:root,
html[data-theme="dark"] {
  color-scheme: dark;
  --sd-bg: #07070a;
  --sd-bg-elevated: #0c0c10;
  --sd-surface-1: #101015;
  --sd-surface-2: #15151b;
  --sd-surface-3: #1b1b22;
  --sd-contrast-rgb: 255 255 255;
  --sd-line: rgb(var(--sd-contrast-rgb) / 0.08);
  --sd-line-strong: rgb(var(--sd-contrast-rgb) / 0.14);
  --sd-panel: rgb(var(--sd-contrast-rgb) / 0.025);
  --sd-panel-hover: rgb(var(--sd-contrast-rgb) / 0.055);
  --sd-text: #f8f8fa;
  --sd-text-soft: #d4d4da;
  --sd-muted: #8b8b96;
  --sd-muted-strong: #a7a7b0;
  --sd-accent-rgb: 76 141 255;
  --sd-accent: #4c8dff;
  --sd-accent-hover: #6ca2ff;
  --sd-accent-soft: rgb(var(--sd-accent-rgb) / 0.14);
  --sd-on-accent: #ffffff;
  --sd-info: #60a5fa;
  --sd-success: #4ade80;
  --sd-warning: #fbbf24;
  --sd-danger: #f87171;
  --sd-nav-bg: rgba(7, 7, 10, 0.94);
  --sd-glass-bg: rgba(9, 9, 12, 0.84);
  --sd-theme-control-bg: rgba(15, 15, 20, 0.62);
  --sd-radius-sm: 10px;
  --sd-radius-md: 14px;
  --sd-radius-lg: 20px;
  --sd-radius-xl: 28px;
  --sd-sidebar: 236px;
  --sd-admin-sidebar: 248px;
  --sd-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

html[data-theme="light"] {
  color-scheme: light;
  --sd-bg: #f6f7fb;
  --sd-bg-elevated: #ffffff;
  --sd-surface-1: #ffffff;
  --sd-surface-2: #f0f2f7;
  --sd-surface-3: #e8ebf2;
  --sd-contrast-rgb: 17 24 39;
  --sd-line: rgb(var(--sd-contrast-rgb) / 0.09);
  --sd-line-strong: rgb(var(--sd-contrast-rgb) / 0.15);
  --sd-panel: rgb(var(--sd-contrast-rgb) / 0.025);
  --sd-panel-hover: rgb(var(--sd-contrast-rgb) / 0.05);
  --sd-text: #12151c;
  --sd-text-soft: #343a46;
  --sd-muted: #737b89;
  --sd-muted-strong: #596170;
  --sd-accent-rgb: 37 99 235;
  --sd-accent: #2563eb;
  --sd-accent-hover: #1d4ed8;
  --sd-accent-soft: rgb(var(--sd-accent-rgb) / 0.11);
  --sd-on-accent: #ffffff;
  --sd-info: #2563eb;
  --sd-success: #15803d;
  --sd-warning: #a16207;
  --sd-danger: #dc2626;
  --sd-nav-bg: rgba(249, 250, 253, 0.94);
  --sd-glass-bg: rgba(255, 255, 255, 0.84);
  --sd-theme-control-bg: rgba(255, 255, 255, 0.7);
  --sd-shadow: 0 22px 70px rgba(29, 43, 68, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  background: var(--sd-bg);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--sd-text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background:
    radial-gradient(circle at 80% -10%, rgb(var(--sd-accent-rgb) / 0.08), transparent 26rem),
    radial-gradient(circle at 8% 105%, rgba(70, 110, 220, 0.07), transparent 30rem),
    var(--sd-bg);
  text-rendering: optimizeLegibility;
}

button,
input,
textarea,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

img,
video {
  max-width: 100%;
}

::selection {
  background: rgb(var(--sd-accent-rgb) / 0.28);
}

:focus-visible {
  outline: 2px solid rgb(var(--sd-accent-rgb) / 0.9);
  outline-offset: 3px;
}

.sd-brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
}

.sd-brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, #5f9cff, #2563eb);
  box-shadow: 0 10px 30px rgb(var(--sd-accent-rgb) / 0.22);
  font-size: 15px;
  font-weight: 950;
}

.sd-brand-copy {
  display: grid;
  min-width: 0;
  gap: 1px;
}

.sd-brand-copy strong {
  overflow: hidden;
  font-size: 15px;
  letter-spacing: -0.025em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sd-brand-copy small {
  color: var(--sd-muted);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sd-brand.is-compact .sd-brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  font-size: 13px;
}

.sd-brand.is-compact .sd-brand-copy strong {
  font-size: 14px;
}

.sd-eyebrow {
  color: var(--sd-accent);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.sd-page-intro {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--sd-line);
}

