/* Heic-To v2.5. Google / Material 3, refined, with a light/dark switch.
   Tonal surfaces instead of heavy borders, large rounded panels, one blue, pill actions.
   Roboto for text, Outfit for display. Follows the system light/dark setting. */

:root {
	color-scheme: light dark;
	--bg: #f8fafd;
	--surface: #ffffff;
	--container: #f0f4f9;
	--container-high: #e9eef6;
	--ink: #1f1f1f;
	--muted: #444746;
	--outline: #c4c7c5;
	--primary: #0b57d0;
	--primary-hover: #0842a0;
	--on-primary: #ffffff;
	--primary-container: #d3e3fd;
	--on-primary-container: #041e49;
	--tint: #eaf1fb;
	--ok: #146c2e;
	--ok-container: #c4eed0;
	--on-ok-container: #072711;
	--bad: #b3261e;
	--bad-container: #f9dedc;
	--warn: #f9ab00;
	--elev: 0 1px 2px rgba(60,64,67,.25), 0 2px 6px 2px rgba(60,64,67,.12);

	--font: Roboto, "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
	--display: "Google Sans", "Product Sans", Outfit, Roboto, "Segoe UI", system-ui, sans-serif;
	--wrap: 1040px;
}
@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--bg: #131314;
		--surface: #1e1f20;
		--container: #282a2c;
		--container-high: #333537;
		--ink: #e3e3e3;
		--muted: #c4c7c5;
		--outline: #444746;
		--primary: #a8c7fa;
		--primary-hover: #d3e3fd;
		--on-primary: #062e6f;
		--primary-container: #0842a0;
		--on-primary-container: #d3e3fd;
		--tint: #1f2b3f;
		--ok: #6dd58c;
		--ok-container: #0f5223;
		--on-ok-container: #c4eed0;
		--bad: #f2b8b5;
		--bad-container: #601410;
		--elev: 0 1px 2px rgba(0,0,0,.6), 0 2px 6px 2px rgba(0,0,0,.3);
	}
}
:root[data-theme="dark"] {
	color-scheme: dark;
	--bg: #131314;
	--surface: #1e1f20;
	--container: #282a2c;
	--container-high: #333537;
	--ink: #e3e3e3;
	--muted: #c4c7c5;
	--outline: #444746;
	--primary: #a8c7fa;
	--primary-hover: #d3e3fd;
	--on-primary: #062e6f;
	--primary-container: #0842a0;
	--on-primary-container: #d3e3fd;
	--tint: #1f2b3f;
	--ok: #6dd58c;
	--ok-container: #0f5223;
	--on-ok-container: #c4eed0;
	--bad: #f2b8b5;
	--bad-container: #601410;
	--elev: 0 1px 2px rgba(0,0,0,.6), 0 2px 6px 2px rgba(0,0,0,.3);
}
:root[data-theme="light"] { color-scheme: light; }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1rem/1.6 var(--font); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; }
a { color: var(--primary); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
[hidden] { display: none !important; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--bg); padding: 8px 16px; z-index: 50; border-radius: 999px; }
.skip:focus { left: 8px; }
.muted { color: var(--muted); }

h1, h2, h3 { font-family: var(--display); color: var(--ink); margin: 0; }
h1 { font-weight: 400; font-size: clamp(2.3rem, 5.2vw, 3.6rem); line-height: 1.1; letter-spacing: -.015em; }
h2 { font-weight: 400; font-size: clamp(1.5rem, 2.6vw, 1.95rem); line-height: 1.25; }
h3 { font-weight: 500; font-size: 1.15rem; line-height: 1.3; }

/* ---------- theme toggle ---------- */
.header-right { display: flex; align-items: center; gap: 4px; }
.theme-toggle { width: 40px; height: 40px; border: 0; border-radius: 50%; background: transparent; color: var(--muted); display: grid; place-items: center; cursor: pointer; }
.theme-toggle:hover { background: var(--container); color: var(--ink); }
.theme-toggle svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .i-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) .theme-toggle .i-moon { display: none; }
	:root:not([data-theme="light"]) .theme-toggle .i-sun { display: block; }
}

