:root {
  --surface-page: #060b13;
  --surface-card: #0d1929;
  --surface-card-raised: #111f31;
  --surface-inset: #07111e;
  --surface-control: #091522;
  --border-default: #263b55;
  --border-strong: #31577b;
  --radius-control: 12px;
  --radius-inner: 14px;
  --radius-card: 18px;
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 18px;
  --space-5: 24px;
  --shadow-card: 0 18px 50px rgba(0, 0, 0, .28);
  --shadow-control: 0 9px 22px rgba(0, 0, 0, .2);
  --focus-ring: 0 0 0 3px rgba(27, 167, 255, .18);
  --youtube-red: #ff0033;
  --youtube-red-dark: #c80028;
  --youtube-red-light: #ff6b88;
}

html {
  color-scheme: dark;
}

body {
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  color: var(--text);
  line-height: 1.2;
  letter-spacing: -.018em;
  text-wrap: balance;
}

h1 {
  font-weight: 900;
}

h2 {
  font-size: clamp(1.45rem, 2.2vw, 1.8rem);
}

h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.15rem;
}

h4 {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
}

.eyebrow {
  margin-bottom: var(--space-1);
  color: #55bdff;
  line-height: 1.25;
}

.panel,
.stat,
.plan-card,
.admin-card,
.admin-access-panel,
.admin-activity-panel,
.admin-cost-panel {
  border-color: var(--border-default);
  border-radius: var(--radius-card);
  background: linear-gradient(145deg, rgba(17, 31, 49, .98), rgba(8, 17, 29, .98));
  box-shadow: var(--shadow-card);
}

.history-item,
.thumbnail-card,
.finished-thumbnail-card,
.feedback-admin-card,
.brand-step,
.brand-starter-grid article,
.help-steps li,
.help-info-card,
.help-upload-card,
.help-example,
.help-fix-grid section,
.admin-access-row,
.admin-fact,
.admin-cost-row,
.asset-item {
  border-color: var(--border-default);
  border-radius: var(--radius-inner);
  background: var(--surface-inset);
}

.feedback-sheet,
.welcome-tour-sheet,
.work-progress-sheet,
.admin-learning-reset-sheet {
  border-color: var(--border-strong);
  border-radius: 20px;
  background-color: var(--surface-card);
  box-shadow: 0 30px 90px rgba(0, 0, 0, .64);
}

label {
  gap: 8px;
  color: #a9bdd6;
  line-height: 1.35;
}

label > small,
label small {
  color: var(--muted);
  font-size: .8rem;
  font-weight: 500;
  line-height: 1.4;
}

input,
textarea,
select {
  border-color: var(--border-default);
  border-radius: var(--radius-control);
  background: var(--surface-control);
  color: var(--text);
  transition: border-color .16s ease, box-shadow .16s ease, background .16s ease;
}

input:not([type="checkbox"]):not([type="radio"]),
select {
  min-height: 48px;
}

textarea {
  padding: 13px 14px;
  line-height: 1.55;
}

input::placeholder,
textarea::placeholder {
  color: #7288a3;
  opacity: 1;
}

input:hover,
textarea:hover,
select:hover {
  border-color: #385a7c;
}

button,
.button {
  min-height: 44px;
  border-color: var(--border-default);
  border-radius: var(--radius-control);
  padding: 10px 16px;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
  box-shadow: var(--shadow-control);
  transition: border-color .16s ease, background .16s ease, color .16s ease, transform .16s ease, box-shadow .16s ease;
}

button:not(:disabled):not(.feedback-backdrop):not(.mobile-menu-backdrop):not(.welcome-tour-backdrop):hover,
.button:not([aria-disabled="true"]):hover {
  border-color: #3c6a93;
  background-color: #213653;
  color: #fff;
  transform: translateY(-1px);
}

button.primary,
.button.primary {
  border-color: #38b5ff;
  background: linear-gradient(135deg, #087fd1, #25adff);
  box-shadow: 0 12px 28px rgba(0, 140, 255, .22);
}

button.primary:not(:disabled):hover,
.button.primary:not([aria-disabled="true"]):hover {
  border-color: #72cbff;
  background: linear-gradient(135deg, #1195eb, #36b8ff);
  box-shadow: 0 14px 32px rgba(0, 140, 255, .3);
}

button.youtube-action,
.button.youtube-action {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border-color: #ff4266;
  background: linear-gradient(135deg, var(--youtube-red), var(--youtube-red-dark));
  color: #fff;
  box-shadow: 0 12px 28px rgba(255, 0, 51, .22);
}

