:root {
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --ink-muted: #86868b;
  --ink-faint: #94a3b8;
  --subpage-primary: #0071e3;
  --subpage-primary-dark: #0077ed;
  --subpage-border: rgba(0, 0, 0, .06);
  --subpage-shadow: 0 4px 28px rgba(15, 23, 42, .05);
  --text-contrast-shadow: none;
}

html[data-theme="dark"] {
  --ink: #f5f5f7;
  --ink-soft: #a1a1a6;
  --ink-muted: #6e6e73;
  --ink-faint: #94a3b8;
  --subpage-border: rgba(255, 255, 255, .08);
  --subpage-shadow: 0 4px 24px rgba(0, 0, 0, .32);
  --text-contrast-shadow: none;
}

.upload-body {
  min-height: 100vh;
  color: var(--ink);
  background: #dce7f1 url('../assets/server-background.avif') center top / cover fixed !important;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.upload-body::before,
.upload-body::after {
  display: none !important;
}

html[data-theme="dark"] .upload-body {
  background: #14161b linear-gradient(rgba(18, 18, 20, .78), rgba(18, 18, 20, .86)), url('../assets/server-background.avif') center top / cover fixed !important;
}

.upload-shell, .upload-main {
  position: relative;
  width: min(1040px, calc(100% - 48px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 144px 0 84px;
}

/* Back Button Row - High z-index to guarantee clickability */
.upload-back-row {
  position: absolute;
  top: 112px;
  left: 0;
  z-index: 30;
  pointer-events: auto;
}

.back-link {
  position: relative;
  z-index: 31;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 7px 14px;
  border: 1px solid var(--line, rgba(255, 255, 255, 0.72));
  border-radius: 9999px !important;
  color: var(--ink-soft);
  background: var(--glass, rgba(250, 250, 252, .8));
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease, transform .2s ease, box-shadow .2s ease;
}

.back-link svg {
  width: 15px;
  height: 15px;
  color: var(--subpage-primary);
  transition: transform .2s ease;
}

.back-link:hover {
  color: var(--subpage-primary);
  border-color: rgba(0, 113, 227, .3);
  background: rgba(255, 255, 255, 0.95);
  transform: translateX(-2px);
  box-shadow: 0 4px 16px rgba(0, 113, 227, 0.15);
}

.back-link:hover svg {
  transform: translateX(-1px);
}

.back-link:active {
  transform: scale(.97);
}

html[data-theme="dark"] .back-link {
  background: rgba(24, 25, 27, 0.78);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--ink);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

html[data-theme="dark"] .back-link:hover {
  background: rgba(32, 34, 40, 0.9);
  border-color: rgba(59, 130, 246, 0.4);
  color: #60a5fa;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* Upload Card - Apple Frosted Glass */
.upload-card {
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  gap: 52px;
  margin-top: 16px;
  padding: 48px;
  border: 1px solid var(--line, rgba(255, 255, 255, .72));
  border-radius: 24px;
  background: var(--glass-gradient, var(--glass, rgba(250, 250, 252, .8)));
  box-shadow: var(--shadow-subtle, 0 10px 24px rgba(15, 23, 42, .05));
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  position: relative;
  z-index: 1;
}

html[data-theme="dark"] .upload-card {
  background: rgba(22, 22, 26, .82);
  border-color: rgba(255, 255, 255, .14);
  box-shadow: 0 16px 36px rgba(0, 0, 0, .4);
}

.upload-card-intro {
  align-self: center;
  padding: 10px 0;
}

.upload-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  margin-bottom: 24px;
  border-radius: 14px;
  color: #fff;
  background: var(--subpage-primary);
  box-shadow: 0 6px 16px rgba(0, 113, 227, .24);
}

.upload-icon svg {
  width: 23px;
  height: 23px;
}

.upload-card-intro .eyebrow {
  margin: 0 0 10px;
  color: var(--subpage-primary-dark);
  font-family: 'Quicksand', sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
}

.upload-card h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(38px, 4.5vw, 56px);
  font-weight: 750;
  letter-spacing: -.02em;
  line-height: 1.15;
}

.upload-card h1 em {
  color: var(--subpage-primary);
  font-style: normal;
}

.upload-card-intro > p:last-child {
  max-width: 330px;
  margin: 20px 0 0;
  color: var(--ink-soft);
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1.85;
}

