/* -----------------------------------------------------------------------
   llm_chat_ui — main.css
   Mobile-first. Dark theme. Calm, neutral palette.
   ----------------------------------------------------------------------- */

/* --- Reset + base ---------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #1c1917;
  --surface:    #292524;
  --border:     #44403c;
  --text:       #e7e5e4;
  --text-muted: #a8a29e;
  --accent:     #d6d3d1;
  --btn-fg:     #1c1917;
  --error:      #f87171;
  --radius:     6px;
  --font:       system-ui, -apple-system, sans-serif;
  --mono:       ui-monospace, monospace;
}

html, body { height: 100%; }
body { font-family: var(--font); background: var(--bg); color: var(--text);
       font-size: 15px; line-height: 1.5; }

/* --- Login page ------------------------------------------------------ */
.login-body { display: flex; align-items: center; justify-content: center;
              min-height: 100vh; padding: 1rem; }

.login-box { background: var(--surface); border: 1px solid var(--border);
             border-radius: var(--radius); padding: 2rem; width: 100%;
             max-width: 360px; }

.login-title { font-size: 1.25rem; font-weight: 600; margin-bottom: 1.5rem; }

.form-group { display: flex; flex-direction: column; gap: .25rem;
              margin-bottom: 1rem; }

.form-group label { font-size: .875rem; color: var(--text-muted); }

.form-group input { padding: .5rem .75rem; border: 1px solid var(--border);
                    border-radius: var(--radius); font-size: .9rem;
                    background: var(--bg); color: var(--text); outline: none; }

.form-group input:focus { border-color: var(--accent); }

.error { color: var(--error); font-size: .875rem; margin-bottom: 1rem; }

/* --- App layout ------------------------------------------------------ */
.topbar { display: flex; align-items: center; justify-content: space-between;
          height: 48px; padding: 0 1rem; background: var(--surface);
          border-bottom: 1px solid var(--border); }

.app-name { font-weight: 600; font-size: .95rem; }

.layout { display: flex; height: calc(100vh - 48px); overflow: hidden; }

/* --- Sidebar --------------------------------------------------------- */
.sidebar { display: none; flex-direction: column; width: 240px; min-width: 240px;
           border-right: 1px solid var(--border); background: var(--surface);
           overflow-y: auto; }

@media (min-width: 640px) { .sidebar { display: flex; } }

.sidebar-header { padding: .75rem; border-bottom: 1px solid var(--border); }

/* Session list */
#session-list { list-style: none; padding: 0; margin: 0; }

.session-item { position: relative; display: flex; flex-direction: column;
                gap: .125rem; padding: .625rem .75rem;
                border-bottom: 1px solid var(--border); }

.session-item:hover { background: var(--bg); }
.session-item--active { background: var(--bg); }

.session-link { text-decoration: none; color: inherit;
                display: flex; flex-direction: column; gap: .125rem; }

.session-name { font-size: .875rem; white-space: nowrap; overflow: hidden;
                text-overflow: ellipsis; }

/* Provider / model subtitle */
.session-meta { font-size: .7rem; color: var(--text-muted);
                white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Inline rename (contenteditable) */
.session-name-edit { display: none; font-size: .875rem; color: var(--text);
                     cursor: text; }

.session-item--active .session-name-edit { display: block; }
.session-item--active .session-link      { display: none; }

/* Delete button — right-aligned, hover only */
.btn-delete { position: absolute; top: .5rem; right: .5rem;
              background: none; border: none; cursor: pointer;
              color: var(--text-muted); font-size: .8rem; padding: .125rem .25rem;
              opacity: 0; transition: opacity .1s; line-height: 1; }

.session-item:hover .btn-delete { opacity: 1; }
.btn-delete:hover { color: var(--error); }

/* --- Model selector -------------------------------------------------- */
.model-selector { margin-bottom: .5rem; }

.model-selector summary { display: inline-block; cursor: pointer; list-style: none;
                           font-size: .75rem; color: var(--text-muted);
                           background: var(--surface); border: 1px solid var(--border);
                           border-radius: 999px; padding: .125rem .625rem;
                           user-select: none; }

.model-selector summary:hover { color: var(--text); }
.model-selector summary::-webkit-details-marker { display: none; }

.model-selector form { display: grid; grid-template-columns: 1fr 1fr auto;
                        gap: .5rem; align-items: end;
                        margin-top: .5rem; padding: .75rem;
                        background: var(--surface); border: 1px solid var(--border);
                        border-radius: var(--radius); }

.model-selector label { display: flex; flex-direction: column;
                         gap: .25rem; font-size: .8rem; color: var(--text-muted); }

.model-selector select,
.model-selector input[type="text"] {
  padding: .375rem .5rem; border: 1px solid var(--border);
  border-radius: var(--radius); font-size: .85rem;
  background: var(--bg); color: var(--text); outline: none;
}

.model-selector select:focus,
.model-selector input[type="text"]:focus { border-color: var(--accent); }