/* ---------- top app bar ---------- */
.site-header { background: var(--bg); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 16px; min-height: 68px; max-width: 1200px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--muted); font: 500 1.3rem/1 var(--display); }
.brand-mark { width: 30px; height: 30px; color: var(--primary); flex: none; }
.brand b { color: var(--primary); font-weight: 500; }
.nav { display: flex; gap: 2px; }
.nav a { color: var(--muted); text-decoration: none; font: 500 .9rem/1 var(--font); padding: 11px 18px; border-radius: 999px; }
.nav a:hover { background: var(--container); color: var(--ink); text-decoration: none; }
.nav a[aria-current="page"] { background: var(--primary-container); color: var(--on-primary-container); }

/* ---------- hero + tool ---------- */
.hero { padding-top: 48px; padding-bottom: 24px; }
.hero h1 { max-width: 20ch; }
.hero .sub { max-width: 54ch; margin: 16px 0 32px; color: var(--muted); font-size: 1.15rem; line-height: 1.55; }
.hero-center { text-align: center; }
.hero-center h1, .hero-center .sub { margin-left: auto; margin-right: auto; }
.crumbs { font-size: .85rem; color: var(--muted); margin: 0 0 18px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

.tool { max-width: 940px; margin: 0 auto; text-align: left; background: var(--container); border-radius: 28px; padding: 14px 14px 18px; }
.tool-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 6px 12px 14px; }
.tool-head .route { font: 500 1rem/1.3 var(--display); }
.tool-head .tag { display: inline-flex; align-items: center; gap: 8px; font: 500 .78rem/1 var(--font); color: var(--muted); }
.tool-head .tag::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--ok); flex: none; }
.tool-head .tag.is-server::before { background: var(--warn); }

.viewfinder { position: relative; min-height: 210px; display: grid; place-items: center; text-align: center; padding: 32px 20px; cursor: pointer; border: 2px dashed var(--outline); border-radius: 20px; background: var(--surface); transition: background-color .15s ease, border-color .15s ease; }
.viewfinder:hover { background: var(--tint); border-color: var(--primary); }
.viewfinder.is-over { background: var(--tint); border-color: var(--primary); border-style: solid; }
.vf-corner { display: none; }
.vf-icon { width: 52px; height: 52px; margin: 0 auto 14px; border-radius: 50%; background: var(--primary-container); color: var(--on-primary-container); display: grid; place-items: center; }
.vf-icon svg { width: 26px; height: 26px; fill: currentColor; }
.vf-title { margin: 0; font: 400 1.55rem/1.3 var(--display); }
.vf-sub { margin: 6px 0 0; color: var(--muted); font-size: .95rem; }
.viewfinder:focus-visible { outline-offset: 3px; border-radius: 20px; }
.viewfinder.is-compact { min-height: 0; padding: 14px 20px; display: block; }
.viewfinder.is-compact .vf-sub, .viewfinder.is-compact .vf-icon { display: none; }
.viewfinder.is-compact .vf-title { font: 500 1rem/1.3 var(--font); color: var(--primary); }
.link-btn { background: none; border: 0; padding: 0; font: inherit; font-weight: 500; color: var(--primary); text-decoration: underline; text-underline-offset: .2em; cursor: pointer; }

