:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --panel: #ffffff;
  --ink: #172026;
  --muted: #5f6f7a;
  --line: #d8e0e5;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --accent-soft: #dff5f1;
  --danger: #b42318;
  --shadow: 0 18px 50px rgba(23, 32, 38, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
}

.upload-panel {
  display: flex;
  flex-direction: column;
  gap: 22px;
  width: 100%;
  min-height: 100vh;
  padding: 28px clamp(20px, 4vw, 56px);
  background: var(--panel);
}

.brand-row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  align-items: center;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.95), rgba(57, 130, 181, 0.9)),
    #0f766e;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.36);
}

h1 {
  margin: 0 0 4px;
  font-size: 1.35rem;
  line-height: 1.15;
  letter-spacing: 0;
}

p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.upload-form {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
}

.drop-zone {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 240px;
  padding: 24px;
  text-align: center;
  border: 1px dashed #9fb0ba;
  border-radius: 8px;
  background: #fbfcfc;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.drop-zone:hover,
.drop-zone.is-dragging,
body.is-dragging .drop-zone {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-zone:focus-within {
  outline: 3px solid rgba(15, 118, 110, 0.22);
  outline-offset: 2px;
}

.drop-zone input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.drop-icon {
  display: grid;
  place-items: center;
  width: 58px;
  height: 46px;
  margin-bottom: 14px;
  border-radius: 6px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  font-size: 0.82rem;
  font-weight: 800;
}

.drop-title {
  display: block;
  margin-bottom: 4px;
  font-size: 1.05rem;
  font-weight: 750;
}

.drop-detail {
  display: block;
  max-width: 100%;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.form-actions {
  display: flex;
  width: 100%;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

button {
  width: 100%;
  min-height: 58px;
  padding: 0 24px;
  border: 0;
  border-radius: 6px;
  color: #ffffff;
  background: var(--accent);
  font-size: 1.05rem;
  font-weight: 750;
  cursor: pointer;
  transition: background 160ms ease, box-shadow 160ms ease;
}

button:hover:not(:disabled) {
  background: var(--accent-dark);
}

button:disabled {
  color: #73818a;
  background: #e1e7ea;
  cursor: not-allowed;
}

button:focus-visible {
  outline: 3px solid #172026;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(15, 118, 110, 0.2);
}

.progress-wrap {
  display: grid;
  gap: 10px;
}

.progress-bar {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: #e3e9ec;
}

.progress-bar span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #3982b5);
  transition: width 160ms ease;
}

#status-text.is-error {
  color: var(--danger);
}

@media (max-width: 860px) {
  .drop-zone {
    min-height: 220px;
  }
}

@media (max-width: 520px) {
  .upload-panel {
    padding: 20px;
  }

  .brand-row {
    grid-template-columns: 36px 1fr;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .drop-zone {
    min-height: 180px;
  }
}