/*
 * Project: PHP Gallery
 * Repository: https://github.com/klusik/PHP_gallery
 * File: website/assets/site.css
 * Module Type: Presentation stylesheet
 * Purpose: Explore restrained translucent surfaces around photographic content.
 * Responsibilities: Theme tokens, responsive layout, focus and touch geometry.
 * Author: Rudolf Klusal
 * License: MIT License
 */
:root {
    color-scheme: light;
    --paper: #f3f5f5;
    --ink: #182a32;
    --muted: #586b73;
    --quiet: #6a7d84;
    --accent: #436a7d;
    --panel-rgb: 255, 255, 255;
    --line: rgb(34 61 73 / 15%);
    --glass: rgba(var(--panel-rgb), .61);
    --dense-glass: rgba(var(--panel-rgb), .84);
    --tint: rgb(68 106 125 / 8%);
    --shadow: 0 22px 80px rgb(35 60 71 / 10%);
    /* Type: lengths. Units: px. Scope: website controls. Consumers: all actions.
       Rationale: visible controls stay compact; narrow/coarse targets expand. */
    --control-height: 32px;
    --control-radius: 6px;
    --control-icon: 16px;
    /* Type: time. Units: ms. Scope: hover/theme feedback. Consumers: controls.
       Rationale: brief feedback, disabled for reduced-motion preference. */
    --feedback-duration: 160ms;
}
html[data-theme="dark"] {
    color-scheme: dark;
    --paper: #111d24;
    --ink: #e9eff1;
    --muted: #adbdc5;
    --quiet: #9ab0bc;
    --accent: #a5c9d7;
    --panel-rgb: 31, 48, 58;
    --line: rgb(201 224 235 / 17%);
    --glass: rgba(var(--panel-rgb), .62);
    --dense-glass: rgba(var(--panel-rgb), .88);
    --tint: rgb(179 215 231 / 9%);
    --shadow: 0 22px 80px rgb(0 0 0 / 21%);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 26px; }
body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 15px/1.65 "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
button, a, input, summary { touch-action: manipulation; }
button:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible {
    outline: 2px solid var(--accent); outline-offset: 4px;
}
img { display: block; max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { line-height: 1.12; }
p { color: var(--muted); }
[hidden] { display: none !important; }
.icon-definitions { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: var(--control-icon); height: var(--control-icon); fill: none; stroke: currentColor; stroke-width: 1.65; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; vertical-align: middle; }
.wrap { width: min(1232px, calc(100% - 80px)); margin-inline: auto; }
.skip { position: absolute; left: 20px; top: -100px; z-index: 20; background: var(--dense-glass); padding: 10px 16px; }
.skip:focus { top: 12px; }
.ambient { position: absolute; inset: 0 0 auto; height: 870px; z-index: -1; pointer-events: none; overflow: hidden; background: radial-gradient(ellipse at 85% 26%, rgb(150 184 191 / 21%), transparent 58%), radial-gradient(ellipse at 34% 63%, rgb(222 218 196 / 23%), transparent 60%); }
.masthead { display: flex; align-items: center; gap: 24px; min-height: 96px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; letter-spacing: -.65px; white-space: nowrap; }
.brand-mark { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 8px; background: var(--glass); font: 700 24px/1 Georgia, serif; padding-bottom: 4px; letter-spacing: -1.8px; }
.main-navigation { display: flex; align-items: center; gap: 25px; margin-left: auto; font-size: 13px; }
.main-navigation a { display: inline-flex; align-items: center; min-height: var(--control-height); color: var(--muted); }
.main-navigation a:hover { color: var(--ink); }
.header-tools { display: flex; align-items: center; gap: 9px; }
.github-link { display: flex; align-items: center; gap: 6px; min-height: var(--control-height); font-size: 13px; }
.github-link .icon { width: 13px; height: 13px; }
.tool-divider { height: 17px; border-left: 1px solid var(--line); margin-inline: 4px; }
.icon-button, .language-toggle { display: inline-flex; align-items: center; justify-content: center; width: var(--control-height); height: var(--control-height); background: transparent; border: 0; border-radius: var(--control-radius); padding: 0; }
.icon-button:hover, .language-toggle:hover { background: var(--tint); }
.language-toggle { font-size: 11px; font-weight: 650; letter-spacing: .5px; }