/* Upload Form & Drop Zone */
.public-upload-form {
  display: grid;
  align-content: center;
  gap: 16px;
}

.public-drop-zone {
  display: grid;
  place-items: center;
  min-height: 210px;
  padding: 28px;
  border: 2px dashed rgba(0, 113, 227, 0.32);
  border-radius: 18px;
  text-align: center;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  cursor: pointer;
  transition: background .2s ease, transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.public-drop-zone:hover,
.public-drop-zone.dragging,
.public-drop-zone.has-file {
  background: rgba(255, 255, 255, 0.75);
  border-color: var(--subpage-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 113, 227, 0.12);
}

.public-drop-zone input {
  display: none;
}

.drop-image-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  border-radius: 50%;
  color: var(--subpage-primary);
  background: rgba(0, 113, 227, 0.12);
}

.drop-image-icon svg {
  width: 22px;
  height: 22px;
}

.public-drop-zone strong {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--ink);
  font-size: 14.5px;
  font-weight: 700;
}

.public-drop-zone small {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 550;
}

html[data-theme="dark"] .public-drop-zone {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.14);
}

html[data-theme="dark"] .public-drop-zone:hover,
html[data-theme="dark"] .public-drop-zone.dragging,
html[data-theme="dark"] .public-drop-zone.has-file {
  background: rgba(255, 255, 255, 0.08);
  border-color: #3b82f6;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

html[data-theme="dark"] .drop-image-icon {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
}

/* Form Fields - Frosted Clean Inputs */
.public-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 12px;
}

.public-fields label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: flex-start;
  color: var(--ink);
  font-size: 12px;
  font-weight: 650;
}

.public-field-wide {
  grid-column: 1 / -1;
}

.public-fields input {
  width: 100%;
  height: 48px;
  min-height: 48px;
  box-sizing: border-box;
  padding: 0 16px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 12px;
  outline: 0;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.65);
  box-shadow: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font: inherit;
  font-size: 13.5px;
  transition: border-color .2s ease, background .2s ease, box-shadow .2s ease;
}

.public-fields input::placeholder {
  color: #86868b;
}

.public-fields input:hover {
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(0, 0, 0, 0.14);
}

.public-fields input:focus {
  border-color: var(--subpage-primary);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12);
}

html[data-theme="dark"] .public-fields input {
  background: rgba(32, 34, 40, 0.65) !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  color: var(--ink) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] .public-fields input:hover {
  background: rgba(37, 40, 48, 0.85) !important;
  border-color: rgba(255, 255, 255, 0.16) !important;
}

html[data-theme="dark"] .public-fields input:focus {
  background: #272a33 !important;
  border-color: #3b82f6 !important;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2) !important;
}

/* Action Area */
.public-upload-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  margin-top: 4px;
}

.form-message {
  min-height: 18px;
  margin: 0;
  color: #34c759;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.5;
}

.form-message.error {
  color: #ff3b30;
}

.public-upload-actions .button {
  min-height: 44px;
  border-radius: 980px;
  font-weight: 650;
}

.public-upload-actions .button:disabled {
  cursor: not-allowed;
  opacity: .45;
}

.upload-footnote {
  display: flex;
  width: fit-content;
  margin: 22px auto 0;
  padding: 8px 18px;
  border-radius: 9999px;
  background: var(--glass, rgba(250, 250, 252, 0.72));
  border: 1px solid var(--line, rgba(255, 255, 255, 0.7));
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.03);
  justify-content: center;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 550;
}

.upload-footnote svg {
  width: 15px;
  color: #34c759;
}

html[data-theme="dark"] .upload-footnote {
  background: rgba(22, 22, 26, 0.72);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

/* Mobile Responsive */
@media (max-width: 760px) {
  .upload-shell, .upload-main {
    width: min(100% - 28px, 560px);
    padding-top: 108px;
    padding-bottom: 60px;
  }
  .upload-back-row {
    top: 80px;
  }
  .upload-card {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-top: 24px;
    padding: 24px 18px;
    border-radius: 22px;
  }
  .upload-card h1 {
    font-size: 38px;
  }
  .public-fields {
    grid-template-columns: 1fr;
  }
  .public-field-wide {
    grid-column: span 1;
  }
  .public-upload-actions {
    align-items: stretch;
    flex-direction: column;
  }
  .public-upload-actions .button {
    width: 100%;
  }
  .upload-footnote {
    align-items: flex-start;
    text-align: center;
  }
}