:root{--c-bg:#0c0e14;--c-surface:#13161e;--c-surface-2:#1a1d27;--c-surface-3:#21252f;--c-card:#171a23;--c-hover:#1f2330;--c-input:#10121a;--c-border:#262a36;--c-text:#e4e8f0;--c-text-2:#8991a4;--c-text-3:#5c6378;--c-accent:#818cf8;--c-accent-h:#a5b4fc;--c-accent-bg:rgba(129,140,248,.10);--c-accent-glow:rgba(129,140,248,.18);--c-ok:#34d399;--c-err:#f87171;--c-err-bg:rgba(248,113,113,.10);--c-pink:#f472b6;--shadow-sm:0 1px 3px rgba(0,0,0,.3);--shadow-md:0 4px 16px rgba(0,0,0,.35);--shadow-lg:0 12px 40px rgba(0,0,0,.45);--r:8px;--r-sm:5px;--r-lg:12px;--r-xl:16px;--sidebar-w:260px;--f-body:'DM Sans','Noto Sans SC',-apple-system,sans-serif;--f-mono:'IBM Plex Mono',monospace;--ease:cubic-bezier(.4,0,.2,1)}
[data-theme="light"]{--c-bg:#f4f5f8;--c-surface:#fff;--c-surface-2:#eef0f4;--c-surface-3:#e5e7ed;--c-card:#fff;--c-hover:#ebedf2;--c-input:#f4f5f8;--c-border:#d5d8e0;--c-text:#1a1d28;--c-text-2:#5e6476;--c-text-3:#9098ab;--c-accent:#6366f1;--c-accent-h:#818cf8;--c-accent-bg:rgba(99,102,241,.08);--c-accent-glow:rgba(99,102,241,.12);--c-ok:#059669;--c-err:#dc2626;--c-err-bg:rgba(220,38,38,.08);--c-pink:#ec4899;--shadow-sm:0 1px 3px rgba(0,0,0,.06);--shadow-md:0 4px 16px rgba(0,0,0,.08);--shadow-lg:0 12px 40px rgba(0,0,0,.10)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:14px}body{font-family:var(--f-body);background:var(--c-bg);color:var(--c-text);display:flex;min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased;line-height:1.55}img{display:block;max-width:100%}a{color:var(--c-accent);text-decoration:none}a:hover{color:var(--c-accent-h);text-decoration:underline}
::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--c-border);border-radius:3px}

/* ═══ Sidebar ═══ */
.sidebar{position:fixed;left:0;top:0;bottom:0;width:var(--sidebar-w);background:var(--c-surface);border-right:1px solid var(--c-border);display:flex;flex-direction:column;z-index:200;transition:transform .28s var(--ease)}
.sidebar-header{padding:14px 16px;border-bottom:1px solid var(--c-border)}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{flex-shrink:0}
.logo-text-wrap{display:flex;flex-direction:column;gap:0}
.logo-text{font-weight:700;font-size:1.05rem;letter-spacing:-.2px;background:linear-gradient(135deg,var(--c-pink),var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.logo-sub{font-size:.62rem;color:var(--c-text-3);letter-spacing:1px;text-transform:uppercase;margin-top:-1px}
.sidebar-search{padding:8px 12px;position:relative}.sidebar-search .si{position:absolute;left:22px;top:50%;transform:translateY(-50%);color:var(--c-text-3);pointer-events:none}.sidebar-search input{width:100%;padding:7px 10px 7px 30px;border-radius:var(--r);border:1px solid var(--c-border);background:var(--c-input);color:var(--c-text);font:inherit;font-size:.85rem;outline:none;transition:border-color .2s var(--ease)}.sidebar-search input:focus{border-color:var(--c-accent);box-shadow:0 0 0 3px var(--c-accent-bg)}.sidebar-search input::placeholder{color:var(--c-text-3)}
.sidebar-nav{flex:1;overflow-y:auto;padding:4px 0 8px}

/* ─── Collapsible Nav Groups ─── */
.nav-group{border-bottom:1px solid var(--c-border)}
.nav-group:last-child{border-bottom:none}
.nav-group-header{display:flex;align-items:center;gap:7px;padding:10px 14px;cursor:pointer;user-select:none;transition:background .15s var(--ease)}
.nav-group-header:hover{background:var(--c-hover)}
.ngh-icon{font-size:.85rem;width:18px;text-align:center}
.ngh-text{flex:1;font-size:.72rem;font-weight:600;color:var(--c-text-2);text-transform:uppercase;letter-spacing:1px}
.ngh-count{font-size:.65rem;color:var(--c-text-3);background:var(--c-surface-2);padding:1px 6px;border-radius:10px;font-family:var(--f-mono)}
.ngh-arrow{color:var(--c-text-3);transition:transform .25s var(--ease);flex-shrink:0}
.nav-group-body{overflow:hidden;transition:max-height .3s var(--ease),opacity .25s var(--ease)}
.nav-group-body.open{max-height:600px;opacity:1}
.nav-group-body.collapsed{max-height:0;opacity:0}
.nav-group-header.collapsed .ngh-arrow{transform:rotate(-90deg)}

.nav-item{display:flex;align-items:center;gap:8px;padding:6px 14px 6px 22px;color:var(--c-text-2);cursor:pointer;font-size:.85rem;font-weight:400;border-left:2.5px solid transparent;transition:all .15s var(--ease);text-decoration:none}
.nav-item:hover{background:var(--c-hover);color:var(--c-text);text-decoration:none}
.nav-item.active{background:var(--c-accent-bg);color:var(--c-accent);border-left-color:var(--c-accent);font-weight:500}
.nav-item.hidden{display:none}
.ni{font-size:.88rem;width:18px;text-align:center;flex-shrink:0;line-height:1}

/* ─── Sidebar Footer ─── */
.sidebar-footer{border-top:1px solid var(--c-border);padding:0}
.author-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:var(--c-surface-2)}
.author-badge{font-size:.7rem;color:var(--c-text-3);display:flex;align-items:center;gap:4px}
.author-badge strong{color:var(--c-pink);font-weight:700}
.ver-tag{font-size:.65rem;color:var(--c-text-3);font-family:var(--f-mono)}

/* ─── Page Footer + Hitokoto ─── */
.page-footer{margin-top:32px;padding-top:20px;border-top:1px solid var(--c-border)}
.hitokoto-bar{display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r-lg);cursor:pointer;transition:all .2s var(--ease);position:relative}
.hitokoto-bar:hover{border-color:var(--c-accent);background:var(--c-accent-bg)}
.hitokoto-icon{font-size:1.2rem;flex-shrink:0}
.hitokoto-text{flex:1;font-size:.88rem;color:var(--c-text);line-height:1.6;margin:0;font-style:italic;transition:opacity .3s}
.hitokoto-text.loading{opacity:.4}
.hitokoto-from{font-size:.74rem;color:var(--c-text-3);white-space:nowrap;flex-shrink:0}
.hitokoto-refresh{background:none;border:none;color:var(--c-text-3);cursor:pointer;padding:4px;border-radius:50%;transition:all .2s var(--ease);flex-shrink:0}
.hitokoto-refresh:hover{color:var(--c-accent);background:var(--c-accent-bg)}
.hitokoto-refresh svg{display:block}
.footer-credits{display:flex;align-items:center;justify-content:center;gap:6px;padding:16px 0 8px;font-size:.72rem;color:var(--c-text-3);flex-wrap:wrap}
.footer-credits strong{color:var(--c-pink);font-weight:700}
.footer-credits .sep{opacity:.4}

.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:190;backdrop-filter:blur(2px)}

/* ═══ Main ═══ */
.main{flex:1;margin-left:var(--sidebar-w);min-height:100vh;display:flex;flex-direction:column}
.topbar{padding:14px 24px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--c-border);background:var(--c-surface);position:sticky;top:0;z-index:80}
.menu-btn{display:none;background:none;border:none;color:var(--c-text-2);cursor:pointer;padding:2px}
.topbar-title{flex:1;font-size:1.2rem;font-weight:700;letter-spacing:-.2px}
.topbar-end{display:flex;gap:8px}
.theme-btn{width:34px;height:34px;border-radius:50%;border:1px solid var(--c-border);background:var(--c-surface-2);color:var(--c-text-2);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s var(--ease)}.theme-btn:hover{border-color:var(--c-accent);color:var(--c-accent)}
.content-wrap{flex:1;padding:20px 24px;max-width:1060px;width:100%}

/* ═══ Upload ═══ */
.upload-section{margin-bottom:20px}.drop-zone{border:2px dashed var(--c-border);border-radius:var(--r-xl);padding:36px 20px;text-align:center;background:var(--c-card);cursor:pointer;min-height:160px;display:flex;align-items:center;justify-content:center;transition:all .2s var(--ease);position:relative}.drop-zone:hover,.drop-zone.dragover{border-color:var(--c-accent);background:var(--c-accent-bg)}.drop-zone.dragover{transform:scale(1.005)}
.drop-icon{margin-bottom:12px;color:var(--c-text-3)}.drop-text{font-size:.95rem;color:var(--c-text-2);margin-bottom:6px}.drop-text a{font-weight:500}.drop-hint{font-size:.78rem;color:var(--c-text-3)}
.drop-preview{display:flex;align-items:center;gap:18px;width:100%;text-align:left;position:relative}.drop-preview img{max-width:160px;max-height:120px;border-radius:var(--r);object-fit:contain;background:repeating-conic-gradient(var(--c-surface-2) 0% 25%,transparent 0% 50%) 0 0/14px 14px;border:1px solid var(--c-border)}.preview-meta{flex:1;font-size:.85rem;color:var(--c-text-2);line-height:1.75}.preview-meta strong{color:var(--c-text);font-weight:600}.preview-clear{position:absolute;top:-6px;right:-6px;width:26px;height:26px;border-radius:50%;border:1px solid var(--c-border);background:var(--c-surface);color:var(--c-text-3);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s var(--ease)}.preview-clear:hover{border-color:var(--c-err);color:var(--c-err);background:var(--c-err-bg)}

/* ═══ Settings ═══ */
.settings-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r-xl);padding:22px 24px;margin-bottom:20px}
.stitle{font-size:1rem;font-weight:600;margin-bottom:6px;display:flex;align-items:center;gap:8px}.sdesc{color:var(--c-text-2);font-size:.85rem;margin-bottom:16px;line-height:1.65;border-left:3px solid var(--c-accent-bg);padding-left:12px}.fg{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px}.fg-full{grid-column:1/-1}.fi{display:flex;flex-direction:column;gap:5px}.fl{font-size:.82rem;font-weight:500;color:var(--c-text-2)}.fhint{font-size:.74rem;color:var(--c-text-3);margin-top:2px;line-height:1.4}
.ft,.fs,.fta{padding:8px 11px;border:1px solid var(--c-border);border-radius:var(--r-sm);background:var(--c-input);color:var(--c-text);font:inherit;font-size:.88rem;outline:none;width:100%;transition:border-color .2s var(--ease)}.ft:focus,.fs:focus,.fta:focus{border-color:var(--c-accent);box-shadow:0 0 0 3px var(--c-accent-bg)}.fs{cursor:pointer;-webkit-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%238991a4' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:28px}.fta{resize:vertical;min-height:64px}.fr{width:100%;accent-color:var(--c-accent);cursor:pointer;height:6px}.rv{font-family:var(--f-mono);font-size:.82rem;color:var(--c-accent);font-weight:600}.fc-wrap{display:flex;align-items:center;gap:9px}.fc{width:34px;height:34px;border-radius:var(--r-sm);border:1px solid var(--c-border);cursor:pointer;padding:2px;background:var(--c-input)}.fchk{display:flex;align-items:center;gap:7px;cursor:pointer;font-size:.88rem;color:var(--c-text-2)}.fchk input[type="checkbox"]{accent-color:var(--c-accent);width:15px;height:15px}
.btn-row{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap}.btn{padding:9px 20px;border-radius:var(--r);border:1px solid var(--c-border);font:inherit;font-size:.88rem;font-weight:500;cursor:pointer;display:inline-flex;align-items:center;gap:7px;transition:all .18s var(--ease)}.btn-p{background:var(--c-accent);color:#fff;border-color:var(--c-accent)}.btn-p:hover{background:var(--c-accent-h);transform:translateY(-1px);box-shadow:0 4px 14px var(--c-accent-glow)}.btn-s{background:var(--c-surface-2);color:var(--c-text)}.btn-s:hover{background:var(--c-hover);border-color:var(--c-text-3)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important}

/* Filter/Preset grids */
.filt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:8px;margin-bottom:14px}.filt-card{padding:12px 8px;border:1.5px solid var(--c-border);border-radius:var(--r);text-align:center;cursor:pointer;font-size:.78rem;font-weight:500;background:var(--c-surface-2);transition:all .15s var(--ease)}.filt-card:hover{border-color:var(--c-accent);background:var(--c-accent-bg)}.filt-card.sel{border-color:var(--c-accent);background:var(--c-accent-bg);color:var(--c-accent)}.fe{font-size:1.35rem;display:block;margin-bottom:4px}
.preset-row{display:flex;flex-wrap:wrap;gap:6px}.preset{padding:5px 12px;border:1px solid var(--c-border);border-radius:18px;background:var(--c-surface-2);color:var(--c-text-2);font-size:.78rem;cursor:pointer;transition:all .15s var(--ease)}.preset:hover,.preset.sel{border-color:var(--c-accent);color:var(--c-accent);background:var(--c-accent-bg)}

/* ═══ Result ═══ */
.result-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--r-xl);overflow:hidden;animation:slideUp .25s var(--ease)}@keyframes slideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.result-bar{padding:14px 22px;display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid var(--c-border);background:var(--c-surface-2)}.result-bar h3{font-size:.95rem;font-weight:600}.result-time{font-size:.76rem;color:var(--c-text-3);font-family:var(--f-mono);flex:1;text-align:right}.btn-icon{background:none;border:none;color:var(--c-text-3);cursor:pointer;padding:4px;border-radius:var(--r-sm);transition:all .15s var(--ease)}.btn-icon:hover{background:var(--c-hover);color:var(--c-text)}.result-body{padding:22px}
.res-img{text-align:center;margin-bottom:14px}.res-img img{max-width:100%;max-height:480px;border-radius:var(--r);object-fit:contain;background:repeating-conic-gradient(var(--c-surface-2) 0% 25%,transparent 0% 50%) 0 0/14px 14px}.res-dl{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* Info/Palette/Histogram/Base64/Hash... */
.info-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-bottom:18px}.info-c{background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--r);padding:12px 14px}.info-c-l{font-size:.72rem;color:var(--c-text-3);text-transform:uppercase;letter-spacing:.5px;margin-bottom:3px}.info-c-v{font-size:1.05rem;font-weight:600;font-family:var(--f-mono)}.info-c-v.sm{font-size:.88rem}
.exif-wrap{max-height:280px;overflow-y:auto;border:1px solid var(--c-border);border-radius:var(--r)}.exif-t{width:100%;border-collapse:collapse;font-size:.85rem}.exif-t th,.exif-t td{padding:7px 12px;text-align:left;border-bottom:1px solid var(--c-border)}.exif-t th{font-weight:600;color:var(--c-text-2);font-size:.78rem;text-transform:uppercase;background:var(--c-surface-3);position:sticky;top:0}.exif-t td:first-child{font-weight:500;color:var(--c-accent);font-family:var(--f-mono);font-size:.78rem}
.pal-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px}.pal-card{border-radius:var(--r);overflow:hidden;border:1px solid var(--c-border);background:var(--c-card);cursor:pointer;transition:transform .15s var(--ease)}.pal-card:hover{transform:translateY(-2px)}.pal-sw{height:70px;width:100%}.pal-info{padding:7px 9px;font-family:var(--f-mono);font-size:.74rem;color:var(--c-text-2)}.pal-info strong{display:block;color:var(--c-text);font-size:.84rem;margin-bottom:1px}
.hist-box{background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--r);padding:14px}.hist-box h4{font-size:.85rem;color:var(--c-text-2);margin-bottom:8px;font-weight:500}.hist-canvas{width:100%;height:130px}
.b64-out{background:var(--c-input);border:1px solid var(--c-border);border-radius:var(--r);padding:12px;font-family:var(--f-mono);font-size:.76rem;color:var(--c-text-2);max-height:180px;overflow-y:auto;word-break:break-all;line-height:1.5;user-select:all}
.comp-stats{display:flex;gap:18px;align-items:center;justify-content:center;margin:14px 0;padding:14px;background:var(--c-surface-2);border-radius:var(--r);border:1px solid var(--c-border)}.cs-item{text-align:center}.cs-label{font-size:.72rem;color:var(--c-text-3);text-transform:uppercase}.cs-val{font-size:1.2rem;font-weight:700;font-family:var(--f-mono)}.cs-val.pos{color:var(--c-ok)}.cs-val.neg{color:var(--c-err)}.cs-arrow{font-size:1.3rem;color:var(--c-text-3)}
.flist{list-style:none;margin-bottom:14px}.flist-i{display:flex;align-items:center;gap:9px;padding:7px 11px;border:1px solid var(--c-border);border-radius:var(--r-sm);margin-bottom:5px;background:var(--c-surface-2);font-size:.85rem}.flist-i .fn{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.flist-i .fsz{color:var(--c-text-3);font-family:var(--f-mono);font-size:.76rem}.flist-i .frm{background:none;border:none;color:var(--c-text-3);cursor:pointer;font-size:15px;padding:2px}.flist-i .frm:hover{color:var(--c-err)}
.hash-grid{display:grid;gap:8px;margin-bottom:14px}.hash-row{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--c-surface-2);border:1px solid var(--c-border);border-radius:var(--r);cursor:pointer;transition:background .15s}.hash-row:hover{background:var(--c-hover)}.hash-row .hl{font-size:.76rem;font-weight:600;color:var(--c-text-3);text-transform:uppercase;width:56px;flex-shrink:0}.hash-row .hv{flex:1;font-family:var(--f-mono);font-size:.78rem;color:var(--c-text);word-break:break-all}.hash-row .hc{font-size:.72rem;color:var(--c-accent);opacity:0;transition:opacity .15s}.hash-row:hover .hc{opacity:1}