/* YouTube action controls stay text-only so custom play shapes cannot be
   mistaken for altered YouTube branding. Busy state uses a neutral spinner. */

button.youtube-action:not(:disabled):not([aria-disabled="true"]):hover,
.button.youtube-action:not([aria-disabled="true"]):hover {
  border-color: #ff8ba2;
  background: linear-gradient(135deg, #ff204d, #e0002d);
  color: #fff;
  box-shadow: 0 14px 32px rgba(255, 0, 51, .3);
}

.youtube-status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.youtube-status-card {
  position: relative;
  min-width: 0;
  min-height: 154px;
  overflow: hidden;
  padding: 22px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  background: linear-gradient(145deg, rgba(17, 31, 49, .98), rgba(8, 17, 29, .98));
  box-shadow: var(--shadow-card);
}

.youtube-status-card::before {
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--youtube-red), rgba(255, 0, 51, .08));
  content: "";
}

.youtube-status-card span,
.youtube-status-card strong,
.youtube-status-card small {
  display: block;
  overflow-wrap: anywhere;
}

.youtube-status-card span {
  color: var(--youtube-red-light);
  font-size: .74rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.youtube-status-card strong {
  margin: 9px 0 7px;
  color: var(--text);
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  line-height: 1.18;
}

.youtube-status-card strong.connected-status {
  color: #75efb9;
}

.youtube-status-card small {
  color: var(--muted);
  line-height: 1.45;
}

@media (max-width: 900px) {
  .youtube-status-grid {
    grid-template-columns: 1fr;
  }

  .youtube-status-card {
    min-height: 0;
    padding: 19px;
  }
}

button.youtube-action:focus-visible,
.button.youtube-action:focus-visible {
  border-color: var(--youtube-red-light);
  box-shadow: 0 0 0 3px rgba(255, 0, 51, .24), 0 12px 28px rgba(255, 0, 51, .22);
}

button.youtube-action:disabled,
button.youtube-action[aria-disabled="true"],
.button.youtube-action[aria-disabled="true"] {
  border-color: #7c3141;
  background: linear-gradient(135deg, #7c2638, #5c202c);
  color: #e8b7c1;
  opacity: .72;
}

button.youtube-action[aria-busy="true"]::before,
.button.youtube-action[aria-busy="true"]::before {
  width: 13px;
  content: "";
  height: 13px;
  border: 2px solid rgba(255, 255, 255, .45);
  border-top-color: #fff;
  border-radius: 50%;
  animation: youtube-action-spin .7s linear infinite;
}

button.youtube-action[aria-busy="true"]::after,
.button.youtube-action[aria-busy="true"]::after {
  content: "" !important;
}

@keyframes youtube-action-spin {
  to { transform: rotate(360deg); }
}

button:disabled,
.button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: .6;
  transform: none;
  box-shadow: none;
}

button:focus-visible,
.button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[contenteditable="true"]:focus-visible {
  border-color: var(--blue);
  outline: none;
  box-shadow: var(--focus-ring);
}

.actions,
.text-actions,
.brand-wizard-actions,
.admin-actions {
  gap: var(--space-2);
}

.actions > button,
.actions > .button,
.actions > a.button {
  display: inline-flex;
}

.output {
  border-color: var(--border-default);
  border-radius: var(--radius-control);
  background: #050d17;
}

.pill,
.chips span,
.admin-status,
.brand-optional {
  border-color: var(--border-default);
  background: #101f31;
}

.notice-toast,
.automatic-note,
.youtube-sync-reminder,
.help-first-sync,
.help-note,
.feedback-context,
.feedback-error {
  border-radius: var(--radius-control);
}

.thumbnail,
.thumbnail-card img,
.finished-thumbnail-card img {
  border-radius: var(--radius-control);
}

.empty-state {
  display: grid;
  grid-column: 1 / -1;
  justify-items: center;
  width: 100%;
  max-width: 720px;
  margin: var(--space-4) auto 0;
  padding: clamp(26px, 5vw, 46px);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-card);
  background: radial-gradient(circle at 50% 0, rgba(29, 151, 232, .12), transparent 55%), var(--surface-inset);
  text-align: center;
}

.empty-state-icon {
  display: grid;
  place-items: center;
  min-width: 52px;
  height: 52px;
  margin-bottom: var(--space-3);
  padding: 0 10px;
  border: 1px solid #28638d;
  border-radius: 14px;
  background: #0c2941;
  color: #76cbff;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
  box-shadow: 0 12px 30px rgba(0, 0, 0, .24);
}

.empty-state .eyebrow {
  margin: 0 0 var(--space-1);
}

.empty-state h3 {
  margin-bottom: var(--space-2);
  font-size: clamp(1.25rem, 3vw, 1.55rem);
}

