:root {
  color-scheme: light;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 14px;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --canvas: #f3eee4;
  --surface: #faf7f0;
  --surface-raised: #fffdf8;
  --ink: #382c22;
  --muted: #76675a;
  --line: #d8cab7;
  --accent: #835b3d;
  --accent-hover: #6d472f;
  --accent-soft: #e8dccb;
  --accent-ink: #fffaf2;
  --glass: rgb(237 230 219 / 82%);
  --shadow: 0 10px 28px rgb(56 44 34 / 12%);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --header-height: 60px;
  --nav-height: 48px;
  --footer-height: 42px;
  --radius-sm: 4px;
  --radius-md: 6px;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #211a15;
  --surface: #2d241e;
  --surface-raised: #372b23;
  --ink: #f0e6d7;
  --muted: #bda98f;
  --line: #514033;
  --accent: #c79a70;
  --accent-hover: #dfb58e;
  --accent-soft: #453528;
  --accent-ink: #211a15;
  --glass: rgb(52 41 31 / 90%);
  --shadow: 0 12px 32px rgb(0 0 0 / 28%);
}
* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { color: var(--ink); background: var(--canvas); -webkit-font-smoothing: antialiased; }
button, input, select { color: inherit; font: inherit; }
button, a, input, select { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
.app-shell { display: grid; grid-template-rows: var(--header-height) auto minmax(0, 1fr) var(--footer-height); width: 100%; height: 100vh; height: 100dvh; min-height: 0; overflow: hidden; padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); background: var(--canvas); }
.skip-link { position: fixed; z-index: 20; top: 8px; left: 8px; padding: var(--space-2) var(--space-3); color: var(--accent-ink); background: var(--accent); transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.topbar { display: flex; align-items: center; justify-content: space-between; min-width: 0; padding: 0 var(--space-5); border-bottom: 1px solid var(--line); background: var(--surface); }
.brand { font-size: 21px; font-weight: 700; letter-spacing: -.8px; }
.brand span { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.icon-button { display: inline-grid; place-items: center; width: 34px; height: 34px; padding: 0; border: 1px solid var(--line); border-radius: var(--radius-sm); color: var(--ink); background: transparent; }
.icon-button svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.theme-sun, :root[data-theme="dark"] .theme-moon { display: none; }
:root[data-theme="dark"] .theme-sun { display: block; }
.settings-link { padding: var(--space-2) var(--space-3); border: 1px solid transparent; color: var(--muted); font-size: 12px; }
.settings-link:hover, .settings-link.active { border-color: var(--line); color: var(--ink); background: var(--canvas); }
.logout-form { margin: 0; }
.logout-button { background: transparent; }
.login-page { display: grid; place-items: center; padding: var(--space-5); }
.login-card { width: min(360px, 100%); padding: var(--space-6); border: 1px solid var(--line); background: var(--surface); }
.login-card h1 { margin: 0; color: var(--ink); font-size: 24px; font-weight: 700; letter-spacing: -.7px; }
.login-subtitle { margin: var(--space-1) 0 var(--space-5); color: var(--muted); font-size: 12px; }
.login-form { display: grid; gap: var(--space-3); }
.login-form label { display: grid; gap: var(--space-1); color: var(--muted); font-size: 11px; }
.login-form .button { width: 100%; margin-top: var(--space-1); }
.login-error { min-height: 1em; margin: 0; color: #9a4032; font-size: 11px; }
:root[data-theme="dark"] .login-error { color: #f0a696; }
.login-unavailable { margin: var(--space-5) 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.login-theme-toggle { position: fixed; top: var(--space-4); right: var(--space-4); }
.category-nav { position: relative; z-index: 5; display: flex; align-items: center; gap: var(--space-1); min-width: 0; min-height: var(--nav-height); padding: 0 var(--space-5); border-bottom: 1px solid var(--line); background: var(--canvas); overflow-x: auto; scrollbar-width: none; }
.category-nav::-webkit-scrollbar { display: none; }
