/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-page:       #f9f9f9;
  --bg-card:       #ffffff;
  --bg-soft:       #fff5f5;
  --bg-hover:      #ffecec;
  --border:        #eedede;
  --border-mid:    #e0c8c8;
  --text:          #1a1a1a;
  --text-sub:      #555555;
  --text-muted:    #999999;
  --red:           #e8394a;
  --red-dark:      #c42b3a;
  --red-light:     #ff6b7a;
  --red-soft:      rgba(232,57,74,0.10);
  --green:         #16a34a;
  --orange:        #d97706;
  --error:         #dc2626;
  --radius:        16px;
  --radius-sm:     10px;
  --shadow-sm:     0 1px 4px rgba(0,0,0,0.06), 0 2px 12px rgba(0,0,0,0.04);
  --shadow:        0 4px 20px rgba(0,0,0,0.08);
  --t:             0.18s ease;
}

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  color: var(--text);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.65;
  background: var(--bg-page);
  background-image: radial-gradient(ellipse 100% 50% at 50% -5%, rgba(232,57,74,0.06) 0%, transparent 65%);
}

a { color: var(--red); text-decoration: none; }
a:hover { color: var(--red-dark); text-decoration: underline; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }

/* ===== Layout ===== */
.page-wrapper {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

/* ===== Header ===== */
.site-header {
  text-align: center;
  padding: 60px 16px 40px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  margin-bottom: 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, #fff0f0, #ffe6e6);
  border: 1px solid rgba(232,57,74,0.18);
  color: var(--red);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-title {
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #1a1a1a 0%, #e8394a 55%, #c42b3a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
}

.site-subtitle {
  max-width: 580px;
  margin: 0 auto;
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.75;
}

/* ===== Card ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--t);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.10em;
}

.card-title svg { flex-shrink: 0; color: var(--red); opacity: 0.65; }

/* ===== Guest Count ===== */
.guest-count-card {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

#guest-count-text {
  flex: 1;
  min-width: 200px;
  color: var(--text-sub);
  font-size: 14px;
}

.count-num { font-weight: 800; color: var(--green); font-size: 16px; }
.count-num.warn { color: var(--orange); }
.count-num.exhausted { color: var(--error); }

.count-bar-wrap {
  flex: 1;
  min-width: 140px;
  height: 5px;
  background: #f0e0e0;
  border-radius: 999px;
  overflow: hidden;
}

.count-bar-fill {
  width: 0%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--red-light), var(--red));
  transition: width 0.5s cubic-bezier(.4,0,.2,1);
}

/* ===== Limit Banner ===== */
.limit-banner {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px 22px;
  margin-bottom: 14px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #fff8f8 0%, #fff2f2 100%);
  border: 1px solid rgba(232,57,74,0.16);
}

.limit-banner-icon {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ffe4e4, #ffd0d0);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--red);
}

.limit-banner-body { flex: 1; }

.limit-banner-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--red-dark);
  margin-bottom: 4px;
}

.limit-banner-desc {
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.7;
  margin-bottom: 14px;
}

.limit-banner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ===== Form ===== */
.form-group { margin-bottom: 16px; }

.form-group label {
  display: block;
  margin-bottom: 7px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-sub);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

input[type="text"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color var(--t), box-shadow var(--t);
}

input[type="text"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(232,57,74,0.09);
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23aaa' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

textarea { resize: vertical; min-height: 100px; }

/* ===== Prompt Wrap ===== */
.prompt-wrap { position: relative; }

.prompt-counter {
  position: absolute;
  bottom: 10px;
  right: 12px;
  font-size: 11px;
  color: var(--text-muted);
  pointer-events: none;
}

/* ===== Example Section (collapsible) ===== */
.example-section {
  margin-bottom: 18px;
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.example-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  background: var(--bg-soft);
  border: none;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-sub);
  text-align: left;
  transition: background var(--t), color var(--t);
  user-select: none;
}

.example-toggle:hover {
  background: #f0f0f0;
  color: var(--red);
}

.example-toggle-hint {
  margin-left: auto;
  font-size: 11px;
  font-weight: 400;
  color: var(--text-muted);
  opacity: 0.8;
}

.example-chevron {
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.example-section.open .example-chevron {
  transform: rotate(180deg);
}

.example-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 14px;
}

.example-section.open .example-body {
  max-height: 400px;
  padding: 12px 14px;
}

.example-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.example-tag {
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid var(--border-mid);
  background: #fff;
  color: var(--text-sub);
  font-size: 11.5px;
  cursor: pointer;
  transition: background var(--t), border-color var(--t), color var(--t), box-shadow var(--t);
  user-select: none;
  line-height: 1.5;
}

.example-tag:hover {
  background: var(--bg-soft);
  border-color: rgba(232,57,74,0.35);
  color: var(--red);
  box-shadow: 0 1px 4px rgba(232,57,74,0.10);
}

/* ===== Reference Image ===== */
.reference-upload-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border-mid);
  background: #fff;
  color: var(--text-sub);
  font-size: 13px;
  cursor: pointer;
  transition: border-color var(--t), background var(--t), color var(--t);
}

.reference-upload-label:hover {
  border-color: var(--red);
  background: var(--bg-soft);
  color: var(--red);
}

.reference-preview {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  background: #fafafa;
}

