:root{--primary-color: #8B7355;--primary-dark: #5D4037;--primary-light: #A9927D;--accent-gold: #C5A065;--success-color: #4E6E58;--error-color: #8B3A3A;--text-primary: #3E2723;--text-secondary: #795548;--bg-primary: #FFFFFF;--bg-secondary: #F9F7F2;--bg-body: #EFEBE9;--border-color: #D7CCC8;--shadow: 0 10px 30px -10px rgba(62, 39, 35, .15);--shadow-sm: 0 1px 2px 0 rgba(62, 39, 35, .05);--transition: all .3s ease;--radius-sm: 2px;--radius-md: 4px;--radius-lg: 6px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,Helvetica Neue,Helvetica,Arial,sans-serif;background:linear-gradient(135deg,#f5f0eb,#e0d6cc);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;color:var(--text-primary);line-height:1.6}.container{width:100%;max-width:420px}.auth-card{background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:48px 40px;animation:slideUp .6s cubic-bezier(.22,1,.36,1);border-top:4px solid var(--primary-color)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.logo{text-align:center;margin-bottom:36px}.logo h1{font-size:28px;font-weight:600;color:var(--primary-dark);letter-spacing:.5px;margin-bottom:8px;text-transform:uppercase}.logo p{color:var(--text-secondary);font-size:13px;letter-spacing:.5px;text-transform:uppercase}.form-group{margin-bottom:24px}label{display:block;margin-bottom:8px;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary)}input{width:100%;padding:14px 16px;border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:15px;transition:var(--transition);font-family:inherit;background:var(--bg-secondary);color:var(--text-primary)}input:focus{outline:none;border-color:var(--primary-color);background:#fff;box-shadow:0 0 0 1px var(--primary-color)}input::placeholder{color:#bcaaa4}.btn{width:100%;padding:16px;border:none;border-radius:var(--radius-md);font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:1px;cursor:pointer;transition:var(--transition);font-family:inherit;position:relative;overflow:hidden}.btn-primary{background:var(--primary-color);color:#fff;box-shadow:0 4px 10px #8b735533}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 15px #8b73554d}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:transparent;color:var(--text-secondary);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--primary-light);color:var(--primary-dark)}.btn:disabled{opacity:.7;cursor:not-allowed;transform:none!important;background:#d7ccc8}.toggle-form{text-align:center;margin-top:30px;font-size:13px;color:var(--text-secondary)}.toggle-form a{color:var(--primary-color);text-decoration:none;font-weight:600;transition:var(--transition);border-bottom:1px solid transparent}.toggle-form a:hover{color:var(--primary-dark);border-bottom-color:var(--primary-dark)}.alert{padding:14px 16px;border-radius:var(--radius-md);margin-bottom:24px;font-size:13px;line-height:1.5;animation:slideDown .4s ease-out;border-left:4px solid transparent}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.alert-error{background:#ffebee;color:var(--error-color);border-left-color:var(--error-color)}.alert-success{background:#e8f5e9;color:var(--success-color);border-left-color:var(--success-color)}.alert-info{background:#efebe9;color:var(--primary-dark);border-left-color:var(--primary-color)}.hidden{display:none!important}.dashboard{width:100%;text-align:left;background:#fff;min-height:100vh;position:absolute;top:0;left:0;z-index:10;padding-top:60px}.navbar{background:#3e2723;border-bottom:none;padding:0 24px;position:fixed;top:0;left:0;width:100%;z-index:100;height:50px;display:flex;align-items:center}.nav-content{width:100%;max-width:100%;height:100%;display:flex;align-items:center;justify-content:flex-start;gap:30px}.nav-user{display:flex;align-items:center;gap:6px;color:#ccc;font-size:14px;cursor:pointer;margin-right:10px}#navUserName{color:#ccc;font-weight:400}.dropdown-arrow{font-size:10px;color:#999}.nav-links{display:flex;gap:24px}.nav-link{color:#ccc;text-decoration:none;font-size:14px;font-weight:400;padding:0;border:none;transition:color .2s;text-transform:lowercase}.nav-link:hover,.nav-link.active{color:#fff;border:none}.nav-right{margin-left:auto}.hero-section{display:none}.course-container{width:65%;max-width:1000px;margin:40px auto;padding:0}.course-grid{display:flex;flex-direction:column;gap:0}.course-card{background:transparent;border-radius:0;box-shadow:none;border:none;border-bottom:1px solid #ccc;display:flex;flex-direction:row;padding:20px 0;min-height:160px;position:relative}.course-card:hover{transform:none;box-shadow:none;border-color:#ccc}.course-thumbnail{width:240px;height:135px;flex-shrink:0;margin-right:20px;background:#000;position:relative;padding-top:0}.course-thumbnail img{width:100%;height:100%;object-fit:cover}.play-icon{width:40px;height:40px;font-size:16px;background:red;border:none;border-radius:10px;opacity:.9}.course-card:hover .play-icon{background:red;opacity:1;border:none}.course-content{padding:0;flex:1;display:flex;flex-direction:column;position:relative}.course-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:4px}.course-title{font-size:14px;font-weight:700;color:#36c;margin:0;cursor:pointer}.course-title:hover{text-decoration:underline}.course-meta-top{font-size:11px;color:#999}.course-instructor{font-size:11px;color:#36c;text-align:right}.course-description{font-size:13px;color:#333;margin-top:8px;line-height:1.4;max-width:90%}.course-actions{position:absolute;bottom:0;right:0;display:flex;gap:6px}.btn-action{background:#fcfcfc;border:1px solid #ccc;border-radius:3px;padding:2px 8px;font-size:11px;color:#36c;cursor:pointer;display:flex;align-items:center;gap:4px;box-shadow:0 1px 2px #0000000d;background:linear-gradient(to bottom,#fff,#f0f0f0)}.btn-action:hover{background:#e6e6e6}.btn-action i{font-style:normal}@media(max-width:768px){.course-container{width:95%}.course-card{flex-direction:column}.course-thumbnail{width:100%;height:auto;aspect-ratio:16/9;margin-bottom:12px}.course-actions{position:relative;margin-top:16px;justify-content:flex-end}}.loading{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.4);border-radius:50%;border-top-color:#fff;animation:spin .8s linear infinite;margin-right:10px;vertical-align:middle}@keyframes spin{to{transform:rotate(360deg)}}.password-requirements{font-size:12px;color:var(--text-secondary);margin-top:12px;padding:16px;background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border-color)}.password-requirements ul{margin-left:20px;margin-top:8px}.password-requirements li{margin:4px 0}@media(max-width:480px){.auth-card{padding:32px 24px}.logo h1{font-size:24px}.btn-group{flex-direction:column}}