.hero { display: grid; grid-template-columns: .87fr 1.13fr; gap: 52px; align-items: center; padding-block: 76px 57px; }
.hero-copy { padding-bottom: 21px; }
.eyebrow { font-size: 10px; font-weight: 650; letter-spacing: 1.9px; line-height: 1.6; color: var(--accent); display: flex; align-items: center; gap: 8px; }
.little-star { font-size: 18px; font-weight: 400; line-height: 1; }
h1 { font-size: clamp(45px, 4.65vw, 66px); font-weight: 600; letter-spacing: -3px; margin-block: 23px 24px; line-height: 1.07; }
.quiet-heading { color: var(--quiet); }
.hero-lead { font-size: 16px; line-height: 1.85; max-width: 370px; }
.hero-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 30px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 36px; padding: 7px 12px; gap: 8px; border: 1px solid var(--line); border-radius: var(--control-radius); background: var(--glass); font-size: 12px; font-weight: 600; color: var(--ink); white-space: nowrap; transition: background var(--feedback-duration), border-color var(--feedback-duration); }
.button:hover { background: var(--dense-glass); border-color: var(--accent); }
.button.primary { border-color: color-mix(in srgb, var(--accent) 47%, transparent); background: var(--tint); }
.text-link { background: transparent; border-color: transparent; padding-inline: 7px; }
.text-link:hover { border-color: transparent; background: var(--tint); }
.hero-footnote { display: flex; align-items: center; gap: 7px; margin-top: 19px; font-size: 11px; color: var(--muted); }
.hero-footnote .icon { width: 13px; height: 13px; color: var(--accent); }
.product-preview { position: relative; min-width: 0; isolation: isolate; }
.preview-backdrop { position: absolute; inset: -19px -20px 16px 40px; border-radius: 30px; z-index: -1; background: url("assets/real-gallery.jpg") center/cover; opacity: .21; filter: blur(27px); }
.glass { background: var(--glass); -webkit-backdrop-filter: blur(18px) saturate(1.06); backdrop-filter: blur(18px) saturate(1.06); }
.preview-window { border: 1px solid var(--line); border-radius: 9px; box-shadow: var(--shadow); overflow: hidden; }
.preview-titlebar { display: flex; align-items: center; justify-content: space-between; min-height: 46px; padding-inline: 17px; gap: 12px; border-bottom: 1px solid var(--line); }
.preview-brand { display: inline-flex; align-items: center; gap: 7px; font-size: 11px; font-weight: 650; }
.mini-mark { font: 700 18px/1 Georgia, serif; letter-spacing: -1px; padding-bottom: 3px; }
.preview-window-tools { display: flex; align-items: center; gap: 13px; color: var(--muted); }
.preview-window-tools > .icon { width: 12px; height: 12px; }
.preview-status { display: flex; align-items: center; gap: 5px; font-size: 9px; }
.preview-status > span:first-child, .release-dot { display: inline-block; width: 5px; height: 5px; background: #5a8b73; border-radius: 50%; }

/* Native radio tabs preserve screenshot selection without browser JavaScript. */
.visually-hidden, .capture-choice { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; clip-path: inset(50%); overflow: hidden; white-space: nowrap; }
.capture-tabs { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); min-width: 0; padding: 0; margin: 0; border: 0; }
.capture-tabs > label { display: flex; align-items: center; justify-content: center; gap: 6px; min-height: 42px; font-size: 10px; color: var(--muted); border-bottom: 1px solid var(--line); cursor: pointer; }
.capture-tabs > label .icon { width: 13px; height: 13px; }
.capture-choice:checked + label { color: var(--ink); box-shadow: inset 0 -1px var(--accent); background: var(--tint); }
.capture-choice:focus-visible + label { outline: 2px solid var(--accent); outline-offset: -4px; }
.screenshot-panel { display: none; grid-column: 1 / -1; grid-row: 2; min-width: 0; }
#capture-gallery:checked ~ #panel-gallery, #capture-viewer:checked ~ #panel-viewer, #capture-music:checked ~ #panel-music { display: block; }
/* Never crop, recolor or repaint the captured application interface. */
.actual-screen-button { display: block; width: 100%; padding: 0; background: #121921; cursor: zoom-in; }
.actual-screen-button img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: contain; }
.screen-source-line { display: flex; align-items: center; justify-content: space-between; gap: 10px; border-top: 1px solid var(--line); padding: 7px 12px; font-size: 10px; color: var(--muted); }
