:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel2: #1e222b;
  --line: #2a2f3a;
  --text: #e8eaed;
  --muted: #9aa2b1;
  --accent: #f4b942;
  --accent2: #6ea8fe;
  --err: #ff6b6b;
  --radius: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); height: 100vh; display: flex; flex-direction: column; }
.hidden { display: none !important; }
.screen { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.center { align-items: center; justify-content: center; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.err { color: var(--err); min-height: 18px; margin-top: 8px; font-size: 13px; }
button { cursor: pointer; border: none; border-radius: 8px; padding: 10px 16px;
  background: var(--accent); color: #201a08; font-weight: 600; font-size: 14px; }
button:hover { filter: brightness(1.06); }
button.link { background: none; color: var(--muted); padding: 6px 10px; font-weight: 500; }
button.link:hover { color: var(--text); }
input, textarea, select { background: var(--panel2); color: var(--text);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; font-size: 14px; font-family: inherit; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent2); }

/* Login */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.login-card { width: 340px; text-align: center; }
.login-card h1 { margin: 0 0 4px; }
.login-card input { width: 100%; margin: 18px 0 12px; }
.login-card button { width: 100%; }

/* Topbar */
.topbar { display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; border-bottom: 1px solid var(--line); background: var(--panel); }
.brand { font-weight: 700; }
.tag { background: var(--panel2); color: var(--accent); border: 1px solid var(--line);
  border-radius: 20px; padding: 2px 10px; font-size: 12px; margin-left: 8px; font-weight: 600; }

/* Picker */
.picker-wrap { padding: 40px; max-width: 900px; margin: 0 auto; width: 100%; }
.picker-wrap h2 { margin-bottom: 4px; }
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 28px; }
.cat-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; cursor: pointer; transition: 0.15s; }
.cat-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.cat-card h3 { margin: 0 0 6px; }
.cat-card p { margin: 0; color: var(--muted); font-size: 13px; }

/* Tools row (stylize) */
.tools-row { margin-top: 28px; }
.tool-card { background: linear-gradient(135deg, var(--panel), var(--panel2)); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; cursor: pointer; transition: 0.15s; max-width: 520px; }
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-card h3 { margin: 0 0 6px; }
.tool-card p { margin: 0; color: var(--muted); font-size: 13px; }

/* Stylize screen */
.stylize-wrap { flex: 1; display: grid; grid-template-columns: 340px 1fr; min-height: 0; }
.stylize-controls { padding: 24px; border-right: 1px solid var(--line); background: var(--panel); overflow-y: auto; }
.fld { display: block; font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.fld input, .fld select { width: 100%; margin-top: 6px; }
.stylize-controls button { width: 100%; margin-top: 6px; }
.stylize-preview { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 24px; overflow-y: auto; }
.preview-col h4 { margin: 0 0 10px; }
.preview-box { border: 1px dashed var(--line); border-radius: 10px; min-height: 320px; display: flex;
  align-items: center; justify-content: center; overflow: hidden; background: var(--panel2); }
.preview-box img { width: 100%; height: auto; display: block; }
.preview-box .dlwrap { padding: 10px; width: 100%; }

/* Persistent, clickable plans/credits status bar */
.usage-banner { flex-shrink: 0; padding: 8px 18px; font-size: 13px; font-weight: 600; cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 16px;
  background: var(--panel2); color: var(--text); border-bottom: 1px solid var(--line); }
.usage-banner:hover { filter: brightness(1.12); }
.usage-banner .view { color: var(--accent2); }
.usage-banner .sep { color: var(--muted); }
.usage-banner.warn { background: #4a3a12; color: #f4d58a; border-bottom-color: #6b5416; }
.usage-banner.warn .view { color: #f4d58a; }
.usage-banner.alert { background: #4a1616; color: #ffb3b3; border-bottom-color: #7a2222; }
.usage-banner.alert .view { color: #ffb3b3; }

/* Usage page */
.usage-wrap { padding: 40px; max-width: 820px; margin: 0 auto; width: 100%; overflow-y: auto; }
.budget-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.budget-top { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.budget-top .spend { font-size: 30px; font-weight: 700; }
.budget-top .of { color: var(--muted); font-size: 15px; }
.bar { height: 12px; background: var(--panel2); border-radius: 6px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--accent2); transition: width .3s; }
.bar.warn > span { background: var(--accent); }
.bar.alert > span { background: var(--err); }
.usage-note { color: var(--muted); font-size: 13px; margin-top: 10px; }
.usage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.stat .n { font-size: 24px; font-weight: 700; }
.stat .l { color: var(--muted); font-size: 13px; margin-top: 4px; }
.stat .sub { color: var(--muted); font-size: 12px; margin-top: 6px; }
.hf-balance { margin-top: 20px; }

