/* =========================================================================
   M3 Design Tokens — Dark Theme, Teal Primary
   https://m3.material.io/styles/color/the-color-system/tokens
   ========================================================================= */
:root {
  /* Primary (Teal) */
  --md-sys-color-primary:              #4DD0C4;
  --md-sys-color-on-primary:           #003731;
  --md-sys-color-primary-container:    #005047;
  --md-sys-color-on-primary-container: #70F7EA;

  /* Secondary */
  --md-sys-color-secondary:            #B2BDBA;
  --md-sys-color-on-secondary:         #1D2E2B;
  --md-sys-color-secondary-container:  #344540;
  --md-sys-color-on-secondary-container:#CED8D5;

  /* Error */
  --md-sys-color-error:                #FFB4AB;
  --md-sys-color-error-container:      #93000A;

  /* Surfaces */
  --md-sys-color-background:           #0E1514;
  --md-sys-color-on-background:        #DDE4E2;
  --md-sys-color-surface:              #0E1514;
  --md-sys-color-on-surface:           #DDE4E2;
  --md-sys-color-surface-variant:      #3B4947;
  --md-sys-color-on-surface-variant:   #BBC9C6;
  --md-sys-color-surface-container-lowest:  #091110;
  --md-sys-color-surface-container-low:     #161D1C;
  --md-sys-color-surface-container:         #1A2120;
  --md-sys-color-surface-container-high:    #252C2B;
  --md-sys-color-surface-container-highest: #2F3736;

  /* Outline */
  --md-sys-color-outline:              #859390;
  --md-sys-color-outline-variant:      #3B4947;

  /* Inverse */
  --md-sys-color-inverse-surface:      #DDE4E2;
  --md-sys-color-inverse-on-surface:   #2B3231;
  --md-sys-color-inverse-primary:      #006B5F;

  /* Tonal Shapes (M3 Shape Scale) */
  --md-shape-extra-small: 4px;
  --md-shape-small:        8px;
  --md-shape-medium:      12px;
  --md-shape-large:       16px;
  --md-shape-extra-large: 28px;
  --md-shape-full:        9999px;

  /* Elevation shadows (M3 tonal elevation) */
  --md-elevation-1: 0 1px 2px rgba(0,0,0,.3), 0 1px 3px 1px rgba(0,0,0,.15);
  --md-elevation-2: 0 1px 2px rgba(0,0,0,.3), 0 2px 6px 2px rgba(0,0,0,.15);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.3);

  /* Typography (M3 Type Scale) */
  --md-sys-typescale-display-font: "Roboto Flex", sans-serif;
  --md-sys-typescale-body-font:    "Roboto Flex", sans-serif;
  --md-sys-typescale-label-font:   "Roboto Flex", sans-serif;
  --md-sys-typescale-mono-font:    "Roboto Mono", monospace;

  /* Transition */
  --md-motion-duration-short2: 100ms;
  --md-motion-duration-medium2: 300ms;
  --md-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
}

/* =========================================================================
   Reset & Base
   ========================================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  font-family: var(--md-sys-typescale-body-font);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
}

/* =========================================================================
   Layout
   ========================================================================= */
.app-shell {
  display: grid;
  grid-template-rows: 56px 48px 1fr;
  grid-template-columns: clamp(380px, 30vw, 460px) 1fr;
  height: 100vh;
}

/* ── Top App Bar ─────────────────────────────────────────────────────── */
.top-app-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--md-sys-color-surface-container);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  box-shadow: var(--md-elevation-1);
  z-index: 10;
}

.app-bar-icon {
  width: 32px; height: 32px;
  border-radius: var(--md-shape-small);
  background: var(--md-sys-color-primary-container);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}

.app-bar-title {
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--md-sys-color-on-surface);
  flex-shrink: 0;
}
.app-bar-title span {
  color: var(--md-sys-color-primary);
  font-weight: 600;
}

.app-bar-divider {
  width: 1px; height: 24px;
  background: var(--md-sys-color-outline-variant);
  margin: 0 4px;
}

.app-bar-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--md-sys-color-on-surface-variant);
  flex-shrink: 0;
}

/* ── Preset-Chips-Bar ────────────────────────────────────────────────── */
.preset-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  background: var(--md-sys-color-surface-container-low);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  overflow: hidden;
}

.preset-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  min-width: max-content;
}

.preset-divider {
  width: 1px;
  height: 24px;
  background: var(--md-sys-color-outline-variant);
  flex-shrink: 0;
  margin: 0 2px;
}

.templates-scroll {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  white-space: nowrap;
}
.templates-scroll::-webkit-scrollbar { display: none; }

.templates-track {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: max-content;
  padding-right: 4px;
}

.templates-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.preset-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--md-sys-color-outline);
  flex-shrink: 0;
  margin-right: 4px;
}

/* M3 Assist/Filter Chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: 32px;
  border-radius: var(--md-shape-full);
  border: 1px solid var(--md-sys-color-outline-variant);
  background: transparent;
  color: var(--md-sys-color-on-surface-variant);
  font-family: var(--md-sys-typescale-label-font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background var(--md-motion-duration-short2) var(--md-motion-easing-standard),
    color       var(--md-motion-duration-short2) var(--md-motion-easing-standard),
    border-color var(--md-motion-duration-short2) var(--md-motion-easing-standard);
  flex-shrink: 0;
}
.chip:hover {
  background: color-mix(in srgb, var(--md-sys-color-on-surface) 8%, transparent);
}
.chip.active {
  background: var(--md-sys-color-secondary-container);
  border-color: transparent;
  color: var(--md-sys-color-on-secondary-container);
}
.chip-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── Sidebar ─────────────────────────────────────────────────────────── */
.sidebar {
  background: var(--md-sys-color-surface-container-low);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--md-sys-color-outline-variant) transparent;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.sidebar-inner { padding: 12px; flex: 1; }

/* ── Accordion-Sektion ───────────────────────────────────────────────── */
.section {
  border-radius: var(--md-shape-large);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--md-sys-color-surface-container);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
  transition:
    background var(--md-motion-duration-short2) var(--md-motion-easing-standard),
    transform var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}
.section-header:hover {
  background: color-mix(in srgb, var(--md-sys-color-on-surface) 10%, transparent);
}

.section-icon {
  font-size: 16px;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.section-title {
  flex: 1;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: .03em;
  color: var(--md-sys-color-on-surface);
}

.section-chevron {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0;
  transition: transform var(--md-motion-duration-medium2) var(--md-motion-easing-standard), color var(--md-motion-duration-short2) ease;
  transform-origin: center;
}
.section-chevron::before {
  content: '';
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  margin-top: -2px;
  opacity: .95;
  transition: transform var(--md-motion-duration-medium2) var(--md-motion-easing-standard);
}
.section.open .section-chevron { color: var(--md-sys-color-primary); }
.section.open .section-chevron::before { transform: rotate(225deg); }

.section-body {
  padding: 2px 16px 16px;
  display: none;
  flex-direction: column;
  gap: 12px;
}
.section.open .section-body { display: flex; }

#gradient-controls,
#layer2-controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 2px;
}

#gradient-controls {
  margin-top: 2px;
}

#layer2-controls {
  margin-top: 4px;
}

#gradient-angle-row {
  margin-top: 4px;
}

/* ── Control-Zeile ───────────────────────────────────────────────────── */
.ctrl-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0;
  gap: 12px;
}
.ctrl-row:last-child { margin-bottom: 0; }

.ctrl-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
  flex-shrink: 0;
  width: 124px;
}

.ctrl-input-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

/* ── M3 Slider ───────────────────────────────────────────────────────── */
.m3-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--md-sys-color-surface-container-highest);
  border-radius: var(--md-shape-full);
  outline: none;
  cursor: pointer;
}
.m3-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--md-sys-color-primary);
  box-shadow: 0 0 0 0px color-mix(in srgb, var(--md-sys-color-primary) 0%, transparent);
  transition: box-shadow var(--md-motion-duration-short2) ease;
}
.m3-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 8px color-mix(in srgb, var(--md-sys-color-primary) 20%, transparent);
}
.m3-slider:active::-webkit-slider-thumb {
  box-shadow: 0 0 0 10px color-mix(in srgb, var(--md-sys-color-primary) 24%, transparent);
}
/* Track-Fortschritt via CSS-Background wird per JS gesetzt */

/* ── M3 Number Input ─────────────────────────────────────────────────── */
.m3-input {
  width: 54px;
  height: 32px;
  background: var(--md-sys-color-surface-container-highest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-extra-small);
  color: var(--md-sys-color-on-surface);
  font-family: var(--md-sys-typescale-mono-font);
  font-size: 12px;
  text-align: center;
  outline: none;
  padding: 0 4px;
  transition: border-color var(--md-motion-duration-short2) ease;
}
.m3-input:focus {
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--md-sys-color-primary) 20%, transparent);
}

/* ── Color Picker Wrapper ─────────────────────────────────────────────── */
.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
.color-swatch {
  width: 28px; height: 28px;
  border-radius: var(--md-shape-extra-small);
  border: 2px solid var(--md-sys-color-outline-variant);
  cursor: pointer;
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
}
.color-swatch input[type="color"] {
  position: absolute;
  inset: -4px;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
  opacity: 0;
  cursor: pointer;
}
.color-hex {
  flex: 1;
  height: 28px;
  background: var(--md-sys-color-surface-container-highest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-extra-small);
  color: var(--md-sys-color-on-surface);
  font-family: var(--md-sys-typescale-mono-font);
  font-size: 12px;
  padding: 0 8px;
  outline: none;
}
.color-hex:focus { border-color: var(--md-sys-color-primary); }

/* ── M3 Select ───────────────────────────────────────────────────────── */
.m3-select {
  flex: 1;
  height: 32px;
  background: var(--md-sys-color-surface-container-highest);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-shape-extra-small);
  color: var(--md-sys-color-on-surface);
  font-family: var(--md-sys-typescale-body-font);
  font-size: 13px;
  padding: 0 8px;
  outline: none;
  cursor: pointer;
}
.m3-select:focus { border-color: var(--md-sys-color-primary); }

/* ── M3 Toggle Switch ────────────────────────────────────────────────── */
.m3-switch-track {
  display: inline-flex;
  align-items: center;
  width: 52px; height: 32px;
  border-radius: var(--md-shape-full);
  background: var(--md-sys-color-surface-variant);
  border: 2px solid var(--md-sys-color-outline);
  cursor: pointer;
  position: relative;
  transition:
    background var(--md-motion-duration-medium2) var(--md-motion-easing-standard),
    border-color var(--md-motion-duration-medium2) var(--md-motion-easing-standard);
}
.m3-switch-track.checked {
  background: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
}
.m3-switch-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--md-sys-color-outline);
  position: absolute;
  left: 6px;
  transition:
    left var(--md-motion-duration-medium2) var(--md-motion-easing-standard),
    background var(--md-motion-duration-medium2) var(--md-motion-easing-standard);
}
.m3-switch-track.checked .m3-switch-thumb {
  left: 26px;
  background: var(--md-sys-color-on-primary);
}
.m3-switch-track input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

/* ── Sidebar Footer Buttons ───────────────────────────────────────────── */
.sidebar-footer {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
}

/* M3 Filled Button */
.btn-filled {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 24px;
  border-radius: var(--md-shape-full);
  border: none;
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  font-family: var(--md-sys-typescale-label-font);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .03em;
  cursor: pointer;
  transition: box-shadow var(--md-motion-duration-short2) ease,
              opacity var(--md-motion-duration-short2) ease;
}
.btn-filled:hover { box-shadow: var(--md-elevation-1); }
.btn-filled:active { opacity: .88; }
.btn-filled:disabled { opacity: .38; cursor: default; box-shadow: none; }

/* M3 Outlined Button */
.btn-outlined {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 24px;
  border-radius: var(--md-shape-full);
  border: 1px solid var(--md-sys-color-outline);
  background: transparent;
  color: var(--md-sys-color-primary);
  font-family: var(--md-sys-typescale-label-font);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .03em;
  cursor: pointer;
  transition: background var(--md-motion-duration-short2) ease;
}
.btn-outlined:hover {
  background: color-mix(in srgb, var(--md-sys-color-primary) 8%, transparent);
}
.btn-outlined:disabled { opacity: .38; cursor: default; }

/* ── Main Preview Area ────────────────────────────────────────────────── */
.preview-area {
  background: var(--md-sys-color-background);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  min-width: 0;
}

@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: minmax(340px, 44vw) 1fr;
  }
}

.preview-canvas-wrapper {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  width: 100%;
  padding: 24px;
  overflow: hidden;
  cursor: grab;
}

.preview-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--md-shape-medium);
  box-shadow: var(--md-elevation-3);
  display: block;
  transition: none;
  will-change: transform;
}