.reference-preview-card { display: grid; gap: 10px; }

.reference-preview-img {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.reference-preview-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--text-muted);
  font-size: 12px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--t);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--red-light) 0%, var(--red) 50%, var(--red-dark) 100%);
  color: #fff;
  box-shadow: 0 2px 10px rgba(232,57,74,0.28);
}

.btn-primary:hover {
  box-shadow: 0 4px 18px rgba(232,57,74,0.38);
  filter: brightness(1.04);
}

.btn-primary:active { filter: brightness(0.96); }

.btn-outline {
  background: #fff;
  color: var(--red);
  border: 1px solid rgba(232,57,74,0.30);
}

.btn-outline:hover {
  background: var(--bg-soft);
  border-color: var(--red);
}

.btn-ghost {
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: #f5f5f5;
  color: var(--text);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===== Generate Button ===== */
.generate-btn-wrap { margin-top: 6px; }

#generate-btn {
  width: 100%;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--red-light) 0%, var(--red) 50%, var(--red-dark) 100%);
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: 0 3px 14px rgba(232,57,74,0.28);
  transition: all var(--t);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

#generate-btn:hover {
  box-shadow: 0 6px 22px rgba(232,57,74,0.38);
  filter: brightness(1.04);
}

#generate-btn:active { filter: brightness(0.95); }

#generate-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===== Loading Spinner ===== */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

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

/* ===== Error Box ===== */
#error-box {
  padding: 14px 18px;
  margin-bottom: 14px;
  border-radius: var(--radius-sm);
  background: #fff5f5;
  border: 1px solid rgba(220,38,38,0.20);
  color: var(--error);
  font-size: 14px;
  line-height: 1.6;
}

/* ===== Result ===== */
.result-card-wrap { overflow: hidden; }

.result-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
}

/* ===== 生成进度条 ===== */
#gen-progress-wrap {
  padding: 20px 0 8px;
  text-align: center;
}

.gen-progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.gen-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), #a78bfa);
  border-radius: 99px;
  transition: width 0.4s ease;
}

.gen-progress-text {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

#result-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.result-img-wrap {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #f5f5f5;
  border: 1px solid var(--border);
}

.result-img-wrap img {
  width: 100%;
  display: block;
  transition: transform 0.3s ease;
}

.result-img-wrap:hover img { transform: scale(1.02); }

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

/* ===== Collapsible ===== */
.card-title.collapsible {
  cursor: pointer;
  user-select: none;
  margin-bottom: 0;
}

.toggle-arrow {
  color: var(--text-muted);
  transition: transform var(--t);
  margin-left: auto;
}

.open .toggle-arrow { transform: rotate(180deg); }

#config-body,
#history-body { margin-top: 18px; }

/* ===== Config ===== */
.config-hint {
  padding: 10px 14px;
  border-left: 3px solid var(--red);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  background: var(--bg-soft);
  color: var(--text-sub);
  font-size: 12px;
  line-height: 1.75;
  margin-bottom: 16px;
}

.config-status {
  display: inline-flex;
  align-items: center;
  margin-left: 8px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  text-transform: none;
  letter-spacing: 0;
  border: 1px solid transparent;
}

.config-status.active {
  color: var(--green);
  background: rgba(22,163,74,0.08);
  border-color: rgba(22,163,74,0.18);
}

.config-status.inactive {
  color: var(--text-muted);
  background: #f5f5f5;
  border-color: var(--border);
}

.config-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* ===== Referral ===== */
.referral-card { padding-top: 2px; }

.referral-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.referral-status {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fafafa;
  color: var(--text-muted);
  font-size: 12px;
}

/* ===== History ===== */
.history-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.history-empty {
  padding: 28px 0;
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
}

.history-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
  transition: box-shadow var(--t);
}

.history-item:hover { box-shadow: var(--shadow); }

.history-img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #f5f5f5;
  display: block;
}

.history-info { padding: 10px 12px 12px; }

.history-prompt {
  margin-bottom: 3px;
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-meta {
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 11px;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 9999;
  padding: 10px 20px;
  max-width: 90vw;
  transform: translateX(-50%) translateY(80px);
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.97);
  color: var(--text);
  font-size: 14px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.12);
  opacity: 0;
  white-space: nowrap;
  transition: transform 0.28s cubic-bezier(.4,0,.2,1), opacity 0.28s ease;
  backdrop-filter: blur(8px);
}

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

.toast-success { border-color: rgba(22,163,74,0.25); color: var(--green); }
.toast-error   { border-color: rgba(220,38,38,0.25); color: var(--error); }
.toast-warn    { border-color: rgba(217,119,6,0.25); color: var(--orange); }

/* ===== Footer ===== */
.site-footer {
  margin-top: 48px;
  padding: 28px 16px 16px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.site-footer a { color: var(--red); }
.site-footer a:hover { color: var(--red-dark); }

/* ===== Divider hint ===== */
.size-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 5px;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .site-header { padding: 40px 8px 28px; }
  .card { padding: 18px 16px; }
  .form-row { grid-template-columns: 1fr; }
  .limit-banner-actions { flex-direction: column; }
  .config-actions { flex-direction: column; }
  #result-images { grid-template-columns: 1fr; }
  .result-actions { flex-direction: column; }
  .history-list { grid-template-columns: 1fr 1fr; }
  .toast { white-space: normal; text-align: center; }
}

@media (max-width: 400px) {
  .history-list { grid-template-columns: 1fr; }
}