/* ═══════════════════════════════════════════════════════════════════
   Image to Base64 — the tool's own parts.
   Tokens, sections, buttons and cards come from signal.css.
   ═══════════════════════════════════════════════════════════════════ */
.b64-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(1.5rem, 3vw, 2.5rem); align-items: start; }

.b64-drop { display: grid; place-items: center; gap: .8rem; padding: clamp(2rem, 5vw, 3.5rem) 1.5rem; border: 1.5px dashed var(--line-2); border-radius: var(--r); background: rgba(255, 255, 255, .02); text-align: center; cursor: pointer; transition: border-color .2s, background .2s, transform .2s; }
.b64-drop:hover, .b64-drop:focus-visible { border-color: rgba(52, 211, 153, .55); background: rgba(52, 211, 153, .05); }
.b64-drop.is-over { border-color: var(--green); background: rgba(52, 211, 153, .1); transform: scale(1.01); }
.b64-drop-icon { font-size: 1.8rem; color: var(--green); }
.b64-drop strong { font-family: var(--display); font-size: 1.15rem; font-weight: 700; color: var(--ink); }
.b64-drop span { color: var(--dim); font: 600 .62rem/1.6 var(--mono); letter-spacing: .16em; text-transform: uppercase; }
.b64-drop input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }

.b64-status { margin-top: 1rem; padding: .9rem 1.1rem; border-radius: .9rem; border: 1px solid var(--line-2); background: rgba(255, 255, 255, .03); color: var(--muted); font-size: .9rem; line-height: 1.55; }
.b64-status[data-tone="bad"] { border-color: rgba(251, 113, 133, .45); background: rgba(251, 113, 133, .08); color: #ffd7dd; }
.b64-status[hidden] { display: none; }

.b64-panel { border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); overflow: hidden; }
.b64-panel-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .85rem 1.1rem; border-bottom: 1px solid var(--line); color: var(--dim); font: 600 .6rem/1 var(--mono); letter-spacing: .2em; text-transform: uppercase; }
.b64-panel-body { padding: 1.1rem; }

.b64-preview { display: grid; place-items: center; min-height: 140px; padding: 1.2rem; border-radius: .9rem; background-color: #0b1220;
    /* A checkerboard, so transparency is visible rather than guessed at. */
    background-image: linear-gradient(45deg, rgba(255,255,255,.04) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.04) 75%),
                      linear-gradient(45deg, rgba(255,255,255,.04) 25%, transparent 25%, transparent 75%, rgba(255,255,255,.04) 75%);
    background-size: 18px 18px; background-position: 0 0, 9px 9px; }
.b64-preview-img { max-width: 100%; max-height: 220px; height: auto; display: block; }

.b64-statgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr)); gap: .8rem; margin: 1rem 0 0; }
.b64-stat { padding: .7rem .8rem; border: 1px solid var(--line); border-radius: .7rem; background: rgba(255, 255, 255, .02); }
.b64-stat dt { color: var(--dim); font: 600 .55rem/1 var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.b64-stat dd { margin: .4rem 0 0; color: var(--ink); font-size: .92rem; font-weight: 600; }

.b64-advice { margin-top: 1rem; padding: 1.1rem 1.2rem; border-radius: var(--r); border: 1px solid var(--line-2); background: rgba(255, 255, 255, .02); }
.b64-advice[data-verdict="inline"] { border-color: rgba(52, 211, 153, .45); background: rgba(52, 211, 153, .07); }
.b64-advice[data-verdict="borderline"] { border-color: rgba(252, 211, 77, .45); background: rgba(252, 211, 77, .06); }
.b64-advice[data-verdict="link"] { border-color: rgba(251, 113, 133, .4); background: rgba(251, 113, 133, .06); }
.b64-verdict { font-family: var(--display); font-size: 1.25rem; font-weight: 800; letter-spacing: -.02em; color: var(--ink); }
.b64-advice[data-verdict="inline"] .b64-verdict { color: var(--green-2); }
.b64-advice[data-verdict="borderline"] .b64-verdict { color: #fcd34d; }
.b64-advice[data-verdict="link"] .b64-verdict { color: #fb7185; }
.b64-reasons { list-style: none; margin: .7rem 0 0; padding: 0; display: grid; gap: .5rem; }
.b64-reasons li { position: relative; padding-left: 1rem; color: var(--muted); font-size: .9rem; line-height: 1.55; }
.b64-reasons li::before { content: ''; position: absolute; left: 0; top: .55rem; width: .3rem; height: .3rem; border-radius: 50%; background: currentColor; opacity: .6; }
.b64-note { margin-top: .8rem; color: var(--dim); font-size: .82rem; line-height: 1.55; }
.b64-bad { color: #ffd7dd; font-size: .9rem; line-height: 1.55; }
.b64-hazards { margin-top: .9rem; padding: .9rem 1rem; border-radius: .8rem; border: 1px solid rgba(251, 113, 133, .45); background: rgba(251, 113, 133, .08); color: #ffd7dd; font-size: .85rem; line-height: 1.55; }
.b64-hazards strong { display: block; margin-bottom: .4rem; color: #fff; }
.b64-hazards ul { margin: .3rem 0; padding-left: 1.1rem; }

