* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; background: var(--canvas); color: var(--text-primary); font: var(--weight-regular) var(--text-base)/var(--leading-body) var(--font-ui); }
::selection { background: var(--accent-hyper-cyan); color: var(--on-accent); }
a { color: var(--interactive); text-decoration-thickness: 1px; text-underline-offset: .22em; }
a:hover { color: var(--interactive-hover); }
button, input, select, textarea { font: inherit; }
button, select { color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; }
button:disabled, input:disabled, select:disabled, textarea:disabled { opacity: .6; cursor: not-allowed; }
code, pre, kbd, samp { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
pre { max-width: 100%; overflow-x: auto; padding: var(--space-4); background: var(--surface-raised); border-inline-start: var(--line-width-strong) solid var(--accent-hyper-cyan); direction: ltr; text-align: left; }
img, video, iframe { max-width: 100%; }
hr { border: 0; border-top: var(--line-width) solid var(--border); }

.site-header, .site-footer, .page-content, .site-messages { width: min(var(--content-width), calc(100% - 40px)); margin-inline: auto; }
.site-header { position: relative; display: grid; grid-template-columns: minmax(150px, 220px) minmax(0, 1fr); align-items: center; gap: var(--space-5); min-height: 88px; padding: var(--space-3) 0 var(--space-3) 56px; border-bottom: var(--line-width-strong) solid var(--border); }
.site-header::after { position: absolute; inset-inline-end: 0; bottom: calc(-1 * var(--line-width-strong)); width: 72px; height: var(--line-width-strong); background: var(--accent-hyper-cyan); content: ""; }
.brand { display: inline-grid; justify-items: start; align-content: center; gap: 2px; color: var(--text-primary); text-decoration: none; }
.brand-name, .footer-brand { font: var(--weight-heavy) 1.9rem/1 var(--font-mono); letter-spacing: -.09em; }
.brand-note, .footer-note { color: var(--text-subtle); font: var(--weight-medium) var(--text-xs)/1.4 var(--font-mono); letter-spacing: .045em; }
.site-nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-start; gap: var(--space-1) var(--space-4); min-width: 0; padding-left: var(--space-5); }
.site-nav > a, .header-logout-form button { display: inline-flex; align-items: center; min-height: 34px; color: var(--text-secondary); text-decoration: none; font-size: var(--text-sm); }
.site-nav > a:hover, .header-logout-form button:hover { color: var(--interactive); }
.site-nav .nav-register { padding-inline: var(--space-2); border-inline-start: var(--line-width-strong) solid var(--accent-acid-lime); color: var(--text-primary); }
.header-logout-form { display: inline-flex; margin: 0; }
.header-logout-form button { padding: 0; border: 0; background: transparent; cursor: pointer; }
.theme-toggle { position: absolute; z-index: 2; top: 10px; left: 0; display: grid; width: 40px; height: 40px; place-items: center; border: var(--line-width) solid var(--border-strong); background: var(--surface); color: var(--text-primary); cursor: pointer; transition: border-color var(--transition-fast), background-color var(--transition-fast); }
.theme-toggle:hover { border-color: var(--focus-ring); background: var(--surface-raised); }
.theme-toggle:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; }
.notification-menu { position: absolute; z-index: 4; top: 10px; left: 50px; }
.notification-bell { position: relative; display: grid; width: 40px; height: 40px; place-items: center; border: var(--line-width) solid var(--border-strong); background: var(--surface); color: var(--text-primary); cursor: pointer; list-style: none; }
.notification-bell::-webkit-details-marker { display: none; }
.notification-bell::marker { content: ""; }
.notification-bell svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: square; stroke-linejoin: miter; }
.notification-badge { position: absolute; top: -6px; right: -6px; display: grid; min-width: 18px; height: 18px; place-items: center; padding-inline: 4px; border-radius: 9px; background: var(--state-danger); color: var(--text-inverse); font: var(--weight-bold) 10px/1 var(--font-mono); }
.notification-popover { position: absolute; top: 46px; left: 0; width: min(340px, calc(100vw - 28px)); padding: var(--space-3); border: var(--line-width-strong) solid var(--border-strong); background: var(--surface); box-shadow: var(--shadow-card); }
.notification-popover h2 { margin: 0 0 var(--space-2); font-size: var(--text-base); }
.notification-popover ul { display: grid; gap: var(--space-2); margin: 0; padding: 0; list-style: none; }
.notification-popover li { display: grid; gap: var(--space-1); padding: var(--space-2); border-inline-start: var(--line-width) solid var(--border); }
.notification-popover li.is-unread { border-inline-start: var(--line-width-strong) solid var(--interactive); }
.notification-popover li strong { font-size: var(--text-sm); }
.notification-popover li p, .notification-popover > p { margin: 0; color: var(--text-secondary); font-size: var(--text-xs); overflow-wrap: anywhere; }