.screen-source-line a { display: inline-flex; align-items: center; gap: 5px; min-height: 30px; color: var(--accent); }
.screen-source-line .icon { width: 11px; height: 11px; }
figcaption { display: flex; justify-content: center; margin-top: 15px; color: var(--muted); font-size: 10px; }
.foundation-strip { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; padding-block: 22px; border-block: 1px solid var(--line); font-size: 10px; color: var(--muted); }
.foundation-strip > span, .foundation-strip > a { display: inline-flex; align-items: center; gap: 8px; }
.foundation-strip .icon { width: 13px; height: 13px; }
.foundation-strip strong { font-size: 10px; font-weight: 600; color: var(--ink); }
.release-dot { width: 4px; height: 4px; background: #568475; border-radius: 50%; }
.features-section { padding-block: 72px 76px; }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: end; margin-bottom: 44px; }
.section-heading h2 { font-size: 36px; font-weight: 550; letter-spacing: -1.5px; margin-top: 20px; max-width: 400px; }
.section-heading > p { font-size: 13px; line-height: 1.9; max-width: 415px; }
.feature-columns { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 38px; }
.feature-columns article { border-top: 1px solid var(--line); padding-top: 23px; min-width: 0; }
.feature-symbol { display: block; color: var(--accent); margin-bottom: 22px; }
.feature-columns h3 { font-size: 17px; letter-spacing: -.45px; font-weight: 600; margin-bottom: 12px; }
.feature-columns p { font-size: 12px; line-height: 1.95; max-width: 310px; }
.feature-columns .text-link { margin-top: 15px; font-size: 11px; }
.story-section { display: grid; grid-template-columns: 1fr .82fr; gap: 80px; align-items: center; padding-block: 38px 72px; }
.story-photograph { min-width: 0; }
.story-photograph .actual-screen-button { border: 1px solid var(--line); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow); }
.story-photograph img { aspect-ratio: auto; }
.story-copy h2 { font-size: 35px; font-weight: 550; letter-spacing: -1.5px; margin-block: 17px; }
.story-copy > p:not(.eyebrow) { font-size: 13px; line-height: 1.9; }
.story-details { margin-top: 21px; }
.story-details details { border-top: 1px solid var(--line); }
.story-details details:last-child { border-bottom: 1px solid var(--line); }
.story-details summary { display: flex; align-items: center; gap: 10px; min-height: 47px; padding: 10px 0; list-style: none; font-size: 12px; }
summary::-webkit-details-marker { display: none; }
.story-details summary .icon { width: 14px; height: 14px; color: var(--accent); }
.story-details summary .icon:last-child { margin-left: auto; width: 12px; height: 12px; }
.story-details details[open] summary .icon:last-child { transform: rotate(90deg); }
.story-details details > p { padding: 0 16px 15px 24px; font-size: 12px; line-height: 1.9; }
.start-section { display: flex; align-items: center; justify-content: space-between; gap: 40px; border-block: 1px solid var(--line); padding-block: 47px; }
.start-section h2 { font-size: 29px; font-weight: 550; letter-spacing: -1px; margin-block: 12px; }
.start-section p:not(.eyebrow) { font-size: 12px; line-height: 1.85; }
.start-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; flex-shrink: 0; }
.button, .text-link { display: inline-flex; justify-content: center; align-items: center; gap: 8px; min-height: 36px; font-size: 12px; font-weight: 600; }
.text-link:hover { color: var(--accent); }
.footer { padding-block: 31px 23px; }
.footer-main { display: flex; align-items: center; gap: 22px; }
.footer-main .brand { font-size: 13px; }
.footer-main .brand-mark { width: 25px; height: 25px; font-size: 20px; border-radius: 6px; }
.footer-main p { font-size: 11px; }
.footer-main > div { display: flex; gap: 19px; margin-left: auto; font-size: 11px; color: var(--muted); }
.capture-credits { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 14px; font-size: 11px; color: var(--muted); }
.capture-credits p { margin-top: 10px; max-width: 760px; }
.capture-credits a { text-decoration: underline; }
.languages { position: relative; font-size: 11px; }
.languages summary { padding: 10px 7px; list-style: none; }
