:root{color-scheme:light}html[data-theme="dark"]{color-scheme:dark;--bg:#0e171f;--card:#182631;--text:#e6eef4;--muted:#a7b7c2;--border:#344957;--navy:#e6eef4;--blue:#78b9e8;--teal:#65c9be;--gold:#e3b45b;--danger:#ff9ea7;--success:#70d2aa;--shadow:0 12px 32px rgba(0,0,0,.28)}
html[data-theme="dark"] body{background:var(--bg);color:var(--text)}html[data-theme="dark"] .site-header{background:#091119;color:var(--text)}html[data-theme="dark"] .site-footer{background:#111e28;color:var(--muted)}html[data-theme="dark"] .brand,.dark .brand{color:var(--text)}html[data-theme="dark"] .main-nav a{color:#dce9f1}html[data-theme="dark"] .portal-card,html[data-theme="dark"] .auth-card,html[data-theme="dark"] .notice-card,html[data-theme="dark"] .student-card,html[data-theme="dark"] .section-card,html[data-theme="dark"] .stat-card,html[data-theme="dark"] .table-card,html[data-theme="dark"] .form-shell,html[data-theme="dark"] .detail-section{background:var(--card);border-color:var(--border);box-shadow:var(--shadow)}html[data-theme="dark"] h1,html[data-theme="dark"] h2,html[data-theme="dark"] h3,html[data-theme="dark"] .portal-card h2,html[data-theme="dark"] .student-card h2{color:var(--text)}html[data-theme="dark"] input,html[data-theme="dark"] select,html[data-theme="dark"] textarea{background:#101c25;color:var(--text);border-color:var(--border)}html[data-theme="dark"] .data-table th{background:#10202b;color:var(--text)}html[data-theme="dark"] .data-table td{border-color:var(--border)}html[data-theme="dark"] .readonly-value{background:#22343f;color:var(--muted)}html[data-theme="dark"] .button.secondary{background:#22343f;color:var(--text);border-color:var(--border)}html[data-theme="dark"] .privacy-note,html[data-theme="dark"] .alert{background:#20343d;color:var(--text)}html[data-theme="dark"] .alert.error{background:#492b34;color:#ffd7da}html[data-theme="dark"] .alert.success{background:#1f453b;color:#c9f6e2}html[data-theme="dark"] .progress{background:#2a3a45}html[data-theme="dark"] .theme-menu{background:#182631;border-color:var(--border)}html[data-theme="dark"] .theme-menu button{color:var(--text)}html[data-theme="dark"] .theme-menu button:hover{background:#263b49}
.theme-picker{position:relative;margin-left:auto}.theme-toggle{min-height:36px;border:1px solid rgba(255,255,255,.35);background:transparent;color:inherit;border-radius:8px;padding:6px 10px;cursor:pointer}.theme-menu{position:absolute;right:0;top:44px;z-index:30;background:#fff;border:1px solid var(--border);border-radius:9px;box-shadow:var(--shadow);padding:5px;min-width:125px}.theme-menu button{display:block;width:100%;text-align:left;border:0;background:transparent;color:var(--text);padding:8px 10px;border-radius:6px;cursor:pointer;font:inherit}.theme-menu button:hover,.theme-menu button[aria-pressed="true"]{background:#e8f2f6}.theme-menu button[aria-pressed="true"]{font-weight:800}
html[data-theme="dark"] .theme-menu button:hover{background:#294351;color:#f4fbff}html[data-theme="dark"] .theme-menu button[aria-pressed="true"]{background:#65c9be;color:#071318;font-weight:800;box-shadow:inset 0 0 0 2px #b5fff4}html[data-theme="dark"] .theme-menu button[aria-pressed="true"]:focus-visible{outline:3px solid #f4fbff;outline-offset:1px}
html[data-theme="dark"] .student-identity-header{background:#1d3540;border-color:#41616d;color:#eefaff}html[data-theme="dark"] .identity-name,html[data-theme="dark"] .identity-meta,html[data-theme="dark"] .identity-hint{color:#eefaff}html[data-theme="dark"] .checkbox-row{background:#203642;color:#eefaff;border:1px solid #41616d}html[data-theme="dark"] .code-box{background:#203d42;color:#effffb;border-color:#65c9be}html[data-theme="dark"] .question-row{border-color:#344957}html[data-theme="dark"] .answer-item{border-color:#344957}html[data-theme="dark"] .class-pill{background:#294957;color:#dffbf6}html[data-theme="dark"] input::placeholder,html[data-theme="dark"] textarea::placeholder{color:#9fb1bd;opacity:1}html[data-theme="dark"] input:disabled,html[data-theme="dark"] select:disabled,html[data-theme="dark"] textarea:disabled{background:#22343f;color:#a7b7c2}html[data-theme="dark"] .help{color:#b5c5ce}html[data-theme="dark"] .field-error{background:#492b34;color:#ffd7da}html[data-theme="dark"] .student-card-top a{color:var(--text)}
@media print{html[data-theme="dark"]{color-scheme:light;--bg:#fff;--card:#fff;--text:#111;--muted:#444;--border:#bbb;--navy:#111;--shadow:none}html[data-theme="dark"] body,html[data-theme="dark"] .detail-section,html[data-theme="dark"] .table-card{background:#fff;color:#111}.theme-picker{display:none!important}}
@media (prefers-reduced-motion: reduce){.progress span{transition:none!important}}