/* ============================================================
   css/app.css  —  Login + App Shell + All Tab Styles
   ============================================================ */

/* ══ LOGIN SCREEN ══════════════════════════════════════════ */
#screen-login{align-items:center;justify-content:center;background:linear-gradient(140deg,#0A2D6E 0%,#1565C0 55%,#1E88E5 100%);position:relative;overflow:hidden;padding:20px}
#screen-login::before,#screen-login::after{content:'';position:absolute;border-radius:50%;pointer-events:none}
#screen-login::before{width:600px;height:600px;background:radial-gradient(circle,rgba(255,255,255,.05),transparent 70%);top:-180px;right:-180px}
#screen-login::after{width:450px;height:450px;background:radial-gradient(circle,rgba(0,188,212,.09),transparent 70%);bottom:-130px;left:-90px}

.login-wrap{position:relative;z-index:1;width:100%;max-width:420px}
.login-card{background:rgba(255,255,255,.97);border-radius:22px;padding:40px 36px;box-shadow:0 22px 70px rgba(0,0,0,.26)}
.login-brand{text-align:center;margin-bottom:32px}
.login-logo{width:68px;height:68px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:18px;display:inline-flex;align-items:center;justify-content:center;margin:0 auto 13px;box-shadow:0 7px 24px rgba(21,101,192,.32);font-size:30px;color:#fff}
.login-brand h1{font-size:20px;font-weight:700;margin-bottom:4px}
.login-brand p{font-size:13px;color:var(--text2)}
.version-badge{display:inline-block;background:var(--primary-xl);color:var(--primary);padding:2px 10px;border-radius:20px;font-size:11px;font-weight:700;margin-top:5px}
.demo-hint{background:linear-gradient(135deg,rgba(0,188,212,.06),rgba(21,101,192,.06));border:1px solid rgba(0,188,212,.18);border-radius:var(--r-sm);padding:11px 15px;font-size:12px;color:#005F64;text-align:center;line-height:1.6;margin-top:12px}
.adv-toggle{display:flex;align-items:center;justify-content:center;gap:5px;font-size:12px;color:var(--text3);cursor:pointer;user-select:none;margin-top:12px;padding:6px;border-radius:6px;transition:var(--tr)}
.adv-toggle:hover{color:var(--primary);background:var(--primary-xl)}
.adv-arrow{font-size:10px;transition:transform .2s}
.adv-toggle.open .adv-arrow{transform:rotate(180deg)}
.adv-section{max-height:0;overflow:hidden;transition:max-height .3s ease}
.adv-section.open{max-height:200px}
.adv-inner{padding-top:14px}
.login-error{display:none;background:var(--danger-bg);border:1px solid rgba(198,40,40,.18);border-radius:var(--r-sm);padding:10px 13px;font-size:12px;color:var(--danger);text-align:center;margin-top:12px}
.login-error.show{display:block}
.login-footer{text-align:center;margin-top:16px;font-size:11px;color:rgba(255,255,255,.45)}
@media(max-width:460px){.login-card{padding:28px 22px}.login-brand h1{font-size:17px}}

/* ══ APP SHELL ══════════════════════════════════════════════ */
#screen-app{flex-direction:column;min-height:100vh}

/* Topbar */
.topbar{background:var(--surface);border-bottom:1px solid var(--border);height:58px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:200;box-shadow:0 1px 10px rgba(21,101,192,.07);flex-shrink:0}
.topbar-left,.topbar-right{display:flex;align-items:center;gap:10px}
.tb-logo{width:34px;height:34px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:17px;color:#fff;flex-shrink:0}
.tb-title{font-size:14px;font-weight:700;color:var(--text);white-space:nowrap}
.tb-school{background:var(--bg);border:1px solid var(--border);color:var(--primary);padding:3px 11px;border-radius:20px;font-size:11px;font-weight:700;white-space:nowrap}
.mode-badge{padding:3px 11px;border-radius:20px;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em}
.mode-badge.live{background:rgba(46,125,50,.11);color:var(--success);border:1px solid rgba(46,125,50,.22);animation:pulse-live 2.5s ease infinite}
@keyframes pulse-live{0%,100%{box-shadow:0 0 0 0 rgba(46,125,50,.3)}50%{box-shadow:0 0 0 4px rgba(46,125,50,0)}}

/* Nav tabs */
.nav-bar{background:var(--surface);border-bottom:1px solid var(--border);padding:0 18px;display:flex;gap:2px;overflow-x:auto;flex-shrink:0;scrollbar-width:none}
.nav-bar::-webkit-scrollbar{display:none}
.nav-tab{display:flex;align-items:center;gap:6px;padding:13px 14px;font-size:13px;font-weight:600;color:var(--text2);cursor:pointer;border-bottom:3px solid transparent;transition:var(--tr);white-space:nowrap;user-select:none}
.nav-tab:hover{color:var(--primary)}
.nav-tab.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-badge{background:var(--primary);color:#fff;border-radius:10px;padding:1px 7px;font-size:10px;font-weight:700;min-width:18px;text-align:center}
.tab-badge.green{background:var(--success)}.tab-badge.orange{background:var(--warning)}