.b64-tabs { display: flex; flex-wrap: wrap; gap: .35rem; padding: .8rem 1.1rem 0; }
.b64-tab { padding: .45rem .8rem; border-radius: 999px; border: 1px solid var(--line); background: transparent; color: var(--muted); font: 600 .68rem/1 var(--mono); letter-spacing: .08em; cursor: pointer; transition: color .2s, border-color .2s, background .2s; }
.b64-tab:hover { color: var(--ink); }
.b64-tab.is-active { color: var(--green); border-color: rgba(52, 211, 153, .5); background: rgba(52, 211, 153, .1); }
.b64-code { margin: .9rem 1.1rem 1.1rem; padding: 1rem; max-height: 16rem; overflow: auto; border-radius: .8rem; border: 1px solid var(--line); background: #060b12; color: var(--ink); font: 400 .8rem/1.6 var(--mono); white-space: pre-wrap; word-break: break-all; }
.b64-actions { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0 1.1rem 1.1rem; }
.b64-actions .sg-btn { padding: .6rem 1.1rem; font-size: .82rem; }

.b64-toggle { display: inline-flex; align-items: center; gap: .5rem; color: var(--muted); font-size: .84rem; cursor: pointer; }
.b64-toggle input { accent-color: #34d399; width: 1rem; height: 1rem; }
.b64-toggle[hidden] { display: none; }

.b64-decode textarea { width: 100%; min-height: 8rem; padding: .9rem 1rem; border-radius: .9rem; border: 1px solid var(--line-2); background: rgba(255, 255, 255, .03); color: var(--ink); font: 400 .8rem/1.6 var(--mono); resize: vertical; outline: none; }
.b64-decode textarea:focus { border-color: var(--green); box-shadow: 0 0 0 4px rgba(52, 211, 153, .15); }
.b64-decode-out { display: grid; gap: .9rem; justify-items: start; margin-top: 1rem; }
.b64-decode-out:empty { display: none; }

@media (max-width: 900px) {
    .b64-grid { grid-template-columns: minmax(0, 1fr); }
}

/* ── Optimise panel ── */
.b64-optimise { margin-top: 1.5rem; padding: 1.1rem 1.2rem; border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); }
.b64-optimise[hidden] { display: none; }
.b64-field { display: grid; gap: .4rem; margin-top: 1rem; }
.b64-field label { display: flex; justify-content: space-between; gap: 1rem; color: var(--dim); font: 600 .58rem/1 var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.b64-field label span { color: var(--green); }
.b64-field input[type="range"] { width: 100%; accent-color: #34d399; }
.b64-field input[type="range"]:disabled { opacity: .35; }
.b64-field select { padding: .6rem .8rem; border-radius: .7rem; border: 1px solid var(--line-2); background: rgba(255,255,255,.03); color: var(--ink); font: 400 .88rem/1 var(--body); outline: none; }
.b64-field select:disabled { opacity: .35; }
.b64-field select:focus { border-color: var(--green); }
.b64-bakeoff { display: grid; gap: .35rem; margin-top: 1rem; }
.b64-bakeoff:empty { display: none; }
.b64-cand { display: flex; align-items: center; justify-content: space-between; gap: .8rem; padding: .5rem .7rem; border: 1px solid var(--line); border-radius: .6rem; color: var(--muted); font: 500 .78rem/1 var(--body); }
.b64-cand.is-winner { border-color: rgba(52,211,153,.5); background: rgba(52,211,153,.08); color: var(--ink); }
.b64-cand b { font: 600 .68rem/1 var(--mono); letter-spacing: .1em; }
.b64-cand.is-winner b { color: var(--green); }
.b64-saving { margin-top: .8rem; padding: .7rem .9rem; border-radius: .7rem; border: 1px solid rgba(52,211,153,.4); background: rgba(52,211,153,.08); color: var(--ink); font-size: .85rem; line-height: 1.5; }
.b64-warn { margin-top: .6rem; padding: .7rem .85rem; border-radius: .7rem; border: 1px solid rgba(252, 211, 77, .45); background: rgba(252, 211, 77, .07); color: #fde68a; font-size: .8rem; line-height: 1.5; }
.b64-warn[hidden] { display: none; }