.sd-page-intro h1 {
  margin: 6px 0 0;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1;
  letter-spacing: -0.045em;
}

.sd-page-intro p {
  max-width: 720px;
  margin: 10px 0 0;
  color: var(--sd-muted);
  font-size: 13px;
  line-height: 1.6;
}

.sd-page-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.sd-button,
.sd-icon-button {
  border: 1px solid var(--sd-line-strong);
  background: rgb(var(--sd-contrast-rgb) / 0.04);
  color: var(--sd-text);
  cursor: pointer;
  transition: background 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.sd-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 0 15px;
  font-size: 11px;
  font-weight: 800;
}

.sd-button.is-primary {
  border-color: transparent;
  background: var(--sd-accent);
}

.sd-button:hover,
.sd-icon-button:hover {
  border-color: rgb(var(--sd-contrast-rgb) / 0.22);
  background: rgb(var(--sd-contrast-rgb) / 0.075);
}

.sd-button.is-primary:hover {
  background: var(--sd-accent-hover);
}

.sd-button:active,
.sd-icon-button:active {
  transform: translateY(1px);
}

.sd-button:disabled,
.sd-icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.sd-icon-button {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 12px;
}

.sd-status-pill {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--sd-line);
  border-radius: 999px;
  padding: 6px 9px;
  color: var(--sd-muted-strong);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sd-status-pill.is-success { color: var(--sd-success); border-color: rgba(74, 222, 128, 0.22); }
.sd-status-pill.is-warning { color: var(--sd-warning); border-color: rgba(251, 191, 36, 0.24); }
.sd-status-pill.is-danger { color: var(--sd-danger); border-color: rgba(248, 113, 113, 0.24); }
.sd-status-pill.is-info { color: var(--sd-info); border-color: rgba(96, 165, 250, 0.24); }

.sd-empty-state {
  display: grid;
  gap: 5px;
  border: 1px solid var(--sd-line);
  border-radius: var(--sd-radius-md);
  background: var(--sd-panel);
  padding: 18px;
}

.sd-empty-state span {
  color: var(--sd-muted);
  font-size: 12px;
}

@media (max-width: 720px) {
  .sd-page-intro {
    display: grid;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

.sd-system-state {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--sd-bg);
  text-align: center;
}

.sd-system-state > div {
  width: min(520px, 100%);
}

.sd-system-state h1 {
  margin: 10px 0;
  font-size: clamp(34px, 7vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.sd-system-state p {
  margin: 0 0 22px;
  color: var(--sd-muted);
  line-height: 1.6;
}

/* UX005 — final product polish */
.sd-skip-link {
  position: fixed;
  z-index: 999;
  top: 10px;
  left: 10px;
  transform: translateY(-180%);
  border: 1px solid var(--sd-line-strong);
  border-radius: 10px;
  background: var(--sd-bg-elevated);
  color: var(--sd-text);
  padding: 10px 13px;
  font-size: 11px;
  font-weight: 850;
  box-shadow: var(--sd-shadow);
  transition: transform 120ms ease;
}

.sd-skip-link:focus {
  transform: translateY(0);
}

.sd-media-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

:where(h1, h2, h3, strong, p, span, small) {
  overflow-wrap: anywhere;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (forced-colors: active) {
  .sd-button,
  .sd-icon-button,
  .sd-status-pill {
    border: 1px solid ButtonText;
  }
}


/* THEME001 — shared public/admin appearance control */
.sd-theme-toggle {
  display: grid;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--sd-line);
  border-radius: 999px;
  background: var(--sd-theme-control-bg);
  color: var(--sd-text-soft);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  opacity: 0.78;
  cursor: pointer;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: opacity 140ms ease, transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.sd-theme-toggle:hover,
.sd-theme-toggle:focus-visible {
  opacity: 1;
  border-color: var(--sd-line-strong);
  background: var(--sd-bg-elevated);
}

.sd-theme-toggle:active {
  transform: scale(0.96);
}

.sd-theme-icon { display: none; }
html[data-theme="dark"] .sd-theme-icon-to-light { display: block; }
html[data-theme="light"] .sd-theme-icon-to-dark { display: block; }

html[data-theme="light"] body {
  background:
    radial-gradient(circle at 80% -10%, rgb(var(--sd-accent-rgb) / 0.07), transparent 25rem),
    radial-gradient(circle at 8% 105%, rgba(78, 116, 206, 0.05), transparent 30rem),
    var(--sd-bg);
}

/* BRANDING002 — uploaded logo support without changing existing brand geometry. */
.sd-brand-mark.has-image {
  overflow: hidden;
  padding: 4px;
  background: rgb(var(--sd-contrast-rgb) / 0.04);
  border: 1px solid var(--sd-line);
}

.sd-brand-mark.has-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}