@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#dbeafe;--success:#16a34a;--warning:#f59e0b;--danger:#dc2626;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-500:#6b7280;--gray-700:#374151;--gray-900:#111827;--radius:12px;--shadow:0 1px 3px rgba(0,0,0,.1);--shadow-lg:0 10px 25px rgba(0,0,0,.1)}
body{font-family:'Inter',sans-serif;background:var(--gray-50);color:var(--gray-900);line-height:1.6}
a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}
.navbar{background:#fff;border-bottom:1px solid var(--gray-200);padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:64px;position:sticky;top:0;z-index:100}
.nav-brand{font-size:1.25rem;font-weight:700;color:var(--primary)}
.nav-links{display:flex;gap:1.5rem;align-items:center}
.nav-links a{color:var(--gray-700);font-weight:500;font-size:.9rem}
.nav-user{display:flex;align-items:center;gap:.75rem}
.nav-avatar{width:36px;height:36px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:600}
.container{max-width:1200px;margin:0 auto;padding:2rem}
.container-sm{max-width:600px;margin:0 auto;padding:2rem}
.card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem;margin-bottom:1.5rem;border:1px solid var(--gray-200)}
.modules-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:1.5rem}
.module-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--gray-200);overflow:hidden;transition:.2s}
.module-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.module-header{padding:1.5rem;background:linear-gradient(135deg,var(--primary),#7c3aed);color:#fff}
.module-header .icon{font-size:2rem;margin-bottom:.5rem}
.module-header h3{font-size:1.1rem;margin:0}
.module-body{padding:1.5rem}
.module-body p{color:var(--gray-500);font-size:.9rem;margin-bottom:1rem}
.progress-bar{background:var(--gray-200);border-radius:999px;height:8px;overflow:hidden}
.progress-fill{background:linear-gradient(90deg,var(--primary),var(--success));height:100%;border-radius:999px;transition:width .5s}
.progress-text{font-size:.8rem;color:var(--gray-500);margin-top:.25rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.25rem;border:none;border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:.2s;text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);color:#fff}
.btn-success{background:var(--success);color:#fff}.btn-outline{background:transparent;border:1px solid var(--gray-300);color:var(--gray-700)}
.btn-outline:hover{background:var(--gray-100)}.btn-danger{background:var(--danger);color:#fff}
.btn-sm{padding:.4rem .75rem;font-size:.8rem}.btn-block{width:100%;justify-content:center}
.form-group{margin-bottom:1.25rem}.form-group label{display:block;font-weight:500;margin-bottom:.4rem;font-size:.9rem}
.form-control{width:100%;padding:.65rem .9rem;border:1px solid var(--gray-300);border-radius:8px;font-size:.9rem;font-family:inherit}
.form-control:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.alert{padding:.9rem 1.25rem;border-radius:8px;margin-bottom:1rem;font-size:.9rem}
.alert-success{background:#dcfce7;color:#166534;border:1px solid #bbf7d0}
.alert-danger{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.alert-info{background:var(--primary-light);color:#1e40af;border:1px solid #bfdbfe}
.alert-warning{background:#fef3c7;color:#92400e;border:1px solid #fde68a}
.lesson-content{line-height:1.8;font-size:1rem}
.lesson-content h3{margin:1.5rem 0 .75rem;font-size:1.25rem}
.lesson-content h4{margin:1rem 0 .5rem}
.lesson-content p{margin-bottom:.75rem}
.lesson-content ul,.lesson-content ol{margin:.75rem 0;padding-left:1.5rem}
.lesson-content li{margin-bottom:.4rem}
.info-box{background:var(--primary-light);border-left:4px solid var(--primary);padding:1rem 1.25rem;border-radius:0 8px 8px 0;margin:1rem 0}
.info-box h4{color:var(--primary-dark);margin-bottom:.5rem}
.task-box{background:#fef3c7;border-left:4px solid var(--warning);padding:1rem 1.25rem;border-radius:0 8px 8px 0;margin:1rem 0}
.task-box h4{color:#92400e;margin-bottom:.5rem}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem;margin:1rem 0}
.feature-card{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:8px;padding:1rem}
.feature-card h4{font-size:.95rem;margin-bottom:.4rem;color:var(--primary-dark)}