/* Library (saved projects) */
.library-head { display: flex; align-items: center; justify-content: space-between; margin-top: 40px; gap: 16px; }
.library-head h2 { margin: 0; }
.library-head input { width: 280px; }
.library { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin-top: 14px; padding-bottom: 40px; }
.proj-card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px; cursor: pointer; transition: 0.15s; }
.proj-card:hover { border-color: var(--accent); }
.proj-card h4 { margin: 0 0 4px; font-size: 15px; }
.proj-card .meta { color: var(--muted); font-size: 12px; }
.proj-card .del { float: right; background: none; color: var(--muted); padding: 0 4px; font-size: 14px; }
.proj-card .del:hover { color: var(--err); }
.lib-empty { color: var(--muted); font-size: 14px; padding: 8px 0 40px; }

/* Prominent back button */
.brand-row { display: flex; align-items: center; gap: 14px; }
.backbtn { background: var(--panel2); color: var(--text); border: 1px solid var(--line); font-weight: 600; }
.backbtn:hover { border-color: var(--accent); background: var(--panel); }
button.ghost { background: var(--panel2); color: var(--text); border: 1px solid var(--line); font-weight: 600; }
button.ghost:hover { border-color: var(--accent2); }

/* Studio layout */
.studio-grid { flex: 1; display: grid; grid-template-columns: 1fr 420px; min-height: 0; }
.chat-col { display: flex; flex-direction: column; min-height: 0; border-right: 1px solid var(--line); }
.messages { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.msg { max-width: 82%; padding: 12px 14px; border-radius: 12px; line-height: 1.5; white-space: pre-wrap; }
.msg.user { align-self: flex-end; background: var(--accent2); color: #08183a; }
.msg.assistant { align-self: flex-start; background: var(--panel); border: 1px solid var(--line); }
.msg.thinking { color: var(--muted); font-style: italic; }
.composer { display: flex; gap: 10px; padding: 14px 20px; border-top: 1px solid var(--line); background: var(--panel); }
.composer textarea { flex: 1; resize: none; }

/* Panels column */
.panels-col { display: flex; flex-direction: column; min-height: 0; background: var(--panel); }
.panels-head { padding: 16px 18px 8px; border-bottom: 1px solid var(--line); }
.panels-head h3 { margin: 0 0 8px; }
.row { display: flex; gap: 10px; align-items: center; }
.mini { font-size: 12px; color: var(--muted); }
.mini select { padding: 6px 8px; margin-left: 6px; }
.panels { flex: 1; overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 14px; }
.panel-card { background: var(--panel2); border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
.panel-card .cap { font-size: 12px; color: var(--accent); font-weight: 600; margin-bottom: 6px; }
.panel-card textarea { width: 100%; font-size: 12px; margin-bottom: 8px; }
.panel-card .btns { display: flex; gap: 8px; flex-wrap: wrap; }
.panel-card .btns button { padding: 7px 10px; font-size: 12px; }
.panel-card .btns button.ghost { background: var(--panel); color: var(--text); border: 1px solid var(--line); }
.panel-img { width: 100%; border-radius: 8px; margin-top: 10px; display: block; }
.panel-status { font-size: 12px; color: var(--muted); margin-top: 8px; }
.ref-chip { font-size: 11px; color: var(--accent2); margin-top: 6px; }

.export-row { padding: 14px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 10px; }
.export-row input { width: 100%; }

/* Reference modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex;
  align-items: center; justify-content: center; z-index: 50; }
.modal-body { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  width: 720px; max-width: 92vw; max-height: 86vh; padding: 18px; overflow: hidden; display: flex; flex-direction: column; }
.modal-head { display: flex; gap: 8px; margin-bottom: 8px; }
.modal-head input { flex: 1; }
.ref-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; overflow-y: auto; margin-top: 10px; }
.ref-item { background: var(--panel2); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; cursor: pointer; }
.ref-item:hover { border-color: var(--accent); }
.ref-item img { width: 100%; height: 120px; object-fit: cover; display: block; }
.ref-item .meta { padding: 6px 8px; font-size: 10px; color: var(--muted); }