/* --- Chat content area ---------------------------------------------- */
.content { flex: 1; display: flex; flex-direction: column; overflow: hidden;
           max-width: 800px; padding: 0 1rem; }

.message-thread { flex: 1; overflow-y: auto; padding: 1rem 0;
                  display: flex; flex-direction: column; gap: .75rem; }

.message { max-width: 680px; }

.message--user { background: var(--surface); padding: .75rem 1rem;
                 border-radius: var(--radius); border: 1px solid var(--border); }

.message--assistant { padding: .25rem 0; }

.message-content { white-space: pre-wrap; word-break: break-word; }

/* Markdown-rendered content */
.md-content { white-space: normal; word-break: break-word; }

.md-content h1, .md-content h2, .md-content h3,
.md-content h4, .md-content h5, .md-content h6 {
  margin: 1rem 0 .5rem; font-weight: 600; line-height: 1.3;
}
.md-content h1 { font-size: 1.25rem; }
.md-content h2 { font-size: 1.1rem; }
.md-content h3 { font-size: 1rem; }

.md-content p { margin: .5rem 0; }

.md-content ul, .md-content ol { padding-left: 1.5rem; margin: .5rem 0; }
.md-content li { margin: .25rem 0; }

.md-content code { font-family: var(--mono); font-size: .875rem;
                   background: var(--bg); padding: .125rem .375rem;
                   border-radius: 3px; }

.md-content pre { background: var(--bg); border: 1px solid var(--border);
                  border-radius: var(--radius); padding: .75rem 1rem;
                  overflow-x: auto; margin: .75rem 0; }

.md-content pre code { background: none; padding: 0; font-size: .85rem; }

.md-content table { border-collapse: collapse; width: 100%; margin: .75rem 0;
                    font-size: .9rem; }

.md-content th, .md-content td { border: 1px solid var(--border);
                                  padding: .375rem .75rem; text-align: left; }

.md-content th { background: var(--surface); font-weight: 600; }

.md-content blockquote { border-left: 3px solid var(--border);
                          padding-left: .75rem; color: var(--text-muted);
                          margin: .5rem 0; }

.md-content a { color: var(--accent); }
.md-content hr { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }

/* --- Tool badges ---------------------------------------------------- */
.tool-badges { display: flex; flex-wrap: wrap; gap: .25rem; margin-top: .5rem; }

.tool-badge { font-family: var(--mono); font-size: .75rem;
              color: var(--text-muted); background: var(--bg);
              border: 1px solid var(--border); padding: .125rem .375rem;
              border-radius: 4px; }

/* --- Spinner -------------------------------------------------------- */
.htmx-indicator { display: none; }
.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator { display: block; }

.spinner { color: var(--text-muted); font-size: .875rem; padding: .5rem 0; }

/* --- Prompt form ---------------------------------------------------- */
.prompt-form { display: flex; flex-direction: column; gap: .5rem; padding: .75rem 0;
               border-top: 1px solid var(--border); margin-top: auto; }

.prompt-form textarea { flex: 1; resize: none; padding: .5rem .75rem;
                        border: 1px solid var(--border); border-radius: var(--radius);
                        font-family: var(--font); font-size: .9rem; outline: none;
                        background: var(--surface); color: var(--text); }

.prompt-form textarea:focus { border-color: var(--accent); }

.prompt-actions { display: flex; align-items: center; gap: .5rem; justify-content: flex-end; }

/* File attach button */
.btn-attach { display: inline-flex; align-items: center; justify-content: center;
              width: 32px; height: 32px; cursor: pointer;
              border: 1px solid var(--border); border-radius: var(--radius);
              background: var(--surface); color: var(--text-muted);
              font-size: 1rem; user-select: none; }

.btn-attach:hover { border-color: var(--accent); color: var(--text); }

.file-input-hidden { display: none; }

.file-label { font-size: .75rem; color: var(--text-muted); white-space: nowrap;
              overflow: hidden; text-overflow: ellipsis; max-width: 160px; }

.btn-file-clear { background: none; border: none; cursor: pointer;
                  color: var(--text-muted); font-size: .8rem; padding: .125rem .25rem;
                  line-height: 1; }
.btn-file-clear:hover { color: var(--error); }

/* --- Buttons -------------------------------------------------------- */
.btn-primary { padding: .5rem 1rem; background: var(--accent); color: var(--btn-fg);
               border: none; border-radius: var(--radius); cursor: pointer;
               font-size: .875rem; white-space: nowrap; }

.btn-primary:hover { opacity: .85; }

.btn-link { background: none; border: none; cursor: pointer; color: var(--text-muted);
            font-size: .875rem; padding: .25rem .5rem; }

.btn-link:hover { color: var(--text); }

.btn-new-session { width: 100%; padding: .5rem; background: none;
                   border: 1px dashed var(--border); border-radius: var(--radius);
                   cursor: pointer; font-size: .875rem; color: var(--text-muted); }

.btn-new-session:hover { border-color: var(--text-muted); color: var(--text); }

.no-session-hint { color: var(--text-muted); font-size: .875rem;
                   padding: .75rem 0; text-align: center; }