.language-list { position: absolute; right: 0; top: 100%; min-width: 170px; padding: 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--dense-glass); backdrop-filter: blur(18px); box-shadow: var(--shadow); z-index: 5; }
.language-list a { display: block; padding: 8px; }
.language-list a:hover, .language-list [aria-current] { background: var(--tint); }
.screenshot-dialog { width: min(1150px,calc(100vw - 48px)); max-width: none; max-height: calc(100dvh - 40px); margin: auto; padding: 0; border: 1px solid #ffffff33; border-radius: 8px; background: #12212a; color: #f3f7f9; overflow: auto; }
.screenshot-dialog::backdrop { background: #081117cc; backdrop-filter: blur(14px); }
.dialog-top { display: flex; align-items: center; gap: 15px; padding: 12px 15px; }
.dialog-top h2 { font-size: 14px; font-weight: 500; }
.dialog-top > span { color: #bac8d0; font-size: 10px; margin-left: auto; }
.screenshot-dialog button { display: grid; place-items: center; width: 44px; height: 44px; flex-shrink: 0; padding: 0; color: #f8fbfc; background: #0d181e75; border: 1px solid #ffffff40; border-radius: 6px; }
.dialog-top button { margin-left: auto; }
.dialog-stage { display: grid; grid-template-columns: 44px minmax(0,1fr) 44px; align-items: center; gap: 12px; padding: 0 12px; }
[data-previous-capture] .icon { transform: rotate(180deg); }
.dialog-image { width: 100%; height: min(65dvh,730px); object-fit: contain; }
.dialog-authenticity { margin: 0; padding: 10px 16px; font-size: 11px; line-height: 1.5; color: #bac8d0; border-top: 1px solid #ffffff14; }
.dialog-footer { display: flex; justify-content: space-between; gap: 12px; padding: 12px 16px; font-size: 10px; color: #bac8d0; }
.dialog-footer a { color: #d5edf7; text-decoration: underline; text-underline-offset: 3px; }
/* Documentation uses the same palette while retaining release-pinned content. */
.docs-hero { padding: 64px 0 44px; max-width: 900px; }
.docs-hero h1 { font-size: clamp(40px,5vw,66px); margin: 18px 0 24px; }
.docs-hero .lead { font-size: 17px; max-width: 720px; }
.release-strip { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; padding: 20px 0; border-block: 1px solid var(--line); font-size: 12px; }
.release-strip a { color: var(--accent); font-weight: 600; }
.tabs { display: flex; gap: 28px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding: 16px 0; font-size: 13px; }
.section { padding: 60px 0; border-bottom: 1px solid var(--line); }
.section h2 { font-size: 32px; font-weight: 550; letter-spacing: -1px; }
.steps { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 40px; margin: 36px 0; }
.steps h3 { font-size: 19px; margin: 18px 0 12px; }
.steps p { font-size: 14px; }
.number { font-size: 11px; color: var(--accent); }
.manual-list { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 16px; margin-top: 32px; }
.manual { display: block; border: 1px solid var(--line); padding: 24px; border-radius: 6px; background: var(--glass); }
.manual strong { display: block; font-size: 23px; margin-bottom: 12px; }
.manual small { font-size: 11px; color: var(--muted); }
.references { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 32px; margin-block: 32px 24px; }
.references h3 { font-size: 17px; margin-bottom: 12px; }
.references p, .note, .runtime-note { font-size: 13px; }
.runtime-note { margin-block: 28px; }
@media (max-width: 1100px) {
    .hero { gap: 26px; grid-template-columns: .9fr 1.1fr; padding-block: 62px 45px; }
    h1 { font-size: 48px; letter-spacing: -2.4px; }
    .hero-lead { font-size: 14px; }
    .story-section { gap: 40px; }
    .main-navigation { gap: 17px; }
    .masthead { gap: 19px; }
    .foundation-strip { justify-content: flex-start; gap: 15px 26px; }
}
@media (max-width: 800px) {
    .wrap { width: calc(100% - 40px); }
    .masthead { min-height: 78px; flex-wrap: wrap; gap: 10px; padding-block: 15px; }
    .brand { font-size: 17px; }
    .main-navigation { order: 3; width: 100%; justify-content: center; padding-top: 7px; gap: 26px; }
    .header-tools { margin-left: auto; }
    .hero { grid-template-columns: 1fr; gap: 37px; padding-block: 47px 32px; }
    .hero-copy { padding: 0; max-width: 520px; }
    h1 { font-size: clamp(43px,7.6vw,61px); }
    .product-preview { max-width: 650px; width: 100%; margin-inline: auto; }
    .preview-backdrop { left: 25px; right: 0; }
