/* ═══════════════════════════════════════════════════════════════
   Beadlify — Apple HIG Refined
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bg:        #F5F5F7;
  --surface:   #FFFFFF;
  --panel-bg:  rgba(255,255,255,.78);
  --text:      #1d1d1f;
  --muted:     #86868b;
  --border:    #E5E5EA;
  --accent:    #007AFF;
  --accent-h:  #0066d6;
  --shadow:    0 3px 16px rgba(0,0,0,.055);
  --radius-sm: 10px;
  --radius:    14px;
  --font:      -apple-system, "SF Pro Display", "PingFang SC", BlinkMacSystemFont, sans-serif;
  --cell-outline: rgba(0,0,0,.12);
  --coord-bg:  #FAFAFA;
  --easing:    cubic-bezier(.25,.1,.25,1);
  --transition: .24s var(--easing);
  --glow-a:    rgba(0,122,255,.18);
  --glow-b:    rgba(255,149,0,.10);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%;scrollbar-gutter:stable}
body{
  font-family:var(--font);background:var(--bg);color:var(--text);
  min-height:100dvh;line-height:1.6;-webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;
  position:relative;isolation:isolate;overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:-18vmax;z-index:0;pointer-events:none;
  background:
    radial-gradient(circle at 88% 8%,var(--glow-a) 0 22%,transparent 42%),
    radial-gradient(circle at 16% 82%,var(--glow-b) 0 14%,transparent 34%);
  filter:blur(54px) saturate(112%);
  opacity:.82;
  transform:translateZ(0);
}
body::after{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.54),rgba(255,255,255,.18) 46%,rgba(255,255,255,.42));
}

.app{position:relative;z-index:1;max-width:1400px;margin:0 auto;padding:24px;display:grid;grid-template-columns:1fr;gap:16px;min-height:100dvh}
.sidebar-title{font-size:1.6rem;font-weight:600;text-align:center;margin:0 0 16px;color:var(--text);letter-spacing:-.02em}
.studio-toolbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin:0 0 16px}
.account-button{justify-self:end;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font:500 .72rem var(--font);padding:6px 8px;cursor:pointer;white-space:nowrap}
.account-button:hover{background:var(--bg)}
.studio-toolbar .sidebar-title{grid-column:2;margin:0;font-size:1.25rem;text-align:center}
.studio-back-button{grid-column:1;justify-self:start;position:relative;width:28px;height:28px;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--muted);transition:background var(--transition),border-color var(--transition),color var(--transition)}
.studio-back-button::after{content:"";position:absolute;left:11px;top:8px;width:8px;height:8px;border-bottom:1.5px solid currentColor;border-left:1.5px solid currentColor;transform:rotate(45deg)}
.studio-back-button:hover{background:rgba(60,60,67,.08);color:var(--text)}

/* ── Panel ────────────────────────────────────────────────── */
.panel{
  background:var(--panel-bg);border:1px solid rgba(255,255,255,.64);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);
  backdrop-filter:blur(18px) saturate(170%);
  -webkit-backdrop-filter:blur(18px) saturate(170%);
}
.panel-title{font-size:.75rem;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
#gridPanel>.panel-title{margin-bottom:4px}

/* ── Upload ───────────────────────────────────────────────── */
.upload-zone{
  border:2px dashed #E5E5EA;border-radius:var(--radius-sm);padding:32px 24px;
  text-align:center;cursor:pointer;transition:border-color var(--transition),background var(--transition);
  background:rgba(245,245,247,.5);display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:8px;
}
.upload-zone:hover,.upload-zone.drag-over{border-color:var(--accent);background:rgba(0,122,255,.04)}
.upload-icon{width:40px;height:40px;color:var(--accent)}
.upload-zone .primary-text{font-weight:500;font-size:.9rem;color:var(--text)}
.upload-zone .secondary-text{font-size:.75rem;color:var(--muted);word-break:keep-all}
.upload-zone input[type=file]{display:none}
.preview-thumb{width:140px;height:140px;border-radius:var(--radius-sm);object-fit:cover;box-shadow:0 2px 8px rgba(0,0,0,.06);margin:12px auto 0;display:block}
.preview-thumb.hidden{display:none}