.controls { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 18px 28px; padding: 18px 12px 4px; }
.controls fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
.controls legend, .control > label { font: 500 .78rem/1.2 var(--font); color: var(--muted); padding: 0; margin: 0 0 8px; display: block; letter-spacing: .02em; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip { position: relative; display: block; }
.chip input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.chip span { display: block; padding: 7px 14px; border: 1px solid var(--outline); border-radius: 8px; font: 500 .875rem/1.4 var(--font); color: var(--ink); background: var(--surface); }
.chip input:hover + span { background: var(--bg); }
.chip input:checked + span { background: var(--primary-container); border-color: transparent; color: var(--on-primary-container); }
.chip input:checked + span::before { content: "\2713"; margin-right: 6px; font-weight: 700; }
.chip input:focus-visible + span { outline: 3px solid var(--primary); outline-offset: 2px; }
.chips .sep { width: 1px; height: 22px; background: var(--outline); margin: 0 4px; }
.control select { font: 400 .92rem/1.3 var(--font); padding: 8px 12px; border-radius: 8px; border: 1px solid var(--outline); background: var(--surface); color: var(--ink); }
.control input[type="range"] { width: 150px; accent-color: var(--primary); vertical-align: middle; }
.control output { display: inline-block; min-width: 2.2em; margin-left: 8px; font: 500 .92rem/1 var(--font); }
.control.check { display: flex; align-items: center; gap: 10px; flex-basis: 100%; font-size: .92rem; color: var(--muted); }
.control.check label { font: inherit !important; color: inherit; letter-spacing: 0; margin: 0; }
.control.check input { width: 18px; height: 18px; accent-color: var(--primary); margin: 0; }
.tool-note { margin: 12px 12px 0; padding: 12px 16px; background: var(--surface); border-radius: 12px; font-size: .9rem; color: var(--muted); }
.tool-error { margin: 12px 12px 0; padding: 12px 16px; background: var(--bad-container); border-radius: 12px; color: var(--bad); font-size: .92rem; font-weight: 500; }

/* results */
.sheet { margin-top: 16px; background: var(--surface); border-radius: 20px; overflow: hidden; }
.sheet-head { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; padding: 12px 20px; border-bottom: 1px solid var(--container-high); }
.sheet-head p { margin: 0; font: 500 .9rem/1.3 var(--font); color: var(--muted); }
.sheet-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.frames { list-style: none; margin: 0; padding: 0; }
.frame { display: grid; grid-template-columns: 52px 1fr auto; gap: 16px; align-items: center; padding: 10px 20px; border-bottom: 1px solid var(--container-high); }
.frame:last-child { border-bottom: 0; }
.frame:hover { background: var(--bg); }
.frame-thumb { width: 52px; height: 52px; background: var(--container); display: grid; place-items: center; overflow: hidden; border-radius: 12px; }
.frame-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.frame-ph { font: 700 1.1rem var(--font); color: var(--bad); }
.frame.is-working .frame-thumb, .frame.is-queued .frame-thumb { background: linear-gradient(100deg, var(--container) 30%, var(--container-high) 50%, var(--container) 70%); background-size: 200% 100%; animation: sheen 1.3s linear infinite; }
@keyframes sheen { from { background-position: 100% 0; } to { background-position: -100% 0; } }
.frame-body { min-width: 0; }
.frame-name { margin: 0; font: 500 .95rem/1.35 var(--font); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.frame-meta { margin: 2px 0 0; font: 400 .85rem/1.4 var(--font); color: var(--muted); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.frame-meta.is-error { color: var(--bad); }
.delta { display: inline-block; padding: 1px 8px; border-radius: 6px; background: var(--ok-container); color: var(--on-ok-container); font-weight: 500; font-size: .78rem; }
.delta.is-larger { background: var(--container); color: var(--muted); }
.frame-actions { display: flex; align-items: center; gap: 4px; }
.icon-btn { width: 36px; height: 36px; border-radius: 50%; border: 0; background: transparent; font-size: 1.3rem; line-height: 1; color: var(--muted); cursor: pointer; }
.icon-btn:hover { background: var(--container); color: var(--ink); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5em; padding: .65em 1.5em; border-radius: 999px; background: var(--primary); color: var(--on-primary); font: 500 .92rem/1.2 var(--font); border: 0; cursor: pointer; text-decoration: none; transition: box-shadow .15s ease, background-color .15s ease; }
.btn:hover { background: var(--primary-hover); color: var(--on-primary); box-shadow: var(--elev); text-decoration: none; }
.btn:disabled { opacity: .6; cursor: progress; }
.btn-ghost { background: transparent; color: var(--primary); }
.btn-ghost:hover { background: var(--tint); color: var(--primary); box-shadow: none; }
.btn-tonal { background: var(--primary-container); color: var(--on-primary-container); }
.btn-tonal:hover { background: var(--primary-container); color: var(--on-primary-container); box-shadow: var(--elev); }
.btn-small { padding: .45em 1.1em; font-size: .85rem; }

