, 35, 58, .3); }

	.fri-tappa,
	.fri-tappa:nth-child(even) { grid-template-columns: minmax(0, 1fr); gap: 18px; }

	.fri-tappa:nth-child(even) .fri-finestrino { order: 0; }

	.fri-interno__foto { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 700px) {
	.fri-pulsanti { flex-direction: column; align-items: stretch; width: 100%; }

	.fri-chiusura .fri-pulsanti { max-width: 340px; margin: 0 auto; }

	.fri-gioco { padding-bottom: 120px; }

	.fri-ghiaccioli { height: 74px; background-size: 1080px 74px; }

	.fri-binari { padding-top: 96px; }

	.fri-finestrino { padding: 12px; border-radius: 22px; }

	.fri-finestrino img { border-radius: 12px; }

	.fri-finestrino::after { inset: 12px; border-radius: 12px; }
}

/* 12. Movimento: la neve che cade e il respiro della fornace. ---------------- */

@media (prefers-reduced-motion: no-preference) {
	.fri-neve { animation: fri-nevica 26s linear infinite; will-change: transform; }

	.fri-brace { animation: fri-respira 5s ease-in-out infinite alternate; }

	.fri-eroe__corpo { animation: fri-appare .8s ease-out both; }
}

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
}

@keyframes fri-nevica {
	from { transform: translate3d(0, 0, 0); }
	to   { transform: translate3d(-160px, 640px, 0); }
}

@keyframes fri-respira {
	from { opacity: .82; }
	to   { opacity: 1; }
}

@keyframes fri-appare {
	from { opacity: 0; }
	to   { opacity: 1; }
}