/* ── Controls ─────────────────────────────────────────────── */
.controls-row{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end}
.control-group{display:flex;flex-direction:column;gap:6px}
.control-group label{font-size:.7rem;font-weight:500;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.control-group input[type=number]{padding:8px 12px;border:1px solid var(--border);border-radius:8px;font-size:.85rem;font-family:var(--font);background:var(--surface)}
.control-group input[type=number]{width:72px}

/* Native select keeps platform keyboard and accessibility behavior, with an iOS-style field shell. */
.brand-control{min-width:148px}
.brand-select-wrap{position:relative;isolation:isolate}
.brand-select-wrap::after{content:"";position:absolute;right:13px;top:50%;width:6px;height:6px;border-right:1.5px solid var(--muted);border-bottom:1.5px solid var(--muted);transform:translateY(-65%) rotate(45deg);pointer-events:none;z-index:1}
.brand-mark{position:absolute;left:12px;top:50%;width:15px;height:15px;transform:translateY(-50%);border-radius:50%;background:radial-gradient(circle at 36% 32%,#7BC8FF 0 17%,transparent 19%),radial-gradient(circle at 66% 44%,#007AFF 0 21%,transparent 23%),radial-gradient(circle at 46% 72%,#5AC8FA 0 20%,transparent 22%),#EAF4FF;box-shadow:inset 0 0 0 1px rgba(0,122,255,.15)}
#brandSelect{-webkit-appearance:none;appearance:none;width:100%;min-height:38px;padding:8px 34px 8px 36px;border:1px solid rgba(60,60,67,.16);border-radius:10px;background:rgba(255,255,255,.7);box-shadow:inset 0 1px rgba(255,255,255,.72),0 1px 2px rgba(0,0,0,.025);color:var(--text);font:500 .84rem/1.25 var(--font);cursor:pointer;outline:none;transition:border-color var(--transition),box-shadow var(--transition),background var(--transition),transform var(--transition)}
#brandSelect:hover{border-color:rgba(60,60,67,.28);background:var(--surface);box-shadow:inset 0 1px rgba(255,255,255,.8),0 2px 5px rgba(0,0,0,.045)}
#brandSelect:focus-visible{border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,122,255,.18),inset 0 1px rgba(255,255,255,.8);background:var(--surface)}
#brandSelect:active{transform:scale(.985)}

input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;background:#E5E5EA;border-radius:3px;outline:none;margin-top:6px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:#FFF;border:1px solid #D2D2D7;box-shadow:0 1px 4px rgba(0,0,0,.08),0 0 0 1px rgba(0,0,0,.02);cursor:pointer;transition:box-shadow var(--transition)}
input[type=range]::-webkit-slider-thumb:hover{box-shadow:0 2px 8px rgba(0,0,0,.12),0 0 0 1px rgba(0,0,0,.03)}
#gridSizeLabel{font-weight:500;color:var(--text);margin-left:6px;font-size:.85rem}
.step-btn{width:28px;height:28px;border:none;border-radius:6px;background:transparent;font-size:1.1rem;font-weight:400;cursor:pointer;font-family:var(--font);color:var(--muted);display:flex;align-items:center;justify-content:center;transition:all var(--transition)}
.step-btn:hover{background:var(--bg)}

.toggle-row{display:flex;flex-wrap:wrap;gap:16px;margin-top:12px}
.toggle-item{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.8rem;user-select:none;color:var(--text)}
.toggle-item input[type=checkbox]{-webkit-appearance:none;appearance:none;width:18px;height:18px;border:1.5px solid #D2D2D7;border-radius:4px;background:var(--surface);cursor:pointer;transition:all var(--transition);position:relative;flex-shrink:0}
.toggle-item input[type=checkbox]:checked{background:var(--accent);border-color:var(--accent)}
.toggle-item input[type=checkbox]:checked::after{content:'';position:absolute;left:5px;top:2px;width:5px;height:9px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
.toggle-item.is-disabled{opacity:.4;cursor:not-allowed}
.toggle-item.is-disabled input[type=checkbox]{cursor:not-allowed}
.brand-hint-tip{position:fixed;z-index:1000;transform:translate(-50%,-100%);background:rgba(0,0,0,.82);color:#fff;font:500 .72rem var(--font);padding:6px 10px;border-radius:8px;white-space:nowrap;pointer-events:none;opacity:0;transition:opacity var(--transition);box-shadow:0 4px 14px rgba(0,0,0,.2)}
.brand-hint-tip::after{content:'';position:absolute;left:50%;top:100%;transform:translateX(-50%);border:5px solid transparent;border-top-color:rgba(0,0,0,.82)}
.brand-hint-tip.is-visible{opacity:1}
.account-dialog{width:min(100% - 32px,380px);border:1px solid var(--border);border-radius:10px;background:var(--surface);box-shadow:0 18px 54px rgba(0,0,0,.22);color:var(--text);padding:0}.account-dialog::backdrop{background:rgba(0,0,0,.28);backdrop-filter:blur(3px)}.account-dialog-content{display:grid;gap:10px;padding:20px}.account-dialog-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.account-dialog h2{font-size:1.05rem;font-weight:600}.account-dialog label{font-size:.75rem;color:var(--muted);font-weight:500}.account-dialog input{width:100%;min-height:40px;border:1px solid var(--border);border-radius:8px;padding:0 10px;background:var(--bg);color:var(--text);font:.86rem var(--font);outline:none}.account-dialog input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,122,255,.14)}.verification-row{display:flex;align-items:center;justify-content:space-between}.verification-row button,.dialog-close{border:0;background:transparent;color:var(--accent);font:500 .75rem var(--font);cursor:pointer}.dialog-close{font-size:1.35rem;color:var(--muted);line-height:1}.account-message{min-height:18px;color:var(--muted);font-size:.74rem}.account-message.is-error{color:#d70015}

/* ── Buttons ──────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;border:none;border-radius:12px;font-size:.85rem;font-weight:500;font-family:var(--font);cursor:pointer;transition:all var(--transition);min-height:40px;min-width:40px}
.btn:disabled{opacity:.35;cursor:not-allowed}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover:not(:disabled){background:var(--accent-h)}
.btn-secondary{background:var(--bg);color:var(--text)}
.btn-secondary:hover:not(:disabled){background:#EBEBED}
.btn-block{width:100%}
.btn-export{padding:10px 20px;font-size:.85rem;min-height:40px;background:var(--accent);color:#fff;font-weight:500;border-radius:12px;cursor:pointer;font-family:var(--font);border:none;transition:all var(--transition)}
.btn-export:hover:not(:disabled){background:var(--accent-h)}
.btn-export:disabled{opacity:.35;cursor:not-allowed}
.btn-sm{padding:5px 12px;font-size:.72rem;min-height:28px;border-radius:8px}

/* ── Loading ──────────────────────────────────────────────── */
.loading-overlay{display:none;position:fixed;inset:0;z-index:100;background:rgba(245,245,247,.7);align-items:center;justify-content:center;flex-direction:column;gap:16px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.spinner{width:28px;height:28px;border:2.5px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Result ───────────────────────────────────────────────── */
.result-section{display:grid;gap:16px}
#gridPanel{display:flex;flex-direction:column;overflow:hidden}

/* ── Grid Area ────────────────────────────────────────────── */
.grid-area{flex:1 1 0;min-height:0;position:relative;overflow:hidden}
#previewCanvas{display:block;width:100%;height:100%;cursor:grab;touch-action:manipulation}
#previewCanvas:active{cursor:grabbing}
.zoom-controls{display:flex;gap:6px;align-items:center}
.zoom-btn{width:28px;height:26px;border:1px solid var(--border);border-radius:8px;background:var(--surface);font-size:.9rem;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-family:var(--font);color:var(--text);transition:background var(--transition)}
.zoom-btn:hover{background:var(--bg)}
#zoomSlider{width:80px;flex-shrink:0}


/* ── BOM ──────────────────────────────────────────────────── */
.bom-bar{display:flex;align-items:center;gap:12px;padding:12px 0 0;margin-top:12px;border-top:1px solid #F0F0F3}
.bom-list{display:flex;flex-wrap:wrap;gap:6px;flex:1;max-height:12vh;overflow-y:auto}
.bom-card{display:flex;align-items:center;gap:6px;padding:4px 10px;border-radius:8px;background:var(--bg);font-size:.75rem}
.bom-swatch{width:12px;height:12px;border-radius:50%;border:1px solid rgba(0,0,0,.1);flex-shrink:0}
.bom-count{font-weight:500;color:var(--accent);white-space:nowrap}

/* ── Dark ─────────────────────────────────────────────────── */
@media(prefers-color-scheme:dark){
  :root{--bg:#1C1C1E;--surface:#2C2C2E;--panel-bg:rgba(44,44,46,.76);--text:#F5F5F7;--muted:#98989D;--border:#3A3A3C;--shadow:0 3px 16px rgba(0,0,0,.25);--coord-bg:#2C2C2E;--cell-outline:rgba(255,255,255,.08);--glow-a:rgba(10,132,255,.20);--glow-b:rgba(255,159,10,.08)}
  body::after{background:linear-gradient(180deg,rgba(0,0,0,.2),rgba(0,0,0,.1) 48%,rgba(0,0,0,.22))}
  .panel{border-color:rgba(255,255,255,.08)}
  .studio-back-button:hover{background:rgba(235,235,245,.1)}
  #brandSelect{background:rgba(44,44,46,.72);border-color:rgba(235,235,245,.16);box-shadow:inset 0 1px rgba(255,255,255,.05)}
  #brandSelect:hover,#brandSelect:focus-visible{background:var(--surface)}
  .brand-mark{background:radial-gradient(circle at 36% 32%,#64D2FF 0 17%,transparent 19%),radial-gradient(circle at 66% 44%,#0A84FF 0 21%,transparent 23%),radial-gradient(circle at 46% 72%,#5AC8FA 0 20%,transparent 22%),#123C62;box-shadow:inset 0 0 0 1px rgba(100,210,255,.2)}
  .upload-zone{background:rgba(44,44,46,.5)}.upload-zone:hover,.upload-zone.drag-over{background:rgba(0,122,255,.08)}
  .bom-card{background:var(--surface)}
  .btn-secondary{background:var(--surface)}.btn-secondary:hover:not(:disabled){background:#3A3A3C}
  .zoom-btn{background:var(--surface);border-color:var(--border)}.zoom-btn:hover{background:#3A3A3C}
  .bead-grid.has-transparent{background-color:#1C1C1E;background-image:linear-gradient(45deg,#333 25%,transparent 25%),linear-gradient(-45deg,#333 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#333 75%),linear-gradient(-45deg,transparent 75%,#333 75%)}
  .grid-wrapper::-webkit-scrollbar-thumb{background:#555}.grid-wrapper::-webkit-scrollbar-thumb:hover{background:#666}
  .bom-bar,.coord-top-fixed,.coord-left-fixed,.coord-corner-fixed{border-color:#3A3A3C}
  .toggle-item input[type=checkbox]{border-color:#555}.spinner{border-color:var(--border)}
}

/* ── Desktop ──────────────────────────────────────────────── */
@media(min-width:900px){.app{grid-template-columns:280px 1fr;gap:24px;padding:32px 40px}.app>.sidebar{display:flex;flex-direction:column;height:100%}.app>.sidebar>.panel{flex:1;display:flex;flex-direction:column}.app>.sidebar>.panel>.upload-zone{flex:1;min-height:140px}.result-section{grid-column:2}}

/* ── Tablet ───────────────────────────────────────────────── */
@media(min-width:600px)and(max-width:899px){.app{grid-template-columns:240px 1fr;gap:16px;padding:20px}.app>.sidebar{display:flex;flex-direction:column;height:100%}.app>.sidebar>.panel{flex:1;display:flex;flex-direction:column}.app>.sidebar>.panel>.upload-zone{flex:1;min-height:120px}.result-section{grid-column:2}}

/* ── Mobile ───────────────────────────────────────────────── */
@media(max-width:599px){.app{padding:8px;gap:8px;min-height:100dvh;grid-template-rows:auto 1fr}.app>.sidebar>.panel{padding:12px}.upload-zone{padding:14px 10px;gap:4px}.upload-icon{width:28px;height:28px}.upload-zone .primary-text{font-size:.78rem}.preview-thumb{width:60px;height:60px}.controls-row{flex-direction:column;gap:8px;margin-top:8px!important;padding-top:8px!important}.control-group select,.control-group input{width:100%}.toggle-row{gap:8px;margin-top:6px}.toggle-item{font-size:.72rem}.result-section{grid-template-columns:1fr;grid-column:auto;flex:1}#gridPanel{min-height:60vh;flex:1}.grid-wrapper{min-height:50vh}.btn{min-height:36px;padding:7px 14px;font-size:.78rem}.sidebar-title{font-size:1.2rem;margin-bottom:8px}}