:root {
  --ink: #12241f;
  --ink-soft: #3d524b;
  --paper: #f3f7f4;
  --mint: #1f8a70;
  --mint-deep: #146353;
  --mint-glow: rgba(31, 138, 112, 0.22);
  --sand: #e8f0eb;
  --line: rgba(18, 36, 31, 0.12);
  --danger: #b42318;
  --ok: #146353;
  --shadow: 0 24px 60px rgba(18, 36, 31, 0.12);
  --radius: 22px;
  --font-display: "Sora", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "Sora", sans-serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: #dfeae4;
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(31, 138, 112, 0.28), transparent 60%),
    radial-gradient(700px 420px at 90% 10%, rgba(245, 196, 120, 0.35), transparent 55%),
    linear-gradient(160deg, #eef5f1 0%, #d7e6de 45%, #c9ddd4 100%);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(18, 36, 31, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 36, 31, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(640px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2.5rem, 8vh, 5rem) 0 3rem;
  animation: rise 0.7s ease both;
  transition: width 0.25s ease;
}

.shell.has-preview {
  width: min(860px, calc(100% - 2rem));
}

.preview-section {
  margin-top: 1.25rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  background: rgba(243, 247, 244, 0.92);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  animation: rise 0.45s ease both;
}

.preview-head {
  margin-bottom: 1rem;
}

.preview-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.preview-guide {
  margin: 0.4rem 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.preview-grid {
  display: grid;
  gap: 1.1rem;
}

.preview-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.85rem;
  overflow: hidden;
}

.preview-card img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  background: #f7faf8;
  cursor: context-menu;
}

.preview-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.preview-card-meta span {
  font-weight: 600;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.btn-save {
  font-family: var(--font-body);
  border: none;
  cursor: pointer;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  background: var(--mint);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
}

.btn-save:hover {
  background: var(--mint-deep);
}

.preview-tip {
  margin: 0.45rem 0 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brand {
  text-align: center;
  margin-bottom: 1.75rem;
}

.replace-form {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.1rem;
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field span {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.field input[type="text"] {
  width: 100%;
  min-height: 46px;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.85);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  outline: none;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.field input[type="text"]:focus {
  border-color: var(--mint);
  box-shadow: 0 0 0 4px var(--mint-glow);
}

.field-inline {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.field-inline input[type="color"] {
  width: 52px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  cursor: pointer;
}

.check input {
  margin-top: 0.2rem;
  accent-color: var(--mint-deep);
}

.logo {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8vw, 3.6rem);
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
}

.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3vw, 1.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mint-deep);
}

.tagline {
  margin: 0.65rem 0 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.dropzone {
  display: grid;
  justify-items: center;
  gap: 0.55rem;
  padding: 2.1rem 1.4rem 1.6rem;
  border: 1.5px dashed rgba(20, 99, 83, 0.35);
  border-radius: var(--radius);
  background: rgba(243, 247, 244, 0.78);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition:
    border-color 0.25s ease,
    background 0.25s ease,
    transform 0.25s ease;
}

.dropzone:hover,
.dropzone:focus-visible {
  outline: none;
  border-color: var(--mint);
  background: rgba(243, 247, 244, 0.95);
  transform: translateY(-2px);
}

.dropzone.dragover {
  border-color: var(--mint);
  background: rgba(232, 240, 235, 0.95);
  box-shadow: 0 0 0 6px var(--mint-glow), var(--shadow);
}

.dropzone.has-file {
  display: none;
}

.dropzone-visual {
  position: relative;
  width: 78px;
  height: 78px;
  margin-bottom: 0.35rem;
}

.sheet {
  position: absolute;
  inset: 10px 14px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 20px rgba(18, 36, 31, 0.08);
}

.sheet-a {
  transform: rotate(-8deg) translateX(-4px);
  animation: floatA 3.2s ease-in-out infinite;
}

.sheet-b {
  transform: rotate(7deg) translateX(6px);
  background: linear-gradient(180deg, #fff 0%, #f6fbf8 100%);
  animation: floatB 3.2s ease-in-out infinite;
}