/* ---------- content panels ---------- */
main > .band { background: var(--surface); border-radius: 28px; margin: 16px auto; max-width: 1136px; padding: 56px 0; }
.band .wrap { padding: 0 48px; max-width: 1136px; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 56px; align-items: start; }
.split-even { grid-template-columns: 1fr 1fr; gap: 48px; }
.prose > * { max-width: 66ch; }
.prose h2 { margin: 2.4rem 0 .7rem; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin: 1.5rem 0 .4rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1rem; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin-bottom: .4rem; }
.prose strong { font-weight: 500; }
.prose code { font: 400 .9em ui-monospace, Menlo, Consolas, monospace; background: var(--container); padding: .1em .35em; border-radius: 4px; }
.prose table { border-collapse: collapse; width: 100%; max-width: 66ch; margin: 0 0 1.3rem; font-size: .95rem; }
.prose th, .prose td { text-align: left; padding: 11px 14px 11px 0; border-bottom: 1px solid var(--container-high); vertical-align: top; }
.prose th { font: 500 .82rem/1.3 var(--font); color: var(--muted); border-bottom: 1px solid var(--outline); }
.prose .callout { max-width: 66ch; padding: 14px 20px; background: var(--container); border-radius: 16px; margin: 0 0 1.3rem; }
.prose .callout p:last-child { margin-bottom: 0; }

ol.steps { list-style: none; counter-reset: s; padding: 0 !important; }
ol.steps li { counter-increment: s; position: relative; padding-left: 48px; margin-bottom: 1.05rem; min-height: 32px; }
ol.steps li::before { content: counter(s); position: absolute; left: 0; top: -2px; width: 32px; height: 32px; border-radius: 50%; background: var(--primary-container); color: var(--on-primary-container); font: 500 .95rem/32px var(--display); text-align: center; }

.aside { position: sticky; top: 20px; }
.aside h2 { font: 500 .95rem/1.2 var(--display); color: var(--ink); margin: 0 0 10px; }
.facts { margin: 0 0 28px; display: grid; grid-template-columns: auto 1fr; background: var(--container); border-radius: 20px; padding: 6px 20px; }
.facts dt, .facts dd { margin: 0; padding: 11px 0; border-bottom: 1px solid var(--container-high); font-size: .92rem; }
.facts dt { color: var(--muted); padding-right: 18px; }
.facts dt:nth-last-of-type(1), .facts dd:last-of-type { border-bottom: 0; }
.rows { list-style: none; margin: 0 0 28px; padding: 6px; background: var(--container); border-radius: 20px; }
.rows a { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 11px 14px; border-radius: 14px; text-decoration: none; color: var(--ink); font-weight: 500; font-size: .95rem; }
.rows a span { color: var(--muted); font-weight: 400; font-size: .82rem; text-align: right; }
.rows a:hover { background: var(--container-high); color: var(--ink); }

.cards { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.cards a { display: block; height: 100%; padding: 18px 20px; background: var(--container); border-radius: 20px; text-decoration: none; color: var(--ink); transition: background-color .15s ease, box-shadow .15s ease; }
.cards a:hover { background: var(--primary-container); box-shadow: none; }
.cards b { display: block; font: 500 1.1rem/1.3 var(--display); }
.cards span { display: block; margin-top: 4px; color: var(--muted); font-size: .88rem; line-height: 1.4; }
.cards a:hover span { color: var(--on-primary-container); }

.spec { margin: 0; display: grid; grid-template-columns: 8rem 1fr; background: var(--container); border-radius: 20px; padding: 6px 4px; font-size: .95rem; }
.spec dt, .spec dd { margin: 0; padding: 11px 16px; border-bottom: 1px solid var(--container-high); }
.spec dt { color: var(--muted); font-weight: 500; }
.spec dt:nth-last-of-type(1), .spec dd:last-of-type { border-bottom: 0; }
.spec dd b { font-weight: 500; color: var(--ok); }

details.faq { background: var(--container); border-radius: 16px; margin: 0 0 8px; padding: 0 22px; max-width: 70ch; }
details.faq summary { cursor: pointer; font: 500 1.02rem/1.5 var(--display); padding: 16px 36px 16px 0; position: relative; list-style: none; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; position: absolute; right: 2px; top: 13px; font: 400 1.5rem/1 var(--font); color: var(--primary); }
details.faq[open] summary::after { content: "\2212"; }
details.faq .answer { padding: 0 0 16px; max-width: 64ch; color: var(--muted); }
details.faq .answer p { margin: 0 0 .6rem; }

