:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --border: #e3e5ea;
  --text: #1c1e21;
  --text-mute: #6b7280;
  --primary: #4f6df5;
  --primary-hover: #3a56d8;
  --success: #22a06b;
  --success-hover: #188a5a;
  --danger: #e5484d;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Malgun Gothic", -apple-system, sans-serif;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 1100px;
  margin: 0 auto;
  background: var(--panel);
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.06);
}

.topbar {
  padding: 20px 28px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 22px;
  margin: 0;
  background: linear-gradient(90deg, var(--primary), #8a5cf6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.3px;
}

.count-label {
  color: var(--text-mute);
  font-size: 14px;
}

.howto-card {
  margin: 16px 28px 0;
  padding: 18px 22px;
  border-radius: 16px;
  background: linear-gradient(135deg, #e4f7ec, #eef0fe);
  border: 1px solid #d6efe0;
}

.howto-card h2 {
  margin: 0 0 12px;
  font-size: 16px;
  color: var(--text);
}

.howto-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
}

.step-num {
  display: inline-flex;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--success);
  color: #fff;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  margin-right: 8px;
}

@media (prefers-color-scheme: dark) {
  .howto-card {
    background: linear-gradient(135deg, #16321f, #1b1e2e);
    border-color: #223a2b;
  }
}

.toolbar {
  padding: 16px 28px 0;
  display: flex;
  gap: 10px;
}

.tabs {
  display: flex;
  gap: 10px;
  padding: 16px 28px;
  background: linear-gradient(180deg, var(--panel), var(--bg));
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text-mute);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  transition: all 0.15s ease;
}

.tab-icon {
  font-size: 18px;
}

.tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 10px rgba(79, 109, 245, 0.35);
}

.tab-panel {
  display: none;
  flex: 1;
  flex-direction: column;
}

.tab-panel.active {
  display: flex;
}

.emoji-search {
  width: 100%;
  max-width: 420px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 14px;
}

.emoji-categories {
  display: flex;
  gap: 8px;
  padding: 14px 28px 0;
  overflow-x: auto;
}

.emoji-cat-btn {
  flex-shrink: 0;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-mute);
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}

.emoji-cat-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.emoji-grid {
  padding: 16px 28px 28px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 8px;
}

.emoji-btn {
  font-size: 26px;
  padding: 10px 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  cursor: pointer;
  transition: transform 0.1s ease, background 0.1s ease;
}

.emoji-btn:hover {
  background: #eef0fe;
  transform: scale(1.1);
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1c1e21;
  color: #fff;
  padding: 10px 18px;
  border-radius: 9px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s ease;
  z-index: 100;
}

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

img.emoji {
  height: 1em;
  width: 1em;
  margin: 0 0.05em 0 0.1em;
  vertical-align: -0.15em;
}

.seo-options {
  flex-direction: column;
  align-items: stretch;
  margin: 10px 28px 28px;
}

.seo-opt {
  max-width: 640px;
  width: 100%;
}

.seo-opt input[type="text"],
.seo-opt textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  background: var(--panel);
  color: var(--text);
}

.seo-meter {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-mute);
}

.seo-badge {
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.seo-badge.ok {
  background: #e4f7ec;
  color: var(--success);
}

.seo-badge.warn {
  background: #fff4de;
  color: #b8790a;
}

.seo-badge.bad {
  background: #fdeceb;
  color: var(--danger);
}

@media (prefers-color-scheme: dark) {
  .seo-badge.ok { background: #16321f; }
  .seo-badge.warn { background: #3a2c0d; }
  .seo-badge.bad { background: #3a1716; }
}


.section-title {
  margin: 20px 28px 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.options {
  padding: 18px 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  background: var(--panel);
  margin: 10px 28px 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.opt {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 200px;
}

.opt label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.opt .hint {
  font-size: 11px;
  color: var(--text-mute);
  opacity: 0.8;
}

.opt select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--panel);
  color: var(--text);
}