.empty-state > p:not(.eyebrow) {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
}

.empty-state .empty-state-example {
  margin: var(--space-4) 0;
  padding: 11px 14px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-control);
  background: #0b1928;
  color: #b8cce4;
  font-size: .9rem;
}

.empty-state-example strong {
  color: #75c9ff;
}

.empty-state button {
  min-width: 190px;
}

.asset-list > .empty-state {
  margin-top: var(--space-2);
}

/* Professional sidebar navigation */
aside#studioSidebar {
  overflow-x: hidden;
  overflow-y: auto;
}

.sidebar-nav {
  gap: 4px;
  margin-top: 4px;
}

.sidebar-nav-group {
  display: block;
  margin: 10px 10px 2px;
  color: var(--muted);
  font-size: .68rem;
  font-weight: 850;
  letter-spacing: .1em;
  line-height: 1.25;
  text-transform: uppercase;
}

.sidebar-nav-group:first-child {
  margin-top: 0;
}

.sidebar-nav button {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  align-items: center;
  gap: 11px;
  min-height: 42px;
  padding: 10px 11px;
  box-shadow: none;
}

.sidebar-nav-icon {
  width: 18px;
  height: 18px;
  justify-self: center;
  color: currentColor;
}

.sidebar-nav button.active {
  background: #132b47;
  color: #fff;
  box-shadow: inset 3px 0 0 var(--blue);
}

.sidebar-nav button.active .sidebar-nav-icon {
  color: #5fc4ff;
}

.sidebar-nav button[data-view="youtube"] .sidebar-youtube-icon {
  width: 32px;
  height: 22px;
  object-fit: contain;
}

/* Page-specific workspace headers */
.studio-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 26px;
}

.page-header-main {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  gap: 15px;
}

.page-header-icon {
  display: grid;
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid #295b82;
  border-radius: 14px;
  background: linear-gradient(145deg, #123a5a, #0a2036);
  color: #65c8ff;
  box-shadow: 0 12px 30px rgba(0, 0, 0, .26);
}

.page-header-icon[data-view="youtube"] {
  border-color: #8c2940;
  background: linear-gradient(145deg, #3d1220, #200b12);
  color: var(--youtube-red);
}

.page-header-icon .page-header-icon-svg {
  width: 22px;
  height: 22px;
}

.page-header-copy {
  min-width: 0;
}

.page-header-copy .eyebrow {
  margin-bottom: 3px;
}

.page-header-copy h1 {
  margin: 0;
  font-size: clamp(1.7rem, 2.5vw, 2.35rem);
  line-height: 1.12;
}

.page-header-subtitle {
  max-width: 760px;
  margin: 7px 0 0;
  color: #9eb2ca;
  line-height: 1.45;
}

.page-header-meta {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.studio-page-header .pill {
  padding: 7px 12px;
  background: rgba(8, 18, 31, .7);
  color: #8fa7c2;
  font-size: .82rem;
}

.studio-page-header #pageHeaderAction {
  min-height: 42px;
  padding: 9px 14px;
}

@media (min-width: 1051px) {
  .package-workspace:has(.results-panel.hidden) {
    grid-template-columns: minmax(0, 760px);
    justify-content: center;
  }
}

@media (max-width: 700px) {
  .studio-page-header {
    display: grid;
    gap: 15px;
    margin-bottom: 20px;
  }

  .page-header-main {
    gap: 12px;
  }

  .page-header-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
  }

  .page-header-icon .page-header-icon-svg {
    width: 20px;
    height: 20px;
  }

  .page-header-copy h1 {
    font-size: clamp(1.55rem, 8vw, 2rem);
  }

  .page-header-meta {
    width: 100%;
    justify-content: space-between;
  }

  .studio-page-header #pageHeaderAction {
    min-height: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  button,
  .button,
  input,
  textarea,
  select {
    transition: none;
  }

  button:not(:disabled):hover,
  .button:hover {
    transform: none;
  }

  button.youtube-action[aria-busy="true"]::before,
  .button.youtube-action[aria-busy="true"]::before {
    animation: none;
  }
}

@media (max-width: 700px) {
  :root {
    --radius-card: 16px;
    --space-5: 20px;
  }

  .panel,
  .stat,
  .plan-card {
    padding: 18px;
  }

  .feedback-sheet,
  .welcome-tour-sheet,
  .work-progress-sheet {
    border-radius: 0;
  }

  .actions > button,
  .actions > .button,
  .actions > a.button {
    min-height: 48px;
  }

  button.youtube-action,
  .button.youtube-action {
    justify-content: center;
  }

  .empty-state {
    padding: 26px 18px;
  }

  .empty-state button {
    width: 100%;
  }
}