.feature-card p{font-size:.85rem;margin:0;color:var(--gray-700)}
.model-card{border-radius:8px;padding:1.25rem;margin-bottom:1rem;color:#fff}
.model-card.iaas{background:linear-gradient(135deg,#0ea5e9,#0284c7)}
.model-card.paas{background:linear-gradient(135deg,#8b5cf6,#7c3aed)}
.model-card.saas{background:linear-gradient(135deg,#10b981,#059669)}
.model-card h4{margin-bottom:.5rem}.model-card p{margin-bottom:.4rem;font-size:.9rem}
.styled-table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.9rem}
.styled-table th,.styled-table td{padding:.6rem .8rem;border:1px solid var(--gray-200);text-align:left}
.styled-table th{background:var(--gray-100);font-weight:600}
.video-container{position:relative;padding-bottom:56.25%;height:0;margin:1.5rem 0;border-radius:var(--radius);overflow:hidden}
.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}
.question-card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius);padding:1.5rem;margin-bottom:1.25rem}
.question-num{font-size:.8rem;color:var(--primary);font-weight:600;text-transform:uppercase;margin-bottom:.5rem}
.question-text{font-size:1.05rem;font-weight:500;margin-bottom:1rem}
.options label{display:flex;align-items:flex-start;gap:.75rem;padding:.65rem .9rem;border:1px solid var(--gray-200);border-radius:8px;margin-bottom:.5rem;cursor:pointer;transition:.15s;font-size:.9rem}
.options label:hover{background:var(--primary-light);border-color:var(--primary)}
.options input[type="radio"]{margin-top:.2rem;accent-color:var(--primary)}
.timer{background:var(--gray-900);color:#fff;padding:.5rem 1rem;border-radius:8px;font-weight:600;font-size:1.1rem}
.result-circle{width:140px;height:140px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 1.5rem;font-size:2rem;font-weight:700}
.result-pass{background:#dcfce7;color:var(--success);border:4px solid var(--success)}
.result-fail{background:#fef2f2;color:var(--danger);border:4px solid var(--danger)}
.result-circle small{font-size:.8rem;font-weight:400}
.layout-sidebar{display:grid;grid-template-columns:280px 1fr;gap:2rem}
.sidebar{position:sticky;top:80px;align-self:start}
.sidebar-item{display:flex;align-items:center;gap:.75rem;padding:.85rem 1.25rem;border-bottom:1px solid var(--gray-100);font-size:.9rem;color:var(--gray-700);transition:.15s}
.sidebar-item:hover{background:var(--gray-50);color:var(--primary)}
.sidebar-item.active{background:var(--primary-light);color:var(--primary);font-weight:500;border-left:3px solid var(--primary)}
.sidebar-item.completed{color:var(--success)}
.sidebar-item .check{color:var(--success);font-weight:700}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;margin-bottom:2rem}
.stat-card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius);padding:1.25rem;text-align:center}
.stat-card .stat-num{font-size:2rem;font-weight:700;color:var(--primary)}
.stat-card .stat-label{font-size:.85rem;color:var(--gray-500);margin-top:.25rem}
.data-table{width:100%;border-collapse:collapse;font-size:.9rem}
.data-table th,.data-table td{padding:.7rem .9rem;text-align:left;border-bottom:1px solid var(--gray-200)}
.data-table th{background:var(--gray-50);font-weight:600;color:var(--gray-700);font-size:.8rem;text-transform:uppercase}
.data-table tr:hover{background:var(--gray-50)}
.badge{display:inline-block;padding:.2rem .6rem;border-radius:999px;font-size:.75rem;font-weight:500}
.badge-success{background:#dcfce7;color:#166534}.badge-warning{background:#fef3c7;color:#92400e}
.badge-danger{background:#fef2f2;color:#991b1b}.badge-info{background:var(--primary-light);color:#1e40af}
.hero{background:linear-gradient(135deg,#1e3a8a,#7c3aed);color:#fff;padding:4rem 2rem;text-align:center}
.hero h1{font-size:2.5rem;font-weight:700;margin-bottom:1rem}
.hero p{font-size:1.15rem;opacity:.9;max-width:700px;margin:0 auto 2rem}
.lesson-nav{display:flex;justify-content:space-between;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--gray-200)}
@media(max-width:768px){.navbar{padding:0 1rem}.modules-grid{grid-template-columns:1fr}.layout-sidebar{grid-template-columns:1fr}.sidebar{position:static}.stats-grid{grid-template-columns:repeat(2,1fr)}.hero h1{font-size:1.75rem}.feature-grid{grid-template-columns:1fr}}