:root{--primary:#2563eb;--primary-dark:#1e40af;--primary-soft:#dbeafe;--cyan:#06b6d4;--green:#16a34a;--red:#dc2626;--orange:#f59e0b;--text:#334155;--text-dark:#0f172a;--text-muted:#64748b;--bg:#f5f7fb;--card:#fff;--border:#e5e7eb;--input-border:#dbe3ef;--shadow:0 18px 45px #0f172a14;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,Arial,system-ui,sans-serif}*{box-sizing:border-box}body{background:var(--bg);margin:0}button,input,select,textarea{font-family:inherit}#app{box-sizing:border-box;width:100%;max-width:100%;min-height:100vh}.teacher-page{min-height:100vh;color:var(--text-dark);background:radial-gradient(circle at 0 0,#2563eb29,#0000 34%),radial-gradient(circle at 100% 0,#06b6d429,#0000 34%),linear-gradient(135deg,#eef2ff 0%,#f8fafc 45%,#ecfeff 100%);padding:28px}.teacher-wrap{max-width:1180px;margin:0 auto}.teacher-hero{color:#fff;background:linear-gradient(135deg,#1e3a8a,#2563eb,#06b6d4);border-radius:28px;justify-content:space-between;align-items:center;gap:18px;margin-bottom:22px;padding:28px;display:flex;box-shadow:0 22px 50px #2563eb38}.teacher-hero-left{align-items:center;gap:18px;display:flex}.teacher-hero h1{letter-spacing:-.5px;color:#fff;margin:0;font-size:30px}.teacher-hero p{color:#dbeafe;margin:8px 0 0;line-height:1.5}.teacher-avatar{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffff2e;border:1px solid #ffffff59;border-radius:24px;flex-shrink:0;place-items:center;width:72px;height:72px;font-size:34px;display:grid}.logout-modern{color:#fff;cursor:pointer;background:#ffffff29;border:1px solid #ffffff52;border-radius:14px;padding:11px 16px;font-weight:700;transition:all .2s}.logout-modern:hover{background:#ffffff3d;transform:translateY(-1px)}.teacher-grid{grid-template-columns:340px 1fr;align-items:start;gap:22px;display:grid}.modern-card{box-shadow:var(--shadow);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#ffffffe0;border:1px solid #e2e8f0e6;border-radius:24px;overflow:hidden}.modern-card-body{padding:22px}.card-title{color:var(--text-dark);letter-spacing:-.2px;margin:0;font-size:20px;font-weight:800}.card-subtitle{color:var(--text-muted);margin:6px 0 18px;font-size:14px;line-height:1.5}.profile-top{text-align:center;background:linear-gradient(135deg,#eff6ff,#ecfeff);border-bottom:1px solid #e2e8f0;padding:24px 20px}.profile-icon{color:#fff;background:linear-gradient(135deg,#2563eb,#06b6d4);border-radius:28px;place-items:center;width:82px;height:82px;margin:0 auto 12px;font-size:36px;display:grid;box-shadow:0 15px 30px #2563eb40}.profile-name{color:var(--text-dark);margin-bottom:4px;font-size:19px;font-weight:800}.profile-id{color:var(--text-muted);font-size:13px}.info-row{border-bottom:1px solid #f1f5f9;justify-content:space-between;gap:16px;padding:13px 0;display:flex}.info-row:last-child{border-bottom:none}.info-label{color:var(--text-muted);font-size:13px}.info-value{text-align:right;color:var(--text-dark);word-break:break-word;max-width:180px;font-weight:700}.badge-soft{background:var(--primary-soft);color:#1d4ed8;border-radius:999px;align-items:center;gap:6px;padding:7px 11px;font-size:12px;font-weight:800;display:inline-flex}.form-grid-modern{grid-template-columns:repeat(2,minmax(240px,1fr));gap:16px;display:grid}.field-full{grid-column:1/-1}.modern-label{color:#334155;margin-bottom:7px;font-size:13px;font-weight:800;display:block}.modern-input,.modern-select,.modern-textarea{border:1px solid var(--input-border);width:100%;color:var(--text-dark);background:#fff;border-radius:15px;outline:none;padding:13px 14px;font-size:14px;transition:all .2s}.modern-input:focus,.modern-select:focus,.modern-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 4px #2563eb1f}.modern-input[readonly]{color:#475569;background:#f8fafc}.modern-textarea{resize:vertical;min-height:110px}.btn-primary-modern{color:#fff;cursor:pointer;background:linear-gradient(135deg,#2563eb,#06b6d4);border:none;border-radius:15px;padding:13px 18px;font-weight:800;transition:all .2s;box-shadow:0 12px 24px #2563eb38}.btn-primary-modern:hover{transform:translateY(-1px);box-shadow:0 16px 28px #2563eb47}.btn-primary-modern:disabled{opacity:.65;cursor:not-allowed;transform:none}.btn-secondary-modern{color:var(--text-dark);cursor:pointer;background:#e2e8f0;border:none;border-radius:15px;padding:13px 18px;font-weight:800;transition:all .2s}.btn-secondary-modern:hover{background:#cbd5e1}.student-dropdown{z-index:20;background:#fff;border:1px solid #e5e7eb;border-radius:18px;display:none;position:absolute;top:78px;left:0;right:0;overflow:hidden;box-shadow:0 18px 40px #0f172a29}.student-option-modern,.student-option{text-align:left;cursor:pointer;background:#fff;border:none;border-bottom:1px solid #f1f5f9;width:100%;padding:14px;transition:all .15s}.student-option-modern:hover,.student-option:hover{background:#eff6ff}.history-box{border-top:1px solid #e5e7eb;margin-top:24px;padding-top:22px}.history-filter{grid-template-columns:repeat(5,minmax(130px,1fr));gap:12px;margin-bottom:14px;display:grid}.history-table-wrap{background:#fff;border:1px solid #e5e7eb;border-radius:18px;overflow:auto}.history-table{border-collapse:collapse;width:100%;min-width:920px}.history-table th{text-align:left;color:#475569;white-space:nowrap;background:#f8fafc;border-bottom:1px solid #e5e7eb;padding:13px;font-size:13px}.history-table td{vertical-align:top;border-bottom:1px solid #f1f5f9;padding:13px;font-size:14px}.status-badge{border-radius:999px;padding:6px 10px;font-size:12px;font-weight:800;display:inline-flex}.status-success{color:#166534;background:#dcfce7}.status-danger{color:#991b1b;background:#fee2e2}.alert-success{color:#166534;background:#dcfce7;border-radius:12px;padding:12px;font-weight:800}.alert-danger{color:#991b1b;background:#fee2e2;border-radius:12px;padding:12px;font-weight:800}.empty-state{text-align:center;color:var(--text-muted);background:#f8fafc;border:1px dashed #cbd5e1;border-radius:12px;padding:18px}@media (width<=900px){.teacher-page{padding:18px}.teacher-grid,.form-grid-modern,.history-filter{grid-template-columns:1fr}.teacher-hero{flex-direction:column;align-items:flex-start}.teacher-hero-left{align-items:flex-start}.teacher-hero h1{font-size:25px}.teacher-avatar{border-radius:20px;width:60px;height:60px;font-size:28px}}@media (width<=520px){.teacher-page{padding:12px}.teacher-hero{border-radius:22px;padding:20px}.teacher-hero-left{flex-direction:column}.modern-card{border-radius:20px}.modern-card-body{padding:18px}}