.sheet-b::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  top: 18px;
  height: 4px;
  border-radius: 999px;
  background: rgba(31, 138, 112, 0.35);
  box-shadow:
    0 10px 0 rgba(18, 36, 31, 0.08),
    0 20px 0 rgba(18, 36, 31, 0.08);
}

@keyframes floatA {
  0%,
  100% {
    transform: rotate(-8deg) translateX(-4px) translateY(0);
  }
  50% {
    transform: rotate(-10deg) translateX(-6px) translateY(-4px);
  }
}

@keyframes floatB {
  0%,
  100% {
    transform: rotate(7deg) translateX(6px) translateY(0);
  }
  50% {
    transform: rotate(9deg) translateX(8px) translateY(-3px);
  }
}

.dropzone-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}

.dropzone-hint {
  margin: 0 0 0.45rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.panel {
  margin-top: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  background: rgba(243, 247, 244, 0.9);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  animation: rise 0.45s ease both;
}

.file-meta {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.9rem;
  align-items: center;
}

.file-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(160deg, var(--mint), var(--mint-deep));
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.file-name {
  margin: 0;
  font-weight: 700;
  word-break: break-all;
}

.file-size {
  margin: 0.25rem 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.actions {
  margin-top: 1.1rem;
}

.actions-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 520px) {
  .actions-dual {
    grid-template-columns: 1fr;
  }
}

.btn-primary.btn-image {
  background: linear-gradient(135deg, #2a9d8f 0%, #1a6b5c 100%);
}

.btn-primary.btn-convert {
  background: linear-gradient(135deg, #3d7ea6 0%, #245875 100%);
  box-shadow: 0 12px 28px rgba(36, 88, 117, 0.22);
}

.action-hint {
  margin: 0.55rem 0 0;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.field select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.55rem 0.8rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

.btn-primary,
.btn-secondary,
.btn-ghost {
  font-family: var(--font-body);
  border: none;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    background 0.2s ease,
    opacity 0.2s ease;
}

.btn-primary {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--mint) 0%, var(--mint-deep) 100%);
  color: #fff;
  font-size: 1.02rem;
  font-weight: 700;
  box-shadow: 0 12px 28px var(--mint-glow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: wait;
}

.btn-secondary {
  margin-top: 0.2rem;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  background: var(--sand);
  color: var(--mint-deep);
  font-weight: 600;
}

.btn-secondary:hover {
  background: #dce8e1;
}

.btn-ghost {
  padding: 0.4rem 0.7rem;
  border-radius: 10px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.btn-ghost:hover {
  background: rgba(18, 36, 31, 0.06);
  color: var(--ink);
}

.btn-spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  display: none;
  animation: spin 0.7s linear infinite;
}

.btn-primary.loading .btn-spinner {
  display: block;
}

.btn-primary.loading .btn-label {
  opacity: 0.92;
}

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

.progress {
  margin-top: 1rem;
}

.progress-track {
  height: 8px;
  border-radius: 999px;
  background: rgba(18, 36, 31, 0.08);
  overflow: hidden;
}

.progress-bar {
  width: 18%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--mint), #3cb897);
  animation: progressPulse 1.4s ease-in-out infinite;
}

@keyframes progressPulse {
  0% {
    width: 18%;
    transform: translateX(0);
  }
  50% {
    width: 62%;
    transform: translateX(20%);
  }
  100% {
    width: 18%;
    transform: translateX(120%);
  }
}

.progress-text {
  margin: 0.55rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.status {
  margin: 0.9rem 0 0;
  min-height: 1.25rem;
  font-size: 0.92rem;
}

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

.status.success {
  color: var(--ok);
}

.footer {
  margin-top: 1.4rem;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.footer p {
  margin: 0;
}

@media (max-width: 520px) {
  .file-meta {
    grid-template-columns: auto 1fr;
  }

  .btn-ghost {
    grid-column: 1 / -1;
    justify-self: start;
  }
}