/* Loading / Toast */
.loading-mask{position:fixed;inset:0;background:rgba(0,0,0,.55);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000}.loading-box{text-align:center;color:var(--c-text)}.ld-spinner{width:38px;height:38px;border:3px solid var(--c-border);border-top-color:var(--c-accent);border-radius:50%;animation:spin .7s linear infinite;margin:0 auto 12px}@keyframes spin{to{transform:rotate(360deg)}}.loading-box p{font-size:.9rem;color:var(--c-text-2)}
.toast-rack{position:fixed;top:18px;right:18px;z-index:2000;display:flex;flex-direction:column;gap:7px}.toast{padding:10px 16px;border-radius:var(--r);font-size:.85rem;font-weight:500;animation:toastIn .25s var(--ease);max-width:360px;box-shadow:var(--shadow-lg);display:flex;align-items:center;gap:7px;transition:opacity .2s,transform .2s}.toast.ok{background:var(--c-ok);color:#fff}.toast.err{background:var(--c-err);color:#fff}.toast.info{background:var(--c-accent);color:#fff}@keyframes toastIn{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:translateX(0)}}

/* Responsive */
@media(max-width:768px){.sidebar{transform:translateX(-100%)}.sidebar.open{transform:translateX(0);box-shadow:var(--shadow-lg)}.sidebar.open~.sidebar-overlay{display:block}.menu-btn{display:block}.main{margin-left:0}.content-wrap{padding:14px}.fg{grid-template-columns:1fr}.filt-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}.topbar{padding:10px 14px}.info-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.drop-zone{padding:20px 14px}.info-grid{grid-template-columns:1fr}.btn-row{flex-direction:column}.btn{width:100%;justify-content:center}}