/* Metropolis — Papers theme, matching the main app's Art Deco dark palette */
:root {
  --bg: #0d0f12;
  --panel: #14181d;
  --panel-2: #1b2026;
  --text: #e8ecf0;
  --muted: #8a939d;
  --accent: #aab8c6;
  --accent-hi: #d6dee6;
  --accent-soft: rgba(170, 184, 198, 0.34);
  --accent-softer: rgba(170, 184, 198, 0.13);
  --danger: #cf5b46;
  --ok: #8fb3ad;
  --display: "Century Gothic", "Futura", "Twentieth Century",
             "Avenir Next", "Trebuchet MS", system-ui, sans-serif;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: clip;
  -webkit-user-select: none;
  user-select: none;
}

input, textarea { -webkit-user-select: text; user-select: text; }

/* ── Header ──────────────────────────────────────────────────────────────── */
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem; background: var(--panel); border-bottom: 1px solid var(--accent-softer);
  position: sticky; top: 0; z-index: 10;
}
header h1 {
  margin: 0; font-size: 1.3rem; font-weight: 600; color: var(--accent);
  font-family: var(--display);
}
.header-actions { display: flex; gap: 0.4rem; }
.header-btn {
  background: none; border: 1px solid var(--accent-soft); color: var(--accent);
  padding: 0.4rem 0.7rem; border-radius: 5px; cursor: pointer; font-size: 0.85rem;
}
.header-btn:hover { background: var(--accent-softer); color: var(--accent-hi); }

/* ── Toolbar ─────────────────────────────────────────────────────────────── */
#toolbar {
  padding: 0.7rem 1rem; background: var(--panel-2);
  border-bottom: 1px solid var(--accent-softer); position: sticky; top: 3.4rem; z-index: 9;
}
#search {
  width: 100%; background: var(--bg); border: 1px solid var(--accent-soft);
  color: var(--text); padding: 0.5rem 0.7rem; border-radius: 5px; font-size: 0.9rem;
  outline: none;
}
#search:focus { border-color: var(--accent); }
.tag-filters { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.5rem; }
.tag-filter {
  padding: 0.2rem 0.5rem; border-radius: 3px; cursor: pointer; font-size: 0.8rem;
  background: var(--accent-softer); color: var(--muted); border: none;
}
.tag-filter.active { background: var(--accent-soft); color: var(--text); }

/* ── Paper list ──────────────────────────────────────────────────────────── */
#paper-list { padding: 1rem; display: flex; flex-direction: column; gap: 0.6rem; }
.paper-card {
  background: var(--panel-2); border: 1px solid var(--accent-soft); border-radius: 8px;
  padding: 0.8rem; cursor: pointer; transition: border-color 0.15s;
}
.paper-card:hover { border-color: var(--accent); }
.paper-card h3 { margin: 0 0 0.3rem; font-size: 1rem; font-weight: 600; }
.paper-card .paper-type { font-size: 0.75rem; color: var(--accent); margin-bottom: 0.2rem; text-transform: uppercase; letter-spacing: 0.04em; }
.paper-card .authors { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.3rem; }
.paper-card .meta { font-size: 0.8rem; color: var(--muted); display: flex; gap: 0.6rem; flex-wrap: wrap; }
.paper-card .tags { display: flex; gap: 0.3rem; margin-top: 0.3rem; flex-wrap: wrap; }
.paper-card .tag {
  padding: 0.15rem 0.4rem; border-radius: 3px; font-size: 0.75rem;
  background: var(--accent-softer); color: var(--muted);
}
.empty { text-align: center; color: var(--muted); padding: 3rem 1rem; font-style: italic; }

/* ── Overlay / Detail ────────────────────────────────────────────────────── */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 100;
  display: flex; align-items: flex-start; justify-content: center;
  overflow-y: auto; padding: 2rem 1rem;
}
.overlay.hidden { display: none; }
.overlay-panel {
  background: var(--panel); border: 1px solid var(--accent-soft); border-radius: 10px;
  padding: 1.5rem; max-width: 800px; width: 100%; position: relative;
}
.close {
  position: absolute; top: 0.5rem; right: 0.7rem; background: none; border: none;
  color: var(--muted); font-size: 1.5rem; cursor: pointer; line-height: 1;
}
.close:hover { color: var(--text); }

