/* základní nastavení */
        * {
            box-sizing: border-box;
            margin: 0px;
            padding: 0px;
        }

        /* body */
        body {
            font-family: 'Inter', sans-serif;
            background-color: #121212;
            color: #d3d3d3;
            width: 100vw;
            height: 100vh;
            overflow: hidden;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ikony */
        .material-symbols-rounded {
            font-variation-settings:
            'FILL' 0,
            'wght' 400,
            'GRAD' 0,
            'opsz' 24;
            font-size: 24px;
        }

        /* dynamické pozadí */
        .ambient-bg {
            position: absolute;
            top: 0px;
            left: 0px;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: -1;
            background-image: radial-gradient(circle at 10% 20%, #e2007414 20%, transparent 100%),
                              radial-gradient(circle at 100% 100%, #ffffff05 0%, transparent 40%);
        }

        /* login wrapper a slider */
        .login-wrapper {
            width: 100%;
            max-width: 420px;
            position: relative;
            z-index: 10;
        }

        /* tekuté sklo (box) */
        .liquid-glass-box {
            background: linear-gradient(135deg, #ffffff11 0%, #ffffff03 100%);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border: 1px solid #ffffff1a;
            border-top: 1px solid #ffffff33;
            border-left: 1px solid #ffffff33;
            box-shadow: 0px 16px 40px #00000066, inset 0px 0px 10px #ffffff0a;
            border-radius: 24px;
            overflow: hidden;
            position: relative;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .slider-container {
            display: flex;
            width: 200%;
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* panel pro každý obraz */
        .panel {
            width: 50%;
            padding: 40px;
            display: flex;
            flex-direction: column;
        }

        /* animace otřesu a blikání chyby */
        @keyframes shake {
            0%, 100% { transform: translateX(0px); }
            20%, 60% { transform: translateX(-10px); }
            40%, 80% { transform: translateX(10px); }
        }
        
        @keyframes blinkBorder {
            0%, 100% { border-color: #ffffff1a; box-shadow: 0px 16px 40px #00000066, inset 0px 0px 10px #ffffff0a; }
            50% { border-color: #e20074; box-shadow: 0px 16px 40px #00000066, inset 0px 0px 20px #e2007466, 0px 0px 15px #e20074; }
        }

        .error-shake {
            animation: shake 0.5s ease-in-out, blinkBorder 0.5s ease-in-out 2;
            border-color: #e20074 !important;
        }

        /* logo */
        .brand-logo {
            font-family: 'Saira Stencil', sans-serif;
            font-family: 'Saira Stencil One', sans-serif;
            font-size: 32px;
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 10px;
        }

        .brand-logo .material-symbols-rounded {
            color: #ffffff;
            font-size: 42px;
            margin-right: 12px;
        }

        .logo-jl {
            color: #e20074;
            font-size: 42px;
        }

        .logo-coach {
            font-size: 32px;
        }

        .login-title {
            text-align: center;
            font-size: 15px;
            color: #a0a0a0;
            margin-bottom: 30px;
            font-weight: 400;
        }

        .highlight-text {
            color: #e20074;
            font-weight: 500;
        }

        /* inputy */
        .input-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-bottom: 20px;
            position: relative;
        }

        .input-header {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
        }

        .input-group label {
            font-size: 13px;
            color: #d3d3d3;
            margin-left: 4px;
        }

        .input-group input {
            background: #ffffff0a;
            border: 1px solid #ffffff1a;
            border-radius: 12px;
            padding: 12px 15px;
            color: #ffffff;
            font-family: 'Inter', sans-serif;
            font-size: 14px;
            outline: none;
            transition: all 0.3s ease;
            width: 100%;
        }

        .input-group input:focus {
            border-color: #e20074;
            background: #ffffff14;
        }

        /* ikona viditelnosti hesla */
        .icon-visibility {
            position: absolute;
            right: 15px;
            top: 36px;
            color: #a0a0a0;
            cursor: pointer;
            font-size: 20px !important;
            transition: color 0.2s ease;
        }

        .icon-visibility:hover {
            color: #ffffff;
        }

        /* odkaz zapomenuté heslo */
        .forgot-link {
            color: #a0a0a0;
            font-size: 12px;
            text-decoration: none;
            position: relative;
            cursor: pointer;
            padding-bottom: 2px;
        }

        .forgot-link::after {
            content: '';
            position: absolute;
            bottom: 0px;
            left: 0px;
            width: 0%;
            height: 1px;
            background-color: #e20074;
            transition: width 0.3s ease;
        }

        .forgot-link:hover {
            color: #e20074;
        }

        .forgot-link:hover::after {
            width: 100%;
        }

        /* checkbox */
        .checkbox-container {
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
            font-size: 13px;
            color: #a0a0a0;
            margin-bottom: 25px;
            user-select: none;
        }

        .checkbox-container input {
            display: none;
        }

        .custom-checkbox {
            width: 22px;
            height: 22px;
            border-radius: 6px;
            background: #ffffff0a;
            border: 1px solid #ffffff1a;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
            flex-shrink: 0;
        }

        .checkbox-container input:checked + .custom-checkbox {
            background: linear-gradient(135deg, #e20074 0%, #b2005b 100%);
            border-color: #ff33994d;
            box-shadow: 0px 2px 8px #e2007466;
        }

        .custom-checkbox .material-symbols-rounded {
            font-size: 16px !important;
            color: #ffffff;
            opacity: 0;
            transform: scale(0);
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .checkbox-container input:checked + .custom-checkbox .material-symbols-rounded {
            opacity: 1;
            transform: scale(1);
        }

        /* tlačítko login / odeslat */
        .btn-submit {
            background: linear-gradient(135deg, #e2007433 0%, #ffffff05 100%);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border: 1px solid #e200744d;
            border-top: 1px solid #e2007480;
            border-left: 1px solid #e200744d;
            box-shadow: 0px 4px 15px #0000004d, inset 0px 0px 15px #e200741a;
            color: #ffffff;
            padding: 14px;
            border-radius: 14px;
            font-family: 'Inter', sans-serif;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            outline: none;
            width: 100%;
        }

        .btn-submit:hover {
            background: linear-gradient(135deg, #e200744d 0%, #ffffff1a 100%);
            box-shadow: 0px 6px 20px #e200744d, inset 0px 0px 20px #e2007433;
            transform: translateY(-2px);
        }

        /* loading animace tlačítka */
        .btn-submit.loading {
            pointer-events: none;
        }

        .btn-submit.loading .material-symbols-rounded {
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            100% { transform: rotate(360deg); }
        }

        /* tlačítko po úspěchu */
        .btn-submit.success {
            background: linear-gradient(135deg, #39ff1433 0%, #ffffff05 100%) !important;
            border-color: #39ff144d !important;
            border-top-color: #39ff1480 !important;
            border-left-color: #39ff144d !important;
            box-shadow: 0px 4px 15px #0000004d, inset 0px 0px 15px #39ff1433 !important;
            pointer-events: none;
            color: #ffffff;
        }

        /* návrat zpět */
        .back-link-container {
            margin-top: 20px;
            text-align: center;
        }

        .back-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }