/* ========================================
   Papery - Product Workspace
   ======================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue-700: oklch(0.55 0.22 259);
  --blue-600: oklch(0.62 0.21 258);
  --blue-500: oklch(0.68 0.19 254);
  --blue-100: oklch(0.95 0.035 253);
  --cyan-500: oklch(0.72 0.13 208);
  --violet-500: oklch(0.64 0.18 292);
  --red-500: oklch(0.62 0.21 24);
  --green-500: oklch(0.67 0.16 151);
  --ink: oklch(0.18 0.04 258);
  --ink-soft: oklch(0.39 0.04 258);
  --muted: oklch(0.57 0.035 258);
  --line: oklch(0.9 0.018 250);
  --line-strong: oklch(0.82 0.035 250);
  --paper: oklch(0.985 0.006 250);
  --panel: oklch(0.998 0.004 250);
  --panel-blue: oklch(0.97 0.018 250);
  --shadow-sm: 0 1px 2px oklch(0.2 0.04 258 / 0.06);
  --shadow-md: 0 14px 35px oklch(0.36 0.1 258 / 0.12);
  --shadow-lg: 0 24px 70px oklch(0.36 0.12 258 / 0.18);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 180ms cubic-bezier(0.25, 1, 0.5, 1);
  --max-width: 1280px;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 8%, oklch(0.9 0.08 253 / 0.56), transparent 30rem),
    linear-gradient(180deg, oklch(0.985 0.01 250), oklch(0.955 0.022 250));
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               "HarmonyOS Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

button,
select {
  font: inherit;
}

button:focus-visible,
select:focus-visible,
.drop-zone:focus-visible {
  outline: 3px solid oklch(0.76 0.15 254 / 0.32);
  outline-offset: 2px;
}

.app-container {
  width: min(100%, var(--max-width));
  min-height: 100vh;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
}

/* --- Header --- */
.app-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 13px;
  min-width: 0;
}

.brand-mark {
  position: relative;
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  box-shadow: 0 12px 26px oklch(0.56 0.19 254 / 0.22);
  overflow: hidden;
}

.brand-mark::after {
  content: "";
  position: absolute;
  width: 22px;
  height: 16px;
  top: 10px;
  right: 8px;
  border-radius: 10px;
  background: var(--panel);
}

.brand-mark-line {
  position: absolute;
  left: 8px;
  width: 10px;
  height: 3px;
  border-radius: 999px;
  background: oklch(0.9 0.08 251);
}

.brand-mark-line:nth-child(1) { top: 13px; }
.brand-mark-line:nth-child(2) { top: 22px; }
.brand-mark-line:nth-child(3) { top: 31px; }

.brand-mark-p {
  position: absolute;
  right: 8px;
  bottom: 2px;
  color: var(--panel);
  font-size: 34px;
  line-height: 1;
  font-weight: 850;
  letter-spacing: 0;
}

header h1 {
  color: var(--ink);
  font-size: 24px;
  line-height: 1.08;
  font-weight: 820;
  letter-spacing: 0;
}

.brand-subtitle {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* --- Buttons --- */
.btn-text,
.btn-primary,
.btn-export,
.btn-rotate,
.btn-delete {
  border: 0;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition),
              box-shadow var(--transition), transform var(--transition), opacity var(--transition);
}

.btn-text {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
  background: oklch(0.995 0.005 250 / 0.9);
  white-space: nowrap;
}

.btn-text:hover {
  border-color: var(--line-strong);
  color: var(--blue-700);
  background: var(--panel);
}

.btn-primary {
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-sm);
  color: oklch(0.995 0.005 250);
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  box-shadow: 0 12px 26px oklch(0.56 0.19 254 / 0.26);
  font-size: 15px;
  font-weight: 720;
}

.btn-primary:hover,
.btn-export:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 16px 34px oklch(0.56 0.19 254 / 0.32);
}

.btn-primary:active,
.btn-export:active:not(:disabled) {
  transform: translateY(0);
}

/* --- Hero --- */
main {
  flex: 1;
}

.product-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(360px, 0.94fr);
  gap: 28px;
  min-height: 312px;
  padding: 38px 42px 30px;
  border: 1px solid oklch(0.91 0.025 250);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    linear-gradient(120deg, oklch(0.997 0.006 250) 0%, oklch(0.965 0.025 251) 52%, oklch(0.985 0.008 250) 100%);
  box-shadow: var(--shadow-md);
}

.product-hero::before {
  content: "";
  position: absolute;
  inset: 30px 270px 0 auto;
  width: 360px;
  background: linear-gradient(90deg, transparent, oklch(0.79 0.11 253 / 0.28), transparent);
  transform: skewX(-22deg);
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  align-self: center;
}

.eyebrow,
.panel-kicker {
  display: block;
  color: var(--blue-700);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero-copy h2 {
  max-width: 620px;
  margin-top: 12px;
  color: var(--ink);
  font-size: 39px;
  line-height: 1.12;
  font-weight: 850;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 62ch;
  margin-top: 14px;
  color: var(--ink-soft);
  font-size: 16px;
}

.feature-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 30px;
}

.feature-row > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 680;
}

.feature-row i {
  position: relative;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  color: var(--blue-600);
}

.icon-upload::before {
  content: "";
  position: absolute;
  inset: 4px 7px 5px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg);
}

.icon-upload::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: 3px;
  height: 7px;
  border: 2px solid currentColor;
  border-top: 0;
  border-radius: 0 0 4px 4px;
}

.icon-stack::before,
.icon-stack::after {
  content: "";
  position: absolute;
  left: 3px;
  right: 3px;
  height: 8px;
  border: 2px solid currentColor;
  border-radius: 4px;
}

.icon-stack::before { top: 4px; }
.icon-stack::after { bottom: 4px; transform: translateX(3px); opacity: 0.72; }

.icon-grid::before {
  content: "";
  position: absolute;
  inset: 3px;
  background:
    linear-gradient(currentColor, currentColor) 0 0 / 7px 7px no-repeat,
    linear-gradient(currentColor, currentColor) 100% 0 / 7px 7px no-repeat,
    linear-gradient(currentColor, currentColor) 0 100% / 7px 7px no-repeat,
    linear-gradient(currentColor, currentColor) 100% 100% / 7px 7px no-repeat;
  border-radius: 3px;
}

.icon-bolt::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 2px;
  width: 9px;
  height: 18px;
  background: currentColor;
  clip-path: polygon(58% 0, 24% 45%, 54% 45%, 32% 100%, 78% 35%, 49% 35%);
}

.hero-visual {
  position: relative;
  min-height: 250px;
}

.flying-card,
.pdf-sheet {
  position: absolute;
  border: 1px solid oklch(0.88 0.035 250);
  background: var(--panel);
  box-shadow: 0 18px 36px oklch(0.4 0.11 250 / 0.14);
}

.flying-card {
  width: 84px;
  height: 66px;
  border-radius: 14px;
}

.flying-card::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 9px;
  background:
    radial-gradient(circle at 78% 28%, oklch(0.91 0.06 78) 0 7px, transparent 8px),
    linear-gradient(135deg, oklch(0.82 0.12 213), oklch(0.62 0.18 253));
}

.card-one { left: 16px; top: 26px; transform: rotate(9deg); }
.card-two { left: 68px; top: 116px; transform: rotate(-8deg) scale(0.86); }
.card-two::before { background: linear-gradient(135deg, oklch(0.84 0.09 51), oklch(0.74 0.16 30)); }
.card-three { left: 154px; top: 82px; transform: rotate(7deg) scale(0.7); }
.card-three::before { background: linear-gradient(135deg, oklch(0.84 0.1 145), oklch(0.69 0.12 171)); }

.pdf-sheet {
  right: 38px;
  top: 38px;
  width: 148px;
  height: 184px;
  padding: 28px 22px;
  border-radius: 18px 28px 18px 18px;
  transform: rotate(-8deg);
}

.pdf-sheet::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 42px;
  border-radius: 0 26px 0 12px;
  background: linear-gradient(135deg, oklch(0.91 0.055 251), oklch(0.72 0.16 252));
}

.pdf-sheet span {
  display: inline-flex;
  align-items: center;
  height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  color: oklch(0.995 0.005 250);
  background: var(--red-500);
  box-shadow: 0 9px 18px oklch(0.6 0.2 24 / 0.24);
  font-size: 24px;
  font-weight: 850;
  transform: rotate(5deg);
}

.pdf-sheet i {
  display: block;
  height: 8px;
  margin-top: 18px;
  border-radius: 999px;
  background: oklch(0.9 0.02 250);
}

.pdf-sheet i:nth-child(3) { width: 76%; }
.pdf-sheet i:nth-child(4) { width: 58%; }

/* --- Workspace --- */
.workspace-shell {
  display: grid;
  grid-template-columns: 276px minmax(0, 1fr) 282px;
  align-items: stretch;
  gap: 18px;
  margin-top: 18px;
}

.upload-panel,
.preview-panel,
.export-panel {
  min-width: 0;
  border: 1px solid var(--line);
  background: oklch(0.996 0.006 250 / 0.95);
  box-shadow: var(--shadow-sm);
}

.upload-panel {
  border-radius: var(--radius-lg) var(--radius-sm) var(--radius-sm) var(--radius-lg);
  padding: 20px;
}

.preview-panel {
  border-radius: var(--radius-sm);
  padding: 20px;
  background:
    linear-gradient(180deg, oklch(0.996 0.006 250), oklch(0.975 0.012 250));
}

.export-panel {
  border-radius: var(--radius-sm) var(--radius-lg) var(--radius-lg) var(--radius-sm);
  padding: 20px;
}

.panel-heading h2,
.toolbar h2 {
  margin-top: 5px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.22;
  font-weight: 780;
  letter-spacing: 0;
}

/* --- Drop Zone --- */
.drop-zone {
  position: relative;
  margin-top: 18px;
  min-height: 250px;
  padding: 26px 18px;
  border: 1.5px dashed oklch(0.79 0.08 253);
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, oklch(0.986 0.012 250), oklch(0.955 0.036 252));
  text-align: center;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
}

.drop-zone:hover {
  border-color: var(--blue-600);
  background: linear-gradient(180deg, oklch(0.986 0.018 250), var(--blue-100));
  box-shadow: inset 0 0 0 1px oklch(0.74 0.12 253 / 0.22);
}

.drop-zone.drag-over {
  border-color: var(--blue-600);
  border-style: solid;
  transform: translateY(-1px);
  box-shadow: inset 0 0 0 2px oklch(0.68 0.18 253 / 0.18);
}

.drop-zone-content {
  min-height: 198px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.upload-icon {
  width: 86px;
  height: 70px;
  position: relative;
}

.upload-picture {
  position: absolute;
  inset: 7px 4px 0;
  border: 1px solid oklch(0.83 0.06 253);
  border-radius: 13px;
  background:
    radial-gradient(circle at 72% 30%, oklch(0.9 0.08 77) 0 6px, transparent 7px),
    linear-gradient(135deg, oklch(0.82 0.11 211), var(--blue-600));
  transform: rotate(7deg);
  box-shadow: 0 16px 24px oklch(0.46 0.11 253 / 0.18);
}

.upload-picture::before,
.upload-picture::after {
  content: "";
  position: absolute;
  width: 52px;
  height: 42px;
  border: 1px solid oklch(0.86 0.04 253);
  border-radius: 10px;
  background: var(--panel);
  z-index: -1;
}

.upload-picture::before {
  left: -12px;
  top: 10px;
  transform: rotate(-13deg);
}

.upload-picture::after {
  right: -12px;
  top: -4px;
  transform: rotate(11deg);
}

.drop-zone p {
  max-width: 20ch;
  color: var(--ink-soft);
  font-size: 14px;
}

.drop-overlay {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--blue-700);
  background: oklch(0.93 0.06 253 / 0.86);
  font-size: 18px;
  font-weight: 780;
}

.drop-zone.drag-over .drop-overlay {
  display: flex;
}

.privacy-note {
  margin-top: 16px;
  padding: 12px;
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  background: var(--panel-blue);
  font-size: 13px;
}

/* --- Toolbar --- */
.toolbar {
  min-height: 54px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.image-count {
  flex: 0 0 auto;
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 0 10px;
  border-radius: 999px;
  color: var(--blue-700);
  background: var(--blue-100);
  font-size: 13px;
  font-weight: 760;
  white-space: nowrap;
}

/* --- Thumbnail Grid --- */
.thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(136px, 1fr));
  gap: 14px;
  min-height: 424px;
  align-content: start;
}

.thumbnail-grid:empty,
.thumbnail-grid .empty-state {
  grid-column: 1 / -1;
  min-height: 424px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  color: var(--muted);
  background:
    linear-gradient(90deg, oklch(0.91 0.014 250) 1px, transparent 1px),
    linear-gradient(0deg, oklch(0.91 0.014 250) 1px, transparent 1px),
    oklch(0.985 0.008 250);
  background-size: 32px 32px;
  font-size: 14px;
  text-align: center;
}

.thumb-item {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  cursor: grab;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  user-select: none;
}

.thumb-item:hover {
  border-color: oklch(0.79 0.08 253);
  box-shadow: 0 16px 30px oklch(0.32 0.08 253 / 0.12);
}

.thumb-item:active {
  cursor: grabbing;
}

.thumb-item.sortable-chosen {
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}

.thumb-item.sortable-ghost {
  opacity: 0.42;
  border: 2px dashed var(--blue-600);
}

.thumb-img-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1.22;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(90deg, oklch(0.91 0.012 250) 1px, transparent 1px),
    linear-gradient(0deg, oklch(0.91 0.012 250) 1px, transparent 1px),
    oklch(0.967 0.012 250);
  background-size: 22px 22px;
}

.thumb-img-wrapper img {
  max-width: calc(100% - 18px);
  max-height: calc(100% - 18px);
  object-fit: contain;
  display: block;
  border-radius: 6px;
  box-shadow: 0 8px 18px oklch(0.28 0.04 250 / 0.14);
  transition: transform var(--transition);
}

.rotation-90 img { transform: rotate(90deg); }
.rotation-180 img { transform: rotate(180deg); }
.rotation-270 img { transform: rotate(270deg); }

.thumb-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 6px;
  opacity: 0;
  transition: opacity var(--transition);
}

.thumb-item:hover .thumb-actions,
.thumb-actions:focus-within {
  opacity: 1;
}

.btn-rotate,
.btn-delete {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  color: oklch(0.995 0.005 250);
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 8px 16px oklch(0.2 0.06 250 / 0.18);
}

.btn-rotate {
  background: oklch(0.58 0.17 254 / 0.94);
}

.btn-delete {
  background: oklch(0.58 0.2 24 / 0.94);
}

.btn-rotate:hover,
.btn-delete:hover {
  transform: translateY(-1px);
}

.thumb-info {
  padding: 9px 10px 10px;
  border-top: 1px solid var(--line);
}

.thumb-name {
  margin-bottom: 5px;
  color: var(--ink-soft);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.thumb-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 11px;
}

.order-num {
  min-width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  color: var(--blue-700);
  background: var(--blue-100);
  font-weight: 800;
}

.img-size {
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: "SF Mono", Menlo, Monaco, Consolas, monospace;
  white-space: nowrap;
}

/* --- Settings --- */
.settings {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.setting-group {
  display: grid;
  gap: 7px;
}

.setting-group label {
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 700;
}

.setting-group select {
  width: 100%;
  min-height: 42px;
  padding: 0 38px 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink);
  background:
    linear-gradient(45deg, transparent 50%, var(--blue-600) 50%) right 17px center / 6px 6px no-repeat,
    linear-gradient(135deg, var(--blue-600) 50%, transparent 50%) right 11px center / 6px 6px no-repeat,
    var(--panel);
  appearance: none;
  cursor: pointer;
}

.setting-group select:hover {
  border-color: var(--line-strong);
}

.setting-group select:focus {
  border-color: var(--blue-600);
}

/* --- Export Section --- */
.export-section {
  margin-top: 18px;
}

.btn-export {
  width: 100%;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: var(--radius-sm);
  color: oklch(0.995 0.005 250);
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  box-shadow: 0 14px 30px oklch(0.56 0.19 254 / 0.26);
  font-size: 16px;
  font-weight: 800;
}

.btn-export::before {
  content: "";
  width: 17px;
  height: 20px;
  border-radius: 3px 7px 3px 3px;
  background:
    linear-gradient(135deg, transparent 0 50%, oklch(0.84 0.08 251) 51%) right top / 8px 8px no-repeat,
    oklch(0.995 0.005 250);
}

.btn-export:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
  box-shadow: none;
}

.export-hint {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.hint-icon {
  position: relative;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  border-radius: 50%;
  background: var(--blue-100);
}

.hint-icon::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  width: 2px;
  height: 10px;
  border-radius: 999px;
  background: var(--blue-700);
}

.hint-icon::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 3px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue-700);
}

/* --- Footer --- */
footer {
  margin-top: 24px;
  padding: 18px 0 22px;
  text-align: center;
}

footer p {
  color: var(--muted);
  font-size: 13px;
}

/* --- Loading Overlay --- */
.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  background: oklch(0.18 0.04 258 / 0.72);
}

.loading-overlay.active {
  display: flex;
}

.loading-spinner {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 4px solid oklch(0.995 0.006 250 / 0.24);
  border-top-color: oklch(0.995 0.006 250);
  animation: spin 800ms linear infinite;
}

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

.loading-overlay p {
  color: oklch(0.985 0.006 250);
  font-size: 16px;
  font-weight: 700;
}

/* --- Toast --- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  z-index: 1001;
  max-width: calc(100vw - 32px);
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  color: oklch(0.995 0.005 250);
  font-size: 14px;
  font-weight: 700;
  pointer-events: none;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-50%) translateY(32px);
  transition: opacity 240ms cubic-bezier(0.25, 1, 0.5, 1),
              transform 240ms cubic-bezier(0.25, 1, 0.5, 1);
}

.toast.active {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.success { background: var(--green-500); }
.toast.error { background: var(--red-500); }
.toast.info { background: var(--blue-600); }

/* --- Responsive --- */
@media (max-width: 1100px) {
  .product-hero {
    grid-template-columns: minmax(0, 1fr) 330px;
    padding: 32px;
  }

  .hero-copy h2 {
    font-size: 34px;
  }

  .workspace-shell {
    grid-template-columns: minmax(240px, 0.72fr) minmax(0, 1fr);
  }

  .export-panel {
    grid-column: 1 / -1;
    border-radius: var(--radius-md);
  }

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

  .export-section,
  .export-hint {
    max-width: 420px;
  }
}

@media (max-width: 820px) {
  .app-container {
    padding: 0 16px;
  }

  .app-header {
    align-items: flex-start;
  }

  .brand-subtitle {
    display: none;
  }

  .product-hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding: 26px;
  }

  .hero-copy h2 {
    font-size: 30px;
  }

  .hero-visual {
    min-height: 210px;
  }

  .workspace-shell {
    grid-template-columns: 1fr;
  }

  .upload-panel,
  .preview-panel,
  .export-panel {
    border-radius: var(--radius-md);
  }

  .drop-zone {
    min-height: 214px;
  }

  .drop-zone-content {
    min-height: 162px;
  }

  .thumbnail-grid,
  .thumbnail-grid:empty,
  .thumbnail-grid .empty-state {
    min-height: 300px;
  }
}

@media (max-width: 560px) {
  .app-container {
    padding: 0 12px;
  }

  .app-header {
    min-height: auto;
    flex-wrap: wrap;
    padding: 12px 0;
  }

  .logo {
    width: 100%;
  }

  header h1 {
    font-size: 21px;
  }

  .header-actions {
    width: 100%;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .btn-text {
    min-width: 0;
    width: 100%;
    padding: 0 10px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .product-hero {
    padding: 22px 18px 18px;
    border-radius: var(--radius-md);
  }

  .hero-copy h2 {
    font-size: 24px;
  }

  .hero-copy > p:not(.eyebrow) {
    font-size: 15px;
  }

  .feature-row {
    gap: 10px 12px;
    margin-top: 22px;
  }

  .feature-row > span {
    width: calc(50% - 6px);
    font-size: 13px;
  }

  .hero-visual {
    min-height: 180px;
  }

  .flying-card {
    width: 68px;
    height: 54px;
  }

  .pdf-sheet {
    right: 14px;
    width: 116px;
    height: 148px;
    padding: 22px 16px;
  }

  .pdf-sheet span {
    height: 34px;
    padding: 0 13px;
    font-size: 19px;
  }

  .upload-panel,
  .preview-panel,
  .export-panel {
    padding: 16px;
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
  }

  .image-count {
    width: fit-content;
  }

  .thumbnail-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .settings {
    grid-template-columns: 1fr;
  }

  .toast {
    width: calc(100% - 24px);
    text-align: center;
    white-space: normal;
  }
}

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