:root {
  color-scheme: light;
  --ink: #171717;
  --muted: #6b665f;
  --paper: #f7f4ee;
  --panel: #fffdf8;
  --line: #ded7cb;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --danger: #b42318;
  --shadow: 0 18px 50px rgba(48, 42, 34, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.08), transparent 34%),
    repeating-linear-gradient(90deg, rgba(23, 23, 23, 0.035) 0 1px, transparent 1px 84px),
    var(--paper);
  font-family: "Avenir Next", "Gill Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  border: 0;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  min-height: 42px;
  padding: 0 16px;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

button:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

.ghost {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
}

.ghost:hover {
  color: white;
  border-color: var(--accent-dark);
}

.danger {
  color: white;
  background: var(--danger);
}

.shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 40px 0;
}

.login-panel,
.upload-zone,
.library {
  background: rgba(255, 253, 248, 0.88);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.login-panel {
  max-width: 520px;
  margin: 10vh auto 0;
  padding: 32px;
}

.brand,
.topbar,
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  justify-content: flex-start;
  margin-bottom: 28px;
}

.mark {
  display: grid;
  width: 64px;
  height: 64px;
  place-items: center;
  border-radius: 8px;
  color: white;
  background: var(--accent);
  font-weight: 800;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 3rem;
  line-height: 0.98;
  letter-spacing: 0;
}

.topbar h1 {
  font-size: 2.2rem;
}

h2 {
  margin-bottom: 8px;
  font-size: 1.35rem;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 6px;
  font-size: 1rem;
  letter-spacing: 0;
}

.login-form,
.upload-zone form {
  display: grid;
  gap: 14px;
}

label span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.92rem;
}

input[type="text"],
input[type="password"],
input:not([type]) {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: white;
}

input[type="file"] {
  max-width: 100%;
}

.error,
.status {
  min-height: 22px;
  margin-bottom: 0;
}

.error {
  color: var(--danger);
}

.status {
  color: var(--accent-dark);
}

.topbar {
  margin-bottom: 26px;
}

.upload-zone {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: center;
  min-height: 190px;
  padding: 28px;
}

.upload-zone.is-dragging {
  border-color: var(--accent);
  box-shadow: 0 22px 60px rgba(15, 118, 110, 0.18);
}

.library {
  margin-top: 22px;
  padding: 28px;
}

.image-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.image-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.preview {
  display: block;
  aspect-ratio: 4 / 3;
  background:
    linear-gradient(45deg, #f0ede6 25%, transparent 25%),
    linear-gradient(-45deg, #f0ede6 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f0ede6 75%),
    linear-gradient(-45deg, transparent 75%, #f0ede6 75%);
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  background-size: 24px 24px;
}

.preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.meta {
  padding: 14px;
}

.muted {
  color: var(--muted);
  font-size: 0.88rem;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 12px;
}

.actions .danger {
  grid-column: 1 / -1;
}

.empty {
  margin: 24px 0 0;
  color: var(--muted);
}

@media (max-width: 760px) {
  .shell {
    width: min(100vw - 20px, 1120px);
    padding: 20px 0;
  }

  .topbar,
  .upload-zone,
  .section-head {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .upload-zone {
    display: grid;
    padding: 20px;
  }

  .brand,
  .topbar,
  .section-head {
    align-items: flex-start;
  }
}