.category-group { position: relative; display: flex; align-items: stretch; align-self: stretch; flex: 0 0 auto; }
.category-trigger { display: inline-flex; align-items: center; gap: var(--space-2); flex: 0 0 auto; height: 100%; padding: 0 var(--space-3); border: 0; border-bottom: 2px solid transparent; color: var(--muted); background: transparent; font-size: 12px; white-space: nowrap; }
.category-trigger:hover, .category-trigger[aria-expanded="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.category-trigger svg { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 1.7; transition: transform 220ms ease; }
.category-trigger[aria-expanded="true"] svg { transform: rotate(180deg); }
.category-dropdown { position: fixed; z-index: 8; min-width: 210px; max-width: min(320px, calc(100vw - 24px)); padding: var(--space-1); border: 1px solid var(--accent); border-radius: var(--radius-sm); background: var(--glass); box-shadow: var(--shadow); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); opacity: 0; transform: translateY(-7px); visibility: hidden; transition: opacity 220ms ease, transform 220ms ease, visibility 220ms; }
.category-dropdown.open { opacity: 1; transform: translateY(0); visibility: visible; }
.category-option { display: block; width: 100%; padding: 10px 12px; border: 0; border-radius: 2px; color: var(--ink); background: transparent; text-align: left; font-size: 12px; }
.category-option:hover, .category-option:focus-visible { background: var(--accent-soft); }
.nav-empty { padding: 0 var(--space-3); color: var(--muted); font-size: 11px; }
.main-content { display: flex; min-width: 0; min-height: 0; overflow: hidden; }
.viewer-stage { display: grid; place-items: center; flex: 1; min-width: 0; min-height: 0; padding: var(--space-5); }
.viewer-frame { position: relative; width: min(100%, calc((100dvh - 190px) * 16 / 9)); max-height: calc(100dvh - 190px); aspect-ratio: 16 / 9; overflow: hidden; background: #17110e; color: #f0e6d7; touch-action: none; user-select: none; -webkit-user-select: none; }
.viewer-frame img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: 0; transition: opacity 180ms ease; }
.viewer-frame img.visible { opacity: 1; }
.viewer-empty, .viewer-error { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: var(--space-3); padding: var(--space-5); color: #e8dccb; text-align: center; font-size: 13px; }
.viewer-empty p { margin: 0; }
.empty-rule { width: 28px; height: 1px; background: var(--accent); }
.viewer-error { color: #f0b9a9; }
.slide-count { position: absolute; right: var(--space-3); bottom: var(--space-3); min-width: 54px; padding: 6px 9px; color: #fffaf2; background: rgb(30 23 18 / 72%); text-align: center; font-size: 11px; font-variant-numeric: tabular-nums; }
.footer { display: flex; align-items: center; justify-content: space-between; min-width: 0; padding: 0 var(--space-5); border-top: 1px solid var(--line); color: var(--muted); background: var(--surface); font-size: 11px; }
.footer a { color: var(--ink); font-size: 13px; font-weight: 700; }
.settings-scroll { width: min(880px, 100%); height: 100%; margin: 0 auto; padding: var(--space-5); overflow-y: auto; overscroll-behavior: contain; }
.settings-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-5); }
.settings-heading h1 { margin: 0; font-size: 24px; font-weight: 600; letter-spacing: -.6px; }
.settings-message { margin: calc(-1 * var(--space-3)) 0 var(--space-3); }
.eyebrow { margin: 0 0 var(--space-1); color: var(--accent); font-size: 10px; font-weight: 650; letter-spacing: 1.4px; }
.settings-section { margin-bottom: var(--space-4); padding: var(--space-4); border: 1px solid var(--line); background: var(--surface); }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-3); }
.section-heading h2 { margin: 0; font-size: 15px; font-weight: 600; }
.section-heading p { margin: var(--space-1) 0 0; color: var(--muted); font-size: 11px; line-height: 1.5; }
.appearance-control { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); font-size: 12px; }
.theme-options { display: inline-flex; gap: 2px; padding: 2px; border: 1px solid var(--line); background: var(--canvas); }