.guide-list { list-style: none; margin: 0; padding: 0; }
.guide-list li { margin: 0 -16px; }
.guide-list a { display: block; padding: 16px; border-radius: 16px; text-decoration: none; color: var(--ink); }
.guide-list a:hover { background: var(--container); }
.guide-list strong { display: block; font: 500 1.15rem/1.35 var(--display); color: var(--primary); }
.guide-list p { margin: 3px 0 0; color: var(--muted); max-width: 64ch; font-size: .95rem; }
.article-meta { color: var(--muted); font-size: .88rem; margin: 12px 0 0; }

.filter { width: 100%; max-width: 440px; padding: 13px 22px; font: 400 1rem var(--font); border: 0; border-radius: 999px; background: var(--container); color: var(--ink); margin: 0 0 28px; }
.filter:focus { background: var(--surface); box-shadow: var(--elev); outline: none; }

form.contact { display: grid; gap: 16px; max-width: 480px; }
form.contact label { font: 500 .85rem/1.2 var(--font); color: var(--muted); display: block; margin-bottom: 6px; }
form.contact input[type="email"], form.contact input[type="text"], form.contact textarea { width: 100%; font: inherit; padding: 13px 16px; border: 1px solid var(--outline); border-radius: 12px; background: var(--surface); color: var(--ink); }
form.contact input:focus, form.contact textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }
form.contact textarea { min-height: 150px; resize: vertical; }
.hp { position: absolute; left: -9999px; }
.flash { padding: 12px 18px; border-radius: 12px; background: var(--ok-container); color: var(--on-ok-container); max-width: 480px; margin-bottom: 18px; font-weight: 500; }
.flash.bad { background: var(--bad-container); color: var(--bad); }

/* ---------- footer ---------- */
.site-footer { background: var(--container); border-radius: 28px 28px 0 0; margin-top: 16px; padding: 44px 0 30px; font-size: .92rem; color: var(--muted); }
.site-footer .wrap { max-width: 1136px; padding: 0 48px; }
.site-footer .cols { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.site-footer h2 { font: 500 .85rem/1.2 var(--font); color: var(--ink); margin-bottom: 12px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 7px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--primary); text-decoration: underline; }
.site-footer p { margin: 12px 0 0; max-width: 34ch; }
.site-footer .legal { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--outline); font-size: .8rem; max-width: none; }

@media (max-width: 920px) {
	.split, .split-even { grid-template-columns: 1fr; gap: 40px; }
	.aside { position: static; }
	.cards { grid-template-columns: 1fr 1fr; }
	.site-footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
	.wrap, .band .wrap, .site-footer .wrap { padding: 0 20px; }
	.hero { padding-top: 28px; }
	main > .band { border-radius: 20px; margin: 10px 8px; padding: 36px 0; max-width: none; }
	.tool { border-radius: 22px; padding: 10px 10px 14px; margin: 0; }
	.tool-head { flex-direction: column; align-items: flex-start; gap: 6px; }
	.viewfinder { min-height: 180px; padding: 26px 14px; }
	.controls { padding: 16px 8px 2px; gap: 16px 22px; }
	.control input[type="range"] { width: 140px; }
	.sheet-head, .frame { padding-left: 14px; padding-right: 12px; }
	.cards { grid-template-columns: 1fr; }
	.spec { grid-template-columns: 1fr; }
	.spec dt { border-bottom: 0; padding-bottom: 0; }
	.site-footer { border-radius: 20px 20px 0 0; }
	.site-footer .cols { grid-template-columns: 1fr; }
	.site-header .wrap { min-height: 60px; }
	.brand { font-size: 1.15rem; gap: 8px; }
	.brand-mark { width: 26px; height: 26px; }
	.nav a { padding: 9px 9px; font-size: .85rem; }
	.theme-toggle { width: 36px; height: 36px; }
}
@media (prefers-reduced-motion: reduce) {
	* { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}