.opt-row {
  display: flex;
  gap: 8px;
}

.opt input[type="text"],
.opt input[type="number"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  min-width: 160px;
}

.opt input[type="range"] {
  width: 220px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
}

.opt .unit {
  font-size: 13px;
  color: var(--text-mute);
}

.opt input[type="color"] {
  width: 36px;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  cursor: pointer;
}

.card .thumb-wrap {
  position: relative;
  width: 100%;
  height: 150px;
  border-radius: 8px;
  overflow: hidden;
  background: #eee;
}

.card .thumb-wrap img.thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.wm-overlay {
  position: absolute;
  display: none;
  pointer-events: none;
}

.wm-text-overlay {
  font-weight: 700;
  white-space: nowrap;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.wm-logo-overlay {
  max-width: 90%;
}

.grid {
  flex: 1;
  padding: 20px 28px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  align-content: start;
}

.empty-hint {
  text-align: center;
  color: var(--text-mute);
  margin-top: 60px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.card .filename {
  font-size: 13px;
  color: var(--text-mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card .keyword-input {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}

.card .card-actions {
  display: flex;
  gap: 8px;
}

.nuki-toggle {
  flex: 1;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-mute);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.15s ease;
}

.nuki-toggle.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.remove-btn {
  width: 34px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--danger);
  cursor: pointer;
  font-size: 15px;
}

.remove-btn:hover {
  background: #fdeceb;
}

.btn {
  padding: 10px 18px;
  border-radius: 9px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary {
  background: #eef0fe;
  color: var(--primary);
}
.btn-secondary:hover { background: #dfe3fc; }

.btn-ghost {
  background: transparent;
  color: var(--text-mute);
  border-color: var(--border);
}
.btn-ghost:hover { background: #f0f1f3; }

.btn-success {
  background: var(--success);
  color: #fff;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.btn-success:hover { background: var(--success-hover); }

.btn-lg {
  padding: 13px 26px;
  font-size: 15px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.actionbar {
  position: sticky;
  bottom: 0;
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 16px 28px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.progress-wrap {
  flex: 1;
  height: 10px;
  background: #eceef2;
  border-radius: 6px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width 0.2s ease;
}

.status-text {
  font-size: 13px;
  color: var(--text-mute);
  min-width: 160px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15161a;
    --panel: #1f2026;
    --border: #2d2f36;
    --text: #e8e9ec;
    --text-mute: #9aa0ac;
  }
  .card .thumb-wrap { background: #2a2b31; }
  .nuki-toggle { background: #26272d; color: var(--text-mute); }
  .remove-btn { background: #26272d; }
  .opt input, .card .keyword-input { background: #26272d; color: var(--text); }
}

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px;
  }
  .topbar h1 { font-size: 19px; }

  .howto-card { margin: 12px 16px 0; padding: 16px; }

  .tabs {
    padding: 12px 16px;
    gap: 8px;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
  }
  .tab-btn { padding: 10px 16px; font-size: 14px; flex-shrink: 0; }

  .toolbar { padding: 12px 16px 0; }

  .options { margin: 10px 16px 0; padding: 14px 16px; gap: 16px; }
  .opt { min-width: 100%; }
  .opt-row { flex-wrap: wrap; }
  .opt input[type="range"] { width: 100%; }

  .section-title { margin: 16px 16px 0; }

  .grid { padding: 16px; gap: 12px; }

  .actionbar {
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 10px;
  }
  .actionbar .progress-wrap { order: 3; width: 100%; }
  .actionbar .status-text { order: 4; width: 100%; min-width: 0; }
  #pickFolderBtn, #startBtn, #downloadBtn {
    flex: 1 1 auto;
    justify-content: center;
    text-align: center;
  }
  #folderLabel { width: 100%; order: 2; }

  .emoji-search { max-width: 100%; }
  .emoji-categories { padding: 12px 16px 0; }
  .emoji-grid { padding: 12px 16px 20px; grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); }

  .seo-options { margin: 10px 16px 20px; }
}