/* Skeleton / Ladestate */
.preview-skeleton {
  width: 100%;
  aspect-ratio: 16/9;
  max-height: calc(100vh - 160px);
  background: var(--md-sys-color-surface-container);
  border-radius: var(--md-shape-medium);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--md-sys-color-on-surface-variant);
}

.skeleton-icon {
  font-size: 48px;
  opacity: .4;
}
.skeleton-text {
  font-size: 14px;
  opacity: .6;
}

/* Ladeoverlay */
.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: color-mix(in srgb, var(--md-sys-color-background) 70%, transparent);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease;
  z-index: 5;
}
.loading-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* M3 Circular Progress (CSS-only) */
.progress-ring {
  width: 48px; height: 48px;
  display: block;
  animation: rotate 1.2s linear infinite;
  transform-box: fill-box;
  transform-origin: center;
}
.progress-ring-circle {
  fill: none;
  stroke: var(--md-sys-color-primary);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 110;
  stroke-dashoffset: 80;
  animation: dash 1.2s ease-in-out infinite;
  transform-box: fill-box;
  transform-origin: center;
}
@keyframes rotate { to { transform: rotate(360deg); } }
@keyframes dash {
  0%   { stroke-dashoffset: 92; }
  50%  { stroke-dashoffset: 22; }
  100% { stroke-dashoffset: 92; }
}

.loading-text {
  font-size: 13px;
  color: var(--md-sys-color-on-surface-variant);
}

/* ── Preview Statusleiste ────────────────────────────────────────────── */
.preview-statusbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 24px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  background: var(--md-sys-color-surface-container-low);
  width: 100%;
  font-size: 12px;
  color: var(--md-sys-color-on-surface-variant);
}

.status-info-link {
  margin-left: auto;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--md-sys-color-outline-variant);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--md-sys-color-on-surface-variant);
  background: color-mix(in srgb, var(--md-sys-color-on-surface) 4%, transparent);
  text-decoration: none;
  flex: 0 0 auto;
  transition:
    background var(--md-motion-duration-short2) var(--md-motion-easing-standard),
    color var(--md-motion-duration-short2) var(--md-motion-easing-standard),
    border-color var(--md-motion-duration-short2) var(--md-motion-easing-standard),
    transform var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.status-info-link:hover {
  color: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
  background: color-mix(in srgb, var(--md-sys-color-primary) 12%, transparent);
  transform: translateY(-1px);
}

.status-info-link:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

.status-value {
  font-family: var(--md-sys-typescale-mono-font);
  color: var(--md-sys-color-on-surface);
  font-size: 11px;
}

/* ── Divider ─────────────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--md-sys-color-outline-variant);
  margin: 10px 0;
}

/* ── Scrollbar Styling ───────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--md-sys-color-outline-variant);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--md-sys-color-outline); }

/* ── Toast-Benachrichtigungen (M3 Snackbar) ─────────────────────────── */
.snackbar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--md-sys-color-inverse-surface);
  color: var(--md-sys-color-inverse-on-surface);
  padding: 12px 24px;
  border-radius: var(--md-shape-extra-small);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--md-elevation-3);
  z-index: 1000;
  transition: transform var(--md-motion-duration-medium2) var(--md-motion-easing-standard);
  pointer-events: none;
}
.snackbar.visible {
  transform: translateX(-50%) translateY(0);
}

/* ── Seed-Würfel-Button ───────────────────────────────────────────────── */
.btn-icon-sm {
  width: 28px; height: 28px;
  border-radius: var(--md-shape-extra-small);
  border: 1px solid var(--md-sys-color-outline-variant);
  background: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface-variant);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 13px;
  transition: background var(--md-motion-duration-short2) ease;
  flex-shrink: 0;
}
.btn-icon-sm:hover { background: var(--md-sys-color-surface-container-highest); color: var(--md-sys-color-on-surface); }

.lucide {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

.lucide-sm {
  width: 14px;
  height: 14px;
}

.lucide-lg {
  width: 24px;
  height: 24px;
  stroke-width: 1.5;
}

@keyframes dice-roll {
  0%   { transform: rotate(0deg) scale(1); }
  20%  { transform: rotate(72deg) scale(1.35); }
  40%  { transform: rotate(144deg) scale(0.9); }
  60%  { transform: rotate(216deg) scale(1.2); }
  80%  { transform: rotate(288deg) scale(0.95); }
  100% { transform: rotate(360deg) scale(1); }
}

.rolling {
  animation: dice-roll 480ms cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
  display: inline-block;
}