.notification-kind { color: var(--interactive); font-size: var(--text-xs); }
.notification-auth-note { padding-top: var(--space-2); }
.notification-popover > a { display: inline-block; margin-top: var(--space-3); font-size: var(--text-sm); }
.light-theme-message { position: absolute; z-index: 3; top: 54px; left: 0; width: min(260px, calc(100vw - 28px)); padding: var(--space-2) var(--space-3); border: var(--line-width) solid var(--border-strong); background: var(--surface); color: var(--text-primary); box-shadow: var(--shadow-card); }
.light-theme-message[hidden] { display: none; }
.light-theme-message p { margin: 0 0 var(--space-1); font-size: var(--text-xs); }
.light-theme-message button { padding: 0; border: 0; background: transparent; color: var(--interactive); font-size: var(--text-xs); text-decoration: underline; text-underline-offset: .2em; cursor: pointer; }
.light-theme-message button:focus-visible, .notification-bell:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; }
.theme-icon { display: none; width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: square; stroke-linejoin: miter; }
:root[data-theme="dark"] .theme-icon--sun, :root[data-theme="light"] .theme-icon--moon { display: block; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.page-content { min-height: 65vh; }
.page-heading { margin: 0 0 var(--space-2); font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: var(--weight-heavy); line-height: var(--leading-heading); letter-spacing: -.035em; overflow-wrap: anywhere; }
.page-description { max-width: 68ch; margin: 0 0 var(--space-6); color: var(--text-secondary); font-size: var(--text-lg); }
.eyebrow, .technical-label { display: flex; align-items: center; gap: var(--space-2); margin: 0 0 var(--space-3); color: var(--interactive); font: var(--weight-medium) var(--text-xs)/1.5 var(--font-mono); letter-spacing: .025em; }
.status-mark { flex: 0 0 8px; width: 8px; height: 8px; background: var(--state-success); }
.button-primary, .button-secondary { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: var(--space-2) var(--space-4); border: var(--line-width-strong) solid var(--interactive); border-radius: var(--radius-control); font: var(--weight-bold) var(--text-base)/1.4 var(--font-ui); text-decoration: none; cursor: pointer; transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast); }
.button-primary { background: var(--interactive); color: var(--on-accent); }
.button-primary:hover { border-color: var(--interactive-hover); background: var(--interactive-hover); color: var(--text-inverse); }
.button-secondary { background: transparent; color: var(--interactive); }
.button-secondary:hover { background: var(--surface-accent); color: var(--text-primary); }
.button-secondary[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.site-messages { margin-top: var(--space-4); }
.site-message { margin: 0 0 var(--space-2); padding: var(--space-3) var(--space-4); border: var(--line-width) solid var(--border); border-inline-start: var(--line-width-strong) solid var(--interactive); background: var(--surface); overflow-wrap: anywhere; }
.site-message--error { border-inline-start-color: var(--state-danger); background: var(--surface-danger); color: var(--state-danger); }
.site-message--success { border-inline-start-color: var(--state-success); background: var(--surface-success); color: var(--state-success); }
.site-message--warning { border-inline-start-color: var(--state-warning); background: var(--surface-warning); color: var(--state-warning); }
.site-footer { display: flex; align-items: baseline; gap: var(--space-4); min-height: 76px; margin-top: var(--space-7); padding: var(--space-4) 0; border-top: var(--line-width) solid var(--border); color: var(--text-secondary); }
.site-footer a { margin-inline-start: auto; font-size: var(--text-sm); }
.footer-brand { color: var(--text-primary); font-size: var(--text-lg); }

@media (max-width: 900px) {
  .site-header { grid-template-columns: minmax(130px, 180px) minmax(0, 1fr); gap: var(--space-3); }
  .site-nav { gap: var(--space-1) var(--space-3); }
}
@media (max-width: 700px) {
  .site-header, .site-footer, .page-content, .site-messages { width: min(calc(100% - 28px), 600px); }
  .site-header { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); padding: 58px 0 var(--space-3); }
  .brand { grid-row: 1; }
  .site-nav { grid-row: 2; padding-left: 0; }
  .theme-toggle { top: 8px; }
  .notification-menu { top: 8px; }
  .notification-popover { left: auto; right: 0; }
  .light-theme-message { top: 54px; left: 0; }
  .page-description { font-size: var(--text-base); }
  .site-footer { flex-wrap: wrap; gap: var(--space-2) var(--space-3); }
}
@media (max-width: 420px) {
  .site-nav { column-gap: var(--space-3); }
  .site-nav > a, .header-logout-form button { font-size: var(--text-xs); }
  .site-footer a { margin-inline-start: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}