:root {
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Source Sans 3", system-ui, sans-serif;
  --deep: #0c2f33;
  --teal: #1a5c62;
  --teal-mid: #2a7a82;
  --sand: #eef4f3;
  --sand-dark: #d5e3e1;
  --coral: #c45c4a;
  --text: #1a2426;
  --muted: #4a5a5d;
  --white: #fdfcfa;
  --panel: rgba(12, 47, 51, 0.92);
  --panel-border: rgba(255, 255, 255, 0.1);
  --radius: 12px;
  --sidebar-w: 300px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--deep);
}

[hidden] {
  display: none !important;
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--white);
}

/* —— Login modal —— */
.login-view {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 18, 20, 0.72);
  backdrop-filter: blur(6px);
}

.login-panel {
  position: relative;
  z-index: 1;
  width: min(420px, 100%);
  padding: 28px 28px 32px;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--deep) 92%, transparent);
  border: 1px solid var(--panel-border);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  color: var(--white);
}

.login-panel h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 500;
  line-height: 1.2;
}

.login-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.btn-block {
  width: 100%;
}

.examples-locked {
  display: grid;
  gap: 10px;
}

.login-lead {
  margin: 12px 0 0;
  color: color-mix(in srgb, var(--white) 78%, transparent);
  font-size: 0.95rem;
  line-height: 1.45;
}

.login-form {
  margin-top: 22px;
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: color-mix(in srgb, var(--white) 88%, transparent);
}

.field input {
  appearance: none;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  font-weight: 400;
  color: var(--text);
  background: var(--sand);
}

.field input:focus {
  outline: 2px solid var(--teal-mid);
  outline-offset: 1px;
}

.form-error {
  margin: 0;
  color: #ffb4a8;
  font-size: 0.9rem;
}

.login-credits {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--panel-border);
  font-size: 0.78rem;
  line-height: 1.45;
  color: color-mix(in srgb, var(--white) 62%, transparent);
}

.login-credits a,
.credits a {
  color: color-mix(in srgb, var(--sand) 88%, var(--teal-mid));
  text-decoration: underline;
  text-underline-offset: 2px;
}

.login-credits a:hover,
.credits a:hover {
  color: var(--white);
}

/* —— App shell —— */
.app-view {
  height: 100%;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px 24px;
  background: var(--panel);
  color: var(--white);
  border-right: 1px solid var(--panel-border);
  overflow: auto;
  z-index: 2;
}

.sidebar-head h1 {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
}

.client-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 10px 0 0;
  font-size: 0.9rem;
  color: color-mix(in srgb, var(--white) 75%, transparent);
}

.sidebar-section {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--panel-border);
}

.sidebar-section h2 {
  margin: 0 0 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--white) 65%, transparent);
}

.hint,
.hint-list {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.4;
  color: color-mix(in srgb, var(--white) 70%, transparent);
}

.hint code {
  font-size: 0.78em;
}

.hint-list {
  margin-top: 10px;
  padding-left: 1.1em;
}

.hint-list li + li {
  margin-top: 2px;
}

.transform-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px 8px;
  align-items: center;
  margin-top: 8px;
  font-size: 0.8rem;
}

.transform-label {
  grid-column: 1 / -1;
  margin-top: 4px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.7rem;
  color: color-mix(in srgb, var(--white) 60%, transparent);
}

.transform-grid label {
  display: grid;
  gap: 2px;
  min-width: 0;
  color: color-mix(in srgb, var(--white) 75%, transparent);
  font-size: 0.72rem;
}

.transform-grid input {
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 6px 7px;
  font: inherit;
  font-size: 0.82rem;
  color: var(--text);
  background: var(--sand);
}

.transform-grid input:focus {
  outline: 2px solid var(--teal-mid);
  outline-offset: 1px;
}

.transform-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.transform-warn {
  color: #ffc9a8 !important;
  border: 1px solid color-mix(in srgb, var(--coral) 45%, transparent);
  border-radius: 8px;
  padding: 8px 10px;
  margin-top: 8px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.mode-toggle-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mode-toggle-3 .mode-btn {
  padding-left: 6px;
  padding-right: 6px;
  font-size: 0.8rem;
}

.mode-btn.is-active,
.mode-chip.is-active {
  background: rgba(42, 122, 130, 0.45);
  border-color: color-mix(in srgb, var(--teal-mid) 70%, white);
  color: var(--white);
}

.exposure-control {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  font-size: 0.8rem;
  color: color-mix(in srgb, var(--white) 80%, transparent);
}

.exposure-control span {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  letter-spacing: 0.02em;
}

.exposure-control output {
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.exposure-control input[type="range"] {
  width: 100%;
  accent-color: var(--teal-mid);
}

.scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.scene-btn {
  width: 100%;
  text-align: left;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--white);
  cursor: pointer;
  font: inherit;
}

.scene-btn:hover,
.scene-btn.is-active {
  background: rgba(42, 122, 130, 0.35);
  border-color: color-mix(in srgb, var(--teal-mid) 60%, white);
}

.scene-btn strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
}

.scene-btn span {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: color-mix(in srgb, var(--white) 68%, transparent);
}

.upload-actions {
  display: grid;
  gap: 8px;
}

.file-btn {
  cursor: pointer;
}

.file-btn input {
  display: none;
}

.viewport {
  position: relative;
  min-width: 0;
  min-height: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(42, 122, 130, 0.18), transparent 50%),
    linear-gradient(180deg, #071a1d, #0c2f33 60%, #081618);
}

.canvas-host {
  position: absolute;
  inset: 0;
}

.canvas-host canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.drop-overlay {
  position: absolute;
  inset: 12px;
  z-index: 3;
  display: grid;
  place-items: center;
  border: 2px dashed color-mix(in srgb, var(--teal-mid) 70%, white);
  border-radius: var(--radius);
  background: rgba(12, 47, 51, 0.72);
  color: var(--white);
  font-family: var(--font-display);
  font-size: 1.25rem;
  pointer-events: none;
}

.status-bar {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(7, 26, 29, 0.78);
  border: 1px solid var(--panel-border);
  color: color-mix(in srgb, var(--white) 88%, transparent);
  font-size: 0.85rem;
  pointer-events: none;
}

.status-bar.is-error {
  border-color: color-mix(in srgb, var(--coral) 70%, white);
  color: #ffd4cc;
}

.sidebar-toggle {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 4;
}

/* —— Buttons —— */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background: var(--coral);
  color: var(--white);
  border-color: color-mix(in srgb, var(--coral) 80%, black);
}

.btn-primary:hover {
  filter: brightness(1.06);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  border-color: var(--panel-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-ghost {
  background: transparent;
  color: color-mix(in srgb, var(--white) 85%, transparent);
  border-color: var(--panel-border);
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.8rem;
}

@media (max-width: 820px) {
  .app-view {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: absolute;
    inset: 0 auto 0 0;
    width: min(var(--sidebar-w), 88vw);
    transform: translateX(0);
    transition: transform 0.2s ease;
  }

  .app-view.sidebar-collapsed .sidebar {
    transform: translateX(-105%);
  }

  .sidebar-toggle {
    display: inline-flex;
  }
}