/* Panels */
.tab-panel{display:none}.tab-panel.active{display:block}
.page{padding:24px;max-width:1280px;margin:0 auto}

/* ══ DASHBOARD ══════════════════════════════════════════════ */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:15px;margin-bottom:24px}
.stat-card{background:var(--surface);border-radius:var(--r);border:1px solid var(--border);padding:20px;position:relative;overflow:hidden;box-shadow:var(--shadow);transition:var(--tr)}
.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.stat-card::after{content:'';position:absolute;top:0;left:0;right:0;height:4px;border-radius:var(--r) var(--r) 0 0}
.c-blue::after{background:linear-gradient(90deg,var(--primary),var(--accent))}.c-green::after{background:linear-gradient(90deg,var(--success),#81C784)}.c-orange::after{background:linear-gradient(90deg,var(--warning),#FFCA28)}.c-teal::after{background:linear-gradient(90deg,#00897B,#4DB6AC)}
.stat-icon{width:40px;height:40px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:19px;margin-bottom:12px}
.c-blue .stat-icon{background:rgba(21,101,192,.09)}.c-green .stat-icon{background:rgba(46,125,50,.09)}.c-orange .stat-icon{background:rgba(245,127,23,.09)}.c-teal .stat-icon{background:rgba(0,137,123,.09)}
.stat-value{font-size:28px;font-weight:700;line-height:1}.stat-label{font-size:11px;font-weight:600;color:var(--text2);margin-top:5px;text-transform:uppercase;letter-spacing:.04em}
.dash-row{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-bottom:15px}
@media(max-width:860px){.dash-row{grid-template-columns:1fr}}

/* ══ STUDENTS GRID ══════════════════════════════════════════ */
.students-toolbar{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:18px;align-items:center}
.search-wrap{flex:1;min-width:180px;position:relative}
.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);font-size:14px;opacity:.38;pointer-events:none}
.search-input{width:100%;padding:10px 14px 10px 38px;border:2px solid var(--border);border-radius:var(--r-sm);font-size:13px;color:var(--text);background:var(--surface);outline:none;transition:var(--tr)}
.search-input:focus{border-color:var(--primary)}
.filter-select{padding:10px 30px 10px 13px;border:2px solid var(--border);border-radius:var(--r-sm);font-size:13px;color:var(--text);background:var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath fill='%238A9BC4' d='M1 1l5 5 5-5'/%3E%3C/svg%3E") no-repeat right 10px center;appearance:none;outline:none;cursor:pointer;min-width:120px}
.filter-select:focus{border-color:var(--primary)}

.student-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:13px}
.student-card{background:var(--surface);border-radius:var(--r);border:2px solid var(--border);overflow:hidden;cursor:pointer;transition:var(--tr)}
.student-card:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-2px)}
.student-card.captured{border-color:rgba(46,125,50,.32)}
.student-card.selected{border-color:var(--primary);box-shadow:0 0 0 3px rgba(21,101,192,.13)}
.sc-photo{aspect-ratio:3/4;background:linear-gradient(145deg,var(--bg),#E0E8FF);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;font-size:40px}
.sc-photo img{width:100%;height:100%;object-fit:cover}
.sc-status{position:absolute;top:7px;right:7px;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700}
.sc-status.done{background:var(--success);color:#fff}.sc-status.pending{background:var(--warning);color:#fff}
.sc-info{padding:9px 11px}
.sc-name{font-weight:700;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sc-id{font-size:10px;color:var(--text2);font-family:'DM Mono',monospace;margin-top:1px}
.sc-class{font-size:10px;color:var(--primary);font-weight:600;margin-top:2px}

/* ══ UPLOAD ══════════════════════════════════════════════════ */
.upload-zone{border:3px dashed var(--border);border-radius:var(--r);padding:48px 28px;text-align:center;background:var(--surface);cursor:pointer;transition:var(--tr);position:relative}
.upload-zone:hover,.upload-zone.drag-active{border-color:var(--primary);background:var(--primary-xl)}
.upload-zone input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.upload-zone .drop-icon{font-size:48px;margin-bottom:12px}
.upload-zone h3{font-size:17px;font-weight:700;margin-bottom:7px}
.upload-zone p{font-size:13px;color:var(--text2);margin-bottom:18px}