    .section-heading { gap: 30px; }
    .section-heading h2, .story-copy h2 { font-size: 30px; }
    .feature-columns { gap: 23px; }
    .story-section { grid-template-columns: 1fr 1fr; gap: 25px; }
    .footer-main { flex-wrap: wrap; gap: 15px; }
    .footer-main p { order: 3; flex-basis: 100%; }
    .manual-list { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 560px) {
    :root { --control-height: 44px; }
    .wrap { width: calc(100% - 36px); }
    .masthead { padding-block: 12px 3px; }
    .brand { gap: 7px; font-size: 15px; }
    .brand-mark { width: 28px; height: 28px; font-size: 22px; }
    .github-link { display: none; }
    .header-tools { gap: 2px; }
    .main-navigation { gap: 25px; padding-top: 0; font-size: 12px; }
    .hero { padding-top: 37px; gap: 31px; }
    .hero .eyebrow { font-size: 8px; letter-spacing: 1.5px; }
    h1 { font-size: 46px; letter-spacing: -2.5px; }
    .hero-lead { font-size: 14px; line-height: 1.85; }
    .button, .text-link { min-height: 44px; font-size: 11px; }
    .hero-actions { gap: 6px; }
    .hero-footnote { font-size: 10px; }
    .preview-titlebar { padding-inline: 12px; min-height: 42px; }
    .preview-brand { font-size: 10px; }
    .preview-status { font-size: 8px; }
    .capture-tabs > label { min-height: 44px; gap: 4px; font-size: 9px; }
    .screen-source-line { flex-wrap: wrap; gap: 0 8px; font-size: 9px; }
    .screen-source-line a { min-height: 44px; }
    .foundation-strip { font-size: 9px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px 10px; }
    .foundation-strip > span, .foundation-strip > a { min-width: 0; gap: 5px; flex-wrap: wrap; }
    .foundation-strip .icon { width: 12px; height: 12px; }
    .features-section { padding-block: 46px 32px; }
    .eyebrow { font-size: 9px; letter-spacing: 1.4px; }
    .section-heading { grid-template-columns: 1fr; gap: 17px; margin-bottom: 27px; }
    .section-heading h2 { font-size: 31px; margin-top: 13px; }
    .section-heading > p { font-size: 12px; line-height: 1.85; }
    .feature-columns { grid-template-columns: 1fr; gap: 25px; }
    .feature-columns article { display: grid; grid-template-columns: 25px 1fr; gap: 0 12px; padding-top: 20px; }
    .feature-symbol { grid-row: 1 / span 3; margin: 0; }
    .feature-columns h3 { margin-bottom: 9px; }
    .feature-columns p { max-width: none; }
    .feature-columns .text-link { margin-top: 8px; justify-self: start; }
    .story-section { grid-template-columns: 1fr; padding-block: 15px 42px; gap: 29px; }
    .story-copy h2 { font-size: 31px; margin-top: 12px; }
    .story-details summary { min-height: 49px; }
    .start-section { flex-direction: column; align-items: flex-start; gap: 20px; padding-block: 35px; }
    .start-actions { flex-wrap: wrap; flex-direction: row; }
    .footer-main > div { flex-wrap: wrap; gap: 12px; }
    .screenshot-dialog { width: calc(100vw - 16px); max-height: calc(100dvh - 20px); }
    .dialog-top { padding: 10px; gap: 10px; }
    .dialog-top h2 { font-size: 12px; }
    .dialog-top > span { display: none; }
    .dialog-stage { position: relative; display: block; padding: 0; }
    .dialog-image { height: 55dvh; }
    .dialog-stage button { position: absolute; top: calc(50% - 22px); z-index: 1; }
    [data-previous-capture] { left: 7px; }
    [data-next-capture] { right: 7px; }
    .dialog-authenticity { font-size: 10px; }
    .dialog-footer { flex-wrap: wrap; gap: 8px 12px; }
    [data-capture-counter] { margin-left: auto; }
    .steps, .references { grid-template-columns: 1fr; gap: 24px; }
    .manual { padding: 18px; }
    .manual strong { font-size: 22px; }
    .docs-hero { padding: 44px 0 28px; }
    .docs-hero h1 { font-size: 38px; }
    .tabs { gap: 20px; font-size: 12px; }
}
@media (max-width: 360px) {
    .wrap { width: calc(100% - 28px); }
    h1 { font-size: 41px; }
    .main-navigation { gap: 18px; }
    .capture-tabs > label .icon { display: none; }
}
@media (pointer: coarse) { .button, .icon-button, .main-navigation a, .text-link, .languages summary, .language-list a { min-height: 44px; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }
@media (forced-colors: active) { .glass, .button, .language-list { background: Canvas; color: CanvasText; } .capture-choice:checked + label { outline: 1px solid Highlight; } }