.theme-options button { min-width: 64px; padding: 6px 10px; border: 0; color: var(--muted); background: transparent; font-size: 11px; }
.theme-options button[aria-pressed="true"] { color: var(--accent-ink); background: var(--accent); }
.inline-form { display: grid; grid-template-columns: minmax(150px, 1fr) minmax(150px, .8fr) auto; align-items: end; gap: var(--space-3); margin-bottom: var(--space-3); }
.inline-form label, .slide-set-picker, .upload-form label { display: grid; gap: var(--space-1); color: var(--muted); font-size: 11px; }
input:not([type="file"]), select { width: 100%; min-width: 0; height: 36px; padding: 0 10px; border: 1px solid var(--line); border-radius: var(--radius-sm); color: var(--ink); background: var(--surface-raised); font-size: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 34px; padding: 0 12px; border: 1px solid var(--line); border-radius: var(--radius-sm); color: var(--ink); background: var(--surface-raised); font-size: 11px; font-weight: 550; white-space: nowrap; }
.button:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.button.primary { border-color: var(--accent); color: var(--accent-ink); background: var(--accent); }
.button.primary:hover:not(:disabled) { background: var(--accent-hover); }
.button.danger { color: #9a4032; }
:root[data-theme="dark"] .button.danger { color: #f0a696; }
.button:disabled { opacity: .45; cursor: not-allowed; }
.category-management-list, .slide-management-list { display: grid; gap: var(--space-2); }
.managed-category { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: var(--space-3); padding: var(--space-2) 0; border-top: 1px solid var(--line); }
.managed-category-name { min-width: 0; overflow-wrap: anywhere; font-size: 12px; }
.managed-category-name.child { padding-left: var(--space-4); color: var(--muted); }
.managed-category-actions { display: flex; align-items: center; gap: var(--space-1); }
.slide-set-picker { max-width: 360px; margin-bottom: var(--space-3); }
.upload-form { display: flex; align-items: end; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-3); }
.upload-form input[type="file"] { max-width: 100%; color: var(--muted); font-size: 11px; }
.form-message { flex-basis: 100%; min-height: 1em; margin: 0; color: var(--muted); font-size: 11px; }
.form-message[data-state="error"] { color: #9a4032; }
:root[data-theme="dark"] .form-message[data-state="error"] { color: #f0a696; }
.slide-row { display: grid; grid-template-columns: 108px minmax(0, 1fr) auto; align-items: center; gap: var(--space-3); padding: var(--space-2) 0; border-top: 1px solid var(--line); }
.slide-row img { display: block; width: 108px; aspect-ratio: 16 / 9; object-fit: cover; background: var(--canvas); }
.slide-meta { color: var(--muted); font-size: 10px; line-height: 1.6; }
.slide-actions { display: flex; gap: var(--space-1); }
.storage-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-2); margin: 0; }
.storage-stats > div { padding: var(--space-2); border: 1px solid var(--line); }
.storage-stats dt { color: var(--muted); font-size: 10px; }
.storage-stats dd { margin: var(--space-1) 0 0; font-size: 13px; font-weight: 600; }
.empty-state { padding: var(--space-4); color: var(--muted); font-size: 11px; }
@media (max-width: 600px) {
  :root { --header-height: 54px; --nav-height: 44px; --footer-height: 38px; --space-5: 16px; }
  .topbar { padding-inline: var(--space-3); }
  .category-nav { padding-inline: var(--space-2); }
  .category-trigger { padding-inline: var(--space-2); }
  .viewer-stage { padding: var(--space-2); }
  .viewer-frame { width: min(100%, calc((100dvh - 150px) * 16 / 9)); max-height: calc(100dvh - 150px); }
  .settings-scroll { padding: var(--space-3); }
  .inline-form { grid-template-columns: 1fr 1fr; }
  .inline-form .button { grid-column: 1 / -1; justify-self: start; }
  .slide-row { grid-template-columns: 82px minmax(0, 1fr); }
  .slide-row img { width: 82px; }
  .slide-actions { grid-column: 1 / -1; justify-content: flex-end; }
  .storage-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}