/* ══ CAMERA ══════════════════════════════════════════════════ */
.camera-layout{display:grid;grid-template-columns:1fr 280px;gap:18px;padding:18px 22px;max-width:1060px;margin:0 auto;align-items:start}
@media(max-width:860px){.camera-layout{grid-template-columns:1fr}.camera-panel{order:2}.camera-main{order:1}}

.cam-viewport{background:#111;border-radius:var(--r);overflow:hidden;aspect-ratio:3/4;max-height:520px;position:relative}
#webcam{width:100%;height:100%;object-fit:cover;display:block}
.cam-overlay{position:absolute;inset:0;pointer-events:none}

/* Face oval guide */
.face-oval{position:absolute;top:7%;left:50%;transform:translateX(-50%);width:52%;aspect-ratio:1;border:2.5px solid rgba(0,230,255,.85);border-radius:50%;box-shadow:0 0 0 9999px rgba(0,0,0,.20)}
.face-oval::after{content:'Center face here';position:absolute;bottom:-26px;left:50%;transform:translateX(-50%);font-size:10px;color:rgba(0,230,255,.9);font-family:'DM Sans',sans-serif;font-weight:700;text-transform:uppercase;letter-spacing:.06em;white-space:nowrap}

/* Corner brackets */
.cam-corners>span{position:absolute;width:20px;height:20px;border-color:rgba(0,230,255,.85);border-style:solid}
.cam-corners>span:nth-child(1){top:9px;left:9px;border-width:2.5px 0 0 2.5px;border-radius:3px 0 0 0}
.cam-corners>span:nth-child(2){top:9px;right:9px;border-width:2.5px 2.5px 0 0;border-radius:0 3px 0 0}
.cam-corners>span:nth-child(3){bottom:9px;left:9px;border-width:0 0 2.5px 2.5px;border-radius:0 0 0 3px}
.cam-corners>span:nth-child(4){bottom:9px;right:9px;border-width:0 2.5px 2.5px 0;border-radius:0 0 3px 0}

/* Preview overlay */
.capture-preview{position:absolute;inset:0;display:none}
.capture-preview.show{display:block}
.capture-preview img{width:100%;height:100%;object-fit:cover}
.preview-actions{position:absolute;bottom:0;left:0;right:0;padding:13px;background:linear-gradient(transparent,rgba(0,0,0,.65));display:flex;gap:8px}

/* No camera */
.cam-no-access{position:absolute;inset:0;display:none;flex-direction:column;align-items:center;justify-content:center;color:rgba(255,255,255,.75);gap:12px;text-align:center;padding:22px}
.cam-no-access.show{display:flex}
.cam-no-access .cam-big-icon{font-size:52px;opacity:.4}

/* Shutter */
.shutter-bar{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:15px}
.shutter-btn{width:66px;height:66px;border-radius:50%;background:var(--surface);border:4px solid var(--primary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--tr);box-shadow:0 3px 16px rgba(21,101,192,.24);flex-shrink:0}
.shutter-btn:hover{transform:scale(1.06);box-shadow:0 5px 26px rgba(21,101,192,.36)}
.shutter-btn:active{transform:scale(.93)}
.shutter-btn::after{content:'';width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent))}

/* Queue */
.csb-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:14px;margin-bottom:13px}
.csb-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text3);margin-bottom:8px}
.csb-name{font-size:16px;font-weight:700;color:var(--text);margin-bottom:3px}
.csb-meta{font-size:11px;color:var(--text2)}

.queue-card{overflow:hidden}
.queue-scroll{max-height:380px;overflow-y:auto}

/* ── Queue class header ── */
.queue-class-header{padding:6px 14px;background:var(--primary);color:#fff;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;position:sticky;top:0;z-index:1}

.queue-item{display:flex;align-items:center;gap:9px;padding:9px 14px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .13s}
.queue-item:last-child{border-bottom:none}
.queue-item:hover{background:var(--bg)}
.queue-item.q-active{background:var(--primary-xl);border-left:3px solid var(--primary);padding-left:11px}
.queue-item.q-done{opacity:.54}
.q-avatar{width:32px;height:32px;border-radius:7px;background:var(--bg);flex-shrink:0;overflow:hidden;display:flex;align-items:center;justify-content:center;font-size:15px}
.q-avatar img{width:100%;height:100%;object-fit:cover}
.q-info{flex:1;min-width:0}
.q-name{font-size:12px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.q-sub{font-size:10px;color:var(--text2);margin-top:1px}
.q-status{font-size:14px}

/* ══ EXPORT ══════════════════════════════════════════════════ */
.export-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:740px){.export-grid{grid-template-columns:1fr}}
.photo-thumb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(64px,1fr));gap:7px;margin-bottom:15px}
.photo-thumb{aspect-ratio:3/4;border-radius:7px;overflow:hidden;background:var(--bg);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:20px;position:relative}
.photo-thumb img{width:100%;height:100%;object-fit:cover}
.thumb-check{position:absolute;inset:0;background:rgba(46,125,50,.68);display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:700}

/* ══ SETTINGS ══════════════════════════════════════════════ */
.settings-2col{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:720px){.settings-2col{grid-template-columns:1fr}}
.ssc{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);overflow:hidden;margin-bottom:18px;box-shadow:var(--shadow)}
.ssc-hd{padding:13px 18px;background:var(--primary);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;gap:7px}
.ssc-bd{padding:18px}

/* Background swatches */
.bg-preset-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:7px;margin:13px 0}
.bg-swatch{width:38px;height:38px;border-radius:9px;cursor:pointer;border:3px solid transparent;transition:var(--tr);box-shadow:0 1px 7px rgba(0,0,0,.13);position:relative}
.bg-swatch:hover{transform:scale(1.13);box-shadow:0 3px 14px rgba(0,0,0,.22)}
.bg-swatch.selected{border-color:var(--primary);box-shadow:0 0 0 3px rgba(21,101,192,.22)}
.bg-swatch.selected::after{content:'✓';position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.95);font-size:16px;font-weight:700;text-shadow:0 1px 3px rgba(0,0,0,.45)}

/* BG preview */
.bg-preview-box{width:120px;aspect-ratio:3/4;border-radius:var(--r);border:2px solid var(--border);background:#4A90D9;background-size:cover;background-position:center;position:relative;overflow:hidden;box-shadow:var(--shadow)}
.bg-preview-person{position:absolute;bottom:0;left:50%;transform:translateX(-50%);font-size:60px;line-height:1;filter:drop-shadow(0 2px 6px rgba(0,0,0,.25));opacity:.85}

/* Color inputs */
.color-row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}
.color-picker-input{width:38px;height:38px;border-radius:9px;border:2px solid var(--border);cursor:pointer;padding:2px;background:none}
.color-hex-input{flex:1;min-width:110px;max-width:150px;padding:9px 13px;border:2px solid var(--border);border-radius:var(--r-sm);font-family:'DM Mono',monospace;font-size:13px;text-transform:uppercase;outline:none;transition:var(--tr)}
.color-hex-input:focus{border-color:var(--primary)}

/* Toggle */
.toggle-wrap{display:flex;align-items:flex-start;gap:12px;margin-bottom:12px}
.toggle-label-wrap .toggle-label{font-size:13px;font-weight:600}
.toggle-label-wrap .toggle-desc{font-size:11px;color:var(--text2);margin-top:2px}
.toggle-switch{position:relative;width:44px;height:24px;flex-shrink:0;margin-top:1px}
.toggle-switch input{opacity:0;width:0;height:0}
.toggle-slider{position:absolute;cursor:pointer;inset:0;background:var(--border);border-radius:24px;transition:.22s}
.toggle-slider::before{content:'';position:absolute;width:16px;height:16px;left:4px;top:4px;background:#fff;border-radius:50%;transition:.22s;box-shadow:0 1px 3px rgba(0,0,0,.18)}
input:checked + .toggle-slider{background:var(--success)}
input:checked + .toggle-slider::before{transform:translateX(20px)}

/* Range */
.range-wrap{display:flex;align-items:center;gap:11px}
.range-input{flex:1;-webkit-appearance:none;height:5px;border-radius:3px;background:var(--border);outline:none;cursor:pointer}
.range-input::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--primary);cursor:pointer;box-shadow:0 2px 5px rgba(21,101,192,.3)}
.range-value{font-size:12px;font-weight:700;color:var(--primary);min-width:38px;text-align:right;font-family:'DM Mono',monospace}

/* Settings rows */
.sr-row{display:flex;align-items:center;justify-content:space-between;padding:13px 18px;border-bottom:1px solid var(--border);gap:14px}
.sr-row:last-child{border-bottom:none}
.sr-label{font-size:13px;font-weight:600}.sr-desc{font-size:11px;color:var(--text2);margin-top:2px}
.sr-val{font-size:12px;color:var(--primary);font-family:'DM Mono',monospace;font-weight:500;text-align:right}

/* File upload button */
.file-upload-btn{position:relative;overflow:hidden;display:inline-flex}
.file-upload-btn input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%}

/* Kbd */
kbd{background:var(--bg);padding:2px 6px;border-radius:4px;border:1px solid var(--border);font-size:11px;font-family:'DM Mono',monospace}

@media(max-width:640px){
  .camera-layout{padding:12px}
  .page{padding:14px}
  .topbar{padding:0 12px}
  .nav-bar{padding:0 8px}
  .nav-tab{padding:11px 9px;font-size:11px;gap:4px}
}