/* Image Prompt Guru —— 深色主题，无框架，纯手写 */
:root {
  --bg: #0b0f17;
  --bg-soft: #111726;
  --card: #141c2e;
  --card-2: #182238;
  --border: #253352;
  --text: #e8edf7;
  --text-dim: #93a1bd;
  --accent: #6d8cff;
  --accent-2: #9a6dff;
  --green: #3ecf8e;
  --red: #ff6b6b;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(1200px 500px at 50% -10%, #1a2540 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
.container { max-width: 880px; margin: 0 auto; padding: 0 20px; }

/* header */
header { padding: 18px 0; }
.nav { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; text-decoration: none; color: var(--text); }
.logo .mark {
  width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; font-size: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.logo-img {
  width: 24px; height: 24px; border-radius: 50%; object-fit: cover; display: block;
  border: 1px solid var(--border);
}
.lang-switch {
  color: var(--text-dim); text-decoration: none; font-size: 14px;
  border: 1px solid var(--border); padding: 6px 12px; border-radius: 999px;
}
.lang-switch:hover { color: var(--text); border-color: var(--accent); }

/* hero */
.hero { text-align: center; padding: 34px 0 22px; }
.hero h1 { font-size: clamp(26px, 5vw, 40px); line-height: 1.25; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--text-dim); margin-top: 12px; font-size: 15px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 18px; }
.chip {
  font-size: 12.5px; color: var(--text-dim); background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: 999px; padding: 5px 12px;
}

/* generator card */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; margin-top: 10px;
}
.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tab {
  flex: 1; text-align: center; padding: 10px; border-radius: 10px; cursor: pointer;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text-dim); font-size: 14.5px; font-weight: 600;
  transition: all 0.15s;
}
.tab.active {
  background: linear-gradient(135deg, rgba(109, 140, 255, 0.18), rgba(154, 109, 255, 0.18));
  border-color: var(--accent); color: var(--text);
}

/* dropzone */
.dropzone {
  border: 2px dashed var(--border); border-radius: 12px; padding: 34px 16px;
  text-align: center; cursor: pointer; transition: all 0.15s; color: var(--text-dim);
}
.dropzone:hover, .dropzone.dragover { border-color: var(--accent); background: rgba(109, 140, 255, 0.06); color: var(--text); }
.dropzone .icon { display: block; text-align: center; margin-bottom: 8px; }
.tab-icon { vertical-align: -3px; margin-right: 5px; }
.dropzone small { display: block; margin-top: 6px; font-size: 12px; color: var(--text-dim); }
.preview-wrap { display: none; position: relative; }
.preview-wrap img { max-width: 100%; max-height: 320px; border-radius: 12px; display: block; margin: 0 auto; }
.remove-btn {
  position: absolute; top: 10px; right: 10px; width: 30px; height: 30px; border-radius: 50%;
  border: none; cursor: pointer; font-size: 15px; color: #fff;
  background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(4px);
}

/* url mode */
.url-row { display: flex; gap: 10px; margin-top: 12px; }
.url-row input {
  flex: 1; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 14px; color: var(--text); font-size: 14px; outline: none;
}
.url-row input:focus { border-color: var(--accent); }

/* text mode */
textarea#text-input {
  width: 100%; min-height: 120px; resize: vertical; border-radius: 12px;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  padding: 12px 14px; font-size: 14.5px; font-family: inherit; outline: none;
}
textarea#text-input:focus { border-color: var(--accent); }

/* controls */
.controls { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0; }
@media (max-width: 560px) { .controls { grid-template-columns: 1fr; } }
.field label { display: block; font-size: 12.5px; color: var(--text-dim); margin-bottom: 6px; font-weight: 600; }
.field select {
  width: 100%; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; color: var(--text); font-size: 14px; outline: none; appearance: auto;
}

/* generate button */
.generate-btn {
  width: 100%; padding: 13px; border: none; border-radius: 12px; cursor: pointer;
  font-size: 15.5px; font-weight: 700; color: #fff;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: opacity 0.15s, transform 0.1s;
}
.generate-btn:hover { opacity: 0.92; }
.generate-btn:active { transform: scale(0.99); }
.generate-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* result */
.result-wrap { margin-top: 18px; display: none; }
.result-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.result-head .label { font-size: 13px; font-weight: 700; color: var(--text-dim); }
.copy-btn {
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
  border-radius: 8px; padding: 6px 14px; cursor: pointer; font-size: 13px;
}
.copy-btn:hover { border-color: var(--accent); }
.copy-btn.ok { color: var(--green); border-color: var(--green); }
#result-output {
  width: 100%; min-height: 110px; max-height: 320px; overflow: auto; white-space: pre-wrap; word-break: break-word;
  background: var(--card-2); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px; font-size: 14px; line-height: 1.7; color: var(--text); font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
}

/* error / notice */
.notice {
  display: none; margin-top: 14px; padding: 10px 14px; border-radius: 10px; font-size: 13.5px;
  background: rgba(255, 107, 107, 0.1); border: 1px solid rgba(255, 107, 107, 0.4); color: #ffb3b3;
}

/* history */
.history-section { margin-top: 26px; }
.history-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.history-head h2 { font-size: 15px; color: var(--text-dim); }
.history-head button {
  border: none; background: none; color: var(--text-dim); font-size: 13px; cursor: pointer;
}
.history-head button:hover { color: var(--red); }
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item {
  display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px;
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px;
}
.history-item .meta { font-size: 11px; color: var(--text-dim); white-space: nowrap; padding-top: 3px; }
.history-item p {
  flex: 1; font-size: 13px; color: var(--text-dim); overflow: hidden;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}
.history-item .copy-btn { white-space: nowrap; font-size: 12px; padding: 4px 10px; }
.empty-hint { color: var(--text-dim); font-size: 13.5px; text-align: center; padding: 14px; }

/* FAQ */
.faq { margin-top: 36px; }
.faq h2 { font-size: 18px; margin-bottom: 12px; }
.faq details {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; margin-bottom: 8px;
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 14.5px; }
.faq details p { color: var(--text-dim); font-size: 13.5px; margin-top: 8px; }

footer { margin: 40px 0 30px; text-align: center; color: var(--text-dim); font-size: 13px; }
footer a { color: var(--text-dim); }
footer a:hover { color: var(--accent); }