#detail-content h2 { margin: 0 0 0.5rem; font-size: 1.2rem; }
.detail-meta { font-size: 0.85rem; color: var(--muted); margin-bottom: 1rem; display: flex; gap: 0.6rem; flex-wrap: wrap; }
.detail-abstract { font-size: 0.9rem; line-height: 1.5; margin-bottom: 1rem; }
.detail-tags { display: flex; gap: 0.3rem; flex-wrap: wrap; margin-bottom: 1rem; }
.detail-tag {
  padding: 0.2rem 0.5rem; border-radius: 3px; font-size: 0.8rem;
  background: var(--accent-softer); color: var(--muted);
  display: flex; align-items: center; gap: 0.3rem;
}
.detail-tag .remove-tag { cursor: pointer; color: var(--danger); font-weight: bold; }
.detail-actions { display: flex; gap: 0.5rem; margin-top: 1rem; }
.detail-actions button {
  padding: 0.4rem 0.8rem; border: 1px solid var(--accent-soft); border-radius: 5px;
  background: none; color: var(--accent); cursor: pointer; font-size: 0.85rem;
}
.detail-actions button:hover { background: var(--accent-softer); }
.detail-actions button.danger-btn,
.header-btn.danger-btn { border-color: var(--danger); color: var(--danger); }
.confirm-modal { max-width: 350px; text-align: center; }
.confirm-modal p { margin: 0 0 1rem; font-size: 0.95rem; line-height: 1.4; }
.confirm-actions { display: flex; gap: 0.5rem; justify-content: center; }
.cite-panel { margin-top: 1rem; padding: 0.8rem; background: var(--panel-2); border-radius: 6px; }
.cite-panel.hidden { display: none; }
.cite-style-picker { display: flex; gap: 0.3rem; margin-bottom: 0.5rem; flex-wrap: wrap; }
.cite-style-btn {
  padding: 0.3rem 0.6rem; border: 1px solid var(--accent-soft); border-radius: 4px;
  background: none; color: var(--accent); cursor: pointer; font-size: 0.8rem;
}
.cite-style-btn:hover { background: var(--accent-softer); }
.cite-output {
  background: var(--bg); padding: 0.6rem; border-radius: 4px; font-size: 0.85rem;
  white-space: pre-wrap; word-break: break-word; line-height: 1.4; margin: 0; color: var(--text);
}

/* ── PDF viewer ──────────────────────────────────────────────────────────── */
.pdf-viewer { width: 100%; height: 70vh; border: none; border-radius: 5px; margin-top: 1rem; }

/* ── Import modal ────────────────────────────────────────────────────────── */
.overlay-panel.import-modal { max-width: 450px; }
.import-modal h2 { margin: 0 0 1rem; font-size: 1.1rem; }
#import-form { display: flex; flex-direction: column; gap: 0.5rem; }
#import-input {
  width: 100%; background: var(--bg); border: 1px solid var(--accent-soft); color: var(--text);
  padding: 0.5rem; border-radius: 5px; font-size: 0.9rem; outline: none;
}
#import-input:focus { border-color: var(--accent); }
#import-submit {
  padding: 0.5rem 1rem; background: var(--accent-soft); color: var(--text);
  border: none; border-radius: 5px; cursor: pointer;
}
#import-result { margin-top: 1rem; font-size: 0.85rem; }

/* ── Phone tweaks ────────────────────────────────────────────────────────── */
@media (max-width: 520px) {
  header { padding: 0.7rem; }
  #toolbar { padding: 0.5rem 0.7rem; top: 3rem; }
  #paper-list { padding: 0.7rem; }
  .paper-card { padding: 0.6rem; }
  .overlay-panel { padding: 1rem; }
  header h1 { font-size: 1.1rem; }
}